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IgorC [24]
4 years ago
12

Which best describes the difference between a physical change and a chemical change?

Chemistry
1 answer:
Wewaii [24]4 years ago
5 0

Answer:

  •   The correct answer is B.

A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

<u><em>Physical properties:</em></u>

Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.

<u><em>Example. </em></u>

Water when freezes into ice, it is physical change, just state is change.

<em><u>Chemical properties:</u></em>

The chemical properties depend upon composition.

<u>Example:</u>

Formation of precipitates is an example of chemical change.

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Examine the equation.
Alisiya [41]

Explanation:

The reaction expression is given as;

                 2H₂_{g}   +  O₂_{g}   →   2H₂O_{l}

From the balance reaction expression:

 2 mole of hydrogen gas combines with 1 mole of oxygen gas on the reactant side;

This produces 2 mole of water on the product side of the expression.

The product is in liquid form.

 This reaction is a synthesis reaction because a single product is formed from two reactants.

5 0
3 years ago
Pak Dollah who is long-sighted forgot to bring his glasses during breakfast in a restaurant. You are required to invent a lens t
Andre45 [30]

A converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

<h3>What is long-sightedness?</h3>

Long-sightedness is an eye effect in which objects are not able to focus on the retina but behind the retina, therefore, near objects are not clearly seen except they are placed far away.

To correct long-sightedness, a suitable converging lens is used to bring the image to focus on the retina.

To construct a converging lens for Pak Dollah, the transparent plastic bottle is filled with water to serve as a converging lens and Pal Dollah will read through it.

Therefore, a converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

Learn more about long-sightedness at:brainly.com/question/4419161

3 0
2 years ago
Consider the E2 elimination of 3‑bromopentane with hydroxide. The starting material consists of a chiral carbon with an in plane
Tanzania [10]

Answer:

Scheme is attached

Explanation:

When 3‑bromopentane reacts with hydroxide, (Z)-pent-2-ene will produce through E 2 (Z)-pent-2-ene.

Mechanism

Hydroxide ion (OH⁻ ) is a strong nucleophile so it abstract the proton from carbon next to the carbon attached with bromine.

The the carbon next to carbon of bromine gets -ve charge, mean while it shares its electrons with the carbon having bromine and make a double bond.

As bromine  is a good leaving group so it easily gets detached from carbon, so that carbon comes to its normal state.

As a result (Z)-pent-2-ene will produce. we call it Z because mostly trans products will form.

7 0
3 years ago
Explain how thermal energy affects particle movement.
makkiz [27]

Answer: When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases.

8 0
4 years ago
How many countries does Sahara desert touch and there names? ​
Anon25 [30]

Answer:

Morocco, Wester Sahara, Algeria, Mauritania, Mali, Libya, Niger, Chad , Sudan, Egypt,

8 0
3 years ago
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