WorksheetsMid Term Exam
Total questions: 50
Worksheet time: 50mins
What are the two branches of sciences that make up Physical Science?
Chemistry and Physics
Physics and Psychology
Chemistry and Geometry
Geology and Chemistry
A Hypothesis is
An animal
An educated guess
The result and conclusion
The observation
A constant in an experiment
Always changes
Always vary
Always show the results
Always stay the same
What is the final step in the Scientific Method?
Problem
Hypothesis
Conclusion
Scientific Method
If there was an accident in the lab, what is the first thing that you should do?
Run away
Run out the door
Tell a classmate
Tell the teacher
What is an inference?
A guess of judgement based off prior knowledge
Description using 5 senses
A collection of data
Something that you test in an experiment
The Independent Variable is defined as
The variable that results
The variable that changes
The variable that stays the same
The variable that does nothing
What is accuracy?
How many times a value is repeated
How close a value is to being correct
How many significant figures are in this number 0.09840
1
3
5
4
Precision is
How many times a value is repeated
How close a value is to being correct
What is Matter ?
Anything that has mass and takes up space
The amount of space that an object takes up
Energy cannot be created or destroyed
What is a Homogeneous Mixture?
A mixture that consist of visibly different substances
A mixture that has the same uniform appearance throughout
Something that calculates the density of a substance
Characteristic of the substance
The Kinetic Theory of Matter states that
Energy cannot be created nor destroyed
The amount of space that an object takes up
All matter consist of many very small particles that is constantly moving
Describes the behavior of matter when it interact with other matter
Solutions are Homogeneous
True
False
All matter moves
True
False
Is K an Element or a Compound?
Element
Compound
If a Mixture is Heterogeneous it means
The mixture have the same uniform appearance throughout
The mixture consist of visibly different substances
Example for physical property
odor
burns in air
reacts with water to create hydrogen gas
rust
A change where one or more new substances are created.
Physical Change
Chemical Change
Rust on an iron bar is an example of chemical change.
True
False
Flammability is an example of what property?
Chemical property
Physical property
Physical properties are
properties that can be observed without changing the identity of the substance
properties that describe how a substance changes into a completely different substance
Water (H2O) is an example of
Element
Compound
Homogeneous Mixture
Heterogeneous Mixture
Calcium Ca is an
Element
Compound
Mixture
Which particles are found in the nucleus of an atom?
electrons, only
neutrons, only
protons and electrons
protons and neutrons
Is salt (NaCI) a compound or a element
Compound
element
What is CO2 and example of?
Element
Compound
Which atom has a nucleus that contains 13 protons and 14 neutrons?
Mg
Be
Al
N
Which of the following lists only elements?
H2O + OH, MgCl2
H2O, KF, Ne
KCl, Ag, Au
K, Cl, N
Jay combines water, sugar, and lemon juice to form lemonade. What type of substance was made?
Element
Molecule
Mixture
Compound
Which of the following is an example of a heterogenous mixture?
soap
a salad with lettuce, olives, and tomatoes
cup of coffee
water
The three subatomic particles are
proton, neutron, electron
proton, nucleus, electron
protein, neutron, electricity
proton, neutral, electives
99.9% of the atom's mass is found where?
nucleus
protons
electron cloud
neutrons
When an atom contains more electrons than protons, it is
a neutral atom with no charge
an ion and negatively charged
an ion and positively charged
an isotope and has more mass
When an atom contains more neutrons than another atom with the same number of protons, it is
a neutral atom with no charge
an ion and negatively charged
an ion and positively charged
an isotope and has more mass
The nucleus is ____________ charged.
positively
negatively
neutral
The area around the nucleus of an atom where the atom's electrons are most likely to be found is called
electron cloud
quark
electron
nucleus
If a carbon atom has six protons and has a mass of 13 amu, how many neutrons are in that carbon atom?
5
6
7
8
If a neutral atom has 8 protons, how many electrons does it have?
7
8
9
10
Atoms of the same element with different numbers of neutrons are called
metalloids
transition elements
radioactive
isotopes
A certain atom has 26 protons, 26 electrons, and 30 neutrons. What is its mass number?
26
30
52
56
Neutrons are
negative
positive
neutral
Which correctly pairs the OUTSIDE particles with their charge?
electrons: positive
protons: positive
neutrons: neutral
electrons: negative
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?
30
56
26
82
Oxygen's atomic number is 8. This means that an oxygen atom has
eight protons in the nucleus
a total of eight protons and neutrons
eight neutrons in its nucleus
a total of eight neutrons and electrons
An atom consists of 8 protons and 6 neutrons. What is the total number of electrons present in this neutral atom?
6
8
2
12
An aluminum atom has 13 protons, 13 electrons, and 14 neutrons. What is its mass number?
13
26
27
40
What is found between the electrons and the nucleus?
air
empty space
other atoms
other forms of matter
Who first proposed an atomic theory based on scientific knowledge?
Ernest Rutherford
John Dalton
JJ Thomson
Dmitri Mendeleev
If an atom contains one proton, one neutron and one electron, what is that atom’s mass?
1 amu
2 amu
3 amu
0 amu
