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WorksheetsCHEMISTRY 1 END OF SEMESTER EXAMINATION MANNING HIGH SCHOOL P1
Total questions: 40
Worksheet time: 40mins
The first step in the scientific method
Question
Hypothesis
Observation
Experimentation
What is a dependent variable?
The factor changed on purpose to test the hypothesis
The factor which doesn't change during the experiment
The factor which responses to the change in another factor
The factor on which other factors depend
Why might a scientist reject a scientific theory?
New evidence shows it to be false
The topic is too strange
Someone disagrees with it
He wants to prove it wrong
This instrument is used for
Measuring mass
Measuring temperature
Measuring volume
Measuring distance
Name this laboratory instrument
Erlenmeyer flask
Volumetric flask
Round bottom flask
Flat bottom flask
If a fire erupts, immediately
notify the teacher
throw water on the fire
run into the storage closet.
open the window
If you wash your hands with soapy water and rinse with plenty of clean water, you may feel free to eat in the chemistry laboratory.
True
False
What phase change is occurring when solid air refresher kept in your car gradually reduces in size?
Melting
Evaporation
Sublimation
Deposition
Without using air conditioner or heater in your car on a cold day, you notice that the inner surfaces of your windshield and windows become cloudy as mist of water droplets form on the surface. The process occuring on the cold surfaces is.......
Melting
Deposition
Evaporation
Condensation
This phase change is exothermic
Freezing
Sublimation
Melting
Boiling
Melting takes place on this portion of the phase diagram
A-B
B-C
C-D
D-E
The melting point of the substance whose cooling curve is shown is............
140
100
0
-20
What subatomic particle is responsible for the spectral lines seen in emission spectra diagrams?
Positron
Neutron
Proton
Electron
Who is responsible for the model of the atom where electrons travel in specific paths or orbits around the nucleus?
Bohr
Dalton
Rutherford
Thompson
Absorption of energy by an electron results in
it moving from the ground to an excited state
the emission of a photon
it moving from an excited to the ground state
it moving from an excited to the ground state and the emission of a photon
How many electrons does this atom have?
2
3
5
7
The atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is
9
18
19
28
Which of the following determines the identity of an element?
Number of protons
Number of neutrons
Number of electrons
Number of electron shells
When the isotope 5024X releases an alpha particle we get another element Y that looks like
5022Y
4622Y
4820Y
5023Y
In order of most to least penetrating radiation we have
Alpha , Beta, Gamma
Beta , Gamma , Alpha
Gamma, Alpha, Beta
Gamma, Beta, Alpha
What is the missing isotope that will balance the following nuclear equation?
94Be + 11H → _____ + 42He
63Li
105Ne
63C
105B
Negatively charged particles emitted from a nucleus at a high speed are ____.
X rays
alpha particle
gamma rays
beta particles
Which characteristics describe an acid?
tastes sour, litmus indicator turns red
tastes sour and bitter, litmus indicator turns blue
tastes bitter, litmus indicator turns blue
tastes sweet and sour, litmus indicator turns red
When Sally tested an unknown solution, her red litmus paper turned blue, but her blue litmus paper remained blue. What does this indicate?
unknown is acidic
unknown is alkaline
unknown can be acidic, alkaline or neutral
unknown is neutral
Which pH number below reflects a weak acid?
2
6
8
12.5
After a chemical reaction, the beaker feels cold to the touch. This is reaction is likely .................
negative
exothermic
positive
endothermic
The table shows the pH of several solutions. Which solution is the strongest base?
Vinegar
Milk
Water
Bleach
Why do atoms form chemical bonds with other atoms?
to get equal number of protons and electrons
to get a full octet of valence electrons
to get more protons than electrons
to get more neutrons than electrons
The electrons in an atom that take part in chemical bonding
core electrons
valence electrons
non-valent electrons
bonding electrons
The name of this compound CaO is (a)
The formula of Aluminum chloride is
(a)
What does the Law of Conservation of Mass state?
Matter cannot be gained or lost in a chemical reaction.
Matter can only be lost in a chemical reaction.
Matter can be gained and lost in a chemical reaction.
Matter can only be gained in a chemical reaction.
How many atoms of carbon (C) are in C6H12O6?
6
12
18
24
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
1
2
3
4
The law of conservation of energy states that
energy is the capacity to do work or to supply heat
in any chemical or physical change, energy cannot be created or destroyed, only changed in form.
there are two types of energy, kinetic and potential
heat changes occur during chemical and physical changes.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction.
reactant
product
catalyst
solvent
Which of the following increases the reaction rate?
using large particles of reactants
using smail particles of reactants
placing reaction mixture in ice-cold water
adding water to 2M solution
Why does a higher concentration increase the rate of reaction?
it increases the amount of reactants
it increases the energy of particle collisions
it increases the frequency of particle collisions
it lowers the activation energy
What is the rate of reaction?
How fast a reaction goes
How far a reaction goes
How much reactant is used
How much product is formed
Why does a higher concentration increase the rate of reaction?
it increases space between reacting particles and increases frequency of collision
it decreases space between reacting particles and decreases frequency of collision
it increases space between reacting particles and decrease frequency of collision
it decreases space between reacting particles and increase frequency of collision
