WorksheetsScience Midterm Exam 2025 (M)
Total questions: 28
Worksheet time: 14mins
Name
Class
Date
1.
First Name
4 lines
2.
Last Name
4 lines
3.
YOUR CLASS PERIOD
a)
1st
b)
3rd
c)
4th
d)
5th
e)
6th
4.
A student prepared diagrams to model atoms of two elements. Atoms of which two elements are represented by these models?
a)
Oxygen, O, and Neon, Ne
b)
Fluorine, F, and Neon, Ne
c)
Silicon, Si, and Phosphorus, P
d)
Beryllium, Be and Boron, B
5.
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?
a)
It has mass and a negative charge
b)
It is located outside the nucleus in an electron cloud
c)
It is located inside the nucleus and has a positive charge
d)
It is located inside the nucleus and has a negative charge
6.
During an investigation students were given data for several cleaning products. The data they recorded is shown in the table below.
Which statement describes the motion of the particles in the carpet cleaner when enough thermal energy is added to make it boil?
a)
The particles stop moving
b)
The particles move slowly and farther apart
c)
The particles move faster and farther apart
d)
The particles move at a constant rate while condensing
7.
Which of the following substances listed are pure substances?
a)
Option I only
b)
Option I and II only
c)
All 4 are pure substances
d)
None of these are pure substances
8.
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?
a)
Sample 1
b)
Sample 2
c)
Sample 3
d)
Sample 4
9.
A group of students were asked to create a model showing a phase change. Their models are shown in the image below.
Which of the following particle models correctly identifies the phase change of ice to water?
a)
A
b)
B
c)
C
d)
D
10.
A student is trying to create a model that accurately depicts the formation of Ammonia. The student finds in discovers the reaction produces 2 Ammonia molecules. It is created by combining 2 atoms of Nitrogen and 6 atoms of Hydrogen.
Below are 4 different versions of the model the student created. Which model is the only one that correctly shows the correct chemical equation of Ammonia?
a)
A) because the number of reactants and products are the same and the product is H2O
b)
B) because there are more Hydrogen present in the reactants and this means the equation has the same amount of mass on each side
c)
C) because the number of reactants and products are the same and this means the equation has the same amount of mass on each side
d)
D) because the number of reactants are more than the products and this means the equation is balanced
11.
An unknown substance is being heated in the laboratory. The graph below shows the temperature rising as the substance changed phases.
Based on the table showing Vaporization Temperatures what is the identity of the unknown substance?
a)
Uranium
b)
Plutonium
c)
Neptunium
d)
None of the above
12.
A magnet can separate iron shavings and a pile of sand mixed together. Due to the fact that these substances can be physically separated this means the iron shavings and sand could be identified as?
a)
A pure substance because only pure substances can be physically separated
b)
A heterogenous mixture because it can be physically separated and the components do not all appear the same
c)
A compound because only compounds can be physically separated
d)
An element because Iron appears on the Periodic Table
13.
COS 3
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.
The diagram below shows Hydrogen and Oxygen chemically bonding together to form water.
Which statement best represents why water is not considered an element?
a)
Water does not have the ability to react with an type of substance
b)
Water is a compound that contains the elements Hydrogen and Oxygen chemically bonded together
c)
Water is a mixture formed by the elements physically combining
d)
Water is a liquid and elements do not occur in liquid form.
14.
COS 3
Which list correctly describes the gases in containers R, S and T?
a)
R =element S = compound T = mixture
b)
R =compound S= element T= mixture
c)
R=element S=mixture T=compound
d)
R=mixture S=element T=compound
15.
COS 1
During a lab investigation a scientist heats a solid substance. The scientist observes that the solid has two different boiling points. The scientist is able to separate the two resulting liquids. Which statement best classifies the original substance?
a)
It was an atom
b)
It was an element
c)
It was a mixture
d)
It was a compound
16.
COS 4:
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 4
17.
COS 4a
The chart below shows the physical properties of 4 different elements. Based on the chart which element is most likely a nonmetal?
a)
1
b)
2
c)
3
d)
4
18.
