Q: A student needs to convert 250 cm to meters using dimensional analysis. Which of the following is the correct setup?

$$250 \ \mathrm{cm} \times \frac{1 \ \mathrm{m}}{100 \ \mathrm{cm}}$$

Question 1

Which of the following statements best describes the difference between a physical and a chemical property?

Accepted Answer

A chemical property describes the ability of a substance to undergo a specific chemical change, while a physical property can be observed without changing the substance's identity.

Question 2

A student measures the mass of a sample as 12.305 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 3

Which of the following is the correct scientific notation for the number 0.000456?

Accepted Answer

$$4.56 	imes 10$$^{-4}$$

Question 4

Which of the following is an example of an endothermic process?

Accepted Answer

Melting of ice to form liquid water

Question 5

A sample of metal has a mass of 45.0 g and a volume of 15.0 mL. What is its density?

Accepted Answer

$$3.0 \ \mathrm{g/mL}$$

Question 6

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

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 7

Which of the following elements is a non-metal?

Accepted Answer

Oxygen ($$O)$$

Question 8

What is the charge on the iron ion in the compound $$Fe_2O_3$$?

Accepted Answer

$$+3$$

Question 9

Which of the following is the correct chemical symbol for potassium?

Accepted Answer

K

Question 10

A student needs to convert 250 cm to meters using dimensional analysis. Which of the following is the correct setup?

Accepted Answer

$$250 \ \mathrm{cm} 	imes \frac{1 \ \mathrm{m}}{100 \ \mathrm{cm}}$$

Question 11

Which of the following is a diatomic element in its natural state?

Accepted Answer

Nitrogen ($$N_2)$$

Question 12

Which of the following is the correct formula for a binary ionic compound formed from magnesium and chlorine?

Accepted Answer

$$MgCl_2$$

Question 13

A student is asked to determine the number of significant figures in the result of $$2.50 	imes 0.040. $$What is the correct answer?

Accepted Answer

2

Question 14

Which of the following best describes the scientific method?

Accepted Answer

A systematic approach to research involving observation, hypothesis, experimentation, and conclusion

Question 15

Which of the following is the correct symbol and meaning for the SI unit of mass?

Accepted Answer

kg, kilogram

Question 16

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

Accepted Answer

Elements in the same group have similar chemical properties.

Question 17

A chemical reaction releases heat to its surroundings. What type of reaction is this?

Accepted Answer

Exothermic

Question 18

Which of the following is the correct ionic charge for a chloride ion?

Accepted Answer

$$-1$$

Question 19

A patient receives 500 mg of a medication. How many grams is this?

Accepted Answer

$$0.5 \ \mathrm{g}$$

Question 20

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas

Exam 1 Study Guide: Introduction to Chemistry – Key Concepts and Expectations

Guida di studio - Domande di pratica

Study guide - Flashcard