Chapter 7 Quiz - Chemistry | Attempts: 372 - Trivia , Flashcards & Questions

2.

What is the term for the number in front of a chemical formula in a chemical equation?

Subscript
Superscript
Coefficient
Variable

Correct Answer

A. Coefficient

Explanation

The term for the number in front of a chemical formula in a chemical equation is called a coefficient. It represents the number of moles or molecules of a substance involved in the reaction. Coefficients are used to balance chemical equations by ensuring that the number of atoms on both sides of the equation is equal. Subscripts, on the other hand, are used to indicate the number of atoms of a specific element within a molecule, while superscripts are used for indicating the charge of an ion. Variables are symbols used to represent unknown quantities in mathematical equations.

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5

3.

What are the chemicals at the beginning of a reaction called?

Products
Reactants
Ionic compounds
Covalent compounds

Correct Answer

A. Reactants

Explanation

Reactants are the chemicals at the beginning of a reaction. They are the starting materials that undergo a chemical change to form products. In a chemical reaction, reactants are transformed into new substances through the breaking and forming of chemical bonds. Therefore, reactants play a crucial role in initiating and driving the reaction forward.

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4

4.

What are the chemicals that result from a chemical reaction called?

Products
Reactants
Ionic compounds
Covalent compounds

Correct Answer

A. Products

Explanation

Chemicals that result from a chemical reaction are called products. In a chemical reaction, reactants undergo a transformation and form new substances known as products. These products can have different physical and chemical properties compared to the reactants. The formation of products is a fundamental concept in chemistry and is crucial in understanding the changes that occur during chemical reactions.

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1

5.

A chemical reaction is represented by a ________.

Chemical formula
List of products
List of reactants
Chemical equation

Correct Answer

A. Chemical equation

Explanation

A chemical equation is used to represent a chemical reaction. It shows the reactants on the left side and the products on the right side, separated by an arrow. The chemical equation provides information about the substances involved in the reaction and their respective quantities. It allows scientists to understand the stoichiometry of the reaction, meaning the ratios in which the reactants combine and the products are formed. Therefore, a chemical equation is the most appropriate representation for a chemical reaction.

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2

6.

Which of the following compounds is a salt?

CO2
H2O
CaCO3
HCl

Correct Answer

A. CaCO3

Explanation

CaCO3 is a salt because it is composed of a metal ion (Ca2+) and a non-metal ion (CO32-). Salts are formed when a metal reacts with a non-metal, resulting in the transfer of electrons. In CaCO3, calcium (Ca) is a metal and carbonate (CO3) is a non-metal. Therefore, CaCO3 is a salt.

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2

7.

Electrolytes release _____________ when dissolved in water.

Ions
H atoms
Solids
Solute

Correct Answer

A. Ions

Explanation

When electrolytes are dissolved in water, they break down into ions. These ions are electrically charged particles that can conduct electricity. Therefore, the correct answer is "ions."

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8.

Name the following:

Correct Answer
magnesium carbonate

Explanation
Magnesium carbonate is the name of the compound being referred to in the question.

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2

9.

Name the following:

Correct Answer
trisulfur diphosphide

Explanation
Trisulfur diphosphide is the name of the compound represented by the chemical formula S3P2. The name is derived from the elements present in the compound. "Tri" indicates the presence of three sulfur atoms, and "di" indicates the presence of two phosphorus atoms. Therefore, the compound is named trisulfur diphosphide.

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10.

BaSO4 is soluble.

True
False

Correct Answer

A. False

Explanation

BaSO4, also known as barium sulfate, is generally considered insoluble in water. It has a very low solubility, meaning that only a small amount of BaSO4 can dissolve in water. This is due to the strong ionic bonds between the barium and sulfate ions in the compound. As a result, BaSO4 is often used as a contrast agent in medical imaging because it does not dissolve easily in the body. Therefore, the correct answer is False.

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11.

Silver nitrate is soluble.

True
False

Correct Answer

A. True

Explanation

Silver nitrate is soluble because it dissolves in water to form a solution. This is due to the ionic nature of silver nitrate, where the silver ion (Ag+) and nitrate ion (NO3-) dissociate in water. The water molecules surround and separate the ions, allowing them to move freely in the solution. Therefore, silver nitrate is considered soluble in water.

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12.

A precipitate is a(n) ____________ that results when a salt comes out of solution.

Liquid
Gas
Solid
Ion

Correct Answer

A. Solid

Explanation

When a salt comes out of solution, it forms a solid substance called a precipitate. A precipitate is formed when the salt molecules react with other molecules in the solution and create a new solid compound that is insoluble and separates from the liquid. Therefore, the correct answer is solid.

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13.

Lithium hydroxide is soluble.

True
False

Correct Answer

A. True

Explanation

Lithium hydroxide is soluble because it dissolves in water to form lithium ions (Li+) and hydroxide ions (OH-). This compound is classified as a strong base, meaning it readily dissociates in water. Solubility is a property that describes the ability of a substance to dissolve in a solvent, and in the case of lithium hydroxide, it readily dissolves in water, making it soluble.

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14.

Silver hydroxide is soluble.

True
False

Correct Answer

A. False

Explanation

Silver hydroxide is not soluble in water. This is because silver hydroxide is a weak base and has low solubility in water. It forms a precipitate when dissolved in water, indicating that it is insoluble.

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15.

Calcium carbonate is soluble.

True
False

Correct Answer

A. False

Explanation

Calcium carbonate is insoluble in water. This means that it does not readily dissolve or mix with water. Instead, it forms a solid precipitate when calcium ions and carbonate ions come together. This can be observed in nature, such as in the formation of limestone and marble. Additionally, calcium carbonate is commonly used in antacid medications because it can neutralize excess stomach acid.

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16.

The symbol aq means ______.

Aqueous
Equal
Adequate
None of the above.

Correct Answer

A. Aqueous

Explanation

The symbol "aq" is used to represent the term "aqueous" in chemistry. Aqueous refers to a solution in which water is the solvent. It is commonly used to indicate that a substance is dissolved in water. Therefore, the correct answer is "aqueous."

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17.

Fill in the blanks:

1, 1, 1, 1
2, 1, 2, 1
1, 2, 1, 2
1, 2, 2, 1

Correct Answer

A. 1, 1, 1, 1

Explanation

The given sequence follows a pattern where each row consists of alternating numbers. The first row has all 1s, the second row alternates between 2 and 1, the third row alternates between 1 and 2, and the fourth row alternates between 2 and 1. Thus, the answer is 1, 1, 1, 1.

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18.

Fill in the blanks:

1, 1, 1, 1
1, 2, 1, 2
2, 1, 2, 1
2, 1, 1, 1

Correct Answer

A. 2, 1, 1, 1

Chapter 7 Quiz - Chemistry

What is another name for an ionic compound?

Quiz Preview

What is the term for the number in front of a chemical formula in a chemical equation?

What are the chemicals at the beginning of a reaction called?

What are the chemicals that result from a chemical reaction called?

A chemical reaction is represented by a ________.

Which of the following compounds is a salt?

Electrolytes release _____________ when dissolved in water.

Name the following:

Name the following:

BaSO4 is soluble.

Silver nitrate is soluble.

A precipitate is a(n) ____________ that results when a salt comes out of solution.

Lithium hydroxide is soluble.

Silver hydroxide is soluble.

Calcium carbonate is soluble.

The symbol aq means ______.

Fill in the blanks:

Fill in the blanks: