CHEMISTRY MIDDLE SCHOOL

During natural selection, which organisms are most likely to survive as the environment changes?​

Answers

Answer 1
Answer:

Are there any choices to your question? If so what are they? Then I can answer. :)

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Which particle of the atom has no charge? A.
nucleus

B.
electron

C.
neutron

D.
proton

Answers

C, the neutron is the answer!
C. Neutron

Has no charge.

Which law is associated with inertia

Answers

Newton's first law is the answer.

If 6.5 mol NO2 react with 1.0 mol H20, how many moles of the excess reactantremains when the reaction is complete? 3NO2 + H2O + NO + 2HNO3

1.5 mol H20
2.5 mol H20
O 3.5 mol NO2
O 1.0 mol NO2

Answers

Answer:

3.5 moles of NO2.

Explanation:

The balanced equation for the reaction is given below:

3NO2 + H2O —> NO + 2HNO3

Next, we shall determine the excess reactant. This is illustrated below:

From the balanced equation above,

3 moles of NO2 reacted with 1 moles H2O.

Therefore, 6.5 moles of NO2 will react with = (6.5 x 1)/3 = 2.17 moles of H2O.

From the above calculations, we can see that it will take a higher amount i.e 2.17 moles than what was given i.e 1 mole of H2O to react completely with 6.5 moles of NO2.

Therefore, NO2 is the excess reactant and H2O is the limiting reactant.

Next, we shall determine the number of mole of the excess reactant that reacted in the reaction. This is illustrated below:

From the balanced equation above, we can see that 3 moles of NO2 reacted with 1 mole of H2O.

Finally, we shall determine the leftover mole of the excess reactant after the reaction. This is illustrated below:

Given mole of NO2 = 6.5 moles

Reacted mole of NO2 = 3 moles

Leftover mole of NO2 =...?

Leftover mole = Given mole – Reacted mole

Leftover mole of NO2 = 6.5 – 3

Leftover mole of NO2 = 3.5 moles.

Therefore, 3.5 moles of NO2 remained after the reaction.

the particles that make up a rock are constantly moving. however, a rock does not visibly vibrate. why is this?

Answers

Only the particles inside the rock/solid are moving, not the actual rock. 
It is due to a low entropy level in the rock, and also the type of chemical bonds the rock has. 
An example similar to this  one would be diamond. It is made up of carbon bonds. But once you take a (real) diamond out of the ground, it very slowly, not visible to the human eye, yet surely is turning back into graphite. (another substance made by carbon bonds)
i hope this helped.

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.

What is the difference between conduction and convection?

Answers

These are both ways heat travel. Conduction is when something is touching something i.e. When you touch a hot pan. Convection is heat rising, then cooling so it sinks and heats back up and rises again repetitively i.e. A convection oven (think circulation of heat)
CONVECTION is the transfer of heat from high temperature to low temperature with movement of mass or medium due to temperature difference in the region. Although, convection is a bit similar to conduction, but convection involves movement of substances. Such as wind system in our planet. Air moves due to temperature difference in every part of our planet. Then, CONDUCTION is the transfer of heat, of course from high temperature to low temperature when two objects (such as metals) are in direct contact (without the movement of metals).
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