Q: A forensic scientist analyzes a bullet and finds it contains 13.9 g of lead, 0.3 g of tin, and 0.9 g of antimony. What is the percentage of tin in the bullet? (Express your answer to the ones place.)

$$\frac{0.3}{15.1} \times 100\% = 2\%$$

Q: Which of the following numbers is correctly written in scientific notation?

$$0.00086 = 8.6 \times 10$$^{-4}$$

Q: Which of the following is the correct way to calculate the percentage of aspirin in a tablet containing 325 mg aspirin and 545 mg total mass?

$$\frac{325}{545} \times 100\%$$

Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of composition, structure, properties, and reactions of matter.

Question 2

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 3

Toothpaste contains several chemicals. Which chemical is responsible for making toothpaste white and opaque?

Accepted Answer

Titanium dioxide

Question 4

A forensic scientist analyzes a bullet and finds it contains 13.9 g of lead, 0.3 g of tin, and 0.9 g of antimony. What is the percentage of tin in the bullet? (Express your answer to the ones place.)

Accepted Answer

$$\frac{0.3}{15.1} 	imes 100\% = 2\%$$

Question 5

Which step of the scientific method is illustrated by the statement: 'The blender does not work when plugged into a different outlet'?

Accepted Answer

Experiment

Question 6

Which of the following activities is NOT part of a successful study plan for chemistry?

Accepted Answer

Staying out late the night before an exam

Question 7

What is the place value of the digit 2 in the number 15.24?

Accepted Answer

Tenths

Question 8

Which of the following equations correctly solves for $$V_2 in $$the equation $$P_1V_1 = P_2V_2$$?

Accepted Answer

$$V_2$$ = \frac{P_1V_1}{$$P_2$$}$$

Question 9

A nurse records a patient's pulse as 30 beats/min. According to the scientific method, this is an example of:

Accepted Answer

An observation

Question 10

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$0.00086 = 8.6 	imes 10$$^{-4}$$

Question 11

Which of the following best describes a chemical?

Accepted Answer

A substance with the same composition and properties wherever found.

Question 12

If you add $$-3$$ and $$+7$$, what is the result?

Accepted Answer

$$+4$$

Question 13

Which of the following is a direct relationship as shown on a graph?

Accepted Answer

As one variable increases, the other increases.

Question 14

A student multiplies $$-2 by$$ $$-3. $$What is the result?

Accepted Answer

$$+6$$

Question 15

Which of the following is the correct scientific notation for 72,000,000?

Accepted Answer

$$7.2 	imes 10$$^{7}$$

Question 16

Which of the following is an effective strategy for learning chemistry?

Accepted Answer

Self-testing with practice problems

Question 17

A bullet has a mass of 15.24 g. What is the place value of the digit 4?

Accepted Answer

Hundredths

Question 18

Which of the following is the correct way to calculate the percentage of aspirin in a tablet containing 325 mg aspirin and 545 mg total mass?

Accepted Answer

$$\frac{325}{545} 	imes 100\%$$

Question 19

Which of the following is an example of a hypothesis?

Accepted Answer

A doctor thinks a patient's symptoms are due to an infection.

Question 20

Which of the following is the correct scientific notation for 0.000 008?

Accepted Answer

$$8 	imes 10$$^{-6}$$

Chapter 1: Chemistry in Our Lives – Foundations for GOB Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard