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3 years ago

PLEASE HELP! THIS A TIMED QUIZ!!

Chemistry

2 answers:

Advocard [28]3 years ago

6 0

Answer: D

Explanation:

damaskus [11]3 years ago

5 0

The answer to your question is D

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TTILA U.

horrorfan [7]

Answer:

Explanation:

If it is said that an electric bulb contains 60 watts, that implies that the electric bulb will have to consume a required amount of energy of about 60 joules in a second.

Mathematically:

Power rating = Energy consumed ÷ time

The electronic configuration typically implies the arrangement of electrons in atomic orbitals. The electronic configuration of Calcium (Ca) in it subshell method is:

$\mathbf{Ca (20) = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 }$

4 0

3 years ago

When magnesium reacts with chlorine, magnesium ions, Mg2+, and chloride ions, Cl−are formed. In this reaction, magnesium atoms A

Slav-nsk [51]

<u>Answer:</u> In the reaction, magnesium atoms lose electrons.

<u>Explanation:</u>

An ionic compound is defined as the compound which is formed when electron gets transferred from one atom to another atom. These are usually formed when a metal reacts with a non-metal or a metal reacts with a polyatomic ion or a reaction between two polyatomic ions takes place.

Magnesium is 12th element of the periodic table having electronic configuration of $1s^22s^22p^63s^2$

This element will loose 2 electrons to form $Mg^{2+}$ ion

Chlorine is 17th element of the periodic table having electronic configuration of $1s^22s^22p^63s^23p^5$

This element will gain 1 electron to form $Cl^-$ ion

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

The ionic compound formed is $MgCl_2$

Hence, in the reaction, magnesium atoms lose electrons.

5 0

4 years ago

The calculated yield for water was 176 g but the measured yield what is 140 g what percent is the yield

IrinaK [193]

Divide measured yield by calculated yield
140/176 = 79.55%

6 0

4 years ago

what is the molarity of a solution that contains 1.25 moles of K2SO4 dissolved into water to make 1.5 liters of solution?

Elena L [17]

Answer: 0.8 M

Explanation:

molarity = (moles of solute)/(liters of solution) = 1.25/1.5 = 0.8 M

7 0

3 years ago

In what area of the titration curve for phosphoric acid (h3po4) is the molecule fully deprotonated?

Arada [10]

The titration curve should have flat regions centered around each of the

three halfway points (buffer zones) and sharp increases in pH around the

equivalence points.

Initial pH

This is determined by the most acidic of the Ka values and the initial

concentration of the acid. (Same as a monoprotic acid)

Half-way points

At each halfway point, the pH = pKa of the group you are titrating. At this point in

the titration curve, we are in a buffering region, and the curve will be relatively

flat.

Equivalence points

At each equivalence point, the pH is the average of the pKa values above and

below. At the last equivalence point (the endpoint), the pH is determined by the

Kb of the conjugate base of the weakest acid.

Plotting the titration of 100 mL of 0.10 M phosphoric acid with 1.0 M NaOH.

H3PO4 + H2O  H2PO4

+ H3O+

Ka1 = 7.5 x 10-3

H2PO4

+ H2O  HPO4

2- + H3O+

Ka2 = 6.2 x 10-8

HPO4

2- + H2O  PO4

3- + H3O+

Ka3 = 4.2 x 10-13

Plot these points and connect them to determine the titration curve of phosphoric acid. The curve should be relatively flat around each of the halfway points when we are in a buffering region.

The titration curve should have flat regions centered around each of the

three halfway points (buffer zones) and sharp increases in pH around the

equivalence points.

For more information on the titration curve click on the link below:

brainly.com/question/3130161

#SPJ4

4 0

2 years ago