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jenyasd209 [6]
3 years ago
10

A cell phone has more mass than a feather because it

Chemistry
1 answer:
vladimir2022 [97]3 years ago
8 0
A cell phone takes up more space than a feather, which is why it has more mass.
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What kind of change results in a new substance being produced
tatiyna
Chemical change creates a new substance
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3 years ago
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Limestone (CaCO3) is decomposed by heating to quicklime (CaO) and carbon dioxide. Calculate how many grams of quicklime can be p
Harman [31]

Answer: 2800 g

Explanation:

CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass = 5 kg = 5000 g

\text{Number of moles}=\frac{5000g}{100g/mol}=50moles

1 mole of CaCO_3 produces = 1 mole of CaO

50 moles of CaCO_3 produces =\frac{1}{1}\times 50=50moles of CaO

Mass of CaO=moles\times {\text{Molar mass}}=50moles\times 56g/mole=2800g

2800 g of CaO is produced from 5.0 kg of limestone.

3 0
3 years ago
What kind of exercise does not require the use of oxygen to metabolize energy? strength aerobic stretching anaerobic
MatroZZZ [7]

Answer:

See Below

Explanation:

'an aerobic ' means it does not use oxygen

7 0
2 years ago
How many atoms are there in 23g of Na? How would I attempt this question. Thanks
Pavlova-9 [17]
Avodagros number i.e. 6.023 ×10^23
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3 years ago
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Classify each cation as a weak acid or pH neutral (neither acidic nor basic).
Alexeev081 [22]

Answer:

a. Na+ is pH neutral

b. Ni2+ = weak acid

c. NH4+ = Weak acid

Explanation:

To know the nature of the cation we need to find the nature of its conjugate base.

If the conjugate base of the ion is a strong base, the ion is neutral.

If the conjugate base is a weak base, the ion is a weak acid:

a. Conjugate base Na+ = NaOH

Sodium hydroxide is a strong base:

Na+ is pH neutral

b. Conjugate base Ni²⁺: Ni(OH)2 is a weak base because is not completely soluble in water. That means:

Ni2+ = weak acid

c. Conjugate base NH4+: NH4OH. Weak base:

NH4+ = Weak acid

3 0
2 years ago
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