Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of a substance to react with oxygen to form a new substance.

Question 2

A sample of matter has a definite shape and a definite volume. Which state of matter is this sample in?

Accepted Answer

Solid

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 4

How many oxygen atoms are present in one formula unit of $$\mathrm{Fe_2$(SO_4$)_3}$$?

Accepted Answer

$$12$$

Question 5

Which of the following is the correct scientific notation for $$0.000073$$?

Accepted Answer

$$7.3 	imes 10$$^{-5}$$

Question 6

A patient weighs $$85\ \mathrm{kg}. $$What is the patient’s weight in grams?

Accepted Answer

$$85,000\ \mathrm{g}$$

Question 7

Convert $$37.0\ ^\circ\mathrm{C} to $$Fahrenheit using the formula $$T^\circ\mathrm{F} = 1.8\,T^\circ\mathrm{C} + 32.$$

Accepted Answer

$$98.6\ ^\circ\mathrm{F}$$

Question 8

What is the density (in $$\mathrm{g/cm^3$}) of a $$lithium cube with sides $$0.82\ \mathrm{cm}$$, $$1.45\ \mathrm{cm}$$, and $$1.25\ \mathrm{cm}$$, and a mass of $$0.794\ \mathrm{g}$$?

Accepted Answer

$$0.44\ \mathrm{g/cm^3$}$$

Question 9

A dialysis unit requires $$75,000\ \mathrm{mL} of $$distilled water. How many gallons are needed? ($$1\ \mathrm{gal} = 4\ \mathrm{qt}$$, $$1\ \mathrm{L} = 1.057\ \mathrm{qt}$$, $$1\ \mathrm{L} = 1000\ \mathrm{mL})$$

Accepted Answer

$$19.8\ \mathrm{gal}$$

Question 10

Calculate the energy in joules required to heat $$26.0\ \mathrm{g} of $$water from $$5.5\ ^\circ\mathrm{C} to$$ $$64.8\ ^\circ\mathrm{C}$$ ($$\mathrm{SH_{H_2O}} = 4.18\ \mathrm{J/g\ ^\circ C}). $$Use $$\mathrm{Heat} = \mathrm{SH} 	imes \mathrm{mass} 	imes \Delta T.$$

Accepted Answer

$$6,429\ \mathrm{J}$$

Question 11

Which of the following is an example of a physical change?

Accepted Answer

Dissolving sugar in water

Question 12

Which of the following is an exact number?

Accepted Answer

The number of centimeters in an inch

Question 13

A solution is prepared by dissolving $$5.00\ \mathrm{g} of $$salt in $$100.0\ \mathrm{g} of $$water. Which term best describes this mixture?

Accepted Answer

Homogeneous mixture

Question 14

Which of the following is the correct conversion factor for $$1\ \mathrm{kg} = 2.205\ \mathrm{lb}$$?

Accepted Answer

$$\frac{2.205\ \mathrm{lb}}{1\ \mathrm{kg}}$$

Question 15

A graduated cylinder contains $$25.0\ \mathrm{mL} of $$water. After a metal object is added, the volume rises to $$32.5\ \mathrm{mL}. If $$the mass of the object is $$60.0\ \mathrm{g}$$, what is its density?

Accepted Answer

$$2.67\ \mathrm{g/mL}$$

Question 16

Which of the following statements about significant figures is correct?

Accepted Answer

All nonzero digits are significant.

Question 17

A doctor orders $$4$$ tablets of amoxicillin per day for $$10$$ days. Each tablet contains $$250\ \mathrm{mg} of $$amoxicillin. How many ounces of medication are given in $$10$$ days? ($$1\ \mathrm{g} = 0.03527\ \mathrm{oz})$$

Accepted Answer

$$0.353\ \mathrm{oz}$$

Question 18

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$T_K = T^\circ C + 273.15$$

Chapter 1: Matter and Measurements – GOB Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard