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Worksheets2016 7th grade Science Midterm Review
Total questions: 31
Worksheet time: 16mins
Name
Class
Date
1.
Lenny accidentally drops his matchbox car into a graduated cylinder. If the car has a mass of 10 grams and the water level in the cylinder rises from 41 ml to 46 ml. Determine the density of the matchbox car. The formula for density is D = m/v.
a)
0.5 g/ml
b)
2 g/ml
c)
15 g/ml
d)
50 g/ml
2.
Which safety rule is MOST important when smelling the product of a chemical reaction?
a)
Hold with tongs.
b)
Use a wafting motion
c)
Wear closed-toed shoes.
d)
Keep nose directly above open container.
3.
Which is true of ionic compounds?
a)
They are good conductors as solids.
b)
They are made by sharing electrons.
c)
They are made of metals and nonmetals.
d)
They are electrically neutral when dissolved in a solution.
4.
Which is true of all covalent compounds?
a)
They share electrons in bonds.
b)
They are electrically charged.
c)
They are good conductors in water .
d)
They are usually made of a metal and a nonmetal.
5.
The periodic table is organized by
a)atomic mass .
b)atomic size
c)atomic number
d)atomic periodicity.
6.
What is the smallest unit that can carry on all functions of life?
a)
cells
b)
elements
c)molecules
d)organelles
7.
When two or more substances combine, but each keeps its own properties, the new combination is called a(an)
a)
Element
b)
mixture
c)
compound
d)
Homogeneous substance
8.
The atomic number of magnesium is 12. This means that its nucleus must contain
a)
6 protons and 6 neutrons.
b)
6 neutrons and 6 electrons.
c)
12 neutrons and no protons.
d)
12 protons and no electrons.
9.
According to the scale, which of these substances is the strongest acid?
a)
NaOH
b)
blood
c)
bleach
d)lemon juice
10.
Which sub-atomic particle is positively charged and found in the nucleus?
a)
proton
b)neutron
c)
electron
d)beta particle
11.
Describe the location of non-metals on the periodic table?
a)middle
b)upper left corner
c)lower left corner
d)upper right corner
12.
A student studies the gathering of frogs at the end of a pond. She has collected data, formed graphs, and now should do what with that information?
a)experiment
b)author a procedure
c)publish her findings
d)analyze and conclude
13.
While getting a beaker from the shelf, Robert dropped the beaker and it broke. What should Robert do FIRST?
a)
Inform his teacher.
b)
Get a broom and sweep up the beaker.
c)
Put on gloves and carry the glass to the trash can.
d)
Carefully place the glass shards inside a separate beaker.
14.
Which measures the mass of an object?
a)a spring scale (in N)
b)a height scale (in feet)
c)a graduated cylinder (in mL )
d)a triple beam balance (in grams)
15.
Which subatomic particle is NOT found at the center of the atom?
a)
electron
b)
neutron
c)photon
d)
proton
16.
What is the identity of the atom shown?
a)fluorine
b)neon
c)
nitrogen
d)
potassium
17.
Which two structures are found ONLY in plant cells?
a)vacuoles and ribosomes
b)chloroplasts and ribosomes
c)cell walls and chloroplasts
d)endoplasmic reticulum and cell walls
18.
When heating a test tube or flask,
a)
it should remain capped.
b)it should remain in a test tube rack.
c)safety goggles should be worn for the duration of the experiment.
d)
an experimenter can briefly look directly into the tube to make observations.
19.
If there are 4 grams of reactant, how many grams of product are produced by the chemical reaction?
a)
0 grams
b)
2 grams
c)
4 grams
d)
8 grams
20.
Which statement could ONLY be accurately placed within the base circle?
a)is common in fruit juices
b)can be found in the stomach
c)can dissolve a copper penny
d)includes many cleaners, like bleach
21.
According to the cell theory, where do cells come from?
a)cells can only come from other, pre-existing cells
b)cells are formed from the semi-conservative replication of DNA
c)cells can only arise from the complex chemical environment found in organic solutions
d)cells come from other cells and, on rare occasions, from the spontaneous action of inorganic enzymes
22.
Brad and Juan conducted several tests to determine the properties of silver metal. They noted that is was white, and conducted both electricity and heat. They computed the density to be 10.49 g/cm3. Silver did not react with water but in nitric acid, gas was released.
What evidence supports a chemical change in the silver?
What evidence supports a chemical change in the silver?
a)
Silver conducts electricity.
b)
Silver reacts with nitric acid to produce a gas.
c)
The color of silver at room temperature is white.
d)
Silver conducted heat and as the temperature increased, became more malleable.
23.
One difference between mixtures and pure substances is that
a)mixtures can be physically separated.
b)mixtures are made of one type of atom.
c)pure substances have no chemical bonds.
d)pure substances can be physically separated.
24.
To determine the density of an empty plastic jug, you would measure
a)it on a scale.
b)
it with a ruler.
c)the mass and volume.
d)the length and volume.
25.
Rusting metal is an example of a _________ change.
a)phase
b)state
c)chemical
d)physical
26.
All the elements of a family in the periodic table have what feature in common?
a)
They all have similar chemical properties.
b)
They all have the same number of protons in the nucleus.
c)
They are all located in the same horizontal row or period.
d)
They all have the same number of electrons in the electron cloud.
27.
Which property is an example of a chemical property?
a)the ability to burn
b)the ability to melt
c)the ability to dissolve
d)the ability to evaporate
28.
In the classification of matter chart, letter A. would be a( n)
a)
acid
b)
compound
c)
element
d)solution
29.
Which organelle is the powerhouse of the cell, the site of cellular respiration?
a)
2 - nucleus
b)
5 - endoplasmic reticulum
c)
6 - Golgi bodies
d)
9 - mitochondria
30.
Your science teacher has asked the class to make a cell city model. Which building or business in the city could represent the mitochondria, and why?
a)city dump - waste storage
b)city hall - control center
c)roads - transportation system
d)power company - produces energy
31.
The table shows the volumes of different samples of liquid. Which sample has the greatest DENSITY?
a)
Sample A
b)
Sample B
c)
Sample C
d)
Sample D
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