Chemistry High School

SCIENCE- The Periodic Table of elements
help help​

SCIENCE- The Periodic Table Of Elements Help Help

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Answer 1

Answer:

hydrogen is the first in periodic table

Related Questions

Pls help ASAP I’ll mark BRAINLIEST this is science btw.

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Answer:

It should be Magnetic fields can push and pull objects without touching

but I only say with touching. Maybe it's an error on you're teachers/Prof behalf.

2. 14g of Nitrogen gas and 8.0g of hydrogen react to produce ammonia according to the equation: N2 + 3H2 -- 2NH3 Calculate the mass of hydrogen leftover once the reaction has happened.
a) Identify the limiting reagent in this reaction. Give a reason for your answer.
b) Determine the amount, in moles of the limiting reagent.
c) Determine the amount, in moles of the excess reagent.
d) Determine which reactant will produce the least amount of ammonia.
e) Calculate the amount, in moles of H2, reacted, when the limiting reagent has been used up.
f) Give the mass of the amount of H2 that has reacted​

Answers

Based on the equation of the reaction, nitrogen is the limiting reagent while hydrogen is the excess reagent.

What is the mole ratio of hydrogen to nitrogen in the formation of ammonia?

Hydrogen and nitrogen combines to form ammonia ina mole ratio of 3 : 1 as shown by the equation of the reaction below:

N2 + 3H2 -- 2NH3

The number of moles of the reactants in 14g of Nitrogen gas and 8.0g of hydrogen is calculated as follows:

Moles = mass/molar mass

Molar mass of N_{2} = 14.0 g

Molar mass of H_{2} = 2.0 g

Moles of N_{2} = 14/14.0 = 1 mole

Moles of H_{2} = 8/2.0 = 4 moles

Based on the data above:

The limiting reagent is nitrogen gas as it will be used up while hydrogen will be left over.The moles of nitrogen is 1 moleHydrogen is the excess reagent and 1 mole will be left over 3 moles of hydrogen will react with 1 mole of the nitrogen gas mass of 3 moles of hydrogen is 3 × 2.0 g = 6.0g

Therefore, the limiting reagent is nitrogen while hydrogen is the excess reagent.

Learn more about limiting reagent at: https://brainly.com/question/24945784

How long does sucrose take to decompose?

Please need help with that!

Answers

after >50 h of holding at 120 °C in a sealed pan, is not surprising, as this condition is above the melting temperature of fructose (a possible first decomposition product), and there were water and impurities

Answer:

> 50h of holding at 120 °C in a sealed pan

Explanation:

The loss of crystaline structure of sucrose was reported at various temperatures, but decompose.

PLS HELP ASAP ILL MARK BRAINLIEST. And this is science btw.

Answers

Answer:Opposite

Explanation:

4. The students predict that the reaction will release a lot of energy. What question could help
provide support for the prediction?

Answers

Take a reaction among lime water

[tex]\\ \rm\rightarrowtail CaO+H_2O=Ca(OH)_2[/tex]

If it releases heat

The question must include

+Heat sign or ∆ symbol∆H must be +ve

Answer:

hope it's helpful to you

A gas at 42. 0°c occupies a volume of 1. 32 l. if the volume increases to 2. 24 l, what is the new temperature in kelvin?

Answers

the answer is 534.54 kelvin

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