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2 years ago

Which structure does a plant cell have that an animal cell does not have?

Chemistry

1 answer:

satela [25.4K]2 years ago

6 0

Answer:

cell wall

Explanation:

plants are the only cells that have cell walls. no other type of organism have a cell wall

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Which of the following measurements is expressed to three significant figures?

Zepler [3.9K]

Which of the following measurements is expressed to three significant figures?
C. 5.60 km
Hope this helps!

5 0

2 years ago

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How do you test for carbon dioxide ?? Explain

g100num [7]

Answer:

Carbon dioxide reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate

Explanation:

. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white

5 0

2 years ago

If an isotope has an atomic number of 8 and a mass number of 18 how many neutrons

Artemon [7]

It will be Oxygen . And total 8 protons, 8 electrons and 9 neutrons are present in it.

6 0

3 years ago

How many moles of N2O5 are needed to produce 7.90 g of NO2? 2N2O5 = 4NO2 + O2

miv72 [106K]

Moles of N2O5 = moles of NO2 * ( 2 moles of N2O5 / 4 moles of NO2

3 0

3 years ago

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The solubility of o2 at 20c is 1.38 x10^-3. the partial presure of o2 in the air at sea level is 0.27 atm. using henery;s law, c

netineya [11]

<u>Answer:</u> The solubility of oxygen at 682 torr is $4.58\times 10^{-3}M$

<u>Explanation:</u>

To calculate the molar solubility, we use the equation given by Henry's law, which is:

$C_{A}=K_H\times p_{A}$

Or,

$\frac{C_{1}}{C_{2}}=\frac{p_{1}}{p_2}$

where,

$C_1\text{ and }p_1$ are the initial concentration and partial pressure of oxygen gas

$C_2\text{ and }p_2$ are the final concentration and partial pressure of oxygen gas

We are given:

Conversion factor used: 1 atm = 760 torr

$C_1=1.38\times 10^{-3}M\\p_1=0.27atm\\C_2=?\\p_2=682torr=0.897atm$

Putting values in above equation, we get:

$\frac{1.38\times 10^{-3}}{C_2}=\frac{0.27atm}{0.897atm}\\\\C_2=\frac{1.38\times 10^{-3}\times 0.897atm}{0.27atm}=4.58\times 10^{-3}M$

Hence, the solubility of oxygen gas at 628 torr is $4.58\times 10^{-3}M$

4 0

2 years ago