3 years ago

What is a substance made of 2 or more elements called

Chemistry

2 answers:

Wittaler [7]3 years ago

7 0

It’s called a compound

defon3 years ago

4 0

Answer:

A substance made from 2 or more elements is called a compound

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True or false transuranium elements are synthetic elements with atomic #’s of 93 or higher.

devlian [24]

It's absolutely TRUE...........

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3 years ago

Calculate the number of O atoms in 0.150 g of CaSO4 · 2H2O.

natulia [17]

Answer:

There are 0.00523 moles of oxygen in 0.150 grams of calcium sulfate crystal.

Explanation:

Mass of calcium sulfate crystal = m = 0.150 g

Molar mass of calcium sulfate crystal = M = 172 g/mol

Moles of magnesium nitrate = n

$n=\frac{m}{M}$

$n=\frac{0.150 g}{172 g/mol}=0.0008721 mol$

1 mole of calcium sulfate crystal has 6 moles of oxygen atoms. Then 0.004446 moles calcium sulfate crystal will have :

$6\times 0.0008721 mol=0.0052326mol\approx 0.00523 mol$

There are 0.00523 moles of oxygen in 0.150 grams of calcium sulfate crystal.

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3 years ago

On a heating curve, in which section(s) would you use the equation, Q=mCΔT, to calculate the total heat required?

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Answer:

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Heat of fusion (?Hfus) is used for calculations involving a phase change between solid and liquid, with no temperature change. F

Butoxors [25]

Answer:

q = 38,5 kJ

Explanation:

In its melting point, at 0°C, water is liquid. The boiling point of water is 100°C. It is possible to estimate the heat you required to raise the temperature of water from 0°C to 100°C using:

q = C×m×ΔT

Where C is specific heat of water (4,184J/g°C), m is mass of water (92,0g) and ΔT is change in temperature (100°C-0°C = 100°C)

Replacing:

q = 4,184J/g°C×92,0g×100°C

q = 38493 J, in kilojoules:

I hope it helps!

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Iron(II) sulfide has a molar mass of 87.91 g/mol. 50 grams of

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Answer:

true

Explanation:

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