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pav-90 [236]
3 years ago
5

Which process best describes the melting of ice cream?

Chemistry
2 answers:
neonofarm [45]3 years ago
8 0
Ice<span> must absorb energy in order to </span>melt<span> (</span>melting<span> is an </span>endothermic<span> process).</span>
Novay_Z [31]3 years ago
8 0
Exothermic best describes the melting of ice cream

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Hydrogen gas and bromine gas react to form hydrogen bromide gas. How much heat (kJ) is released when 155 grams of HBr is formed
VashaNatasha [74]

Answer:

-37.63KJ

Explanation:

First, we write an equation of reaction:

H + Br ——-> HBr

Now we are told that 155g of HBr is formed. We can calculate the number of moles of HBr formed as follows:

We simply divide the mass of the HBr formed by the molar mass of HBr. The molar mass of HBr is 81g/mol

The number of moles of HBr formed is thus 81/155 = 0.52 moles

The amount of heat released is thus 0.52 * (-72) = -37.63KJ

8 0
3 years ago
Potassium chloride (KCl) is sometimes used to treat low blood potassium levels. Calculate the concentration of a saturated solut
brilliants [131]
Molarity  is the most convenient way to express concentration.

Mathematically, molarity is expressed as \frac{\text{mass of solute(g)}}{\text{gram molecular weight X Volume of solution (l)}}

In present case,
mass of solute (KCl) = 36 g
molecular weight of KCl = 74.55 g/mol
volume of solution = 100 ml = 0.1 l

∴ Molarity = \frac{36}{74.55X0.1}
                 = 4.829 M
Thus, conc. of saturated KCl at 20 oC is 4.829 M 
7 0
3 years ago
The pressure in car tires is often measured in pounds per square inch (lb/in.2), with the recommended pressure being in the rang
Minchanka [31]

Answer:

2.62 atm

Explanation:

1 atm = 14.6959 psi

38.5 / 14.6959 = 2.62 atm

4 0
2 years ago
2. How many moles of carbon dioxide, CO2, are in a 22 gram sample of the compound?
kotykmax [81]
To find the amount of moles in a molecule you divide the grams of the substance by the molar mass.
molar mass of CO2 = 44.01 g
22g / 44.01 = 0.50 moles CO2
4 0
3 years ago
Someone help me with this ASAP
ZanzabumX [31]

Answer:

First bone

Explanation:

6 0
4 years ago
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