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WorksheetsChemistry #2 Test Review
Total questions: 70
Worksheet time: 36mins
Correctly identify the parts of the atom that are shown in the model.
A. Proton
B. Electron
C. Neutron
A. Neutron
B. Electron
C. Proton
A. Neutron
B. Proton
C. Electron
A. Proton
B. Neutron
C. Electron
Look at the drawing. What is the mass number of this atom of Beryllium?
4 amu
5 amu
9 amu
13 amu
The blue circles in the center of the model represent Neutrons. What do the red circles represent?
protons
neutrons
electrons
quarks
What is NOT true of electrons?
They have a negative charge.
They have very little mass.
They are found in the nucleus of an atom.
They are likely to be found aroudn the nucleus within the electron cloud.
What element(s) does this chemical symbol represent?
flourine & elementium
iron
francium
fermium
Match the information for the element shown here.
Atomic Mass
39
Atomic Number
19
# of Protons
19
# of Electrons
19
# of Neutrons
20
Which of these best describes one of the subatomic particles that could be found in the nucleus?
It has mass but no charge.
It has no mass and an equal number of positive and negative charges.
It has a large mass and a negative charge.
It has no mass and a positive charge.
Which letter in this model of an atom represents a neutron?
a
b
c
d
What element does this atomic model represent?
Carbon
Sodium
Boron
Sulfur
How many electrons does an atom with an atomic number of 20 and a mass number of 42 have?
20
22
42
62
Neon (Ne) has ___ electrons in its outer energy level?
2
10
8
18
Boron (B) has ___ electron clouds, or energy levels.
4
5
2
1
The nucleus of any atom has what type of charge?
positive
negative
neutral/no charge
battery
A neutral atom has the same number of ...
neutrons and electrons
neutrons and protons
protons and electrons
protons, neutrons, and electrons
An atom that has 12 protons, 14 neutrons, and 12 electrons has an atomic number of...
12
14
26
38
How many electrons are in each energy level of Chlorine?
2, 8, 2
2, 8, 7
2, 8, 18
2, 15
According to the Periodic Table of Elements, which of the following best represents a carbon atom?
How many electrons are in a single atom of Bromine (Br)?
45
35
79.904
80
How many protons does Mercury (Hg) have?
200
80
121
20
How many neutrons does Chlorine (Cl) have?
17
35.453
35
18
What subatomic particles make up the mass of an atom?
Protons & Electrons
Electrons & Neutrons
Protons
Protons & Neutrons
Which of the following statements is correct for the elements shown?
Litium has 6.9 protons
Lithium has the least number of protons
Sodium has the most number of protons
Potassium has 39.1 protons
An element contains only one kind of ...
atom
molecule
compound
mixture
What is the mass number of Oxygen?
15.999
16
7
8.999
An atom consists of 7 neutrons, 7 electrons and a number of protons. What is the mass number?
14
21
7
49
Si represents ...
silicon
sulfur & iodine
silver
silver & iodine
A student is studying Lithium, a highly reactive Alkali metal. Which characteristic of Lithium is most closely related to its chemical reactivity?
it has 3 electons
it has 1 valence electron
is has 2 energy levels
it has 3 protons
What part of an atom is responsible for the atom's chemical reactivity?
# of electrons
# of electron energy levels
# of valence electrons
A certain atom has a nucleus with 6 protons, 6 neutrons & 6 electrons orbiting the nucleus. This atom is a form of the element
Calcium (Ca)
Carbon (C)
Magnesium (Mg)
Silicon (Si)
Identify the atom that has 11 protons, 10 electrons, and 11 neutrons.
Neon (Ne)
Sodium (Na)
Magnesium (Mg)
Aluminum (Al)
Which statement correctly describes the atoms of a specific element?
Aluminum (Al) has 13p, 13e, & 14n
Boron (B) has 5p, 5e, & 5n
Silicon (Si) has 28p, 28e, & 14n
Hydrogen (H) has 1p, 1e, and & 1n
Identify the statement below that correctly describes an atom of Argon.
The atomic number is 18 & there are 40 particles in its nucleus.
The atomic number is 18 & there are 18 particles in its nucleus.
The atomic number is 39.948 and the atomic mass is 18.
Argon has 18 protons, 18 electrons, and 21.948 neutrons.
A blue liquid was added to a clear liquid. Which evidence that a chemical reaction may have occurred?
the solution turned light blue
the temperature remained the same
solid particles formed
the volume increased
According to the law of conservation of mass, the total mass of the reacting substance is ...
always more than the total mass of the products.
always less than the total mass of the products.
sometimes more and sometimes less than the total mass of the products.
always equal to the total mass of the products.
When elements form mixtures, the elements ...
keep their original properties.
react to form a new substance with new properties.
combine in a specific mass ratio.
always change their physical state.
Which of the following is an example of a chemical change?
Filling up a balloon with hot air.
Taking a glass of water and freezing it by placing it in the freezer.
A plant collecting sunlight and turning it into food.
Your dog ripping up your homework.
Evaporation of water is a ___ change.
physical
chemical
A chemical change is different than a physical change because in a chemical change ...
chemicals are used.
molecules do not physically touch.
a new substance is formed and in a physical change no new substance is formed.
the change can be seen but a physical change cannot.
Which of the following is a chemical change?
Salt dissolving in water
A tire inflating with air
A popsicle melting
A car rusting
Which of the following observations would indicate that an exothermic chemical reaction is taking place?
Heat is given off
Bubbles are formed
An odor is produced
A color change occurs
Which of the following is a chemical change?
