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elixir [45]
3 years ago
9

What chemical changes happen at school

Chemistry
1 answer:
kykrilka [37]3 years ago
8 0

Burning, cooking

Explanation:

Chemical changes that happens in school are:

Cooking of meals

 Burning of wastes

 Chemical reactions in laboratories

Rusting of iron used in construction

  • A chemical change is a change that produces new kinds of substances.
  • These changes are usually accompanied by energy and mass changes.
  • Most of such changes are not reversible.

Chemical changes are driven by change in chemical properties of matter.

In a school, iron components might begin to rust. This is a chemical change.

learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

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Please help me #6!!!!!!!!
Vesnalui [34]
I believe that the answer is 12 because there is already 3 O molecules and since its in parentheses with 3 outside it that means that there are 3 of those CO molecules meaning that for every 1 CO there will be 3 O’s so 3, four times Is 12
3 0
3 years ago
Gaseous methanol (CH4O) reacts with oxygen gas to produce carbon dioxide gas and liquid water. Balanced the equation using the l
NikAS [45]

Answer:

The sum of the coefficients in the balanced equation is 11

Explanation:

A reaction where an organic compound reacts with oxygen to produce carbon dioxide and water is called combustion.

The balance reaction of combustion for methanol is:

2CH₃OH (l) + 3O₂(g) →  2CO₂(g)  +  4H₂O (g)

Coefficients from stoichiometry are 2, 3, 2 and 4

Sum =  2 + 3 + 2 + 4 = 11

4 0
3 years ago
Which metals or non-metals are liquid at a room temperature of 25°C?​
irakobra [83]

Answer:

gallium

Explanation:

it is the old melting in a hot cup of coffee spoon

7 0
3 years ago
Read 2 more answers
Which tool should Darla and Rob use to measure the force that pulls a car down the map
svetoff [14.1K]

Answer:

C. A Spring Scale

Explanation:

Using process of elimination, we can quickly decide that a stopwatch and a ruler will not be useful in measuring the force. This leaves us with either the spring scale or a balance scale. A balance scale is used to compare two weights, so this is eliminated. That leaves us with a spring scale. This is because we can attached the spring scale to the car and when we let it go, we can record the force. I hope this helps!

5 0
2 years ago
A chemical reaction occurring in a cylinder equipped with a moveable piston produces 0.641 mol of a gaseous product. If the cyli
snow_tiger [21]

<u>Answer:</u> The final volume of the reaction is 4.69 L

<u>Explanation:</u>

The relationship of number of moles and volume at constant temperature and pressure was given by Avogadro's law. This law states that volume is directly proportional to number of moles at constant temperature and pressure.

The equation used to calculate number of moles is given by:

\frac{V_1}{n_1}=\frac{V_2}{n_2}

where,

V_1\text{ and }n_1 are the initial volume and number of moles

V_2\text{ and }n_2 are the final volume and number of moles

We are given:

V_1=2.05L\\n_1=0.280mol\\V_2=?L\\n_2=0.641mol

Putting values in above equation, we get:

\frac{2.05}{0.280}=\frac{V_2}{0.641}\\\\V_2=\frac{2.05\times 0.641}{0.280}=4.69L

Hence, the final volume of the reaction is 4.69 L

3 0
3 years ago
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