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WorksheetsCBA Chemistry Review
Total questions: 19
Worksheet time: 2hrs 33mins
A granular substance is added to a liquid. Which of the following would provide evidence to suggest a chemical change has taken place?
the volume of the liquid increases
the granules dissolve
the liquid gives off heat
the granules get smaller
A student has a substance with a density of 2 g/cm3. What sample does the student have?
Sample 1 - mass 89 g volume - 50 cm3
Sample 2 - mass 26 g volume - 15 cm3
Sample 3 - mass 23 g volume - 100 cm3
Sample 4 - mass 160 g volume - 80 cm3
A sample of an unknown substance has a mass of 28 g and a volume of 4 cm3. What is the density for this sample?
19 g/cm3
7 g/cm3
11g/cm3
9 g/cm3
Which of the following characteristics is shared by all chemical reactions?
releases heat energy
shows a color change
forms a new substance
produces a precipitate
A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite cold and then turned bright green in color. The 1st indication there was a chemical change was when ---
the crystals were added to the liquid
the crystals dissolved in the liquid
the temperature of the liquid decreased
the color of the mixture changed
The elements are Argon, Krypton, and Xenon are all non-metals. What property would these elements have in common?
soft and malleable
poor conductor of electricity
shiny, lustrous surface
good conductor of thermal energy
While two elements are the most common in the rocky outer surface that makes up the Earth's lithosphere?
oxygen and carbon
nitrogen and oxygen
oxygen and hydrogen
silicon and oxygen
The oceans are primarily composed of which two elements?
carbon and hydrogen
calcium and silicon
hydrogen and oxygen
nitrogen and phosphorus
The atmosphere of the Earth is comprised mostly of oxygen and
carbon
hydrogen
silicon
nitrogen
All of the following elements make up most of the living things on the Earth except -
carbon
silicon
hydrogen
oxygen
Metals are.....
dull, brittle, insulator
shiny, brittle, semiconductor
shiny, malleable, conductor
shiny, malleable, insulator
Nonmetals are...
shiny, brittle, semiconductors
shiny, malleable, conductor
dull, brittle, insulator
dull, malleable, insulator
Metalloids are ---
shiny, brittle, conductor
dull, brittle, conductor
shiny, brittle, conductor
dull, malleable, semiconductor
How many different elements are represented in the chemical formula CH4 + 2O2 --> CO2 + 2H2O
7
5
4
3
Hydrogen (H) is considered an element, while water (H2O) is considered a compound. This is because water is...
A liquid at room temperature
made of two different elements
given off by plants during transpiration
useful to humans
The density of an unknown substance is 9 g/mL. The volume of the substance is 4 mL. What is the mass?
13 g
5 g
36 g
2.25 g
Mrs. Clark has a candy bar and wants to know its density. The candy bar's mass when put it on the scale was 72 g. The volume of the candy bar was 8 cm3. What is the density of the candy bar?
.11 g/cm3
9 g/cm3
64 g/cm3
576 g/cm3
The smallest part of an element is known by which term?
symbol
chemical
atom
compound
A _________________ consists of atoms of different kinds of elements that are bound together and are pure substances represented by a chemical formula.
atom
molecule
compound
element
