Q: Which of the following is the correct formula for density?

$density = \\frac{mass}{volume}$

Question 1

Which of the following statements best describes a pure substance?

Accepted Answer

A pure substance contains only one type of chemical, either an element or a compound.

Question 2

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

Accepted Answer

Melting point.

Question 3

A student wants to separate a mixture of sand and salt dissolved in water. Which sequence of separation techniques should they use?

Accepted Answer

Filtration followed by evaporation.

Question 4

Which of the following best describes the difference between a crystalline and an amorphous solid?

Accepted Answer

Crystalline solids have atoms or molecules arranged in a long-range, repeating order, while amorphous solids lack this order.

Question 5

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 6

A sample of water is heated from 20 $^\circ$C to 80 $^\circ$C. Which type of energy is primarily increased?

Accepted Answer

Kinetic energy

Question 7

Which of the following statements about the Law of Conservation of Mass is correct?

Accepted Answer

Mass is conserved in a chemical reaction; it is neither created nor destroyed.

Question 8

Which SI base unit is correctly matched with its quantity?

Accepted Answer

Mole (mol) for amount of substance

Question 9

A student measures the mass of a sample as 0.00560 g. How many significant figures are in this measurement?

Accepted Answer

3

Question 10

Which of the following is NOT a correct statement about scientific theories and laws?

Accepted Answer

A scientific law explains why phenomena occur.

Question 11

Which of the following is the correct formula for density?

Accepted Answer

$density = \frac{mass}{volume}$

Question 12

A mixture of ethanol and water is separated by distillation. What property allows this separation?

Accepted Answer

Boiling point

Question 13

Which of the following is a homogeneous mixture?

Accepted Answer

Black coffee

Question 14

Convert 98.6 $^\circ$F to Celsius using the formula $T_C = \frac{5}{9}(T_F - 32)$. What is the result?

Accepted Answer

37 $^\circ$C

Question 15

Which of the following is an example of a chemical property?

Accepted Answer

Ability to react with oxygen

Question 16

A student records the following measurements for the mass of a sample: 2.51 g, 2.50 g, 2.52 g, and 2.51 g. The true mass is 2.80 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 17

Which prefix represents $10^{-6}$ in the SI system?

Accepted Answer

micro-

Question 18

Which of the following is an example of a systematic error?

Accepted Answer

A balance that is not calibrated correctly, causing all measurements to be off by 0.5 g.

Question 19

Which of the following statements about energy is correct?

Accepted Answer

Energy is always conserved in physical and chemical changes.

Question 20

A student needs to convert 5.00 inches to centimeters. Using the conversion $1 \text{ in} = 2.54 \text{ cm}$, what is the result?

Accepted Answer

12.7 cm

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