Answers
Zinc reacts with hydrochloric acid is the correct observation of a chemical property and the right response to the question above.
Equation:
Zn +2HCL → ZnCl2 +H2
Balanced equation:
Zn +2HCL → ZnCl2 +H2
Atomic number 30 and the letter Zn identify zinc as a chemical element. When the oxidation is eliminated, zinc becomes shiny-greyish and becomes a somewhat brittle metal at normal temperature.
Zinc is a crucial trace element for all living things, including humans, animals, plants, and microbes. After iron, it is the trace metal found in humans in the second-highest concentration. As a crucial cofactor for several enzymes, zinc is also a crucial vitamin for development. Many disorders can be caused by a zinc shortage. slowing in growth, infection susceptibility, and diarrhea are among effects of deficiency in children. . Consuming too much zinc can result in copper shortage, ataxia, and sluggishness.
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Related Questions
HEEELP! :)
Explain the claims:
a) octane (C8H18) mixes well with CCl4
b) methanol (CH3OH) is mixed with water in all ratios
c) NaBr dissolves very poorly in acetone (CH3 ― CO ― CH3)
Answers
A substance can dissolve in another when they have thee same type of intermolecular interaction.
What is solubility?The term solubility of a solute refers to the extent to which a solute dissolve in a solvent. We must know that a substance can dissolve in another when they have thee same type of intermolecular interaction.
Thus;
a) Octane (C8H18) mixes well with CCl4 because they are both non polar substances.
b) Methanol (CH3OH) is mixed with water in all ratios because the both are polar substances.
c) NaBr dissolves very poorly in acetone (CH3 ― CO ― CH3) because acetone is only slightly polar.
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List the three different temperature scales
Answers
Answer:
Celcius
Farenheit
Kelvin
Explanation:
Name the following aldehyde PLEASE PLEASE HELP
Answers
Answer:
Explanation:
Answer is D 2,5-dimethylheptanal
You should accern the lowest possible number close to the parent name
Choose your favorite element. Complete the blank periodic table entry for that element to the left. Research your element and write one interesting fact you discovered below
CAN YOU HELP ME, PLESE RIGHT NOW
Answers
Sodium is a metal that belongs to group 1 of the periodic table.
What is my favorite element?My favorite element is sodium. Sodium is found in group one of the periodic table. The element is univalent and also forms univalent positive ions. Like every other metal, sodium is able to react with dilute acids to liberate hydrogen gas.
Sodium is a light metal and is known to react with mercury to form the sodium mercury amalgam which is obtained during the electrolysis of sodium chloride. All of the compounds that are formed by sodium are ionic in nature. However the hydrides of sodium are unstable.
Sodium is highly reactive thus it must not be exposed to air since it could ignite spontaneously in air. As such, sodium must be stored under paraffin oil. All the compounds of sodium are ionic in nature.
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What is the concentration (molarity) of a solution of NaCl if 350. mL of a 2.5 M NaCl solution is diluted to a total volume of 5.0 mL? (NEED HELP ASAP)
Answers
The concentration (molarity) of the final NaCl solution is 175 M.
To find the concentration (molarity) of the final NaCl solution, we can use the equation:
M1V1 = M2V2
Where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.
In this case, we have an initial NaCl solution with a concentration of 2.5 M and a volume of 350 mL (0.350 L). We are diluting this solution to a total volume of 5.0 mL (0.005 L).
Plugging these values into the equation, we have:
(2.5 M) * (0.350 L) = M2 * (0.005 L)
Simplifying the equation:
0.875 = 0.005 * M2
Dividing both sides by 0.005:
M2 = 0.875 / 0.005
M2 = 175M
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When objects are left outside, such as a horseshoe, the iron reacts with oxygen to form rust. is it a chemical property of iron
Answers
Answer:
It is a chemical reaction because it is a reaction to the oxygen
Explanation:
Which statements describe an element? Check all that apply.
An element is a pure substance.
