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3 years ago

Which describes the letter that belongs where the question mark is?

Chemistry

2 answers:

Evgesh-ka [11]3 years ago

4 0

Explanation:

Are you referring to a variable?

Fofino [41]3 years ago

3 0

Dbdndnnddnbdbdbbdbnddnjssnsbsnksnd

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Convert 3828 ml to L

crimeas [40]

Answer:

divide the volume value by 1000

So 3828/1000=3.828

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3 years ago

A pharmacist wishes to strengthen a mixture from 10%alcohol to 30% alcohol. How much pure alcohol should be added to 7 liters of

Tomtit [17]

Answer:

2 litres of pure alcohol will be added to make the overall concentration of 9 litres of mixture as 30%.

Explanation:

Suppose x is the number of litres added to the 10% mixture than the quantity of new mixture is given as below

$n_{old}=7$ litres
$n_{new}=7+x$ litres

Also the quantity of alcohol is given as

$q_{old}=10 \% \, of \, 7 \, litres =0.7$

$q_{added}=x$

$q_{new}= 30 \% \,of \,new\, quantity = 0.3(7+x)$

Now the equation is as

$q_{old}+q_{added}=q_{new}\\0.7+x=0.3(7+x)\\0.7+x=2.1+0.3x\\x-0.3x=2.1-0.7\\0.7x=1.4\\x=2 \, litres$

So 2 litres of pure alcohol will be added to make the overall concentration of 9 litres of mixture as 30%.

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3 years ago

What is the balenced equation of Cu+H2SO4---> CuSO4+H2O+SO2

algol [13]

Balanced chemical equation :

1 Cu + 2 H2SO4 = 1 CuSO4 + 2 H2O + 1 SO<span>2</span>

hope this helps!.

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3 years ago

I need help with both questions

a_sh-v [17]

Answer:

not sure about 6 but 7 should be c

Explanation:

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3 years ago

Hexane and Butane are alkanes. Describe the structure of alkanes

dem82 [27]

Alkanes do not have a double bond, thus they are saturated. This makes them the simplest form of hydrocarbon, containing only hydrogen and carbon atoms. They are not very reactive as they don't have a double bond which can open up and join on to other molecules.

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3 years ago

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