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Maksim231197 [3]
2 years ago
6

Help me plsss yall??????

Chemistry
2 answers:
BartSMP [9]2 years ago
3 0

Answer:

First one answer is physical and other remaning chemical

Marat540 [252]2 years ago
3 0

Answer:

Hydrogen is a colorless, tasteless, and odorless gas.  

physical

--------------------------------------------------------------------------------------------------------------

Hydrogen is very combustible in the presence of oxygen.  

chemical

--------------------------------------------------------------------------------------------------------------

Hydrogen is very reactive with most elements.  

chemical

--------------------------------------------------------------------------------------------------------------

Hydrogen is the least dense of all elements.  

physical

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Answer:

0.44316859040048207mol

Explanation:

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What is the condensed structural formula of the product of the reaction of 2,7-dimethyl-4-octene with hydrogen and a metal catal
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  The  condensed  structural  formula  of the  product  of the  reaction of 2,7-dimethyl-4-octene  with hydrogen   and metal  catalyst.

 Ch3 CH(CH3) CH2 CH2 CH2 CH2 CH(CH3) CH3

Equation  is  as follows

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→

CH3 CH(CH3)CH2 CH2 CH2 CH2 CH(CH3) CH3

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6 0
3 years ago
What is the percent composition of dinotrogen pentoxide? With work shown please
iris [78.8K]

Answer:

%N = 25.94%

%O = 74.06%

Explanation:

Step 1: Calculate the mass of nitrogen in 1 mole of N₂O₅

We will multiply the molar mass of N by the number of N atoms in the formula of N₂O₅.

m(N): 2 × 14.01 g = 28.02 g

Step 2: Calculate the mass of oxygen in 1 mole of N₂O₅

We will multiply the molar mass of O by the number of O atoms in the formula of N₂O₅.

m(O): 5 × 16.00 g = 80.00 g

Step 3: Calculate the mass of 1 mole of N₂O₅

We will sum the masses of N and O.

m(N₂O₅) = m(N) + m(O) = 28.02 g + 80.00 g = 108.02 g

Step 4: Calculate the percent composition  of N₂O₅

We will use the following expression.

%Element = m(Element)/m(Compound) × 100%

%N = m(N)/m(N₂O₅) × 100% = 28.02 g/108.02 g × 100% = 25.94%

%O = m(O)/m(N₂O₅) × 100% = 80.00 g/108.02 g × 100% = 74.06%

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2 years ago
Shoe companies imbed unique designs on the bottoms of the sneakers they manufacture. What is the main purpose of the designs on
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According to the law of conservation of matter, the number of ________ is not changed by a chemical reaction. A. molecules B. at
laila [671]
The answer is B. atoms 
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Read 2 more answers
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