An element is made of only one type of atom.
An element is made of two or more different types of atoms.
An element can be broken down into a simpler form.
An element cannot be broken down into a simpler form.
Answers
Answer:
An element is a pure substance.
An element is made of only one type of atom.
An element cannot be broken down into a simpler form.
Explanation:
A 10.0-mL sample of an unknown H3PO4 solution requires 112 mL of 0.100 M KOH to completely react with the H3PO4. What was the concentration of the unknown H3PO4 solution
Answers
Answer:
The correct answer is 0.373 M.
Explanation:
The reaction will be,
H3PO4 (aq) + 3KOH (aq) ⇔ 3H2O (l) + K3PO4 (aq)
Based on the given information, the molarity of the solution KOH is 0.100 M, the volume of the solution given is 112 ml or 0.112 L.
The molarity of the solution with respect to KOH is,
M = Moles/Volume of Solution (liters)
Moles of solute = Molarity * Volume of solution
Moles = 0.100 M * 0.112 L
= 0.0112 moles
From the reaction it is clear that 3 moles of KOH needed 1 mole of H3PO4, thus, 0.0112 moles of KOH will require,
1/3 * 0.0112 = 0.00373 moles of H3PO4
The volume of the H3PO4 solution is 10 ml or 0.01 L.
The molarity of the solution will be,
M = Moles/ Volume of Solution (liters)
M = 0.00373/0.01 = 0.373 M
Thus, the concentration of the solution is 0.373 M.
The concentration of the H3PO4 would be 0.37 M
Going by the balanced equation of the reaction:
\(3KOH + H_3PO_4 ---> 3H_2O + K_3PO_4\)
The mole ratio of KOH to H3PO4 is 3:1.
Using the equation: CaVa/CbVb = 1/3
What we are looking for is Ca:
Ca = CbVb/3Va
= 0.1 x 112/3 x 10
= 0.37 M
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Where do plants get their energy?
Answers
Answer: they get their energy from the sun.
Explanation:
__H₂ + __ O₂ → __ H₂O What type of reaction is above:
Answers
Answer:
2H2 + O2 --> 2H2O
Explanation:
This should be correct
The temperature at which a liquid becomes a gas is the
point.
O A) freezing
O B) boiling
O C) condensation
O D) melting
Answers
Answer:
Boiling
Explanation:
How can we increase the surface area of reactants?
add a catalyst
O place them in a flame
dissolve them in water
o add more particles to the solution
Answers
Answer:
O place them in a flame dissolve them in water o add more particles to the solution.
Lesson 06.02 and 06.03: Reading for Argument Graphic Organizer
Answer the questions and complete the graphic organizers as you move through the
two lessons. The notes on 6.02 will help you on your Lesson 6.02 assessment. The whole
graphic organizer will be submitted in lesson 6.03.
6.02: Summarize the Claims and Evidence
2
1. 1. What are the Constitution and Declaration of Independence described as?
Excerpt #
1
3
1. 2. Summarize the claims and evidence King uses in his speech. Excerpt 1 has been
completed as an example for you.
Claims and Evidence
Claim 1: The Constitution and the Declaration of Independence promise
equal rights to all Americans, not just white people.
Claim 2: America has failed to deliver the rights promised by the
Constitution and Declaration of Independence to black people.
Evidence for Claim 2:
Evidence for Claim 2:
Claim 3:
Claim 4:
Answers
They are described as promissory notes that guarantee the unalienable rights of life, liberty, and the pursuit of happiness.
Claim 1 is that the Constitution and the Declaration of Independence give equal rights to all Americans. The evidence for this claim is found in the article of the Declaration of Independence.
Claim 2 is that America has failed to deliver these rights to black people. The evidence for this is found in the speech "I Have a Dream" by Martin Luther King Jr.
What are the Constitution and Declaration of Independence?The Constitution and Declaration of Independence are described as promissory notes that guarantee the unalienable rights of life, liberty, and the pursuit of happiness.
