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e-lub [12.9K]
3 years ago
7

I need help fast please !

Chemistry
2 answers:
Alona [7]3 years ago
7 0

Answer:

substance A is water and substance B is chlorophyll

Explanation:

BabaBlast [244]3 years ago
6 0
Substance A is water and Substance B is chlorophyll
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.War nickels, produced from 1942-1945 are composed of 56% copper, 35% silver and 9% manganese. How many moles of each element ar
AnnZ [28]
The moles  of each element  found in a 5.00 g nickel coin is calculated as below

moles =mass/molar mass

calculate the mass of each element  =% composition of element/100 x total mass of  nickel

Mn = 9/100 x5 = 0.45g
Cu=56/100 x5= 2.8 g
Ag= 35/100x5=  1.75 g
moles of each element is therefore=
Mn = 0.45g/54.94 =  8.19 x10^-3 moles

Ag=1.75g/107.87 g/mol = 0.0162 moles

Cu = 2.8 g/63.5 g/mol=0.0441  moles





3 0
3 years ago
After 7.9 grams of sodium are dropped into a bathtub full of water how many grams of hydrogen gas are released
Nataliya [291]

Answer:

<em>The grams of hydrogen gas that are released is 0.343 gram</em>

Explanation:

<em>Given that:</em>

<em>2 Na + 2h₂0 ⇒ 2Na0H +N₂</em>

<em>Molecules of Na = 7.9/2.3 = 0.343 mol Na</em>

<em>Now,</em>

<em>2 molecules  of Na produces one mole h₂</em>

<em>0.343 mol of Na produce  0.343/2 = 0.1717 mol h₂</em>

<em>h2 = molecules * mw (molecular weight)  =0.1717 * 2 =0.343 grams</em>

<em>Therefore the grams of hydrogen gas released is = 0.343 grams</em>

6 0
4 years ago
Why are water molecules polar? select one:
krek1111 [17]
B since Oxygen is more electronegative, meaning they have a strong stronger pull on the electrons creating poles
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4 years ago
I dont get dependent and independent variables if someone can explain it and give an example that wpould be great!​
Musya8 [376]
An independent variable is the variable that is changed or controlled in a experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured. so like is math. the input variable is the independent variable. the output is the dependent variable because it depends on the input variables.
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Which subatomic particle determines the identity of an atom
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The Protons determine the identity.

6 0
4 years ago
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