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3 years ago

After measurements or observations are made in a scientific investigation, it is most appropriate to

Chemistry

2 answers:

erastovalidia [21]3 years ago

6 0

Jot the claim or evidence in a notebook

Olin [163]3 years ago

3 0

Answer:

The correct answer will be- propose a hypothesis based on the previous research work

Explanation:

In a scientific investigation, the process of investigation begins with making an observation. The observation is made by measuring the variables based on which the observation is divided into two types: qualitative and quantitative measurements.

After the observation is made, a scientific question is asked and background research is done based on which the scientific hypothesis is predicted and proposed which explains the phenomenon to a limited extent.

Formation of the hypothesis is the most important step as it has to be tested through the experiment and whole scientific investigation is based on this step.

Thus, propose a hypothesis based on the previous research work is the correct answer.

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How many atoms of lead are contained in 0.532mol?

Colt1911 [192]

Answer:

3.2043 x 10²³

Explanation:

No. of Mole of lead (Pb) = 0.532 mol

No. of atoms of lead = ?

Solution:

Formula Used to calculate

no. of moles = numbers of particles (ions, molecules, atoms) /Avogadro's number

Avogadro's no. = 6.023 x10²³

So,

The formula could be written as

no. of atoms of lead Pb = no. of moles x 6.023 x10²³

Put the values in above formula

no. of atoms of lead Pb = 0.532 mol x 6.023 x10²³

no. of atoms of lead Pb = 3.2043 x 10²³

so 3.2043 x 10²³ atoms of lead are contained in 0.532 mole.

6 0

3 years ago

A reaction of importance in the formation of smog is that between ozone and nitrogen monoxide described by O3(g)+NO(g)⟶O2(g)+NO2

julsineya [31]

Answer:

Initial rate of reaction is $2.07\times 10^{-3}M.s^{-1}$ .

Explanation:

It is a second order reaction.

Initial rate of reaction = $k[O_{3}]_{0}[NO]_{0}$ , where k is rate constant, $[O_{3}]_{0}$ is the initial concentration of $O_{3}$ and $[NO]_{0}$ is the initial concentration of NO.

Here, k = $4.09\times 10^{6}M^{-1}.s^{-1}$ , $[O_{3}]_{0}=5.84\times 10^{-6}M$ and $[NO]_{0}=8.65\times 10^{-5}M$

So, initial rate of reaction = $(4.09\times 10^{6}M^{-1}.s^{-1})\times (5.84\times 10^{-6}M)\times (8.65\times 10^{-5}M)$

= $2.07\times 10^{-3}M.s^{-1}$

So, initial rate of reaction is $2.07\times 10^{-3}M.s^{-1}$

8 0

3 years ago

What is the distinction between magma and lava

lesya692 [45]

Answer:

Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth's surface.

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3 years ago

In general, what causes a sea breeze?

ella [17]

Answer:

The usual cause of sea breeze is the difference in specific heat capacity between land and water Land heats and cools more quickly than water. What is the cause of a sea breeze? The air over the land is warmed and rises, to a greater temperature than that over the sea.

Explanation:

Your answer is C ! <3

7 0

3 years ago

Can you look people up on brainly

jasenka [17]

I think yes why?
LMFOAOOA

7 0

3 years ago