Question 1

Which of the following contains the most atoms? You shouldn't need to do a calculation here.

Accepted Answer

A)   10.0 g Al
B)   10.0 g He
C)   10.0 g Ca
D)   10.0 g Kr
E)   10.0 g Cs

Question 2

How many argon atoms are contained in 7.66 × 105 mmol of argon?

Accepted Answer

A)   4.61 × 1026 Ar atoms
B)   1.84 × 1028 Ar atoms
C)   1.15 × 1028 Ar atoms
D)   7.86 × 1020 Ar atoms
E)   3.24 × 1026 Ar atoms

Question 3

A new compound was recently discovered and found to have an atomic weight of 342.38 amu.This element has two isotopes,the lighter of which has a mass of 340.91 amu and an abundance of 68.322%.What is the mass of the heavier isotope?

Accepted Answer

A)   350.21
B)   345.55
C)   342.38
D)   348.67
E)   343.29

Question 4

What mass (in mg) does 0.04518 moles of silver have?

Accepted Answer

A)   8402 mg
B)   154.2 mg
C)   2284 mg
D)   4874 mg
E)   843.0 mg

Question 5

Which of the following represents a valid hypothesis?

Accepted Answer

A)   Neon does not react with oxygen.
B)   Sodium metal reacts violently with water.
C)   Lead is soft and malleable.
D)   Oxygen is a gas at room temperature.
E)   Metals tend to lose electrons.

Question 6

Define matter.

Accepted Answer

Matter is anything t...

Question 7

All of the following will lead to a homogeneous mixture EXCEPT

Accepted Answer

A)   sugar and coffee.
B)   mud and water.
C)   salt and water.
D)   ice tea and lemonade.
E)   vinegar and water.

Question 8

Give the symbol for silver.

Accepted Answer

A)   S
B)   Si
C)   Ar
D)   Ag
E)   Sl

Question 9

Identify the instrument that is used to determine the mass of a molecule.

Accepted Answer

A)   mass spectrometer
B)   nuclear magnetic resonance spectrometer
C)   infrared spectrometer
D)   gas chromatograph
E)   ultraviolet spectrophotometer

Question 10

An atom of 26Mg contains ________ neutrons.

Accepted Answer

A)   12
B)   38
C)   14
D)   24
E)   26

Question 11

How many neutrons are in magnesium?

Accepted Answer

A)   12
B)   13
C)   14
D)   12.3
E)   24.3

Question 12

A substance composed of two or more elements in a fixed,definite proportion is

Accepted Answer

A)   a homogeneous mixture.
B)   a heterogeneous mixture.
C)   a compound.
D)   a solution.
E)   an alloy.

Question 13

Which of the following statements is FALSE according to Dalton's Atomic Theory?

Accepted Answer

A)   Atoms combine in simple whole number ratios to form compounds.
B)   All atoms of chlorine have identical properties that distinguish them from other elements.
C)   One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide.
D)   Atoms of sodium do not change into another element during chemical reaction with chlorine.
E)   An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen.

Question 14

Water is an example of

Accepted Answer

A)   a compound.
B)   an element.
C)   a heterogeneous mixture.
D)   a homogeneous mixture.

Question 15

What species is represented by the following information?
P+ = 47 n° = 62 e- = 46

Accepted Answer

A)   Ag+
B)   Nd
C)   Pd
D)   Ag
E)   Pd+

Question 16

What element is defined by the following information?
P+ = 17 n° = 20 e- = 17

Accepted Answer

A)   calcium
B)   rubidium
C)   chlorine
D)   neon
E)   oxygen

Question 17

How many Zn atoms are contained in 922 g of Zn?

Accepted Answer

A)   5.90 × 1025 Zn atoms
B)   7.09 × 1021 Zn atoms
C)   8.49 × 1024 Zn atoms
D)   4.27 × 1022 Zn atoms
E)   4.18 × 1024 Zn atoms

Question 18

Choose the heterogeneous mixture from the list below.

Accepted Answer

A)   sports drink
B)   chlorine gas
C)   black coffee
D)   lasagna
E)   carbon (graphite)

Question 19

Which of the following is an example of the law of multiple proportions?

Accepted Answer

A)   A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.
B)   Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C.
C)   Two different samples of table salt are found to have the same ratio of sodium to chlorine.
D)   The atomic mass of bromine is found to be 79.90 amu.
E)   Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N.

Question 20

The atomic number is equal to the number of ________.

Accepted Answer

The answer of The atomic number is equal to the...

Exam 2: Atoms

All of the following will lead to a homogeneous mixture EXCEPT

Correct AnswerverifiedShow Answer

Give the symbol for silver.

Correct AnswerverifiedShow Answer

Which of the following contains the most atoms? You shouldn't need to do a calculation here.

Correct AnswerverifiedShow Answer

Identify the instrument that is used to determine the mass of a molecule.

Correct AnswerverifiedShow Answer

Which of the following statements is FALSE according to Dalton's Atomic Theory?

Correct AnswerverifiedShow Answer

A substance composed of two or more elements in a fixed,definite proportion is

Correct AnswerverifiedShow Answer

What element is defined by the following information? P+ = 17 n° = 20 e- = 17

Correct AnswerverifiedShow Answer

How many neutrons are in magnesium?

Correct AnswerverifiedShow Answer

Water is an example of

Correct AnswerverifiedShow Answer

Define matter.

Correct AnswerverifiedMatter is anything t...View AnswerShow Answer

A new compound was recently discovered and found to have an atomic weight of 342.38 amu.This element has two isotopes,the lighter of which has a mass of 340.91 amu and an abundance of 68.322%.What is the mass of the heavier isotope?

Correct AnswerverifiedShow Answer

How many Zn atoms are contained in 922 g of Zn?

Correct AnswerverifiedShow Answer

Which of the following represents a valid hypothesis?

Correct AnswerverifiedShow Answer

How many argon atoms are contained in 7.66 × 105 mmol of argon?

Correct AnswerverifiedShow Answer

What mass (in mg) does 0.04518 moles of silver have?

Correct AnswerverifiedShow Answer

The atomic number is equal to the number of ________.

Correct AnswerverifiedShow Answer

Which of the following is an example of the law of multiple proportions?

Correct AnswerverifiedShow Answer

An atom of 26Mg contains ________ neutrons.

Correct AnswerverifiedShow Answer

What species is represented by the following information? P+ = 47 n° = 62 e- = 46

Correct AnswerverifiedShow Answer

Choose the heterogeneous mixture from the list below.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What element is defined by the following information? P⁺ = 17 n° = 20 e^- = 17

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Matter is anything t...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How many argon atoms are contained in 7.66 × 10⁵ mmol of argon?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

An atom of 26_{Mg contains ________ neutrons.}

Correct Answer
verified

What species is represented by the following information? P⁺ = 47 n° = 62 e^- = 46

Correct Answer
verified

Correct Answer
verified