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tatuchka [14]
3 years ago
15

What methods do scientists use to determine if a change was physical or chemical?

Chemistry
1 answer:
Bess [88]3 years ago
5 0
A physical change will not change the chemical make-up of the material. the change will not produce a new substance.

a chemical change will have a reaction that produces heat, light, a change in color, releases a gas, or rust
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One mole of Ca is equal to how many atoms​
Irina18 [472]

Answer:

1 mole of calcium contains 6.023 \times 10^{23} atoms.

Explanation:

1 mole is the amount of a substance that contains exactly 6.023\times 10^{23} constituent particles. 1 mole of a substance is always equal to the atomic mass of the element.

Hence, 1 mole of calcium will also have 6.023\times 10^{23} atoms.

Number of atoms in 1 mole calcium = 6.023 \times 10^{23} atom

4 0
3 years ago
Use the equation 2cu+o2=2cuo to find how many miles of copper react to form 3.64 mil cuo
Firlakuza [10]
<h3><u>Answer;</u></h3>

3.64 moles

<h3><u>Explanation;</u></h3>

From the equation;

2Cu + O2 → 2CuO

Mole ratio of Cu : CuO = 2: 2 equivalent to 1: 1

Moles of CuO = 3.64 Moles

Therefore;

moles of Cu will be ;

3.64 × 1 = 3.64 moles

Moles of Cu = <u>3.64 moles </u>

8 0
3 years ago
Read 2 more answers
Please help me with number 4
quester [9]

Answer:

Similar propoties is the answer

6 0
2 years ago
In a neutral atom, the number of protons is always equal to what other part of the atom?
Licemer1 [7]

Answer:

b. The number of electrons

Explanation:

A "neutral atom" has a <u>neutral charge</u>. This means that <em>its charge is equal to </em><em>zero. </em>In order for the charges to cancel out each other, the atom's <em>positive charge should be equal to the negative charge. </em>These being said, the number of electrons<em> (negatively-charged)</em> is then equal to the number of protons <em>(positively-charged). </em>Those atoms which are not neutral are called <em>"ions."</em> This means that they either have more or less electrons than the protons.

7 0
2 years ago
How many moles of iron in a sample that contains 7.91×10^23 atoms of iron?
vazorg [7]

Answer: 1.31

Explanation:  

No.of moles = given no.of atoms/Avagadro number

= 7.91×10^23 / 6.022 x 10^23

= 1.31

therefore, no.of moles = 1.31

Hope it helped u,

pls mark as the brainliest

^_^

5 0
2 years ago
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