HChem1
3 days ago
mbiddle_63627
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• Question 1
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Q.

Which statement describes the earliest model of the atom?

An atom is an indivisible hard sphere.

An atom has a small, dense nucleus.

Electrons are negative particles in an atom.

Electrons in an atom have wave-like properties.

• Question 2
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Q.

In all atoms of bismuth, the number of electrons must equal the

number of protons

number of neutrons

sum of the number of neutrons and protons

difference between the number of neutrons and protons

• Question 3
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Q.

Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?

α

$\beta$  +

$\beta$

p

• Question 4
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Q.

An orbital is a region in an atom where there is a high probability of ﬁnding

an alpha particle

an electron

a neutron

a positron

• Question 5
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Q.

Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?

1

2

3

4

• Question 6
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Q.

As the elements in Period 2 are considered in order from lithium to ﬂuorine, there is an increase in the

electronegativity

number of electron shells

number of electrons in the ﬁrst shell

• Question 7
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Q.

Which element is classiﬁed as a metalloid?

boron

sulfur

potassium

xenon

• Question 8
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Q.

Strontium and barium have similar chemical properties because atoms of these elements have the same number of

protons

neutrons

electron shells

valence electrons

• Question 9
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Q.

Which element has metallic bonds at room temperature?

bromine

cesium

krypton

sulfur

• Question 10
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Q.

What is the number of electrons shared between the atoms in a molecule of nitrogen, N2?

8

2

3

6

• Question 11
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Q.

Given the equation representing a reaction: H + H → H2

What occurs during this reaction?

A bond is broken and energy is absorbed.

A bond is broken and energy is released.

A bond is formed and energy is absorbed.

A bond is formed and energy is released

• Question 12
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Q.

An atom of which element has the strongest attraction for electrons in a chemical bond?

chlorine

carbon

phosphorus

sulfur

• Question 13
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Q.

Which statement describes a mixture of sand and water at room temperature?

It is heterogeneous, and its components are in the same phase.

It is heterogeneous, and its components are in different phases.

It is homogeneous, and its components are in the same phase.

It is homogeneous, and its components are in different phases.

• Question 14
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Q.

According to the kinetic molecular theory, which statement describes the particles in a sample of an ideal gas?

The particles are constantly moving in circular paths.

The particles collide, decreasing the total energy of the system.

The particles have attractive forces between them.

The particles are considered to have negligible volume.

• Question 15
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Q.

Which sample of matter has the greatest distance between molecules at STP?

N2(g)

C6H14(l)

NH3(aq)

C6H12O6(s)

• Question 16
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Q.

Which electron conﬁguration represents the electrons in an atom of sulfur in an excited state?

2 – 8 – 6

2 – 7 – 7

2 – 8 – 7

2 – 7 – 8

• Question 17
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Q.

Which notations represent atoms that have the same number of protons but a different number of neutrons?

H-3 and He-3

S-32 and S-32

Cl-35 and Cl-37

Ga-70 and Ge-73

• Question 18
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Q.

Which compound has covalent bonds?

H2O

Li2O

Na2O

K2O

• Question 19
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Q.

At which temperature and pressure will a sample of neon gas behave most like an ideal gas?

300. K and 2.0 atm

300. K and 4.0 atm

500. K and 2.0 atm

500. K and 4.0 atm

• Question 20
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Q.

The volumes of four samples of gaseous compounds at 298 K and 101.3 kPa are shown in the table below.

Sample Compounds Volume (L)

1 NH3(g) 44.0

2 CO2(g) 33.0

3 HF(g) 44.0

4 CH4(g) 22.0

Which two samples contain the same number of molecules?

1 and 2

1 and 3

2 and 3

2 and 4

• Question 21
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Q.

Graphite and diamond are two forms of solid carbon at STP. These forms have

different molecular structures and different properties

different molecular structures and the same properties

the same molecular structures and different properties

the same molecular structures and the same properties

• Question 22
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Q.

In the ground state, an atom of which element has seven valence electrons?

sodium

phosphorus

nitrogen

fluorine

• Question 23
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Q.

Which information is sufficient to differentiate a sample of sodium from a sample of silver?

the mass of each sample

the volume of each sample

the reactivity of each sample with water

the phase of each sample at room temperature

• Question 24
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Q.

Which statement explains why NaBr is classified as a compound?

Na and Br are chemically combined in a fixed proportion.

Na and Br are both nonmetals.

NaBr is a solid at 298 K and standard pressure.

NaBr dissolves in H2O at 298 K.

• Question 25
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Q.

Which substance can not be broken down by a chemical change?

ammonia

magnesium

methane

water

• Question 26
30 seconds
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Q.

The degree of polarity of a covalent bond between two atoms is determined by calculating the difference in their

melting points

electronegativities

ionization energies

• Question 27
30 seconds
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Q.

At STP, which property of a molecular substance is determined by the arrangement of its molecules?

half-life

molar mass

physical state

percent composition

• Question 28
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Q.

Which ion in the ground state has the same electron configuration as an atom of neon in the ground state?

Ca2+

Cl-

Li+

O2-

• Question 29
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Q.

The molar masses and boiling points at standard pressure for four compounds are given in the table below.

Which compound has the strongest intermolecular forces?

HF

HCl

HBr

HI

• Question 30
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Q.

Which particle model diagram represents xenon at STP?