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Anit [1.1K]
3 years ago
9

Fill in the blanks to complete the statements about the gases in Earth’s atmosphere. Earth’s atmosphere is mostly nitrogen, whic

h makes up about 78 percent of the atmosphere, and , which makes up about 21 percent. in the air condenses around tiny particles, causing clouds and rain. The gas exists in small amounts but is very important because plants use it to make food.
Chemistry
2 answers:
vivado [14]3 years ago
8 0

Answer:

1) Oxygen

2) water vapor

3) carbon dioxide

nasty-shy [4]3 years ago
8 0

Answer:

Earth’s atmosphere is mostly nitrogen, which makes up about 78 percent of the atmosphere, and  

✔ oxygen

, which makes up about 21 percent.  

✔ water vapor

in the air condenses around tiny particles, causing clouds and rain. The gas  

✔ carbon dioxide

exists in small amounts but is very important because plants use it to make food.

Explanation:

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Answer:

D

Explanation:

its a very old study and philosophy of how to change basic substances such as metals into other substances

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What evidence supports a scientist's conclusion that fossil B is older than fossil A? (4 points)
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If you have 66 pencils, how many dozen do you have
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5.5

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3 years ago
A sample of 14.5 g of sodium bicarbonate (NaHCO3) was dissolved in 100 ml of water in a coffee-cup calorimeter with no lid by th
Ann [662]

Answer:

The ΔH of the reaction is + 12.45 KJ/mol

Explanation:

Mass of water= 100ml = 100g. (You should always assume 1cm3 of water as 1g)

heat capacity of water = 4.18 Jk-1 Mol-1

Change in temperature = (19.86 - 25.00) = -5.14 K (This is an endothermic reaction because of the fall in temperature)

Molar mass of NaHCO3 = 84 g/mol

Mole of NaHCO3 = 14.5 / 84 = 0.173 mol

Step 1 : Calculate the heat energy (Q) lost by the water.

            Q = M x C x ΔT

            Q = -100 x 4.18 x (-5.14)

            Q = 2148.5 joules

            Q = 2.1485 K J

Step 2: Calculating the ΔH of the reaction?

          ΔH = Q / number of moles of NaHCO3

          ΔH = 2.1485 / 0.173

          ΔH = 12.42 KJ/mol

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3 years ago
Enter your answer in the provided box. the ph of a bicarbonate-carbonic acid buffer is 7.06. calculate the ratio of the concentr
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The ratio would be 12.6 of carbon acid
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