Classification Of Chemical Reactions Quiz
Can you answer all these questions on chemical reactions? Test your knowledge on this science quiz to see how you do and compare your score to others.
Questions and Answers
- 1.
What characteristic of copper allows it to be made into copper wire?
- A.
It is magnetic
- B.
It is dense
- C.
It is soluble
- D.
It is ductile
Correct Answer
D. It is ductileExplanation
Copper can be made into copper wire because it is ductile. Ductility is the ability of a material to be stretched into a wire without breaking. Copper has high ductility, which means it can be easily drawn into thin wires without losing its structural integrity. This property makes copper an ideal choice for electrical wiring applications, as it can be easily shaped and manipulated into the desired form.Rate this question:
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- 2.
Which pure substance is only composed of one element?
- A.
Carbon
- B.
Gold
- C.
Water
- D.
Sodium
Correct Answer
C. Water -
- 3.
After a chemical reaction occurs in an open test tube, measurements indicate that the mass of the reactants is greater than the mass of the products remaining in the test tube. What most likely explains the measurements?
- A.
A solid was produced
- B.
A gas was produced
- C.
The salinity of the reactants was high
- D.
The temperature of the products was low
Correct Answer
B. A gas was producedExplanation
The most likely explanation for the measurements indicating that the mass of the reactants is greater than the mass of the products remaining in the test tube is that a gas was produced during the chemical reaction. Gases have mass, but they are not contained within the test tube, which could result in a decrease in the overall mass of the products.Rate this question:
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- 4.
Which is the best way to determine if an object is made of pure silver?
- A.
Determine the solubility of the object
- B.
Test to see if the object is chemically reactive
- C.
Determine the density of the object and compare the known density of pure silver
- D.
Compare the mass of the silver object to the mass of a piece of pure silver
Correct Answer
C. Determine the density of the object and compare the known density of pure silverExplanation
To determine if an object is made of pure silver, the best way is to determine the density of the object and compare it to the known density of pure silver. This is because pure silver has a specific density, so if the object has the same density as pure silver, it is likely made of pure silver. This method is reliable because it is based on a specific property of the material being tested.Rate this question:
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- 5.
Which element is a poor conductor of heat?
- A.
F
- B.
K
- C.
Fe
- D.
Ag
Correct Answer
C. FeExplanation
Fe (Iron) is a poor conductor of heat because it has a relatively low thermal conductivity compared to other elements. This is due to its atomic structure and the arrangement of its electrons. Iron has a high electrical conductivity, but its thermal conductivity is lower because it does not allow heat to transfer easily through its lattice structure. As a result, Fe is commonly used as a thermal insulator in various applications.Rate this question:
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- 6.
Chemical X has a mass of 5 grams, and chemical Y has a mass of 10 grams. If the two chemicals are mixed and a complete chemical reaction takes place, what is most likely the mass of the product?
- A.
5 grams
- B.
10 grams
- C.
15 grams
- D.
50 grams
Correct Answer
C. 15 gramsExplanation
When chemical X with a mass of 5 grams and chemical Y with a mass of 10 grams are mixed and undergo a complete chemical reaction, the most likely mass of the product is 15 grams. This is because in a chemical reaction, the total mass of the reactants is conserved and is equal to the total mass of the products. Therefore, the sum of the masses of chemical X and chemical Y (5 grams + 10 grams = 15 grams) is likely to be the mass of the product.Rate this question:
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- 7.
How can a scientist, using the periodic table, find an element with properties similar to another element?
- A.
By comparing density
- B.
By finding its periodic group
- C.
By comparing its atomic weight
- D.
By comparing malleability
Correct Answer
B. By finding its periodic groupExplanation
A scientist can find an element with properties similar to another element by finding its periodic group. The periodic table is organized into groups or families, which contain elements with similar chemical properties. Elements in the same group have the same number of valence electrons, which determines their reactivity and chemical behavior. Therefore, by identifying the periodic group of an element, a scientist can determine if it shares similar properties with another element in the same group.Rate this question:
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- 8.
Which of the following is an example of a physical change?
- A.
Boiling
- B.
Rusting
- C.
Burning
- D.
Rotting
Correct Answer
A. BoilingExplanation
Boiling is an example of a physical change because it involves the change in the state of a substance from a liquid to a gas, without altering its chemical composition. In this process, heat is applied to the substance, causing the molecules to gain energy and move faster, eventually breaking the intermolecular forces and forming a gas. This change is reversible, as the gas can be cooled down to condense back into a liquid state.Rate this question:
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- 9.
