Question 1

Which of the following best describes a scientific law?

Accepted Answer

A statement that summarizes a pattern found in nature, often expressed mathematically, and is consistently supported by experimental evidence.

Question 2

A sample of metal has a mass of 55.0 grams and a density of $$11.4 \ \mathrm{g/cm^3$}. $$What is the volume of the metal in $$\mathrm{cm^3$}$$?

Accepted Answer

$$4.82 \ \mathrm{cm^3$}$$

Question 3

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Freshly squeezed orange juice with pulp

Question 4

Convert $$9.0$$ miles to meters. ($$1 \ \mathrm{mile} = 1.609 \ \mathrm{km}$$, $$1 \ \mathrm{km} = 1000 \ \mathrm{m})$$

Accepted Answer

$$14,481 \ \mathrm{m}$$

Question 5

Which of the following statements about physical and chemical changes is correct?

Accepted Answer

Boiling water is a physical change because it only changes the state of matter, not the chemical composition.

Question 6

A sample of copper absorbs $$145 \ \mathrm{cal} of $$energy, and its temperature rises from $$37.8^\circ \mathrm{C} to$$ $$41.7^\circ \mathrm{C}. $$What is the mass of the copper in grams? ($$c_{	ext{copper}} = 0.385 \ \mathrm{J/g^\circ C}$$, $$1 \ \mathrm{cal} = 4.184 \ \mathrm{J})$$

Accepted Answer

$$226 \ \mathrm{g}$$

Question 7

Which of the following is a physical property of matter?

Accepted Answer

Density

Question 8

When methane ($$\mathrm{CH_4$}) is $$burned with oxygen, the products are carbon dioxide and water. If you produce $$36 \ \mathrm{g} of $$water and $$44 \ \mathrm{g} of $$carbon dioxide from $$16 \ \mathrm{g} of $$methane, how many grams of oxygen were needed for the reaction?

Accepted Answer

$$64 \ \mathrm{g}$$

Question 9

Which of the following processes is exothermic?

Accepted Answer

Water vapor condensing

Question 10

How many significant figures are in the measurement $$0.00200$$?

Accepted Answer

3

Question 11

Which of the following best describes an element?

Accepted Answer

A pure substance that cannot be broken down into simpler substances by chemical means.

Question 12

A lake has a surface area of $$200$$ square miles. What is the area in $$\mathrm{km^2$}$$? ($$1 \ \mathrm{mile} = 1.609 \ \mathrm{km})$$

Accepted Answer

$$518 \ \mathrm{km^2$}$$

Question 13

Which of the following is the correct order of steps in the scientific method?

Accepted Answer

Make observations, formulate a hypothesis, test the hypothesis, accept or modify the hypothesis, develop into a law and/or theory.

Question 14

Which of the following statements about energy is true?

Accepted Answer

Energy can be converted from one form to another, but cannot be created or destroyed.

Question 15

A $$23.6 \ \mathrm{g}$$ sample of a substance gives off $$199 \ \mathrm{cal} of $$heat when its temperature changes from $$37.9^\circ \mathrm{C} to$$ $$20.9^\circ \mathrm{C}. $$What is the heat capacity in $$\mathrm{cal/g^\circ C}$$?

Accepted Answer

$$0.57 \ \mathrm{cal/g^\circ C}$$

Question 16

Which of the following is a derived SI unit?

Accepted Answer

Joule ($$\mathrm{J})$$

Question 17

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more elements chemically combined in a fixed ratio.

Question 18

Which of the following is the correct scientific notation for $$0.0479$$?

Accepted Answer

$$4.79 	imes 10$$^{-2}$$

Question 19

Which of the following statements about density is correct?

Accepted Answer

Density can be used as a conversion factor to relate mass and volume.

Question 20

Which of the following is an example of a chemical property?

Accepted Answer

Flammability

Introduction to Chemistry: Test 1 Review Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard