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WorksheetsScience Semester Exam Review
Total questions: 52
Worksheet time: 26mins
A scientist is heating up an unknown sample. Assuming the substance is a solid and the temperature is rising what is occurring at Point 2 in the graph?
Melting
Condensation
Freezing
Evaporating
A student prepared diagrams to model atoms of two elements. Atoms of which two elements are represented by these models?
Oxygen, O, and Neon, Ne
Silicon, Si, and Phosphorus, P
Fluorine, F, and Neon, Ne
Beryllium, Be and Boron, B
The diagram below shows a model of an atom. Which of the following could describe a subatomic particle found at location X in the diagram?
It is located inside the nucleus and has a negative charge
It has mass and a negative charge
It is located outside the nucleus in an electron cloud
It is located inside the nucleus and has a positive charge
Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the Periodic Table and then classified each element as a metal, a nonmetal or a metalloid. Which table is completed correctly?
Option D
Option C
Option B
Option A
Identify the 2 elements that will conduct electricity AND are found in the same period.
Lithium and Beryllium
Nitrogen and Neon
Carbon and Nitrogen
Lithium and Nitrogen
Students performed a lab investigation on chemical reactions. The students put on goggles and plastic gloves and then followed the steps below. Which observation would indicate that a chemical reaction occurred?
The vinegar took the shape of the container in step 1
The steel wool changed shape during step 6
The temperature of the vinegar increased during step 4
The steel wool sank into the vinegar in step 3
Carbon dioxide (CO2) is a compound with molecules that consist of one Carbon atom and two Oxygen atoms. Why is carbon dioxide a compound and not an element?
Carbon dioxide contains multiple Oxygen atoms
Carbon dixoide consists of more Oxygen atoms than Carbon atoms
Carbon dioxide consists of more than 1 element making it a compound
Carbon dioxide is a gas
Which of the following substances listed are pure substances?
None of these are pure substances
Option I only
All 4 are pure substances
Option I and II only
During an investigation, a student combined the 2 clear colorless solutions shown below in the image. 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?
The solutions reacted chemically
Some of the water froze into ice crystals
Rapid evaporation of water occurred, leaving a solid
One of the original compounds came out of solution
The formula for caffeine is shown below. Based on the formula we can determine that one molecule of caffeine contains which of the following?
8 Carbon atoms, 10 Hydrogen atoms, 4 Nitrogen atoms and 2 Oxygen atoms
1 Carbon atom, 8 Hydrogen atoms, 10 Nitrogen atoms, and 2 Oxygen atoms
10 Carbon atoms, 8 Hydrogen atoms, 10 Nitrogen atoms and 4 Oxygen atoms
8 Carbon atoms, 10 Hydrogen atoms, 2 Nitrogen atoms, and 4 Oxygen atoms
A student combined powdered paint with water to make a small amount of a blue liquid paint mixture. The student left the paint mixture in an open container. Several days later the student found the container and observed that changes had occurred. What most likely happened to the mixture.
The liquid paint mixture was lighter in color after some water evaporated.
The paint evaporated, leaving only clear water in the container
The container was empty after the mixture evaporated into the air
The water evaporated, leaving only a dry blue solid in the container
Students observe a glass of ice and water. The glass is dry on the outside. After 10 minutes students see drops of water on the outside of the glass. Which statement best explains the students' observations?
The water moved to the outside surface through tiny holes in the glass.
The ice in the glass melted and caused the water to overflow the gas
The cold water inside the glass rises and then slides down the outside of the glass
The water vapor in the air changes to a liquid when it touches the cold glass
At point B what is the temperature of this unknown sample
0
20
90
60
Which information could a student determine from only the chemical formula of a protein?
The number of atoms of each element in the protein
The number of molecules in each sequence that makes up a protein
The physical arrangement of atoms in the structure of the protein
The color of the protein
In ancient times, people believed that there were four elements- earth, air, fire and water - and all matter was made up of them. Today it is known that elements are something entirely different. Why isn't water an element?
Water does not have the ability to react with an type of substance
The chemical formula for water can vary
Water is a compound that contains the elements hydrogen and oxygen
Water is a liquid and elements do not occur in liquid form.
Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table below. Based on these observations which sample is most likely a nonmetal?
Sample 2
Sample 1
Sample 4
Sample 3
One of the properties that makes Copper, Cu, useful for household wiring is its ability to conduct electricity. Which other element is most likely to conduct electricity?
Bromine, Br
Gold, Au
Nitrogen, N
Radon, Rn
Look at the model of an atom below. Identify the name of the element based on the model.
None of the above
Boron
Lithium
Carbon
Identify the following as an element, compound or mixture:
Element
Compound
Mixture
What does this represent?
Element
Compound
Mixture
Candy
Identify the following as either physical or chemical change: Fireworks going off
Physical
Chemical
Identify the following as either physical or chemical change: Tearing paper
Physical
Chemical
Identify the following as either physical or chemical change: Iron Rusting
Physical
Chemical
Identify the following as either physical or chemical change: Ice melting
Physical
Chemical
Materials that are present at the end of a reaction are called:
molecules
reactants
elements
products
Any substance that undergoes a chemical change in a given reaction is called:
atom
product
molecule
reactant
Which scientific law states that an atom cannot be created or destroyed:
Law of Motion
Law of Gravity
Law of Conservation of Matter
Law of Conservation of Mass
Is this chemical equation balanced or unbalanced?
Unbalanced
Balanced
How many Hydrogen atoms are in this chemical formula?
12
0
24
6
A piece of gold jewelry is melted over a flame and becomes a liquid. Is this a sign of a chemical reaction?
yes
no
In the acronym 'City Girls Love Their Phones' the 'P' in phones stands for what?
purple color
phosphorus formation
paper formation
precipitate formation
In the acronym 'City Girls Love Their Phones' the 'G' stands for what?
gallium production
green color
gone
gas production
In the acronym 'City Girls Love Their Phones' the 'C' stands for what?
changing matter
color change
chemical reaction
calcium deposit
In the acronym 'City Girls Love Their Phones' what does the 'L' stand for?
less matter
light production
lasting reaction
liquid formation
In the acronym 'City Girls Love Their Phones' what does the 'T' stand for?
transforming substance
testing substances
trace particles
temperature change
The big number in front of a chemical formula is called a coefficient and tells you the number of molecules.
True
False
The little drop down number after an element symbol in a chemical formula is called a subscript. It tells you how many atoms of that element are in the molecule.
True
False
Choose all the items that are elements.
Water
Air
O
NaCl (table salt)
Sulfur
Students in Mrs. Clark's science class are investigating a substance that has the following properties -shiny -bends easily -hard, not easily broken Based on these properties how would you classify the substance?
Metal
Nonmetal
Metalloid
Groups run:
left to right
up and down
Periods run:
left to right
up and down
Which two elements share common characteristics based on the periodic table?
Argon and Neon
Calcium and Bromine
Chlorine and Sulfur
Sodium and Magnesium
Metalloids are on the:
Stairstep
Left side
Right Side
Nonmetals are on the:
Left side
Right Side
Stairstep
A student is studying a mystery substance. It breaks easily. It has a very dull luster. It doesn't conduct any electricity. What is the most likely substance this is?
Metal
Nonmetal
Metalloid
period
A subatomic particle that has a negative charge
Found in group two of the periodic table; highly reactive
Elements that occur in vertical columns on the periodic table.
A horizontal row of elements in the periodic table
atomic number
a subatomic particle that has a negative charge
gas at room temperature, low boiling point
number or protons and neutrons
the number of protons in the nucleus of an atom
neutron
A subatomic particle that has a negative charge
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
not able to conduct heat or electricity, little to no metallic luster
A small particle in the nucleus of the atom, with no electrical charge
A subatomic particle that has a negative charge
neutrons
electrons
protons
nobles gases
Number of protons and neutrons
noble gases
atomic mass
atomic number
Non-metals
How many valence electrons in this diagram:
5
3
7
1
How many valence electrons in this diagram:
5
7
1
3
