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mash [69]
3 years ago
5

White blood cells, part of the ___________ system, work closely with the ___________ system to protect us from infection and dis

ease.
Chemistry
1 answer:
Kisachek [45]3 years ago
6 0

White blood cells, part of the <u>circulatory</u> system, work closely with the <u>Immune</u> system to protect us from infection and disease.

hope this helps :)

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Water is believed to be one of the best fire extinguishers then why it is so that fire in oil spills over ocean/sea is difficult
Eddi Din [679]

Answer:

D

Explanation:

Trust me

6 0
2 years ago
If molar mass of M(OH)3 = 78 8. mass of M​
Cerrena [4.2K]

Answer:

From molar mass=total RAM of each individual element

78.8=(16+1)×3+M

78.8-51=M

27.8g/mol=M

5 0
3 years ago
If the melting point of a certain amount of a solid is 50 degrees, what is the melting point of half that amount of the solid? 5
borishaifa [10]
The answer is 25 degrees.
4 0
3 years ago
A sample of nitrogen gas, (N2), occupies 45.0 mL at 27.00∘C and 80.0 kPa. What will be the pressure if the gas is cooled to −73.
maxonik [38]

Answer:

The new pressure is 53.3 kPa

Explanation:

This problem can be solved by this law. when the volume remains constant, pressure changes directly proportional as the Aboslute T° is modified.

T° increase → Pressure increase

T° decrease → Pressure decrease

In this case, temperature was really decreased. So the pressure must be lower.

P₁ / T₁ = P₂ / T₂

80 kPa / 300K =  P₂/200K

(80 kPa / 300K) . 200 K = P₂ →  53.3 kPa

6 0
3 years ago
You have a 250. -ml sample of 1. 28 m acetic acid (ka = 1. 8 x´ 10–5). calculate the ph of the best buffer.
Nadya [2.5K]

The ph of the best buffer is 4.74

The given acetic acid is a weak acid

The equation of the pH of the buffer

pH = pKa + log ( conjugate base / weak acid ).

For best buffer the concentration of the weak acid and its conjugate base is equal.

pH = pKa + log 1

pH = pKa + 0

pH = pKa

given Ka = 1.8 × 10⁻⁵

pKa = - log ka

pH = -log ( 1.8 × 10⁻⁵ )

pH = 4. 74

Hence the pH of the best buffer is 4.74

Learn more about the pH on

brainly.com/question/22390063

#SPJ4

4 0
2 years ago
Read 2 more answers
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