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3 years ago

If a flame is yellow is it considered dirty or clean?And to make it blue do you add or take away air?

Chemistry

1 answer:

Step2247 [10]3 years ago

8 0

It is clean and is blue when you take away air hope i helped.

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Determine the number of protons, electrons, neutrons, valence electrons and valency in Oxygen atom (O) and Oxide ion (O2-). Comp

wolverine [178]

Answer:

Atom (O) Ion (O²⁻)

Protons 8 8

Electrons 8 10

Neutrons 8 8 ← only for the oxygen-16 isotope.

* The number of neutrons depends on the specific isotope. It is equal to the mass number of the isotope less the number of protons.

Explanation:

Oxygen is the element with atomic number 8. That means that the oxygen atoms have 8 protons.

Protons have relative positive charge equal to +1 and electrons have relative negative charge -1: same magnitude opposite sign.

Thus, the neutral oxygen, O, has also 8 electrons and 8 protons.

As per the number neutrons it depends on the specific isotope.

The isotopes are identified by the mass number, which is the number of protons plus neutrons. For instance, oxygen-16 isotope has mass number 16, 8 protons and 8 neutrons, while oxygen-15 isotope has mass number 15, 8 protons and 7 neutrons.

Oxide ion O²⁻ is the oxygen ion with -2 charge, meaning that it has 2 more electrons than protons. Then, it has 8 protons and 10 electrons, again the number of neutrons depend of the specific isotope.

The stability of an atoms or ion refers to its trend to remain in the same state or react to form another species. The ions O²⁻ are less stable than the neutral atoms O, because the negative charge will be attracted to any positive ion so ti will react faster than the neutral oxygen atom (O).

8 0

4 years ago

How many valence electrons does B (boron) have? A. 13 B. 5 C. 10 D. 3

pshichka [43]

Answer:

Boron has 3 valence electrons

8 0

3 years ago

How many liters of water are needed to dissolve 75.0 grams of NaOH to prepare a 1.00-M solution?

Pepsi [2]

Answer:

About 500

Explanation:

Bc i used my calc

4 0

3 years ago

The mechanical advantage of a door knob that allows you to move a boli

taurus [48]

Answer:

the mechanical advantage is 50 because 0.50/0.01=50

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4 years ago

A chemist measures the energy change Delta H during the following

Ann [662]

Answer: 1) endothernic

2) Yes absorbed

Explanation:

Decomposition is a chemical reaction in which one reactant gives two or more than two products. All decomposition reactions are endothermic reactions as energy is absorbed to break the bonds.

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and $\Delta H$ for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

5 0

3 years ago