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3 years ago

Which of the following best describes alternating current? ________

Chemistry

2 answers:

Alenkasestr [34]3 years ago

7 0

B. Current in which charges change direction

Natali [406]3 years ago

3 0

B. A current in charges change direction

Explanation: an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.

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Neon is an inert gas and has the atomic number of 10. Which of the following correctly depicts its electron configuration? 1s22d

weeeeeb [17]

I think the answer is 1s²2s²2p⁶. Since neon has an atomic number of 10, we know that it needs to have 10 electrons and since it is in the second row it cannot have any d electrons which makes the first option incorrect. The second option is incorrect because the 2s⁴ can't exist since s orbitals can only hold 2 electrons. The fourth option cannot be right because it again neon cannot have d electrons due to it being in the second row.

I hope this helps. Let me know if anything is unclear.

7 0

4 years ago

How many moles of pb(so4) can be made from the reaction of 330.g Li2SO4

Marina CMI [18]

The answer is 310 g LiNO3

:)I hope i could help!

7 0

3 years ago

Which of the following reactions Shows a chemical change producing a gas? APEX

Nina [5.8K]

Answer: $2CH_3OH(l)+3O_2(g)\rightarrow2CO_2(g)+4H_2O(l)$

Explanation: A chemical change is a reaction in which chemical composition of the substance changes. Some bonds are broken and some new bonds are formed.

The reactants are written in terms of their chemical formula on the left hand side and the products are written in terms of their chemical formula on right hand side with a arrow in between. The chemical symbols are followed by their physical states such as (l) for liquid, (s) for solid, (g) for gas and (aq) for aqueous.

Thus the only reaction producing a gas is $2CH_3OH(l)+3O_2(g)\rightarrow2CO_2(g)+4H_2O(l)$

4 0

4 years ago

Read 2 more answers

Need help I don’t understand this at all need to show my work and strategy it’s stoichiometry gram to gram please help

laila [671]

Answer:

781×10¯² g of MgCl₂.

Explanation:

The balanced equation for the reaction is given below:

Mg + 2HCl —> MgCl₂ + H₂

Next, we shall determine the mass of HCl that reacted and the mass of MgCl₂ produced from the balanced equation. This is illustrated below:

Molar mass of HCl = 1 + 35.5

= 36.5 g/mol

Mass of HCl from the balanced equation = 2 × 36.5 = 73 g

Molar mass of MgCl₂ = 24 + (35.5×2)

= 24 + 71

= 95 g/mol

Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g

SUMMARY:

From the balanced equation above,

73 g of HCl reacted to produce 95 g of MgCl₂.

Finally, we shall determine the mass of MgCl₂ produced by the reaction of 6 g of HCl. This can be obtained as follow:

From the balanced equation above,

73 g of HCl reacted to produce 95 g of MgCl₂.

Therefore, 6 g of HCl will react to produce = (6 × 95)/73 = 781×10¯² g of MgCl₂.

Thus, 781×10¯² g of MgCl₂ were obtained from the reaction.

4 0

3 years ago

How does your pattern of breathing change when you exercise and then rest ?

Paladinen [302]

Your pattern of breathing increases, making it faster than usual, when you're exercising because you're pushing your body to work harder and speeding up your heart rate making you tired.

When you're resting your breathing pattern should be steady and normal since you aren't doing anything that requires lots of body work or something that would make you out of breath.

Hope this helps,

Davinia.

7 0

4 years ago