Answers
Answer:
A scientific problem is often discovered when an observation is made, which leads to a question.
A hypothesis is formed when an explanation is proposed for an observation.
Testing a proposed explanation requires designing an experiment.
For the results of the experiment to be accepted, the experiment must produce the same results when repeated.
An explanation may become a theory if the same results are found after many tests.
Related Questions
calculate the ph for an aqueous solution of ammonia that contains 2.15 × 10-4 m hydroxide ion.
Answers
The pH for an aqueous solution of ammonia that contains 2.15 × 10⁻⁴ m hydroxide ion is 11.67.
To calculate the pH for an aqueous solution of ammonia that contains 2.15 × 10⁻⁴ M hydroxide ion, one needs to use the Kb value of ammonia.
Kb value of ammonia is:
Kb = [NH₄⁺][OH⁻] / [NH₃]
Here, we know the concentration of hydroxide ion:
[OH⁻] = 2.15 × 10-4 M
We can use the relationship between [H⁺] and [OH⁻] to calculate the concentration of hydrogen ion:
Kw = [H⁺][OH⁻]1.0 × 10⁻¹⁴
= [H⁺] (2.15 × 10⁻⁴)[H⁺]
= 4.65 × 10⁻¹¹ M
We know that [NH₄⁺] = [OH⁻] and [NH₃] is the concentration of the unreacted ammonia:
[NH₃] = [NH₄⁺] = [OH⁻] = 2.15 × 10⁻⁴M
Kb = [NH₄⁺][OH⁻] / [NH₃]
Kb = (2.15 × 10⁻⁴)² / (2.15 × 10⁻⁴)
Kb = 2.15 × 10⁻⁴p
Kb = - log(Kb)
pKb = - log(2.15 × 10⁻⁴)
pKb = 3.67
At 25°C, the value of pKw = 14.00
pH + pOH = pKw
= 14.00pH + (- log[OH⁻])
= 14.00pH = 14.00 - (- log[OH⁻])
pH = 14.00 - (- log(2.15 × 10⁻⁴))
pH = 11.67
Hence, the pH of the given solution is 11.67.
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give the ground state complete electron configuration for the ion of ba
Answers
The ground state electronic configuration for Ba is [Xe]6s²
The electronic configuration is given to each and every element of the periodic table and with the help of this configuration by counting the number of electrons in the series we can predict the position of the element in the periodic table in ground state.
Every element of periodic table have his own electronic configuration
but for exited state it can change on the basis of removal of electrons.
Therefore, the electronic configuration of barium, which is represented by Ba and has atomic number 56 at ground state will be [Xe]6s² .
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The reaction system CO(g) + 2 H2(g) = CH3OH(g) is at equilibrium. When H2 is added to the container, the reaction shifts to the right the partial pressure of Co does not change and the partial pressure of CH3OH decreases
Answers
The reaction system CO(g) + 2 H2(g) = CH3OH(g) is at equilibrium, meaning that the rate of the forward reaction is equal to the rate of the reverse reaction. If H2 is added to the container, the forward reaction becomes favoured and shifts to the right. This increases the amount of products (CH3OH) formed, and decreases the amount of reactants (CO and H2). As a result, the partial pressure of CO remains the same, while the partial pressure of CH3OH decreases.
This is due to Le Chatelier's Principle, which states that when a system at equilibrium is subjected to an external stress, the system will adjust to minimize the stress. In this case, the stress is the addition of H2, which is favouring the formation of products and disrupting the equilibrium. The system responds by decreasing the amount of products formed and shifting the reaction back to equilibrium.
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a hypothetical radioactive isotope has a half-life of 100,000 years. if the ratio of radioactive parent to stable daughter product is 1:7, how old is the rock containing the radioactive material? (unit can't be included, so give number that would match the unit of years)
Answers
A hypothetical radioactive isotope has a half-life of 100,000 years. if the ratio of radioactive parent to stable daughter product is 1:7, the rock containing the radioactive material old is 3 × 10⁵ .
given that , ratio of radioactive parent to stable daughter product is 1:7.