Which terms explain how elements combine in different ways to produce compounds?
- A.
Protons and neutrons
- B.
Exothermic and endothermic
- C.
Atomic mass and atomic number
- D.
Ionic and covalent bonding
Correct Answer
D. Ionic and covalent bondingExplanation
Ionic and covalent bonding are terms that explain how elements combine in different ways to produce compounds. Ionic bonding occurs when one element transfers electrons to another element, resulting in the formation of ions with opposite charges that attract each other. Covalent bonding, on the other hand, occurs when elements share electrons to achieve a stable electron configuration. These two types of bonding are fundamental in understanding the different ways elements can combine and form compounds.Rate this question:
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- 10.
When chemically combined with other elements, what happens to the original element?
- A.
It retains its original properties
- B.
It develops a new set of properties
- C.
It becomes a mixture
- D.
It becomes a solution
Correct Answer
B. It develops a new set of propertiesExplanation
When an element is chemically combined with other elements, it undergoes a chemical reaction that leads to the formation of a compound. During this process, the original element loses its original properties and forms a new set of properties in the compound. This is because the atoms of the original element rearrange and bond with atoms of other elements, resulting in the formation of new chemical bonds and a different chemical composition. As a result, the compound formed will have its own unique set of properties that are different from the original element.Rate this question:
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- 11.
If an atom has one electron in its outermost shell, how will the atom most likely combine with other atoms?
- A.
By gaining electrons
- B.
By sharing electrons
- C.
By losing electrons
- D.
By moving electrons
Correct Answer
C. By losing electronsExplanation
When an atom has only one electron in its outermost shell, it is more likely to combine with other atoms by losing electrons. This is because atoms tend to gain or lose electrons in order to achieve a stable electron configuration, typically with a full outer shell. By losing its single outer electron, the atom can achieve a stable configuration and form a bond with another atom that can accept this electron. This process is known as ionization and leads to the formation of positive ions.Rate this question:
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- 12.
Reactant X has a mass of 20 grams. The product of Reactant X and Y has a mass of 50 grams. What is the mass of Reactant Y?
- A.
20 grams
- B.
30 grams
- C.
70 grams
- D.
150 grams
Correct Answer
B. 30 gramsExplanation
Based on the information provided, Reactant X has a mass of 20 grams and the product of Reactant X and Y has a mass of 50 grams. To find the mass of Reactant Y, we subtract the mass of Reactant X from the mass of the product. 50 grams - 20 grams = 30 grams. Therefore, the mass of Reactant Y is 30 grams.Rate this question:
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- 13.
A chemical reaction takes place when one atom of oxygen combines with two atoms of hydrogen. What would be the result of that reaction?
- A.
Water is produced
- B.
Oxygen is released
- C.
Reactants are formed
- D.
Hydrogen and oxygen are formed
Correct Answer
A. Water is producedExplanation
When one atom of oxygen combines with two atoms of hydrogen, a chemical reaction occurs resulting in the production of water. This is because the atoms of oxygen and hydrogen bond together to form water molecules, which consist of two hydrogen atoms and one oxygen atom.Rate this question:
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- 14.
If a chemical reaction started with 10 times the amount of oxygen and hydrogen atoms shown, which would support the law of conservation of matter? 2H2 + O2 → 2H2O
- A.
There would be 20 times more water produced
- B.
There would be 10 times more water produced
- C.
The chemical reaction would have the same number of products produced
- D.
Matter would remain in the same physical state throughout the reaction
Correct Answer
B. There would be 10 times more water producedExplanation
If a chemical reaction started with 10 times the amount of oxygen and hydrogen atoms shown, there would be 10 times more water produced. This supports the law of conservation of matter because the total number of atoms on both sides of the reaction remains the same. By increasing the amount of reactants, the amount of products also increases proportionally, maintaining the balance of atoms.Rate this question:
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- 15.
Which best supports the law of conservation of matter?
- A.
There is a different number of atoms on each side of the reaction
- B.
There is a different number of compounds on each side of a chemical equation
- C.
There are the same number of each element on each side of the reaction
- D.
There are the same number of oxygen atoms on each side of the reaction
Correct Answer
C. There are the same number of each element on each side of the reactionExplanation
The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction, only rearranged. This means that the total number of atoms of each element must be the same on both sides of the reaction. Therefore, the answer "There are the same number of each element on each side of the reaction" supports the law of conservation of matter.Rate this question:
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- 16.
