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LenKa [72]
3 years ago
5

Which of the following processes are physical changes?

Chemistry
2 answers:
lubasha [3.4K]3 years ago
8 0
C) cutting a snowflake out paper
because someone has to physically cut the paper into a snowflake
Stolb23 [73]3 years ago
7 0
C) and d) are physical changes while b) is chemical
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How many moles of nacl are required to make 500. 0 ml of a 0. 1 m solution of nacl?.
Illusion [34]

Answer:

Therefore 500 ml of solution have 0.25 mol of NaCl .. = 14.61 g (ans.)

Explanation:

7 0
2 years ago
How to solve 5gNaCl= MolE NaCl
valentinak56 [21]

0.086mole

Explanation:

The problem is very simple. It involves conversion from mass to number of moles of NaCl

What is mole?

 A mole is a unit of measuring chemical substances. It is the amount that contains the avogadro's number of particles.

How is it related and can be converted from mass;

 

Number of moles of a substance = \frac{mass}{molar mass}

Since we know the mass, we can find the molar mass and put into this equation;

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Number of moles of NaCl = \frac{5}{58.5}  = 0.086mole

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

4 0
3 years ago
How many atoms of each element are in one molecule of 2-heptanone?​
Alex17521 [72]
A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The 2-HEPTANONE molecule contains a total of 21 bond(s) There are 7 non-H bond(s), 1 multiple bond(s), 4 rotatable bond(s), 1 double bond(s) and 1 ketone(s) (aliphatic).
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State the total number of electrons occupying all the p- orbitals in one atom of chlorine .
V125BC [204]

Answer:A chlorine atom in its ground state has a total of seven electrons in orbitals related to the atoms third energy level.

Explanation:

8 0
3 years ago
What is the equation for the reaction of magnesium and iron 2 oxide
Pepsi [2]

<em>Maybe</em>

<em>Mg+</em><em>Fe2O3</em><em>→</em><em>F</em><em>e</em><em>+</em><em>MgO</em>

<em>hope</em><em> it</em><em> helps</em>

8 0
2 years ago
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