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julia-pushkina [17]
3 years ago
10

Methods scientists use to determine if a change was physical or chemical.

Chemistry
2 answers:
Tpy6a [65]3 years ago
7 0
Chemical reactions can be identified when there is a change in color, energy is produced, change in odor, or if new substance forms.
alukav5142 [94]3 years ago
5 0
Chemical change can be determine by
change in color
energy
change in odor
rusting metal
wood burning
Physical change can be determine by
Ripping of paper
Sharpening of a pencil
Boiling of water
Melting an ice cube
Braking of glass

hope it helps



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The balanced equation is Mg + 2AgNO₃ ⟶ Mg(NO₃)₂ + 2Ag

Step 1. Write the <em>unbalanced equation </em>

Mg + AgNO₃ ⟶ Mg(NO₃)₂ + Ag

Step 2. Start with the<em> most complicated-looking formula</em> [Mg(NO₃)₂] and balance its atoms.

Mg: Already balanced —1 atom each side.

N: We need 2 N on the left. Put a 2 in front of AgNO₃.

1Mg + 2AgNO₃ ⟶ 1Mg(NO₃)₂ + Ag

O: Already balanced —6 atom6 each side.

Step 3: Balance <em>Ag</em>

We have 2Ag on the left. We need 2Ag on the right.

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We need 17.2 L of Ca(OH)2

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Volume Ca(OH)2 = 25.0 moles / 1.45 M

Volume Ca(OH)2 = 17.2 L

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