Which formula represents an unsaturatedorganic compound?
(1) CH4 (3) C3H8
(2) C2H4 (4) C4H10
Answers
Answer: (2)
Explanation: Unsaturated organic compounds are those compounds which contains carbon-carbon double or triple bond.
Saturated organic compounds are those compounds which contains carbon-carbon single bond.
,
and
are all alkanes having general formula
containing single bonds.
is an alkene having general formula
containing double bonds.
From that we can see that:
CH4, C3H8 and C4H10 are saturated.
Therefore:
C2H4 is unsaturated. Answer is (2).
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Answers
A.
Only the Fe is unbalanced.
B.
Only the O is unbalanced
C.
Fe and O are both unbalanced.
D.
C and O are both unbalanced
Answers
These are two questions and two answers.
Question 1: Law of Conservation of Mass
Answer: option B. The total mass remains the same during a chemical reaction.
Explanation:
The law of conservation of mass is a universal law. It states that mass is mass is neither created or destroyed, but is is conserved.
In chemical reactions, that means that, always, the total mass of the reactants equals the total mass of the products or, as the option B. states, during a chemical reaction the total mass remains the same.
Since, in chemical reactions, the atoms are not modified (the atoms just bond in different form or with different atoms), that implies that total number of each kind of atoms in the reactants equals the total number of the same kind of atoms in the products.
That is the basis for balancing the chemical equations and for the stoicheometric calculations.
Question 2 . Which element(s) are not balanced in this equation?
Answer: option A. Only the Fe is unbalanced.
Explanation:
1) Given equation: Fe₂O₃ + 3 CO → Fe + 3 CO₂
2) Count the number of atoms of each kind on each side of the equation
i) Fe
reactant side: 2
product side: 1
Therefore, Fe is not balanced
ii) O
reactant side: 3 + 3 = 6
Product side: 3 × 2 = 6
Therefore, it is balanced
iii) C
reactant side: 3
product side: 3
Therefore, C is balanced.
3) Conclusion: Only the Fe is unbalanced.
For #1, the answer is B. The total mass remains the same during a chemical reaction.
For #2, given Fe2O3 + 3CO -> Fe + 3CO2
Fe is unbalanced, and O is also unbalanced
Therefore, Option C: Fe and O are both unbalanced, is true.
IT
Answers
Answer:
Fossils: 3.5 billion. Rocks: 4.28 billion
they were found during Haden Eon
Explanation:
Answers
Answer:
Geiger-Mueller tube or Geiger counter and a Personal Radiation Detector (PRD).
Explanation:
In order to immediately detect traces and signs of radiation leaks in the nuclear power plant, the supervisor must use two devices that readily give its results. These devices could be a Geiger-Mueller tube or Geiger counter and a Personal Radiation Detector (PRD). A PRD has a very fast response time, while a Geiger counter also displays results real time.
gasoline
carbon
glucose
Answers
Answer: The correct answer is carbon.
Explanation:
Combustion reaction is defined as the reaction in which a hydrocarbon burns in oxygen or reacts with oxygen gas to produce carbon dioxide and water molecule.
Fossil fuels are defined as the hydrocarbons which mainly contains coal, fuel oil, natural gas etc..
When fossil fuels are burned in air, it mainly releases carbon dioxide, sulfur dioxide, methane, nitrous oxide etc..
The major component released during the combustion of fossil fuels is carbon.
Hence, the correct answer is carbon.
Answers
Answer : The number of moles of hydrogen gas needed are, 0.253 mole
Explanation : Given,
Moles of water = 0.253 mole
Now we have to calculate the moles of hydrogen gas.
The given balanced chemical reaction is,
From the balanced reaction we conclude that,
As, 2 moles of water obtained from 2 moles of hydrogen gas
So, 0.253 moles of water obtained from of hydrogen gas
Therefore, the number of moles of hydrogen gas needed are, 0.253 mole