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Svetradugi [14.3K]
3 years ago
5

Can someone please help answer these two following things for me. I will give brainiest for an accurate answer. I’ve been postin

g this question several of times and no one has yet answered but please do, this is URGENT

Chemistry
1 answer:
Reptile [31]3 years ago
6 0

Answer:

the iron alone was dark brown and rectangular, whereas the iron-sulfur combination was a dark gray powder.

Explanation:

i hope it helps :) but I answered your questions 2X hehe

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The total amount of energy before and after a chemical reaction is the same. Therefore, energy is _____.
BabaBlast [244]

Answer:

Option (a) is the correct answer.

Explanation:

The law of conservation of energy states that energy can neither be created nor it can be destroyed. It can only be transformed from one form to another.

Therefore, the total amount of energy before and after a chemical reaction is the same. Thus, energy is conserved.

Therefore, we can conclude that option (a) is the correct answer.

8 0
3 years ago
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Are there a mole of golf in a 200 g gold necklace
meriva

Explanation:

The answer is 0.5 moles of gold

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3 years ago
Two diseases wiped out by vaccines are what and what
Olenka [21]
One of the diseases is smallpox and the second is rinderpest
3 0
2 years ago
Determine the empirical formulas for the following compounds:
Delicious77 [7]

Answer:

<em>a)C4H5N2O</em>

<em>b)C12H22O11</em>

<em>c)HO2</em>

<em>d)CH2O</em>

<em>e)C3H4O3</em>

Explan ation:

To obtain th e empirical formul a from the molecular for mula you have to divide the subscripts by the largest whole number you can, that provide you a whole number for each one subscripts:

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8 0
4 years ago
10. Hydrogen peroxide (H2O2: M = 34 g mol-1) is a powerful oxidising agent that is used in concentrated solution in rocket fuel
Lubov Fominskaja [6]

Answer:

The molality of solution=12.605 m

Explanation:

We are given that

Molar mass of Hydrogen peroxide, M=34 g/mol

Density of solution, \rho=1.11gcm^{-3}

30% Means mass of solute (Hydrogen peroxide)=30 g

Mass of solvent =100-30=70 g

Total mass of solution, m=100 g

Number of moles of solute=\frac{given\;mass}{molar\;mass}

Using the formula

Number of moles of hydrogen peroxide=\frac{30}{34}

Now, molality of solution

m=\frac{number\;of\;moles\;of\;solute}{mass\;of\;solvent}\times 1000

m=\frac{30}{70\times 34}\times 1000

m=12.605 m

Hence, the molality of solution=12.605 m

6 0
4 years ago
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