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TEA [102]
4 years ago
11

How can liquid reach higher temperatures in a pressure cooker than in an unsealed pot?

Chemistry
2 answers:
bija089 [108]4 years ago
5 0

Answer:

Simple, the heat of it causes the atoms to move more quickly, which produces and uses energy.

Explanation:

Alex_Xolod [135]4 years ago
4 0

Answer:

the heat is circulating in the same spot rather than airing out into the open

Explanation:

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A government laboratory wants to determine whether water in a certain city has any traces of fluoride and whether the concentrat
nexus9112 [7]

<u>Answer:</u> The given sample of water is not safe for drinking.

<u>Explanation:</u>

We are given:

Concentration of fluorine in water recommended = 4.00 ppm

ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of fluorine in water, we use the equation:

\text{ppm}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 10^6

Both the masses are in grams.

We are given:

Mass of fluorine = 0.152mg=0.152\times 10^{-3}g    (Conversion factor:  1 g = 1000 mg)

Mass of water = 5.00 g

Putting values in above equation, we get:

\text{ppm of fluorine in water}=\frac{0.152\times 10^{-3}}{5}\times 10^6\\\\\text{ppm of fluorine in water}=30.4

As, the calculated concentration is greater than the recommended concentration. So, the given sample of water is not safe for drinking.

Hence, the given sample of water is not safe for drinking.

6 0
3 years ago
How much volume (in cm3) is gained by a person who gains 12.3 lb of pure fat?
maks197457 [2]

Answer:

So we are given with the mass while we are asked for the amount of volume. So this means, we must need an information on the density. From literature, the density of human fat is 0.918 g/cm³. Convert grams to lb by the conversion that 1,000 g = 2.2 lbs.

Density = 0.918 g/cm³ * (2.2 lbs/1,000 g) = 0.0020196 lb/cm³

Volume = Mass/Density = 12.2 lb / 0.0020196 lb/cm³

Volume = 6,040.8 cm³

4 0
3 years ago
Is brittleness a chemical or physical property?
Sergio039 [100]
It is a physical property

5 0
4 years ago
Read 2 more answers
Assign oxidation numbers to each element in this compound. NO
algol13

<u>Answer:</u>

NO ---> N +2 and O -2

<u>Explanation:</u>

Oxidation numbers are assigned to the elements of a compound to keep a track of the number of electrons each atom has.

Here we have a compound NO (Nitrogen Oxide). The Nitrogen is assigned an oxidation number of +2 while Oxygen in this compound is assigned an oxidation number of -2.

So the algebraic sum of the oxidation numbers of the elements in the compound NO is equal to zero.

5 0
3 years ago
Read 2 more answers
What volume of water must be added
stellarik [79]

Answer:

litre.50000665432158900643212lo

3 0
3 years ago
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