What clues indicate a rusty bike has gone through a chemical change

Answers

Answer 1

Answer: That bike is certainly made of iron. And when iron comes in contact with oxygen, it rusts. Well, a chemical change occurs! It is rusty, the red marks clearly show that - so, this is the evidence that the bike has gone through a chemical change. There is plenty of oxygen in the air so the bike has to rust.

Answer 2

Answer: That the color isn't the same because it has rust, it will be now dark red or even green.

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What is the molarity of a solution that contains 12 moles of cacl2 in 3 liters of solution?

Answers

Molarity is defined as the number of moles of solute dissolved in a volume of 1 L.
the number of moles of CaCl₂ present - 12 mol
Volume of solution - 3 L
Therefore if 3 L contains 12 mol of CaCl₂
then 1 L of CaCl₂ contains - $(12 mol)/(3 L)$ = 4 mol/L
Therefore molarity of CaCl₂ is 4 M

The vapor pressure of a liquid is 0.92 atm at 60°C. The normal boiling point of the liquid could be(1) 35°C (3) 55°C(2) 45°C (4) 65°C

Answers

The answer is (4) 65°C. For this question, you need to know that the definition of boiling is when a liquid's vapor pressure equals atmospheric pressure. Normal boiling point just means boiling point at sea level, when atmospheric pressure is 1atm. For this particular liquid, you would need to raise the temperature a little for the vapor pressure to rise to 1atm (because vapor pressure increases with temperature). Therefore your temperature must be higher than 60°C, and the only such choice available to you is (4).

Answer:

4 ¥

TRUST REASON

The answer is 4 because when the vapor pressure is in liquid form, the boiling point would be the hottest point

How would the equilibrium change if NO2 were added to SO2(g) + NO2(g) NO(g) + SO3(g) + heat?A. The equilibrium constant would increase.
B. The amount of NO and SO3 would decrease.
C. The amount of NO and SO3 would increase.
D. The amount of NO2 and SO2 would increase.

Answers

The answer to this question would be that the amount of No and SO3 would increase. The correct choice is C.

The equilibrium of this chemical reaction would change if NO₂ were added because: C. the amount of NO and SO₃ would increase.

What is an equilibrium?

An equilibrium can be defined as a condition in which there is no net change in the amounts of both reactants and products with respect to time, during a reversible chemical reaction.

This ultimately implies that, the rate of the forwardchemical reaction is equal to the rate of the backwardchemical reaction at equilibrium.

In this context, we can infer and logically conclude that the equilibrium of this chemical reaction would change when NO₂ is added because the amount of NO and SO₃ would increase:

SO₂(g) + NO₂(g) ⇆ NO(g) + SO₃(g) + heat

Read more on equilibrium here: brainly.com/question/5081082

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Which solution has the lowest freezing point

Answers

bc KI has a lower freezing point than water. this means that the higher ratio of KI to water you have, the lower the freezing point will be. since 3 has the highest ratio of KI to water, it will have the lowest freezing point

Explain, in terms of both atoms and molecular structure, why there is no isomer of CH3OH.

Answers

Explain, in terms of both atoms and molecular structure, why there is no isomer of CH3OH.

There is no isomer of CH3OH or methanol because it contains only one carbon atom. And also, the structure is tetrahedral, having four substances attached to the carbon atom.

which of the molecules listed below directly donates a nitrogen atom for the formation of urea during the urea cycle?

Answers

Aspartate directly donates a nitrogen atom from the formation of urea during the urea cycle.
The argininosuccinate synthase reeaction links aspartate and citrulline via the amino group of aspartate and provides the second nitrogen of urea.

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