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Dennis_Churaev [7]
2 years ago
10

What element contains 7 protons and 5 valence electrons?.

Chemistry
1 answer:
kow [346]2 years ago
6 0

Answer:

D) The element is nitrogen (N), and it is not very reactive

Explanation:

Given that the atomic number or proton number of Nitrogen, hence it can be concluded that the statement correctly identifies NITROGEN.

Also, considering that the quantity of electrons in the outermost shell of an atom specifies its reactivity, and the higher the number of electrons or electron shells, the lower the level of reactions because they are less likely to gain an electron.

Hence, it can also be concluded that, with 5 valence electrons, nitrogen is not very active

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The density of copper is 8.92 g/cm^3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what wo
dybincka [34]

The slope would be 8.92g/cm^3.

<em>D = m/V</em>

<em>m = DV </em>

The equation for a straight line is

<em>y</em> = m<em>x</em> +b, where m is the slope and b is the y-intercept. We have

<em>m</em> = D<em>V</em> + 0

Thus, a plot of <em>m</em> vs <em>V</em> will give a straight line with a slope of <em>D</em> and a

<em>y</em>-intercept at the origin.

Slope = <em>D</em> = 8.92g/cm^3

3 0
3 years ago
You want 200 mL of a 0.1 g/mL solution of sugar. how do you prepare the solution?
Inga [223]
0.1/200= 0.0005 , u need to dissolve .0005 grams of sugar
4 0
3 years ago
What is the kentic energy of a 2 kg ball as it falls half way from a 40 meter tall building
Len [333]

Answer:

392

Explanation:

According to the law of conservation of energy, energy cannot vanish,so the lost potential energy must be converted into another form of energy (in this case, Kinetic Energy).

(mass*g*height)-(mass*g*halfway height)=(2*9.8*40)-(2*9.8*20)

784-392=392

This makes sense because since the rock has fallen halfway, half of its potential energy has become kinetic energy. Once the rock reaches a height of 0 Meter, all of its potential energy will be kinetic energy.

8 0
3 years ago
What will most likely happen when two bromine atoms bond together?
Sholpan [36]
<span>Ionic bonding is the entire exchange of valence electron(s) between particles. It is a kind of substance security that creates two oppositely charged particles. In ionic bonds, the metal loses electrons to wind up plainly an emphatically charged cation, though the nonmetal acknowledges those electrons to end up noticeably a contrarily charged anion.</span>
5 0
3 years ago
Read 2 more answers
An industrial synthesis of urea obtains 87.5 kg of urea upon reaction of 68.2 kg of ammonia with excess carbon dioxide. Determin
dolphi86 [110]

Answer:

The theoretical yield of urea = <u>120.35kg</u>

The percent yield for the reaction = <u>72.70%</u>

Explanation:

Lets calculate -

The given reaction is -

2NH_3(aq)+CO_2 →CH_4N_2O(aq)+H_2O (l)

Molar mass of urea CH_4N_2O= 60g/mole

Moles of NH_3 = \frac{62.8kg/mole}{17g/mole} (since Moles=\frac{mass  of  substance}{mass of one mole})

                     = 4011.76 moles

Moles of CO_2 = \frac{105kg}{44g/mole}

                = \frac{105000g}{44g/mole}

                = 2386.36 moles

Theoritically , moles of NH_3 required = double the moles of CO_2

    but , 4011.76 , the limiting reagent is NH_3

Theoritical moles of urea obtained = \frac{1 mole CH_4N_2O}{2mole NH_3}\times4011.76 mole NH_3

                                                      = 2005.88mole CH_4N_2O

Mass of 2005.88 mole of CH_4N_2O =2005.88 mole \times\frac{60g CH_4N_2O}{1mole CH_4N_2O}

                                                     = 120352.8g

                                                     120352.8g\times \frac{1kg}{1000g}

                                                     = 120.35kg

Therefore , theroritical yeild of urea = 120.35kg

Now , Percent yeild = \frac{87.5kg}{120.35kg}\times100

                                 72.70%

Thus , the percent yeild for the reaction is 72.70%

8 0
3 years ago
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