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frez [133]
3 years ago
9

Is burning paper chemical or physical ?

Chemistry
2 answers:
aniked [119]3 years ago
7 0
This would be physical because it would be a physical change in the size of the paper. (Physical changes can be reversed but chemical changes cannot be reversed <span>with the substance changed back without extraordinary means</span>) 
natima [27]3 years ago
6 0
Chemical change is the answer to your question :)
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Hydrochloric acid and sodium hydroxide are mixed together to form salt and water. During the reaction, the temperature of the so
charle [14.2K]
It's a chemical change because bonds are being broken and formed.
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4 years ago
Jaina just got home from a difficult workout. She is complaining of muscle soreness and cramps. Which waste product of fermentat
sveticcg [70]
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8 0
3 years ago
A sample of pure lithium carbonate contains 18.8% lithium by mass. What is the % lithium by mass in a sample of pure lithium car
VashaNatasha [74]

Answer:

There is 18.8% lithium by mass in second sample

Explanation:

Both the two samples are pure lithium carbonate. So % lithium by mass will be same in both samples. This can be proved mathematically as follows-

Let's assume weight of first sample is x g

So, 100 g of sample contains 18.8 g of lithium

Hence, x g of sample contains (\frac{18.8}{100}\times x) g of lithium

Now, the second sample has weight equal to 2x g

So, 2x g of sample contains (\frac{18.8}{100}\times 2x) g of lithium

So, % lithium by mass in second sample = (\frac{\frac{18.8}{100}\times 2x}{2x})\times 100 % = 18.8%

4 0
4 years ago
Is condensation of ethanol a physical change or a chemical change
tigry1 [53]

Answer: Physical change

Explanation: Condensation is the phase change of a gas to the liquid state. There is no formation of new products so it does not undergoes chemical change. Any phase change is considered a physical change.

7 0
4 years ago
What is the density of 0.50 grams of gaseous carbon stored under 1.5 atm of pressure at a temperature of -20.0 C?
Colt1911 [192]

Answer: The density of 0.50 grams of gaseous carbon stored under 1.50 atm of pressure at a temperature of -20.0 °C is 0.867 g/L.

Explanation:

  • d = m/V, where d is the density, m is the mass and V is the volume.
  • We have the mass m = 0.50 g, so we must get the volume V.
  • To get the volume of a gas, we apply the general gas law PV = nRT

P is the pressure in atm (P = 1.5 atm)

V is the volume in L (V = ??? L)

n is the number of moles in mole, n = m/Atomic mass, n = 0.50/12.0 = 0.416 mole.

R is the general gas constant (R = 0.082 L.atm/mol.K).

T is the temperature in K (T(K) = T(°C) + 273 = -20.0 + 273 = 253 K).

  • Then, V = nRT/P = (0.416 mol)(0.082 L.atm/mol.K)(253 K) / (1.5 atm) = 0.576 L.
  • Now, we can obtain the density; d = m/V = (0.50 g) / (0.576 L) = 0.867 g/L.
6 0
4 years ago
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