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2 years ago

What are characteristics of a good scientific investigation

Chemistry

1 answer:

bonufazy [111]2 years ago

8 0

The characteristics are

Hypothesis and observation

I hope that's help:0

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If atoms are made up smaller parts such as electrons, why are atoms considered the basic unit of matter

julsineya [31]

They are considered the basic units of matter because all mass is made of atoms.

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2 years ago

The compound Xe(CF3)2 decomposes in afirst-order reaction to elemental Xe with a half-life of 30. min.If you place 7.50 mg of Xe

Irina-Kira [14]

Answer:

$t=147.24\ min$

Explanation:

Given that:

Half life = 30 min

$t_{1/2}=\frac{\ln2}{k}$

Where, k is rate constant

So,

$k=\frac{\ln2}{t_{1/2}}$

$k=\frac{\ln2}{30}\ min^{-1}$

The rate constant, k = 0.0231 min⁻¹

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Given that:

The rate constant, k = 0.0231 min⁻¹

Initial concentration $[A_0]$ = 7.50 mg

Final concentration $[A_t]$ = 0.25 mg

Time = ?

Applying in the above equation, we get that:-

$0.25=7.50e^{-0.0231\times t}$

$750e^{-0.0231t}=25$

$x=\frac{\ln \left(30\right)}{0.0231}$

$t=147.24\ min$

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2 years ago

How are mutation affects different?

dsp73

Mutation affects can be different just with changes as small as the substitution of a single DNA building block or nucleotide base with another nucleotide base

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1 year ago

Is particle size one of the factors that affect solubility? How?

Over [174]

Hello!

The reduction in particle size results in an increased rate of solution. It occur because is harder for a a solvent to surround bigger molecules.

Hugs!

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2 years ago

Isotopes of the same element vary from each other in their number of:

Lina20 [59]

Answer: Neutrons vary from each other in their element

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2 years ago