What do sound waves, light waves, and ocean waves all have in common?A.
They all transfer energy.

B.
They are all electromagnetic waves.

C.
They all require a medium to travel.

D.
They are all mechanical waves.

Answers

Answer 1

Answer: The answer is option A

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Protons inside the nucleus of an atom are held together though they have the same charge because?
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2.The image below shows two nitrogen atoms. For these two atoms to form a stable molecule, N2, how many electrons would have to be part of covalent bonds?

Answers

D. 6 electrons

A single nitrogen atom has five electrons in its outer energy level to start, and will be most stable with an octet, or 8 electrons in its outer level.

Since N2 is a covalent bond, the lewis dot structure of N2 would have a triple bond. Each bond contains 2 electrons, so if it has a triple bond it contains 6 electrons.
Calculate the number of valence electrons of N2
N= 2x 5 = 10
N2 has a total of 10 valence electrons, to become stable each N atom needs 8 electrons.
So, therefore, 6 electrons would have to be a part of covalent bonds because they share 6 electrons in a triple bond.

Which step would help a student find the molecular formula of a compound from the empirical formula?Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Subtract the ratio of the actual mass of the compound to the empirical formula mass from the subscripts of the empirical formula.

Divide the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Add the ratio of the actual mass of the compound to the empirical formula mass to the subscripts of the empirical formula.

Answers

Answer : Option A) Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Explanation : To find molecular formula for a compound one needs to follow the below steps using the emphirical formula of that compound.

Step 1) Calculate the empirical formula mass of that compound

Step 2) Take the ratio of gram molecular mass by the empirical formula mass that was obtained in step 1.

Step 3) Multiply each of the subscripts within the empirical formula by the number that is calculated in step 2.

By following these easy steps one can find the molecular formula.

The step that would help a student finds the molecular formula of a compound from the empirical formula is by ‘Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.’

How many grams of copper, CU are there in 2.55mol of CU?

Answers

2.55 mol Cu* 63.54 g Cu / 1 mol Cu so you cancel mol Cu, leaving you with 2.55 * 63.54 g Cu /1 =162.027

Final answer:

To calculate the number of grams of copper (Cu) in 2.55 mol of Cu, multiply the number of moles by the molar mass of copper. The molar mass of Cu is 63.55 g/mol. Therefore, there are 162.05 grams of copper (Cu) in 2.55 mol of Cu.

Explanation:

To calculate the number of grams of copper (Cu) in 2.55 mol of Cu, we need to use the molar mass of copper. The molar mass of Cu is 63.55 g/mol. Therefore, 2.55 mol of Cu is equal to:

2.55 mol Cu × 63.55 g/mol = 162.05 g Cu

So, there are 162.05 grams of copper (Cu) in 2.55 mol of Cu.

Learn more about grams of copper in mol of Cu here:

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An example of a physical property of an element is the element’s ability to(1) react with an acid(2) react with oxygen(3) form a compound with chlorine(4) form an aqueous solution

Answers

Answer is: 4) form an aqueous solution.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change. Making aqueous solution is physical change (solvatation).

Element reactions with acids, oxygen and chlorine are chemical change (chemical reaction combustion), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change (exothermic reaction because energy is released).

4: Form An Aqueous Solution

This is the only answer that can be observed without testing gear and with the naked eye.... Hope I helped ^-^

Why do we increase the surface area of a solid when dissolving? a) to decrease the rate of dissolution
b) to decrease the temperature
c) to increase the rate of dissolution
d) to decrease the need for agitation

Answers

The correct answer is C. Increasing the surface area of a solid when dissolving, increases the rate of dissolution of the solid solute in the solvent. This happens because dissolving involves the collision of the surface

Answer:

c) to increase the rate of dissolution

Explanation:

List inconsistency of Dalton's atomic theory

Answers

It does not account for isotopes: As per Dalton's atomic theory, all atoms of an element have identical masses and densities. However, different isotopes of elements have different atomic masses (Example: hydrogen, deuterium, and tritium).

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