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artcher [175]
3 years ago
11

Which order shows the materials having the highest to lowest temperature after 15 minutes of being under the lamps?

Chemistry
2 answers:
diamong [38]3 years ago
8 0

Answer:

The answer to the question is

<h2>A. Air, Soil, Sand, Water</h2>

Explanation:

dsp733 years ago
7 0

Answer:

air, soil, sand, water

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How many grams of solid NaOH are required to prepare a 400ml of a 5N solution? show your work!
Nuetrik [128]

<u>Answer:</u> The mass of solid NaOH required is 80 g

<u>Explanation:</u>

Equivalent weight is calculated by dividing the molecular weight by n factor. The equation used is:

\text{Equivalent weight}=\frac{\text{Molecular weight}}{n}

where,

n = acidity for bases = 1 (For NaOH)

Molar mass of NaOH = 40 g/mol

Putting values in above equation, we get:

\text{Equivalent weight}=\frac{40g/mol}{1eq/mol}=40g/eq

Normality is defined as the umber of gram equivalents dissolved per liter of the solution.

Mathematically,

\text{Normality of solution}=\frac{\text{Number of gram equivalents} \times 1000}{\text{Volume of solution (in mL)}}

Or,

\text{Normality of solution}=\frac{\text{Given mass}\times 1000}{\text{Equivalent mass}\times \text{Volume of solution (in mL)}}         ......(1)

We are given:

Given mass of NaOH = ?

Equivalent mass of NaOH = 40 g/eq

Volume of solution = 400 mL

Normality of solution = 5 eq/L

Putting values in equation 1, we get:

5eq/L=\frac{\text{Mass of NaOH}\times 1000}{40g/eq\times 400mL}\\\\\text{Mass of NaOH}=80g

Hence, the mass of solid NaOH required is 80 g

4 0
3 years ago
The pHof a buffer solution containing 0.10 Macetic acid and 0.10 M
zysi [14]

<span>Chemical reaction: CH</span>₃COO⁻(aq) + H⁺(aq) ⇄ CH₃COOH(aq).

H⁺ is from HNO₃: HNO₃ → H⁺ + NO₃⁻.

<span>A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H</span>⁺ in a solution.

Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.

8 0
3 years ago
A green plant has _ energy
katrin2010 [14]
A green plant has chemical energy
5 0
3 years ago
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No. free poijnts ,,,,,,,
arsen [322]
Yes free pointssssss
6 0
3 years ago
Read 2 more answers
NEED HELP QUICK!!!<br> pls give quick reason why
weqwewe [10]

Answer:

- 20 J

Explanation:

Heat of Reaction = Heat of Products - Heat of Reactants

From the graph;

Heat of Products = 10

Heat of Reactants = 30

Heat of Reaction = 10 - 30 = -20 J

4 0
3 years ago
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