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2 years ago

5

What two things lead to genetic variation

1 answer:

vredina [299]2 years ago

6 0

Answer:

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes.

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What is the lead concentration of a saturated solution of lead(II) sulfate containing 0.020 M Na2SO4? Ksp for PbSO4 = 6.3x10-7.

labwork [276]

Answer:

i want to help but i d k. the answer :( sorry i couldnt help

Explanation:

8 0

3 years ago

4Na (s) + O2 (g) - 2Na20 (s)

olga_2 [115]

Answer:

How much excess reagent remains when the reaction is over? ... 3) How many grams of sodium nitrate will be produced from 4.3 mol lead(ID.

Explanation:

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2 years ago

With some value of mixture CO and O2 density by Hydrogen is 15 . When reaction begun some time later density by Hydrogen of the

liubo4ka [24]

For every 2 moles of CO and 1 mole of O2, 2 moles of CO2 will be produced.

The ratio is 2:1:2.

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8 0

3 years ago

You are given a sample of limestone, which is mostly CaCO3, to determine the mass percentage of Ca in the rock. You dissolve the

irakobra [83]

Answer:

34.15% is the mass percentage of calcium in the limestone.

Explanation:

Mass of precipitate that is calcium oxalate = 140.2 mg = 0.1402 g

1 mg = 0.001 g

Moles of calcium oxalate = $\frac{0.1402 g}{128 g/mol}=0.001095 mol$

1 mole of calcium oxalate have 1 mole of calcium atom.

Then 0.001095 moles of calcium oxalate will have 0.001095 moles of calcium atom.

Mass of 0.001095 moles of calcium :

0.001095 mol × 40 g/mol = 0.04381 g

Mass of sample of limestone = 128.3 mg = 0.1283 g

Percentage of calcium in limestone:

$\frac{0.04381 g}{0.1283 g}\times 100=34.15\%$

34.15% is the mass percentage of calcium in the limestone.

7 0

3 years ago

Read 2 more answers

How many sodium atoms does 2NaOH have?

attashe74 [19]

Answer:

1

Explanation:

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3 years ago

Read 2 more answers