Cchs MS Watson's Gc Chapter 8
- 1.
Lets say you mix a Solution A, which is already yellow, and a solution B, which is already yellow as well. After you mix them, the solution is still yellow. What can you conclude?
- A.
A precipitate formed
- B.
You can't conclude that a chemical reaction has occurred because there was no color change
- C.
A chemical reaction occurred because there was no color change.
- D.
Water has to be a reactant
Correct Answer
B. You can't conclude that a chemical reaction has occurred because there was no color changeExplanation
The fact that the solution remains yellow after mixing two yellow solutions indicates that there was no color change. Color change is often an indication of a chemical reaction taking place. However, in this case, since there is no color change, it cannot be concluded that a chemical reaction has occurred. The absence of a color change suggests that the two solutions are compatible and do not react with each other.Rate this question:
-
- 2.
Magnesium + Water --> Magnesium Hydroxide and Hydrogen Gas. What is a product (P) and what is a reactant (R)?
- A.
P= Magnesium Hydroxide R= Water
- B.
P= Magnesium R= Water
- C.
P= Hydrogen gas R= Magnesium Hydroxide
- D.
P= water R= Magnesium
Correct Answer
A. P= Magnesium Hydroxide R= WaterExplanation
In this reaction, magnesium reacts with water to form magnesium hydroxide and hydrogen gas. The product (P) is magnesium hydroxide because it is formed as a result of the reaction. The reactant (R) is water because it is the substance that reacts with magnesium to produce the product.Rate this question:
-
- 3.
How can you tell if a chemical equation is balanced?
- A.
If it has the same states of matter on both sides
- B.
Coefficients must add up to be equal on both sides
- C.
The subscripts are the same on both the products and reactants
- D.
The number of atoms on the product side and reactant side are the same
Correct Answer
D. The number of atoms on the product side and reactant side are the sameExplanation
If the number of atoms on the product side and reactant side are the same, it indicates that the chemical equation is balanced. Balancing a chemical equation involves ensuring that the number of atoms of each element is equal on both sides of the equation. This is important because it reflects the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. By balancing the equation, it shows that the same number of atoms are present before and after the reaction, maintaining the overall mass of the system.Rate this question:
-
- 4.
What is in a correctly written chemical equation?
- A.
The states of matter of the reactants and products
- B.
The correct chemical formulas of the reactants and products
- C.
The amounts of reactants and products
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
A correctly written chemical equation includes the states of matter of the reactants and products, the correct chemical formulas of the reactants and products, and the amounts of reactants and products. This means that all of these components are necessary for a chemical equation to be considered correct.Rate this question:
-
- 5.
What are coefficients used for?
- A.
To indicate that a synthesis reaction has occurred.
- B.
To indicate what disappears
- C.
To balance the equation
- D.
To indicate the states of matter
Correct Answer
C. To balance the equationExplanation
Coefficients are used to balance an equation. In a chemical equation, coefficients represent the number of molecules or atoms involved in the reaction. Balancing the equation ensures that the number of atoms on both sides of the equation is equal, satisfying the law of conservation of mass. By adjusting the coefficients, the equation can be balanced, meaning that the same number of atoms of each element is present on both sides of the equation. This is important to accurately represent the reaction and its stoichiometry.Rate this question:
-
- 6.
The formation of a gaseous product is indicated by the symbol:
- A.
(s)
- B.
(g)
- C.
(vap)
- D.
(l)
Correct Answer
B. (g)Explanation
The symbol (g) is used to indicate the formation of a gaseous product. It signifies that the substance is in the gas phase. This symbol is commonly used in chemical equations to indicate the state of the product. In contrast, (s) is used for solids, (vap) is used for vapors, and (l) is used for liquids.Rate this question:
-
- 7.
2NaNO3 What is the coefficient, and what is the subscript?
- A.
3, there are no coefficients
- B.
2, there are no subscripts
- C.
3, 2
- D.
2, 3
Correct Answer
D. 2, 3Explanation
The correct answer is 2, 3. In the chemical formula 2NaNO3, the coefficient is 2, indicating that there are two molecules of NaNO3. The subscript is 3, indicating that there are three atoms of oxygen in each molecule of NaNO3.Rate this question:
-
- 8.
