Chemistry 1-3 Exam

the sac

All matter is composed of elements. Approximately how many elements are there?

100

What type of element has the following general properties: solid at room temperature, high luster, good conductor of heat and electricity, malleable and ductile?

metal

An ion is an electrically charged atom or group of atoms.

true

All gases exist as diatomic molecules

false

Water is a chemical element

false

More substances exist as compounds than as element

true

elements are the basic building blocks of all substances

true

The halogens are the only periodic group that contains all three phases of matter under normal conditions.

 

True

Bromine is a solid at room temperature.

False

Groups or families of elements are arranged in rows in the periodic table. These elements have similar chemical properties.

 

False

The elements in Groups 1B – 8B are known as the transition elements.

 

True

Alkali metals are shiny, ductile, good conductors of heat and not very reactive.

 

False

Which type of element has the following general properties: low melting point and density, lacks luster, poor conductor of heat and electricity, and brittle?

 

nonmetal

List the following in order of increasing number of oxygen atoms represented:

A) 12 CaCO3

B) 8 Ca(OH)2

C) 6 Ca3(PO4)2

D) Ca(NO3)2

 

D < B < A < C

On the periodic table vertical columns contain elements with similar properties. These vertical columns are called ___.

groups

The elements on the current periodic table are placed in order of increasing ___.

 

atomic number

The halogens are in group ___.

7A

The alkaline earth metals are in group ___.

2A

The alkali metals are in group ___.

1A

Which of the following is a member of noble gases?

 

neon

Which symbol represents a transition metal?

 

Tc

Which is a nonmetal?

S

The smallest particle of an element that can exist is called a(n) ___.

atom

Which is a metalloid?

B

Which element is not reactive?

 

Neon

Which element forms diatomic molecules?

 

Chlorine

Which element forms diatomic molecules?

 

Bromine

A distinct substance composed of two or more elements combined chemically in a definite proportion by mass is a

 

compound.

The charge of a cation is ___.

 

positive

The symbol for cobalt is ___.

 

Co

How many different elements are present in the compound CoCl₂?

2

How many different elements are present in the compound Fe₂(SO₄)₃?

3

How many atoms of oxygen are indicated in the formula Fe(NO₃)₃?

9

The smallest particle of an element that can enter into a chemical reaction is a(n) ___.

atom

How many atoms are indicated in the formula Ca₃(PO₄)₂?

13

What is the total number of hydrogen atoms present in the compound CH₃COOH?

4

What is the total number of atoms present in the compound represented as Mg(NO₃)₂?

9

How many atoms of hydrogen are present in the compound represented as Al(H₂PO₄)₃?

6

Which of the following is a compound?

water

What is the total number of oxygen atoms present in Fe₂(SO₄)₃?

12

Which is a characteristic of all nonmetals?

 

poor conductors of heat

The number of nonmetallic atoms in Al₂(SO₃)₃ is ___.

12

If an element is a metal, one would expect it to be

ductile

Which would be used in semiconductors?

 

silicon

Most elements are rare. How many elements make up approximately 99% of the mass of the earth’s crust, oceans, and atmosphere?

10

K is the symbol for the element ___.

potassium

Which of the following represents an element?

N₂

Which is not a characteristic of metals?

brittle

Which of the following formulas contains the fewest oxygen atoms?

Na₂CO₃

The formula C₃H₅(OH)₃ contains

 

14 total atoms.

The symbol for one crystalline form of sulfur is S₈. This symbol indicates

 

one molecule composed of eight atoms.

Which of the following is an anion?

Cl-

Which element is not a gas at normal temperature and pressure?

carbon

Which of the following is a cation?

 

Fe⁺³

The symbol P corresponds to the element ___.

phosphorus

The most abundant element in the earth’s crust, oceans, and atmosphere is ___.

oxygen

Which does not exist as diatomic gas?

bromine

Which of the following is a metalloid?

Si

Which of the following is the correct symbol for iron?

Fe

Which of the following cannot be broken down by chemical or physical means?

element

Which element is malleable, ductile, and a good conductor of electricity?

Au

Which element is brittle and a poor conductor of electricity?

S

The smallest uncharged individual unit of a compound is a(n) ___.

molecule

The ultimate particle of water is a(n) ___.

molecule

An ionic compound is held together by

 

attractive forces between ions of different charges.

How many atoms of calcium are indicated in the formula Ca(NO₃)₂?

1

Which element is a liquid at room temperature?

Bromine

The nitrate group is NO₃^–. How many nitrate groups are in the formula NaNO₃?

1

The sulfate group is SO₄^–2. How many sulfate groups are in the formula Fe₂(SO₄)₃?

3

Palladium is a member of the

 

transition metals.

How many hydrogen atoms are in the molecule C₃H₅(OH)₃?

8

Which cannot be broken down chemically or physically into a simpler substance?

copper

Which is the most abundant element in the universe?

hydrogen

Which chemical symbol is properly written?

Cu

Which of the following is a noble gas?

argon

Which of the following is an alkali metal?

sodium

Which of the following is an alkaline earth metal?

magnesium

Which element is a liquid at room temperature?

mercury

Which of the following is a halogen?

chlorine

Which of the following is a transition element?

manganese

Which of the following elements is from a representative group?

S

Which element of the following is most similar to calcium?

strontium

Which element of the following is most similar to bromine?

chlorine

Which of the following is best classified as a semiconductor?

boron

Which of the following does not exist as a diatomic gas?

argon

What is the symbol of the element that is classified as a metalloid and is in Group IVA and period 3?

Si

Element with the atomic number 24 can be described as

 

ductile.

What is the atomic number of potassium?

19

The majority of the elements are ___.

metals

What is the name of the element with an atomic number of 24?

chromium

What is the symbol of the element that is classified as an alkali metal and is in period 4?

K

What is the name of the element with an atomic number of 80?

mercury

One of the properties of metals is their ductility. This means that

 

they can be drawn into wires.

Which of the following alternatives does not represent a molecule?

Ga

Consider the chemical formula for one molecule of methane, CH₄. If instead of one molecule we had 10 molecules of methane, how many carbon atoms would be present?

10

Consider the chemical formula for one molecule of table sugar, C₁₂H₂₂O₁₁. If instead of one molecule of sugar we had 5, how many oxygen atoms would be present?

55

Consider the chemical formula for one unit of aluminum sulfate, Al2(SO4)3. How many total atoms would be present in 22 units of aluminum sulfate?

374

One unit of potassium oxide contains 2 atoms of potassium for every atom of oxygen. What is the chemical formula for potassium oxide?

 

K₂O

One unit of aluminum sulfide contains 2 atoms of aluminum for every three atoms of sulfur. What is the chemical formula for aluminum sulfide?

 

Al₂S₃