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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?

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.

4 0

3 years ago

Read 2 more answers

The longer the bond, the smaller the bond enthalpy. the longer the bond, the smaller the bond enthalpy. false true

Temka [501]

True

As the shorter the bond, the stronger it is hence more energy will be required to overcome this bond

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

Explanation:

In chemical reactions new substances are formed.

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