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2 years ago

PLS HELP ME ASAP!!!!!

Chemistry

1 answer:

vichka [17]2 years ago

7 0

Independent variable- Sally's hair

Dependent variable- The shininess of Sally's hair

Control- The Shampoo

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Coke is an impure form of carbon that is often used in the in- dustrial production of metals from their oxides. If a sample of c

steposvetlana [31]

Answer:

The mass of coke needed to react completely with 1.0 ton of copper(II) oxide is 0.794 Ton.

Explanation:

$2CuO+C\rightarrow 2Cu+CO_2$

1 Ton = 907185 grams

Mass of copper oxide = 1.0 Ton = 907185 grams

Moles of copper oxide = $\frac{907185 g}{79.55 g/mol}=11,403.95 moles$

According to reaction, 2 moles of copper oxide reacts with 1 mole of carbon.

Then 11403.95 moles of copper oxide will react with:

$\frac{1}{2}\times 11403.95 mol=5,701.98 mol$ of carbon

Mass of 5,701.98 moles of carbon:

$5,701.98 mol\times 12 g/mol=68,423.75 g$

Mass of coke = x

Mass of carbon = 68,423.75 g

Percentage of carbon in coke = 95%

$95\%=\frac{68,423.75 g}{x}\times 100$

$x=720,250.09 g=0.794 Ton$

The mass of coke needed to react completely with 1.0 ton of copper(II) oxide is 0.794 Ton.

3 0

3 years ago

Can pure substances made from compounds be physically separated?

Arisa [49]

Answer:

it cannot !!

Explanation:

a chemical reaction MUST occur to separate a compound! :)

4 0

2 years ago

Molecule A is a __________. Bonding of fatty acids and polar phosphate groups to glycerol. Molecule A is a __________. Bonding o

Elena L [17]

Answer:

The correct option is: c. phospholipid

Explanation:

Phospholipids, also known as glycerophospholipids, are the derivatives of fatty acids which is a major structural component of the cell membranes.

Phospholipid is the class of lipids that is composed of a glycerol molecule that forms ester bonds with the two long-chain fatty acids and one phosphate group.

Therefore, Molecule A is a phospholipid.

7 0

2 years ago

Select the term that best completes the following statement:

ankoles [38]

Answer:

C. oxygen atom

Explanation:

H2O contains two hydrogen atoms and one oxygen atom.

3 0

3 years ago

What is the mass of an object with a density of 3.4 g/mL and a volume of 500.0 mL