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Effectus [21]
4 years ago
11

The Law of Conservation of Energy is one of the most important principles in all of science. What does conservation mean in this

context?
a. Only small changes in the total energy of a system are possible
b. Planned management
c. Protection from running out
d. Careful usage
e. An increase or decrease is impossible
Chemistry
2 answers:
iogann1982 [59]4 years ago
8 0
I believe it is E because energy only transforms into other forms of energy.
Inessa [10]4 years ago
6 0
I think it’s protection from running out?
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How many moles of Na3PO4 are in 820. grams of it?
kotegsom [21]

Answer:Hello

D is correct

Explanation:

4 0
3 years ago
How many energy levels does period 5 and period 6 have?
creativ13 [48]
Period 5 has 5 energy levels and Period 6 has 6 energy levels
3 0
3 years ago
A compound has a mass percentage of 53.46% C, 6.98% H, and 39.56% O. What is the empirical formula for this compound
Lubov Fominskaja [6]

Answer:

The empirical formula is: C₂H₃O

Explanation:

The empirical formula, also known as the “minimum formula”, is the simplest expression to represent a chemical compound and indicates the elements that are present and the minimum integer ratio between its atoms.

The percentage composition is the percentage by mass of each of the elements present in a compound.

Having 100 g of the compound as a base, it is possible to express the percentages in grams. That is, assuming you have 100 g of the compound, you have 53.46 g of  C , 6.98 g of  H , and 39.56 g of  O.

Taking into account the molecular mass of each substance, the number of relative atoms of each chemical element is calculated:

C: 53.46 g *\frac{1 mol}{12.01 g } = 4.45 moles

H:6.98 g *\frac{1 mol}{1.01 g } = 6.91 moles

O:39.56 g *\frac{1 mol}{16g } = 2.47 moles

Now you divide each value obtained by the least of them:

C: \frac{4.45 moles}{2.47 moles}=  1.80

H:\frac{6.91 moles}{2.47 moles}= 2.8

O:\frac{2.47 moles}{2.47 moles}=1

Decimals approach the nearest integer, then:

C: 2

H: 3

O: 1

Therefore <u><em>the empirical formula is: C₂H₃O</em></u>

5 1
3 years ago
A sample is found to contain 1.29×10-11 g of salt. Express this quantity in picograms
xz_007 [3.2K]

Answer:12.9e-12g or in short 12.9pg

Explanation:as p=1e-12

4 0
3 years ago
^^^ order them , thank you!
alexandr1967 [171]

Answer:

Sugar dissolves best in water

Carbon Dioxide dissolves best in water

(Not 100% sure on this one) Salt is the least soluble in water

I hope this helped :)

7 0
3 years ago
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