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Pepsi [2]
2 years ago
14

Rounded to the nearest whole number, how many electrons are in an atom of zirconium?

Chemistry
1 answer:
Dafna1 [17]2 years ago
6 0

Answer:

40 electrons

Explanation:

The element of zirconium (Zr) has an atomic number of 40, which means it has 40 protons and 40 electrons. It also has a molar mass of 91.224 g/mol.

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The "air bags" that are currently installed in automobiles to prevent injuries in the event of a crash are equipped with sodium
stellarik [79]

Answer:

0.0177 L of nitrogen will be produced

Explanation:

The decomposition reaction of sodium azide will be:

2NaN_{3}(s)--->2Na(s)+3N_{2}(g)

As per the balanced equation two moles of sodium azide will give three moles of nitrogen gas

The molecular weight of sodium azide = 65 g/mol

The mass of sodium azide used = 100 g

The moles of sodium azide used = \frac{mass}{molarmass}=\frac{100}{65}=1.54mol

so 1.54 moles of sodium azide will give = \frac{3X1.54}{2}=2.31mol

the volume will be calculated using ideal gas equation

PV=nRT

Where

P = Pressure = 1.00 atm

V = ?

n = moles = 2.31 mol

R = 0.0821 L atm / mol K

T = 25 °C = 298.15 K

Volume = \frac{P}{nRT}=\frac{1}{2.31X0.0821X298.15}=0.0177L

3 0
3 years ago
The alkline earth metals include?
patriot [66]

Answer:

The Popular ones are five in number

Explanation:

Calcium

Silicon

Germanium

Tin

Lead

5 0
3 years ago
What occurs at one of the electrodes in both an electrolytic cell and a voltaic cell?
rjkz [21]
Anode- oxidization

Cathode-reduction
3 0
3 years ago
Are alchemy and chemistry the same
Anit [1.1K]

Are alchemy and chemistry the same: No

<u>Explanation:</u>

Alchemy and chemistry differ from each other. Their main difference lies in the concepts that they are based on. Alchemy has the base of viewing the reality of nature supernaturally. Chemistry has a base of viewing the reality in a natural way.

Protoscience is the name given for Alchemy. This is because that alchemy usually focuses on the traditional things like procedures and  terminologies. Chemistry always focuses on the matter and their transformations. The matter and its transformations are dealt with chemistry.

5 0
3 years ago
Explain why a solar eclipse occurs only during a new Moon
Gennadij [26K]
Because the moon gets between the Sun and the Earth so you can't see the moon
3 0
3 years ago
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