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Category 1 Review

Total questions: 100

Worksheet time: 7hrs 34mins

Name
Class
Date
1.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
2.

A scientist spilled a few drops of diluted hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

a)

The baking soda and hydrochloric acid combined, and bubbles formed.

b)

The baking soda absorbed the hydrochloric acid.

c)

Some of the baking soda dissolved in the hydrochloric acid.

d)

The hydrochloric acid evaporated, leaving only the baking soda.

3.

The student observed that the temperature changed from 25°C to 23°C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

a)

One of the original compounds came out of solution.

b)

The solutions reacted chemically.

c)

Some of the water froze into ice crystals.

d)

Rapid evaporation of water occurred, leaving a solid.

4.
When heated, oxygen reacts with copper to form copper oxide:
If this reaction occurs in a sealed container, will the mass of the container and everything in it increase, decrease, or stay the same and why?
a)
The mass will stay the same because the number of each kind of atom stays the same.
b)
The mass will increase because a new kind of molecule is formed.
c)
The mass will decrease because two substances combine to form one substance.
d)
More information is needed to tell if the mass will change.
5.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
6.

For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf overnight. The next morning, the students recorded observations about the metal and the solution in the box below.


Based on their obsevations, can the students correctly conclude that a chemical reaction occurred?

a)

No, because the metal strip was still visible

b)

Yes, because a new material of a different color formed on part of the metal strip

c)

No, because the solution stayed blue

d)

Yes, because the volume of the blue solution stayed the same

7.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
8.
A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?
a)
Heat is added to the sugar crystals.
b)
The sugar melts and becomes a liquid.
c)
Gas is produced as the sugar turns black.
d)
No evidence of chemical reaction is present.
9.
(7.6B) Many processes occur in the digestive system. Which process is best classified as a physical change? 
a)
Saliva converting starch molecules in crackers to simple sugars
b)
Digestive enzymes breaking down proteins into smaller fragments
c)
Bacteria converting lactose into simple sugars in the intestines
d)
Teeth grinding an almond into smaller pieces in the mouth
10.
(6.5C) The chemical equation shown below represents a reaction that produces fuel for certain cars.
CO + H2O ---> CO2 + H2
Which of these represents an element?
a)
CO
b)
H2O
c)
CO2
d)
H2
11.

Which of the following represents a chemical reaction?

a)

a sugar cube dissolving in water

b)

a cake baking in an oven

c)

ice cubes forming in a freezer

d)

ice cream melting in a bowl

12.

A student performs the above reaction during a lab. The student masses the reactants and then performs the reaction. What is the mass (the amount of grams) of the products?

a)

19

b)

300.23

c)

20

d)

21

13.
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?
a)
A dark solid formed on the zinc metal.
b)

The zinc metal remained silver-colored and shiny
c)
The CuSO4 solution turned blue when the zinc metal was added.
d)
None of these
14.
A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids and recorded observations. In which investigation is it LEAST likely that the liquids reacted chemically?
a)
1
b)
2
c)
3
d)
4
15.

A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process.

Which observation of this process provides evidence of a chemical reaction?

a)

Hot water heated the aluminum foil.

b)

The liquid solution changed color.

c)

The pan was lined with aluminum foil.

d)

The hot water cooled.

16.

A student obtains two strips of magnesium, Mg, ribbon that are each 3 cm long. One strip of magnesium is placed in a test tube containing 5 mL of water, and the other strip is placed in a test tube containing 5 mL of hydrochloric acid, HCl. Both liquids are at room temperature. The student's observatioins are recorded in the table.

Which statement is not supported by the student's observations.

a)

A chemical reaction takes place between magnesium and hydrochloric acid.

b)

A gas is released in Test Tube 2.

c)

The substances in both test tubes are reactive only at high temperatures.

d)

Energy is released in the reaction involving hydrochloric acid.

17.

Nitrogen dioxide is a gas that can be generated by emissioins from vehicles and factories. It can also be generated by natural sources, such as forest fires, lightning, and microbial activity in soil. The equation for producing nitrogen dioxide is shown.

Which of these provides evidence that a chemical reaction occurs?

a)

A gas is present.

b)

The total number of atoms remains the same.

c)

The state of matter remains the same.

d)

A brown gas is produced.

18.

Some students in a chemistry lab conducted an investigation in which they added four different solid substances to seperate beakers of water. They stirred the mixtures for one minute and then recorded their observations in the table.

