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kumpel [21]
3 years ago
7

Which element is always present in a combustion reaction?

Chemistry
2 answers:
ikadub [295]3 years ago
6 0
I think the answer is oxygen is correct.
diamong [38]3 years ago
4 0
The element <u>Oxygen</u> is always present in a combustion reaction.
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In sexual reproduction, if each chromosome in a pair has the same genes, how is genetic variety possible?
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The same genes or slightly different versions of the same gene can be found on each chromosome in a pair. They form a line and split off bits of themselves, which they barter with one another. In sexual reproduction, crossing over is the first method that genes are shuffled to develop genetic variation.

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Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of Potassium Iodide solution to it. What would s
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She would observe a yellowish  solid precipitate which is the lead iodide and a white solid precipitate which is the potassium nitrate.

This is because the lead nitrate solution which contains particles of lead will mix with the potassium iodide solution containing  particles of iodide. Upon mixing,the  lead particles  from the Lead nitrate solution combines with the  iodide particles from Potassium iodide and form two compounds, a yellowish solid precipitate called lead iodide and a white solid  precipitate called Potassium nitrate.

The formation of entirely two new compounds is known as the double displacement reaction and can be written in a chemical equation as  

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See similar answer here  :https://brainly.in/question/46262462

4 0
2 years ago
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How many moles of copper would be needed<br> to make 1 mole of Cu,O?
azamat

Answer:

You can view more details on each measurement unit: molecular weight of Copper(I) Oxide or grams The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Copper(I) Oxide, or 143.0914 grams.

Explanation:

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3 years ago
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andrew-mc [135]

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a change in colour, change in temperature, change in smell, formation of a precipitate, or the formation of gas bubbles

Hopes this helps

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2 years ago
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