CHEMISTRY HIGH SCHOOL

Which statement describes a physical property of copper?It reacts with strong acids.
It can be reshaped by a force.
It ignites at high temperatures.
It can combine with oxygen.

Answers

Answer 1
Answer:

Answer is: It can be reshaped by a force.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change, changing the shape is physical change.

Copper reaction with acid, ignition and combination with oxygen are chemical change (chemical reaction), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.
Answer 2
Answer: The correct answer is It can be reshaped by a force

That is because physical properties are ones that don't change the substance when it is physically altered. If copper is physically changed, none of its other chemical properties are influenced.

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A solution with a ph of 11 is first tested with phenolpthalein

Answers

A solution with a ph of 11 is first tested with phenolpthalein. The phenolphthalein indicator will turn pink because a phenolphthalein indicator only reacts with basic solutions.

What is observed when an iron bar is dipped into a solution of silver nitrate​

Answers

Answer:

I think it will start to have a greenish color and get lighter

Explanation:

10) which of the following compounds is a saturated hydrocarbon? A) CH3CH2OH B) CH CH C) ethyne CO CH3CHO 1) which compound is an unsaturated hydrocarbon? CA hexane B) hexanoic acid henne D) ethane. D) CH CH

Answers

The compound that is a saturated hydrocarbon is CH3CH2OH. The answer is letter A. A saturated hydrocarbon has only one single bond between the carbon atoms. The compound that is an unsaturated hydrocarbon is CHCH. The answer is letter D.

Which best describes a chain reaction associated with a nuclear reaction? Neutrons released during a fusion reaction cause other nuclei to fuse. Neutrons released during a fission reaction cause other nuclei to split. Helium nuclei released during a fission reaction cause other nuclei to split. Helium nuclei released during a fusion reaction cause other nuclei to fuse.

Answers

The statement that describes a chain reaction brought about by a nuclear reaction is "neutrons released during a fission reaction cause other nuclei to split." This is applicable to fission reactions only wherein atoms split and produce neutrons that also cause further atoms to split, thus creating a chain or series of reactions.

Answer:

B

Explanation:

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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How many thorium atoms would have to be lined up side by side to span 1.80 mm ?

Answers

To calculate how many thorium atoms would have to be lined up side by side to span 1.80 mm, you can use the following steps:

1. Find the atomic radius of thorium (Th). The atomic radius of thorium is approximately 180 picometers (pm), which is 180 x 10^-12 meters.

2. Convert 1.80 mm to meters. There are 1,000,000 picometers in a millimeter, so 1.80 mm is equivalent to 1.80 x 10^-3 meters.

3. Divide the length you want to span (1.80 x 10^-3 meters) by the atomic radius of thorium (180 x 10^-12 meters):

(1.80 x 10^-3 meters) / (180 x 10^-12 meters) = 10,000,000

So, you would need to line up approximately 10,000,000 thorium atoms side by side to span 1.80 mm.
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