1. Compare the masses and the charges for the three particles which make
up
the atom.
Answers
Answer:
The charge on a neutron=1+-/neutral
It has a mass 1
The charge on electron is 1-/negative
It's mass is 1/1840
The charge on a proton is 1+
It has a mass 1 too.
Explanation:
Related Questions
Explain why PCI5 can be formed whereas
PI5 cannot be formed.
Answers
Answer:
highly unstable
Explanation:
also, due to repulsion of lone pairs and instability it breaks and can't form PI5
hope that helps....
According to the electron sea model, the melting points of metals are not as extreme as the boiling points. This is because the cations and electrons are - in a metal. It does not take much energy for a solid to become liquid. But metallic bonds are very - , so it does require a lot of energy to separate atoms from the cations in their sea of electrons.
Answers
According to the electron sea model, the melting points of metals are not as extreme as the boiling points. Therefore, the given statement is correct is true.
What is electron sea model?The Electron Sea Model's whole hypothesis relies around the behavior of atoms throughout this bonding. The movement of unpaired electrons between positively charged metal ions in a mesh is known as metallic bonding.
According to the electron sea model, the melting points of metals are not as extreme as the boiling points. This is because the cations and electrons are - in a metal. It does not take much energy for a solid to become liquid. But metallic bonds are very - , so it does require a lot of energy to separate atoms from the cations in their sea of electrons. This statement is true.
Therefore, the given statement is correct is true.
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Calculate the freezing point depression for 1 kilogram of sodium chloride (NaCl) in 5 kilograms of
water. The Ky of water is -1.86 °C/m.
Answers
\(\\ \rm\dashrightarrow \Delta T_f=ik_fm\)
m is molalityMoles of NaCl
1000/2343.4molMolality
43.4/58.68\(\\ \rm\dashrightarrow \Delta T_f=i(-1.86)(8.68)\)
\(\\ \rm\dashrightarrow \Delta T_f=-16.14i\)
i is vant Hoff factor
For NaCl vant Hoff factor is 2( Actually 1.9)
\(\\ \rm\dashrightarrow \Delta T_f=-16.14(2)=-32.28°C\)
Moles of NaCl
\(\\ \tt{:}\dashrightarrow \dfrac{1000g}{23g/mol}\)
\(\\ \tt{:}\dashrightarrow 43.4mol\)
Find Molality
\(\boxed{\sf Molality=\dfrac{Moles\:of\:solute}{Volume \:of\: solution\:in\:kg}}\)
Volume of solution=1kg+5kg=6kg\(\\ \tt{:}\dashrightarrow m=\dfrac{43.4}{6}=7.2m\)
Vant Hoff factor
\(\\ \tt{:}\dashrightarrow NaCl\longrightarrow Na^++Cl^-\)
i=2Freezing point depression
\(\\ \tt{:}\dashrightarrow \Delta T_f=iK_fm\)
\(\\ \tt{:}\dashrightarrow \Delta T_f=2(-1.86)(7.2)\)
\(\\ \tt{:}\dashrightarrow \Delta T_f=-26.7°C\)
what is the compound name for Cu(OH)2
Answers
Answer:
Copper hydroxide is the correct answer.
Explanation:
Hope this helped Mark BRAINLIEST!!!
copper(||)hydroxide
a 10 ml suspension, in water, is made from a bloody stool sample collected from a neonate. the specimen is centrifuged and the resulting pink supernatant transferred in equal volumes to 2 tubes. the first tube serves as a reference while the second tube is alkalinized with 1 ml of 0.25 m sodium hydroxide. the second tube changes to yellow within 2 minutes. this reaction indicates the presence of :
Answers
The pink supernatant obtained from the centrifuged bloody stool sample of the neonate was likely to contain bilirubin. Bilirubin is a yellow-orange pigment that is produced from the breakdown of heme in red blood cells.
Normally, bilirubin is metabolized in the liver and excreted in bile. However, in neonates, the liver is not fully developed, and bilirubin may accumulate in the blood, causing jaundice.
The yellow color observed in the second tube, after adding 0.25 M sodium hydroxide, indicates the presence of conjugated bilirubin. Conjugated bilirubin is a water-soluble form of bilirubin that is excreted in bile.
Alkaline conditions (due to the addition of sodium hydroxide) convert unconjugated bilirubin into its water-soluble form, conjugated bilirubin. The rapid change to yellow color in the second tube suggests that the neonate had an excess of conjugated bilirubin, indicating a possible liver disease or other underlying condition that impairs bilirubin metabolism.
