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3 years ago

Please could you help me with this question

Chemistry

2 answers:

Serga [27]3 years ago

8 0

The one on the left is pure because it is made out of one single material. The one on the right is a mixture because it is made out of multiple materials

matrenka [14]3 years ago

4 0

Answer:

first one pure

second one mixture..

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46. True or false. Chemical reactions do not involve changes in the chemical bonds that join

Naddika [18.5K]

Answer:

Chemical reactions do not involve changes in the chemical bonds that join

atoms in compounds :

False

Explanation:

Chemical reaction are the reaction in which old bonds break and new bonds are formed . The formation of new bond result in formation of new compounds . This happen because new bond are result of linking different atoms by the bond.

For example : Water formation from Oxygen and Hydrogen is a chemical process :

$2H_{2}+O_{2}\rightarrow 2H_{2}O$

Original(old) bonds are :

H-H bond in H2 and O-O bonds in O2

In H2 = Hydrogen is joined to Hydrogen

IN O2 = Oxygen is joined to oxygen

New Bonds =

O-H bonds in water (H2O)

Oxygen is joined to hydrogen = New Bond formation

Hence,

Chemical reactions do involve changes in the chemical bonds that join

atoms in compounds

3 0

3 years ago

How many atoms are there in 32.45 grams of Magnesium?

levacccp [35]

Answer:

8.13 ×10²³ atoms

Explanation:

Given data:

Mass of magnesium = 32.45 g

Number of atoms = ?

Solution:

Number of moles of Mg:

Number of moles = mass/molar mass

Number of moles = 32.45 g/ 24 g/mol

Number of moles = 1.35 mol

Number of atoms:

1 mole contain 6.022×10²³ atoms

1.35 mol × 6.022×10²³ atoms/ 1mol

8.13 ×10²³ atoms

5 0

3 years ago

How do I get an atomic mass

ahrayia [7]

To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons.

3 0

3 years ago

Given the balanced equation below, how many moles of chromium are

fenix001 [56]

Bbbbbbbbbbbbbbbbbbbbbbbb

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3 years ago

Suppose much of an old forest will be used for farmland. A certain portion of the land will be set aside as wildlife habitat. Yo

WITCHER [35]

Answer:

A certain portion of the land will be set aside as wildlife habitat

7 0

2 years ago