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WorksheetsReview UAS
Total questions: 35
Worksheet time: 18mins
What is a substance made of two or more elements that are chemically combined called?
A. element
B. compound
C. mixture
D. solution
Is salt (NaCI) a compound or an element?
Compound
element
What is the definition of a compound?
The smallest part of any substance which can exist on its own
Two or more atoms chemically joined together (can be the same or can be different)
A simple substance in which all the atoms are identical
Two or more different elements chemically joined together
A substance that cannot be broken down into any other substance by ordinary chemical means is called
a molecule.
a mixture.
an element.
a compound.
What is an example of a mixture?
Table salt
Water
Oxygen
Air
Which of the following can be beaten into thin sheets?
Sulphur
Oxygen
Zinc
Phosphorus
Which of the following is noble metal?
Sodium
Gold
Iron
Copper
Which of these is the most reactive metal?
gold
magnesium
sodium
platinum
Which of these is a property of metals?
It's very brittle
It can't conduct electricity
It's malleable
They are used in food
The word "luster" refers to which property of matter?
The ability to conduct electrical or thermal energy
Suitable for being shaped by beating or rolling
Capable of being drawn out into thin wires
The way a surface appears when it reflects light
The formula of sulphuric acid is
HSO4
H2SO4
H2SO3
H2SO3
How many different elements are in an amino acid with the formula C5H11NO2S?
5
20
18
4
Which elements are in the formula shown above?
Cobalt only
Carbon and Oxygen
Copper only
Carbon and Osmium
How many atoms of hydrogen are in the formula CH3CH2Br?
5
3
2
7
Which of the following is a correct statement about distillation
The components of the mixture have different densities
The components of the mixture have different melting points
The components of the mixture have different boiling points
The components of the mixture form a heterogeneous mixture
The process used to separate heterogeneous mixtures of solids and liquids is called
filtration
crystallization
distillation
chromatography
Four substances were tested for pH, lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Which of the following correctly lists the substances from most basic to acidic?
lemon juice, milk, baking soda, bleach
bleach, baking soda, milk, lemon juice
milk, lemon juice, baking soda, bleach
baking soda, bleach, lemon juice, milk
Which of these is a property of acidic solutions?
they taste sour
they feel slippery
they are in many cleaning products
they taste bitter
What type of reation occurs between an acid and a base?
Combustion
Synthesis
Neutralization
Double Replacement
The table shows the pH of several solutions. Which solution is the most acidic?
vinegar
milk
water
bleach
H3PO4 is an example of a ...
acid
base
salt
non-electrolyte
If a solution has a pH of 1.5, then litmus would turn
red
purple
blue
yellow
Pollution causes the pH of rain water fall below 5. What is such type of rain called?
acid rain
polluted rain
low pH rain
alkaline rain
What is an example of sublimation?
Ice cream melting
Dry ice being added to water
Frost forming on grass
A phase change from liquid to gas is called ...
condensation
evaporation
sublimation
deposition
