What happens when a pure substance undergoes a chemical change

Answers

Answer 1

Answer:

When a pure substance undergoes chemical change, the pure substance changes in chemical composition.

What is a chemical change?

Chemical change is any change that involves the formation of new substances or products and it is not easily reversible.

A pure substance is any substance that has a definite chemical composition.

However, when a pure substance undergoes chemical change, the chemical composition of the substance is changed to form new products.

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Answer 2

Answer: The substance changes completely. It undergoes a chemical reaction.

Example is when you bake a cake. You cannot bring it bake to dough.

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What do you make when you hit a rock with a hammer

Answers

You create sound waves and moment from the rock and hammer.

Explain why burning is a chemical change in wood

Answers

The carbon element in wood reacts to the oxygen so it creates, energy as we all know as light and heat, ashes, and smoke. Hope this helps!

It is a chemical change in wood because a chemical change is when some object is being changed. So when fire burns on wood it changes how the wood is. The wood goes from whole to ash dust. Hope I could help. ;-)

what might happen in a tropical rainforest biome if the area received very little rain for an extended period of time

Answers

plants and animals would die

Answer:

The forest will become very dry and things that need water will die

Which statement best explains the symbol [NaCl]? moles of water per liter of NaCl moles of water per liter of solution moles of NaCl per liter of solution moles of NaCl per liter of water

Answers

Answer:

moles of NaCl per liter of solution.

Explanation:

[NaCl] is an expression of the concentration of NaCl.

If the concentration is the molarity;

Molarity can be defined as the no. of moles of solute dissolved per a 1.0 L of the solution.

For [NaCl] is a symbol for: moles of NaCl per liter of solution.

Answer: moles of $NaCl$ per liter of solution

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

$Molarity=(n)/(V_s)$

where,

n= moles of solute

$V_s$ = volume of solution in L

Square brackets represents the concentration of a substance i.e. amount of solute dissolved per liter of the solution.

Thus $NaCl$ represents moles of $NaCl$ per liter of solution.

Which formula represents an organic compound?( l) CaH2 (3) H2O2

(2) C4H8 (4) P2O5

Answers

Answer: The correct answer is Option 2.

Explanation:

Organic compounds are defined as those compounds in which a covalent bond is present between hydrogen and carbon atom. They are basically known as hydrocarbons. If any atom other than hydrogen and carbon is present, it is not considered as an organic compound.

From the given options:

Option 1: $CaH_2$

A, calcium atom is present, so it is not considered as an organic compound.

Option 2: $C_4H_8$

As., only carbon and hydrogen atom is only present, so it is considered as an organic compound.

Option 3: $H_2O_2$

As, oxygen atom is present, so it is not considered as an organic compound.

Option 4: $P_2O_5$

As, phosphorous and oxygen atoms are present, so it is not considered as an organic compound.

From the above information, the correct answer is Option 2.

The formula (2) $C_4H_8$ represents an organic compound.

What is an Organic compound

Organic compounds are compounds that primarily consist of carbon (C) and hydrogen (H), along with other elements such as oxygen, nitrogen, sulfur, and others. The formula $C_4H_8$ represents an organic compound that contains four carbon atoms (C₄) and eight hydrogen atoms (H₈).

These examples represent a small fraction of the vast array of organic compounds found in nature and synthesized in laboratories.

Hence we can say that option 2 is right. $C_4H_8$ represents an organic compound.

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Help please number 7 and 8 the

Answers

Answer:

Rover has wheels

Orbiter has neither

You need to pack all of your supplies up tightly. You need to bring a bunch of food in packages.

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