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valentina_108 [34]
3 years ago
14

For hundreds of years, people believed that life forms could just appear. That is because they could not see microscopic organis

ms. In 1859, Louis Pasteur performed an important experiment that proved there were small, unseen bacteria in the air that caused milk to sour and food to rot. He later linked that to unseen organisms that also cause disease. To which part of the Cell Theory did Pasteur make the biggest contribution? A) Cells are the basic units of life. B) All organisms are composed of cells. C) All cells come from pre-existing cells. D) Cells contain DNA which is found specifically in the chromosome
Chemistry
1 answer:
creativ13 [48]3 years ago
6 0

Answer:

Actually,the answer is C

Explanation:

All cells come from pre-existing cells.

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Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
SpyIntel [72]

The empirical formula of compounds formed from the given ions are as follows:

  • Pb⁴⁺ = PbO₂
  • NH₄⁺ = NH₄Cl
  • CrO₄²⁻ = Na₂CrO₄
  • SO₄²⁻ = K₂SO₄

<h3>What is the empirical formula of a compound?</h3>

The empirical formula of a compound is the simplest formula of the compound showing the simplest ratios in which elements in the compound combine.

The empirical formula of compounds formed from the given ions are as follows:

  • Pb⁴⁺ = PbO₂
  • NH₄⁺ = NH₄Cl
  • CrO₄²⁻ = Na₂CrO₄
  • SO₄²⁻ = K₂SO₄

In conclusion, the empirical formula is the simplest formula of a compound.

Learn more about empirical formula at: brainly.com/question/1581269

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4 0
2 years ago
Which is an example of a physical change?
levacccp [35]

Answer:

salt dissolving

Explanation:

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What is H20 and oxygen
olga2289 [7]
H2O means water, which is made of two hydrogen and one oxygen atoms.
Oxygen is a gas that your body needs to function. Oxygen comes from the air.
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What does every food energy chain start with?
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Producers (autotroph)

I’m sorry if this isn’t the answer you were looking for, if so, please be more specific and I can try to help again, thank you.
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Which term indicates how strongly an atom attracts the electrons in a chemical bond
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Electronegativity is your answer.

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