Question 1

Which of the following best describes a 'chemical' in the context of chemistry?

Accepted Answer

Any substance that is made up of atoms and has a definite composition.

Question 2

Which step of the scientific method involves forming a tentative explanation based on observations?

Accepted Answer

Hypothesis

Question 3

Convert 0.0056 to scientific notation.

Accepted Answer

$$5.6 	imes 10$$^{-3}$$

Question 4

How many significant figures are in the value 120.0?

Accepted Answer

4

Question 5

What is the result of $$1.78 + 0.005$$ rounded to the correct number of significant figures?

Accepted Answer

$$1.78$$

Question 6

Convert 908 grams to pounds. (Given: $$454\ \mathrm{g} = 1\ \mathrm{lb})$$

Accepted Answer

$$2.00\ \mathrm{lb}$$

Question 7

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

micro

Question 8

A sample of alcohol has a density of $$0.9\ \mathrm{g/mL}. $$What is the mass of $$1.2\ \mathrm{L} of $$alcohol?

Accepted Answer

$$1080\ \mathrm{g}$$

Question 9

Which of the following is a chemical change?

Accepted Answer

Match burning

Question 10

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 11

If 4 grams of hydrogen reacts with oxygen to make 36 grams of water, how many grams of oxygen were used? (Law of Conservation of Mass)

Accepted Answer

$$32\ \mathrm{g}$$

Question 12

What is the freezing point of water in Kelvin?

Accepted Answer

$$273.15\ \mathrm{K}$$

Question 13

It takes $$487.5\ \mathrm{J} to $$heat $$25\ \mathrm{g} of $$copper from $$25\ ^\circ\mathrm{C} to$$ $$75\ ^\circ\mathrm{C}. $$What is the specific heat in $$\mathrm{J/g\cdot ^\circ C}$$?

Accepted Answer

$$0.39\ \mathrm{J/g\cdot ^\circ C}$$

Question 14

What was the main conclusion of Rutherford's Gold Foil Experiment?

Accepted Answer

Atoms have a dense, positively charged nucleus.

Question 15

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 16

What is the charge of an ion with 11 protons and 10 electrons?

Accepted Answer

+1

Question 17

Which group on the periodic table contains the halogens?

Accepted Answer

Group 17

Question 18

Calculate the average atomic mass for carbon given the following: Carbon-12 ($$12.00\ \mathrm{amu}$$, $$98.9\%$$), Carbon-13 ($$13.00\ \mathrm{amu}$$, $$1.1\%$$), Carbon-14 ($$14.00\ \mathrm{amu}$$, $$0.1\%).$$

Accepted Answer

$$12.01\ \mathrm{amu}$$

Question 19

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.

Exam 1 Review: Foundations of Chemistry (Chapters 1–4)

Guida di studio - Domande di pratica

Study guide - Flashcard