No / N = 1/ 1+ 7
therefore , N / No = 1 / 8
the half-life = 1 × 10⁵ yrs
by using the expression give as :
0.693 / 1 × 10⁵ t = 2.303 log No / N
0.693 / 1 × 10⁵ t = 2.302 log 8
0.693 t = 2.303 × 0.903 × 10⁵
0.693 t = 2.079 × 10⁵
t = (2.079 / 0.693 ) × 10⁵
t = 3 × 10⁵ yr old.
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Oxidation involves the ____ of electrons a. gain
b. loss
c. displacement
d. bending
Answers
Oxidation involves the loss of electrons. Option B is correct.
Oxidation is a chemical process which involves the loss of electrons by a substance or atom. It is characterized by an increase in the oxidation state or oxidation number of an atom, ion, or molecule. Oxidation can occur through a variety of chemical reactions, such as combustion, reaction with an oxidizing agent, or electron transfer.
In oxidation, the substance that loses electrons is called the reducing agent or reductant, as it causes the reduction (gain of electrons) of another substance. Conversely, the substance that gains electrons is called the oxidizing agent or oxidant, as it causes the oxidation (loss of electrons) of another substance.
Hence, B. is the correct option.
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in most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of
Answers
In most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of dislocation motion.
The dislocation motion plays the important role in the plastic deformation. The plastic deformation occurs when a material will be stress. The resulting plastic deformation is the permanent change. this permanent change is cannot be recovered by the removing the the stress that caused the deformation. the plastic deformation caused by the dislocation motion. dislocation motion, atoms in metals to side readily.
Thus, the plastic deformations is caused by the dislocation motion. this plastic deformation is the permanent change and not be removed by the simply removing the stress.
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what's the answerrr?? :)
Magnesium ribbon reacts with dilute hydrochloric acid. Explain how altering the concentration of the hydrochloric acid alters the rate of the reaction???? (3 marks)
Answers
Explanation:
The reaction between magnesium ribbon and dilute hydrochloric acid is a classic example of a single replacement reaction, which can be represented by the following chemical equation:
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).
The rate of this reaction can be altered by changing the concentration of the hydrochloric acid. This is because the rate of a chemical reaction depends on the concentration of the reactants. Specifically, the rate of the reaction is proportional to the concentration of the reactants raised to some power, which is determined by the reaction's rate law.
In this reaction, the rate law can be expressed as:
Rate = k [Mg] [HCl]^x
Where k is the rate constant and x is the order of the reaction with respect to hydrochloric acid. The order of the reaction with respect to magnesium is one, since the concentration of magnesium does not change during the reaction.
When the concentration of hydrochloric acid is increased, the rate of the reaction increases because there are more hydrochloric acid molecules available to collide with magnesium atoms and react. This means that the value of x is greater than zero and the reaction is dependent on the concentration of hydrochloric acid.
Conversely, when the concentration of hydrochloric acid is decreased, the rate of the reaction decreases because there are fewer hydrochloric acid molecules available to react with magnesium. This means that the value of x is less than one and the reaction is not entirely dependent on the concentration of hydrochloric acid.
how many unpaired electrons are in the cobalt atom?
Answers
Cobalt atom (Co) has one (1) unpaired electron in ground state.
How many unpaired electrons are in the cobalt atom?The cobalt atom (Co) has multiple oxidation states, which means it can have different numbers of unpaired electrons depending on its charge.
In its neutral state (Co⁰), cobalt has a total of 27 electrons.
If we split the 27 electrons as follows; we will have;
2, 8, 8, 8, 1
From the electron configuration given above, we can see that the outer most electron of cobalt is 1, meaning that is has only 1 unpaired electron in ground state.
Thus, cobalt atom (Co) has one (1) unpaired electron in ground state.
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When mixed, aqueous solutions of aluminum nitrate, Al(NO3)3, and ammonium carbonate, (NH4)2CO3, will form a precipitate of aluminum carbonate, Al2(CO3)3. The balanced equation is:
2Al(NO3)3(aq) + 3(NH4)2CO3(aq) à Al2(CO3)3(s) + 6NH4NO3(aq)
Which of the following statements regarding this reaction is incorrect?
A)2 moles of Al(NO3)3 will react with 3 moles of (NH4)2CO3.
B)If 6 moles of (NH4)2CO3 react with sufficient Al(NO3)3, 2 moles of Al2(CO3)3 will be formed.
