What is the mass of a rock if a 12 N unbalanced force acting on it causes the rock to accelerate at 4 m/s²?

Give the symbol for the atom that corresponds to each electron configuration:

stepan [7]

Answer:

Na

N

Si

O

K

Ti

Explanation:

To know what symbol corresponds to the electron configurations, we just have to count the number of electrons.

⇒1s² 2s² 2p6 3s1

This means there are 2 electrons on the first shell

8 electrons on the second shell

and 1 electron on the third shell

in total there are 11 electrons ⇒ this means the atom number is 11

If we look at the periodic table to atom number 11 we'll see that this is Sodium (Na).

⇒ 1s² 2s² 2p³

This means there are 2 electrons on the first shell

and 5 electrons on the second shell

So 7 electrons in total ⇒ this means the atom has atom number 7

⇒Nitrogen (N)

⇒ 1s² 2s² 2p6 3s² 3p²

This means there are 2 electrons on the first shell

There are 8 electrons on the second shell

There are 4 electrons on the third shell

So there are 14 electrons in total ⇒ atom number 14

⇒Silicon (Si)

⇒1s² 2s² 2p4

This means there are 2 electrons on the first shell

There are 6 electrons on the second shell

8 electrons in total ⇒ atom number = 8

⇒Oxygen (O)

⇒ 1s² 2s² 2p6 3s² 3p6 4s1

This means there are 2 electrons on the first shell

There are 8 electrons on the second shell

There are 8 electrons on the third shell

There is 1 electron on the fourth shell

This means there are 19 electrons in total ⇒ atom number 19

⇒Potassium (K)

⇒ 1s² 2s² 2p6 3s² 3p6 3d² 4s²

This means that 2 electrons on the first shell

There are 8 electrons on the second shell

There are 10 electrons on the third shell

there are 2 electrons on the fourth shell

There are 22 electrons in total ⇒ atom number 22

⇒ Titanium (Ti)

4 0

3 years ago

PLEASE HELP ITS DUE SOON PLEASE ILL GIVE BRAINLIESTTT

Helen [10]

Answer:

b. tendons connected muscles to bone.

4 0

3 years ago

The following equations are half reactions and reduction potentials. Ag+ (aq) + e– Ag(s) has a reduction potential of +0.80 V. C

Lady bird [3.3K]

Answer : The correct option is, (A) silver ion gains electrons more easily and is a stronger oxidizing agent than a chromium(III) ion.

Explanation :

The given half reaction are :

1st half reaction : $Ag^+(aq)+e^-\rightarrow Ag(s)$

The reduction potential of this reaction = +0.80 V

2nd half reaction : $Cr^{3}+(aq)+3e^-\rightarrow Cr(s)$

The reduction potential of this reaction = -0.74 V

From the reduction potentials, we conclude that the reaction which have positive reduction potential, they will gain electrons more easily and reduced itself and act as a stronger oxidizing agent.

Or we can say that the reaction which have negative reduction potential, they will lose electrons more easily and oxidized itself and act as a stronger reducing agent.

The reduction potential of 1st half reaction is positive and 2nd half reaction is negative.

Therefore, the silver ion gains electrons more easily and is a stronger oxidizing agent than a chromium(III) ion.

5 0

4 years ago

Read 2 more answers

Which of the following describes an exothermic reaction?

sattari [20]

Answer:

The answer to your question is: second option.

Explanation:

An exothermic reaction is a reaction that releases energy to the environment.

Thermal energy is absorbed by the system. This sentence is describing an endothermic reaction.

Thermal energy is absorbed by the surroundings. This sentence is describing an exothermic reaction.

Thermal energy is not transferred. This sentence is describing an isolated system.

The initial and final temperatures of the system remains the same. This option is incorrect is not describing an exothermic reaction.

7 0

4 years ago

Determine the volume of distilled water that should be added to 20.0 mL of 12.0 M HCl(aq) in order to prepare a 0.500 M HCl(aq)

BARSIC [14]

Answer:

$V_{H_2O}=460 mL$

Explanation:

Hello!

In this case, in a dilution process, water is added to a solute in order to decrease its concentration but increase the volume of the solution. It means that if we have 20.0 mL of a 12.0-M solution of HCl and we want a 0.500-M solution, we need to apply the following formula considering that the moles remain unchanged:

$M_1V_1=M_2V_2$

Thus, solving for the final volume is:

$V_2=\frac{M_1V_1}{M_2}$

So plugging in the values we obtain:

$V_2=\frac{12.0M*20.0mL}{0.500M}\\\\V_2=480 mL$

Now, since the initial volume of acid was 20.0 mL and the final volume is 480 mL, the added volume of distilled water is:

$V_{H_2O}=480-20=460 mL$

Best regards!

8 0

3 years ago