CHEMISTRY HIGH SCHOOL

Question: (a) Evaporation of water is a _____ change. A) Physical B) Chemical C) Biological D) None of the above

Answers

Answer 1
Answer:

Answer:

Chemical change

Explanation:

This type of change is reversible, as the water vapor can condense back into liquid water under the right conditions.

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How many grams are in 0.02 moles of beryllium iodide, Bel2?

Answers

This set up of a conversion table should show you that if you multiply the grams of BeI2 times .02 moles, it equals 5.256 g (your answer) 

Compounds that are formed when two or more atoms combine to form molecules are called?

Answers

When two or more atoms of the same elements combine to form molecules of a compound, the compound formed is said to be molecular.

Two atoms of an element can become chemicallybonded to form a molecular compound.

For example, two atoms of oxygen combine, the result would be a molecule of oxygen. Two atoms of chlorine combining will result in a molecule of chlorine.

When the combination is that of atoms of different elements, what will result is an ordinary compound.

More on molecular compounds can be found here: brainly.com/question/25228419?referrer=searchResults
Compounds that are formed when two or more atoms combine to form molecules are called Molecular Compounds.

Calculate the mass in grams of 7.88 mol of RbMnO4

Answers

Molar mass RbMnO₄ = 204.40 g/mol

1 mole ---------- 204.40 g
7.88 mole ------ ?

mass = 7.88 * 204.40 / 1

mass = 1610.672 g

hope this helps!

A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state.This emitted energy can be used to determine theA) mass of the sample
B) volume of the sample
C) identity of the element
D) number of moles of the element

Answers

The answer is C. The specific amount of energy emitted when electrons jump from excited states to the ground state refers to emission spectrum. The energy is emitted in the form of photons, and the photons have very specific wavelengths (energy) that correspond to the energy gaps between the excited states and the ground state. The specific wavelengths of light emitted are referred to as the "emission spectrum," and each element produces a different emission spectrum. Thus, this emitted energy can be used to identify the element from which your sample was taken.

Answer:

C.

Explanation:

What is the mass in grams of 2.0 moles of NO2

Answers

Answer:

The mass of 2 moles of NO₂ is 92 grams.

Explanation:

Given that,

Number of moles, n = 2 moles

We need to find the mass of 2 moles of NO₂. We know that the number of moles is given by the formula as :

n=(m)/(M)

m is the given mass

M is the molar mass of NO₂, M=14+16* 2=46\ g

m=n* M\n\nm=2* 46\n\nm=92\ g

So, the mass of 2 moles of NO₂ is 92 grams. Hence, this is the required solution.
Molar mass NO₂ = 46.0 g/mol

1 mole -------- 46.0 g
2.0 moles ----- ?

Mass (NO₂) = 2.0 x 46.0 / 1

=> 92.0 g

hope this helps!

The two forms of oxygen, O2(g) and O3(g), have(1) different molecular structures and identical properties
(2) different molecular structures and different properties
(3) identical molecular structures and identical properties
(4) identical molecular structures and different properties

Answers

Answer: option (2) different molecular structures and different properties.


Justification:


O₂(g) and O₃(g) are different forms of oxygen in gaseous state. That is what is called allotropes.


Allotropes are forms of the same element, in the same physical state (solid, liquid or gas), that have different structures and different properties.


O₂ (diatomic oxygen) and O₃ (ozone) are both gases at room temperature, but one molecule has 2 atoms and the other has 3 atoms. That make them different in structure and properties.


Another example of allotropes is graphite and diamonds.

Answer:

different molecular structures and different properties

Explanation:

The two forms of oxygen, O2(g) and O3(g) have different molecular structures and different properties
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