How many molecules are represented by this: 4H2O
- A.
4
- B.
3
- C.
2
- D.
1
Correct Answer
A. 4Explanation
The chemical formula 4H2O represents four molecules of water. Each molecule of water consists of two hydrogen atoms bonded to one oxygen atom. Therefore, multiplying the number of water molecules (H2O) by 4 gives us a total of four water molecules.Rate this question:
-
- 9.
How many molecules are on the reactants side in this: Nh4NO2 --> N2 + 2H2O
- A.
2
- B.
1
- C.
3
- D.
4
Correct Answer
B. 1Explanation
In the given chemical equation, Nh4NO2 decomposes to form N2 and 2H2O. The reactant side consists of only one molecule, which is Nh4NO2. Therefore, the correct answer is 1.Rate this question:
-
- 10.
How many molecules are on the products side in this: Nh4NO2 --> N2 + 2H2O
- A.
4
- B.
1
- C.
2
- D.
3
Correct Answer
D. 3Explanation
In the given chemical equation, Nh4NO2 decomposes to form N2 and 2H2O. This means that one molecule of Nh4NO2 produces one molecule of N2 and two molecules of H2O. Therefore, there are a total of three molecules on the products side of the equation.Rate this question:
-
- 11.
Is this equation balanced?2Fe+ O2 --> Fe2O3
- A.
Sometimes
- B.
Yes
- C.
No
- D.
Maybe
Correct Answer
C. NoExplanation
The equation is not balanced because the number of atoms of each element is not equal on both sides of the equation. On the left side, there are 2 iron (Fe) atoms and 2 oxygen (O) atoms, while on the right side, there are 2 iron (Fe) atoms and 3 oxygen (O) atoms. To balance the equation, we need to adjust the coefficients in front of each compound so that the number of atoms of each element is the same on both sides.Rate this question:
-
- 12.
Is this equation balanced?4H2+ 2O2 --> 2H2O
- A.
Yes
- B.
This option doesn't matter
- C.
This option doesnt matter
- D.
No
Correct Answer
D. NoExplanation
The equation is not balanced because the number of hydrogen atoms on both sides of the equation is not equal. On the left side, there are 4 hydrogen atoms, while on the right side, there are only 2 hydrogen atoms. In order for the equation to be balanced, the number of atoms of each element must be the same on both sides.Rate this question:
-
- 13.
What type of reaction forms one product from two or more compounds?
- A.
A +BX -> AX +B
- B.
AX+ BC-> AC+ BX
- C.
A+X-> AX
- D.
AX-> A + X
Correct Answer
C. A+X-> AXExplanation
The correct answer is A+X-> AX. This reaction represents a synthesis reaction, where two or more compounds combine to form a single product. In this case, compound A reacts with compound X to form compound AX.Rate this question:
-
- 14.
What is the general formula for a double displacement reaction?
- A.
A+ B -> AB
- B.
AX+BY-> AY + BX
- C.
AB+ CS -> ABCS
- D.
AB-> A + B
Correct Answer
B. AX+BY-> AY + BXExplanation
The general formula for a double displacement reaction is AX + BY -> AY + BX. In this type of reaction, the cations of two different compounds switch places with each other, resulting in the formation of two new compounds. The reactants AX and BY combine to form the products AY and BX. This type of reaction is also known as a metathesis reaction or a precipitation reaction, as it often involves the formation of a precipitate when two aqueous solutions are mixed together.Rate this question:
-
- 15.
In what type of reaction may a precipitate form, and there are two products?
- A.
Combustion
- B.
Synthesis
- C.
Single Displacement
- D.
Double Displacement
Correct Answer
D. Double DisplacementExplanation
In a double displacement reaction, two compounds react and exchange ions, resulting in the formation of two new compounds. This type of reaction often occurs in aqueous solutions and can result in the formation of a precipitate, which is an insoluble solid that forms when two solutions are mixed. Therefore, in a double displacement reaction, a precipitate may form, and there are two products.Rate this question:
-
- 16.
In What movie are potatoes grown from an plant chemist using the combustion of hydrogen and oxygen?
- A.
Zootopia
- B.
Interstellar
- C.
The Martian
- D.
