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borishaifa [10]
3 years ago
8

Which can be used as an indicator of past climate?

Chemistry
1 answer:
Eddi Din [679]3 years ago
4 0

Answer:

Annual rings of trees in temperate forests

Explanation:

because fluctuations in ground surface temperatures propagate slowly downwards into the earth as a "temperature wave".

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Hydrazine, N2H4, may react with oxygen to form nitrogen gas and water.
Sindrei [870]

Answer:

The percent yield of the reaction is 35 %

Explanation:

In the reaction, 1 mol of hydrazine reacts with 1 mol O₂ to produce 1 mol of nitrogen and 2 moles of water.

Let's verify the moles that were used in the reaction.

2.05 g . 1mol/ 32 g = 0.0640 mol

In the 100% yield, 1 mol of hydrazine produce 1 mol of N₂ so If I used 0.0640 moles of reactant, I made 0.0640 moles of products.

Let's use the Ideal Gases Law equation to find out the real moles of nitrogen, I made (real yield).

1atm . 0.550L = n . 0.082 . 295K

(1atm . 0.550L) / 0.082 . 295K = n → 0.0225 moles

Percent yield of reaction = (Real yield / Theoretical yield) . 100

(0.0225 / 0.0640) . 100 = 35%

3 0
3 years ago
Read 2 more answers
Which of dalton's postulates about atoms are inconsistent with later observations? do these inconsistencies mean that dalton was
Neporo4naja [7]

1)  Dalton stated that atom is matter that can not be divided, but it is proved that the atom can be divided into subatomic particles  (electrons, protons and neutrons).

2) He stated that atoms of one element can not be changed into atoms of other  elements, but now that is possible by nuclear reactions.

Today we still use his postulate: Atoms combine in the ratio of small whole numbers to form stable compounds, for example H₂O.

6 0
2 years ago
Which pair of dispersed phases and dispersing media can never form a colloid?
lana66690 [7]

Answer:

Option B Liquid and Gas

7 0
3 years ago
Can someone plz help me? :(
Snezhnost [94]

Answer:

The answer is a. I learned that they can multiply by using your cells

6 0
2 years ago
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Which color in the rainbow has the longest wavelength? 1. orange 2. blue3. yellow4.green 5. red
rodikova [14]

In rainbow, the color that has the longest wavelength is red which means option 5 is the correct choice.

Dispersion is described to be the spreading of white mild into its complete spectrum of colors, in truth we also can say a complete spectrum of wavelengths. The white mild turns into from solar and includes seven colors. On one end of the spectrum is red with the longest wavelength. Blue or violet mild has the shortest wavelength. White mild is a aggregate of all hues withinside the color spectrum. The colors of the rainbow are: Red, orange, yellow, green, blue, indigo, violet.

Therefore, option 5 is the correct choice.

To learn more about rainbow check the link below:

brainly.com/question/12008276

#SPJ4

6 0
1 year ago
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