What happens when a catalyst is used in a reaction?.

1 answer:

6 0

A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without being used up in the reaction. After the reaction occurs, a catalyst returns to its original state and so catalysts can be used over and over again.

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Which of the following causes the formation of ionic bonds

pantera1 [17]

Answer: b. One atom transferring electrons to another atom

Explanation: An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.

Covalent bonds are formed by sharing of electrons between non metals

For example, In calcium iodide the one electron from calcium metal gets transferred to iodine atom and thus form an ionic bond to give $CaI_2$

Electronic configuration of calcium:

$[Ca]=1s^22s^22p^63s^23p^64s^2$

Calcium atom will lose two electron to gain noble gas configuration and form calcium cation with +2 charge.

$[Ca^{2+}]=1s^22s^22p^63s^23p^6$

Electronic configuration of iodine:

$[I]=1s^22s^22p^63s^23p^64s^23d^{10}4p^5$

Iodine atom will gain one electron to gain noble gas configuration and form iodide ion with -1 charge.

$[I^-]=1s^22s^22p^63s^23p^64s^23d^{10}4p^6$

7 0

3 years ago

Help please!!!! I need to know the answer to this problem it would mean a lot if u helped :))

inn [45]

Nobel gas, it is in the last row of the periodic table and therefore is a noble gas

4 0

3 years ago

Diffrentiate between electrolyric cells and galvanic cells

Scilla [17]

The different is that the galvanic cell converts chemical energy into the electrical energy and the electrolytic cell coverts electrical energy into chemical energy

7 0

3 years ago

Help!!!plz help me with this question

denpristay [2]

Answer:

<h3>ENVIRONMENT</h3>

Explanation:

I HOPE IT HELPS :)

3 0

3 years ago

The amount of gas that occupies 36.52 L at 68.0°C and 672 mm Hg is __________ mol.

ASHA 777 [7]

We assume that this gas is an ideal gas. We use the ideal gas equation to calculate the amount of the gas in moles. It is expressed as:

PV = nRT
(672) (1/760) (36.52) = n (0.08206) ( 68 +273.15)
n = 1.15 mol of gas

Hope this answers the question. Have a nice day.

7 0

3 years ago