Which substance most likely caused a new substance to be formed when mixed with water?

a)

Substance 1

b)

Substance 2

c)

Substance 3

d)

Substance 4

19.
a)

No, because the metal strip was still visible

b)

Yes, because a new material of a different color formed on part of the metal strip

c)

No, because the solution stayed blue

d)

Yes, because the volume of the blue solution stayed the same

20.
a)

Procedure 1: All the reactants were liquids that evaporated.

Procedure 2: A gas was formed as one product, and it escaped into the air.

b)

Procedure 1: One of the reactants was converted to thermal energy.

Procedure 2: All the products were liquids.

c)

Procedure 1: The reactants were liquid with difference densities.

Procedure 2: The reactants were combined into only one product.

d)

Procedure 1: One of the products was a gas that escaped into the air.

Procedure 2: A gas from the air reacted with one of the other reactants.

21.

A chemcial reaction in which calcium carbonate, CaCO3, is decomposed results in the production of two simpler compounds.

What mass of calcium carbonate, to the nearest hundredth of a gram, is decomposed in this reaction?

a)

49.97

b)

28.00

c)

6.03

d)

21.97

22.

An atom of an element has 36 protons, 36 electrons, and a mass number of 84? How many neutrons?

a)

36

b)

72

c)

48

d)

8

23.

What types of particles are found in the cloud surrounding the atom's nucleus?

a)

positively and negatively charged particles

b)

negatively charged particles only

c)

neutral and positively charged particles

d)

positively charged particles only

24.

6 CO2 + 6 H2O → C6H12O6 + 6 O2

How many carbon atoms in total are present in the reaction?

a)

6

b)

18

c)

12

d)

10

25.
What element is represented in this Bohr Model? 
a)
Carbon
b)
Hydrogen
c)
Aluminum
d)
Lithium
26.
What is the atomic number?
a)
The number of protons in an element
b)
The number of neutrons in an element
c)
The number of protons and neutrons.
d)
The number of protons and electrons.
27.
How many valence electrons does Sodium (Na) have?
a)
1
b)
2
c)
3
d)
4
28.
Each row in the periodic table is called a 
a)
group
b)
period
c)
cluster
d)
unit
29.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
30.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
31.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
32.

Identify the element using the Bohr model.

a)

He

b)

Li

c)

Be

d)

Na

33.

Identify each category below as Metals, Nonmetals, or Metalloids based on the information shown on the data table.

a)

A. Metals B. Nonmetals C. Metalloids

b)

A. Metals B. Metalliods C. Nonmetals

c)

A. Nonmetals B. Metalloids C. Metals

d)

A. Metalloids B. Metals C Nonmetals

34.

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is the mass of this atom?

a)

17

b)

18

c)

32

d)

52

35.
The mass of one proton is greater than the mass of one...
a)
neutron
b)
electron
36.
What is the atomic mass of the atom pictured? 
a)
9
b)
10
c)
18
d)
19
37.
This particle determines what element you have - the elements identity.
a)
electron
b)
proton
c)
neutron
d)
valence shell
38.
What characteristic of an element's atoms ALWAYS determines the element's identity?
a)
the number of neutrons
b)
the number of protons
c)
the atomic mass
d)
the number of valence electrons
39.
a)
2
b)
3
c)
5
40.
Most of the atom is filled with
a)
electrons
b)
empty space
c)
the nucleus
d)
protons
41.
How many energy shells does Barium (Ba) have?
a)
1
b)
2
c)
5
d)
6
42.

If an atom were to LOSE (give up) electrons, then it would become -

a)

negatively charged

b)

postively charged

c)

remain neutral, no charge

d)

losers

43.

If an atom were to GAIN (add) electrons, it would become -

a)

negatively charged

b)

positively charged

c)

remain neutrally charged

d)

21

44.
The only element with no neutrons in its nucleus.
a)
Oxygen
b)
Helium 
c)
Hydrogen
d)
Lithium
45.

What would the charge of an atom that has LOST ONE electron be?

a)

1-

b)

2-

c)

1+

d)

2+

46.

Since atoms have the same number of protons as electrons, an atoms overall charge is _____.

a)

Positive

b)

Depends on its mood

c)

Neutral

d)

Negative

47.
What determines how chemically reactive an element is?
a)
electrons
b)
valence electrons
c)
protons
d)
neutrons
48.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
49.
Which of the following is a compound?
a)
Co
b)
Fe
c)
H
d)
CO
50.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
51.

