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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