Gen Chem Chapter 1-3 HW Questions

Which of the following states of matter is portrayed by the following description: assumes the shape of its container because it has a definite volume but no specific shape?

liquid

Italian dressing contains olive oil and vinegar, which will separate out from each other if left to sit. This makes the dressing a?

heterogeneous mixture

Some liquid in a jar can be separated by physical means into two separate liquids, which can then be separated no further. The liquid is a:

mixture

A deicing agent, calcium chloride, is an example of a?

compound

A gold bar is an example of a?

element

Apple juice is an example of a?

mixture

Gasoline is composed of a variety of different liquid hydrocarbons, which do no separate as time passes. Gasoline is an example of a ?

solution

Salsa is an example of a?

mixture

A salad dressing contains oil, vinegar, and water, which separates into an oil layer and a vinegar and water layer if left to sit. When this salad dressing is thoroughly shaken, it is an example of a ____.

heterogeneous mixture

Nitrogen monoxide (NO) is a colorless gas toxic to humans above 25 ppm in air. Nitrogen monoxide is a ____?

covalent (molecular) compound

Raw milk contains water, casein, as well as milkfat. Cream rises to the top of the milk, where it can be skimmed off leaving behind skim milk. Raw milk is an example of a ___?

heterogeneous mixture

To create a colored plastic, copper phthalocyanine pigment is added to molten polystyrene, with the pigment molecules dispersing uniformly throughout the melt. This is an example of a ____?

homogeneous mixture

Which of the following are chemical properties of matter?

flammability

Which of the following is a pure substance that can be broken down into simpler substances by chemical means?

compound

Which one of the following would be a physical property of glucose?

In it pure form, it is a white powder

Which one of the following would be a chemical property of a sample of neon gas?

It is inert

Which of the following is a physical change?

tearing a piece of paper

A white powder mixture is placed into water. Some of the powder sinks to the bottom of the container, some rises to the top.

The separation of the powder mixture is an example of?

a physical change

Magnesium metal, a grey solid, is heated in a crucible in the presence of oxygen. A white powder is collected from the crucible. This is an example of?

a chemical change

In the process of making biofuel from corn, the corn is ground, mixed with water, and then enzymes are added to hydrolyze then starch into smaller sugar molecules. In a subsequent step, a microorganism ferments the sugars into ethanol and carbon dioxide.

The ethanol is further distilled for use as a biofuel. In this process ____ is an example of a chemical change.

fermenting the starch

Which is not one of Dalton’s hypotheses of atomic theory?

the atoms of one element are the same as atoms of another element

The nucleus of an atom contains ?

protons and neutrons

Which subatomic particle has a greater mass?

proton

Which subatomic particle is found in the nucleus and has a neutral charge?

neutron

Which two particles of the atom have nearly identical masses?

a proton and a neutron

Which subatomic particle is found outside the nucleus and has a negative charge?

electron

The net charge on an atom of a given element changes as _____ are added or removed.

electrons

Which of the following statements about subatomic particles are false?

I. Neutrons reside inside the nucleus

II. The atomic number is equal to the number of neutrons in the nucleus of an atom

III. Electrons are more massive than protons

II and III only

Which of the following statements about subatomic particles are true?

I. Protons are neutrons have charges of opposite signs but the same magnitude

II. Protons and neutrons have about the same mass

III. A neutral atoms always has the same number of neutrons and electrons

II only

What does the mass number of an atom represent?

the total number of protons and neutrons in the atom

What is the atomic symbol and mass number for an atom containing 1 proton and 1 neutron?

²H

Which of the following pairs represent isotopes?

²⁸Si and ²⁹Si

What is the atomic symbol and mass number for an atom containing 15 protons and 16 neutrons?

³¹P

Which of the following would be an isotope of ¹⁴C?

¹²C

What is the atomic symbol and mass number for an atom containing 19 protons and 21 neutrons?

40 K

What is the atomic symbol and mass number for an atom containing 26 protons and 31 neutrons?

57 Fe

Which of the following would be an isotope of 16 O?

18 O

What is the atomic symbol and mass number for an atom containing 82 protons and 126 neutrons?

208 Pb

How many neutrons are in a ⁴He atom?

2

Determine the atomic number for an isotope where the mass number is 78 and the number of neutrons is 49 per atom

29

Calculate the mass number for an atom of calcium containing 20 protons and 27 neutrons.

47

What is the correct formula of the lithium ion?

Li+

What is the correct formula of the magnesium ion?

Mg 2+

The net charge on an atom of a given element changes as ____ are added or removed?

electrons

Atoms from which of the following pairs are most likely to form an ionic bond?

iron and chlorine

Atoms from which of the following pairs are most likely to form an ionic bond?

sodium and oxygen

Provide the correct name for AlBr 3

aluminum bromide

Provide the correct name for AlF 3

aluminum fluoride

Provide the correct name for BaCl 2

barium chloride

Provide the correct name for CoCl 2

cobalt (II) chloride

Provide the correct name for CuBr

copper (I) bromide

Provide the correct name for Au2O3

gold (III) oxide

Provide the correct name for Al(NO3)3

aluminum nitrate

Provide the correct name for Ba(HSO4)2

barium hydrogen sulfate

Provide the correct name for Ba(NO2)2

barium nitrite

Provide the correct name for CoPO4

cobalt phosphate

Provide the correct name for Cr(NO3)2

chromium(II) nitrate

Provide the correct name for MnSO3

manganese(II) sulfite

Write the chemical formula for barium phosphate

Ba3 (PO4) 2

Write the chemical formula for aluminum acetate

Al (C2H3O2) 3

Write the chemical formula for chromium (III) oxide

Cr2O3

Write the chemical formula for copper (I) bromide

CuBr

Determine the correct formula for manganese (II) fluoride

MnF2

An atom has nine protons and ten electrons. This makes is:

an ion

Which of the following is most likely to form a +2 ion?

Mg

Determine the number of protons (p) and electrons (e) in Mg2+

12 p, 10 e

Determine the number of protons (p) and electrons (e) in N3-

7 p, 10 e

Determine the number of protons (p) and electrons (e) found in a Se-2 ion

34 p, 36 e

Which of the following is most likely to make a -3 ion?

P

What is the correct formula of the aluminum ion?

Al 3+

What is the correct formula of the calcium ion?

Ca 2+

Which of the following species has the same number of electrons as Cl-?

S 2-

Which of the following species has the same number of protons as Fe 3+?

Fe 2+

Which of the following atoms below has/had five valence electrons?

N

Write the chemical formula for the acetate ion

C2H3O2-

Write the chemical formula for the bicarbonate ion?

HCO3-

Write the chemical formula for the nitrite ion?

NO2-

III

II

II

III

IV

III

IV

I

IV

Orbital diagram for B

Orbital diagram for Ar

Orbital diagram for C

Orbital diagram for He

Mn

Ge

The ground state electron configuration of an Al atom is

1s2 2s2 2p6 3s2 3p1

Write the complete ground-state electron configuration of Be

1s2 2s2

Write the complete ground-state electron configuration of He

1s2

Write the complete ground-state electron configuration of beryllium

1s2 2s2

Write the complete ground-state electron configuration of nitrogen

1s2 2s2 2p3

Write the complete ground-state electron configuration of carbon

1s2 2s2 2p2

Write the complete ground-state electron configuration of sodium

1s2 2s2 2p6 3s1

Write the complete ground-state electron configuration of chlorine

1s2 2s2 2p6 3s2 3p5