CHEMISTRY HIGH SCHOOL

16 Which change results in the formation of different substances?(1) burning of propane(2) melting of NaCl (s)
(3) deposition of CO2(g)
(4) solidification of water

Answers

Answer 1
Answer:

Answer:The correct answer is option (1).

Explanation:

Burning of propane in the presence of oxygen will form carbon-dioxide, water and heat.The chemical reaction can represented as in chemical equation:

C_3H_8+5O_2\rightarrow 3CO_2+4H_2O+heat

This is an example of chemical change where new product is formed.

Where as in melting of sold sodium chloride, deposition of carbon-dioxide gas and solidification of water ;phase of the substance is changing that is a physical change is taking place.

Hence, the correct option is (1).
Answer 2
Answer: 1. The burning of propane creates different substances: propane and oxygen combine to create water and carbon dioxide:

C3H8 + 5 O2 becomes 3 CO2 + 4 H2O + heat

2. When NaCl melts, it is changing state, but it is still the same NaCl.

3. When gaseous CO2 deposits it is changing state, but it is still the same CO2.

4. When (presumably liquid) water solidifies, it is changing state, but it is still the same water.

So the answer is 1.

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Based on the equation below, which of the following statements best describes what should be observed as the reaction takes place?Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)

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a. Chlorine forming a solid precipitate
b. Bubbles forming from hydrogen gas production
c. Solid zinc dissolving
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Answers

The answer is. C, solid zinc dissolving.

According to the cell theory, which of the following is NOT composed of cells?a- algae
b-iron
c- bacteria

Answers

Answer:

Iron

Explanation:

cause i am big brain

When astronomers observe distant galaxies, they can tell the most of them are moving away from one another. In addition, the more distant the galaxies, the more rapidly they are likely to be moving away from each other. Can you devise a hypothesis to explain these observation?

Answers

It could be because something much larger that we have yet to discover is pulling objects to it like a black hole of something else that we can't see with the human eye.

Final answer:

An appropriate hypothesis explaining the observation of distant galaxies moving away from each other, and that they do so more rapidly the further they are can be found in the Big Bang Theory. This theory suggests our universe began with a 'big bang' causing galaxies to move away from each other, a process which continues today.

Explanation:

Based on the observations mentioned, an appropriate hypothesis might involve the Big Bang Theory. This theory in physics and astronomy assumes that our universe started from a singularity - a very high-density and high-temperature state. The Big Bang Theory suggests that after the initial explosion, the galaxies began moving away from each other, a process which continues till today.

The farther a galaxy is from us, the faster it's receding, which is known as Hubble's Law. This observed phenomenon matches with the theory's premise, providing validating evidence for the Big Bang.

Learn more about Big Bang Theory here:

brainly.com/question/30671260

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In a pressure cooker, a lid is screwed tightly onto a pot so that the air pressure in the pot is increased. What effect, if any, will this have on the boiling point of water in the pot?The boiling point will be raised.
The boiling point will be lowered.
The boiling point will be unaffected.
None of the above.

Answers

A liquid boils when it's vapor pressure will be equal to the atmospheric pressure. With the lid on, increases the pressure inside the pot. As an effect, it would take a higher temperature to reach the boiling temperature. 

Answer: The boiling point will be raised. 
If a lid is screwed on tightly in a pressure cooker, the air pressure is increased. This will make the boiling point of the water to be raised. 

How does a warm front form

Answers

A warm front occurs when a cold air mass retreats and is replaced by a warm air mass

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Answers

The two reasons why the UK government is encouraging citizens to recycle iron and steel is:
1.   The environment. Every machinery and device the industries makes which includes, infrastructures, mega structures to micro devices. Iron and steel is used. Reducing the extraction of ore and creating steel saves the environment, reduces mining.
2.   Economic reasons. When the ore mining and steel making is reduced in activity, the government won’t just be able to save the environment but it also save funds for other purposes.



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