Each element on the periodic table has a different atomic number. What does this number represent?
- A.
The number of protons
- B.
The number of neutrons
- C.
The half-life
- D.
The chemical symbol
Correct Answer
A. The number of protonsExplanation
The atomic number represents the number of protons in an atom. Protons are positively charged particles found in the nucleus of an atom. Each element has a unique number of protons, which determines its identity and place on the periodic table. The number of neutrons and half-life are not represented by the atomic number. The chemical symbol is a shorthand representation of an element's name and is not directly related to the atomic number.Rate this question:
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- 17.
The majority of the elements on the periodic table are classified as _____________________
- A.
Liquids
- B.
Nonmetals
- C.
Metalloids
- D.
Metals
Correct Answer
D. MetalsExplanation
The majority of the elements on the periodic table are classified as metals because they possess certain characteristics such as being good conductors of heat and electricity, having high melting and boiling points, and being malleable and ductile. These properties make metals suitable for various industrial and technological applications. Additionally, metals tend to lose electrons easily, forming positive ions, and are found on the left side of the periodic table.Rate this question:
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- 18.
What is the relationship between elements with 6, 14, and 82 protons in their nuclei on the periodic table of elements?
- A.
They are in the same group
- B.
They are in the same period
- C.
They have the same atomic mass
- D.
They have the same atomic number
Correct Answer
A. They are in the same groupExplanation
The elements with 6, 14, and 82 protons in their nuclei are in the same group on the periodic table of elements. This means that they have similar chemical properties and react in similar ways with other elements. The group number indicates the number of valence electrons, which determines the element's reactivity and bonding behavior. Therefore, elements in the same group have similar characteristics and tend to exhibit similar chemical behavior.Rate this question:
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- 19.
If a highly reactive metal with 1 valence electron is discovered, in which group would the element best fit?
- A.
Group 1
- B.
Group 2
- C.
Group 17
- D.
Group 18
Correct Answer
A. Group 1Explanation
A highly reactive metal with 1 valence electron would best fit in Group 1. Group 1 elements, also known as alkali metals, have 1 valence electron and are highly reactive due to their low ionization energy. These metals readily lose their valence electron to form a positive ion, making them highly reactive with other elements. Therefore, a highly reactive metal with 1 valence electron would belong to Group 1.Rate this question:
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- 20.
An unknown element is being studied in a lab. The element is nonreactive, but only has two valence electrons. Which element is being studied?
- A.
Neon (Ne)
- B.
Oxygen (O)
- C.
Helium (He)
- D.
Hydrogen (H)
Correct Answer
C. Helium (He)Explanation
Helium is the correct answer because it is a nonreactive element with two valence electrons. Helium is located in the noble gas group on the periodic table, which means it has a full outer electron shell and is stable. This stability is why helium does not readily react with other elements. Neon, oxygen, and hydrogen all have different numbers of valence electrons and therefore do not fit the description given in the question.Rate this question:
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- 21.
Understanding Element Organization 5 Atomic # B Chemical Symbol 10.81 Atomic Mass Using the information above, answer the following question. Which element is shown?
- A.
Boron
- B.
Barium
- C.
Beryllium
- D.
Bromine
Correct Answer
A. BoronExplanation
The information provided in the table includes the atomic number, chemical symbol, and atomic mass of an element. The chemical symbol "B" corresponds to the element Boron, which has an atomic number of 5 and an atomic mass of 10.81. Therefore, the correct answer is Boron.Rate this question:
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- 22.
Understanding Element Organization 5 Atomic # B Chemical Symbol 10.81 Atomic Mass Using the information above, answer the following question. What is the relationship between the atomic # and the # of protons?
- A.
The two numbers have opposite signs
- B.
The two numbers are the same
- C.
The two numbers have no relationship
- D.
The two numbers have a product of 100
Correct Answer
B. The two numbers are the sameExplanation
The atomic number of an element represents the number of protons in the nucleus of an atom. Therefore, the relationship between the atomic number and the number of protons is that they are the same.Rate this question:
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- 23.
Based on the periodic table, which best describes the characteristics of an element located at the far right of the table?
- A.
Gas, and a good conductor of heat and electricity
- B.
Gas, and a poor conductor of heat and electricity
- C.
