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Worksheets3RD QUARTERLY TEST REVIEW SCIENCE 8
Total questions: 27
Worksheet time: 14mins
A glass of water is placed in a freezer overnight. How does the arrangement and motion of the water molecules change when it turns into ice?
Molecules move faster and spread apart
Molecules slow down and become more organized
Molecules remain in the same arrangement but move slower
Molecules disappear and reform when thawed
When sugar dissolves in water, it seems to disappear. What happens to the sugar molecules?
They break apart into atoms and form a new substance
They spread out evenly among the water molecules
They stop moving and settle at the bottom
They are destroyed by water molecules
A metal rod is heated over a flame. What happens to the motion of its atoms?
Atoms slow down and move closer together
Atoms stop moving
Atoms vibrate more and spread slightly apart
The metal rod disappears
Water evaporates from a puddle on a sunny day. How does this affect the movement of water molecules?
They move slower and come together
They gain energy, move faster, and spread into the air
They turn into smaller molecules
They stop moving completely
A student notices that a balloon shrinks when placed in a refrigerator. What happens to the gas particles inside the balloon?
They slow down and move closer together
They disappear and leave an empty space
They increase in energy and spread apart
They stop moving
A solid piece of dry ice turns into gas without melting into a liquid. What type of physical change is this?
Condensation
Freezing
Sublimation
Deposition
An atom has an atomic number of 15 and a mass number of 31. How many neutrons does it have?
15
16
31
46
An atom of chlorine has 17 protons. How many electrons does it have in a neutral state?
8
17
34
18
Which subatomic particle determines the identity of an element?
Proton
Neutron
Electron
Nucleus
A certain atom has 12 protons, 12 neutrons, and 12 electrons. What is its mass number?
12
24
36
48
An atom of sulfur has a mass number of 32 and an atomic number of 16. How many neutrons does it have?
16
32
48
8
If an atom has 7 protons and 8 neutrons, what is its atomic number?
7
8
15
14
An atom has an atomic number of 20. How many protons does it have?
10
20
40
30
Which of the following statements is true about electrons in an atom?
They are found in the nucleus
They have a positive charge
They determine the chemical behavior of the element
They have the same mass as protons
Which element is most likely to react violently with water?
Neon
Sodium
Iron
Carbon
Which element is a noble gas and is least likely to react with other elements?
Hydrogen
Helium
Nitrogen
Oxygen
Which element is most similar in properties to magnesium (Mg)?
Calcium (Ca)
Oxygen (O)
Fluorine (F)
Copper (Cu)
Why are alkali metals highly reactive?
They have a full outer shell
They easily lose one electron
They are very dense
They have no neutrons
Which group of elements tends to gain electrons in reactions?
Noble gases
Halogens
Alkali metals
Transition metals
What can be predicted about fluorine based on its position in the periodic table?
It is a metal
It is highly reactive
It has a full outer shell
It loses electrons easily
Which of these elements is a metalloid?
Carbon
Boron
Oxygen
Neon
What happens to atomic size as you move from left to right across the periodic table?
It increases
It decreases
It remains constant
It fluctuates randomly
Which of the following is true about elements in the same group?
They have similar chemical properties
They have the same atomic number
They have the same number of neutrons
They are arranged randomly
Why do elements in Group 18 rarely form compounds?
They are highly reactive
They have a full valence shell
They lack neutrons
They have the smallest atoms
Which quantum number determines the energy level of an electron?
Principal quantum number (n)
Azimuthal quantum number (l)
Magnetic quantum number (mₗ)
Spin quantum number (mₛ)
What does the azimuthal quantum number (l) represent?
The spin of an electron
The shape of an orbital
The energy level of an atom
The orientation of an orbital
Which of the following is NOT a valid value for the principal quantum number (n)?
1
0
3
5
