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Vilka [71]
3 years ago
6

A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the bes

t demonstration that she could use?
Chemistry
1 answer:
Jlenok [28]3 years ago
5 0

when you crumble paper is still paper when you burn down paper you get ashes. that is want is call chemical and physical changes.

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A car battery produces electrical energy with the following chemical reaction. Pb + PbO2 + 2H2SO4 es001-1.jpg; 2PbSO4 + 2H2O Wha
rodikova [14]
The  mole  ratio of PbO2 to   water  in

Pb + PbO2 +2 H2SO4  = 2PbSO4 + 2H2O  is

            1 :2

1  mole of Pb reacted  with 1  mole  of PbO2    and 2  moles of H2SO4 to form 2 moles of PbSO4 and 2  moles of  H2O

therefore  the mole ratio  of Pbo2 to H2O is  1:2
4 0
3 years ago
Where is one example of where a Volcanic Neck exists on earth
Deffense [45]
Rio Puerco valley. The Rio Puerco volcanic necks, including the regionally visible Cabezon Peak, are all part of the Mount Taylor volcanic field.
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3 years ago
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The longer the bond, the smaller the bond enthalpy. the longer the bond, the smaller the bond enthalpy. false true
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True

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5 0
3 years ago
hen a chemical reaction occurs, the physical and chemical properties of the reactants are the same as the properties of the prod
Doss [256]

Answer: False

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3 0
4 years ago
Fe2O3 + Al ---> Fe + Al2O3
PIT_PIT [208]

Answer:

Fe2O3 + 2Al \rightarrow 2Fe + Al2O3

Explanation:

Hello!

In this case, when balancing chemical reactions, we must make sure that the atoms of each element are the same at both reactants and products; thus, for the given reaction, we need two iron and aluminum atoms at each side based on their subscripts in the given oxides as shown below:

Fe2O3 + 2Al \rightarrow 2Fe + Al2O3

Best regards!

5 0
3 years ago
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