WorksheetsTest No.2 for students of chemistry
Total questions: 50
Worksheet time: 25mins
1.The group made up of alcohols and acids
esters
alkynes
ethers
carbocilic acids
The name of this compound C4H10
hexane
methane
butanoic acid
butane
Which compound is made up of carbons and hydrogen
condensed structure
alcohols
hydrocarbons
aldehydes
Which reaction that releases oxidising agents, heat and light
substitution
addition
combustion
Name the group that has a single bond
ethers
alcohols
alkenes
alkanes
Which bond does carbon mostly form
dipole-dipole
hydrogen bond
covalent bond
What are the outer most electrons called
valency
valence
energy level
Organic polymer can be divided into
natural organic polymer
synthetic organic polymer
all of the above
the type of reaction that occurring alkenes
addition
elimination
substitution
molecule with the same molecular structure but different structural formula
isomers
fossil fuels
fats
lipids
molecules with double/ tripple bond
unsaturated fats
saturated fats
carbocilic acids
alkynes
Signs of a chemical change include
change of colour, reversing back to original form, precipitate (solid) formed, gas released.
change of colour, change of temperature, precipitate (solid) formed, gas released.
If an acid is diluted it
is corrosive and cannot be eaten
has a large amount of water mixed into it
is very "acidus" sour
has a small amount of water mixed into it
Water is the product of the reactants:
hydrogen and oxygen
oxygen and carbon
oxygen and water
atomic number is
the location of an atom on the periodic table
the number of neutrons
the number of electrons
the number of protons
A Ph scale of 7/8 is
neutral
basic
acidic
To neutralise an acid you add a
acid
base
Ph indicator
equal amount of water
Conservation of mass means
all the atoms present before a chemical reaction are not present after
atoms present before chemical reactions are present after
new substances and new elements are formed in a chemical reaction
A molecule is
2 or more atoms that are combined
a singular particle of a particular element
another name for an element
A pure substance that is a compound is made out of
particles of more than one type of atom
particles of the same type of atom
a mixture of two or more substances that can be physically separated
Atomic Mass is the number of
protons and neutrons in the nucleus of an atom
neutrons and electrons in the nucleus of an atom
protons and electrons in the nucleus of an atom
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and
atoms remain the same and do not form new bonds to make the products.
atoms rearrange and form new bonds to make the products.
An element is
a substance that can be split into simpler substances
a substance that cannot be split into simpler substances
bases are the same as an acid
false
true
which of the statements on physical changes are correct
A physical change cannot be reversed
A physical change is where new substances are formed
A physical change is a change in state
A physical change is a change in form
An electron is
negatively charged
positively charged
neutral
Characteristics of metals on the periodic table are
they are not able to be oxidised
have free electrons
they are poor conductors of heat and electricity
When an acid reacts with a metal following is the product
salt + hydrogen
salt + carbon dioxide + water
Which of these BEST describes a physical change?
the amount of water in a pan decreases
rust forms on your bicycle
fireworks explode
a log in the campfire turns into ashes
Which of the following would be evidence that a chemical change has occurred?
new substance formed
change in size
change in shape
change in state
Color, shape, texture, and size are ________________________ properties of matter.
chemical
physical
liquid
solid
Paper burning is a ___________________________________ change.
chemical
physical
Which example below is a chemical reaction?
grape juice freezing
ice melting
lighting a match
water boiling
Dry ice (solid carbon dioxide) turning into carbon dioxide gas is a
physical change
chemical change
An iron nail rusting is a ____________________________ change. The ____________________________ property of reactivity explains the iron's ability to form a new substance.
chemical, chemical
physical, chemical
chemical, physical
physical, physical
Which of these phrases describes the results of a chemical change?
salt dissolving in water
gold nuggets melting
charred wood, ash, and smoke
a dented car door
Let us imagine that there is a jar holding oil, syrup, and water. It would be easy to pour off the oil to separate from both the syrup and water because the liquids have different
volumes
temperatures
densities
masses
The density of a piece of gold jewellery is often used to determine its purity. Density is what kind of property?
colligative
extrinsic
physical
chemical
Water freezes and melts at 0 degrees C. Melting point is what kind of property?
chemical
physical
colligative
extensive
The following changes (melting wax, evaporating gasoline, freezing water) are all examples of
physical changes.
chemical changes.
nuclear changes.
energy consumption.
Dry ice (solid carbon dioxide) turning into carbon dioxide gas is a
chemical change
physical change
Which of these is a property of metals?
Malleable
Can't conduct electricity
Very brittle
Which is an example of an heterogenous mixture?
salad
soy sauce
tea
guacamole
A group of elements that are shiny, conduct heat and electricity well is called
Non-metals
Metals
Metalloids
What does the nucleus of an atom contain?
DNA
Electrons and neutrons
Protons and neutrons
Electrons and protons
What is the law of conservation of matter?
Matter changes when reacted or changed.
The mass of the reactant is the same as the mass of the products.
The mass of the products is different than the mass of the reactants.
The mass of all reactants are changed during a physical or chemical change.
What is made up two or more elements that are chemically combined?
Mixture
Compound
Atom
Element
If an atom has 3 electrons, how many protons does it have?
4
2
3
1
The opposite phase of melting is
Condensation
Freezing
Vaporization
Sublimation
Metals are located on what size of the periodic table?
left
right
the bottom
the stairway
