Chemistry, 14.01.2020 21:31 monique69

Chemical reactions can be detected by change in:
1. temperature color
2. overall mass of the products compared to the mass of the reactants
3. density of the products compared to the reactants

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Answer from: krlx

1. temperature color

3. density of the products compared to the reactants

Explanation:

In a chemical reaction, there is a rearregement in the atoms breaking and bonding different bonds producing a change in energy that means a change in temperature.

A chemical reaction can be detected by change in color in reactions as titrations, for example, where phenolphthalein is pink in basic pH and non-color in acid pH.

For the law of conservation of matter, overall mass of the products is the same to the mass of the reactants.

As in a chemical reaction you have a rearregement in the atoms, it is possible that this rearregement produce a better organization in the atoms increasing density or a poor organization decreasing density.

I hope it helps!

Answer from: Quest

explanation: well the force of an object when it lands sitting on the ground isthe force of a wide rage of situations crucial to physics? ; ( i 'm trying my best to alot but im not smart enofe you for giving me this chance though! 3(

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

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Chemical reactions can be detected by change in:
1. temperature color
2. overall mass o...

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