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2023 Review
2023 Review
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1
How many oxygen atoms are in this compound formula? Li
2
O
3
4
1
2
2
What is the "scientific method"?
A set series of steps used by scientists only
A series of steps with a set order of use
none of these
An organized way of questioning, seeing, and answering.
3
When an acid and a base are mixed what is produced?
more base + water
water + a salt
more acid + water
an explosion
4
Which of the following statements correctly describes the relative density of the objects?
the quarter and pebble are denser than the water
the quarter and pebble are equally dense to the cork and ball
the quarter and pebble are less dense than water
the quarter and pebble are less dense than the cork and ball
5
What do you need in order to begin the scientific method?
A problem/question
Tools
Hands
A degree
6
Does pipe material affect the temperature of flowing water? What is the dependent variable?
Water temperature
Pipe material
Diameter of the pipe
7
The sum of the number of protons and neutrons inside the nucleus is called the __________.
element number
atomic number
nucleus number
mass number
8
The physical change from a liquid to a gas is called _____________________
condesation
melting
precipitation
evaporation
9
Where are the non-metals found on the periodic table?
Bottom
Left hand side
Top
Right hand side
10
Law of conservation of mass
matter is not created nor destroyed
what comes up - must come down
all things need water to live
we are all equal
11
How many individual oxygen atoms are in one molecule of Fe
2
O
3
(H
2
O)?
7
1
4
3
12
How many lithium atoms are in this compound formula? Li
2
O
4
1
2
3
13
What is a hypothesis?
The results you get from the experiment
What you predict will happen in the experiment
What you learn in an experiment
The equipment you use in the experiment
14
A Scientific MODEL
is a workable explanation of what is happening
always gives the right answer
has to be a physically constructed item
something a scientist does in his spare time
15
What do all scientific models have?
Moving parts
Mathematical equations
Arrows
Limitations
16
If I floss more, then I will have fewer cavities. What is the independent variable?
Amount of flossing
Number of cavities
Type of floss
17
The pH scale goes from 0-14 with ___ being neutral.
7
0
6.5
14
18
Which process is an example of a physical change?
A peanut butter and jelly sandwich being digested
Sodium metal and chlorine gas combined to form table salt
Cutting carrots into pieces and mixed in a salad
Sodium metal and water combining to for a compound and gas
19
According to the graph, how many more hours did Jason work than Jack?
5 more hours
9 more hours
8 more hours
6 more hours
20
What range on the pH scale is a base?
0-14
0-6
7
8-14
21
Choose the physical change
tomatoes molding
nail rusting
frying an egg
stretching a rubber band
22
Thermal conductivity describes an object's _________?
if it can be hammered into sheets
how electricity affects it
ability to transfer heat
temperature
23
A mixture of 2 or more metals is called a/an:
Alloy
Mixed metal
Heavy Metal
Combination metal
24
(True or False): A hypothesis is made before an observation has taken place.
True
False
25
What is a Scientific Law?
An explanation for a detailed phenomenon with complex parts
An explanation that never changes
A testable explanation for how something works
A specific, usually mathematical, explanation for phenomenon
26
How many protons are in Gallium (Ga)?
73
32
31
72
27
The periodic table is arranged _______________.
by increasing atomic mass
alphabetically
by increasing atomic #
28
An object's mass is 12g and its volume is 4mL. What is the density?
6g/mL
3g/mL
16g/mL
4g/mL
29
If water was heated by a hot plate to model the water cycle, the hot plate represents
the sun
the wind
the moon
30
replication? repetition?
Add weight to the measurement of each object that fell off the scale.
Use a different spring scale to measure each of the objects.
Conduct repeated trials when measuring each of the objects.
Ask each member of the lab group to take a turn measuring the objects.
31
What is the density of water?
1.2 g/cm3
0.5 g/cm3
1 g cm3
2 g/cm3
32
What type of graph is this?
bar graph
line plot
pie chart
pictograph
33
Select the correctly written hypothesis
Dogs are friendly
What happens if you train dogs?
If you treat dogs well they will be friendly.
If you train dogs more they might be better.
34
According to the graph, how many hours did Erica work?
29 hours
27 hours
26 hours
28 hours
35
What are the three particles that are found inside an atom? Protons, neutrons and...
Electrons
Graviton
Gravity
Magnetrons
36
A
scientific theory
is _____?