Water boiling
Paper being cut
Ice melting
Iron rusting
A physical change is taking place when ...
a piece of paper burns
onions are chopped
a piece of fruit rots
a nail rusts
Water vapor is the air turns a liquid water in the form of rain. This is an example of a ...
chemical change
physical change
Three examples of physical changes are ...
burning gasoline, rotting of an egg, & exploding of fireworks.
freezing of water, evaporation of gasoline, & rusting a nail.
boiling water, bursting of a balloon, & crumpling a paper.
sawing of wood, crusing a can, & toasting a marshmellow.
Four students were asked to complete a table for a science assignment. Each student selected one chemical element from four different groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid. Which table was completed correctly?
Why are elements placed in the same group (family)?
they have a similar number of valence electrons and identical physical and chemical properties
they have the same number of valence electrons and identical physical and chemical properties
they have the same number of energy levels and similar physical and chemical properties
they have the same number of valence electrons and similar physical and chemical properties
An element is located on the periodic table according to ...
when it was discovered.
its physical and chemical properties.
its chemcial name.
its chemical symbol.
The table lists characteristics for atoms of two elements. Which of the following statements best describes the reactivity of the two elements?
Neon is more reactive than rubidium because neon has 8 valence electrons.
Neon is more reactive than rubidium because neon is a noble gas.
Rubidium is more reacitve than neon becuase rubidium is a metal.
Rubidium is more reactive than neon because rubidium has only one valence electon.
An unknown element is a solid that is brittle, lacks luster, and has six valence electrons. In which group of the periodic table would the unknown element be found?
Group 1
Group 15
Group 2
Group 16
Using the Periodic Table of Elements, which of the following statements about Krypton IS NOT true?
The symbol is Kr.
It is found in the same group as mercury and gold.
It is one of the noble gases.
It is found in the same group as helium and argon.
An element has a metallic-gray appearance. It also has the properties of both a metal and a nonmetal. In which section of the periodic table indicated above would the element most likely be found?
1
2
3
4
What do the elements A & B have in common?
atomic number
energy levels
valence electrons
neutrons
Why do the noble gases NOT form compounds easily?
They have empty outer energy shells.
They have seven electrons in the outer energy shells.
They do not have electrons
Their outer energy shells are completely filled with electrons.
Which of the following elements do not usually react with other elements?
Carbons
Noble gases
Halogens
Transition metals
Across a period of elements in the periodic table, the number of valence electrons...
is the same for all elements in the periodic table.
is equal to the period's number.
depends on the atomic mass of the elements.
increases from left to right.
Which element chemically reacts in a way similar to the way the element chlorine (Cl) reacts?
Si
O
Xe
I
You are studying a sample of an element. You determine that the element's atoms have seven valence electrons. Select the statement that best describes the elements properties.
It is a noble gas and is unreactive.
It is a transition metal & is shiny and a good conductor.
It is unreactive.
It is a nonmetal, very reactive, and a poor conductor of electric currents.
Elements in the same family (group) on the periodic table...
have similar properties.
have unrelated properties.
have identical properties.
have the same number of total electrons.
Which of the formulas contain equal numbers of nitrogen atoms?
Formulas I and III
Formulas I and IV
Formulas II and III
Formulas I, II, and V
The equation below represents a chemical reaction that occurs in living cells.
C6H12O6 + 6O2 --> 6CO2 + 6H2O + energy
How many atoms are represented in the reactants of this equation?
6
12
24
36
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 many atoms in all (total atoms) are in a molecule of serotonin?
4
5
25
29
Which information could a student determine from only the chemical formula of a protein?
The color of the protein
Determines the shape and function of the protein
The physical arrangement of the atoms in the structure of the protein
The number of atoms of each element in the protein
How many atoms of oxygen are in a molecule of glucose 2C6H12O6?
6
12
24
48
Strontium phosphate, Sr3(PO4)2, is a crystalline substance used in medicine and industry. How many phosphorus atoms are represented in the formula for Sr3(PO4)2?
2
3
4
8
All of the following reactions are correctly balanced except
2C2H2 + 5O2 ➡ 4CO2 + 2H20
4Fe +3O2 ➡ 2Fe2O3
NaHCO3 ➡ NaCO3 +H2O + CO2
2CH3OH + 3O2 ➡ 2CO2 + 4H2O
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 below.
Based on their observations, can the students correctly conclude that a chemical reaction occurred?
No, because the metal strip was still visible.
Yes, because a new material of a different color formed on part of the metal strip.
No, because the solution stayed blue.
Yes, because the volume of the blue solution stayed the same.
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?
The shape of the coal changes.
Oxygen is present.
A new substance is produced.
Coal is made up of more than one element.
A teacher asks a student to write the chemical equation for photosynthesis. The student’s response if shown below.
CO2 + H2O ➡ C6H12O6 + O2
The equation is not balanced correctly. Which of these is a balanced equation for photosynthesis?
12CO2 + H2O ➡ C6H12O6 + O2
CO2 + 9H2O ➡ C6H12O6 + O2
CO2 + H2O ➡ 3C6H12O6 + O2
6CO2 + 6H2O ➡ C6H12O6 + 6O2
As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedures. They measured the mass of each substance before and after each reaction. The table shows their observations. Assuming the students did not make any careless errors, what likely explains these changes in mass?
Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.
Procedure 1: One of the reactants was converted to thermal energy.
Procedure 2: All the products were liquids.
Procedure 1: All the reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.
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.
Some students in a chemistry lab conducted an investigation in which they added four different solid substances to separate 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?
Substance 1
Substance 2
Substance 3
Substance 4
