Chapter 6.4 Chemical Reactions
Questions and Answers
- 1.
Carbon in the form of charcoal has a different number of protons in its nucleus than carbon in the form of diamond.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
All atoms of Carbon have 6 protons in their nucleus. The number of protons in an atoms nucleus is what determines which element it is.Rate this question:
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- 2.
In chemical reactions, an Oxygen atom can sometimes be converted into a Nitrogen atom.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Atoms are not changed from one type of atom (eg Oxygen) into another type of atom (eg Nitrogen) in chemical reactions, they are just rearranged into different substances. Eg when Hydrogen gas reacts with Oxygen gas, the atoms are rearranged so molecules of water are produced, but all the atoms stay as the same element as they were before the reaction.Rate this question:
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- 3.
When chemical reactions occur, new atoms are not created, they are just rearranged into different substances.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Chemical reactions involve the rearrangement of atoms to form different substances. This means that no new atoms are created or destroyed during a chemical reaction. Instead, the existing atoms are rearranged to form new compounds or molecules. This principle is known as the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction, only transformed. Therefore, the given statement is true.Rate this question:
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- 4.
Which of the following models could represent Carbon Monoxide (CO) ?
- A.
- B.
- C.
Correct Answer
B.Explanation
A Carbon Monoxide (CO) molecule has one Carbon atom and one Oxygen atomRate this question:
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- 5.
Which of the following models best represents an Ammonia () molecule?
- A.
- B.
Correct Answer
A.Explanation
An Ammonia molecule has 1 Nitrogen atom and 3 Hydrogen atomsRate this question:
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- 6.
How many Hydrogen atoms in 1 molecule of ethane ?
Correct Answer
6Explanation
The large number of to the left of an molecule represents the number of molecules.
The small numbers to the right of an element symbol represent the number of atoms in the molecule.Rate this question:
- 7.
How many Hydrogen atoms in 2 molecules of ethane ie. ?
Correct Answer
12Explanation
The large number of to the left of an molecule represents the number of molecules.
The small numbers to the right of an element symbol represent the number of atoms in the molecule.Rate this question:
- 8.
How many hydrogen atoms are required to react with 3 atoms of Iron ? 3 Fe + 4 H2O --> Fe3O4 + 4 H2
Correct Answer
8Explanation
4 molecules of water are required to react with 3 atoms of iron. Each molecule of water contains two hydrogen atoms, so 4 x 2 = 8 Hydrogen atoms are required.Rate this question:
- 9.
How many Iron (Fe) atoms are there in 1 Iron Oxide (Fe3O4) molecule? 3 Fe + 4 H2O --> Fe3O4 + 4 H2
Correct Answer
3Explanation
The small number to the right of the element symbol represents the number of atoms.Rate this question:
- 10.
Which are the reactants in the following chemical reaction? 3 Fe + 4 H2O --> Fe3O4 + 4 H2 Iron + Water --> Iron Oxide + Hydrogen
- A.
Iron and Water
- B.
Iron Oxide and Hydrogen
Correct Answer
A. Iron and WaterExplanation
The reactants are the substances you start with that react together.
The products are the substances that the result of the reaction.Rate this question:
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- 11.
Which are the products in the following chemical reaction? 3 Fe + 4 H2O --> Fe3O4 + 4 H2 Iron + Water --> Iron Oxide + Hydrogen
- A.
Iron and Water
- B.
Iron Oxide and Hydrogen
Correct Answer
B. Iron Oxide and HydrogenExplanation
The reactants are the substances you start with that react together.
The products are the substances that the result of the reaction.Rate this question:
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- 12.
How many atoms of Oxygen in one atom of Sucrose?
Correct Answer
11Explanation
The number to the right of the element symbol represents the number of atoms in a molecule.Rate this question:
- 13.
What are the reactants in the following chemical equation? Fe + CuSO4 → FeSO4 + Cu
- A.
Fe +  CuSO4
- B.
FeSO4Â + Â Cu
Correct Answer
A. Fe +  CuSO4Explanation
In the given chemical equation, Fe (Iron) and CuSO4 (Copper(II) sulfate) are the reactants. Reactants are the substances that undergo a chemical reaction and are present at the beginning of the reaction. In this equation, Fe reacts with CuSO4 to form FeSO4 and Cu.Rate this question:
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- 14.
What are the products in the following chemical equation? Fe + CuSO4 → FeSO4 + Cu
- A.
Fe +  CuSO4
- B.
FeSO4Â + Â Cu
Correct Answer
B. FeSO4Â + Â CuExplanation
In the given chemical equation, Fe (iron) reacts with CuSO4 (copper sulfate) to form FeSO4 (iron sulfate) and Cu (copper). Therefore, the products in the chemical equation are FeSO4 and Cu.Rate this question:
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- 15.
Complete the following equation: Calcium and Chlorine --> Calcium ___________
Correct Answer
ChlorideExplanation
Assume from the format of the equation that Calcium and Chlorine will react together.
When Chlorine is combined with other substances it is often called Chloride. Similarly Fluorine is called flouride and Oxgen is called oxide.Rate this question:
- 16.
Complete the following equation: Magnesium and Chlorine --> Magnesium ___________
Correct Answer
ChlorideExplanation
Assume from the format of the equation that Magnesium and Chlorine will react together.
When Chlorine is combined with other substances it is often called Chloride. Similarly Fluorine is called flouride and Oxgen is called oxide.Rate this question:
- 17.