COS 4
The image below shows 2 different elements - Copper and Gold - and their respective squares as shown on the Periodic Table
Which of the following is an accurate comparison of the atomic number and mass of Copper and Gold?
a)
Gold has a smaller atomic mass and fewer electrons than Copper
b)
Gold has the same atomic mass as Copper, but a greater atomic number
c)
Gold has the same atomic number as Copper, but a much greater atomic mass
d)
Gold has both a greater atomic number and a greater atomic mass than Copper
19.
COS 4a
Below shows a diagram of the Periodic Table with 5 different elements and their location.
Based on your knowledge of the Periodic Table and the arrangement of each element, which element would have similar properties to Iodine?
a)
Manganese (Mn)
b)
Tellerium (Te)
c)
Chlorine (Cl)
d)
Xenon (Xe)
20.
COS 1
The following key is for the 4 particle diagrams below .
Which is the only particle diagram that represents a mixture?
a)
A
b)
B
c)
C
d)
D
21.
Leroy combines magnesium (Mg) and fluorine (F).
Based on the periodic table, which statement describes the interaction of these two elements?
a)
Mg is a nonmetal and F is a metal that forms an ionic bond.
b)
Mg is a metal and F is a nonmetal that forms an ionic bond
c)
Mg is a metal and F is a metal that forms a covalent bond.
d)
Mg is a metalloid and F is a nonmetal that forms a covalent bond.
22.
COS 5
Four students are debating why Sodium (Na) and Potassium (K) are similar elements.
Sharon says they are similar because they have the same neutron mass.
James says it’s because they have a similar atomic mass.
Emma believes it’s because they have the same number of electron shells.
George argues it’s because they have the same number of valence electrons.
Identify the student who is correct.
a)
Sharon, because all elements have neutrons with the same mass.
b)
James, because elements with similar atomic masses are in the same group.
c)
Emma, because elements with the same number of shells are in the same group.
d)
George, because elements in the same group have the same number of valence electrons
23.
The image below shows water being heated up using a Bunsen burner. After an unknown amount of time the water begins to boil in the tube as shown in the image.
Why is boiling not evidence of a chemical change?
a)
Boiling is phase change that does not involve the creation of a new substance
b)
Boiling requires a temperature change which can only occur in physical changes
c)
Boiling does not involve the production of light which all chemical changes require
d)
Boiling does not increase the volume of liquid which all chemical changes require
24.
COS 5
During a lab exploring the Periodic Table, students are comparing the properties of gases in Group 18. Maya notices that Krypton (Kr) doesn’t react with any other elements and wonders which other element might have the same number of valence electrons.
Out of the four elements listed below, identify the one with the same amount of valence electrons as Krypton.
a)
Neon (Ne)
b)
Fluorine (F)
c)
Chlorine (Cl)
d)
Selenium (Se)
25.
Solutions of lead(II) nitrate and potassium dichromate are mixed. The solution turns cloudy and yellow. Solid yellow particles fall to the bottom of the beaker. Which statement best describes this reaction?
a)
This was a chemical reaction due to a precipitate forming
b)
This was a chemical reaction due to a gas forming
c)
This was not a chemical reaction because a new substance did not form
d)
This was not a chemical reaction because there was no temperature change in the substance
26.
COS 3 &COS 1
Students were given 4 substances and were told to identify the substances based on their physical properties. Their observations were recorded in the data table below.
Based on the observations of the students which sample could you identify as a solution?
a)
E
b)
F
c)
G
d)
H
27.
In the diagram below you can observe substance A and substance B reacting to form substance C.
Based on your knowledge of matter, what type of substance is C?
a)
Compound because A and B chemically bonded together
b)
Mixture because substance C show various elements physically combined
c)
Element because substance C is made up of only 1 type of atom
d)
A colloid because substance B did not chemically combine with substance A
28.
A student is trying to determine why a banana will rot faster when left on the counter versus the fridge. The student places 1 banana on the fridge and then 1 on the counter.
Exactly 7 days later the student observes the decomposition of each banana and finds the one on the counter has spoiled much faster.
They report their findings in the data table below.
Based on your knowledge of chemical reactions what could explain why the banana in the fridge was still edible on Day 7?
a)
Rotting is a chemical reaction that decreases due to the decrease of temperature in the fridge
b)
Rotting is a physical change that is not effected by increases or decreases in temperature
c)
Rotting is a chemical reaction that increases due to the increase of temperature in the fridge
d)
Temperature has little to no effect on the rate of a chemical reaction
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