CHEMISTRY HIGH SCHOOL

Which of the following is a nonmetal?a. iron
b. silver
c. oxygen
d. copper

Answers

Answer 1
Answer: Iron, Silver and Copper are all metal. Only Oxygen in this specific choices is not metal. Oxygen is known to be the 3rd most abundant element in the Universe but the 1st most abundant element on earth by mass. And we all know that Oxygen is a very essential part in our daily living in this world, actually not only humans who need Oxygen but also some creatures like animals. Oxygen is represented as O in the periodic table and its atomic number is 8. 

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Identify the following as True or False? 1. The limiting reactant is the reactant that is completely consumed in a chemical reaction.
2. The reactant in excess is any reactant that occurs in a quantity greater than that is required to completely react with the limiting reactant.
3. The amount of product can be calculated based on the amount of limiting reactant.

Answers

Answer :

(1) The limiting reactant is the reactant that is completely consumed in a chemical reaction.  → True

(2) The reactant in excess is any reactant that occurs in a quantity greater than that is required to completely react with the limiting reactant.  → True

(3) The amount of product can be calculated based on the amount of limiting reactant. → True

Explanation :

Excess reagent : It is defined as the reactants not completely used up in the reaction.  The given moles are more than the required moles.

Limiting reagent : It is defined as the reactants completely used up in the reaction.  The given moles are less than the required moles.

Theoretical yield : It is calculated from the amount of the limiting reagent present in the reaction.

Actual yield : It is experimentally determined.

All the given statements are true.

Final answer:

The limiting reactant is the reactant that is completely consumed in a chemical reaction. The reactant in excess is any reactant that occurs in a quantity greater than that required to completely react with the limiting reactant. The amount of product can be calculated based on the amount of limiting reactant.

Explanation:

1. True. The limiting reactant is the reactant that is completely consumed in a chemical reaction. It determines the amount of product that can be formed.

2. True. The reactant in excess is any reactant that occurs in a quantity greater than that required to completely react with the limiting reactant.

3. True. The amount of product can be calculated based on the amount of limiting reactant using stoichiometry.

Learn more about Limiting reactant here:

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Why does an ion have an electrical charge?

Answers

An ion has an electrical charge because it either has more electrons than protons or it has more protons than electrons. Electrons, which are found in the shells of an atom, have a negative charge, while protons, found in the atom's nucleus, have a positive charge.

As ice transforms into steam, A)new molecules are formed. B)the types of atoms are changed. C)energy is absorbed by the molecules. D)the mass of the molecules is increased.

Answers

This is an example of a substance changing state, a physical change, the molecules are changed, but the atoms themselves do not change, just their arrangement, and the mass of the molecules is the same. Therefor energy is absorbed by the molecules, as energy is required to change the state or physicality of a molecule structure.Hope this helps. Let me know if you need additional help!

The answer is C) energy is absorbed by the molecules.

The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given amount to decay?I'm not quite sure how to set it up to even start working it? help would be appreciated! Thanks!!

Answers

t½=18.72days
therefore t¾=18.72+½ of 18.72
we have 18.72+9.36=28.08days

Which statement describes a concept included in the wave-mechanical model of the atom?

Answers

The wave-mechanical model of the atom was proposed by Erwin Schrodinger that combined the works of Bohr and de Broglie. The electron was a three dimensional wave circling the nucleus in a whole number of wavelengths allowing the waveform to repeat itself as a stable standing wave (it can absorb energy form a nearby source which is oscillating at a proper frequency) representing the energy levels of Bohr model. He also said that Broglie’s model was correct about the matter waves and the electrons are located in the atomic space according to standing wave frequencies.

Which energy transformation occurs when anelectrolytic cell is in operation?
(1) chemical energy → electrical energy
(2) electrical energy → chemical energy
(3) light energy → heat energy
(4) light energy → chemical energy

Answers

The correct answer is option 1. The operation in an electrolytic cell transforms energy from chemical energy to electrical energy. This is a cell which electrolysis occurs to produce electrochemical reaction and eventually producing an electric current.

Answer:

(2) electrical energy -> chemical energy

Explanation:

Castle learning

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