WorksheetsBCA Diagram Concepts
Total questions: 50
Worksheet time: 24mins
What happens if a (s) which is 20 K below its melting point is heated up 10 K? Describe the particles.
The particles are vibrating faster after being heated.
The particles are slightly expanding during heating.
The particles remain much more dense as a (s) than a liquid, except for water.
All the other choices are correct.
When heating a system of hydrocarbon fuel like methane in the presence of oxygen in the air, the chemical change of combustion does which of the following:
produces new substance(s)
is exothermic
gives off heat
sometimes gives off light and changes color
all the other answers are correct
When the amount of energy of the products is represented by a negative number of KJ/mol then its chemical reaction is:
giving off more heat than it took into the system
exothermic
heating up the environment around the system
all the other answers are correct
Which will be most exothermic when it burns in complete combustion?
CH4 (methane)
C3H8 (propane)
C4H10 (butane)
C8H18 (octane, aka "pure gasoline")
C21H44 (wax paraffin)
Increasing the Temperature of a system of particles will cause them to move:
slower
the same speed
faster
What happens at the moment of highest heat of formation (KJ/mol) during a hydrocarbon fuel combustion reaction?
bonds are being broken & made
motion of particles, but the chemical bonds never break during a chemical change
nothing, because this "C stage" is stable and unchanging
fuels & oxygen are being destroyed
What happens during a chemical change?
building blocks of substances are recombined
new substances are being made
the chemical make-up (aka: "composition") of the starting chemicals change
chemical bonds are being broken & made
all the other choices are correct
What are the indicators or hints of a chemical change?
new light is produced
new heat is produced
new color is produced
new solid or gas is produced
all the other choices are correct
When you look at our boiling point graph, we see that:
chemical substances have their own specific boiling points
water has a relatively high boiling point
He boils at a relatively low temperature
all the other choices are correct
Many of the Air molecules (N2, O2, He, Ar, Ne...) have similar boiling points
What state burns in a wax paraffin candle and most hydrocarbon fuels?
solid
liquid
gas
(aq)
Which has the lowest boiling point?
ammonia (NH3)
methane (CH4)
oxygen (O2)
Water (H2O)
What substance has a melting point that is higher than the other 3 listed?
methane (CH4)
Oxygen (O2)
ammonia (NH3)
water (H2O)
What is true of hydrocarbon combustion?
The oxygen is the fuel, not the wax.
It makes carbon dioxide (CO2) and water (H2O).
It is endothermic overall.
Only a chemical change occurs; no physical changes occur at the same time.
Which is the smallest of the following building blocks? Check your Periodic Table.
He
O
Mg
Fr
Since 1743 the Celsius scale has been based on 0 °C for the freezing point of water and 100 °C for the boiling point of water at 1 atm pressure. What is true of 0 degrees C?
It is the melting point of ice.
It is the temperature at which both solid and liquid particles of a particular substance can exist.
It is the same temperature at which water freezes.
Equal to 273 K.
all the other choices are correct
At what amount of energy in KJ/mol are the starting chemicals transitioning into new substances during a chemical change?
-360
-350
-345
-335
-325
Which of the following is the correct order of events in a forward acting chemical changes?
reactants, transition states, products
products, reactants, transition states
products, transition states, reactants
reactants, products, transition states
Water and carbon dioxide are both:
elements
compounds
Which of the following correctly describes solid, liquid, and gas states of matter?
Solids are more tightly packed & experience vibration motion
liquids are experiencing mainly sliding motion
gas particles are mainly colliding and spreading
all of the other answers are correct
CO2 has how many carbons and oxygens per molecule?
1 C: 2O
2 C: 1 O
2 C: 2 O
1 C: 1O
How many carbon and oxygen atoms exist per molecule for CO (carbon monoxide)?
1 C: 1 O
1 C: 2 O
2 C: 2 O
2 C: 1 O
C21H44 has how many carbon and hydrogen atoms for our single bonded hydrocarbon fuels?
C2 : H4
Cn : H(2n+2)
Cn : H2n
More carbons than there are hydrogens.
