Question

Last and final study guide Questions I cannot Answer

Answer 1

Consider the unbalanced equation for the oxidation of aluminum.

_Al + _O2 -- _Al2O3

Which sequence of coefficients should be placed in the blanks to balance this equation?

Answer 2

Which characteristics are shared by electromagnetic and mechanical waves? Check all that apply.

Both have a crest and a trough.
Both move due to particles bumping into each other.
Both can move through matter.
Both occur as a result of a disturbance.
Both are formed by charged particles.

Answer 3

A convex mirror is placed to the right of an object. The image formed by the mirror will be a

real image that appears to be on the right of the mirror.
real image that appears to be on the left of the mirror.
virtual image that appears to be on the right of the mirror.
virtual image that appears to be on the left of the mirror.

Answer 4

Based on the activity series provided, which reactants will form products?

F > Cl > Br > I
CuI2 + Br2 -->
Cl2 + AlF3 -->
Br2 + NaCl -->
CuF2 + I2 -->

Answer 5

Consider the energy diagram below.


Which statement best describes the diagram?
The pathway A-B-D involves a catalyst and is slower than A-C-D.
The pathway A-B-D involves a catalyst and is faster than A-C-D.
The pathway A-C-D involves a catalyst and is slower than A-B-D.
The pathway A-C-D involves a catalyst and is faster than A-B-D.

Answer 6

@JustSaiyan help please :)

Answer 7

Which of the following is an oxidation-reduction reaction?
SO2(g) + H2O(l) >> H2SO3(aq)
CaCO3(s) >>CaO(s) + CO2(g)
Ca(OH)2(s) + H2CO3(l)>> CaCO3(aq) + 2H2O(l)
C6H12O6(s) + 6O2(g) >>6CO2(g) + 6H2O(l)

Answer 8

These are basically the questions i get stuck on

Answer 9

I would say the first one is
`4Al + 3O2 -- 2Al2O3`

The second is
`Both occur as a result of a disturbance.`
`Both are formed by charged particles.`

The third is
`virtual image that appears to be on the left of the mirror.`

The fourth will be
`Br2 + NaCl` I think, as they balance each other.

The fifth I need to see the diagram

The sixth should be
`C6H12O6(s) + 6O2(g) >>6CO2(g) + 6H2O(l)`

Answer 10

diagram for 5th

Answer 11

I would say it's `The pathway A-B-D involves a catalyst and is faster than A-C-D.`

Answer 12

The field lines around one end of a bar magnet are shown below.


Based on the diagram, what can you conclude about the pole of the magnet?

It is a south pole because the field lines spread out from this end.
It is a north pole because the field lines spread out from this end.
It is a south pole because the field lines enter the magnet at this end.
It is a north pole because the field lines enter the magnet at this end.
I think its D

Answer 13

but im just checking to be sure

Answer 14

`It is a south pole because the field lines enter the magnet at this end.` You can tell by the fact that the lines are pointed at the magnet, unlike the north side, which they face away from.

Answer 15

oh alright i get that confused sometimes

Answer 16

Which is a feature of a single replacement reaction?
Substance XYZ breaks down into X and YZ.
Substance G reacts with compound XY to form GY and X.
Substance X burns rapidly in the presence of oxygen.
Substance QR and GT exchange ions with each other.

Answer 17

`Substance G reacts with compound XY to form GY and X.`

Answer 18

When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride than what is required to form the bonds of the new substance.

What is happening in the reaction?

An endothermic reaction is occurring.
An exothermic reaction is occurring.
Energy is being released into the surroundings.
Energy escapes as light into the surroundings

Answer 19

`An endothermic reaction is occurring.`

Answer 20

A circuit is a path along which electric current flows. How would changing the battery in a circuit from 9 volts to 1.5 volts most likely affect the circuit?

More electric charge would flow in the circuit.
Less electric charge would flow in the circuit.
The rate at which the current flows would decrease.
The rate at which the current flows would increase.

Answer 21

`Less electric charge would flow in the circuit.` You lowered the voltage, it will be insufficient to power it.

Answer 22

Farah is doing an experiment that involves calculating the speed of a longitudinal wave. What will most likely happen if she increases the temperature in the room?

The amplitude of the wave will increase.
The amplitude of the wave will decrease.
The speed of the wave will increase.
The speed of the wave will decrease.

Answer 23

sorry i didnt run into a hard question for a bit

Answer 24

`The amplitude of the wave will decrease.` The wavelengths will be greater in a lower temperature because they the air molecules move slower.

Answer 25

Don't worry about it, this is fine.

Answer 26

Look at the diagram of a fuel cell below.


Which part of the fuel cell does A represent?
air
anode
cathode
electrolyte

Answer 27

The electrolyte.

Answer 28

Hamid is viewing an image of a bird produced by a set of concave lenses. What must be true about the image?

It is a virtual image.
It is upside down.
It is larger than the actual bird.
It is capable of being projected.

Answer 29

The diagram shows a clear glass lens.



Which best describes what happens when light rays move from air, through the lens, and back to air?

The light rays refract toward a central axis.
The light rays spread apart as they exit the lens.
The light rays converge toward a single point.
The light rays diverge before entering the lens.

