Q: A chemist wants to convert $$250.0\ \mathrm{mL} to $$liters. Which of the following is the correct calculation?

$$250.0\ \mathrm{mL} \times \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}} = 0.2500\ \mathrm{L}$$

Q: Which of the following is a correct example of dimensional analysis for converting $$5.00\ \mathrm{in} to $$centimeters?

$$5.00\ \mathrm{in} \times \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}} = 12.7\ \mathrm{cm}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

Iron reacts with oxygen to form rust.

Question 2

A sample of water is heated from $$25\ ^\circ\mathrm{C} to$$ $$75\ ^\circ\mathrm{C}. $$Which of the following best describes this process?

Accepted Answer

A physical change, because the temperature changes but the chemical composition remains the same.

Question 3

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

Accepted Answer

Vinegar and oil salad dressing

Question 4

A student measures the mass of a metal sample as $$12.34\ \mathrm{g}$$, $$12.36\ \mathrm{g}$$, and $$12.35\ \mathrm{g} in $$three trials. The true mass is $$12.50\ \mathrm{g}. $$Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 5

Which of the following is an extensive property?

Accepted Answer

Mass

Question 6

A chemist wants to convert $$250.0\ \mathrm{mL} to $$liters. Which of the following is the correct calculation?

Accepted Answer

$$250.0\ \mathrm{mL} 	imes \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}} = 0.2500\ \mathrm{L}$$

Question 7

Which of the following statements about the law of conservation of matter is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 8

A sample of gold has a mass of $$96.5\ \mathrm{g}$$ and a volume of $$5.00\ \mathrm{cm^3$}. $$What is the density of gold?

Accepted Answer

$$19.3\ \mathrm{g/cm^3$}$$

Question 9

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more elements chemically bonded in fixed proportions.

Question 10

Which of the following is the correct relationship between Celsius and Kelvin temperature scales?

Accepted Answer

$$T_K = T_C + 273.15$$

Question 11

A student records the following measurements: $$0.008020. $$How many significant figures are in this value?

Accepted Answer

5

Question 12

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

Accepted Answer

Dissolving sugar in water

Question 13

A scientist wants to convert $$98.6\ ^\circ\mathrm{F} ($$normal human body temperature) to Celsius. Which formula should be used?

Accepted Answer

$$T_C = \frac{5}{9}(T_F - 32)$$

Question 14

Which of the following best describes the symbolic domain in chemistry?

Accepted Answer

It involves the use of chemical symbols and formulas to represent matter.

Question 15

A student adds $$12.11\ \mathrm{g}$$, $$18.0\ \mathrm{g}$$, and $$1.013\ \mathrm{g}. $$What is the sum, rounded to the correct number of decimal places?

Accepted Answer

$$31.1\ \mathrm{g}$$

Question 16

Which of the following is a correct example of dimensional analysis for converting $$5.00\ \mathrm{in} to $$centimeters?

Accepted Answer

$$5.00\ \mathrm{in} 	imes \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}} = 12.7\ \mathrm{cm}$$

Question 17

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 18

Which of the following best describes plasma?

Accepted Answer

A gaseous state of matter containing a significant amount of electrically charged particles.

Question 19

Which of the following is a correct statement about elements and compounds?

Accepted Answer

Compounds can be broken down into elements by chemical changes.

Question 20

A student multiplies $$2.5 (2 $$significant figures) by $$3.42 (3 $$significant figures). What is the correct answer, with the proper number of significant figures?

Accepted Answer

$$8.6$$

Essential Ideas in Chemistry: Chapter 1 Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard