1. Is O2 a compound? Explain.2. Is O2 a molecule? Explain.

3. State the law of conservation of matter, and give an example demonstrating its meaning.

4. Electrolysis is used to break liquid water into hydrogen and oxygen gas. If I begin with 10 grams of liquid water, will the total mass of the two gases be greater than, less than, or equal to 10? Why?

5.What kind of observations can indicate a transfer of energy has taken place in a reaction?

Answers

Answer 1

Answer: 1. O2 is not a compound because it only contains one or more type of the same element atom.
2. O2 is a molecule because a molecule is one or more of the same element atom.
3. The law of conversion is that the mass of the system will stay the same when transfer takes place. Like if you had an equation O+H2—> H2O the mass will remain the same.

4. It will be equal to 10 because of law of conservation of matter.

5. One observation can be that the compound, reaction you’re observing, has change states.

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How many moles are in 2.0 grams of Na?

Answers

Answer:

Explanation:

Sodium metal has a molar mass of

22.99

What weather conditions would you expect on the windy side of a mountain?

Answers

you would expect low humidity and low air pressure because as you go higher into the atmosphere the less air you get because your going into outter space. No matter what amount of clothes you wear as you get higher and higher you get colder and colder

Mercury is an element. Which of the following would be the same for all atoms of mercury? A. the number of protons

B. the number of neutrons

C. the number of electrons

D. the total number of protons and neutrons

Answers

The number of protons

for all atoms of mercury will remain the same while different isotopes may have different number of neutrons.

Explanation:

Atoms should have equal numbers of protons and electrons. In our example, an atom of thirty six|chemical element, it should contain thirty six electrons since it contains 36 protons. Electrons are organized around atoms in a very special method.

Alpha effect on atomic mass and effect on atomic number

Answers

Question: alpha effect on atomic mass and effect on atomic number

Answer: the atomic mass number decreases by four and the atomic number decreases by two

Explanation: When an alpha particle is emitted from the nucleus, the nucleus loses two protons and two neutrons and creates a new element

question answered by

(jacemorris04)

By usuning usfal numbers

explain the difference of valence electron behavior between ionic bonds and covalent bonds. Give an example of each type of bond using the three main groups from the periodic table.

Answers

Ionic bonds are typically weak, non-directional primary bonds between atoms, where one cation donates its valence electrons to one or more anions. They often occur between a metal and a non-metal such as table salt (NaCl). Materials made from ionic bonds tend to be more ductile than covalent ones but are still more brittle than metallic bonded ones.
Covalent bonding is a strong type of primary bond that is highly directional as the atoms share their valence electrons. This makes the material less ductile. An example of this is carbon-carbon bonds in diamond.

How many atoms does a molecule of sodium chloride contain?

Answers

2, for every one Na you will have 1 Cl.

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