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Usimov [2.4K]
2 years ago
14

Which of the following substances has the characteristics shown in the chart? A. homogeneous mixture B. compound C. solution D.

heterogeneous mixture
Chemistry
1 answer:
notsponge [240]2 years ago
6 0
Lol I need help on this too
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A sample of calcium oxide (CaO) has a mass of 2.80 g. The molar mass of CaO is 56.08 g/mol. How many moles of CaO does this samp
Molodets [167]

Answer is "0.05 mol".

<em>Explanation;</em>

We can do calculation by using a simple formula as

n = m/M

Where, n is the number of moles of the substance (mol), m is the mass of the substance (g) and M is the molar mass of the substance (g/mol).

Here,

n = ?

m = 2.80 g

M = 56.08 g/mol

By substitution,

n = 2.80 g /56.08 g/mol

n = 0.0499 mol ≈ 0.05 mol

4 0
3 years ago
Read 2 more answers
The alkali metals play virtually the same general chemical role in all their reactions. (b) How is it based on atomic properties
vfiekz [6]

b) It is based on atomic properties as alkali metals requires 7 more electrons to complete their outer orbit. And they try to give those electrons to other elements to obtain noble gas configuration.

Noble gases are the gases which do not react easily with anything. They are also called as Inert gases, and belongs to group 18 of the periodic table.

Alkali metals are the substances which are found in Group I of a periodic table. Mostly the elements which are present are:

  • Lithium (Li)
  • Sodium (Na)
  • Potassium (K)
  • Rubidium (Rb)
  • Cesium (Cs)
  • Francium (Fr)

Properties of alkali metals are:  Soft, shiny reactive metals. They are soft enough to cut with knife. Metals react with water and air quickly and gets tarnish, so pure metals are stored in container by dipping them in oil to prevent oxidation.

To know more about Alkali metals, refer to this link:

brainly.com/question/18153051

#SPJ4

6 0
1 year ago
An aluminum soft drink can is approximately 0.55 moles of aluminum. How many
Morgarella [4.7K]

Explanation:

Round 87.073 meters to 3 significant figures. write your answer in scientific notation. step 1: 87.073 rounds to step 2: write scientific notation : meters...

3 0
2 years ago
Can snow have viscosity?
iren [92.7K]

Answer: Yes

Explanation: It can because snow is wet and anything that is wet can

4 0
3 years ago
Read 2 more answers
How many moles are in 7.00E24 atoms of Ca?
iris [78.8K]

Explanation:

In chemistry, a mole is the base unit of the amount of substance in a system containing elementary entities (atoms, molecules, ions, electrons), and one mole of substance corresponds to the Avogadro's constant or 6.023 \ \times \ 10^{23}  entities. The stoichiometry equation that relates the amount of substance into the measurement in moles is

                                                           n \ = \ \displaystyle\frac{\alpha}{N_{A}},

where n is the number of moles, \alpha is the amount of substance and N_{A} is the Avogadro's constant.

Therefore,

                                           n \ = \ \displaystyle\frac{7.00 \ \times \ 10^{24} \ \text{atoms}}{6.023 \ \times \ 10^{23} \ \text{atoms mol}^{-1}} \\ \\ n \ = \ 11.624 \ \text{mol}.

3 0
2 years ago
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