Apollo 13
Correct Answer
C. The MartianExplanation
In the movie "The Martian," potatoes are grown by a plant chemist using the combustion of hydrogen and oxygen. This means that the character in the movie uses a chemical reaction involving hydrogen and oxygen to create the necessary conditions for growing potatoes.Rate this question:
-
- 17.
When we burn gasoline, or propane what type of chemical reaction is occuring?
- A.
Fire
- B.
Combustion
- C.
Synthesis
- D.
Decomposition
Correct Answer
B. CombustionExplanation
When we burn gasoline or propane, a chemical reaction called combustion occurs. Combustion is a type of exothermic reaction where a fuel combines with oxygen in the presence of heat to produce carbon dioxide, water, and heat energy. In this case, the gasoline or propane acts as the fuel, and when it reacts with oxygen, it releases energy in the form of heat and light, resulting in fire. Therefore, combustion is the correct answer for the given question.Rate this question:
-
- 18.
What is the only type of reaction that can occur if you have these reactants?2HCl + Cr -->
- A.
Double Displacement
- B.
Composition
- C.
Synthesis
- D.
Single Replacement
Correct Answer
D. Single ReplacementExplanation
The given reactants 2HCl + Cr indicate a single replacement reaction. In a single replacement reaction, one element replaces another element in a compound. Here, the chlorine in HCl is replaced by the chromium (Cr) atom. Therefore, the correct answer is Single Replacement.Rate this question:
-
- 19.
If I have a compound X and it reacts to form compound Y and Z, what type of reaction is this?
- A.
Decomposition
- B.
Composition
- C.
Synthesis
- D.
X>Y>Z
Correct Answer
A. DecompositionExplanation
The given reaction describes the compound X breaking down into compounds Y and Z. This is characteristic of a decomposition reaction, where a single compound breaks down into two or more simpler substances.Rate this question:
-
- 20.
In a single displacement reaction, how can you tell if the reaction will occur?
- A.
Consult you activity series, if the single element is above the first element in the other compound , the reaction will occur
- B.
Consult you activity series, if the single element reacts with water above 100 degrees celsius then it will occur.
- C.
Consult you activity series, if the single element is below the first element in the other compound , the reaction will occur
- D.
Consult you activity series, if the single element is next to HCL, then the reaction will proceed.
Correct Answer
A. Consult you activity series, if the single element is above the first element in the other compound , the reaction will occurExplanation
The correct answer is to consult the activity series and check if the single element is above the first element in the other compound. This is because the activity series is a list of metals and nonmetals arranged in order of their reactivity. If the single element is above the first element in the other compound, it means that it is more reactive and will displace the first element to form a new compound. Therefore, the reaction will occur.Rate this question:
-
- 21.
What does the symbol (aq) represent?
- A.
Marine life
- B.
Gaseous
- C.
Aqueous
- D.
Liquid
Correct Answer
C. AqueousExplanation
The symbol (aq) represents the term "aqueous." Aqueous refers to a solution in which a substance is dissolved in water. It indicates that the substance is in a liquid state and is dissolved in water.Rate this question:
-
- 22.
If element X reacts with Zinc Chloride, what can be said?
- A.
Its hard to say
- B.
Zinc is lower on the activity series than X
- C.
Zinc is higher on the activity series than X
- D.
X is lower on the activity series than Zinc
Correct Answer
B. Zinc is lower on the activity series than XExplanation
This answer suggests that Zinc is lower on the activity series than element X. The activity series is a list of metals arranged in order of their reactivity, with the most reactive metals at the top. If Zinc is lower on the activity series than X, it means that X is more reactive than Zinc and is likely to displace Zinc in a chemical reaction.Rate this question:
-
- 23.
A + BX --> AX + B is what type of reaction?
- A.
Combustion
- B.
Double replacement
- C.
Half synthesis
- D.
Single displacement
Correct Answer
D. Single displacementExplanation
In a single displacement reaction, one element is replaced by another element in a compound. In the given reaction, the element A is being replaced by the element B in the compound BX, resulting in the formation of compound AX and the release of element B. Therefore, the given reaction is a single displacement reaction.Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Mar 14, 2023Quiz Edited by
ProProfs Editorial Team -
Mar 09, 2017Quiz Created by
CCHSBaCoN
Back to top