In summary, the yellow color change in the second tube indicates the presence of conjugated bilirubin in the bloody stool sample of the neonate, suggesting a possible liver disease or other underlying condition.
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One curie (Ci) of radiation is equal to?
Answers
One curie of radiation represents a significant amount of radioactive activity and is equivalent to 37 billion radioactive decays per second or 3.7 x 10^10 becquerels.
One curie (Ci) of radiation is a unit of measurement that describes the activity of radioactive material. It is defined as the amount of radiation emitted by one gram of pure radium-226, which has a half-life of 1,600 years.
To be more precise, one curie of radiation is equal to 37 billion radioactive decays per second. This means that every second, 37 billion atomic nuclei within the radioactive material undergo a process of radioactive decay, releasing energy and emitting particles such as alpha, beta, or gamma rays.
It is important to note that curie is an older unit of measurement that is not widely used today. Instead, the International System of Units (SI) has adopted the becquerel (Bq) as the standard unit of radioactivity. One curie is equivalent to 3.7 x 10^10 becquerels.
Understanding the measurement of radiation is important in fields such as nuclear physics, radiation therapy, and environmental monitoring.
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chemicals (and humans) are all about what
Answers
Answer:
Atoms, and chemical make up
Explanation:
Our bodies and any other terrestrial body are formed with atoms, those same atoms from a chemical make-up that creates items, such as water with 2 hydrogen atoms and 1 oxygen atom is formed. In essence, we all are about atoms and chemical makeup is the instruction on how to build us
He principal quantum number, n, represents the: a sub level of an electron b main energy level of a proton c main energy level of an electron d sub level of a proton
Answers
Answer:
c. main energy level of an electron
Explanation:
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are considered to be the building blocks of matter and as such defines or determines the structure of a chemical element.
Generally, atoms are typically made up of three distinct particles and these includes; protons, neutrons and electrons.
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
The principal quantum number, denoted by n, represents the main or overall energy level of an electron.
Basically, this property of an electron determines its energy level, as well as its distance from the nucleus of an atom of any chemical element. Also, as the distance of each orbital from the nucleus increases, the energy level increases respectively. Thus, sets of orbitals having the same principal quantum number (n) are generally referred to as an electron shell.
will give brainlist to a person with correct answers for all (please help me)
1. Explain how is LiCl formed?
2. What is a combination/synthesis reaction
3. What is a decomposition reaction?
4. What is a single-replacement reaction?
5. What is a double-replacement reaction?
6. What are the trends in electronegativity within groups and across periods in the periodic table?
7. Which element has the lowest electronegativity value?
8. How does electronegativity determine the type of bond that atoms will form?
9. What type of bond will form between 2 atoms that have a large difference in electronegativity?
10. What type of bond will form between 2 atoms when the difference in electronegativity is 0.5?
11. Which element has the highest electronegativity value?
12. What does it mean that matter cannot be created nor destroyed in a Chemical reaction?
Answers
Answer:
1. LiCi is formed by the treatment of lithium carbonate with hydrochloric acid
2. A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).
3. Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.
4. A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound
5. Double replacement reactions have two ionic compounds that are exchanging anions or cations.
6. The most electronegative elements are found on the top right of the periodic table.
7. cesium
8. Electronegativity describes the degree to which an atom attracts electrons in a chemical bond. But the electronegativity of two atoms would determine their bond type.
9. ionic bond
10. polar covalent bond
11. fluorine
12. Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change.
Hope i was able to help!!!
Tổng số hạt của một nguyên tử là 58. Số hạt mang điện nhiều hơn số hạt không mang điện là 18
hạt. Xác định Z, N, E, A
Answers
Answer:
what i dont understand
Explanation:
translate please
Match the correct type of energy transfer that takes place.
Answers
Answer:
Lightbulb: electrical energy to light energy
Alarm Clock: electrical energy to sound energy
Rollercoaster: electrical energy to mechanical energy
Riding a Bike: chemical energy to mechanical energy
Explanation:
Light bulbs, alarm clocks, and roller coasters require electrical energy to work. This energy then changes into the subsequent types. Light bulbs primarily emit that energy in the form of light, alarm clocks change that energy into sound, and roller coasters begin to move (mechanical). People power bikes, and the energy in our body is stored as chemical energy. So, when we rides bikes, that energy gets turned into moving (mechanical) energy.
Which element has similar properties to beryllium
Answers
The elements have similar properties to beryllium are magnesium and aluminium.
