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Arada [10]
2 years ago
15

Where are the least reactive elements on the periodic table?

Chemistry
1 answer:
FinnZ [79.3K]2 years ago
8 0
Helium is the least reactive because it has the least protons
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Rust is formed by the interaction of iron and oxygen. When rust formed on an iron nail with a mass of 100 g, the mass of the rus
DanielleElmas [232]

Answer: The correct option is A.

Explanation: Moles of Iron nail can be calculated by using the formula:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}       ...(1)

Given mass of iron nail = 100 g

Molar mass of iron = 56 g/mol

\text{Number of moles}=\frac{100g}{56g/mol}

Number of moles of iron nail = 1.79 moles

The chemical equation for the formation of rust if given by:

4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)

By Stoichiometry of the reaction,

4 moles of iron reacts with 3 moles of oxygen gas to produce 2 moles of rust.

So, 1.79 moles of iron will react with = \frac{3}{4}\times 1.79 = 1.3425 moles of oxygen gas.

For oxygen gas,

Molar mass = 32 g/mol

Mass of oxygen can be calculated by using equation 1, we get

1.3425mol=\frac{\text{Given mass}}{32g/mol}

Mass of oxygen gas = 43 grams

Hence, the correct option is a.

6 0
3 years ago
According to the VSEPR theory, a molecule or ion of NH₃ will have a _____ shape.
Elan Coil [88]

Answer:

B) flat trigonal

Explanation:

All the Hydrogen atoms are arranged symmetrically around the Nitrogen atom which forms the base, and the two nonbonding electrons form the tip

4 0
2 years ago
Read 2 more answers
A student observed a blue
morpeh [17]

Answer:

Color.

Explanation:

Hello,

In this case, since matter has a lot of properties regarding its physical condition and chemical composition, those related to the appearance of matter are physical. In such a way, since the student observed to different substances with also different colors, we can infer that the property of matter that was observed in the scenario was color, which accounts for the graphical perception we have from them.

Best regards.

5 0
3 years ago
Please help me I need help with this questions I’m very confused fused as to what the answer is please
zepelin [54]
Answer: This was because the experiment showed that a substance could emit radiation even while it was not exposed to light.
3 0
3 years ago
The fastest train in the world can travel 1,500 kilometers in 3 hours. What is its speed?
yanalaym [24]
500
hope this helps!
4 0
2 years ago
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