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2 years ago

Determine whether each practice is recommended to keep a micropipette clean and functioning properly.

Chemistry

1 answer:

Natasha2012 [34]2 years ago

8 0

Answer:

1. A

2. B

3. B

4. A

5. B

Explanation:

1. Recommended. That way cross-contamination is prevented.

2. Not recommended. The inner mechanism of the micropipette should not come in contact with any liquid whatsoever.

3. Not recommended. It contradicts statement 1.

4. Recommended. That way the micropipette remains completely vertical, minimizing the risks of being decalibrated.

5. Not recommended. If it lays on the bench it will be horizontal, thus contradicting statement 4.

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They have six valence electrons

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1 year ago

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Answer:

Explanation:

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2 years ago

PLEASE HELP! ASAP PLEASE :) Which of the following is not an example of Newton’s third law? A) All of these are examples of Newt

gavmur [86]

Newton's third law states that every action has an equal and opposite reaction. The action and reaction forces are pairs of opposing forces.

In the given examples all three obey Newton's third law.

B) Action force: John pulls the door handle

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Reaction: The road pushes on the tire, vehicle moves

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3 0

3 years ago

A gas has a volume of 543 ml. at a temperature of 75.0°C. What volume will the gas occupy at 20.2°C?

alexandr1967 [171]

Answer:

V₂ = 457.49 mL

Explanation:

Given that,

Initial volume, $V_1=543\ mL$

Initial temperature, $T_1=75^{\circ} C=75+273=348\ K$

Final temperature, $T_2=20.2^{\circ} C=20.2+273=293.2\ K$

We need to find the final volume of the gas. The relation between the volume and the temperature of the gas is given by :

$\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}$

Put the respected values,

$V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{543\times 293.2}{348}\\\\V_2=457.49\ mL$

So, the final volume of the gas is equal to 457.49 mL.

5 0

2 years ago