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3 years ago

Which scientist was first to extensively develop the theory of continental drift?

Chemistry

2 answers:

fiasKO [112]3 years ago

7 0

Answer:

Alfred Wegener

Explanation:

K12

Simora [160]3 years ago

4 0

A. Alfred Wegener

hope that helps you :) ✨

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When 1.04g of cyclopropane was burnt in excess oxygen in a bomb calorimeter, the temperature rose by 3.69K. The total heat capac

STatiana [176]

Answer:

$\Delta _{comb}H=-2,093\frac{kJ}{mol}$

Explanation:

Hello!

In this case, since these calorimetry problems are characterized by the fact that the calorimeter absorbs the heat released by the combustion of the substance, we can write:

$Q_{rxn}+Q_{cal}=0$

Thus, given the temperature change and the total heat capacity, we obtain the following total heat of reaction:

$Q_{rxn}=-14.01kJ/K*3.69K\\\\Q_{rxn}=-51.70kJ$

Now, by dividing by the moles in 1.04 g of cyclopropane (42.09 g/mol) we obtain the enthalpy of combustion of this fuel:

$n=\frac{1.04g}{42.09g/mol}=0.0247mol\\\\\Delta _{comb}H=\frac{Q_{rxn}}{n}\\\\ \Delta _{comb}H=-2,093\frac{kJ}{mol}$

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4 0

2 years ago

What is a reaction called that has heat as a product (gives off heat)?

alex41 [277]

I believe the answer is Exothermic

8 0

3 years ago

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FAST I NEED THIS TO STUDY MY QUIZ IS TOMORROW!!!!

Elena L [17]

Answer:

The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number has the symbol Z.

Explanation:

make me as brain liest

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3 years ago

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A compound contains potassium, nitrogen, and oxygen. the experimental analysis gave values of 45.942 % potassium and 16.458 % ni

9966 [12]

It should be KNO3 to the best of my understanding

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3 years ago

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Explain why elements and compounds are pure substances