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Advanced Unit 3 (Changes in Energy) Flashcards | StudBud
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Advanced Unit 3 (Changes in Energy)
Advanced Unit 3 (Changes in Energy)
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StudBud Administration
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Periodic table and chemical equations review.
Flashcards
24 cards
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Practice quiz
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Questions
24
Answers
1
According to a pH scale, which pH would be the strongest acid?
9
3
6
12
2
Which observations are physical properties?
Observations 1 and 2 only
Observations 1, 3, and 4 only
Observations 2 and 4 only
Observations 2, 3, and 4 only
3
The formation of a gas...
occurs when the water boils.
is a physical property.
occurs when adding water to acid.
is a sign of a chemical change.
4
Which of these conditions is responsible for Earth having an environment that supports life?
erupting volcanoes moderating atmospheric temperatures
oceans regulating climate on land
water that exists in all three physical states of matter
the percentage of nitrogen in the atmosphere
5
The compound potassium sulfate, K
2
SO
4
, is composed of...
1 molecule of potassium and 2molecules of sulfate.
2 molecules of potassium and 1 molecule of sulfate.
2 atoms of potassium, 1 of sulfur, and 4 of oxygen.
2 atoms of potassium, 4 of sulfur, and 4 of oxygen.
6
Which of the following states the law of conservation of mass?
Mass cannot be created or destroyed in a chemical reaction.
Atoms are rearranged in a chemical reaction.
Two compounds combine to form a new compound.
Energy is neither created nor destroyed in a reaction.
7
What is the purpose of a control in an experiment?
It is an additional trial that is done in the beginning.
It helps determine the starting point and temperature.
It is used to provide a consistent increase in the variables
It provides a reference value for comparison to samples.
8
Which of the following observations provides evidence of a physical change?
a cake that was baked from many ingredients
using light to produce sugar in plants
a bottle that was broken into many small pieces
using heat to burn a log in a fireplace
9
Which process best describes when the nucleus of an atom is split and releases energy?
nuclear fusion
geothermal reaction
nuclear fission
hydroelectric reaction
10
When oxygen combines with hydrogen, which substance is formed?
hydrogen dioxide
vinegar
hydrochloric acid
water
11
The formation of an ionic bond involves the...
transfer of electrons.
sharing of neutrons.
transfer of neutrons.
sharing of protons.
12
Which of the following shows an exothermic reaction?
2H2 + O2 --> 2H2O
2H2O + energy --> 2H2 + O2
2Na + Cl2--> 2NaCl + energy
6CO2 + 6H2O + energy --> C6H12O6 + 6O2
13
When magnesium sulfide MgS is separated into magnesium and sulfur, the particles are called...
isotopes.
molecules.
ions.
compounds.
14
What is the best way for a student to learn more about chemical properties of a substance?
shake the container vigorously
look up the name in a science book
test a small amount to see if it feels slippery
smell a very small amount of it
15
Which equation shows that the total mass during a chemical reaction stays the same?
3
4
2
1
16
Which of these properties can be found using a beaker, a hot plate, and a temperature probe?
Chemical composition
Oxygen level
Boiling Point
Density
17
The formation of covalent bonds involves the...
ionic bonds
sharing of electrons
fission of nuclei
transfer of electrons
18
Why is water known as the "universal solvent"?
It dissolves substances faster than all other solvents.
It dissolves all known substances.
It dissolves the greatest number of substances.
It dissolves only solid substances.
19
Which is the best conclusion based on the table?
The more acidic the substance, the faster it reacts.
The less acidic the substance, the faster the wool bubbles.
The less acidic substances change color faster.
The more acidic the substance, the faster the wool changes.
20
Which statement best describes the changes that occur when burning coal and boiling water?
Burning coal is chemical, and boiling water is physical.
Burning coal and boiling water are both physical changes.
Burning coal and boiling water are both chemical changes
Burning coal is physical and boiling water is chemical.
21
When an acid and a base neutralize each other, what remains?
a lipid and a protein
a weak acid and base
water and a salt
a strong acid and base
22
Mg + S -> MgS This equation expresses which change?
Two elements combine to form a different element.
Two atoms combine to form one molecule.
Two elements combine to form two new elements.
Two atoms combine to form one atom.
23
Which substance would
most
neutralize an acidic food?
baking soda (pH 8-9)
water (pH 6-7)
citrus fruit (pH 2-3)
dairy (pH 5-7)
24
Which of these represents the freezing point of water in correct SI units?
0o F
-273o C
32o F
0o C
