Chemistry 9 Practice Test

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1. A solid has a...

Explanation

A solid has a definite shape because its particles are closely packed and have a fixed arrangement, which gives it a specific shape. It also has a definite volume because the particles are tightly packed and cannot be compressed, meaning it occupies a specific amount of space.

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About This Quiz
Chemistry 9 Practice Test - Quiz

This Chemistry 9 Practice Test assesses understanding of matter properties, including states of matter and thermal expansion. Students test their knowledge on how solids, liquids, and gases differ... see moreand explore kinetic energy, enhancing their grasp of basic chemistry principles. see less

2. A gas has...

Explanation

The gas has no definite volume because it expands to fill the entire container it is in. It also has no definite shape because it takes the shape of its container.

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3. The Alkali Metals Group (group 1A) has one valence electron so it makes the elements in this group very reactive.

Explanation

The Alkali Metals Group (group 1A) consists of elements that have one valence electron. This means that they have a strong tendency to lose this electron and form positive ions. This makes them highly reactive as they readily react with other elements to achieve a stable electron configuration. Therefore, the statement that the elements in this group are very reactive is true.

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4. What is the energy of motion?

Explanation

Kinetic energy is the energy of motion. It is the energy possessed by an object due to its motion. When an object is in motion, it has the ability to do work and transfer energy. The amount of kinetic energy an object has depends on its mass and velocity. As an object's mass or velocity increases, its kinetic energy also increases. Therefore, kinetic energy is the correct answer for the given question.

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5. Inversely Proportional: When the temperature goes down, the volume...

Explanation

In an inversely proportional relationship, as one variable increases, the other variable decreases. Therefore, when the temperature goes down, the volume increases.

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6. A liquid has a...

Explanation

The correct answer is "Definite Volume; No Definite Shape". This means that the liquid has a fixed volume, meaning it occupies a specific amount of space, but it does not have a fixed shape and can take the shape of its container. Liquids are able to flow and conform to the shape of their container due to the weak intermolecular forces between their particles.

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7. Proportional: When the temperature goes down, the volume...

Explanation

According to the given statement, when the temperature goes down, the volume goes down. This suggests that there is a proportional relationship between temperature and volume. As temperature decreases, the volume also decreases. This can be explained by the fact that as temperature decreases, the particles in a substance have less energy and move slower, causing them to be closer together and occupy less space, resulting in a decrease in volume.

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8. A covalent bond is when...

Explanation

A covalent bond is formed when two atoms share a pair of valence electrons. In this type of bond, the atoms are able to achieve a stable electron configuration by sharing their outermost electrons. This sharing allows both atoms to fill their outer electron shells and become more stable.

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9. What is a Physical Change?

Explanation

A physical change refers to a transformation in the properties of a material without the formation of new substances. In this type of change, the substance retains its chemical composition, but its physical characteristics, such as shape, size, or state, may alter. This is different from a chemical change where new substances are formed through a chemical reaction.

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10. What classification of matter requires the substance to be an element or a compound?

Explanation

A pure substance is a classification of matter that requires the substance to be either an element or a compound. Elements are substances that cannot be broken down into simpler substances, while compounds are substances made up of two or more elements chemically combined. Both elements and compounds are pure substances because they have a uniform and definite composition. Homogeneous mixtures, solutions, and heterogeneous mixtures do not have a fixed composition and therefore do not fall under the classification of pure substances.

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11. A(n) _____ is a single type of atom that cannot be broken down into simpler substances.

Explanation

An element is a single type of atom that cannot be broken down into simpler substances. Each element has its own unique properties and is represented by a specific symbol on the periodic table. Elements combine to form compounds, but they themselves cannot be further broken down into simpler substances.

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12. Inversely Proportional: When the temperature goes up, the volume...

Explanation

In an inversely proportional relationship, as one variable increases, the other variable decreases. In this case, as the temperature goes up, the volume goes down. This means that when the temperature increases, the volume decreases.

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13. What is a Chemical Change?

Explanation

A chemical change refers to a process in which a reaction takes place and one or more new substances are formed. This means that the original substances undergo a transformation, resulting in the creation of different substances with distinct properties. The formation of new substances is a key characteristic of a chemical change, distinguishing it from a physical change where the properties may alter, but the substance remains the same.

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14. Proportional: When the temperature goes up the volume...

Explanation

When the temperature goes up, the volume of a substance also increases. This is because as the temperature rises, the particles of the substance gain more energy and move faster, causing them to spread out and occupy more space. This relationship is known as direct proportionality, where an increase in one variable (temperature) leads to a corresponding increase in another variable (volume).

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15. Match the following Physical Properties to the correct method for testing each property.
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16. Name the 2 chemical properties of matter.

Explanation

The correct answer is Reactivity, Flammability. Chemical properties of matter refer to the characteristics that describe how a substance interacts with other substances to form new substances. Reactivity is the ability of a substance to undergo a chemical reaction and form new substances. Flammability is the ability of a substance to burn or ignite when exposed to a flame or heat. These two properties are important in understanding the behavior and potential hazards of different substances.

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17. What are the 3 types of evidence for a chemical change?

Explanation

The correct answer is Change in Color, Formation of a Precipitate, and Production of Gas. These three types of evidence are indicators of a chemical change. A change in color occurs when the substance undergoing the change transforms into a different color. Formation of a precipitate happens when two substances react and a solid is formed. Production of gas occurs when a gas is released during a chemical reaction. These evidences suggest that a chemical reaction has taken place and new substances have been formed.

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18. A _____ is a property of a mixture where particles are large enough that they will settle out over time or can be removed through filtration.

Explanation

A solution is a property of a mixture where particles are large enough that they will settle out over time or can be removed through filtration.

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A solid has a...
A gas has...
The Alkali Metals Group (group 1A) has one valence electron so it...
What is the energy of motion?
Inversely Proportional: When the temperature goes down, the volume...
A liquid has a...
Proportional: When the temperature goes down, the volume...
A covalent bond is when...
What is a Physical Change?
What classification of matter requires the substance to be an element...
A(n) _____ is a single type of atom that cannot be broken down into...
Inversely Proportional: When the temperature goes up, the volume...
What is a Chemical Change?
Proportional: When the temperature goes up the volume...
Match the following Physical Properties to the correct method for...
Name the 2 chemical properties of matter.
What are the 3 types of evidence for a chemical change?
A _____ is a property of a mixture where particles are large enough...
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