Q: Which of the following is the correct formula for converting Celsius to Fahrenheit?

$^\circ\!F = (^\circ\!C \times 1.8) + 32$

Question 1

Which of the following is an example of a homogeneous mixture?

Accepted Answer

A glass of salt water

Question 2

Which statement best describes a compound?

Accepted Answer

A substance made of two or more elements chemically joined together

Question 3

Which of the following is the correct chemical formula for a compound containing two hydrogen atoms and one oxygen atom?

Accepted Answer

$\mathrm{H_2O}$

Question 4

A student measures the mass of a sample as 12.30 g and its volume as 4.10 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$3.00\ \mathrm{g/mL}$

Question 5

Which of the following best describes a physical change?

Accepted Answer

Ice melting to form liquid water

Question 6

Which of the following is a correct conversion factor for converting 1.5 L to mL?

Accepted Answer

$\frac{1000\ \mathrm{mL}}{1\ \mathrm{L}}$

Question 7

A patient’s body temperature is measured as 39.0 $^\circ$C. What is this temperature in Kelvin?

Accepted Answer

$312.0\ \mathrm{K}$

Question 8

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between nonzero digits are always significant.

Question 9

Which of the following is the correct balanced chemical equation for the reaction of hydrogen gas with oxygen gas to form water?

Accepted Answer

$2\mathrm{H_2}(g) + \mathrm{O_2}(g) \rightarrow 2\mathrm{H_2O}(l)$

Question 10

A sample of urine has a density of $1.03\ \mathrm{g/mL}$. What is its specific gravity?

Accepted Answer

$1.03$

Question 11

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close a measurement is to the true value; precision is how close repeated measurements are to each other.

Question 12

Convert $0.00450$ to scientific notation with the correct number of significant figures.

Accepted Answer

$4.50 	imes 10^{-3}$

Question 13

Which of the following is a micronutrient essential for human health?

Accepted Answer

Iron

Question 14

A medication is prescribed at a dose of $0.25\ \mathrm{mg/kg}$ for a child weighing $32\ \mathrm{kg}$. How many milligrams should be administered?

Accepted Answer

$8.0\ \mathrm{mg}$

Question 15

Which of the following is the correct relationship between Calories and calories?

Accepted Answer

$1\ \mathrm{Calorie} = 1000\ \mathrm{calories}$

Question 16

Which of the following best describes the arrangement and movement of particles in a gas?

Accepted Answer

Particles are far apart, move rapidly, and fill the entire container.

Question 17

A solution is prepared by dissolving $5.0\ \mathrm{g}$ of NaCl in enough water to make $250\ \mathrm{mL}$ of solution. What is the percent (m/v) concentration of NaCl in the solution?

Accepted Answer

$2.0\%$

Question 18

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

Accepted Answer

$^\circ\!F = (^\circ\!C 	imes 1.8) + 32$

Question 19

A metal sample absorbs $150.0\ \mathrm{J}$ of heat, causing its temperature to increase by $15.0\ ^\circ\!C$. If the mass of the sample is $10.0\ \mathrm{g}$, what is the specific heat of the metal?

Accepted Answer

$1.00\ \mathrm{J/g\ ^\circ\!C}$

Chapter 1: Chemistry Basics—Matter and Measurement (GOB Chemistry Study Notes)

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