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GarryVolchara [31]
2 years ago
6

Chemical reactions

Chemistry
1 answer:
Sergio039 [100]2 years ago
3 0

Answer:

D

Explanation:

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Which statements correctly describe light? (Select all that apply.)
Ainat [17]

Answer:

it says select all that apply hhh easy just select and apply the answer hhh

Explanation:

8 0
2 years ago
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In the lab you measure a clean dry crucible and cover to be 24.36 grams. You obtain a 2cm piece of pure magnesium metal. After s
mart [117]

Answer:

1) 0.3g Mg

2)0.5g MgO

3)0.2g O

4)0.01mol Mg & 0.01mol O

5)0.01mol MgO

6) Empirical formula MgO

Explanation:

The mass og Mg is obtained by substracting 24.36g from 24.66g:

24.66 - 24.36 = 0.3g Mg

The ignition of Mg means that it's reacting with oxygen to form an oxide. The increase in the crucible mass after the Mg ignition is due to the addition of oxygen. However, the addition of few drops of water produces a new compound: a hydroxide. According to the oxidation state og Mg (2+), the only magnesium oxide possible is MgO. It happens because the oxidation state of oxygen in oxides is 2-. Which means that just one oxygen atom is required to electrically neutralize one magnesium atom.

We can use a conversion factor to know how much MgO is made from from 0.3 g of Mg:

0.3g Mg*\frac{16gO}{24.3gMg}= 0.2g O

Thereby the mass of the oxide is 0.2g O + 0.3g Mg = 0.5g MgO

We convert the mass of oxygen and magnesium to the respective amounts in moles by using conversion factors:

0.2g O*\frac{1 mol O}{16g O}= 0.01mol O

0.3g Mg*\frac{1mol Mg}{24.3g Mg}= 0.01mol Mg

The moles of MgO can be obtained from:

0.5g MgO*\frac{1mol MgO}{40.3g MgO}= 0.01mol MgO

To obtain the empirical formula, the amount fo moles of each elements must be divided by the smallest one, in this case, 0.01.

The result for both number of  Mg atoms and O atoms is 1. This can be interpreted to mean that there is a Mg atom for each O atom forming the  formula unit of the compound.

The step when water is added to the compound resulting after heating does not affect the calculations necessary for the magnesium oxide.

4 0
2 years ago
Of these four liquids, which is the most viscous?
Iteru [2.4K]
I believe the correct answer from the choices listed above is the last option. <span>Of these four liquids, the most viscous one is honey at room temperature. Honey is made up of sugars and the hydrogen of the sugars and water is what makes it more viscous.</span>
6 0
2 years ago
Read 2 more answers
CAN SOMEONE HELP ME I WILL GIVE CROWN???!!!!
lutik1710 [3]

Answer:

gravity?

Explanation:

since it's being taken down

4 0
2 years ago
The density of ice is 917 kg/m3. The density of salt water is 1029 kg/m3. A mass of ice is 2.55 x 1013 kg. Calculate the volume
Ksju [112]

Answer:

Volume of salt water, V_{sw} = 247.74 km^3

Explanation:

Density of Ice, \rho_{ice} = 917 kg/m^3

Density of salt water, \rho_{sw} = 1029 kg/m^3

Volume of ice, V_{ice} = 278 km^3

Volume of salt water, V_{sw} = ?

Mass = Density * Volume

Mass of Ice, m_{ice} = \rho_{ice}V_{ice}

Mass of Salt water, m_{sw} = \rho_{sw}V_{sw}

Since , m_{ice} = m_{sw}

\rho_{ice}V_{ice} = \rho_{sw}V_{sw}\\\\(917*278) = (1029*V_{sw})\\\\V_{sw} = \frac{254926}{1029} \\\\V_{sw} = 247.74 km^3

5 0
3 years ago
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