Question 1

Which of the following is a chemical change?

Accepted Answer

Rusting of an iron nail

Question 2

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio

Question 3

Which of the following is the correct symbol for the element with atomic number 17?

Accepted Answer

Cl

Question 4

A patient receives 500 mg of a medication. What is this mass in grams? (Use the metric prefix: 1 mg = $$1 	imes 10$$^{-3}$$ g)

Accepted Answer

$$0.5 g$$

Question 5

Which of the following is the correct order of metric prefixes from largest to smallest?

Accepted Answer

kilo-, centi-, milli-, micro-

Question 6

How many significant figures are in the measurement $$0.00450 mL$$?

Accepted Answer

3

Question 7

Express $$0.000321 in $$scientific notation with the correct number of significant figures.

Accepted Answer

$$3.21 	imes 10$$^{-4}$$

Question 8

A student measures the mass of a sample as $$12.3 g $$and its volume as $$4.56 mL. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$2.70 g/mL$$

Question 9

A piece of metal with a mass of $$15.0 g is $$heated from $$25.0\ ^\circ\mathrm{C} to$$ $$55.0\ ^\circ\mathrm{C}$$, absorbing $$210 J of $$heat. What is the specific heat of the metal? (Use $$q = m c \Delta T)$$

Accepted Answer

$$0.467 J/g$$\cdot ^\circ\mathrm{C}$

Question 10

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 11

Given the atomic number $$Z = 12$$ and mass number $$A = 25$$ for a magnesium atom, how many neutrons are in its nucleus?

Accepted Answer

$$13$$

Question 12

A sample of chlorine contains $$75.77\%$$ $$^{35}\mathrm{Cl} ($$mass $$= 34.97 u) $$and $$24.23\%$$ $$^{37}\mathrm{Cl} ($$mass $$= 36.97 u). $$What is the average atomic mass of chlorine?

Accepted Answer

$$35.45 u$$

Question 13

Which of the following elements is a noble (inert) gas?

Accepted Answer

Neon

Question 14

Which of the following best describes a transition metal?

Accepted Answer

An element found in groups 3-12 of the periodic table

Question 15

Which of the following is a metalloid?

Accepted Answer

Silicon

Question 16

A nurse needs to administer $$0.250 L of $$saline solution. How many milliliters is this?

Accepted Answer

$$250 mL$$

Question 17

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 18

Which group on the periodic table contains the alkali metals?

Accepted Answer

Group 1

Question 19

A solution is prepared by mixing $$10.0 g of $$NaCl with $$90.0 g of $$water. Which statement best describes the resulting mixture?

Accepted Answer

It is a homogeneous mixture

Question 20

Which of the following best describes a period on the periodic table?

Accepted Answer

A horizontal row of elements

Fundamental Concepts in Chemistry: Properties, Measurement, and Atomic Structure

Guida di studio - Domande di pratica

Study guide - Flashcard