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kodGreya [7K]
3 years ago
14

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Chemistry
2 answers:
zloy xaker [14]3 years ago
7 0

Answer:

Dry ice undergoes sublimation, an endothermic change at room temperature.

emmasim [6.3K]3 years ago
6 0

Answer:

Dry ice undergoes sublimation, an endothermic change, at room temperature.

yuh:

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How many molecules are in 49.0 g of H2SO4? Answer in units of molec.
Leokris [45]

Answer:

= 3.01× 10^{23} molecules.

Explanation:

1 mole of H_{2}SO_{4} - 98g

? moles of H_{2}SO_{4} - 49g

= 49 ÷ 98 = 0.5 moles of O2 in 49g.

But 1 mole of any substance = 6.023 × 10^{23} molecules

∴ 0.5 moles = 0.5 × 6.023 × 10^{23} molecules

= 3.01× 10^{23} molecules.

7 0
3 years ago
Be sure to answer all parts. One gallon of gasoline in an automobiles engine produces on average 9.50 kg of carbon dioxide, whic
KIM [24]

Answer:

The answer is below

Explanation:

one gallon of gasoline produces 9.50 kg of carbon.

The total number of cars = 40 million

Distance covered by each car = 7930 miles

Consumption rate of the cars per miles traveled is 23.6 miles per gallon.

Hence the annual gasoline consumption by all the cars in the United States of America = (total number of cars × Distance covered by each car) ÷ Consumption rate of the cars per miles

annual gasoline consumption by all the cars = (40000000 × 7930 miles) ÷ 23.6 miles/gallon = `1.344067797 × 10¹⁰ gallons

1.344067797 × 10¹⁰ gallons = 1.344067797*10^{10}\  gallons *\frac{9.50\ kg}{1\ gallon} =1.276864407*10^{11}\ kg\ of \ carbon\ dioxide

4 0
3 years ago
At approximately what latitude do new york massachusetts and connecticut meet
vfiekz [6]
42nd parallel north is approx. the latitude that NY and Massachusetts and Connecticut meet
7 0
3 years ago
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How do helpful variations increase in a species over time?
Vladimir [108]

Answer:

through natural selection

Explanation:

Natural selection is the driving mechanism of the evolution of species. Organisms can survive more in an environment if they are capable to adapt the changing environmental conditions. After surviving they are also able to pass their modified trait into their future generations (evolution).

Helpful variations accumulate through natural selection, as the organisms that are better adapted to their environment reproduce offspring with the same variations.

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3 years ago
Which object converts sunlight into sugars
tatuchka [14]
Plants

do.  Good luck with whatever you are doing :)
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3 years ago
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