What do you mean by an element ?The term an element is defined as a pure substance that cannot be broken down by any physical or chemical means into simpler substances.
An element is made up of the same kind of atoms. Elements are classified into metals, nonmetals, and metalloids.
Atoms are made up of protons, neutrons, and electrons. Two unusual kinds of atoms can mix to produce a compound.
Magnesium, calcium, strontium, barium, radon are all chemically same to beryllium. Elements in the similar group have the same chemical properties because they have the equal number of valence electrons.
Thus, The two elements with properties most like beryllium are magnesium and aluminium.
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Give an example of direct and indirect evidence geologists use to study the interior of the Earth
Answers
Geologists use rock samples including sedimentary rocks as direct evidence and seismic waves as indirect evidence.
What are sedimentary rocks?They are the types of rocks which are formed as a result of accumulation of minerals or organic particles at the surface of the earth.Sedimentation is the name given to a collective process which cause the particles to settle.
The study of sedimentary rocks is useful in civil engineering and as important sources of coal, fossil fuels and ores.The color of sedimentary rock is often determined by iron content and sometimes due to the presence of organic matter.
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A solution of NaCl was prepared in the following manner: 0.0842 g of NaCl is massed out on an analytical balance. The solid is transferred to a 25.00 mL volumetric flask. Deionized water is added to the flask such that the bottom of the meniscus is at the line. A 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask using a volumetric pipet and diluted to volume. 6. Calculate the concentration of NaCl in the resulting solution in mg/L NaCl. (answer = 67.4 mg/L) 7. Calculate the concentration of NaCl in the resulting solution using propagation of error through the calculation. Use the manufacturer's tolerance values as the absolute error. The tolerances can be found in Chapter 2 of the Harris text. Assume a Class 1 balance and Class A glassware. Treat the tolerances as random error. (answer = 67.4+0.4 mg/L) 8. Identify 2 possible sources of random (indeterminate) error. Identify 2 possible sourses of systematic (determinate) error.
Answers
Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl
To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7. Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.
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A carbon-hydrogen bond in ethane (CH3CH3) is best described A) highly polar B) essentially nonpolar C) ionic D) a multiple bond E) resonance stabilized
Answers
A carbon-hydrogen bond in ethane (CH3CH3) is best described essentially nonpolar. Option B is correct.
A nonpolar bond is one in which electrons are shared equally between atoms.In Ethane, the carbon atom has four valence electrons, while the hydrogen atom has one valence electron. The carbon atom forms four covalent bonds to the hydrogen atoms. Since the hydrogen atoms are equivalent, all of the carbon-hydrogen bonds are identical.
Each of the carbon-hydrogen bonds has a bond distance of 109.5°.Ethane is a hydrocarbon with the formula C2H6. It is an alkane with two carbon atoms. It's also known as a saturated hydrocarbon because all of its carbon atoms are bonded to as many hydrogen atoms as possible. Because of this, it contains only single bonds between atoms.Each carbon in ethane is surrounded by four other atoms and has a tetrahedral geometry.
Since the electronegativity of carbon and hydrogen atoms is quite close, the carbon-hydrogen bonds in ethane are nonpolar and symmetric. Because the electronegativity values of carbon and hydrogen are close, there is no significant polarity between the carbon-hydrogen bonds. Therefore, the carbon-hydrogen bond in ethane is best described as essentially nonpolar.
Therefore, Option B is correct.
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HELP ME PWhat are the reactants in a chemical reaction?
O A. The ending substances
B. New substances that are formed
O c. All substances that are involved
O D. The starting substances
Answers
Answer:
D. the starting subtances
:)
Answer: D. The starting substances !!
Explanation:
if you measured a shift in the copper/ascorbic acid cell potential when the ph was changed, what was the origin of the shift? in other words, which half-cell potential was actually changing, the copper potential, the ascorbic acid potential, or both? (select all that apply.) when ph changes, the value of q changes. both half-cells experienced potential shifts when the ph was changed. the potential change was due to the ph change in the ascorbic acid half-cell. the ascorbic acid half-reaction contains two h ions. the ph change caused a difference in the rate of electron transfer which shifted the potential of the cu2 /cu half-cell. the reaction quotient contains a term for [h ]. the cu2 /cu half-cell did not have a role in the potential change.
Answers
The correct option and the correct order is B, C, E, G, and A, so the origin of the shift was When pH changes, the value of Q changes. The reaction quotient contains a term for [H^+].
