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Studentka2010 [4]
4 years ago
9

What are 3 signs that a chemical change (chemical reaction) has taken or is taking place?

Chemistry
1 answer:
kotykmax [81]4 years ago
6 0
Heat has been released or lost. Odor may be present. Absence of a substance may be converted to something else.
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What makes an atom a good conductor?
andrew-mc [135]
Very little electric force is required to cause electron flow in conductors. This is due to electrons called "free electrons", which exist in the atoms of conductors. "Free electrons" are electrons that are very weakly bonded to the atom. ... Metals such as copper, silver, and gold are good conductors.

Well, atoms are loosely bound and free to move through the material. Almost all, or just most, atoms will hold on to electrons very tightly and are insulators.
3 0
4 years ago
Given the reaction below:
lidiya [134]

The given equation is  is

2Cu+8HNO_{3}-->3Cu(NO_{3})_{2}+2NO+4H_{2}O

this is not balanced

The balanced equation will be:

3Cu+8HNO_{3}-->3Cu(NO_{3})_{2}+2NO+4H_{2}O

Now as per it if we are using eight moles of HNO3 we are getting two moles of NO

so for each mole of NO we have to take four moles of HNO3

Hence the mole ratio of NO produced to HNO3 reacted will be = 1:4

4 0
3 years ago
Please help me answer this question but in your own words!!!!
stiv31 [10]

Answer:

when sodium reacts with chlorine atoms, sodium will give an electron which is negative charged to chlorine.it makes sodium(+) and chlorine (-)..then sodium will attract chlorine to form sodium chloride(NaCl)

8 0
3 years ago
17. The equation below represents a chemical reaction that occurs in living cells.
RSB [31]

Answer:

36 atoms

Explanation:

  • C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy

The reactants are in the left side of the equation. <u>First we determine how many atoms are there in the C₆H₁₂O₆ molecule</u>:

  • 6 C atoms + 12 H atoms + 6 O atoms = 24 atoms in total

There are two atoms in a O₂ molecule, and there are 6 O₂ molecules in the equation:

  • 2 * (6 O atoms) = 12 atoms in total

The total number of atoms in the reactants is

  • 24 + 12 = 36 atoms
4 0
3 years ago
Which of these is an example of a chemical change?
dolphi86 [110]
The answer to this is D.
3 0
4 years ago
Read 2 more answers
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