3 years ago

Help please all please

Chemistry

2 answers:

Luden [163]3 years ago

5 0

Answer:

I don’t want to download a pdf that I don’t know what it is…

Also, brainly strictly says that we can’t post questions about a test or quiz that is found in school…

Explanation:

Lilit [14]3 years ago

3 0

Answer:

wnich subject and which class pdf i will help you tell me

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A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of a(n):

yaroslaw [1]

Answer: B) combustion reaction.

Explanation:

A) acid-base reaction: When an acid reacts with a base, to form metal salt and water, this type of reaction is Acid Base reaction.

Example: $HCl+NaOH\rightarrow NaCl+H_2O$

B) combustion reaction: When a hydrocarbon reacts with oxygen to produce carbon dioxide and water, this type of reaction is combustion reaction.

$CH_4+2O_2\rightarrow CO_2+2H_2O$

C) precipitation reaction: a reaction in which aqueous solution of two compounds on mixing react to form an insoluble compound which separate out as a solid are called precipitation reactions.

$Na_2SO_4(aq)+BaCl_2(aq)\rightarrow BaSO_4(s)+NaCl(aq)$

D) gas evolution reaction: a reaction in which one of the product is formed as a gas.

$CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

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3 years ago

the figure shows particles of a substance in a closed container. Which state of matter is shown in the figure?

FromTheMoon [43]

I don’t know not really sure just need the point sorry

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3 years ago

What is the pressure of nitrogen in atmospheres of a sample that is at 745 mmHg?

Semenov [28]

<span>The pressure of nitrogen in atmospheres of a sample that is at 745 mmHg- n2= .780 atm because 78 (from the 78%) 78/100=0.78.</span>

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3 years ago

A cubic meter is about the same as the volume occupied by a _____. basketball arena kilogram of water washing machine cup of mil

Zinaida [17]

washing machine, hopefully this helps

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3 years ago

There are many compounds that contribute to the overall aroma of a banana. The primary compound is called isoamyl acetate and co

Murljashka [212]

Explanation:

Let the mass of isoamyl acetate be 100g.

Moles of Carbon = 60.58/12 = 5.048mol

Moles of Hydrogen = 7.07/1 = 7.07mol

Moles of Oxygen = 32.28/16 = 2.018mol

Mole Ratio of C : H : O

= 5.048 : 7.07 : 2.018

= 5 : 7 : 2.

Hence the empirical formula of isoamyl acetate is C5H7O2.

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2 years ago