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Wittaler [7]
3 years ago
8

In which type of chemical reaction do two or more substances combine to form one substance?

Chemistry
2 answers:
Stella [2.4K]3 years ago
7 0
A) synthesis reaction
sveticcg [70]3 years ago
6 0
Your answer should be a
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How much energy (kJ) is required to change 0.18 mole of ice (s) at 0 C to water (l) at 0 C?
Dmitriy789 [7]

Answer:25,06 kJ of energy must be added to a 75 g block of ice.

ΔHfusion(H₂O) = 6,01 kJ/mol.

T(H₂O) = 0°C.

m(H₂O) = 75 g.

n(H₂O) = m(H₂O) ÷ M(H₂O).

n(H₂O) = 75 g ÷ 18 g/mol.

n(H₂O) = 4,17 mol.

Q = ΔHfusion(H₂O) · n(H₂O)

Q = 6,01 kJ/mol · 4,17 mol

Q = 25,06 kJ.

Explanation:

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2 years ago
If you wanted to make a crucible for melting sodium (Na), which metal would be most suitable for that purpose
Andreyy89
Calcium would be best suitable
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3 years ago
Where would sound travel the slowest
viva [34]

Answer:

Wood

Explanation:

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3 years ago
A 0.250 g sample of hydrocarbon (containing only carbon and hydrogen) undergoes complete combustion to produce 0.845 g of CO2 an
melomori [17]

Answer:

CH

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We have to obtain the mass of carbon and hydrogen in CO2 and H2O respectively.

For carbon in CO2;

0.845 * 12/44 = 0.23 g

For hydrogen in H20;

0.173 * 2/18 = 0.019 g

We convert the masses to moles of carbon and hydrogen

For carbon - 0.23/ 12 = 0.019 moles

For hydrogen - 0.019/1 = 0.019 moles

Dividing by 0.019 moles for carbon and hydrogen we have the emperical formula of the compound as CH

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Explain why a coin is able to float on top of water in a glass.
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3 years ago
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