C)If 0.5 mole of (NH4)2CO3 react with sufficient Al(NO3)3, 3 moles of Al2(CO3)3 will be formed.
D)If 1.5 moles of Al2(CO3)3 are formed, given sufficient starting materials, then 9 moles of NH4NO3 will also be formed.
E)4 moles of Al(NO3)3 will react with 6 moles of (NH4)2CO3.
F)If 4 moles of Al(NO3)3 reacts with 9 moles of (NH4)2CO3 there will be left over (NH4)2CO3
Answers
The incorrect statement regarding the reaction between aqueous solutions of aluminum nitrate, Al(NO3)3, and ammonium carbonate, (NH4)2CO3, which form a precipitate of aluminum carbonate, Al2(CO3)3 is If 0.5 mole of (NH4)2CO3 react with sufficient Al(NO3)3, 3 moles of Al2(CO3)3 will be formed. Option C.
A chemical equation is a description of the chemical reaction that takes place. It contains the formulae of the reactants and products separated by an arrow. The arrow indicates the direction of the reaction. The stoichiometric coefficients in the equation represent the number of moles of each substance involved in the reaction.
Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It's important to keep in mind that the law of conservation of mass applies to chemical reactions. This means that the number of atoms of each element present in the reactants must equal the number of atoms of that element present in the products. Thus, stoichiometry plays a significant role in determining how much product is formed from a given amount of reactant and vice versa. Option C.
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which of the following options correctly describe the oxidation of primary alcohols? select all that apply. multiple select question. primary alcohols require different oxidizing conditions than secondary alcohols. a carboxylic acid can be produced by oxidation of a primary alcohol. during oxidation, a primary alcohol will rearrange to produce a more substituted oxidation product. mild oxidizing conditions will result in an aldehyde product. harsher oxidizing conditions will produce a ketone from a primary alcohol.
Answers
The options that describe the oxidation of the primary alcohols is a carboxylic acid can be produced by oxidation of a primary alcohol. Mild oxidizing conditions will result in an aldehyde product.
The Primary alcohols will be oxidized to form the aldehydes and the carboxylic acids. The secondary alcohols will be oxidized to give the ketones. The Tertiary alcohols, in the contrast, cannot be oxidized by without breaking the molecules of the C–C bonds.
The Primary alcohols and the aldehydes will be normally oxidized to the carboxylic acids using the potassium dichromate solution in the presence of the dilute sulfuric acid that is H₂SO₄.
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if 100. ml of 1.60 m na2so4 is added to 200. ml of 2.40 m nai, what is the concentration of na ions in the final solution? assume that the volumes are additive.if 100. ml of 1.60 m na2so4 is added to 200. ml of 2.40 m nai, what is the concentration of na ions in the final solution? assume that the volumes are additive.2.14 m5.60 m7.25 m2.67 m4.00 m
Answers
The concentration of Na ions in the final solution is 2.67 M.
To determine the concentration of Na ions in the final solution, we need to consider the amount of Na ions contributed by each compound.
From 100 mL of 1.60 M Na2SO4, we have:
Na ions = 2 * (1.60 M) * (0.100 L) = 0.320 moles
From 200 mL of 2.40 M NaI, we have:
Na ions = 1 * (2.40 M) * (0.200 L) = 0.480 moles
To find the total moles of Na ions in the final solution, we add the moles from Na2SO4 and NaI:
Total Na ions = 0.320 moles + 0.480 moles = 0.800 moles
To calculate the concentration of Na ions in the final solution, divide the total moles by the total volume of the solution:
Concentration = Total moles / Total volume
Concentration = 0.800 moles / (100 mL + 200 mL) = 0.800 moles / 0.300 L = 2.67 M
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How many moles are in 25 grams of nitrogen trihydride?
Answers
Explanation:
molecules NH3 = 1.47 moles x 6.02x1023 molecules/mole = 8.9x1023 molecules of NH3 (to 2 sig. figs.)
2 KCl) - 2 K/s + Cl2,0)
)
(و
When potassium chloride breaks down, potassium metal and chlorine gas are formed. What type of reaction is this?
es 0))
A)
synthesis
B)
decomposition
c
single replacement
D)
double replacement
Answers
In the reaction, potassium chloride (KCl) is breaking down to form potassium metal and chlorine gas (\(Cl_2\)). The K+ ions in KCl switch places with the Cl- ions to form KCl and (\(Cl_2\).). Therefore, the correct answer is D) double replacement.