Ductile, and a semi-conductor of heat and electricity
- D.
Malleable, ductile, and a good conductor of heat and electricity
Correct Answer
B. Gas, and a poor conductor of heat and electricityExplanation
The element located at the far right of the periodic table is a gas, as most of the elements in that region are gases. Additionally, it is a poor conductor of heat and electricity. This is because elements on the right side of the periodic table tend to have high ionization energies and electronegativities, which make it difficult for them to conduct heat and electricity effectively.Rate this question:
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- 24.
Which description would be evidence that a chemical change has taken place?
- A.
Water vapor surrounds a melting ice cube.
- B.
Adding heat to water causes the water to boil.
- C.
Gas bubbles form when a substance is put into water.
- D.
Adding food coloring to water causes the water to change color.
Correct Answer
C. Gas bubbles form when a substance is put into water.Explanation
Gas bubbles form when a substance is put into water is evidence that a chemical change has taken place. This is because the formation of gas bubbles indicates the release of a gas, which is a characteristic of a chemical reaction. The interaction between the substance and water has caused a chemical reaction to occur, resulting in the formation of gas bubbles.Rate this question:
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- 25.
Which element has 7 valence electrons?
- A.
Nitrogen
- B.
Lead
- C.
Hydrogen
- D.
Flourine
Correct Answer
D. FlourineExplanation
Fluorine has 7 valence electrons. Valence electrons are the electrons in the outermost energy level of an atom that are involved in chemical reactions. Fluorine is in Group 17 of the periodic table, which means it has 7 electrons in its outermost energy level.Rate this question:
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- 26.
A solid formed in a chemical reaction is called a(n)
- A.
Exothermic
- B.
Precipitate
- C.
Ion
- D.
Covalent
Correct Answer
B. PrecipitateExplanation
A solid formed in a chemical reaction is called a precipitate. This occurs when two or more substances react and produce an insoluble solid that separates from the solution. The formation of a precipitate is a common occurrence in many chemical reactions, especially those involving ionic compounds. The solid precipitate can be easily separated from the solution through filtration or decantation.Rate this question:
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- 27.
Which of the following is not a type of chemical bond?
- A.
Ionic
- B.
Precipitate
- C.
Metallic
- D.
Covalent
Correct Answer
B. PrecipitateExplanation
A precipitate is not a type of chemical bond. It refers to a solid that forms when two aqueous solutions react chemically with each other, resulting in the formation of an insoluble product. In contrast, ionic, metallic, and covalent bonds are all types of chemical bonds that involve the sharing or transfer of electrons between atoms.Rate this question:
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- 28.
A type of reaction in which there is a temperature change and the substance gets hot is known as a(n) _______________
- A.
Ionic
- B.
Covalent
- C.
Endothermic
- D.
Exothermic
Correct Answer
D. ExothermicExplanation
An exothermic reaction is a type of reaction in which there is a temperature change and the substance gets hot. In an exothermic reaction, energy is released in the form of heat. This is the opposite of an endothermic reaction, where energy is absorbed from the surroundings, causing the substance to become cooler. Ionic and covalent refer to the types of chemical bonds, and do not necessarily indicate whether a reaction is exothermic or endothermic.Rate this question:
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- 29.
Ions, charged particles, are formed as a result of which type of bond?
- A.
Endothermic
- B.
Metallic
- C.
Ionic
- D.
Covalent
Correct Answer
C. IonicExplanation
Ions, which are charged particles, are formed as a result of an ionic bond. In an ionic bond, one atom transfers electrons to another atom, creating positive and negative ions. This transfer of electrons leads to the formation of a strong electrostatic attraction between the oppositely charged ions, creating a stable bond. This is different from covalent bonds, where atoms share electrons, and metallic bonds, where electrons are delocalized among a sea of atoms.Rate this question:
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- 30.
Which type of bond gives metal the ability to be flexible, malleable, and ductile?
- A.
Ionic
- B.
Covalent
- C.
Metallic
- D.
Endothermic
Correct Answer
C. MetallicExplanation
Metallic bonds give metals the ability to be flexible, malleable, and ductile. In metallic bonding, the valence electrons are delocalized and free to move throughout the metal lattice, creating a "sea" of electrons. This allows the metal atoms to slide past each other easily, making the metal flexible. The delocalized electrons also contribute to the metal's ability to conduct electricity and heat. Additionally, the delocalized electrons give the metal its malleability and ductility, as they can be easily rearranged without breaking the bond between the metal atoms.Rate this question:
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- 31.