Following are the Claims and Evidence:
Claim 1: All Americans, not only whites, are guaranteed equal rights under the Constitution and the Declaration of Independence.
The Declaration of Independence has supporting evidence for Claim 1.
Claim 2: The United States has failed to grant black people the rights outlined in the Constitution and Declaration of Independence.
Martin Luther King Jr.'s "I Have a Dream" speech serves as proof for Claim 2.
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explain order of reaction and use the data below and the rate equation to show how it is calculated.
Using the data above determine
(a) order with respect to (A)
(b) order with respect to (B)
(c) rate equation
(d) overall order
Answers
The rate equation is Rate = k[A]²[B]³, and the reaction has an overall order of 5.
If the rate equation is correct, what is the reaction's order?A rate law illustrates how a chemical reaction's rate is influenced by the reactant's concentration. The rate law typically has the formula rate = k[A]n for reactions like aA products, where k is the proportionality constant also known as the rate constant. and The reaction's sequence in relation to A is indicated by n.
Rate = k[A]x[B]y
Rate = k[A]²[B]³
Overall order = 2 + 3 = 5
Therefore, the overall order of the reaction is 5, and the rate equation is Rate = k[A]²[B]³.
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4- The standard potential of cell: Sn/Sn²+||Cr³+/Cr is −0.60V.what is the standard
reduction potential of the Cr³+/Crelectrode? Es = -0.14V
Sn²+
(b) +0.74V
(c) -0.88V
(d) -0.74V
(a) +0.88V
Answers
The standard reduction potential of the Cr³+/Cr electrode is -0.46V. None of the option is correct.
To determine the standard reduction potential of the Cr³+/Cr electrode, we can use the Nernst equation, which relates the standard reduction potential to the cell potential under non-standard conditions. The Nernst equation is given by:
E = E° - (0.0592/n) * log(Q)
where E is the cell potential, E° is the standard reduction potential, n is the number of electrons transferred in the half-reaction, and Q is the reaction quotient.
In this case, we have the standard potential of the cell as −0.60V. We know that the standard reduction potential of the Sn/Sn²+ electrode is -0.14V. Therefore, the reduction potential of the Cr³+/Cr electrode can be calculated as:
E = -0.60V - (-0.14V)
E = -0.60V + 0.14V
E = -0.46V
Therefore, the standard reduction potential of the Cr³+/Cr electrode is -0.46V.
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Which of the following is not a natural
way water is stored in the water cycle?
A Stream
B. Pond
C. Iceberg
D. Cup
Answers
Answer:
cup...................
When would a transformation of chemical energy to electrical energy occur?(1 point)
when the current becomes zero
when a reaction produces the same products
when there is chemical reaction between metals and nonmetals
\
when electrons stop moving between atoms
Answers
A transformation of chemical energy to electrical energy occurs when there is a chemical reaction between metals and nonmetals.
What is electrical energy?The movement of electrons from one atom to another is what results in electrical energy.
A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.
Hence, option C is correct.
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A squirrel running up a tree and sitting on a branch shows what kind of energy conversion
Answers
Polyethylene is 86.0% C and 14.0%
H. Determine the empirical formula of the compound.
Percent to Mass: How many grams of C/and Hare present in 100.0 g?
Answers
The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.
For carbon:
Mass of carbon = 86.0% × 100.0 g = 86.0 g
For hydrogen:
Mass of hydrogen = 14.0% × 100.0 g = 14.0 g
Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.
The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.
First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.
Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol
Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol
Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.
Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939
Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.
Carbon: Hydrogen ≈ 2 : 3.878
Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.
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A student planned to make copper sulfate crystals from excess copper oxide and dilute sulfuric acid.
The equation for the reaction is:
CuO(s) + H,SO (aq) -, CuSO (aq) + H20(1)
This is the method used.