Looking at the reactants, there is _____ molecule(s) of CH4 and _______ molecule(s) of O2.

a)

1, 1

b)

1, 2

c)

2, 2

d)

2, 4

52.

Looking at the products , there is _____ atom(s) of Oxygen in CO2 and _______ atom(s) of Oxygen in 2H2O.

a)

1, 1

b)

1, 2

c)

2, 2

d)

2, 4

53.

Elements in the same period/row have the same--

a)

# of valence electrons

b)

# of protons

c)

# of energy shells

d)

# of neutrons

54.

How many periods are on the Periodic Table?

a)

6

b)

7

c)

8

d)

9

55.

The mass of the atom is located ---

a)

in the Nucleus

b)

in the Electron Cloud

c)

protons only

d)

neutrons only

56.

Which element is NOT in Period 3 on the Periodic Table?

a)

Na

b)

Ar

c)

P

d)

Ne

57.

The volume of the atom is located in the --

a)

in the Nucleus

b)

in the Electron Cloud

58.

The atoms of a certain element each contain 18 protons and 8 valence electrons.


What is the element's name?

a)

Argon

b)

Krypton

c)

Neon

d)

Sodium

59.

How many protons will the element in Group 7A, Period 4 have?

a)

9

b)

16

c)

34

d)

35

60.

What element has similar properties of Cesium (Cs), but a larger atomic mass?

a)

Magnesium (Mg)

b)

Barium (Ba)

c)

Rubidium (Rb)

d)

Francium (Fr)

61.

Elements in the same group/family--

a)

have the same # of valence

b)

behave the same

c)

have the same # of energy shells

d)

are in the same period

62.

These types of elements are BRITTLE and DO NOT conduct electricity.

a)

Metals

b)

Nonmetals

c)

Metalloids

63.

Which elements have 3 valence electrons?

a)

Scandium

b)

Boron

c)

Aluminum

d)

Lithium

64.

Hydrogen (H) is a --

a)

Metal

b)

Nonmetal

c)

Metalloid

65.

Scandium (Sc) and Calcium (Ca) are both in the same group/family.

a)

True

b)

False

66.

An element is shiny, solid at room temperature, and has two valence electrons. Which of these elements could be in this group?

a)

Lithium (Li)

b)

Strontium (Sr)

c)

Aluminum (Al)

d)

Silicon (Si)

67.

Which of the following is the best description of an atom?

a)

A core of protons surrounded by electrons

b)

Protons and neutrons grouped in loose arrangements

c)

A core of protons and neutrons surrounded by electrons

d)

Protons, neutrons, and electrons grouped in a solid core

68.

What statement about a proton is correct?

a)

A proton has no electrical charge

b)

A proton has a positive electrical charge

c)

A proton has a negative electrical charge

d)

A proton can have either a positive or a negative electrical charge

69.

Valence electrons determine an atom's--

a)

proton number

b)

chemical reactivity

c)

atomic mass

d)

atomic number

70.

Most elements in the Periodic Table are classified as --

a)

Metals

b)

Noble gases

c)

Nonmetals

d)

