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3 years ago

The freezing point of pure water at sea level is 0°C. What is that in kelvins?

Chemistry

2 answers:

bazaltina [42]3 years ago

6 0

Answer:b

Explanation:

The Kelvin degree is the same size as the Celsius degree; hence the two reference temperatures for Celsius, the freezing point of water (0°C), and the boiling point of water (100°C), correspond to 273.15°K and 373.15°K, respectively.

Gnesinka [82]3 years ago

6 0

Answer:

Explanation:

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a 0.1 kg slinky sits at the top of a staircase with 14 J of potential energy. How high is the staircase?

Bezzdna [24]

Answer: The staircase is 14.28 m high.

Explanation:

Given : Mass = 0.1 kg

Potential energy = 14 J

Potential energy is the energy occupied by the position of a substance. Therefore, formula for potential energy is as follows.

P.E = mgh

where,

m = mass

g = gravitational energy = $9.8 m/s^{2}$

h = height of object

Substitute the values into above formula as follows.

$P.E = m \times g \times h\\14 J = 0.1 kg \times 9.8 m/s^{2} \times h\\h = \frac{14 J}{0.1 kg \times 9.8 m/s^{2}}\\= \frac{14 J}{0.98 m kg/s^{2}}\\= 14.28 Js^{2}/ mkg (1 J s^{2}/m kg = 1 m)\\= 14.28 m$

Thus, we can conclude that the staircase is 14.28 m high.

5 0

3 years ago

a chemist wants to combine carbon and iron to form steel. what type of bond will this chemist create between these two elements

iVinArrow [24]

I think its a covalent bond because carbon is positively charged and iron is positively charged too which makes the bond covalent. hope it helps

5 0

3 years ago

Aqueous lead (II) nitrate, Pb(NO3)2 undergoes a double displacement reaction with aqueous sodium chloride, NaCl, in which a prec

slega [8]

Answer:

Explanation:

Pb(NO3)2(aq) + 2NaCl(aq) ==> PbCl2(s) + 2NaNO3(aq)

NO3- mixes with everything at beginning levels.

PbCl2 doesn't mix at all in water. It becomes a ppte, which means it is solid form. Your teacher might prefer using PbCl2(ppte). I think I'd ask to make sure.

7 0

2 years ago

How many particles would be found in a 12.7g sample of ammonium carbonate

Semenov [28]

Answer: The sample of ammonium carbonate contains

0.560 mol NH

Explanation:The chemical formula for ammonium carbonate is

(

)

. The formula indicates that in one mole of ammonium carbonate, there are two moles of ammonium ions,

4 0

4 years ago

Calculate the values of ΔU, ΔH, and ΔS for the following process:

kykrilka [37]

The values of the changes are

ΔH = 46.44kJ

Δu = 43.34Kj

ΔS = 126.6 J/K

<h3>How to find change in H</h3>

= 1 mol + 75.3 (100 + 273) - 25 + 273 + 1 * 40.79

= 5.6475 + 40.79

= 46.44kJ

<h3>How to find change in S</h3>

1 mol + 75.3 x ln 373/298 + 1 mol x 40.79

= 0.1263

ΔS = 126.6 J/K

<h3>How to find the change in U</h3>

46.44 - 0.00831 * 373

= 43.34Kj