The reaction you provided is a double replacement reaction. In a double replacement reaction, the ions in one compound switch places with the ions in another compound, resulting in two new compounds with different compositions. The theory of double replacement reactions is based on the idea that two compounds can exchange ions of opposite charge to form two new compounds. This occurs because the ions in a compound are held together by electrostatic forces.
When two ionic compounds are mixed together, the ions are attracted to each other by their opposite charges. This attraction can overcome the intermolecular forces that hold the ions in place in their original compounds. As a result, the ions can switch places, allowing the compounds to break down into two new compounds with different compositions.
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Correct Question:
((2 KCl) - 2 K/s + Cl2,0))When potassium chloride breaks down, potassium metal and chlorine gas are formed. What type of reaction is this?
A) synthesis
B) decomposition
C) single replacement
D) double replacement
Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that they are in the same group on the periodic table of elements. The table shows other properties that Eriq observed.
Answers
Answer:
The four elements are most likely halogens which belong to group 7A in the periodic table.
Explanation:
The elements most likely are halogens because they usually display the same pattern of bonding as they are all diatomic molecules that need one electron to fill their outermost shell.
Another thing is that, halogens possess very strong type of ionic bonds which make them very reactive such that they react with metals to form salts. Due to this reason, they are called salt dormers.
There are other properties of these elements too such as: atomic radius, melting and boiling points, electronegativity e.t.c. They may increase or decrease down the group.
The elements belong to group 7A.
Answer:
Explanation:
The four elements are most likely halogens which belong to group 7A in the periodic table
The elements most likely are halogens because they usually display the same pattern of bonding as they are all diatomic molecules that need one electron to fill their outermost shell.
Another thing is that, halogens possess very strong type of ionic bonds which make them very reactive such that they react with metals to form salts. Due to this reason, they are called salt dormers.
There are other properties of these elements too such as: atomic radius, melting and boiling points, electronegativity e.t.c. They may increase or decrease down the group.
The elements belong to group 7A.
You dilute your extracted curcumin sample by first taking 1 mL and diluting it to 10 mL and then taking 2 mL of that solution and diluting it to 6 mL. What is the total dilution factor? The final solution is than the original extract. times more dilute
Answers
The total dilution factor for the extracted curcumin sample is 60. The final solution is 60 times more dilute than the original extract.
To calculate the total dilution factor, we need to multiply the dilution factors of each step. In the first step, the 1 mL sample is diluted to 10 mL, which is a dilution factor of 10. In the second step, the 2 mL solution is diluted to 6 mL, which is a dilution factor of 3.
To find the total dilution factor, we multiply these individual dilution factors: 10 x 3 = 30. However, since we have two steps of dilution, we multiply by another factor of 2: 30 x 2 = 60.
Therefore, the total dilution factor is 60, indicating that the final solution is 60 times more dilute than the original extract.
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For the following equilibrium, what will occur if the vessel contracts: C(s) H2O(g)⇌CO(g) H2(g)
Select the correct answer below: a. shift right b. shift left c. no change d. impossible to predict
Answers
Answer:
When the vessel contracts, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.
Why are some areas of Earth concentrated with minerals while others are not? *
-some areas of Earth have past or current volcanic activity
-some areas of Earth were swamps in the past
-minerals can only form near water
-the climate in certain areas is ideal for mineral formation
SCIENCE WORK*
Answers
Some areas of earth is concentrated with minerals because, some areas of earth have past or current volcanic activity. Hence, option A is correct.
What are minerals ?Minerals are naturally occurring inorganic compound with a definite composition and crystalline structure. For example, calcium carbonate, iron oxide etc. are mineral deposits.
Aluminum, diamonds, gold, nickel, lead, zinc, and copper minerals are produced or hosted by volcanoes directly or indirectly. The majority of these materials are used regularly by humans, and throughout the course of our lifetimes, we use significant amounts of certain of these minerals.
Many of the most significant metals that are mined on Earth had their beginnings in volcanic settings, either directly or indirectly. For instance, a volcanic rock may never reach the surface of the earth and will thus cool slowly in plutonic conditions.
