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3 years ago

15

What effect would a decrease or increase in barometric pressure have on the boiling point

1 answer:

sladkih [1.3K]3 years ago

5 0

Answer:

Pressure Affects the Boiling Point

Atmospheric pressure influences the boiling point of water. When atmospheric pressure increases, the boiling point becomes higher, and when atmospheric pressure decreases (as it does when elevation increases), the boiling point becomes lower.

Explanation:

i think it will help you

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How do we know that K2CrO4 and Ba(NO3)2 are not solids?

navik [9.2K]

I would say is because of the Boron from O?

7 0

3 years ago

Gallionella bacteria can get energy from the reaction fe2+ → fe3+. This reaction is an example of

djverab [1.8K]

The gallionella bacteria reaction

that is Fe2+ → Fe3+ is example of oxidation reaction (answer A)

Explanation

oxidation reaction reaction occurs when electrons are lost during reaction by a molecule or ion or atom. when oxidation occurs the oxidation state of the molecule or ion or atom increases. For this reason Fe2+ → Fe3+ is a oxidation reaction since the oxidation state move from oxidation state 2 to 3

4 0

3 years ago

Read 2 more answers

If an object has a Mass of 11g and a volume fo 13mil, what is its density?

Nimfa-mama [501]

Answer:

$\boxed {\boxed {\sf B. \ d \approx 0.85 \ g/mL}}$

Explanation:

Density is found by dividing the mass by the volume.

$d=\frac{m}{v}$

The mass of the object is 11 grams and the volume is 13 milliliters.

$m= 11 \ g \\v= 13 \ mL$

Substitute the values into the formula.

$d= \frac{11 \ g}{13 \ mL}$

Divide.

$d=0.846153846 \ g/mL$

Round to the nearest hundredth. The 6 in the thousandth place tells us to round the 4 to a 5.

$d \approx 0.85 \ g/mL$

The density is about <u>0.85 grams per milliliter.</u>

8 0

3 years ago

Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a

agasfer [191]

Answer: 243 hours

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = initial amount of the reactant = $5.000\mu g$

a - x = amount left after decay process = $\frac{10}{100}\times 5.000\mu g=0.5\mu g$

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{73.00hours}=9.49\times 10^{-3}hours^{-1}$

b) for reducing the mass to 10.00 % of its original mass

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

$t=\frac{2.303}{9.49\times 10^{-3}}\log\frac{5.000}{0.5}$

$t=243hours$

The time taken to reach 10.00 % of its original mass is 243 hours

3 0

3 years ago

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%?

solong [7]

Answer:

d. 380g

Explanation:

The reaction of production of hydrogen from zinc and HCl is:

Zn + 2HCl → ZnCl₂ + H₂(g)

At STP (1atm of pressure and 273.15K), 112L are:

n = PV /RT

n = 1atm×112L / 0.082atmL/molK×273.15K

<em>n = 5.00 moles </em>

That means you need to produce 5.00 moles of hydrogen. Based on the reaction, 1 mole of Zn produce 1 mole of H₂(g), as yield of reaction is 85%:

5.00 moles H₂(g) ≡ 5.00 moles of Zn / 85% = <em>5.88 moles of Zn you need</em>

As molar mass of Zn is 65.38 g/mol:

5.88 moles Zn × (65.38g /mol) = 384 g of Zn ≡ <em>d. 380g</em>

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I hope it helps!

3 0

3 years ago