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Mixtures vs. Pure Substances 10-18-18 Flashcards | StudBud
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Mixtures vs. Pure Substances 10-18-18
Mixtures vs. Pure Substances 10-18-18
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A review of the differences between pure substances and mixtures, physical and chemical changes
Flashcards
30 cards
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Practice quiz
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Questions
30
Answers
1
Two or more types of atoms chemically bound together is a __________________.
compound
heterogeneous mixture
homogeneous mixture
element
2
NaCl (table salt) is categorized as which of the following:
homogeneous mixture-it's chemically combined
compound-it's chemically combined
element-it's not chemically combined
heterogeneous mixture-it's chemically combined
3
Which of the following is an example of a homogeneous mixture?
salad
beach sand
black coffee
rocky road ice cream
4
Which of the following can be used to identify a physical property of an element?
does a magnet attract the element?
does the element burn?
does the element bubble when exposed to acid?
does rust form when element is exposed to oxygen?
5
Which of the following best describes the image shown?
mixture of compounds
mixture of elements
element
compound
6
The study of matter and the changes it undergoes is studied in which branch of science?
chemistry
earth science
environmental science
biology
7
Indication of a physical change include all of the following except
condensation
evaporation
production of light
freezing
8
When a substance goes from a solid directly to a gas without passing through a liquid phase.
evaporation
condensation
sublimation
freezing
9
The X-axis on the graph represents which of the following?
temperature
Energy (absorbed heat)
solids
gases
10
Which of the following statements about physical & chemical changes is true?
physical changes alter atomic structure
both physical and chemical changes alter atomic structure.
chemical changes alter atomic structure.
neither physical or chemical changes alter atomic structure
11
Which of the following is considered a heterogeneous mixture?
sand, salt, water and iron filings
vanilla ice cream
steel
14 K gold
12
What phase is the letter E showing?
solid
gas
liquid
freezing
13
Pure substances consist of the following:
homogeneous and heterogeneous mixtures
heterogeneous mixtures and elements
compounds and homogeneous mixtures
elements and compounds
14
Which is true about physical and chemical changes?
Neither physical nor chemical changes are reversible
Physical changes tend not to be reversible
Chemical changes tend not to be reversible
Chemical changes tend to be reversible
15
Which of the following is not a physical change?
crushing a can
chopping wood
baking a cake
taking dry ice out of the freezer
16
Which of the following statements correctly explains the change that occurs when ice melts?
Ice melting is a chemical change, the state remains the same
Ice melting is a chemical change, the mass remains the same.
Ice melting is a physical change, the state remains the same
Ice melting is a physical change, the mass remains the same.
17
The atomic theory has changed over time. Why do theories change?
Popular vote determines theories
The time limit has run out on the current theory
New evidence partnered with technology
Someone decides they don't agree with the present theory
18
The Y-axis on the phase change diagram represents which of the following?
gas
energy (absorbed heat)
temperature
solid
19
Which of the following best describes the image shown?
element
compound
mixture of elements
mixture of elements and compounds
20
Which of the following is an element?
helium (He)
salt (NaCl)
carbon monoxide (CO)
aluminum chloride (AlCl3)
21
Which of the following best describes the image shown?
compound
element
mixture of compounds
mixture of elements
22
A substance that is made up of one type of atom is a(n) _____________________.
mixture
compound
proton
element
23
Carbon dioxide is considered a(n) ___________.
not chemically combined
mixture
element
compound
24
Which of the following is an example that includes evidence of a chemical change?
rock is smashed into smaller rock
sugar burning, turning brown with an odor
gold is put in water and sinks to the bottom
Ice melting
25
What is happening at the flat areas?
heat is increasing, temperature in increasing
heat is decreasing, temperature in increasing
heat and temperature are decreasing
heat is increasing, temperature is not increasing
26
At which temperature are the particles in the beakers moving fastest?
27°C
38°C
None of these
55°C
27
Scientific laws
explains why things happen
are the same as theories
are the same as traffic laws
describes what happens, with no explanation of why.
28
Scientific theories
Explain why things happen
describe what happens without trying to explain it
Are somebody's beliefs
Have no evidence
29
Indications of a chemical reaction include all of the following
except
change of shape
production of light
formation of a precipitate
production of gas
30
Which state of matter has no definite shape and a definite volume?
stones
gas
liquid
solid