The ascorbic acid half-reaction contains two H^+ ions. The Cu^2+/Cu half cell did not have a role in potential change. The potential change was due to the pH change in the ascorbic acid half cell.
b. When pH changes, the value of Q changes.
c. The reaction quotient contains a term for [H^+]
e. The ascorbic acid half-reaction contains two H^+ ions
g. The Cu^2+/Cu half cell did not have a role in potential change.
a. the potential change was due to the pH change in the ascorbic acid half cell.
pH is a measure of the acidity or basicity of a solution, defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in the solution. The pH scale ranges from 0 to 14, with 7 being neutral, values below 7 indicating acidity (higher concentration of H+ ions), and values above 7 indicating alkalinity or basicity (lower concentration of H+ ions).
The pH of a solution is an important property in many fields of science, including chemistry, biology, and environmental science. In chemistry, pH is used to describe the reactivity and stability of chemicals in solution, and is important in determining the solubility of substances. In biology, pH is a critical factor in maintaining the proper functioning of enzymes and other biochemical processes in living organisms.
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Complete Question: -
If you measured a shift in the copper/ascorbic acid cell potential when the pH was changed, what was the origin of the shift? In other words, which half-cell potential was actually changing, the copper potential, the ascorbic acid potential, or both? (Select all that apply.)
a. The potential change was due to the pH change in the ascorbic acid half-cell.
b. When pH changes, the value of Q changes.
c.The reaction quotient contains a term for [H+].
d.Both half-cells experienced potential shifts when the ph was changed.
e.The ascorbic acid half-reaction contains two H+ ions.
f. The pH change caused a difference in the rate of electron transfer which shifted the potential of the Cu2+/Cu half-cell.
g.The Cu2+/Cu half-cell did not have a role in the potential change.
which form of energy does a cheeseburger have
Answers
Answer:
chemical potential energy - It mainly has chemical potential energy, this is really a type of electrical potential energy stored in the chemical bonds of the molecules
Explanation:
You can give the other person brainliest, I don't need it! :)
To which galaxy does the Sun belong?
A Centaurus
B Milky Way
C Andromeda
D Canis Major
Pls help
Answers
Sulfur dioxide is a compound used to preserve grapes. What volume would a 23.8 g sample of sulfur dioxide take up if it were stored at STP? Round your answer to 3 significant figures.
A. 8.32 L
B. 0.120 L
C. 634 L
D. 1.26 L
Answers
Answer:
A . 8.32 L
Explanation:
Got it right on my test lol.
The volume would a 23.8 g sample of sulfur dioxide take up if it were stored at STP is 8.32 L.
The correct option is A.
What is volume?The volume of a substance is the total amount of space it occupied.
The volume of any substance can be calculated by mass divided by density.
The mass of Sulfur dioxide is 23.8g
The density should be taken as density of water 1.0 g/ ml
\(\rm Volume = \dfrac{mass}{density}\\\\\\Volume = \dfrac{23.8 g}{1.0\;g/ml} = 8.32\;L\)
Thus, the volume is A. 8.32 L
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The heat capacity of solid iron is 0.447 Jewels per gram in celsius. If the same quantity of energy as in #3 were transferred to a 450g chunk of iron at 20 Celsius, what would be the final temperature?
Answers
After transferring 65 kJ of heat, the iron's final temperature will be 343.14.
What is specific heat?The amount of heat necessary to increase the temperature of 1 g of a substance by 1 degree Celsius is known as the specific heat.
One can provide the specific heat by:
Q = mcΔT
Q equals 65 kJ of specific heat
0.447 J/g is the heat capacity, or c.
450 g is the iron's mass, or m.
ΔT = temperature change, or final temperature minus initial temperature.
ΔT=20 - final temperature
The values being entered into the equation:
65000 J = 0.447 J/g 450 g
(Final temperature - 20) 65000 J = 201.15
Temperature at the end minus 20 = 323.14
Temperature at the end: 343.14.
After transferring 65 kJ of heat, the iron's final temperature will be 343.14.
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Show the comparative structure of union Parishad and Pourahava in chart.
Answers
Answer:
how will I show?
Explanation:
pLS teacher me
i must be present in a compound for it considered organic
Answers
Answer:
Carbon
Explanation:
Organic compounds must contain carbon. They also usually contain hydrogen, oxygen, and often nitrogen and other compounds such as phosphorus.
Nearly all organic compounds contain carbon-hydrogen bonds.
hhhhhhhhhhhheeeeeeeeeeelllllllllllllppppppp
Answers
Answer:i dont even know myself :p
Explanation:
when a phase change occurs the temperature of the matter will ____________ until the phase change is complete.