1. Add 25 cm° of dilute sulfuric acid to a conical flask.
2. Gently warm the dilute sulfuric acid.
3. Add excess copper oxide to the dilute sulfuric acid.
4. Stir the mixture.
5. Heat to evaporate all the water from the mixture.
Suggest two improvements to the method
Explain why each improvement is needed.
A student plans a method to prepare pure crystals of copper sulfate.
The student's method is:
1. Add one spatula of calcium carbonate to dilute hydrochloric acid in a beaker.
2. When the fizzing stops, heat the solution with a Bunsen burner until all the liquid is gone.
The method contains several errors and does not produce copper sulfate crystals.
Explain the improvements the student should make to the method so that pure crystals of copper sulfate are produced.
Answers
The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.
Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.
Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.
Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.
Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.
By following these improvements, the student can obtain pure crystals of copper sulfate.
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Given the law of conservation of energy, what happens when a 200°C iron bar is placed in thermal contact with a 30°C block of wood?
Answers
When a 200°C iron bar is placed in thermal contact with a 30°C block of wood, energy leaves the iron bar and enters the wood until the temperatures are equal.
Law of conservation of energy states that the energy cannot be lost or formed but it can only be transformed from one form to another.
According to the given question, the block of wood is at a lower temperature than an iron bar. Hence, heat will flow from the iron bar to the block of wood until the temperatures of both are equal.
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The element nitrogen forms a(n) _______ with the charge . The symbol for this ion is , and the name is . The number of electrons in this ion is .
Answers
Answer:
The element nitrogen forms an anion with the charge -3. The symbol for this ion is N³⁻, and the name is nitride. The number of electrons in this ion is 10.
Explanation:
The element nitrogen is in the Group 15 in the Periodic Table, so it tends to gain 3 electrons (3 negative charges) to fill its valance shell with 8 electrons.
The element nitrogen forms an anion with the charge -3. The symbol for this ion is N³⁻, and the name is nitride. The number of electrons in this ion is 10 (the original 7 plus the 3 gained). It is isoelectronic with the gas Neon, which accounts for its stability.
What is the molar mass
MgCrO4
Answers
The molar mass of MgCrO4 is approximately 140.30 g/mol.
To determine the molar mass of MgCrO4 (magnesium chromate), we need to calculate the sum of the atomic masses of each individual element in the compound.
The chemical formula MgCrO4 indicates that the compound consists of one magnesium atom (Mg), one chromium atom (Cr), and four oxygen atoms (O).
The atomic masses of the elements can be found on the periodic table:
Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.
Chromium (Cr) has an atomic mass of around 51.99 g/mol.
Oxygen (O) has an atomic mass of about 16.00 g/mol.
Now, we can calculate the molar mass of MgCrO4 by summing up the atomic masses of each element, considering the respective subscripts:
Molar mass = (Atomic mass of Mg) + (Atomic mass of Cr) + 4 × (Atomic mass of O)
Molar mass = (24.31 g/mol) + (51.99 g/mol) + 4 × (16.00 g/mol)
Molar mass = 24.31 g/mol + 51.99 g/mol + 64.00 g/mol
Molar mass ≈ 140.30 g/mol
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Which of the following does pascal's Principle help to explain?
Answers
Answer:
B) hydraulics
Explanation:
Answer:
hydraulics
Explanation:
i got it right the test on apex
:DDDDDDDD
The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
Answers
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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Cl2 + 2Na → 2NaCl How many grams of NaCl are produced by the reaction of 0.300 L of chlorine gas at STP with excess sodium?
Answers
Answer:
1.52 g of NaCl
Explanation:
We'll begin by calculating the number of mole of chlorine gas (Cl₂) that occupied 0.3 L at STP. This can be obtained as follow:
Recall: 1 mole of any gas occupy 22.4 L at STP.
1 mole of Cl₂ occupy 22.4 L at STP.
Therefore, Xmol of Cl₂ will occupy 0.3 L at STP i.e
Xmol of Cl₂ = 0.3 / 22.4
Xmol of Cl₂ = 0.013 mole
Thus, 0.013 mole of Cl₂ occupied 0.3 L at STP.
