Question 1

Which of the following best describes the first step of the scientific method?

Accepted Answer

Making an observation about a phenomenon.

Question 2

Which of the following numbers is considered an exact number?

Accepted Answer

4 knives

Question 3

How many significant figures are in the measured value $$6.3 	imes 10$$^{-6}$$?

Accepted Answer

2

Question 4

Calculate $$4.0 	imes 8.00 \div 16$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$2.0$$

Question 5

A doctor prescribes 0.150 mg of Synthroid per day. If tablets in stock contain 75 mcg of Synthroid, how many tablets are required to provide the prescribed medication?

Accepted Answer

2 tablets

Question 6

Low-density lipoprotein (LDL) has a mass of $$0.38\,g$$ and a volume of $$0.362\,mL. $$What is the density in $$g/mL$$?

Accepted Answer

$$1.05\,g/mL$$

Question 7

During surgery, a patient receives $$3.0\,L of $$blood. If the density of blood is $$1.06\,g/mL$$, how many kilograms of blood were transfused?

Accepted Answer

$$3.2\,kg$$

Question 8

Classify nitrox, a combination of oxygen and nitrogen used to fill scuba tanks.

Accepted Answer

A mixture (homogeneous)

Question 9

A defibrillator gives a high-energy shock output of $$360\,J. $$What is this quantity of energy in calories? ($$1\,cal = 4.184\,J)$$

Accepted Answer

$$86\,cal$$

Question 10

During surgery, a patient is cooled from $$38.5^\circ C to$$ $$33.2^\circ C$$ with a blood volume of $$5500\,mL. If $$the specific heat and density of blood are the same as water, how many kilojoules of heat are lost? ($$c = 4.184\,J/g\cdot ^\circ C$$, $$d = 1.00\,g/mL)$$

Accepted Answer

$$120\,kJ$$

Question 11

In thermotherapy, temperatures as high as $$113^\circ F$$ are used. What is this temperature in kelvins?

Accepted Answer

$$318\,K$$

Question 12

Classify the following as a physical or chemical change: Garlic is chopped into small pieces.

Accepted Answer

Physical change

Question 13

If the temperature of an ice cream mixture drops to $$-11^\circ C$$, what is it in degrees Fahrenheit?

Accepted Answer

$$12.2^\circ F$$

Question 14

Which of the following is a metalloid?

Accepted Answer

Si

Question 15

An atom of zinc has a mass number of 68. How many neutrons does it have? (Atomic number of Zn = 30)

Accepted Answer

38

Question 16

How many neutrons are in the nucleus of a bromine atom that has a mass number of 80? (Atomic number of Br = 35)

Accepted Answer

45

Question 17

Which element in each pair has the higher ionization energy? (a) K or Na

Accepted Answer

Na

Question 18

Which of the following best describes a chemical property?

Accepted Answer

Gasoline burns in air.

Question 19

Which of the following is the correct electron arrangement for oxygen?

Accepted Answer

$$2,6$$

Question 20

Which of the following is the correct Lewis symbol for chlorine?

Accepted Answer

Cl with 7 dots around it

GOB Chemistry: Foundational Concepts, Calculations, and Applications

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