Please balance the following. Your answer choices will put the coefficients in the order that they appear in the equation. Zn + HCl ---> ZnCl2 + H2
- A.
2Zn + 1HCl ---> 1ZnCl2 + 2H2
- B.
1Zn + 2HCl ---> 1ZnCl2 + 1H2
- C.
2Zn + 2HCl ---> 4ZnCl2 + 1H2
- D.
1Zn + 1HCl ---> 1ZnCl2 + 1H2
Correct Answer
B. 1Zn + 2HCl ---> 1ZnCl2 + 1H2Explanation
The balanced equation for the reaction between zinc (Zn) and hydrochloric acid (HCl) is 1Zn + 2HCl ---> 1ZnCl2 + 1H2. This equation is balanced because it has an equal number of atoms of each element on both sides of the equation. There is 1 zinc atom (Zn) and 2 hydrogen atoms (H) on the left side, and 1 zinc chloride molecule (ZnCl2) and 1 hydrogen molecule (H2) on the right side. Therefore, this equation represents the correct stoichiometry of the reaction.Rate this question:
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- 32.
Please balance the following. Your answer choices will put the coefficients in the order that they appear in the equation. C5H12 + O2 ---> CO2 + H2O
- A.
4C5H12 + 3O2 ---> 20CO2 + 2H2O
- B.
1C5H12 + 1O2 ---> 5CO2 + H2O
- C.
1C5H12 + 8O2 ---> 5CO2 + 6H2O
- D.
3C5H12 + 2O2 ---> 4CO2 + 1H2O
Correct Answer
C. 1C5H12 + 8O2 ---> 5CO2 + 6H2OExplanation
The balanced equation shows that for every 1 molecule of C5H12, 8 molecules of O2 are required to produce 5 molecules of CO2 and 6 molecules of H2O. This is determined by the stoichiometric coefficients in the balanced equation. The other answer choices do not have the correct ratio of reactants and products, therefore they are not balanced.Rate this question:
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- 33.
What type of reaction is showed in the following example: Zn + HCl ---> ZnCl2 + H2
- A.
Synthesis
- B.
Decomposition
- C.
Single Displacement
- D.
Double Displacement
Correct Answer
C. Single DisplacementExplanation
The reaction shown in the example is a single displacement reaction. In this type of reaction, one element replaces another element in a compound. In the given reaction, zinc (Zn) displaces hydrogen (H) in hydrochloric acid (HCl) to form zinc chloride (ZnCl2) and hydrogen gas (H2). This is indicated by the change in the chemical equation, where Zn replaces H in the compound.Rate this question:
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- 34.
What type of reaction is shown in the following example: FeCl3 + NH4OH ---> Fe(OH)3 + NH4Cl
- A.
Synthesis
- B.
Decomposition
- C.
Single Displacement
- D.
Double Displacement
Correct Answer
D. Double DisplacementExplanation
The reaction shown in the example is a double displacement reaction. In this type of reaction, the cations and anions of two different compounds switch places, forming two new compounds. In this case, FeCl3 and NH4OH react to form Fe(OH)3 and NH4Cl. The Fe3+ ion from FeCl3 combines with the OH- ion from NH4OH to form Fe(OH)3, while the NH4+ ion from NH4OH combines with the Cl- ion from FeCl3 to form NH4Cl.Rate this question:
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- 35.
What type of reaction is shown in the following example: H2CO3--->H2O + CO2
- A.
Synthesis
- B.
Decomposition
- C.
Single Displacement
- D.
Double Displacement
Correct Answer
B. DecompositionExplanation
The reaction shown in the example is a decomposition reaction. In this type of reaction, a compound breaks down into simpler substances. In the given equation, H2CO3 (carbonic acid) decomposes into H2O (water) and CO2 (carbon dioxide).Rate this question:
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- 36.
What type of reaction is shown in the following example: 2Na + Cl2 ----> 2NaCl
- A.
Synthesis
- B.
Decomposition
- C.
Single Displacement
- D.
Double Displacement
Correct Answer
A. SynthesisExplanation
The given chemical equation represents a synthesis reaction. In a synthesis reaction, two or more substances combine to form a single compound. In this case, sodium (Na) reacts with chlorine (Cl2) to produce sodium chloride (NaCl). The reactants combine to form a new compound, which is the product.Rate this question:
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