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iren2701 [21]
3 years ago
10

Which of the following does NOT involve a physical change?

Chemistry
1 answer:
jasenka [17]3 years ago
4 0

Answer:mixing decomposing

Explanation:

Melting and grinding changes the physical form and mixing decomposing doesn’t

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A laboratory technician combined sodium hydroxide with excess iron(II) nitrate. A reaction took place according to this chemical
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 The initial  mass  of sodium hydroxide  is  3.3 g (answer C)

 <u><em>calculation</em></u>

Step 1 : find the  moles of iron (ii) hydroxide (  Fe(OH)₂

moles =  mass÷  molar mass

from periodic table the  molar mass of Fe(OH)₂  = 56 + [16 +1]2  = 90 g/mol

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Step 2:  use the mole ratio to  calculate the moles of  sodium hydroxide (NaOH)

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therefore the moles of NaOH = 0.041 x 2 = 0.082 moles

Step 3: find  mass of NaOH

mass = moles x molar mass

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8 0
3 years ago
What is the mass of volume= 5.4 mL  density= 2.5 g/mL​
ddd [48]

Answer:

13.5g

Explanation:

Mass is defined as the measure of the amount of matter in an object. Its unit is kg or g.

Mass can be calculated using the formula:

m= d × v

where,

d= density

m= mass

v= volume

m= 2.5×5.4

m= 13.5g

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Explanation:

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3 years ago
Read 2 more answers
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