CHEMISTRY MIDDLE SCHOOL

Which type of change does not break or form bonds? A.physical B. Chemical change C. Nuclear change D. Molecular change

Answers

Answer 1
Answer: It is a physical change.
Answer 2
Answer: i think phyisical although i may be wrong

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PLEASE HURRY. Which of the molecules below is propyne?

Diagram how a solids molecular structure is different from a liquids molecular structure

Answers

Pretty much, for solids draw the molecules close together and rigid, for liquids, the molecules are spaced apart a little and not all lined up

Is an apple a pure substance or a mixture?

Answers

An apple would be a mixture. While a mixture is a combination of elements and substances, a pure substance acts as an element itself, therefore, having the properties of only THAT certain element. 
An apple is a mixture because a mixture has chemicals such as water, vitamins, sugar, and lots more.

Movement of molecules from an area of lower concentration to one of higher concentration with carrier molecules, using energy, is called ______________. A.
osmosis

B.
mitosis

C.
diffusion

D.
active transport

Answers

D. Active Transport is the answer

Give two examples in your everyday experience where diffusion occurs. Can you think of a situation of where this might be harmful?

Answers

The first example of diffusion is smoking a cigarette when u light it it spreads through the air. 
The second example is lighting a candle in a room it the smoke spreads through the air. 
Smoke can be very bad for the air and the people around because it can cause many problems with your breathing. 

What is the volume of 15.2 grams of SO2 at STP?

Answers

5.33 Liters is the volume of 15.2 grams of SO2 at STP.

Explanation:

If the mass of the gas, then you can divide the mass by the molecular weight of the gas molecules to get the number of moles. Then multiply this by 22.4 Liters / mole to get the volume.

PV = nRT => The Ideal Gas Law.

Each unit occurs three times and the cube root yields L-atm / mol-K, the correct units for R when used in a gas law context.

PV / nT = R. or  PV = nRT.

R is called the gas constant.

PV = nRT => V = nRT/P

n = moles SO₂ = 15.2g/64g·mol⁻¹ = 0.238 mole

R = Gas Constant = 0.08206 L·atm/mol·K

T = Kelvin Temp = 273K at STP

P = pressure in atmospheres = 1.0 atm at STP

∴ V = (0.238mol)(0.08206 L·atm/mol·K)(273K)/(1.0atm)

=> 5.33 Liters SO₂.

Which organism is an herbivore?A.
grass

B.
bacterium

C.
spider

D.
grasshopper

Answers

Herbivores eat plants (producers) grass is a producer, spiders eat meat from bugs (carnivore) bacteria is idk. The answer is grasshopper because they eat plants.
answer is d. a grasshopper
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