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Worksheets2nd Qtr Science Test - 8th grade
Total questions: 59
Worksheet time: 58mins
Which one is NOT an indicator of a chemical change?
formation of gas
change in temperature
formation of liquid
unexpected change of color
A physical change occurs during digestion when
shape or size is altered.
bubbles are released from a substance.
a new substance is created
a color change occurs.
What is considered a chemical change during digestion?
Moving food through the esophagus by peristalsis.
Churning food in the stomach.
Absorption of water in the large intestines.
Enzymes in the mouth and stomach breaking down fats, proteins, and carbohydrates.
How many iron atoms are in
Fe(NO3)2
1
2
3
6
Which of the following accurately describes the chemical formula of the molecule shown above?
3CH8O
C3H7O
C4H8O2
C3H8O
Which elements are in the formula shown above?
Tin and Chlorine
Tin, Carbon and Lithium
Sulfur, Nitrogen and Chlorine
Sulfur, Nitrogen, Carbon and Lithium
How many elements are in this chemical formula? NaHCO3
1
2
3
4
The greater the mass, the ______force it takes to move it.
less
more
What is represented by this graph?
constant speed
not moving
speed increasing
speed increasing at a constant rate
what is the motion described in the graph
all of above
constant speed
acceleration
constant position
What is happening at E?
Stationary
Accelerating
Constant speed; moving away from the starting position
Constant speed; returning to start position
What is this graph showing?
At rest
Acceleration
Constant speed of 1 m/s
Gradually speeding up
What is this graph showing?
Fast constant speed
Slow constant speed
At rest
Accelerating
If a boat travels at 22 km/hr for 10 hrs, what distance will it travel?
220 miles
2.2 km
220 km
22 km
Is this equation balanced?
Yes
No
Is this equation balanced?
Yes
No
What does the Law of Conservation of Mass state?
Matter cannot be gained or lost in a chemical reaction.
Matter can only be lost in a chemical reaction.
Matter can only be gained in a chemical reaction.
Matter can be gained and lost in a chemical reaction.
Which best represents a balanced equation?
120 grams of carbon plus 20 grams of oxygen → 200 grams of carbon dioxide
120 grams of carbon plus 50 grams of oxygen → 200 grams of carbon dioxide
120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide
Which statement is NOT a description of a chemical reaction?
A solid is dropped into a beaker of liquid and a gas is released.
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
A solid is dropped into a beaker of liquid and an explosion occurs.
A liquid is heated in the sun and half of it evaporates.
If a 10 kg object accelerates suddenly at 15 m/s2, how much force was applied to the object?
150 Newtons
15 Newtons
150 kilograms
100 kilograms
The number and type of atoms is the same before and after
a chemical reaction
both a chemical reaction and physical change
a physical change
Four students performed four different investigations by combining different substances. Their results are shown in the table below. In which experiment did a chemical reaction take place?
Experiment 1
Experiment 2
Experiment 3
Experiment 4
You know that a chemical reaction has occurred if
there is a precipitate (new solid)
there is a color change.
there is a temperature change.
All of these answers are evidence.
Carries oxygen and nutrients to all parts of the body.
Integumentary System
Nervous System
Circulatory System
Respiratory System
What is the main function of the endocrine system?
It creates chemicals, or hormones, that are sent around the body to maintain homeostasis.
It creates electrical messages that are sent around the body to maintain homeostasis.
It maintains the correct level of oxygen in the body to maintain homeostasis.
It releases waste from the body to maintain homeostasis.
What is the main function of the respiratory system?
to provide oxygen and remove carbon dioxide from the body
o break down food and absorb nutrients
to remove oxygen from the body and deliver carbon dioxide
When the hare population increased, what happened to the lynx population?
It increased.
It decreased.
It stayed the same.
If the grasshopper were to be removed completely from the food web, what organism would be most affected?
The squirrel
The shrew
The deer
The rabbit
Which of the following is a biotic factor in an ocean ecosystem?
the salt content of the water
the temperature of the water
the fish in the water
the oxygen in the water
Lizards and cacti are biotic factors in a desert ecosystem that would rely on which abiotic factors?
insects and sun
water and insects
snakes and temperature
water and soil
A certain plant needs moisture, carbon dioxide, oxygen,light, and minerals to survive. This scenario shows that this particular living organism depends on .
Biotic and Abiotc Factors
Biotic Factors
Abiotic Factors
None of the Above
If a disease destroying barley plants swept through an ecosystem, what would happen to the bird population that eat barley plants?
The bird population would stay the same
The bird population would infinitely increase
The bird population would decrease
What are the abiotic factors in this image?
water, sunlight, dirt, air
birds, trees, and sunlight
water, trees, and birds
What are valence electrons?
Any of an atom's electrons
Electrons located on the first energy level
Electrons not attached to any atom
electrons located on the outer energy level
The atoms on the right of the staircase are called
metalloids
non-metals
metals
noble gases
Which group on the periodic table is the most reactive?
Group 1
Group 2
Group 13
Group 18
What are the vertical columns on the periodic called?
groups
periods
Which elements have properties in common?
elements in a group
elements in a period
Name the group that contains nonreactive elements.
noble gases
halogens
alkali metals
alkaline earth metals
Which element is this?
Nickel
Neon
Sodium
Nitrogen
Name this element.
Neon
Magnesium
Sodium
Manganese
What is the atomic number of this atom?
2
4
6
8
How much force is needed to accelerate a 3kg skateboard at 5m/s2.
8N
1.6N
0.6N
15N
What is the energy transformation that occurs in an electric pencil sharpener?
mechanical energy to electrical energy
electrical energy to mechanical energy
radiant energy to sound energy
chemical energy to mechanical energy
If you increase the mass on an object, its acceleration
decreases
stays the same
also increases
stops
Match the description to the graph:
"The car is stopped."