Reactants

71.
(8.5A) An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?
a)
+25
b)
+30
c)
-25
d)
-30
72.
(8.5A) Which of these best describes one of the subatomic particles that could be found at location X in the model of an atom shown above?
a)
It has mass but no charge.
b)
It has no mass and a positive charge.
c)
It has a large mass and a negative charge.
d)
It has no mass and an equal number of positive and negative charges.
73.
(8.5B) An atom of which element is represented by this model?
a)
Boron (B)
b)
Carbon (C)
c)
Neon (Ne)
d)
Sodium (Na)
74.
(8.5B) When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with? 
a)
The total number of neutrons in the unknown element.
b)
The total number of particles in the nucleus of the unknown element
c)
The number of protons in the nucleus of the unknown element
d)
The number of valence electrons in the unknown element.
75.
(8.5C) A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below.
Which two atoms are of elements in the same group in the periodic table?
a)
Atom 1 and Atom 2
b)
Atom 1 and Atom 4
c)
Atom 2 and Atom 3
d)
Atom 3 and Atom 4
76.
(8.5C) A researcher wants to experiment with an element that reacts like phosphorous (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
a)
Nitrogen (N)
b)
Sulfur (S)
c)
Arsenic (As)
d)
Silicon (Si)
77.
(8.5D) The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
a)
1
b)
2
c)
6
d)
7
78.
(8.5D) Serotonin is a chemical substance that acts as a neurotransmitter. It helps relay messages in the human brain. The formula for one molecule of serotonin is shown below.
C10H12N2O
How may atoms in all are in a molecule of serotonin? 
a)
10
b)
25
c)
24
d)
100
79.
(8.5D) Which information could a student determine from only the chemical formula of a protein? 
a)
The color of the protein
b)
The number of molecules in each sequence that makes up a protein
c)
The physical arrangement of atoms in the structure of the protein
d)
The number of atoms of each element in the protein
80.
(7.5C) The flow of energy in some Australian food chains is modeled in the energy pyramid.
Based on the model, which consumers would receive the greatest amount of energy captured by the producers in their food chains? 
a)
Wedge-tailed eagles
b)
Chuditch
c)
Ring-tailed opossums
d)
Eucalyptus trees
81.
CaCO3 ---> CaO + CO2
In the chemical reaction shown above, the products are best classified as-- (6.5C)
a)
two elements
b)
one element and one compound
c)
two compounds
d)
two compounds and one element
82.
(8.5D) In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HClO3
d)
H2O
83.
Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below.
Which student’s responses are correct?
a)
1
b)
2
c)
3
d)
4
84.
8.5F In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
85.
8.5D How many Hydrogen atoms are on the reactant side of this chemical equation?            
2C2H2 + 5O2  --->  4CO2 + 2H2O
a)
2
b)
4
c)
6
d)
8
86.
8.5D How many Carbon atoms are on the product side of this chemical equation?            
2C2H2 + 5O2  --->  4CO2 + 2H2O
a)
2
b)
3
c)
4
d)
5
87.
8.5F What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
88.
8.5D How many Oxygen atoms are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
89.
Does this chemical equation follow the Law of Conservation of Mass? (Hint: Is it balanced?)       
2C2H2  +  5O2 ---> 4CO2  +  2H2O 
a)
No
b)
Yes
c)
maybe
d)
huh?
90.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
91.

Which of the following examples shows that a chemical reaction has occurred?

a)

A rock breaks into smaller pieces when it is struck with a hammer.

b)

Bubbles form when baking soda is added to vinegar and mixed.

c)

A cup of water turns pink when a few drops of red food coloring are added.

d)

A solid is formed when heat is removed from a sample of water.

92.

Evidence of a chemical reaction includes anything that shows -

a)

a new substance has been formed

b)

a solid has dissolved in a liquid.

c)

an interaction between two gases.

d)

a change in the state of matter.

93.

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

a)

The level of the substance in the beaker is higher after the other liquid is added.

b)

A yellow solid forms and then settles to the bottom of the beaker.

c)

Small white crystals are left behind in the flask that held the first liquid.

d)

The mass of the combined liquids is greater than either original liquid.

94.

Based on the data, which periodic table or tables shows the correct location of Element I?

a)
b)
c)
d)
95.

Which pair of properties describes the elements in Group 18?

a)

They are chemically stable and liquid at room temperature.

b)

They have eight valence electrons and are flammable.

c)

They are magnetic and boil at low temperature

d)

They are gaseous at room temperature and chemically stable.

96.

Based on this information, which of these statements is not true?

a)

A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine

b)

A molecule of lactose contains twice as many atoms as a molecule of fructose does.

c)

A molecule of fructose contains four more atoms than a molecule of glutamine does.

d)

A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

97.

Which of these provides evidence that a chemical reaction occurs?

a)

A gas is present.

b)

The total number of atoms remains unchanged.

c)

The state of matter remains the same.

d)

A brown gas is produced.

98.
6.6A
Some students conducted a lab investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table shown. Which sample is most likely a non metal?
a)
Sample 1
b)
Sample 2
c)
Sample 3
d)
Sample 4
99.

6.6BA balance and a graduated cylinder are used to detemine the density of a mineral sample. The sample has a mass of 14.7g and a volume of 2.2cm3. What is the density of the mineral sample? (Hint: Use the resource sheet and a calculator)

a)

0.15 g/cm3

b)

32 g/cm3

c)

13 g/cm3

d)

6.7 g/cm3

100.

Which statement accurately describes the atoms of a specific element?

a)

An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

b)

A scandium Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

c)

An aluminium, Al, atom contains 27 electrons and 27 protons inside the nucleus.

d)

A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

e)

A Calcium, Ca, atom contains 29 protons inside the nucleus and 29 outside the nucleus

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