CHEMISTRY HIGH SCHOOL

What type of state is glass? please explain about it.

Answers

Answer 1
Answer: On a small time scale, glass is in a solid state. When you look at a window, it appears solid.

However, it has been observed that over a very long period, glass starts to act like a liquid.

It can thus be characterized by two different states depending on the time scale considered.
Answer 2
Answer: I think the other answer is incorrect. Glass being a liquid is a misconception, from when glassmaking was imperfect and windows were thicker at the bottom of the pane than the middle. But that was from when the glass was MADE, after being heated and put into a liquid form.

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Which of the following is an oxidation-reduction reaction?Fe2O3 + 3CO mc009-1.jpg 2Fe + 3CO2 CuSO4 + 2NaOH mc009-2.jpg Cu(OH)2 + Na2SO4 2NaOH + H2CO3 mc009-3.jpg Na2CO3 + 2NaOH Pb(NO3)2 + Na2SO4 mc009-4.jpg 2NaNO3 + PbSO4
If you have earned income, which of the following retirement devices must you contribute to, by law? A. IRA B. Pension plan C. Social security (FICA) D. Vesting plan
How many protons does the element cobalt (Co) have? 27 32 58.93 59
1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus, a. the strong nuclear force is much greater than the electric force. b. the electric force is much greater than the strong nuclear force. c. the strong nuclear force equals the electric force. d. the strong nuclear force and the electric force are both attractive. 9. Uranium-238 undergoes alpha decay. Therefore, uranium-238 will a. remain stable. b. change into a different element altogether. c. emit neutral particles and no energy. d. none of the above
It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the body’s mechanism for eliminating this heat. What mass of water would have to be evaporated through perspiration to rid the body of the heat generated during 2 hours of exercise? (The heat of vaporization of water is 40.6 kJ/mol.)

Which quantity identifies an element?1. Atomic number
2. Mass Number
3. total number of neutrons in an atom of the element
4. total number of valence electrons in an atom of the element

Answers

Answer is (1) - atomic number.

Atomic number is unique for an element. The elements in periodic table are organized according to the atomic number of elements. Another thing is atomic number is equal to number of protons of the element.

Mass number can be defined as the sum of proton number and neutron number. Although proton number is same for the atoms of same element, the neutron number can be varied.The atoms which has same atomic number but have different number of neutrons are called isotopes. Hence, mass number not enough for the identification of elements.

Only the neutron number is also not enough for the identification of elements. But if you have both mass number and the neutron number, then you can find atomic number by using mass number = proton number + neutron number equation. Then you can identify the element.

If you have total number of electrons of the element when it is in its neutral state you can identify the element because at neutral state number of electrons = number of protons (atomic number). But if only the valence electrons are given then you cannot find the element exactly because usually all elements in certain group have same number of valence electrons.
Atomic number identifies an element. Atomic number is the  number of protons in the atom of an element, which is different for every element.

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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Which is an example of a response?a. water lost from the lungs during breathing
b. ivy growing around the pole of a fence
c. the angle of the sun changing during the day
d. outside temperature dropping at night

Answers

The anwser is B.ivy growing aroung the pole of a fence I just took this test

A neutral atom must have the same number of neutrons and electrons true or false

Answers

False .... A neutral atom needs the same number of protons and electrons

Which of the following is not an example of chemical weathering?a. the oxidation of iron
b. the formation of clay
c. the reaction of limestone with acid rain
d. the breaking of a rock into smaller pieces

Answers

D. is not chemical weathering.
We know this because when iron oxides, it is reacting with oxygen in the air, with is therefore a chemical change.
When clay forms, it's from the chemical deposition of rocks like granite, which makes it a type of chemical weathering.
Finally, limestone reacting with acid rain is a chemical change, which makes it chemical weathering.
A rock being broken down does not change the chemical structure of the rock, so it is a physical change, and physical weathering, not chemical.

The answer is D i just took the test and got it correct!

How many grams of iron metal do you expect to be produced when 265 grams of an 84.5 percent by mass iron (II) nitrate solution react with excess aluminum metal? Show all of the work needed to solve this problem. 2Al (s) + 3Fe(NO3)2 (aq) yields 3Fe (s) + 2Al(NO3)3 (aq)

Answers

The balanced reaction is:

2Al (s) + 3Fe(NO3)2 (aq) = 3Fe (s) + 2Al(NO3)3 (aq)

We are given the amount of iron (II) nitrate solution with its purity. This will be the starting point of our calculation.

265 (.845) gram iron (II) nitrate (1 mol Fe(NO3)2 / 179.85 g Fe(NO3)2) ( 3 mol Fe / 3 mol Fe(NO3)2) (55.85 g Fe / 1 mol Fe) = 69.54 g Fe
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