Answer 30

Which types of electromagnetic waves have frequencies that are higher than those of ultraviolet light but lower than those of gamma rays?

microwaves
X-rays
infrared light
radio waves

Answer 31

for glass lense i think its C

Answer 32

`The light rays spread apart as they exit the lens.` this makes the bird seem bigger as well.
The second one is `X Rays`

Answer 33

The diagram below shows the energy conversions of the Krebs cycle, which is part of cellular respiration. The U-shaped arrows that show changes for NAD+, FAD, and ADP molecules represent energy conversions. From each glucose molecule, two acetyl-CoA molecules are made for the Krebs cycle.


How many energy conversions occur when both acetyl-CoA molecules go through the Krebs cycle?
5
6
10
12

Answer 34

It would be 6. 2 from each part. It only produces a fraction from what goes into it.

Answer 35

Which would increase the speed of a sound wave? Check all that apply.

A wave passes from a solid to a liquid while remaining the same temperature.
The medium increases in temperature while remaining in the same phase.
The medium decreases in temperature while remaining in the same phase.
A wave passes from a gas to a liquid while remaining the same temperature.
A wave passes from a liquid to a gas while remaining the same temperature.

Answer 36

`A wave passes from a solid to a liquid while remaining the same temperature.`

Answer 37

is that the only one?

Answer 38

Which changes will decrease the electric force between two positively charged objects? Check all that apply.

moving them closer together
moving them farther apart
adding electrons
removing electrons
adding neutrons
removing neutrons

Answer 39

`moving them farther apart`
`adding electrons`

Answer 40

Which is the correct order of processes that occur for water to move from a lake to a cloud and then turn into rain?
evaporation, condensation, precipitation
condensation, evaporation, precipitation
precipitation , condensation, evaporation
evaporation, precipitation, condensation
I probably know this but this is the final question i need to pee brb

Answer 41

evaporation, condensation, precipitation

Answer 42

7 9 10 11 13 16 20 38 40 44 45 47 i have redo these numbers my teacher tells me

Answer 43

im sad

Answer 44

but if i turn it in its a C

Answer 45

Which ones were the ones I answered?

Answer 46

umm idk

Answer 47

lemme chek

Answer 48

You don't have to if you don't have time. I just like to know which ones I got wrong.

Answer 49

u answered 7 10 11 13 38 45 47
I answered 9 16 20 40 44

Answer 50

Hmmm.

Answer 51

im dumb i didnt even answer number 45

Answer 52

Hamid is viewing an image of a bird produced by a set of concave lenses. What must be true about the image?

It is a virtual image.
It is upside down.
It is larger than the actual bird.
It is capable of being projected.

Answer 53

C.

Answer 54

7
Which characteristics are shared by electromagnetic and mechanical waves? Check all that apply.

Both have a crest and a trough.
Both move due to particles bumping into each other.
Both can move through matter.
-Both occur as a result of a disturbance.
-Both are formed by charged particles.

Answer 55

those are the ones we put

Answer 56

Did I answer this one?
`Both have a crest and a trough.`
`Both can move through matter.`
`Both are formed by charged particles.`

Answer 57

i think so

Answer 58

Penelope sees that her brother Angelos is using water carelessly. She warns Angelos to be more careful because water is a renewable resource and can be used up since it takes millions of years to form. Angelos argues that water is a nonrenewable resource and cannot be used up since it can be replaced when it rains.

Which statement is best supported by this scenario?

Penelope was correct when she said that water takes millions of years to form.
Penelope was correct when she said that water can be used up.
-Angelos was correct when he said that water is a nonrenewable resource.
Angelos was correct when he said that water cannot be used up.

Answer 59

i messed this up

Answer 60

i know this

Answer 61

LOL I AM DED. "Water is a renewable resource, which means it can be used up and takes millions of years to form" THAT IS HILARIOUS

Answer 62

yea ik this confused me

Answer 63

i wanted to put Angelos is right but like they are both wrong

Answer 64

or i mean penelope

Answer 65

71% of the Earth is water, it's hardly being used up. It is definitely D.

Answer 66

A convex mirror is placed to the right of an object. The image formed by the mirror will be a

real image that appears to be on the right of the mirror.
real image that appears to be on the left of the mirror.
virtual image that appears to be on the right of the mirror.
-virtual image that appears to be on the left of the mirror.

Answer 67

Based on the activity series provided, which reactants will form products?

F > Cl > Br > I

CuI2 + Br2 >
Cl2 + AlF3 >
-Br2 + NaCl >
CuF2 + I2 >

Answer 68

The first is D.

Answer 69

thats what we put and it was wrong

Answer 70

im gonna try c since its closest to d

Answer 71

Choose B. then

Answer 72

nvm

Answer 73

ill go with B

Answer 74

try CuI2 + Br2 > for the second

Answer 75

Consider the energy diagram below.


Which statement best describes the diagram?
The pathway A-B-D involves a catalyst and is slower than A-C-D.
The pathway A-B-D involves a catalyst and is faster than A-C-D.
The pathway A-C-D involves a catalyst and is slower than A-B-D.
The pathway A-C-D involves a catalyst and is faster than A-B-D.

Answer 76

The answer we put was B

Answer 77

Try D.

Answer 78

Oh cool

Answer 79

my teacher said im good to turn in now i have a B

Answer 80

she said even if i got 100% i would still have a B

Answer 81

i got a 92%

Answer 82

👌Congrats.

Answer 83

heck yea