3 years ago

LC Chemistry I v18 (GS) / Module 01: Matter

1 answer:

3 0

Answer:

Burning Paper

Explanation:

Burning Paper is an example of a chemical change because;

- A new substance called ''Ash'' is formed.

- It is an irreversible reaction.

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stepladder [879]

1692.9 is the answer

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3 years ago

xenn [34]

Answer : The formula unit of Sr & Cl is $SrCl_2$ and the formula unit of Al & S is $Al_2S_3$

Explanation :

Formula unit : it is defined as the lowest number ratio of ions of an elements in an ionic compound or covalent compound.

For the formula unit of Sr & Cl, two chloride ions $(Cl^-)$ are needed to neutralize the one strontium ion $(Sr^{2+})$ .

For the formula unit of Al & S, three sulfide ions $(S^{2-})$ are needed to neutralize the two aluminium ion $(Al^{3+})$ .

The formula unit of $SrCl_2$ and $Al_2S_3$ are shown below.

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3 years ago

Cloud [144]

I believe it was decomposition reaction

7 0

3 years ago

Brut [27]

D is a solid because it retains its shape

7 0

3 years ago

Tomtit [17]

<h2>Answer:</h2>

The option B is correct option. Which is release of heat and/or light energy .

<h3>Explanation:</h3>

According to the definition of exothermic reaction :

<em>An exothermic reaction is a chemical reaction that releases energy by light or heat.</em>

From definition option B (release of heat and/or light energy) indicates that an exothermic reaction has taken place.

4 0

3 years ago