Which of the following describes elements ? (choose all correct answers)

all elements are found in the periodic table

at least two types of atoms must join together

Which list below correctly identifies the elements and compounds from above?

The elements are: H and Pb The compounds are: H2O and CN

The element is: H The compounds are: H2O, Pb and CN

The elements are: H and H2O The compounds are: Pb and CN

In Activity 27 you combined a metal washer with copper chloride etching solution. A brown substance formed around some of the washers as the liquid bubbled and fizzed. Identify the products of this reaction. (select all correct answers)

the copper chloride etching solution

Which properties would be most helpful when identifying Material A?

Flame resistance and ability to dye material

Insulates against cold and flame resistance

Ability to dye material and resists shrinking in water

When choosing a material to make a product, such as a soft drink container, the most important factor is...

the environmental impact of the manufacturing process

how easy it is to recycle after the container is used

The life cycle of a product refers to...

the stages from when the product is made until it is disposed of

the amount of time the product is expected to last

the guarantee that the manufacturer provides

how the product is used in its life

Plastics are made from

silicon sand, soda ash, and limestone

Which of the following is a list of physical properties?

electrical conductivity, hardness, ability to transmit light

density, conductivity, reaction with acid

flexibility, reaction with hydrochloric acid, color

temperature change when a chemical is added, texture, density

A student pours two different solutions into a glass beaker. Which of the following would indicate that a chemical reaction took place between two solutions?

A change in color of a solution

While working on an activity to investigate chemical reactions, a student mixes two clear liquids in a beaker. When the two liquids mix, the result is a clear liquid and an orange solid precipitate. Which best describes the reactants that the student worked with?

The resulting clear liquid and the beaker

Which of the following statements about dilution as an approach to handling toxic waste is TRUE?

Dilution lowers the concentration of toxic materials in liquid wastes.

Dilution removes the toxic materials in liquid wastes.

Diluting a liquid until it is clear and colorless means that the liquid is safe for disposal in local sewers.

Why is ammonia used to test for copper in a solution? Choose the best answer.

The ammonia test can detect smaller amounts of copper than the human eye can detect.

Different people see colors differently.

The odor of ammonia is easily detected by most people.

All chemical tests are superior to relying on information provided by the senses.

A consumer wants to do his or her part to reduce the production of waste. Which one of the following is he or she likely to do?

Buy products that cannot be recycled.

Buy from companies that use only new raw materials

Which property (ies) would be the most useful in identifying Polyamide? Explain.

Resistance to strong acids or bases

Resistance to softening at high temperatures

Resistance to solvents such as acetone

The Law of Conservation of Mass States

Mass cannot be created nor destroyed, it can only change form.

Energy cannot be created nor destroyed, it can only change form.

Matter cannot be created nor destroyed, it can only change form.

Mass can be created or destroyed, it cannot change form.

What is a closed system?

a system where none of the reactants or products are allowed to escape

compounds made of thousands of repeating smaller molecules

the output, or result of a chemical reaction

occurs when the atoms and molecules of two or more substances rearrange to form new substances

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

You can't tell with the given information.

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

You can't tell with the given information.

Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.

The gas that was produced was not able to be weighed since the container was open.

His chemical reaction defied the law of conservation of mass

The product destroyed mass during the reaction

The reactants created matter during the reaction

How is a physical change different from a chemical change?

Chemical changes produce a new substance, physical changes stay the same substance

There is absolutely no difference

Chemical changes create and destroy matter, physical changes don't

Physical changes create and destroy matter, chemical changes dont

Unit B Test review

Authored by Amy Singletary

Science

8th Grade

NGSS covered

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80 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of property describes how a substance reacts when mixed with another substance?

physical property

chemical property

Tags

NGSS.MS-PS1-2

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Which of the following are physical properties? (select all correct answers)

reaction to acid

number of bonds with hydrogen

electrical conductivity

density

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Which of the following are chemical properties?(select all correct answers)

reaction with acid

electrical conductivity

hardness

temperature change when two liquids are mixed

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which property is least helpful when identifying a material?

texture

luster

shape

color

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Which of the following are signs of a chemical reaction? (choose all correct answers)

color change

a precipitate (solid) forms in a liquid

dissolving

freezing

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to a molecule’s atoms during a chemical reaction?

The atoms are destroyed

New atoms form

The atoms are rearranged and join to different atoms

The atoms bubble and fizz

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a chemical reaction do to the substances’ properties?

the properties change and the new substance that forms has new properties

nothing happens to the properties

nobody knows what happens

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Unit B Test review

What type of property describes how a substance reacts when mixed with another substance?

Which of the following are physical properties? (select all correct answers)

Which of the following are chemical properties?(select all correct answers)

Which property is least helpful when identifying a material?

Which of the following are signs of a chemical reaction? (choose all correct answers)

What happens to a molecule’s atoms during a chemical reaction?

What does a chemical reaction do to the substances’ properties?

Which column of the Periodic Table contains the Noble gases?

How many ELEMENTS are in one molecule of sulfuric acid?
(see chemical formula above)

Which of the following describes elements ? (choose all correct answers)

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Unit B Test review

What type of property describes how a substance reacts when mixed with another substance?

Which of the following are physical properties? (select all correct answers)

Which of the following are chemical properties?(select all correct answers)

Which property is least helpful when identifying a material?

Which of the following are signs of a chemical reaction? (choose all correct answers)

What happens to a molecule’s atoms during a chemical reaction?

What does a chemical reaction do to the substances’ properties?

Which column of the Periodic Table contains the Noble gases?

How many ELEMENTS are in one molecule of sulfuric acid? (see chemical formula above)

Which of the following describes elements ? (choose all correct answers)

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

How many ELEMENTS are in one molecule of sulfuric acid?
(see chemical formula above)