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WorksheetsPhysics and Chemistry - 3 ESO
Total questions: 85
Worksheet time: 53mins
The number written in front of atoms, ions and molecules in a chemical equation to balance the number of chemical elements in both sides.
digits
numbers
stoichiometric coefficients
chemical coefficients
A reaction that releases energy
Endothermic
Exothermic
Volatile
Crazy
Identify the following process: We light a matchstick.
Physical change
Chemical change
Identify the following process: The food and the air react.
Physical change
Chemical change
The initial substances before occurring the chemical reaction are called...
Reactants
Products
The new substances after occurring the chemical reaction are called...
Reactants
Products
What is the speed of this chemical reaction (rusting)
SLOW
FAST
The mass conservation law says
During a chemical reaction, atoms are destroyed. The number of atoms don't remains constant throughout the reaction.
During a chemical reaction, atoms are created. The number of atoms remains constant throughout the reaction.
During a chemical reaction, atoms are neither created nor destroyed. The number of atoms remains constant throughout the reaction.
Which of these changes are chemical changes?
Cutting a paper.
Boiling water.
The oxidation of an appel.
Respiration.
The main difference between a physical and a chemical change is that...
in a chemical change the color changes but in a physical change the color never changes.
new substances are produced in a physical change but not in a chemical change.
in a chemical change gases are emitted.
new substances are produced in a chemical change but not in a physical change.
What changes can you appreciate in this chemical change:
Change in color.
Change in odor.
Change in temperature.
Production of light.
Formation of a solid.
A chemical change is the same than a chemical reaction.
True.
False.
Which are the reactants in the following chemical reaction:
Methane reacts with oxygen to produce water and carbon dioxide.
Methane.
Water.
Oxygen.
Carbon dioxide.
Which are the products in the following chemical reaction: Sodium reacts with hydrogen chloride to produce sodium chloride and hydrogen.
Sodium chloride.
Hydrogen chloride.
Hydrogen.
Sodium.
New substances are produced in a chemical reaction because...
new atoms are created.
the atoms wich form the reactants reorder and join in a different way.
the atoms wich form the reactants disappear.
A chemical equation is...
the same than a chemical reaction.
a representation of a chemical reaction.
the same than a chemical change.
The law of conservation of mass was proposed by...
Mendeleiev.
Newton.
Lavoisier.
Einstein.
What is the value of X?
88 g
60 g.
44 g.
22 g.
The reaction rate is...
the concentration of the reactants.
the temperatura at which a chemical reaction takes place.
the mass of the reactants.
the speed of a chemical reaction.
To increase the speed of a reaction we can...
decrease the temperature.
increase the temperature.
decrease the concentration of the reactants.
increase the concentration of the reactants.
Force is ....
a pull that acts in an object
a push that acts in an object
a pull or a push that acts in an object
a pull or a puf that acts in an object
Choose the NON-CONTACT FORCES
Gravity
Buoyancy
Friction
Magnetism
Gravity...
is a force that pulls all objects towards their center
is a force that controls your body
is a force that repels objects
Magnetism can...
only attracts objects
only repels objects
attracts or repel objects
What is going to happen?
They will repel
They will attract
NOTHING
When an object or a person moves another by touching it, it´s a...
Contact force
Non-contact force
Which is the unbalanced force?
Magnetism can...
only attracts objects
only repels objects
attracts or repel objects
Which method is usually NOT used to collect data in the laboratory?
looking for a color change
feeling for the production of heat
listening for the escaping of gases
testing by taste
Which metric prefixes means 0.01?
milli-
hecto-
deci-
centi-
Which piece of laboratory equipment should be used to correctly measure the volume of a liquid?
a test tube
a graduated cylinder
an unmarked erlenmeyer flask
a triple beam balance
Which of the following is used to measure the mass of an object?
barometer
metric ruler
graduated cylinder
balance
The metric abbreviation for millimeter is...
mm
cm
milli-
m
Where should the student position himself to read the graduated cylinder properly?
A.
B.
C.
D.
