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Rom4ik [11]
3 years ago
10

Describe how chemists use mass as a way of getting a precise estimate of the number of entities in a sample.

Chemistry
1 answer:
jok3333 [9.3K]3 years ago
5 0

Answer:

Explanation:

To start with, the mass of a substance is centered on the amount of particles contained in it.

Mass of a substance measure is the same anywhere it is taken.

In chemistry, the concept of mole is used to find the exact estimate of  the number of entities in a sample.

A mole of substance is quantity that is used to express the number of particles contained in it.

  1 mole of any substance contains the Avogadro's number of particles.

This amount of particles is given as 6.02 x 10²³; the particles can be protons, neutrons, electrons e.t.c.

To find the number of moles;

        Number of moles  = \frac{mass}{molar mass}

       Through this, we clearly ascertain the number of entities in a sample given the mass.

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A scientist finds that a sample of matter contains three types of atoms. The sample can be any of the following, except:
GrogVix [38]

Answer:

The correct answer is C. element

Explanation:

The sample cannot be an element because an element - or <em>elemental substance</em> - cannot be decomposed into simpler substances. Thus, it cannot be composed by differents types of atoms. For example, an element is carbon (C).

As the sample contains <u>three types of atoms</u>, it can be a compound, a molecule or a mixture, because they can be composed by different types of atoms - of different chemical elements. For example, the sample could contain the element carbon (C) combined with other elements, for example oxygen (O) or hydrogen (H), amoing others.

6 0
3 years ago
Does a displacement reaction take place in 'magnesium + lead nitrate'? and if so why?
cestrela7 [59]

Answer:

Maybe or maybe not (not sure)

Explanation:

A displacement reaction is a type of reaction where one element is displaced by another from a compound.

In the case of magnesium and lead nitrate, magnesium is more reactive than lead. Therefore, it will displace lead from lead nitrate to form magnesium nitrate and lead.

The reaction can be represented as:

Mg(s) + Pb(NO3)2(aq) → Mg(NO3)2(aq) + Pb(s)


Another answer could be;

A displacement reaction does not take place in 'magnesium + lead nitrate' because magnesium is more reactive than lead.

5 0
2 years ago
The rate of reaction was measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10-6 M/s.
avanturin [10]

Answer:

The rate would be lower and the concentration of reactants would be lower.

Explanation:

The rate of a chemical reaction depends on the rate constant and the concentration of reactants.

For Ex:

For a reaction experimentally given by A + B ----> C + D

Rate = k[A][B]

where k is the rate constant

          [A] = concentration of reactant A

          [B] = concentration of reactant B

As the reaction proceeds,the concentration of reactant decrease and concentration of products increase.Rate constant k depends only on temperature and activation energy.Hence it will remain constant throughout the reaction assuming that reaction is carried out at constant temperature and pressure.

Hence rate will depend only on concentration of reactants and hence decrease with decrease in concentration of reactants.

8 0
3 years ago
What is the current model of atom
leonid [27]

Answer:

The bohr model is the model in use today

7 0
2 years ago
The chemical formula for methanol is: Calculate the molar mass of methanol. Round your answer to decimal places.
miss Akunina [59]

Answer:

<h3>CH3OH (Methanol)</h3>

MM = 12 + 8 + 16 = 36u

8 0
3 years ago
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