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2 years ago

True/False: Animal embryos look similar early in development because all animals share a common ancestor.

Chemistry

2 answers:

user100 [1]2 years ago

8 0

You should go on yahoo answers and ask it! Someone will get back to you

sweet-ann [11.9K]2 years ago

7 0

Answer:

True

Explanation:

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Calculate the mass of 9.75x1021 atoms of helium.

Leya [2.2K]

Answer: 99.5475

Hope this helps(:

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2 years ago

Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas

Zinaida [17]

Answer: Number of molecules of hydrogen gas $6.32\times 10^{32}$

Explanation:

$2Na+2H_2O\rightarrow 2NaOH+H_2$

Number of moles of sodium = $\frac{\text{mass of sodium}}{\text{molar mass of sodium}}=\frac{48.7 g}{23 g/mol}=2.11mol$

According to reaction , 2 moles of sodium produces 1 mole of hydrogen gas , then 2.11 mol of sodium will= $\frac{1}{2}\times 2.11 mol$ of hydrogen gas that is 1.05 moles of hydrogen gas.

Number of molecules = $N_A(\text{Avogadro number})\times$ moles of substance

Moles of hydrogen gas formed = 1.05 moles

Number of molecules of hydrogen gas = $N_A\times$ moles of hydrogen gas

Number of molecules of hydrogen gas $=6.022\times 10^{23} mole^{-1}\times 1.05 mole=6.32\times 10^{32}$

8 0

2 years ago

What is ocean crust??!

kirill [66]

Answer:

<h3>Ocean crust is the relatively thin part of the earth's crust which underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.</h3>

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3 years ago

How does government ensure a safe environment for inverters?

Anestetic [448]

hope it helps please brainliest

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2 years ago

If the pH of an acid is 4.0, what is the pOH?

LiRa [457]

Well from my research I've calculated that pH + pOH = 14.00. in conclusion
pOH = 14.0 - 4.0 and so forth that equals 10.0 your welcome

6 0

2 years ago

Read 2 more answers