Answers
When a phase change occurs, the temperature of the matter will remain constant until the phase change is complete.
This is because the energy that is added to or removed from the matter during a phase change is used to either break or form intermolecular bonds between the particles in the substance, rather than to increase or decrease the kinetic energy of the particles.
For example, during the melting of ice, the temperature of the ice remains constant at 0 degrees Celsius until all of the ice has melted. Similarly, during the boiling of water, the temperature of the water remains constant at 100 degrees Celsius until all of the water has boiled off.
Once the phase change is complete, the temperature of the matter will either increase or decrease again, depending on whether heat is being added to or removed from the substance. This is because the kinetic energy of the particles in the substance is once again affected by the addition or removal of heat.
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When wood is burned, new substance are produced. Describe this reaction, and explain
what type of changes occurs. Use the terms flammability, chemical property, and physical
change or chemical change.
Answers
Answer:
hahahaha
Explanation:
hahahahahhahahaha soooo funny
Titration of 15.00 mL of a weak, monoprotic acid solution requires 22.84 mL of a 0.09837M standardized NaOH solution. What is the molarity of the acid solution? (Show your work.)
Answers
The molarity of the acid solution is approximately 0.1499 M.
To determine the molarity of the acid solution, we can use the concept of stoichiometry in the neutralization reaction between the acid and base. The balanced equation for the reaction is:
acid + base → salt + water
From the given information, we can see that the acid is monoprotic, which means it donates only one proton (H+ ion) in the reaction. Therefore, the stoichiometry between the acid and base is 1:1.
First, let's calculate the number of moles of NaOH used in the titration:
moles of NaOH = concentration of NaOH × volume of NaOH used (in liters)
= 0.09837 M × 0.02284 L
= 0.002249 moles
Since the stoichiometry between the acid and base is 1:1, the number of moles of the acid is also 0.002249 moles.
Next, we need to calculate the molarity of the acid solution:
molarity of acid solution = moles of acid / volume of acid solution (in liters)
= 0.002249 moles / 0.01500 L
= 0.1499 M
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what effect has impurities on the melting and boiling points of pure substances? illustrate your answer with an example
....pls need it by tonight
Answers
Answer:
The presence of an impurity in a substance lowers the melting point, and raises the boiling point of the substance. For example, Impurities present in the water decrease the freezing temperature of the water, and in the same way, impurities increase the boiling point of the water.
A student need to predict the mass of a block of aluminum. The block is 4.23 cm on all sides and the density of aluminum is 2.7 g/cm3. What will the mass of the block be?
Answers
Density = mass / volume.
To rearrange for mass, you would times by volume on both sides to give you:
Mass = density x volume
Mass = 2.7 x (4.23^3)
= 2.7 x 75.686967
= 204.3548109
= 204.35 g (to 2 dp)
If 100 mL of a gas at 27°C is cooled to -3°C at constant
pressure, what will be the new volume of the gas?
Answers
If 100 mL of a gas at 27°C is cooled to -3°C at constant pressure, thus the new pressure of the gas comes out to be 89.94 cm³. The combined gas law, which connects the starting and end states of a gas under constant pressure, can be used to resolve this issue.
The combined gas law can be expressed as follows: P₁ * V₁/ T₁ equals P₂ * V₂ / T₂. Where: The initial and final pressures (assumed to be constant) are P₁ and P₂, respectively. The first volume is V₁.The initial temperature, T₁, is given in Kelvin.
The second volume is the one we're looking for, or V₂. The final temperature, T₂, is given in Kelvin.Let's use the information provided to solve for V₂: Volume at the start: V₁ = 100 mL = 100 cm³. Temperature at initialization: T₁= 27°C = 27 + 273.15 K = 300.15 K
T₂ = -3°C = -3 + 273.15 K = 270.15 K Final temperature. Inputting the values into the equation for the combined gas law: P₁ * V₁ / T₁ equals P₂ * V₂ / T₂. We can eliminate the pressure (P) because it is constant:(V₁ / T₁) = (V₂ / T₂)
To find V₂ by rearranging the equation: V₂ = (V₁ * T₂) / T₁, replacing the specified values: V₂ = (100 cm³ * 270.15 K) / 300.15 K. Calculating: V₂ ≈ 89.94 cm³. As a result, the gas's new volume will be roughly 89.94 cm3 when it is cooled from 100 mL at 27°C to -3°C at constant pressure.
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