Question

#1: Which of the following is the best example of a valid hypothesis?

A. Children like brand X peanut butter better than brand Y peanut butter.

B. If I add substance X, then it will lower the temperature at which water freezes.

C. People should eat vegetables.

D. Bananas are better for you than chocolate.

***My answer: B
is that right??

Answer 1

#2: Kobe is testing whether 100 g of substance A, 100 g of substance B, or 100 g of substance C produces more oxygen in a chemical reaction at 25°C. What is the independent variable?

A. the masses of the substances

B. the temperature of the substances

C. the amount of oxygen produced

D. the nature of the substances
***My answer: D
is that right?? :)

Answer 2

oh and #3:

A chemist measures the amount of mercury in sediment samples from three areas of a river (the source, the midway point, and the mouth). Which of the following is the most reasonable hypothesis for the chemist's experiment?

A. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the source and lowest at the mouth.

B. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the mouth and lowest at the midway point.

C. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the mouth and lowest at the source.

D. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be the same all along the river.

***My answer: A
is this one correct as well?? =)

Answer 3

thanks for coming!! DO y'all understand these?? :D

Answer 4

#1 is correct - a hypotheis is an educated guess which must be testable using experiments

Answer 5

and sorry i posted 3 problems at once :) what do yal think? do the answers i put seem corret?

Answer 6

yay!! :D so i got #1 right :) what about #2 and #3?? :D

Answer 7

do y'all understand #2 and #3??? :) @phi @sauravshakya @ganeshie8 ?? :D

Answer 8

ha

Answer 9

lol :P

Answer 10

#2, mass and temperature are controlled variables, oxygen is obvious its the dependent variable, and that leaves only D.. you're correct again !

Answer 11

#2 also looks correct.

Answer 12

yes!! :D and is #3 correct also then??? :D

Answer 13

Looks good to me.

Answer 14

to me two

Answer 15

good work ! looks you've mastered the scientific method ;p

Answer 16

yayy :) thank youuu!! :D really appreciate the help!! @sauravshakya can u pls give @ganeshie8 a medal too? i can only give one :(

Answer 17

Already given.

Answer 18

so .. you just starting chemistry ha ?

Answer 19

oh okay awesome! haha

Answer 20

yeah i am lol and i wans't 100% sure on these so yeah

Answer 21

so yeah :) thanks again y'all!! byee :D

Answer 22

np :)