$$\frac{2.0\ \text{L} \times 1000\ \text{mL/L} \times 20\ \text{gtt/mL}}{18\ \text{h} \times 60\ \text{min/h}} = 37$$ gtt/min

$$\frac{1.32\ \text{kg} \times 1000\ \text{g/kg}}{2.0\ \text{L} \times 1000\ \text{mL/L}} = 0.66 g/mL$$

$$225 \times 4184 = 942,900 J$$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout, such as salt dissolved in water.

Question 2

Which of the following is a chemical change?

Accepted Answer

Burning charcoal in a grill to produce carbon dioxide and ash.

Question 3

How many significant figures are in the measurement 0.00320 g?

Accepted Answer

3

Question 4

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass.

Question 5

A patient receives 2.0 L of IV fluid over 18 hours. If the drop factor is 20 gtt/mL, what is the drip rate in drops per minute (gtt/min)?

Accepted Answer

$$\frac{2.0\ 	ext{L} 	imes 1000\ 	ext{mL/L} 	imes 20\ 	ext{gtt/mL}}{18\ 	ext{h} 	imes 60\ 	ext{min/h}} = 37$$ gtt/min

Question 6

Which of the following is the correct balanced equation for the combustion of ethane ($$C_2H_6) in $$oxygen?

Accepted Answer

$$2\ C_2H_6(g) + 7\ O_2$(g) \rightarrow 4\ CO_2$(g) + 6\ H_2O(g)$$

Question 7

Convert 0.00045 to scientific notation with the correct number of significant figures.

Accepted Answer

$$4.5 	imes 10$$^{-4}$$

Question 8

A sample of gasoline has a mass of 1.32 kg and a volume of 2.0 L. What is its density in g/mL?

Accepted Answer

$$\frac{1.32\ 	ext{kg} 	imes 1000\ 	ext{g/kg}}{2.0\ 	ext{L} 	imes 1000\ 	ext{mL/L}} = 0.66 g/mL$$

Question 9

Which of the following statements about the periodic table is correct?

Accepted Answer

Groups are vertical columns and indicate elements with similar chemical properties.

Question 10

Which of the following is an example of a compound?

Accepted Answer

Table salt ($$NaCl)$$

Question 11

A moderate walk burns 225 Calories per hour. How many joules are burned in one hour? (1 Calorie = 4184 J)

Accepted Answer

$$225 	imes 4184 = 942,900 J$$

Question 12

Which of the following best describes specific gravity?

Accepted Answer

The ratio of the density of a sample to the density of water, and it is unitless.

Question 13

Convert 37 °C to Kelvin.

Accepted Answer

$$37 + 273 = 310 K$$

Question 14

Which of the following best describes the difference between kinetic and potential energy?

Accepted Answer

Kinetic energy is the energy of motion, while potential energy is stored energy.

Question 15

Which of the following is the correct formula for calculating density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 16

A beaker contains 67.81 g of a blue liquid. How many significant figures are in this measurement?

Accepted Answer

4

Question 17

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition varies throughout, such as rocky road ice cream.

Question 18

Which of the following is an example of good precision but poor accuracy?

Accepted Answer

Tossing three horseshoes and all three land 3 feet in front of the center pole on top of each other.

Question 19

Which of the following is the correct conversion from 0.5 years to hours?

Accepted Answer

$$0.5 	imes 365 	imes 24 = 4380$$ hours

Chapter 1: Chemistry Basics – Matter and Measurement (GOB Chemistry Study Guide)

Guida di studio - Domande di pratica