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2 years ago

6

Valence electrons are: O a. Electrons that have been lost in an atom O b. Electrons in the nucleus of an atom O c. electrons in

the outer-most shell of an atom O d. electrons in the inner-most shell of an atom

1 answer:

mestny [16]2 years ago

7 0

C ) outer most shell of atom

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How did Wegener use similar mountain ranges and areas made of certain types of rock found in Africa and South American as eviden

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Answer:

the Germany scientist Alfred Wagner describes fold mountains that are found in The world are the same also geological similarity that occur between this continent are the same for example the rock that are found in brazil are the same of that of south africa.

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2 years ago

Assuming that all the energy given off in the reaction goes to heating up only the air in the house, determine the mass of metha

nirvana33 [79]

Answer:

0.92 kg

Explanation:

The volume occupied by the air is:

$35.0m\times 35.0m \times 3.2m \times \frac{10^{3}L }{1m^{3} } =3.9 \times 10^{6} L$

The moles of air are:

$3.9 \times 10^{6} L \times \frac{1.00mol}{22.4L} =1.7 \times 10^{5}mol$

The heat required to heat the air by 10.0 °C (or 10.0 K) is:

$1.7 \times 10^{5}mol \times \frac{30J}{K.mol} \times 10.0 K = 5.1 \times 10^{7}J$

Methane's heat of combustion is 55.5 MJ/kg. The mass of methane required to heat the air is:

$5.1 \times 10^{7}J \times \frac{1kgCH_{4}}{55.5 \times 10^{6} J } =0.92kgCH_{4}$

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2 years ago

What is the main reason scientists perform experiments

Anuta_ua [19.1K]

B, they then interpret that data to find their answers

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3 years ago

Read 2 more answers

Can someone answer 4 for me please?

Mice21 [21]

I can’t see the whole question......

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2 years ago

BrainlieSTTTTTT A gas is originally stored at a pressure of 25 atm with a volume of 3 L. If the pressure were increased to 75 at

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Answer:

D. is correct.

Explanation:

0+-0&-0=kd

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2 years ago