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3 years ago

12. Complete each of the following word equations for synthesis reactions.

Chemistry

1 answer:

Vlada [557]3 years ago

5 0

Explanation:

12)

a) Sodium + oxygen = ?

When sodium reacts oxygen its forms sodium oxide as a product.

$4Na(s)+O_2(g)\rightarrow 2Na_2O(s)$

b) magnesium + fluorine = ?

When magnesium reacts with fluorine its forms magnesium fluoride as a product.

$Mg(s)+F_2(g)\rightarrow MgF_2(s)$

13)

a) $2HgO(s)\overset{\Delta }\rightarrow 2Hg(l)+O_2(g)$

Decomposition of mercury(II) oxide on heating gives out mercury and oxygen gas.

b) $2H_2O(l)\overset{Electricity}\rightarrow 2H_2(g)+O_2(g)$

The electrolytic decomposition of water gives out hydrogen gas amd oxygen gas.

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C. physical

Explanation:

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3 years ago

A serving of Cheez-Its releases 1.30 x 10^4 kcal (1 kcal = 4.18 kJ) when digested by your body. If this same amount of energy we

kondor19780726 [428]

Answer:

The final temperature is:- 7428571463.57 °C

Explanation:

The expression for the calculation of heat is shown below as:-

$Q=m\times C\times \Delta T$

Where,

$Q$ is the heat absorbed/released

m is the mass

C is the specific heat capacity

$\Delta T$ is the temperature change

Thus, given that:-

Mass of water = 1.75 mg = 0.00175 g ( 1 g = 0.001 mg)

Specific heat of water = 4.18 J/g°C

Initial temperature = 35 °C

Final temperature = x °C

$\Delta T=(x-35)\ ^0C/tex]
Q = [tex]1.3\times 10^4$ kcal

Also, 1 kcal = 4.18 kJ = $4.18\times 10^3$ J

So, Q = $1.3\times 10^4\times 4.18\times 10^3$ J = 54340000 J

So,

$54340000=0.00175\times 4.18\times (x-35)$

$0.00175\times \:4.18\left(x-35\right)=54340000$

$x-35=\frac{54340000}{0.007315}$

$x=7428571463.57$

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