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This element has nine more electrons than Technetium
Answers
Answer:
Tellurium
Explanation:
Technetium's position on the periodic table is 43 and Tellurium's is 52
Why is there such a large jump and ionization energy between the second and third ionization energy‘s for magnesium?
Answers
How many moles of water (H2O) are needed to react completely with 7. 3 moles of iron (Fe)? *
2 points
5. 5 mol water
2. 4 mol water
4. 0 mol water
9. 7 mol water
Answers
D. 9. 7 mol of water are needed to react completely with 7. 3 moles of iron (Fe)
To determine the number of moles of water needed to react completely with 7.3 moles of iron (Fe), we need to balance the chemical equation for the reaction between iron and water. The balanced equation is:
3 Fe + 4 \(H_{2}O\) -> \(Fe_{3}O_{4}\) + 4 \(H_{2}\)
According to the balanced equation, 4 moles of water are required to react with 3 moles of iron. This means that the stoichiometric ratio between water and iron is 4:3.
Given that we have 7.3 moles of iron, we can use this ratio to calculate the amount of water needed. We set up the following proportion:
4 moles \(H_{2}O\) / 3 moles Fe = x moles \(H_{2}O\) / 7.3 moles Fe
Cross-multiplying and solving for x, we find:
x = (4 moles \(H_{2}O\) / 3 moles Fe) * 7.3 moles Fe
= 9.73 moles \(H_{2}O\)
Therefore, approximately 9.7 moles of water are needed to react completely with 7.3 moles of iron. The closest option provided is 9.7 mol water. Therefore, Option D is correct.
The question was incomplete. find the full content below:
How many moles of water (\(H_{2}O\)) are needed to react completely with 7. 3 moles of iron (Fe)? * 2 points
A. 5. 5 mol water
B. 2. 4 mol water
C. 4. 0 mol water
D. 9. 7 mol water
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100. 0 g sample of aluminum at 0. 00 °C absorbs 1379 J
of heat. What is is final temperature?
Answers
The final temperature of the 100 g sample of aluminum is 15.3°C after it absorbs 1379 J of heat at an initial temperature of 0.00°C and the specific heat capacity of aluminum is 0.903 J/g °C.
The specific heat capacity of aluminum is 0.903 J/g °C. As given in the question, 0.00°C is the initial temperature of 100 g sample of aluminum and it absorbs 1379 J of heat. We need to find out the final temperature of the sample of aluminum.
Here's how we can calculate it:
Given,Mass of aluminum, m = 100 g
Heat absorbed by the aluminum, Q = 1379 J
Temperature of aluminum, t1 = 0.00°C (initial temperature)
Specific heat capacity of aluminum, c = 0.903 J/g °C
Temperature of aluminum, t2 = ?Q = mc(t2 - t1)1379 = 100 × 0.903 × (t2 - 0.00)
On solving this equation, we get: t2 = 15.3°
, the final temperature of the 100 g sample of aluminum is 15.3°C.
: The final temperature of the 100 g sample of aluminum is 15.3°C after it absorbs 1379 J of heat at an initial temperature of 0.00°C and the specific heat capacity of aluminum is 0.903 J/g °C.
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To calculate the final temperature of a 100.0 g sample of aluminum that absorbs 1379 J of heat at 0.00 °C, we can use the specific heat capacity of aluminum to determine the amount of heat energy required to raise the temperature of the sample by one degree Celsius.
The specific heat capacity of aluminum is 0.90 J/g°C. This means that it takes 0.90 J of energy to raise the temperature of one gram of aluminum by one degree Celsius.
To calculate the amount of energy required to raise the temperature of the 100.0 g sample by one degree Celsius, we can use the following formula:
Energy = mass x specific heat capacity x change in temperature
Where:
Energy = 1379 J (the amount of energy absorbed by the aluminum)
Mass = 100.0 g
Specific heat capacity = 0.90 J/g°C
Change in temperature = final temperature - initial temperature
We can rearrange this formula to solve for the final temperature:
Final temperature = (energy / (mass x specific heat capacity)) + initial temperature
Substituting the values we know:
Final temperature = (1379 J / (100.0 g x 0.90 J/g°C)) + 0.00 °C
Final temperature = 15.32 °C
Therefore, the final temperature of the aluminum sample is 15.32 °C.
