Question 1

Which of the following best describes a scientific law?

Accepted Answer

A statement that summarizes past observations and predicts new ones.

Question 2

Express the number 0.00050210 in scientific notation using proper LaTeX formatting.

Accepted Answer

$$5.021 	imes 10$$^{-4}$$

Question 3

A student measures the mass of a liquid as 90.5 g and its volume as 96 mL. What is the density of the liquid, reported to the correct number of significant figures?

Accepted Answer

$$0.94\ 	ext{g/mL}$$

Question 4

Which state of matter is compressible and has an indefinite shape?

Accepted Answer

Gas

Question 5

How would you classify salt water?

Accepted Answer

Mixture-homogeneous

Question 6

How many joules are in a 255-calorie snack bar? (Use $$1\ 	ext{cal} = 4.184\ 	ext{J})$$

Accepted Answer

$$1.07 	imes 10$$^{3}$$

Question 7

What is the correct number of significant figures in the number 0.027090?

Accepted Answer

5

Question 8

Which of the following is a theory?

Accepted Answer

Helium balloons float because helium is less dense than air.

Question 9

How many milliliters are in 17.5 L?

Accepted Answer

$$1.75 	imes 10$$^{4}$$

Question 10

Which element has exactly 12 protons?

Accepted Answer

Mg

Question 11

When an atom loses an electron, the resulting particle is called:

Accepted Answer

A cation

Question 12

How many protons and electrons are present in $$	ext{O}^{2-}$$?

Accepted Answer

8 protons and 10 electrons

Question 13

An isotope represented as S-34:

Accepted Answer

None of the above

Question 14

What is the correct decimal representation of $$1.201 	imes 10$$^{-7}$$?

Accepted Answer

$$0.0000001201$$

Question 15

Which prefix corresponds to the multiplier 100?

Accepted Answer

Hecto

Question 16

A student calculates $$3.215 	imes 13.2 \div 0.218. $$What is the answer with the correct number of significant figures?

Accepted Answer

$$194.7$$

Question 17

Which of the following steps is NOT part of the scientific method?

Accepted Answer

All of the above steps are part of the scientific method.

Question 18

How much heat (in kJ) is needed to raise the temperature of 100.0 grams of water from $$25.0^\circ	ext{C} to$$ $$50.0^\circ	ext{C}$$? (Specific heat of water $$= 4.184\ 	ext{J/g}^\circ	ext{C})$$

Accepted Answer

$$10.5$$

Question 19

Which of the following would be considered a pure substance?

Accepted Answer

Element

Question 20

A chemist needs to convert 235 miles to kilometers. Which conversion factor is NOT needed?

Accepted Answer

1 km = 1000 m

Step-by-Step Guidance for Practice Exam Problems (Chem 1114, Chapters 1-4)

Guida di studio - Domande di pratica

Study guide - Flashcard