The same as a fact
An untested idea
A rule describing a pattern in nature
Accepted as fact until proven wrong
37
The number of atoms that you begin with in a chemical reaction...
must be the same as the number you finish with
changes depending on how much energy is formed.
can be different to the number you finish with
must be an even number
38
Atoms of the same element that have a different number of neutrons are called ____________.
indicators
isotopes
isomers
ions
39
Law of conservation of mass states
matter is neither created or destroyed
matter is destroyed
Matter is created
matter is not created
40
The variable that is measured in an experiment is known as which of the following?
Dependent variable
Controlled variable
Independent variable
Experimental variable
41
What are two characteristics that are good for identifying a substance?
Mass and volume
Melting point and boiling point
Volume and hardness
Mass and hardness
42
The process of testing a hypothesis under controlled conditions is called a(n) _____.
Data/Results
Observation
Experiment
Conclusion
43
All of the following are examples of containers filled with mixtures
except
?
A cup of fruit salad
A jar filled with trail mix
A glass filled with water
A bowl of cereal and milk
44
A
scientific law
is ______?
Laws scientist need to follow to perform science correctly.
A rule that describes a pattern in nature.
The steps scientists follow to investigate our natural world
An explanation of observations gained through observations
45
Which group is the most reactive group on the periodic table?
noble gases
alkali metals
alkaline earth metals
46
A scientific model:
makes something more complicated
simplifies a complicated concept
is a hands on tool
is a picture
47
Which is NOT useful in identifying substances?
weight
solubility
density
melting point
48
When you heat a metal solid, the motion of its atoms will increase making them
spin around in a circle
get older
come together
spread apart slightly
49
Choose the chemical change
wood rotting
crushing a can
glass breaking
melting gold for jewelry
50
Sign of chemical change:
change in size
change in color
change in shape
Melting
51
Which of the following is a hypothesis?
If a paper towel has more texture, it will absorb more water
Red candy tastes better than blue candy.
Soccer is the best sport.
If a cat runs up a tree, it will be stuck.
52
Which group is the least reactive group on the periodic table?
alkaline earth metals
alkali metals
noble gases
53
Sign of chemical change
all of the above
production of odor
formation of precipitate
change of state
54
The number of protons an atomc contains is identified by the ____ ____ on the periodic table.
atomic #
group #
mass #
row #
55
Protons have what charge?
Positive
Neutral
Negative
56
Why are scientific models important?
They never change.
They help visualize things that are complex, tiny or big.
They prove scientific theories.
They make it harded to understand things.
57
During a chemical reaction, the atoms rearrange themselves to form new...
Molecules
Nuclei
Energy
Elements
58
Which process represents a chemical change?
Sand, water, and salt combine to form a mixture
A lake freezes over into ice
A metal bar is rolled into a flat sheet
Vinegar bubbles when baking soda is added
59
Which step of the scientific method do you determine if your hypothesis was right or wrong?
Replicate experiment
Conclusion
Observation
Experiment
60
How many oxygen atoms are there in a water molecule?
3
2
1
4
61
How do you find density?
mass over volume
volume over density
volume over mass
density over mass
62
In which type of matter will molecules and atoms will spread out to fill any container?
gas
solid
liquid
63
When acid reacts with a base its called .....?
Neutralization
Decomposition
Oxidation
Reduction
64
To be useful in science, a hypothesis must:
Be observable
Be testable
Be measureable
Be correct
65
What are the states of matter?
Solids, liquids, and gases.
Facts or information.
Anything that has gravity.
66
What are the products of an acid base reaction?
Hydroxides and oxides
Salt and water
Hydrogen and oxygen
Ham and cheese
67
The variable that is kept the same through the experiment is called a(n) _____.
Independent Variable
Dependent Variable
Hypothesis
Controlled Variable
68
A scientist using scientific methods would NOT
record data.
form an opinion.
perform repeated trials.
ask a question.
69
Protons are found in the
orbit
electron cloud
cloud
nucleus
70
A sign of chemical change
new substance forming
melting
boiling
Change of state
71
What range on the pH scale is an acid?
0-14
0-6
7
8-14
72
Which of these is
NOT
a type of scientific model?
physical model
mathematical model
fashion model
conceptual model
73
The last step in the scientific method is ________________.
Make an Observation
Communicate and Repeat Experiment
Experiment
Analyze Data
