Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2? A. 2Na + Br2 --> 2NaBr B. NaBr --> Na + Br2 C. 2NaBr --> 2Na + Br 2 D. 2Na + Br2 → NaBr

Answers

Answer 1

Answer:

Answer:

A) 2Na + $Br_(2)$ = 2NaBr

Explanation:

As the problem says that you should find the balanced chemical equation for the synthesis of NaBr from Na and $Br_(2)$ , the reactants are Na and $Br_(2)$ and the product is NaBr, so it can be writen as:

Na + $Br_(2)$ = NaBr

Then you shoud balance the equation, it means that you should have the same number of each element in each part of the equation, so if you put a number 2 for the NaBr and the Na, the equation will be balanced:

2Na + $Br_(2)$ = 2NaBr

Answer 2

Answer: A. 2Na + Br2-->2NaBr.

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Alpha, beta, and gamma radiation are all examples of

Answers

Answer:

These all are example of ionizing radiations.

Explanation:

Alpha beta and gamma radiations are the examples of ionizing radiations. When an atom is an excited state and having high energy, the atom is in unstable state. The excess of energy is released by the atom to get the stability. The released energy is in the form of radiations which may include alpha, beta, gamma, X-ray etc.

Alpha radiations:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number 4 less than and atomic

number 2 less than the starting atom.

Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.

Beta radiations:

Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.

The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.

The sheet of aluminium is used to block the beta radiations.

Gamma radiations:

Gamma radiations are high energy radiations having no mass.

These radiations are travel at the speed of light.
Gamma radiations can penetrate into the many materials.
These radiations are also used to treat the cancer.
Lead is used for the protection against gamma radiations because of its high molecular density.
The lead apron are used by the person when treated with gamma radiations.
Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings.

Answer:

Explanation:

Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO 2Hg + O2 The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2? 3.906 7.813 15.63 73.87

Answers

Answer:

15.63

Explanation:

250g O2 x 1 mol O2 x 2mol HgO / 32 g O2 x 1 mol O2

Plz can someone help with this I don't understand how the answer is 3000dm3
Thanks

Answers

Combustion of octane is:
C8H18 + 25/2O2 -> 9H2O + 8CO2

You are given 10 moles of octane and you are required to find the volume of octane

10 moles C8H18 (25/2 moles O2/ 1 mole C8H18) = 125 moles O2

V = 125 moles O2 ( 24 dm3 / 1 mole of gas)
V = 3000 dm3

Given the balanced equation representing a redox reaction:2Al + 3Cu2+ --> 2Al3+ + 3Cu
Which statement is true about this reaction?
(1) Each Al loses 2e- and each Cu2+ gains 3e-
(2) Each Al loses 3e- and each Cu2+ gains 2e-
(3) Each Al3+ gains 2e- and each Cu loses 3e-
(4) Each Al3+ gains 3e- and each Cu loses 2e-

Answers

From the given balanced chemical reaction, it can be seen that each aluminum atom gains loses 3 electrons. Also, each copper atoms gains 2 electrons. The choice that would best give us the described scenario above is choice number 2. That is Each Al loses 3e- and each Cu gains 2e-.

The correct answer is option (2) i.e. Each Al loses 3e- and each Cu^2+ gains 2e-When an atom X, loses an electron, it becomes, X^1+When an atom X, loses two electrons, it becomes, X^2+When an atom X, gains an electron, it becomes, X^1-When an atom X, gains two electrons, it becomes, X^2-So, Here, 2Al + 3Cu^2+ --> 2Al^3+ + 3Cu,When each Al, loses three electrons, it becomes, Al^3+When each Cu^2+, gains two electrons, it becomes, Cu^2+^2- = Cu

Activation energy is only required to start an exothermic reaction. True or False?

Answers

Answer:

False

Explanation:

Activation energy is the minimum amount of energy required for a reaction to proceed. Hence, for a reaction (endothermic and exothermic) to occur/proceed, the activation energy must be met. This is because, a reaction is only endothermic or exothermic when the reaction has started/occurred. If the activation energy is not produced, there will be no reaction in the first place.

NOTE: Exothermic reaction is a reaction that involves the release of energy (heat or light) into the surroundings. While endothermic reaction is a reaction that requires the input of energy or it absorbs energy from the environment.

false it is only not required when you have a catalyst

Choose all of the examples where there would be an increase in the electric or magnetic force

Answers

Answer:

Explanation:

1) Increase the amount of charge on each object

2) Decrease the distance between each object

3) Increase the mass of the objects.

just colmpeated this in usa test prep 100% correct

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