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3 years ago

Identify the principle or law that identifies the relative age of the intrusion compared to layer Q.

Chemistry

1 answer:

Darya [45]3 years ago

7 0

Answer:

The answer is C (law of superposition)

Explanation:

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How many valence electrons do the alkaline earth metals have?

fenix001 [56]

Answer:

$\boxed{2}$

Explanation:

Alkaline earth metals are in group 2. The number of valence electrons of elements in group 2 is 2.

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3 years ago

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What is the solubility of Na2HAsO4 at 60 degrees C

nlexa [21]

C. 65g / 100ml of water

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3 years ago

A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. the total heat capacity of the calorimeter plus water w

Sladkaya [172]

Answer: Th enthalpy of combustion for the given reaction is 594.244 kJ/mol

Explanation: Enthalpy of combustion is defined as the decomposition of a substance in the presence of oxygen gas.

W are given a chemical reaction:

$Mg(s)+\frac{1}{2}O_2(g)\rightarrow MgO(s)$

$c=5760J/^oC$

$\Delta T=0.570^oC$

To calculate the enthalpy change, we use the formula:

$\Delta H=c\Delta T\\\\\Delta H=5760J/^oC\times 0.570^oC=3283.2J$

This is the amount of energy released when 0.1326 grams of sample was burned.

So, energy released when 1 gram of sample was burned is = $\frac{3283.2J}{0.1326g}=24760.181J/g$

Energy 1 mole of magnesium is being combusted, so to calculate the energy released when 1 mole of magnesium ( that is 24 g/mol of magnesium) is being combusted will be:

$\Delta H=24760.181J/g\times 24g/mol\\\\\Delta H=594244.3J/mol\\\\\Delta H=594.244kJ/mol$

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3 years ago

an, 13 Students set up two environments see which one best supports growth of hibiscus flowers. One environment is created as a

Assoli18 [71]

B. The Enviroment. The Soil and Humidity are differant. They both have high tematures, they use the same flowers in both, Hibiscus. The tropical environent should help the Hiviscus grow better.

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3 years ago

How is the pH of an acidic substance raised?

BabaBlast [244]

Answer: 4) Concentrate it

Explanation:

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2 years ago