Question

need help with science; flvs. 7th gr. medal + fan.

Answer 1

When you change the amount of a substance, the time it takes to reach the boiling point

always increases

stays the same

always decreases

increases or decreases depending on how the amount changed

Answer 2

i would say D. or the 4th one but that is just the logical answer

Answer 3

I agree with @orion92898 . I would go with D.

Answer 4

yay exciting someone agrees with mees

Answer 5

Which of the following statements is true concerning a heating curve?

It is a pie chart that shows the phases of a substance.

It is a bar graph that shows a change over time.

It shows the phase changes of a substance over time.

It has nothing to do with heating a substance

Answer 6

Heating curve = bar chart.

Answer 7

B.

Answer 8

In which of these samples do the molecules most likely have the least kinetic energy?

molten iron at 1600°C

solid iron at 25°C

solid iron at 98°C

iron vapor at 2900°C

Answer 9

B.solid Iron at 25*C

Answer 10

At the moment a liquid is turning into a gas, the temperature

goes up.

goes down.

remains constant.

goes up and down very fast.

Answer 11

goes up

Answer 12

Which phase change results with decreased kinetic energy

freezing

solid to liquid

boiling

liquid to gas

Answer 13

idk that last one sorry

Answer 14

I think the last one is (A) freezing.

Answer 15

Which state of matter contains particles that move slightly in a fixed position?

plasma

liquid

gas

solid

Answer 16

solid i would think

Answer 17

I agree

Answer 18

WOOP!!

Answer 19

r u guys busy? need help with a few more

Answer 20

not really

Answer 21

shoot

Answer 22

As the moving sound source passes by, the pitch heard is lower due to

the lower frequency waves behind the moving source

the higher frequency waves behind the moving source

the waves behind have lower amplitude

the waves behind have higher amplitude

Answer 23

the doppler effect is the only thing that comes up in google