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juin [17]
3 years ago
5

The heat of solution with calcium chloride is endothermic what will happen to the temperature of the container/flask when calciu

m chloride is added to water in the container/flask
Chemistry
2 answers:
tino4ka555 [31]3 years ago
6 0
Endothermic means it absorb energy from surrounding and its sign is positive so when it absorb this energy the flask or the container become colder 
Anna [14]3 years ago
6 0

Answer: the temperature of the container/flask will decrease.


Justification:


1) As stated in the question, the heat of the solution is endothermic.


Endothermic is a process (physical or chemical) in which energy is absorbed from the surroundings by the initial substances to end in the final state.


2) The fact of absorbing heat energy will translate in the decrease of temperature of the surroundings, in this case the container/flask.

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What does kinetic molecular theory mean
oee [108]

Answer: gas particles that are in constant motion and exhibit perfectly elastic collisions

Explanation:

8 0
3 years ago
Read 2 more answers
A 55.50 g gas sample of a gas, at stp, has a volume of 15.0 l. calculate the molecular mass of the gas
natta225 [31]
Answer is: the molar mass of gas is 82.83 g/mol.
m(gas) = 55.50 g; mass of gas.
V(gas) = 15.0 L; volume of gas.
Vm = 22.4 L/mol; molar volume of gas on STP.
n(gas) = V(gas) ÷ Vm.
n(gas) = 15 L ÷ 22.4 L/mol.
n(gas) = 0.67 mol; amount of gas.
M(gas) = m(gas) ÷ n(gas).
M(gas) = 55.5 g ÷ 0.67 mol.
M(gas) = 82.83 g/mol.


3 0
3 years ago
Read 2 more answers
List two possible steps where impurities may be gained, which would appear to be an increase in copper
Arisa [49]

Answer:

i) During washing

ii) During Measurement

Explanation:

The two possible steps are :

<u>i) During washing </u>: during the washing method the residue may be not completely dried out and this residue ( water) will add up to the final product ( copper yield ) and this kind of error is called human error.

<u>ii) During measurement </u>: If the weighing instrument is faulty there might be addition  in value of the final copper yield which will see the final yield value > 100% . this error occurs when the initial value and final value is  been weighed

8 0
3 years ago
Consider the following generic reaction for which Kp = 5.51 × 105 at 25°C:
lora16 [44]

Answer:

K_c=1.35\times 10^7

Explanation:

The relation between Kp and Kc is given below:

K_p= K_c\times (RT)^{\Delta n}

Where,  

Kp is the pressure equilibrium constant

Kc is the molar equilibrium constant

R is gas constant

T is the temperature in Kelvins

Δn = (No. of moles of gaseous products)-(No. of moles of gaseous reactants)

For the first equilibrium reaction:

2R_{(g)}+A_{(g)}\rightleftharpoons2Z_{(g)}

Given: Kp = 5.51\times 10^5  

Temperature =  25°C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

T = (25 + 273.15) K = 298.15 K  

R = 0.082057 L atm.mol⁻¹K⁻¹

Δn = (2)-(2+1) = -1  

Thus, Kc is:

5.51\times 10^5= K_c\times (0.082057\times 299)^{-1}

K_c\frac{1}{24.535043}=551000

K_c=13518808.69=1.35\times 10^7

3 0
3 years ago
Say you have a rock composed entirely of potassium-40. After two half-lives of potassium-40, what fraction of the rock is still
Assoli18 [71]

<u>Answer:</u> The fraction of the rock that is still composed of potassium-40 is 0.25

<u>Explanation:</u>

To calculate the fraction of the rock that is still composed of K-40, we use the formula:

a=\frac{a_o}{2^n}

where,

a = amount of reactant left after n-half lives

a_o = Initial amount of the reactant

n = number of half lives = 2

Putting values in above equation, we get:

\frac{a}{a_o}=\frac{1}{2^2}\\\\\frac{a}{a_o}=\frac{1}{4}=0.25

Hence, the fraction of the rock that is still composed of potassium-40 is 0.25

8 0
3 years ago
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