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3 years ago

DOES ANYONE KNOW? I think I know them but I want to be sure

Chemistry

1 answer:

sweet [91]3 years ago

7 0

1, should be (A) because small light molecules diffuse faster than the larger one.

2, Is (B) liquid follows up the container to the shape, molecules are loosely packed and always way moving.

The others I can’t really see I hope this helps :)

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Calculation: If you have a pH of 5.5 for a weak acid with a pKa of 4.76, then is there more A- or more HA in the solution? Expla

devlian [24]

Answer:

lets set the ratio -A/HA as R:

pH = pKa + log(R,10) => pKa + log10(R)

pH = 5.5

pKa = 4.76

R => 10^(pH - 4.76)

10^(pH - 4.76) => 5.4954

Given R (-A/HA) a number bigger than 1, then the concentration of -A is bigger than HA

Explanation:

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3 years ago

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(Numerical problems) A car is running with the velocity of 72km/h. What will be it's velocity after 5s if it's acceleration is -

kodGreya [7K]

The car's velocity after 5s : 10 m/s

<h3>Further explanation</h3>

Given

velocity=v=72 km/h=20 m/s

time=t = 5 s

acceleration=a = -2 m/s²

Required

velocity after 5s

Solution

Straight motion changes with constant acceleration

$\tt v_f=v_i+at$

vf=final velocity

vi = initial velocity

Input the value :

$\tt v_f=20+(-2).5\\\\v_f=20-10\\\\v_f=10~m/s$

The car is decelerating (acceleration is negative) so that its speed decreases

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3 years ago

How to calculate significant figures

Paul [167]

Answer:

There are three rules on determining how many significant figures are in a number:

Non-zero digits are always significant.

Any zeros between two significant digits are significant.

A final zero or trailing zeros in the decimal portion ONLY are significant.

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3 years ago

What is the modern atomic model sometimes called?

zavuch27 [327]

Bohr model is the answer

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3 years ago

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Identify this reaction <br> In pic

balu736 [363]

Answer:

Double displacement

Explanation:

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3 years ago