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Sedaia [141]
2 years ago
15

Please help This is for my chemistry class and I need to get it done but I’m lost and need answers

Chemistry
1 answer:
Vanyuwa [196]2 years ago
5 0

Answer:

chlorine is a non metal.

sodium is a alkali metal.

helium is a noble gas.

nickel is a transition metal

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List the two main kinds of changes that you can observe when chemical reactions occur.
melisa1 [442]
Changes in energy and formation of new substances.
5 0
3 years ago
Calculate the amount of CO2 (in kg) released when 1 kg of coal is burned. Assume that carbon content of the coal is 50% by mass.
Delvig [45]

Answer:

1.8321 kg

Explanation:

The given 1 kg of coal contains 50% of the carbon atom by mass. Thus, mass of carbon in coal is \frac {50}{100}\times 1\ kg=0.5\ kg

Also, 1 kg = 1000 g

So, mass of carbon = 500 g

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Molar mass of carbon = 12.0107 g/mol

Moles of methanol = 500 g / 12.0107 g/mol = 41.6295 moles

Considering the reaction:

C+O_2\rightarrow CO_2

From the reaction,

1 mole of C react to form 1 mole of CO_2

So,

41.6295 moles of C react to form 41.6295 moles of CO_2

Moles of CO_2 = 41.6295 moles

Molar mass of CO_2 = 44.01 g/mol

So, Mass = Moles × Molar mass = 41.6295 moles × 44.01 g/mol = 1832.1143 g

Also, 1g = 0.001 kg

<u>So, amount of CO_2 released = 1.8321 kg</u>

4 0
3 years ago
write the steps you would use for making tea.use the words solution,solvent,solute,dissolve,soluble,insoluble,filtrate and resid
poizon [28]
1. Take 100ml of water as solvent and boil it few minutes.
2. Now add one tea spoon sugar, one tea spoon tea leaves and 50ml of milk. Here sugar, tea leaves and milk are solute.
3. Now boil it again for few minutes so that sugar will dissolves in solution as sugar is soluble in water
4. Now filter the solution. Collect the filtrate in cup. The insoluble tea leaves will be left behind as residue.
4 0
3 years ago
In order for the Colorado River to carve the deep Grand Canyon, what must happen first?
denis23 [38]
For the Colorado river to carve the Grand Canyon It must uplift the Colorado Palteau
8 0
3 years ago
The density of an object is 2 g/mL and has a mass of 18g, what is the volume of the object?
alexgriva [62]

Answer:

36

orrr

20

Explanation:

36 explanation:18x2=36

20 explanation:18+2=20

6 0
3 years ago
Read 2 more answers
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