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Worksheets8th Grade Unit 1
Total questions: 28
Worksheet time: 23mins
Which of the following are elements?
He
O2
S8
Fe2O3
O3
Which of the following is a compound?
(circles of different colors represent different types of atoms)
(circles that are touching are chemically bonded)
Which of the following is a mixture?
(circles of different colors represent different types of atoms)
(circles that are touching are chemically bonded)
A compound is made of ________ atoms.
big
similar
different
A substance that contains only one type of atom is a(n)
compound
element
heterogeneous mixture
homogeneous mixture
What is the definition of a compound?
The smallest part of any substance which can exist on its own
Two or more atoms chemically joined together (can be the same or can be different)
A simple substance in which all the atoms are identical
Two or more different elements chemically joined together
Is salt (NaCI) a compound or an element?
Compound
element
Element, Compound or Mixture?
Silver (Ag)
Element
Compound
Mixture
Which elements are present in the compound for Aspirin?
Check all that apply.
Cobalt
Helium
Hydrogen
Carbon
Oxygen
How many different elements make-up the compound shown?
2
3
6
7
A process powered by adhesion that causes water molecules to move upward through a narrow tube such as the stem of a plant is called...
polar molecule
surface tension
capillary action
specific heat
An attraction between molecules of different substances is called...
adhesion
cohesion
A measure of how difficult it is to stretch or break the surface of a liquid is called...
specific heat
polar molecule
capillary action
surface tension
An attraction between molecules of the same substance is called...
adhesion
cohesion
Water molecules ________ since the slightly positive portion of a water molecule is attracted to the slightly negative portion of the next water molecule.
stick together
spread out
If a car travels 150 meters in 10 seconds, what is its average speed?
10 m/s
15 m/s
20 m/s
25 m/s
How does Newton's Third Law of Motion apply to a rocket launch?
The rocket's engines push down on the ground, and the ground pushes the rocket upwards.
The rocket's mass decreases as fuel is burned, increasing acceleration.
The rocket's speed is constant due to balanced forces.
The rocket's acceleration is independent of its mass.
If a force of 50 N is applied to a 5 kg object, what is the acceleration of the object?
5 m/s²
10 m/s²
15 m/s²
20 m/s²
