A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.

Answers

Answer 1

Answer: The scientist will repeat the experiment to make sure thathis results are reliable.

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Is friction better on a hard or smooth surface?

Answers

Answer:

Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

Explanation:

Answer:

Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them.

Explanation:

Which statement is true? Select one: a. Hydroelectric power, a nonrenewable resource, is generated from moving water. b. Oil, a nonrenewable resource, is processed to make jet fuel. c. Propane, a renewable resource, is used in some heating systems. d. The energy from the sun, a nonrenewable resource, can be converted to electricity in solar cells.

Answers

a) False.

Hydroelectric power is arenewable source of energy generated from moving water

b) True.

Oil is a non-renewable source used to make jet fuel

c) False

Propane is a byproduct of natural gas which is a non-renewable source of energy

d) False

Energy from the sun is a renewable source of energy

Ans : b) True

Answer:

Explanation:

Which of the following choices represents a balanced chemical equation? Ca3(PO4)2 + 6SiO2 → P4O10 + 3CaSiO3 2Ca3(PO4)2 + 6SiO2 → P4O10 + 6CaSiO3 2Ca3(PO4)2 + 3SiO2 → 2P4O10 + 2CaSiO3 3Ca3(PO4)2 + 2SiO2 → P4O10 + 4CaSiO3

Answers

$2Ca_3(PO_4)_2 + 6SiO_2$ -> $P_4O_(10) + 6CaSiO_3$ Hence, option B is correct.

What is a balanced equation?

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total oxidation numbers is the same for both the reactants and the products.

$2Ca_3(PO_4)_2 + 6SiO_2$ -> $P_4O_(10) + 6CaSiO_3$ represents a balanced chemical equation.

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Here is the correct answer: 2Ca3(PO4)2 + 6SiO2 -> P4O10 + 6CaSiO3

The chemical properties of an element are largely determined by itsa. number of energy levels.
b. period number.
c. number of protons.
d. number of valence electrons.

Answers

The chemical properties of an element are largely determined by the number of valence electrons. Thus option D is correct.

what are valence electron ?

Valence electrons an atom is defined as the number of electron which lose or gain the nearest noble gas or inert gas electronic configuration.

The valence electrons are the main part of chemical reactions as these contain more energy as compared to the electrons present in inner orbits.

The number of valence electrons present helps to determine the chemical properties of element like valence or valency, bonds with other elements.

It also show a picture of the mechanism of bond formation of an atom, the number of unpaired electrons and how many atoms can take part.

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The chemical properties of an element are largely determined by its number of valence electrons. The answer is letter D. The rest of the choices do not answer the question above.

Given the boiling point of water which is 81 degrees Celsius, calculate the atmospheric pressure.

Answers

The problem ask to calculate of find the atmospheric pressure of water having a boiling point of 81 degree. Base on my calculation i came up with an answer of 292 mm HG. I hope you are satisfied with my answer and feel free to ask for more if you have clarification and question

How many grams of aluminum chloride are needed to react completely with 1.084g lithium sulfide?

Answers

Molar mass :

Li₂S = 45.947 g/mol

AlCl₃ = 133.34 g/mol

3 Li₂S + 2 AlCl₃ = 6 LiCl + Al₂S₃

3 * 45.947 g Li₂S ----------> 2 * 133.34 g AlCl₃
1.084 g Li₂S ----------------> ?

Mass Li₂S = 1.084 * 2 * 133.34 / 3 * 45.947

Mass Li₂S = 289.08112 / 137.841

Mass Li₂S = 2.0972 g

hope this helps!

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Which of the following is the first step toward proposing solutions effectively?a. Determine the desired outcome. b. Propose a possible solution. c. Act on a possible solution. d. Identify the unresolved problem or dilemma.