WorksheetsGrade 7 Unit 1 Common Assessment
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
What happens to water molecules when a large quantity of thermal energy is added to water in a liquid state?
a)
The more energy added, the greater the attraction between the molecules.
b)
The molecules gain energy, move farther apart, and become a gas.
c)
The water molecules become packed closer together, and their temperature increases.
d)
Each water molecule gives up energy and eventually stop moving.
2.
Students were asked to draw a concept map of changes in matter at the molecular level. Based on the diagram, which of the following statements is true?
a)
Arrow A= particles become more tightly packed.
b)
Arrow B= the pressure of the substance decreases.
c)
Arrow C= energy of particles increases.
d)
Arrow D= particles become more widely spaced.
3.
Which of the following is true about how hydrogen and oxygen can combine to form molecules.
a)
Hydrogen and oxygen can combine in many ways to form different molecules.
b)
Two atoms of hydrogen are always required to bond with two atoms of oxygen.
c)
When oxygen combines with hydrogen to make a molecule, water will always be produced.
d)
Molecules composed of hydrogen and oxygen must have at least four atoms.
4.
Which of the following best explains the relationship between molecules and atoms?
a)
Atoms are molecules that have a charge.
b)
Atoms have smaller parts, called molecules.
c)
Molecules are made up of two or more atoms.
d)
Molecules are atoms that have no mass.
5.
Organisms are mostly made up of all of the following elements except
a)
carbon
b)
aluminum
c)
oxygen
d)
nitrogen
6.
Elements that are normally in a gas form, that are dull, brittle, and poor conductors
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Solids
7.
Usually solid elements that are good conductors, malleable, ductile, and shiny
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Semiconductors
8.
Semi-conductors have properties of both metals and nonmetals. An example of a semi-conductor is
a)
Carbon
b)
Oxygen
c)
Magnesium
d)
Silicon
9.
What is true of the particles of a substance that is heated or cooled?
a)
The particles size changes
b)
The particles motion changes
c)
The particles size and motion changes
d)
Neither the size nor the motion of the particles change
10.
What are the nonliving parts of an environment called?
a)
Biotic
b)
Organism
c)
Abiotic
d)
Population
11.
Table sugar and table salt are examples of
a)
atoms.
b)
elements.
c)
mixtures.
d)
compounds.
12.
Substances that cannot be broken down chemically into other substances are
a)
elements.
b)
compounds.
c)
mixtures.
d)
solutions.
13.
Students are asked to create models of molecules using marbles of different colors to represent atoms of different types. Below is a table describing the models made by four students.
a)
Only students 1,2, and 4 created acceptable models, since molecules must be made of different types of atoms.
b)
All of the students created acceptable models because molecules can consist of many different configurations of atoms.
c)
Only student 2 created an acceptable model of a molecule, since every molecule must have a balance of atoms.
d)
All student models are acceptable except that of student 4, since molecules can't be made of so high a number of atoms.
14.
How do liquid water, ice, and water vapor differ from each other?
a)
They are made of different kinds of atoms.
b)
They are made of different kinds of molecules.
c)
They are different compounds.
d)
They are different states of matter.
15.
Anything that has mass and takes up space can be called
a)
matter.
b)
volume.
c)
an atom.
d)
a molecule.
16.
From an element's location in the periodic table, you can predict
a)
its' chemical name.
b)
its' properties.
c)
its' chemical symbol.
d)
color
17.
The smallest particle of an element is called a(n)
a)
compound.
b)
mixture.
c)
atom.
d)
molecule.
18.
What can you tell about methane (CH₄) from its chemical formula?
a)
It contains four carbon atoms.
b)
It contains four hydrogen atoms.
c)
it contains zero carbon atoms.
d)
it contains five carbon atoms.
e)
19.
a)
symbol.
b)
formula.
c)
subscript.
d)
reaction.
20.
The number placed below an element's symbol in a chemical formula is called a
a)
subscript.
b)
coefficient.
c)
reactant.
d)
product.
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