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3 years ago

What are two main forms of energy given off when paper burns and where does the energy come from

2 answers:

galina1969 [7]3 years ago

5 0

When paper burns, it releases two distinct forms of energy
Thermal Energy
Light Energy

Thermal Energy is heat energy, heat energy is formed from the flame on the paper, in this scenario.

Light energy comes from the reaction of the paper, the flame.

In conclusion, both energy's form from the reaction of the paper, and the combustion in the air. Thus, heat and light.

luda_lava [24]3 years ago

3 0

Thermal energy and light energy

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Calculate the number of O atoms in 0.364 g of CaSO4 · 2H2O

Nikolay [14]

Answer:

= 7.66 x 10²¹ oxygen atoms in 0.364 grams of CaSO₄·2H₂O

Explanation:

For problems like this posting, one needs an understanding of the following topics:

The definition of the mole

1 mole of substance = mass in grams of substance containing 1 Avogadro's Number ( = 6.023 x 10²³ ) of particles of the specified substance. This is generally one formula weight of the substance of interest. From this, the following equivalent relationships should be memorized:

1 mole = 1 formula weight = 1 mole weight (g)= 6.023 x 10²³ particles

Converting grams to moles:

Given grams => moles = grams/gram formula wt

Converting moles to grams:

Given moles => grams = moles x gram formula wt

_________________________________________________________

Calculate the number of O atoms in 0.364 g of CaSO₄ · 2H₂O.

Given mass CaSO₄ · 2H₂O = 0.364 grams

Formula Wt CaSO₄ · 2H₂O = 172 g/mole

moles CaSO₄ · 2H₂O = mass CaSO4 · 2H2O / formula Wt. CaSO₄ · 2H₂O

= 0.364 g CaSO₄·2H₂O / 172 g CaSO4·2H2O

= (0.364/172) mole CaSO₄·2H₂O

= 2.12 x 10⁻³ mole CaSO₄·2H₂O

∴ number of Oxy (O) atoms in 0.364 grams CaSO₄·2H₂O

= (2.12 x 10⁻³ mole CaSO₄ · 2H₂O)(6.023 x 10²³ molecules CaSO₄· 2H₂O/ mole)

= 1.276876 x 10²¹molecules CaSO₄· 2H₂O CaSO₄2H₂O

= 1.276876 x 10²¹ molecules CaSO₄· 2H₂O x 6 oxygen atoms / molecule

= 7.661256 x 10²¹ oxygen atoms in 0.364 grams of CaSO₄·2H₂O

= 7.66 x 10²¹ oxygen atoms in 0.364 grams of CaSO₄·2H₂O

8 0

2 years ago

When a substance changes from one phase to another, which of the following occurs? A. The substance loses or gains heat. B. The

a_sh-v [17]

A the substance loses or gains heat

6 0

3 years ago

Read 2 more answers

The table shows the average sleeping time of different organisms. According to the table above, the amount of sleep needed by hu

artcher [175]

Reduces from birth till old age is the answer because if you look at the chart, you can see that both the percentages and hours of total sleep time decrease as humans get older.

7 0

2 years ago

2.68 x 10^24 atoms of Cu equal how many moles? Help!!!

Scilla [17]

Answer:- $2.68*10^2^4$ atoms of Cu are equals to 4.45 moles.

Solution:- It is a atoms to moles unit conversion for which we divide the given number of atoms by Avogadro number.

$1 mol = 6.02*10^2^3 atoms$

We have been given with $2.68*10^2^4$ atoms and asked to convert them to moles.

The set up for this unit conversion problem would be as:

$2.68*10^2^4 atoms(\frac{1mol}{6.02*10^2^3 atoms})$

= 4.45 moles

So, there would be 4.45 moles of Cu in $2.68*10^2^4$ atoms of Cu.

4 0

2 years ago

Read 2 more answers

Climate change may cause the populations of some species to increase and expand their range of distribution. Explain why this ch

slega [8]

Answer:

An increase in the population of a species increases the chance of survival for that species. The species will be able to survive severe changes such as diseases and disasters. However, if the species moves into a new area competition will increase for the species already in that area. The increase competition will negatively affect these other species.

Explanation:

I hope this helps!

6 0

3 years ago