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anyanavicka [17]

2 years ago

11

How to measure with SI UNIT

1 answer:

nordsb [41]2 years ago

8 0

The SI base units and their physical quantities are the metre for measurement of length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the candela for luminous intensity, and the mole for amount of substance.

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Which of the following measurements is expressed to three significant figures?

Norma-Jean [14]

Answer:

D

Explanation:

it goes past the decimal three places

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Melting butter is a physical change. Which best describes what is happening?

vlabodo [156]

Melting butter is a physical change. The statement that best describes what is happening is that the butter contains a new arrangement of atoms.

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Where is the temperate zone? A close to the equator B along bodies of water C next to the North and South Poles D between the po

LenKa [72]

Answer:

I think A close to the equator

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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.

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Science Question 1: Please Answer!

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Ok but you have to give me a cookie

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