I think it is false correct me if I’m wrong ...
A physical change occurs when a material changes state, these can include color, luster, melting/boiling point, hardness etc. Since the boiling point of water is changing state therefore it is a physical change
The temperature of a glass does not change state, it is just heated due to the boiling water
Answer:
The total volume of the buffer is 75,0mL
Explanation:
A buffer is a mixture of a weak acid with its conjugate base or a weak base with its conjugate acid.
The buffer than Stu and Doc made is:
CH₃COOH ⇄ CH₃COO⁻ + H⁺
Doc add 30.0 mL of 0.0635 M CH₃COOH while Stu add 45.0 mL of 0.0285 M NaCH₃COO (CH₃COO⁻)
Thus, the total volume of the buffer is:
30,0mL + 45,0mL =<em> 75,0 mL</em>
I hope it helps!
A. cyclohexyne is the answer
Answer:
(e) -6.1 J/K
Explanation:
Step 1: Given data
- Heat of fusion of ice (ΔH°fus): 333.5 J/g
Step 2: Calculate the heat (Qfreezing) required to freeze 5.0 g of water
We will use the following expression.
Qfreezing = -ΔH°fus × m
Qfreezing = -333.5 J/g × 5.0 g = -1.7 × 10³ J
Step 3: Calculate the entropy change (ΔS°) at 0 °C (273.15 K) and 1 atm
We will use the following expression.
ΔS° = Qfreezing/T
ΔS° = -1.7 × 10³ J/273.15 K = -6.1 J/K