CHEMISTRY MIDDLE SCHOOL

Factors that remain the same throughout an experiment? What is the word

Answers

Answer 1
Answer: their called constants

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Sodium(na) is a highly reactive metal and chlorine is a poisonous gas. Which compound do they form when they chemically combine?

Answers

Sodium lose one electron and convert into sodium ion Na+

Chlorine lose one electron and form Cl- ion

When these ions come together they from an ionic compound NaCl,

table salt

The ionic compound which consist ionic bond. The ionic bond is a type of bond which formed between positive and negative ions or metal, sodium and non-metal , chlorine  
It would form into NaCl because Na has a +1 charge while Cl has a -1 charge.

How much does a gold bar wiegh and how much is it wotrth

Answers

It depends on the gold bar.  Gold bars come in all diferent sizes.  However how much its worth depends on how big it is.  Gold is $1,320 per ounce.

What are the most chemically active metals located on the periodic table

Answers

The most chemically active metals are the alkali metals on the periodic table.

Which structures are found in both prokaryotic cells and eukaryotic cells?Choose all answers that are correct.







A.
cytoplasm





B.
flagella





C.
pili





D.
plasma membrane





E.
ribosomes

Answers

it is both D and E because both are found in most cells

24 POINTS!!!!!!!!!!!!!!!!!!Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her seatbelt stops her from flying forward, bringing her to rest in 0.5 seconds. How much force did the seatbelt put on Sarah?

Answers

F = (mass)(acceleration) = ma

m = 55 kg

Vi = 20 m/s

t = 0.5 s

Vf = 0 m/s (since she was put to rest)

a=(Vf-Vi)/t

a=(0-20)/5

a = 40 m/s^2 (decelerating)

F = ma = (55 kg)(40 m/s^2)

F = 2200 N

Hope this answer will be a good help for you.
 change of momentum =mv-mu=m(v-u)=55(0-20)=-1100
rate of change of momentum=-1100/0.5=-2200  this is equal to force applied.
so force=-2200 kg/m^2
negative sign shows force acts in opposite direction to motion.

Is boiling water a chemical reaction?

Answers

No boiling water is not a chemical change it would be a physical change
no it is a physical change
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