CHEMISTRY HIGH SCHOOL

Everything on earth is made of

Answers

Answer 1
Answer: - - Everything on earth is made of matter.Matter is all around you, everything you see and touch is matter. 
Answer 2
Answer: Everything is made out of matter. More specifically atoms.

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Calculate the molar mass
FeCl3
Fe2(SO4)3
PbO
PbO2
Pb3O4

Answers

To find molar mass: look for each element on the table and find their atomic masses. Then add each atomic mass to find the molar mass. If there is a subscript then that means that there is 3 of that number. For atomic mass round to the nearest hundredths
FeCl3= 162.2
Fe2(SO4)3= 354.88
PbO=223.2
PbO2 = 239.2
Pb3O4=685.6

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

The answer is option A

The minimum energy required to start a reaction is: enthalpy (E1) enthalpy (E2) activation energy (A.E.) heat of reaction

Answers

The answer is activation energy. This is the minimum amount of energy needed to start a reaction. This is introduced by Svante Arrhenius. Also, it is the maximum amount of energy required. Activation energy can also be thought of the energy barrier.

The minimum energy required to start a reaction is called activation energy (A.E.).

(Option C)

What is activation energy?

Activation energy is the energy barrier that reactant molecules must overcome to transform into products during a chemical reaction.

It is the energy difference between the energy levels of the reactants and the transition state on the reaction's potential energy diagram.

Enthalpy (E1 and E2) and heat of reaction are related to the energy changes during the course of a reaction but are not directly related to the energy barrier required to initiate the reaction.

Enthalpy (H) refers to the total heat content of a system, while heat of reaction (ΔH) represents the energy difference between the products and reactants at constant pressure.

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A container can hold 65g of water. circle the conversion factor needed to find the mass of water that 5 identical containers can hold

Answers

Than you for posting your question here. I hope the answer helps. 

The answer as to be grams (g) since you it is aske for mass. What you have for units is 1/g. 

Very close. The factor is 5. 
answer is 5 * 65 g of water.

How many moles are in 30 grams of H3PO4?

Answers

Mass = Moles x GFM

mass = 30g so;

30    = mol x GFM

To calculate the GFM, you require a data booklet or similar.
Mine tells me that the GFMs are:

H: 1               H₃ so 3 x 1 = 3
P: 31             P  so 1 x 31= 31
O:16             O₄ so 4 x 16 = 64 
                              GFM = 64 + 31 + 3 = 98

30 = 98 x mol

mol = 30 / 98

mol = 0.31 mol

Final answer:

To find the number of moles in 30 grams of H3PO4, divide the mass by the molar mass. In this case, there are 0.306 moles of H3PO4.

Explanation:

To determine the number of moles in 30 grams of H3PO4, we need to use the molar mass of H3PO4. The molar mass of H3PO4 is 98.0 g/mol.

We can use the following conversion factor to convert grams to moles: 1 mole = molar mass (in grams).

Therefore, the number of moles in 30 grams of H3PO4 is calculated as:

30 grams x (1 mole / 98.0 grams) = 0.306 moles of H3PO4.

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A sample of matter must be copper if(1) each atom in the sample has 29 protons(2) atoms in the sample react with oxygen
(3) the sample melts at 1768 K
(4) the sample can conduct electricity

Answers

The answer is 1. Copper is an element with sign Cu and atomic number 29 which means that there are 29 protons in this element. It is a soft, flexible, and elastic metal with very extraordinary thermal and electrical conductivity. A newly unprotected exterior of pure copper has a reddish-orange color.

Final answer:

Copper samples must have 29 protons, react with oxygen, melt at 1768 K, and conduct electricity.

Explanation:

In order for a sample of matter to be copper, it must meet certain criteria:

  1. Each atom in the sample must have 29 protons. Copper has an atomic number of 29, which means it has 29 protons in its nucleus.
  2. The atoms in the sample must react with oxygen. Copper undergoes a chemical reaction with oxygen to form copper oxide.
  3. The sample must melt at 1768 K. Copper has a melting point of 1768 K, which is significantly higher than room temperature.
  4. The sample must be able to conduct electricity. Copper is a good conductor of electricity due to its free electrons.

Therefore, if a sample of matter meets all of these criteria, it can be identified as copper.

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A student had two dilute, colorless solutions, HCl(aq) and NaOH(aq), which were at the same temperature. The student combined the solutions, and the reaction represented above occurred. Which of the following results would be evidence that a chemical reaction took place
A rock weighing 75.0g is placed in a graduated cylinder displacing the volume from 31.4 ml to 36.5ml. What is the density of the rock in grams /cubic centimeter.