Next, we shall determine the number of mole of NaCl produced from the reaction.
Cl₂ + 2Na —> 2NaCl
From the balanced equation above,
1 mole of Cl₂ reacted to produce 2 moles of NaCl.
Therefore, 0.013 mole of Cl₂ will react to produce = 0.013 × 2 = 0.026 mole of NaCl.
Thus, 0.026 mole of NaCl is produced.
Finally, we shall determine the mass of the NaCl. This can be obtained as follow:
Mole of NaCl = 0.026 mol
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl =?
Mole = mass /Molar mass
0.026 = mass of NaCl / 58.5
Cross multiply
Mass of NaCl = 0.026 × 58.5
Mass of NaCl = 1.52 g
Therefore, 1.52 g of NaCl were produced from the reaction
7.
How many grams are contained in 3.9 x 1023 sulfur atoms?
atoms → moles
grams
I
Answers
Answer: 20.775 g S
Explanation: 3.9x10^23 atoms = 0.648 mol
Atomic mass S = 32.08
S in grams = 20.775
Text: Changing Land
1. What are three agents of change responsible
for changing landforms?
2. According to the text, what are 3 landforms
created by wind?
3. According to the text, what 2 landforms are
created by glaciers?
4. According to the text, what landform is formed
by deposition at the mouth of a river?
5. U-shaped valleys and canyons are both formed
by weathering and erosion. What is another
landform that is created due to weathering
and erosion?
Plissss help now
Is for cience
Answers
The three main causes of erosion, or the removal of soil, rock, and other materials, are wind, water, and ice.
What three factors lead to changes in landforms?Compared to plate tectonics, landforms are changed much more quickly by earthquakes, weathering, and people, and these changes are frequently visible.
Sand dunes, Loess Deposits, Yardangs, Ventifact, Deflation Hollow or Blowout, and Desert Pavement are among the geological features.
Glaciers carved a collection of strange valleys with flat bottoms and steep walls. Hanging valleys, fjords, and U-shaped valleys are a few examples of the different sorts of valleys that glaciers can destroy.
Alpine glaciers have their origins in the mountains, in a number of our National Parks. When they form in tiny basins with sloping sides, they are referred to as cirque glaciers (cirques).
U-shaped valleys have been found to be produced by glacial erosion. A massive glacier's journey through the landscape leaves imposing traces. Walls of rock blocks are torn apart by its abrasive force.
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select the word or phrase to describe hybrid orbitals and to predict the shapes of the resulting molecules
Answers
Answer:
Hybridization
Explanation:
The variations in bond angles of molecules and ions can be explained by two main concepts.
This is by the valence shell electron pair repulsion theory and hybridization.
We can arrive at the same shape using both of the mechanism. In hybridization, we use hybrid orbitals to predict the shapes of the resulting molecules. Hybridization is the mixing or blending of two or more pure atomic orbital to form two or more hybrid atomic orbitals that are identical in shape and energy.Answer:
1) Three sp2, trigonal planar, and bent
2) Tetrahedral, four sp3, and three p
Explanation:
got it correct on edg
You have an aqueous solution and add more and more base to it and plot the pH. You do the same experiment again, but the second time with a buffer in the solution. Compared to the solution without the buffer, for the solution with the buffer, the curve of the pH versus the amount of base added will
Answers
If a strong base is added to a buffer the pH will change only slightly. In the non-buffered solution changing the pH significantly.
If a strong base is added to a buffer, the weak acid will give up its H+ in order to transform the base (OH-) into water (H2O) and the conjugate base: HA + OH- → A- + H2O. Since the added OH- is consumed by this reaction, the pH will change only slightly.
In the non-buffered solution, the added hydronium or hydroxide ions have nothing to react with so the concentrations increase rapidly, changing the pH significantly. If a base is added to an acidic solution, the solution becomes less acidic and moves toward the middle of the pH scale.
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