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4 years ago

HELP TIMED !!!!

Chemistry

2 answers:

Troyanec [42]4 years ago

6 0

Hello there what is the question?

kipiarov [429]4 years ago

3 0

Answer:

Helium is one of the lightest gas that is found to be stored in the interior of the earth's crust. This helium gas is formed from the constant radioactive decay process. During the time of radioactive decay, the radioactive elements decays and give rise to the formation of alpha particles, which are positively charged. When a pair of electrons are combined with these alpha particles then it produces helium atom.

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A beaker containing a mixture of N2(g) and H2(g) is cooled by placing it in a tray of cold water. In response to the cooling, th

Nataliya [291]

The frequency of collisions between the N₂ and H₂ molecules will decrease and the rate of reaction will also decrease.

Since the water is cooler than the gas mixture, heat will flow from the gas to the water.

The gas will cool down, so the average kinetic energy of the gas molecules will decrease.

The molecules will be moving more slowly, so there will be fewer collisions and fewer of these collisions will have enough energy to react.

The rate of reaction between H₂ and N₂ molecules at room temperature is exceedingly slow, but cooling the gas mixture will make the reaction even slower.

3 0

4 years ago

Read 2 more answers

The flask contains 10.0mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.320 M NaOH. What is the init

yan [13]

This question is incomplete, the complete question is;

The flask contains 10.0mL of HCl and a few drops of phenolphthalein indicator.

The buret contains 0.320 M NaOH,

It requires 11.2 mL of the NaOH solution to reach the end point of the titration

What is the initial concentration of HCI?

Answer:

initial concentration of HCl is 0.3584 M

Explanation:

Given that;

the reaction between HCl and NaOH is 1:1 molar

HCl(aq) + NaOH(aq) -------> NaCl(aq) + H2O(l)

we know that molarity is the number of moles of solute per liter of solution

so moles of NaOH consumed

= ( 0.320 mol / 1000ml) × 11.2ml

= 0.003584 mol

now

0.003584 moles of NaOH reacts with 0.003584 moles of HCl

moles of HCl present in the 10.0ml solution = 0.003584 mol

therefore the initial concentration of HCl

= ( 0.003584 mol / 10.0ml )× 1000ml

= 0.3584 M

the initial concentration of HCl is 0.3584 M

5 0

3 years ago

Why are some alkali metals stored under oil?

Dahasolnce [82]

due to there reactive rate?

6 0

3 years ago

Read 2 more answers

How many moles of magnesium are needed to react with 3.0 mol of o2?

JulsSmile [24]

The answer is 4.0 moles of magnesium
because...
..

...4.0mol Makmol O2 =3.0mol O2

6 0

3 years ago

Why is ammonia (NH₃) classified as a polar molecule?

aleksandr82 [10.1K]

Answer:

Ammonia contains an asymmetrical distribution of electric charge.

Explanation:

Hello there!

In this case, accordingly to the electronegativity difference we can calculate for the N-H bond, and based off our periodic table, which shows an electronegativity of 3.0 and 2.1 for N and H respectively, we obtain:

$DE=3.0-2.1=0.9$

Which is within the range of polar molecule even the both of them are nonmetals. Thus, choices a and b are firstly discarded; nonetheless, even when they are both nonmetals, two of these elements usually have a nonpolar bond, which means that option C is discarded, and therefore, our answer is ammonia contains an asymmetrical distribution of electric charge.

Regards!

6 0

3 years ago