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3 years ago

Which of the following is not an example of a pure element?

2 answers:

8 0

Copper wire is not an example of a pure element because although it's made by pure elements, it's not one itself. It's made by factories.

Have a nice day! :)

Pavlova-9 [17]3 years ago

8 0

B) O2

hopefully that helps lol if u have any more questions like that do be afaid to ask me

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Which expression is equivalent to 6m + (m - 2)(m + 7) + 3?

dedylja [7]

It’s is m2 +11m-11
I believe that’s right

8 0

2 years ago

18. Use the activity series to predict whether the following synthesis reaction will occur. Write the chemical equations for the

MAXImum [283]

Answer: The chemical reaction for the synthesis reaction is given below.

Explanation:

Synthesis reaction is defined as a chemical reaction in which two small chemical substances combine together to form a single compound. The general equation for this chemical reaction follows:

$A+B\rightarrow AB$

For the reaction of calcium and oxygen combining together to form calcium oxide, the equation follows:

$2Ca(s)+O_2(g)\rightarrow 2CaO(s)$

By Stoichiometry,

2 moles of calcium element combines together with 1 mole of oxygen gas to produce 2 moles of calcium oxide.

Hence, the chemical equation for the reaction is given above.

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2 years ago

HELP PLS !!!! :))Formula unit of Sr and CI Formula unit of AI and S

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.

4 0

2 years ago

5250000 determine the number of significant figures

Shtirlitz [24]

Answer:

3 significant figures

7 0

2 years ago

When she dropped a rock into a graduated cylinder of water, Veronica noticed it sank to the bottom. She decided to investigate w

Romashka [77]

A is correct. water is incompressible, so it will always have the same density, regardless of volume

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2 years ago

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