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_N2 + _H2 = _NH3
Will there be any leftover reactants left?
(Kinda urgent)
Answers
Answer:
This reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.
N+H→NH3
We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to
N2+H2→NH3
Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently, we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.
We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.
N2+3H2→2NH3
This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.
Explanation:
I hope this was helpful.
SMARTERTEACHER
Answer:
Balance the equation N2 + H2 ⇒ NH3
Balancing chemical equations is usually easier than it looks
There are 2 Nitrogens and 2 Hydrogens on the left side
There are 1 Nitrogen and 3 Hydrogens on the right side
Hydrogen seems to be the more complicated term so we should start with that
_N2 + _H2 ⇒ _NH3
With 2 H on one side and 3 on the other, our common multiple is 6
To balance the H we need to multiply H2 by 3 and NH3 by 2
_N2 + 3H2 ⇒ 2NH3
Now that we have H balanced, we need to look at N
There are 2 Nitrogens on both sides of the equation, so in this case, it is done
Which of the following is necessary to do a complete stoichiometric calculation?
a
Add the nuclear masses of the products.
b
Divide the nuclear masses of the reactants.
c
Write the complete balanced chemical equation.
d
Write the number of atoms in 1 mole of the product.
Answers
Stoichiometry is the branch of chemistry that deals with the calculation of the quantities of reactants and products involved in a chemical reaction. A balanced chemical equation is necessary for stoichiometric calculations because it shows the mole ratio between reactants and products. Without a balanced chemical equation, it is impossible to determine the correct mole ratios and perform accurate stoichiometric calculations.
Option a) and b) are not relevant to stoichiometric calculations, as they pertain to nuclear chemistry, not chemical reactions. Option d) is related to the concept of Avogadro's number, which is important for calculating the number of atoms or molecules in a given amount of substance, but it is not directly related to stoichiometry.
Do earth’s magnetic north and south poles align exactly with the geographic North and South poles? Describe where they are.
Answers
Answer:
Earth is like a giant magnet with a North and South Pole. However, the magnetic North and South Pole are not aligned with the Geographic North and South Pole. The Geographic North Pole is defined by the latitude 90° N and is the axis of the Earth's rotation.
Explanation:
A personality test can help people in their careers by
Answers
Answer:
Personality tests are often used to gain insight into who people are, along with what motivates them. From an employer perspective, understanding the personality of a potential hire can shed light on their work style and how they might fit into the company's work culture
I need help with stoichiometry! if you could help please respond to this question and i will post the question. reason being, no one has answered the questions i have posted, and I need help quickly!
Answers
Answer:
will go do that.
Explanation:
Using the following equation, determine the males of sucrose (CisH55011 ) produced given 100 g of 02.
12 CO, + 11 H,0 - C2H2,0, + 12 0
Answers
Answer:
A --0.26 mol
Explanation:
using the stoichiometry ratio
1mol of sucrose -----> 12 moles of O2
no of mole of O2 = mass in g / mm
mm of O2 =2(16)
=32
no of mole of O2= 100/32
= 3.125 mol
recall
1 mol of sucrose ==> 12 mol of O2
1 mol of sucrose = 3.125/12
=== 0.2604 mol ✅✅
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An evaporating dish with a sample of a solution has a mass of 145.3 g. After evaporation, the dish and residue have a mass of 65.2 g. What additional information would be measured in the lab to calculate mass of the solute in the solution?
A) The mass of the solute
B) The mass of the solvent
C) The mass of the evaporating dish
D) The mass of the residue in the dish
Answers
Answer: C
Explanation:
The extra information that should be measured is the mass of the evaporating dish so that you could calculate the mass of solute and solution and then percent by mass of the solute in solution.
So correct option is C the mass of the evaporating dish.
every time atoms form a new bond, the reaction releases____
A) Time
B) Muir
C) Energy
Answers
Answer:
c. energy
Explanation: an atom increases negative charge put frustration/ stress on other electrons causing alot of energy to be released.
The only way to see the far side of the moon is
Answers
Answer:
Only one side of the spherical Moon is ever visible from Earth it wasn't until 1959 when the Soviet Spacecraft Luna 3 orbited the Moon and sent pictures home that human beings were able to see the "far side" of the Moon for the first time. A phenomenon called tidal locking is responsible for the consistent view