CHEMISTRY MIDDLE SCHOOL

How many molecules of isopently acetate C7H1402 are released (1x10^ -6g) in a typical bee sting

Answers

Answer 1

Answer:

The number of molecules of isopently acetate is 4.63 x 10¹⁵ molecules

calculation

Step 1: find the moles of isopently acetate( C₇H₁₄O₂)

moles = mass÷ molar mass

From periodic table the molar mass of C₇H₁₄O₂

= (12 x7 ) + (1 x14) +(16 x2) =130 g/mol

moles = 1 x10⁻⁶ g÷ 130 g/mol = 7 x 10⁻⁹ moles

step 2 ; use the Avogadro's law constant to calculate the number of molecules

That is according to Avogadro's law 1 mole = 6.02 x 10²³ molecules

7 x 10⁻⁹ moles = ? molecules

by cross multiplication

= { (7 x 10⁻⁹ moles x 6.02 x10²³ molecules) / 1 mole} = 4.63 x 10¹⁵ molecules

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Is ability to conduct heat, physical or chemical?

Answers

the ability to conduct heat is physical because the object doesn't need to change its state in any way for this test to be taken

Physical because it does not need to change its state

How many atoms are there in 5.7 mol of Li?

Answers

Answer:Answer:

5.8

, where

Avogadro's Number,

6.022

⋅

−

Explanation:

And

5.8

⋅

6.022

⋅

−

What is the mass of this quantity of lithium atoms? Hint, 1 mole has a mass of

6.94

⋅

Explanation:

i hope this helps

when an iron nail is placed in an aqueous solution of copper(ii)sulphate,a reaction take place.construct an ionic equation for reaction?

Answers

The net ionic equation for this reaction is $Fe(s) \ + \ Cu^(2+)(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ Cu(s)$ . In ionic equations the soluble compounds are written in their dissociated ion forms. The ionic equation can be determined by knowing the general solubility rules. In this problem there are sulfate compounds involved. It is important to know that sulfates are generally soluble except for sulfates of Ba, Pb, Ag, and Sr. Therefore, the ones dealt with in this problem, CuSO4 and FeSO4, are both soluble in water.

Further Explanation:

The complete equation for this reaction is:

$Fe(s) \ + \ CuSO_(4)(aq) \rightarrow \ FeSO_(4)(aq) \ + \ Cu(s)$

CuSO4 and FeSO4 are soluble in water which will lead to the ionic equation:

$Fe(s) \ + \ Cu^(2+)(aq) \ + \ SO_(4)^ {2-}(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ SO_(4)^(2-)(aq) \ + \ Cu(s)$

Since the sulfate ion appears on both sides, it is a spectator ion. Spectator ions are unchanged in the chemical reaction and are removed from the net ionic equation:

$\boxed {Fe(s) \ + \ Cu^(2+)(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ Cu(s)}$

Based on the net ionic equation it can be seen that this is a reduction-oxidation reaction. Iron was oxidized and copper was reduced.

Learn More

Learn more about solubility rules brainly.com/question/11617954
Learn more about redox reactions brainly.com/question/2388654
Learn more about chemical equations brainly.com/question/6976143

Keywords: ionic equation, solubility

In a chemical reaction, ... interact to form ... a. molecules, atoms
b. products, reactants
c. elements, atoms
d. reactants, products

Answers

The answer is letter D. Reactants, Products

You can put out a chip pan fire by putting a damp cloth over the pan. Explain why this works.

Answers

Placing a damp towel on the chip pan fire will stop the oxygen from getting to flames, so the fire will smother out.

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Answers

One example would be the dissolving of molecules with water so that they can be transported.

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