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7nadin3 [17]
3 years ago
13

This exercise deals with safety issues in the Freezing Point Depression experiment. Choose the answer that best completes each s

tatement. (a) Stearic and lauric acids are 1 but prolonged contact with skin may cause 2 . (b) If either stearic acid or lauric acid is spilled on the skin, it should be
Chemistry
1 answer:
MAXImum [283]3 years ago
3 0

Answer:

A1 - non hazardous

A2 - irritation

B. Washed off with soap and water

Explanation:

- all materials or chemicals that are not specifically deemed hazardous that is does not cause any harm to the organism in the presence of the material or chemical.

- irritation is a discomfort to an organism which can be caused by an external substance like chemicals.

B. This is the action carried out in order to clean a substance off a surface of a body.

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[OH-] for a solution is
solong [7]

Answer:

B = basic

Explanation:

Given data:

[OH⁻] = 5.35×10⁻⁴M

pH = ?

Solution:

pOH = -log[OH⁻]

pOH = - [5.35×10⁻⁴]

pOH = 3.272

it is known that,

pH + pOH = 14

pH = 14- pOH

pH = 14 - 3.272

pH = 10.728

The acidic pH is range from zero to less than 7 while 7 pH is neutral and above 7 the pH is basic. So, the given solution is basic.

8 0
3 years ago
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Calculate the volume of a 0.225M solution of KOH required to react with 0.215g of acetic acid.
Sidana [21]
Hope this might help ask me if u have any doubts

7 0
3 years ago
Read 2 more answers
Consider the model of the nitrogen atom.
liq [111]

Answer:

1s2 2s2 2p3

Explanation:

we know that the number of electrons in an atom is equal to number of protons. So the number of electrons here is 7.

Using Moller chart, the electronic configuration is writen by the electrons first enterring into 1s then into 2s after 2p. The s orbital accomodates maximum of 2 electrons.

∴ for atomic no. 7 nitrogen atom, electronic configuration is 1s2 2s2 2p3.

5 0
3 years ago
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An ideal gaseous reaction (which is a hypothetical gaseous reaction that conforms to the laws governing gas behavior) occurs at
lana [24]

Answer:

ΔU = −55.45 kJ

Explanation:

From first law of thermodynamics in chemistry, we have;

ΔU = Q + W

where;

ΔU is change in internal energy

Q is the net heat transfer

W is the net work done

We are given;

Q = 74.6 kJ

But Q will be negative since heat is released

Thus;

ΔU = -74.6 kJ + W

We are given;

Constant pressure; P = 35 atm = 35 × 101325 = 3546375 N/m²

Volume before reaction; Vi = 8.2 L = 0.0082 m³

Volume after reaction; V_f = 2.8 L = 0.0028 m³

Now,

W = -P(V_f - V_i)

W = - 3546375(0.0028 - 0.0082)

W = 19.15 KJ

Thus;

ΔU = Q + W

ΔU = -74.6 kJ + 19.15 KJ =

ΔU = −55.45 kJ

6 0
3 years ago
What is the difference between parent material
Kazeer [188]

Answer:

Parent material is the geologic material from which soil horizons form. Many soils have more than one parent material, for example loess over till. ... Every soil horizon has a parent material, but the same parent material usually appears different in different horizons because soil formation processes have altered it.

Explanation:

8 0
3 years ago
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