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science quiz
science quiz
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1
Which products below are classified as Colloids?
tea and honey
smoke
milk and smoke
milk
2
which factors below affect rate?
temperature
surface area
concentration
all the above
3
A graph that is endothermic shows a...
big change in the graph
small change in the graph
4
Where are protons located in an atom?
cell
cholorphyl
nucleus
mitochondria
5
which sentence below describes a Suspension?
substances can be easily separated and can be filtrated/settled
substances that don't mix
substances that can be filtrated or settled
substances that can be easily separated
6
Definition of solubility is....
the measure of how much solute will dissolve is a solvent
the amount of material that will separate out of a solvent
the measure of solvent that dissolves in a solute
7
What is the name of the formula
glucose
oxygen
helium
water
8
Identify the energy level of the products in an exothermic reactions
none of the above
the products have less energy because of energy being released
the products have more energy because energy is being released
the products have the same energy as the reactants
9
An Exothermic reaction...
releases energy in the form of light
releases energy in the atmosphere
releases energy in the form of heat
all of the above
10
Atomic mass subtracted by atomic number equals
number of protons
number of atoms
number of neutrons
number of electrons
11
what are chemical reactants?
neither
elements to the left of the arrow
substances that undergo chemical reactions
both answers are correct
12
How do you find the atomic mass of an atom?
subtract protons and electrons
subtract atomic number and neutrons
add protons and electrons
add the atomic number and neutrons
13
i
molecule
compound
14
Solutes are
neither
dissolved by the solvent
both
dissolving solvents
15
calculate the total number of atoms
8
4
16
12
16
What is a coefficient?
the letter
big number in front of a letter
subscript
17
the universal solvent is called?
gas
none of the above
dawn
water
18
calculate the total number of atoms
24
48
18
30
19
Which is the name for the following:
photosynthesis
helium
cellular respiration
sugar
20
Endothermic reactions...
stores energy in the chemical bonds of the reactants
none of the above
stores energy in the chemical bonds of the products
store energy in the atmostphere
21
What is an enzyme?
all of the above
proteins
they speed up chemical reactions by lowering the activation energy
catalysts
22
Calculate the number of neutrons: Atomic number is 3 and atomic mass is 12
9
8
15
17
23
What is a mixture?
a substance that cannot be separated
a substance of 1 element
a substance made of 2 of more elements
24
Which kind of cell has the most efficient rate of chemical reactions?
microscopic cells because of the decrease in surface area
large cells because of the decreased surface area
large cells because of the increased surface area
microscopic cells because of the increased surface area
25
Calculate the number of neutrons: Atomic number is 5 and atomic mass is 12
60
72
7
8
26
What is a chemical reaction?
a substance that is decomposed and breaks into individuals
neither
a combination of 2 or more elements combined to make a new substance
both answers
27
How do you identify a chemical reaction has take place?
light or heat has been released
color changes occured
all of the above
gas has been released
28
What does a chemical formula describe?
elements, coefficients, and electrons
types of protons and the same of each
elements, coefficients, and subscripts
types of neutrons and the number of each
29
How do Isotopes differ from the original atom?
has increased number of neutrons and mass
has the same number of electrons and neutrons
has the same number of neutrons and different number of protons
30
definition for product is...
elements before a chemical reaction
a substance dissolved by a solvent
reactants forming a new substance after a chemical reaction
31
what is another name for the atomic number?
protons
chemistry
neutrons
electrons
