ChemistryEOG Review Questions

1. Which is evidence that elements can combine to form new compounds?

A. melting a solidB. freezing a liquidC. moving a piece of metal with a magnetD. pouring two liquids together to create a

solid

2. Which property of metals allows themto be used to make coins that have the

same thickness?

A. electrical conductivityB. densityC. malleabilityD. specific heat

3. Which best describes the physical change of an aluminum soda can after it is crushed?

A. There is a change in the mass of the can.B. There is a change in the weight of the

can.C. There is a change in the volume of the

can.D. There is a change in the specific heat of

the can.

4. Which best describes why metals are used for making pots and pans that are used for cooking?

A. Metals have low specific heats and high melting points.

B. Metals have high specific heats and low melting points.

C. Metals have low specific heats and low melting points.

D. Metals have high specific heats and high melting points.

5. A chemical reaction produces two new substances, and each product has a mass of 25 grams. What was the total mass of the reactants?

A. 25 gramsB. 50 gramsC. 75 gramsD. 100 grams

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 gramsB. 10 gramsC. 15 gramsD. 50 grams

7. Why were some pesticides such as DDT removed from public use?

A. They can cause heart disease.B. They can cause diabetes.C. They can cause meningitis.D. They can cause cancer.

8. The element silicon is best used for which purpose?

A. as a container to keep coffee hotB. as a semiconductor in computer chipsC. as a material to make airplane framesD. as a malleable material for coins and

jewelry

9. Which is an example of a physical change?

A. boilingB. burningC. rottingD. rusting

10. What characteristic of aluminum allows it to be made into aluminum foil?

A. It is dense.B. It is soluble.C. It is magnetic.D. It is malleable.

11. Which pure substance is composed of more than one element?

A. carbonB. goldC. waterD. sodium

12. 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 gas was produced.B. A solid was produced.C. The salinity of the reactants was high.D. The temperature of the reactants was low.

13. Which factor best explains why some people will develop cancer and others will not after being exposed to the same high levels of a harmful chemical?

A. concentration of the chemicalB. potency of the chemicalC. individual susceptibility to the chemicalD. individual exposure to the chemical

14. Which is the best way to determine if an object is made of pure silver?

A. determine the solubility of the objectB. test to see if the object is chemically

reactiveC. determine the density of the object and

compare the known density of pure silverD. compare the mass of the silver object to

the mass of a piece of pure silver

15. Which is a naturally occurring chemical?

A. aspirinB. saltC. plasticD. nylon

16. This table shows the specific heat of four substances. If each substance is exposed to the same amount of

energy for one minute, which substance will get the hottest?

A. LeadB. IronC. GlassD. Ice

Substance Specific Heat (J/kg C)

Lead 128Iron 448

Glass 837

Ice 2,090

17. A beaker with 100 mL of water is placed on a hot plate and heated. The water boils at 100°C. At what temperature would 90 mL of water boil?

A. 10°CB. 90°CC. 100°CD. 110°C

Quick Review!

1. Which of the following is the heaviest?A. The ElectronB. The protonC. The neutronD. The nucleus

Quick Review!

2. Neutral Lithium has 3 protons. During a chemical reaction, 1 electron is removed. How many protons does lithium have now?

A. 3B. 2C. 1D. You must know what element lithium reacted

with to determine this

Quick Review!

3. Which phase has the greatest density?A. The solid phaseB. The liquid phaseC. The gas phaseD. The temperature must be known to answer

this question

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4. How does perspiration cool your skin?A. It carries heat off when it condenses on your

skinB. It carries heat off when it evaporates on your

skinC. It carries heat off when it sublimes on your

skinD. It carries heat off when it deposits on your skin

Quick Review!

5. Laura is studying an unknown substance. She has recorded several properties in his notebook. Which of these properties is a physical property?

A. Boiling pointB. FlammabilityC. Tendency to tarnishD. Tendency to rust

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6. The chemical combination of Atom A and Atom B would result in

A. An atom ABB. An element ABC. A molecule ABD. A nucleus AB

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7. The components of a homogeneous mixture could be described as

A. InseparableB. Evenly mixedC. Chemically boundD. Unevenly mixed

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8. There are 3 mixtures listed below. Which one, if any, could NOT be separated by evaporation?

A. Salt and waterB. Sawdust and waterC. Iron filings and waterD. All of these mixtures can be separated by

evaporation

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9. Carbon combines with oxygen to form carbon dioxide. What is the word equation for this chemical reaction?

A. Carbon dioxide carbon + oxygenB. Carbon carbon dioxide + oxygenC. Carbon + oxygencarbon dioxideD. Carbon dioxide + oxygen carbon

Quick Review!

10. Which of the following may happen during a physical change?

A. New substances are formedB. Reactants form productsC. A precipitate is formedD. The temperature may increase