Law of Conservation of Mass can be proved experimentally by using what tool before and after a chemical treatment?
using a thermometer
using a graduated cylinder
using a gram scale
reading the colors of the chemicals
Pressure is the amount of:
average kinetic energy
collision force exerted between particles & other matter
matter
space
amount of heat needed to make a new substance
Chemistry is the study of:
Matter
properties of matter
changes in matter
all the other answers are correct
If you burn a hydrocarbon in a closed system where oxygen gets used up, what will happen?
a flame will eventually go out
more CO (g) will be made than normal, and less CO2 (g) will be made
a flame will get brighter
a flame will get brighter and produce more CO2 (g)
a flame will eventually go out and produce more CO (g), but less than normal CO2 (g)
What is another word for kinetic energy measure in an absolute amount of KJ/mole?
Heat
Pressure
Mass
Volume
Temperature
What is a proper title for this science graph?
Heat Added (Joules)
Temperature
(degrees Celsius)
Aluminum vs. Water Properties
Heat Added (Joules) vs. Temperature (degrees Celsius)
Temperature vs. Heat Added
What is the dependent variable on this graph?
time of heating (s)
Heat of Formation (KJ/mol)
Temperature (K)
Pressure (psi)
What tool or tools could NOT have been used to increase the heat of formation (KJ/mol) from the far right reactants to the top of the curve transition state?
Bunsen Burner
gram scale
stirring rod
match
lighter
What are 3 important ingredients of fire?
fuel
oxygen
spark or ignition source
all of the other answers are correct
What state of matter is most compressible?
solid
liquid
gas
all three main states are equally compressible
Which of the following is the "weakest" physical change evidence that is an indicator of a chemical change?
new heat
new light
new color
new solid
new gas
Sublimation is what type of change?
physical
chemical
Crumbling a cookie is what sort of change?
Physical
Chemical
What would be a good title for this Science Graph?
Atomic Number vs. Electronegativity (Pauling)
The Pattern of Atomic Number.
Electronegativity vs. Atomic Number
The Pattern of Electronegativity
Pick the correct answer.
Pauling is the unit for atomic number
Pauling is the unit for Electronegativity
There is no unit for Electronegativity
It is not important to ever write the unit of measurement
Pick the correct answer.
The Electronegativity is not changing when Atomic Number Changes.
Usually when Atomic Number goes up Electronegativity goes down.
Usually when Atomic Number goes up so does Electronegativity.
When Atomic Number goes up Electronegativity stays the same (goes constant).
Flammability is what type of property?
nuclear
chemical
physical
If we run a chemistry investigation at a constant room temperature of 298 Kelvin, what is that in degrees Celsius?
0
100
25
32
True or False: A chemical system set at a constant temperature of 25.0 degree Celsius will have all of its particles are moving at the same velocity.
true
false
If we use a vacuum pump to lower the air pressure around a chemical (like a marshmallow, a slightly inflated balloon, or a room temperature beaker of water), what will happen to the total volume of the chemical particles for each scenario?
Answer: The particles' volume will:
compress or come together (aka: get smaller)
spread out (aka: get larger)
stay the same size
When the outside Temperature decreases by 30 degrees Celsius, the air pressure in your car tires will show what?
a decrease in tire pressure
an increase in tire pressure
no change in tire pressure
What does the inside of a candle flame look like, and does it experience complete combustion?
yellow throughout; yes candles burn all the fuel
hollow; yes candles burn all the fuel
hollow; there is a lot of unused fuel that is not burned
What is needed to light a fire?
fuel, a spark or heat, & oxygen
fuel & a spark or heat
fuel & oxygen
hot sauce & chips
a spark or heat & oxygen
Consider one type of chemical substance in 3 different states.
Which of the following has particles that are colliding and spreading?
solid
liquid
gas
Which is the most ordered state of matter that also keeps its own shape typically?
solid
liquid
gas
Which of the following scenarios is not a chemical change?
iron rusting
silver tarnishing
a stained shirt whitening
grass clippings decomposing
water boiling
What is the Independent Variable in this science graph?
Atomic number
Electronegativity
There is none.
Electronegativity (Pauling)
How many states of matter can exist at the melting point of wax paraffin?
1 (solid)
1 (liquid)
2 (solid & liquid)
2 (liquid & gas)
