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3 years ago

I need help with all of them.. please help..

Chemistry

1 answer:

Crazy boy [7]3 years ago

7 0

The answer is not the alphabet

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When copper metal is heated to 1100 oC it melts. Is this a chemical or physical change? Explain your answer

Pani-rosa [81]

Answer:

it is a physical change

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3 years ago

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What is 50 plus 50vhvvhygygyfyftftfffffffrdrdrdrdrdr?

jeka94

The answer would b 100<span>vhvvhygygyfyftftfffffffrdrdrdrdrdr</span>

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4 years ago

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You are given a solution of HCOOH (formic acid) with an approximate concentration of 0.20 M and you will titrate this with a 0.1

jeka57 [31]

Answer:

$\boxed{\text{36 mL}}$

Explanation:

1. Write the balanced chemical equation.

$\rm HCOOH + NaOH $ \longrightarrow$ HCOONa + H$_{2}$O$

2. Calculate the moles of HCOOH

$\text{Moles of HCOOH} =\text{20.00 mL HCOOH } \times \dfrac{\text{0.20 mmol HCOOHl}}{\text{1 mL HCOOH}} = \text{4.00 mmol HCOOH}$

3. Calculate the moles of NaOH.

$\text{Moles of NaOH = 4.00 mmol HCOOH } \times \dfrac{\text{1 mmol NaOH} }{\text{1 mmol HCOOH}} = \text{4.00 mmol NaOH}$

4. Calculate the volume of NaOH

$c = \text{4.00 mmol NaOH } \times \dfrac{\text{1 mL NaOH }}{\text{0.1105 mmol NaOH }} = \textbf{36 mL NaOH }\\\\\text{The titration will require }\boxed{\textbf{36 mL of NaOH}}$

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3 years ago

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). If you breathe 15 times a minute (at res

Misha Larkins [42]

Answer:

Explanation:

Given parameters:

Number of breathe per minute = 15times

Volume of air per breath = 0.5L

Percentage of oxygen in air = 21%

Solution

There are 24 hours in a day.

60minutes makes a hour in a day,

I will breathe:

15 times x 60 x 24 = 21600 times in a day

The volume of air I will take in per day:

A breathe = 0.5L of air

21600breathe = 0.5 x 21600 = 10800L of air

Volume of oxygen I will breathe per day:

$\frac{21}{100}$ x 10800 = 2268L of oxygen

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3 years ago

Witch compound has an element ratio of 2:1

rusak2 [61]

Answer:

Water

Explanation:

Because the ratio with which hydrogen and oxygen combine is 2:1. I.e for every molecule of water there will always be

two atoms of hydrogen combined with one atom of oxygen.

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3 years ago