Complete the following equation: Magnesium and Oxygen --> Magnesium ___________
Correct Answer
OxideExplanation
Assume from the format of the equation that Magnesium and Oxygen will react together.
When Chlorine is combined with other substances it is often called Chloride. Similarly Fluorine is called flouride and Oxgen is called oxide.Rate this question:
- 18.
What elements are present in the following substance: CaCO3
Correct Answer
Calcium, Carbon and OxygenExplanation
The substance CaCO3 represents calcium carbonate, which consists of the elements calcium, carbon, and oxygen. Calcium is a metal, while carbon and oxygen are non-metals. This compound is commonly found in nature as limestone, marble, and chalk, and it is also an important component of shells, coral reefs, and pearls.Rate this question:
- 19.
What is the following substance called: CaCO3
Correct Answer
Calcium CarbonateExplanation
The Calcium is straight forward. When Oxygen is combined with other elements, -ate is added to the elements name.Rate this question:
- 20.
What is the following substance called? Na2CO3
Correct Answer
Sodium CarbonateExplanation
-ate is added to an elements name to indicate it is bonded with oxygen.Rate this question:
- 21.
What elements make up the following substance ? Na2CO3
Correct Answer
Sodium Carbon and OxygenExplanation
-ate is added to an elements name to indicate it is bonded with oxygen.Rate this question:
- 22.
How many Oxygen atoms are there in TWO molecules of Sodium Carbonate ? Na2CO3
Correct Answer
6Explanation
three oxygen atoms in one molecule so six atoms in two moleculesRate this question:
- 23.
How many Oxygen atoms are there in ONE molecule of Sodium Carbonate ? Na2CO3
Correct Answer
3Explanation
There are three oxygen atoms in one molecule of sodium carbonate (Na2CO3).Rate this question:
- 24.
What elements are present in the substance HCl ?
Correct Answer
Hydrogen and ChlorineExplanation
HCl is the chemical formula for hydrochloric acid, which is a strong acid. It consists of hydrogen (H) and chlorine (Cl) atoms. Hydrogen is a nonmetal, while chlorine is a halogen. When they combine, they form a covalent bond, resulting in the formation of hydrochloric acid.Rate this question:
- 25.
What is the substance HCl called ?
Correct Answer
Hyrdogen Chloride OR Hydrochloric AcidExplanation
Hydrogen chloride (HCl) is a colorless gas that dissolves in water to form hydrochloric acid (HCl). Therefore, both hydrogen chloride and hydrochloric acid are correct names for the substance HCl.Rate this question:
- 26.
Complete the word equation below: Calcium Oxide + Hydrochloric Acid --> __________ Chloride + water
Correct Answer
CalciumExplanation
One way of working this out is just to use the principle that all elements in the reactants must be present in the product. Calcium is missing in the products.Rate this question:
- 27.
A spontaneous reaction :
- A.
Proceeds very rapidly
- B.
Proceeds very slowly
- C.
Proceeds until the fuel runs out
Correct Answer
C. Proceeds until the fuel runs outExplanation
A spontaneous reaction proceeds until the fuel runs out because it is a reaction that occurs without the need for an external energy source. In other words, the reaction is able to sustain itself as long as there is fuel available to react. Once the fuel is depleted, the reaction will no longer continue. This is in contrast to reactions that require an input of energy to occur, which would not be considered spontaneous reactions.Rate this question:
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- 28.
Some spontaneous reactions require a kick-start of energy while others do not.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Some spontaneouse reactions do require a kick-start of energy (eg heat) to get them going, but then the reaction itself generates enough energy to keep the reaction going until the fuel runs out. Eg A sparklerRate this question:
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- 29.
A sparkler is NOT an example of a spontaneous reaction because it requires a kick start of energy in the form of a match to start the reaction.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Its all in the definition. The definition a spontaneouse reactions includes those that do require a kick-start of energy (eg heat) to get them going, but then the reaction itself generates enough energy to keep the reaction going until the fuel runs out. So a sparkler is regarded as being a spontaneouse reaction.Rate this question:
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- 30.
A non-spontaneous reaction requires a constant input of energy (eg heat) to keep the reaction going.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In a non-spontaneous reaction, the products have a higher energy level than the reactants. Therefore, energy must be continuously supplied to the reaction in order to overcome the energy barrier and keep the reaction going. This constant input of energy, such as heat, is required to drive the reaction in the forward direction. Without this constant energy input, the reaction would not proceed and would eventually come to a halt.Rate this question:
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- 31.
Galvanised iron has had a layer of zinc (or zinc and aluminium) applied to the iron in order to prevent rusting.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
True. When Zinc and aluminium react with Oxygen, they tend to form a protective layer. In contrast, when iron reacts with oxygen it tends to flake off, exposing fresh iron underneath so the rusting continues.Rate this question:
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- 32.
When natural gas, methane (CH4), is burnt in oxygen gas (O2), it produces carbon dioxide (CO2) and water (H2O). Write a word equation for this reaction.
Correct Answer
Methane + Oxygen --> Carbon Dioxide and WaterExplanation
The given word equation accurately represents the reaction between methane and oxygen gas. When methane is burnt in the presence of oxygen, it reacts to form carbon dioxide and water. This reaction is a combustion reaction, where the methane serves as the fuel and oxygen acts as the oxidizing agent. The resulting products are carbon dioxide, which is a greenhouse gas, and water, which is a byproduct of the combustion process.Rate this question:
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Feb 23, 2023Quiz Edited by
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Oct 17, 2012Quiz Created by
Dougal Morrison
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