What is referred to as a measure of the force of gravity acting on an object?
density
mass
weight
volume
This experiment was set up to test the hypothesis that plants grow faster in green light. The same amount of water and fertilizer were added to each pot. Which of these would improve the experiment?
use the same kind of plant in all trials
add more types of plants
use green lights for all three plants
use different pots for each plant
Which laboratory apparatus would you use to measure 75ml of water accurately?
Which laboratory apparatus is a measuring cylinder?
Which laboratory apparatus is a beaker?
Which laboratory apparatus is a syringe?
The laboratory apparatus above are used to measure _____________ .
mass
length
volume
temperature
The laboratory apparatus above is used to measure ______________ .
mass
length
volume
temperature
The laboratory apparatus above is used to measure __________ .
mass
length
volume
temperature
The apparatus above are used to measure _________ .
mass
length
volume
temperature
Which apparatus is a laboratory thermometer?
Safety goggles should be worn during the laboratory experiments to…
improve vision
protect your face
protect contact lenses
protect eyes
all of the above
When performing a laboratory assignment…
read procedure beforehand to understand what to do
follow the teacher’s instructions
look out not only for your safety but also that of partners
none of the first three answers
all of the first three answers
If a chemical gets in your eyes…
immediately wipe the chemical off your eyes
immediately use the eyewash station
place eye drops from the instructor in your eyes
inform the instructor before taking other action
all of these are appropriate
While working in the lab, a chemical spills on your hand. The first thing you should do is…
wipe the chemical off with a paper towel
immediately dip you hands in water
clean up your mess before taking other action
clean up as the teacher said
have your friend tell the teacher
If you injure yourself by accidentally cutting or piercing your skin…
begin administering first aid
scream like a baby to warn others
stay where you are and
have your partner notify the instructor
notify the instructor yourself
check for any updates to your safety rules
If you have a spill (but not on yourself) that involves broken glass…
begin cleaning up the spill as instructed
scream like a baby to warn others
stand over spill, partner notifies instructor
notify the instructor yourself
check for any updates to your safety rules
In the event of Eye Safety, people with glasses must still use goggles.
True
False
Students may wear open-toed shoes, but only if they also wear pants.
True
False
Apparatus used for heating small quantity of chemicals
Beaker
Flask
Test tube
Gas jar
Name this apparatus
Spirit lamp
Burner
Bunsen burner
Automatic flame
Mention the use of this apparatus
For keeping the test tube
For supporting the apparatus during heating
For drying other apparatus
Used as a shelf
Mortar and pestle is used for ________
Mixing chemicals
Grinding and crushing solid substances
Both
Which of the following is the correct laboratory rule?
Eating in the laboratory while doing practical during lunch time
Running in the laboratory when he is in a hurry
Poking the electrical power points with sharp objects
Using the apparatus in the laboratory only when told to do the science teacher
The following are some safety rules in a laboratory. Which one is not correct?
Do not eat or drink in the laboratory
Do not report any injury, however small, to the teacher
Do not taste chemicals in the laboratory
Do not run in the laboratory
Identify this laboratory tool.
petri dish
evaporating dish
funnel
mortar and pestle
Identify this laboratory tool.
beaker
graduated cylinder
Erlenmeyer flask
test tube
Which of the following laboratory tools is used to measure the mass of an object?
Which laboratory tool should NOT be used in measuring the volume of liquids?
Which laboratory tool is used to measure the weight of an object?
What is the function of this funnel?
to mix liquid or solutions
to transfer liquid into a container with a small opening
to make tiny objects appear bigger
to support another apparatus during heating set-up
Why is a graduated cylinder more accurate than a beaker in measuring the volume of a liquid?
Graduated cylinder is longer than a beaker.
Graduated cylinder has more calibrations than a beaker.
Graduated cylinder has a better shape than a beaker.
Graduated cylinder has a colorful liquid than the liquid in the beaker.
What is always used with a filter funnel?
A filter paper
A test tube
A beaker
A conical flask
What two things determine the gravity of an object?
mass & weight
mass & distance
density & mass
volume & distance
