$$\dfrac{325}{545} \times 100\% = 59.6\%$$

$$\dfrac{220}{300} \times 100\% = 73.3\%$$

$$1 \text{ L} = 1000 \text{ mL}$$

$$0.005 \text{ L} \times 1000 = 5 \text{ mL}$$

Question 1

Which of the following best describes the scientific method as used in chemistry?

Accepted Answer

A general process involving making observations, proposing hypotheses, conducting experiments, and drawing conclusions.

Question 2

A forensic scientist analyzes a blood sample to determine its chemical composition. Which question are they most likely trying to answer?

Accepted Answer

What is the blood sample made of?

Question 3

Which of the following is an example of a chemical as defined in chemistry?

Accepted Answer

A glass of water ($$\mathrm{H_2O})$$

Question 4

A student records that they ran for 25 minutes at the gym. According to the scientific method, this is an example of:

Accepted Answer

An observation

Question 5

Which of the following statements is a hypothesis?

Accepted Answer

You think that your weight loss is due to increased exercise.

Question 6

What is the percentage of aspirin in a tablet that contains 325 mg of aspirin and has a total mass of 545 mg?

Accepted Answer

$$\dfrac{325}{545} 	imes 100\% = 59.6\%$$

Question 7

Which of the following is the correct scientific notation for the number 2,300,000?

Accepted Answer

$$2.3 	imes 10^6$

Question 8

If you multiply two negative numbers, such as $$(-2) 	imes (-3)$$, what is the result?

Accepted Answer

$$+6$$

Question 9

Which of the following is the correct way to subtract $$-12 - (-5)$$?

Accepted Answer

Question 10

Which of the following is the correct way to subtract $$12 - (-5)$$?

Accepted Answer

$$12 - (-5) = 12 + 5 = 17$$

Question 11

A solution contains 220 green balls and 80 red balls. What is the percentage of green balls?

Accepted Answer

$$\dfrac{220}{300} 	imes 100\% = 73.3\%$$

Question 12

Which of the following is the correct conversion from liters to milliliters?

Accepted Answer

$$1 	ext{ L} = 1000 	ext{ mL}$$

Question 13

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$F = C 	imes 1.8 + 32$$

Question 14

A student wants to convert 0.005 L to mL. What is the correct answer?

Accepted Answer

$$0.005 	ext{ L} 	imes 1000 = 5 	ext{ mL}$$

Question 15

Which of the following is NOT a recommended strategy for success in science courses?

Accepted Answer

Wait until the last minute to study.

Question 16

Which of the following is a correct statement about positive and negative numbers in multiplication?

Accepted Answer

Multiplying two negative numbers gives a positive result.

Question 17

Which of the following resources is recommended for chemistry students to supplement their learning?

Accepted Answer

Khan Academy

Question 18

A student needs to solve for $$x in $$the equation $$2x + 8 = 14. $$What is the value of $$x$$?

Accepted Answer

$$x = 3$$

Question 19

Which of the following is the correct way to express 0.00056 in scientific notation?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

CHM 05: Introduction to Chemistry and Study Skills

Guida di studio - Domande di pratica