Question

Super hard questions impossibal!!!!!

You are asked to demonstrate that the volume of a gas expands when heated and contracts when cooled. You do an experiment using a balloon. First you inflate and tie off a balloon, then measure the circumference at room temperature. Then you put the balloon in a freezer for an hour, measure the circumference, and find that it has contracted. When you put the balloon in a warm room for a time, the balloon expands and the circumference increases. What is the independent variable in this experiment?

Answer 1

A.The balloon
B.The volume of air in the balloon
C.The temperature of the air in the balloon
D.The time of day the experiment is performed

Answer 2

you're right it's impossibal to solve.. jk it's the temperature of the balloon

independent = what you're changing

Answer 3

thanks help me with more please? @aaronq

Answer 4

sure

Answer 5

okay thanks @aaronq
Which of the following physical states has particles that vibrate in place and do not move past their neighbors?
A.Gas
B.liquid
C.molecule
D.solid

Answer 6

solids

Answer 7

good heres another! @aaronq

Students dropped different colored toothpicks in lawn grass. They were given one minute to pick up as many toothpicks as they could. Students found that they had more red and blue toothpicks than green. Ecologists observed that the Varying hares (rabbits) fur is brown in the summer and white in winter. They found that the population remained about the same in winter and summer. What advantage does the model presented in the classroom have over the natural setting?

A.It shows how easily people would find animals of different colors
B.It is more accurate because classroom models better represent nature than nature itself
C.It is easier to calculate the results because of the controlled environment
D.It bears no advantage over the natural testing environment

Answer 8

It is easier to calculate the results because of the controlled environment

Answer 9

Your smart haha good job @aaronq

Which is the best example of how science and improvements in technology affect life?
A.Some bacteria can cause life-threatening diseases in humans.
B.Human genetic material is inserted into bacteria to produce human insulin
C.A rabbit grows white fur in the winter for camouflage.
D.The wind blows wing-shaped seeds to more fertile soil.

Answer 10

haaha thanks

ps. you're = you are
your = possessive as in "your pen"


Human genetic material is inserted into bacteria to produce human insulin

Answer 11

oh ok haha thanks!

Bacteria reproduce asexually by dividing in two. If you were to examine the genetic material of two bacteria that had just been reproduced from the same parental cell, how would their genetic material compare? (Assume no mutations occur)
A. Completely Different
B. 65% the same
C. 50% the same
D. 100% the same

Answer 12

D. 100% the same

Answer 13

nice! @aaronq
Both parents of a Siamese cat have green eyes. Their offspring also have green eyes. This would be an example of
A. an acquired trait
B. an inherited trait
C. a learned trait
D. a found trait

Answer 14

@aaronq

Answer 15

B. an inherited trait because it's genetic

Answer 16

okay what about this one @aaronq

Which answer shows the following items in order from the highest density to the lowest density? *
water, atmosphere, core, crust
atmosphere, crust, core, water
crust, water, atmosphere, core
core, crust, water, atmosphere

Answer 17

core, crust, water, atmosphere

i think, i havent taken earth sciences in a long time

Answer 18

okay thats fine @aaronq

A rock and a lead weight both sink when dropped into a lake. What do you know about their densities? *
They have the same densities
They have different densities
They are denser than water
They are less dense than water

Answer 19

They are denser than water

Answer 20

A student was given an assignment to calculate the density of a rock. Which of the following would best describe one of the needed steps to calculating the rock's density? *
The student puts the rock in an empty graduated cylinder and records the measurement in milliliters
The student puts the rock in a graduated cylinder filled with water and records the volume of the rock
The student uses a thermometer to measure the temperature of the rock in Celsius degrees
The student measures the length of the rock in centimeters with a metric ruler

Answer 21

@aaronq

Answer 22

to find the density, \(\rho\), of anything you need both the volume and the mass of the object.

\(\rho=\dfrac{m}{V}\)

Answer 23

In winter, a layer of cold air settles in the valleys and warmer air is often found higher in the mountains. What might account for this condition? *
There is more warm air than cold air
There is more cold air than warm air
Cold air is less dense than warm air
Cold air is denser than warm air

Answer 24

Cold air is denser than warm air

Answer 25

A liquid is found to have a volume of 75 mL in a graduated cylinder. When placed on a balance, the liquid and graduated cylinder has a mass of 125 g. The empty graduated cylinder has a mass of 50 g. What is the density of the liquid? *
.1 g/mL
1 g/mL
2.2 g/mL
22 g/mL

Answer 26

use the formula \(\rho=\dfrac{m}{V}\)

Answer 27

so whats the answer?

Answer 28

you use the formula above and a calculator

Answer 29

i dont know how

Answer 30

whats the mass of the liquid?

Answer 31

idk?

Answer 32

if you have a cup with water and together they weigh 100g, but the cup weighs 50 g, whats the weight of the water?

Answer 33

idk im confused whats the answer?

Answer 34

if you're not going to try and im not going to help you

Answer 35

okay i answered it next one
Which of the following characteristics would be appropriately used in developing a classification key for birds? *
where the bird was seen
how plentiful that bird is in your neighborhood
what food the bird eats
color markings on the bird's head

Answer 36

idk

Answer 37

Which of the following is our most useful criterion to determine if two currently-living organisms or populations are of the same species? *
They interbreed and their offspring are sterile.
They interbreed and produce fertile offspring.
They interbreed and their offspring all die at birth.
Only the offspring of the two organisms can interbreed and produce offspring.

Answer 38

@aaronq

Answer 39

the first line answers it all: THE VOLUME OF A GAS EXPANDS WHEN HEAT IS BEING GIVEN..AND VOLUME OF GASES CONTRACTS WHEN IT IS BROUGHT DOWN TO A LOWER TEMPERATURE.which answers the variation of circumference of that baloon.