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3 years ago

11

HELP SCIENCE QUIZ I WILL MARK YOU BRAINLIEST

2 answers:

Goryan [66]3 years ago

7 0

Answer:

i want to say nuclues but again i also think that it is electron shells

Verizon [17]3 years ago

7 0

Answer:

Nucleus

Explanation:

The nucleus is a small, dense region at the center of the atom. It consists of positive protons and neutral neutrons, so it has an overall positive charge. The nucleus is just a tiny part of the atom, but it contains virtually all of the atom's mass.

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Just take it for free,

Orlov [11]

Answer:

Thanks bro, I will gladly take them for free

5 0

3 years ago

Which atom has 17 protons , 18 neutrons and is 1/2 of many salts?

Ilya [14]

The answer is a chlorine atom.

4 0

3 years ago

How many grams of naoh are needed to prepare 500 ml of 0.125 m naoh?

Romashka-Z-Leto [24]

First let us calculate for the number of moles needed:

moles NaOH = 0.125 M * 0.500 L = 0.0625 mol

The molar mass of NaOH is 40 g/mol, hence the mass is:

mass NaOH = 0.0625 mol * 40 g/mol

<span>mass NaOH = 2.5 grams</span>

6 0

3 years ago

Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. Th

Zarrin [17]

Answer: 136 g of $NaN_3$ must be reacted to inflate an air bag to 70.6 L at STP.

Explanation:

Using ideal gas equation:

$PV=nRT$

P= pressure of nitrogen gas = 1 atm (at STP)

V =volume of nitrogen gas = 70.6 L

n = number of moles of nitrogen gas = 1 atm (at STP)

R = gas constant = 0.0821 Latm/Kmol

T = temperature of nitrogen gas = 273 K (at STP)

$1atm\times 70.6L=n\times 0.0821 L atm/K mol\times 273$

$n=3.14$

For the balanced chemical reaction:

$2NaN_3(s)\rightarrow 2Na(s)+3N_2(g)$

3 moles of nitrogen are produced by = 2 moles of $NaN_3$

3.14 moles of nitrogen are produced by = $\frac{2}{3}\times 3.14=2.09$ moles of $NaN_3$

Mass of $NaN_3$ = Moles × Molar mass = 2.09 mole × 65 g/mol = 136 g

7 0

4 years ago

Choose all the answers that apply.

iogann1982 [59]

Answer:

All the options are correct except "has 7 electrons"

Explanation:

7 0

3 years ago

Read 2 more answers