Answer:
Explanation:
The formula for the heat absorbed is
q = mCΔT
Trial 1
m = 30.0 g
ΔT = 40.0 – 0 = 40.0 °C
q₁ = 30.0 × 4.184 × 40.0 = 5020 J
Trial 2
m = 40.0 g
ΔT = 40.0 – 30.0 = 10.0 °C
q₂ = 40.0 × 4.184 × 10.0 = 1670 J
q₁ - q₂ = 5020 – 1670 = 3350 J
Answer:
MARK AS THE BRAINLIEST ANSWER
Explanation:
BRAINLIEST
Answer:
A
Explanation:
Both students are Pushing/Pulling towards the same direction meaning if enough force is applied the object will move into that direction
Answer:
a. 0.20 M HF and 0.10 M NaOH.
c. 0.10 M HF and 0.10 M NaF
d. 0.10 M HCl and 0.20 M NaF.
Explanation:
A buffer solution consists of a weak acid and its conjugate base, or of a weak base and its conjugate acid.
In this case, <u>HF is the weak acid and F⁻ is its conjugate base</u>.
Let's go case-by-case:
a. 0.20 M HF and 0.10 M NaOH.
- Some -but not all- HF will react and produce F⁻, leaving a buffer solution.
b. 0.10 M HF and 0.10 M NaOH.
- All HF will react, not a buffer solution.
c. 0.10 M HF and 0.10 M NaF.
- There's no reaction, and both HF and F⁻ are directly added, it is a buffer solution.
d. 0.10 M HCl and 0.20 M NaF.
- Some F⁻ will react and produce HF, leaving a buffer solution.
The correct answers are A), C) and D).