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4 years ago

Where did the lighter elements like hydrogen and helium go to when the solar system formed

1 answer:

4 0

Some of them remained in space, some ended up in the gas giants, Jupiter, Saturn, etc. A good percentage ended up in the sun

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What is pH when 4.0 mL of 2.0 M barium hydroxide is added to 10.0 mL of 1.00 M nitric acid?

Anika [276]

Answer : The pH of the solution will be 13.63.

Solution:

Moles of hydroxide ions in barium hydroxide solution

$BaOH_2\rightarrow Ba^++2(OH)^-$

Number of moles = (concentration) $\times$ (volume in liters) ...(1)(1L=1000mL)

2.0 M barium hydroxide in solution

Number of moles of $Ba(OH)_2$ in 2.0 M solution $=2.0 M\times 0.004 L=0.008$ moles

If One mole of barium hydroxide gives two moles of hydroxide in solution then 0.008 moles will give:

Number of moles of $OH^-=(2)\times (0.008 mol)=0.016$ moles

Moles of $H^+$ ions in nitric acid

$HNO_3\rightarrow NO^{-}_{3}+H^+$

In 1.00 M nitric acid solution

Moles of nitric acid in 1.0 M solution $=(1.0 M)\times(0.010 L)=0.010$ moles

If one mole of nitric acid will give one moles of $H^+$ ion.

Then 0.010 moles of nitric acid in solution will give :

Number of moles of $H^+=(1)\times (0.010 mol)=0.010$ moles

Since , the reaction will be neutralization reaction, equal number of moles of $H^+$ will neutralize equal number of moles of $OH^-$

So,0.010 moles of $H^+$ will neutralize 0.010 moles of $OH^-$ in the solution

Remaining moles of $OH^-=0.016- 0.01=0.006$ moles

Concentration of $[OH^-]$ resulting solution

Resulting volume of the solution : 0.004 + 0.010 liters

Calculating $[OH^-]$ by using equation (1).

$[OH^-]=\frac{0.006}{0.004L+0.010 L}=0.4285 M$

$pOH=-log[OH^-]=-log(0.4285)=0.367$

$pH=14-pOH=14-0.367=13.633$

The pH of the solution will be 13.633.

8 0

4 years ago

Theories are used to make predictions true or false

Viktor [21]

Answer:

True

Explanation:

Theories are ideas which are used to make predictions

8 0

3 years ago

Read 2 more answers

Ag(s)+CN−(aq)+O2(g)→Ag(CN)−2(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Express

Lerok [7]

Answer : The balanced redox reaction will be,

$4Ag(s)+8CN^-(aq)+O_2(g)+4H^+(aq)\rightarrow 4Ag(CN)_2^-(aq)+2H_2O(l)$

Explanation :

The given chemical equation is,

$Ag(s)+CN^-(aq)+O_2(g)\rightarrow Ag(CN)_2^-(aq)$

In the half reaction method, the number of atoms in each half reaction and number of electrons must be balanced.

The half reactions in the acidic medium are :

Reduction : $O_2(g)+4H^+(aq)+4e^-\rightarrow 2H_2O(l)$ ......(1)

Oxidation : $Ag(s)+2CN^-(aq)\rightarrow Ag(CN)_2^-(aq)+1e^-$ .......(2)

Now multiply the equation (2) by 4 and then added both equation, we get the balanced redox reaction.

Thus, the balanced redox reaction will be,

$4Ag(s)+8CN^-(aq)+O_2(g)+4H^+(aq)\rightarrow 4Ag(CN)_2^-(aq)+2H_2O(l)$

7 0

4 years ago

PLEASE HELP ILL GIVE U BRAINLIEST What's something you learned about the periodic table

valina [46]

Answer:

The periodic table of elements puts all the known elements into groups with similar properties. This makes it an important tool for chemists, nanotechnologists, and other scientists. If you get to understand the periodic table and learn to use it, you'll be able to predict how chemicals will behave.

7 0

3 years ago

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Why are fungi classified together?

mash [69]

Answer:

A, they get their food in the same way.

Explanation:

Some fungi can be toxic or poisonous.

Example: mushrooms. Mushrooms typically are found in forests and meadows/plains.

Some fungi are glowing, brown, and in many forms/shapes.

In conclusion, fungi all get nutrient from the dirt they grew in, forests can be moist which gives fungi excellent places to form, usually around trees, because they can absorb plenty of nutrients from the dirt.

4 0

3 years ago