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3 years ago

Would the boiling point of water at 0.5 atm be lower, the same, or higher than the

Chemistry

1 answer:

dsp733 years ago

3 0

Answer:

Lower.

Explanation:

When you lower the pressure of water, it will usually decrease the boiling point. So, the higher you are on Earth, the lower the boiling point of H2O becomes.

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A catalyst is: one answer only pls help lol

natka813 [3]

A catalyst is a substance that speeds up a chemical reaction.

3 0

3 years ago

Read 2 more answers

A mixture contains only NaCl and Al2(SO4)3. A 1.45-g sample of the mixture is dissolved in water, and an ex- cess of NaOH is add

chubhunter [2.5K]

Answer:

The mass percent of aluminum sulfate in the sample is 16.18%.

Explanation:

Mass of the sample = 1.45 g

$Al_2SO_3+6NaOH\rightarrow 2Al(OH)_3+3Na_2SO_4$

Mass of the precipitate = 0.107 g

Moles of aluminum hydroxide = $\frac{0.107 g}{78 g/mol}=0.001372 mol$

According to reaction, 2 moles of aluminum hydroxide is obtained from 1 mole of aluminum sulfate .

Then 0.001372 moles of aluminum hydroxide will be obtained from:

$\frac{1}{2}\times 0.001372 mol=0.000686 mol$

Mass of 0.000686 moles of aluminum sulfate :

= 0.000686 mol × 342 g/mol = 0.2346 g

The mass percent of aluminum sulfate in the sample:

$=\frac{ 0.2346 g}{1.45g}\times 100=16.18\%$

5 0

3 years ago

This is how fluorine appears in the periodic table. A green box has F at the center and 9 above. Below it says fluorine and belo

Oksana_A [137]

1. Atomic weight of fluorine

2. Number of proton and neutrons found in the nucleus of the element

3. And every number uniquely identifies each of the the elements

8 0

3 years ago

Which of the following is a compound? a. iron b. lead c. helium d. methane

Lana71 [14]

The correct answer is d) methane ( $CH_4$ )

The other options are elements.

6 0

3 years ago

Which metal is more active than H2? (1) Ag (3) Cu (2) Au (4) Pb

astraxan [27]

Answer is (4) - Pb.

According to the reactivity series of elements

- the elements which are above the hydrogen are more reactive than hydrogen.

- the elements which are below the hydrogen are less reactive than hydrogen.

Among the given choices, only Pb is placed above the hydrogen in the reactivity series and rest are below the hydrogen.

Hence, Pb is more active than hydrogen.

5 0

3 years ago