Answer:
The physical and chemical properties of the product do not match the properties of the reactant.
Explanation:
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H 2 (g) + O 2 (g) -------------------------------------> 2H 2O (l)
The reaction between sugar and oxygen form a product which is different from the reactant that's why it indicate the occurrence of chemical reaction.
While in case of physical changes just state of matter are changed. Properties remain same.
Answer:
6.70 g
Explanation:
A common formula for determining the amount of sample remaining in terms of its half-life is
where
t = 458 000 yr
Calculate n
n = 458 000/229 000
n = 2.000
===============
N = 1.675 g Calculate N₀
1.675 = N₀ × 0.2500 Divide by 0.2500 and transpose
N₀ = 1.675/0.2500
N₀ = 6.70 g
Answer:
The structure elucidated from the spectral data has been attached as a separate file. Spectral information explained below:
Explanation:
Taking into account the Quaternary state of all carbon atoms, the structure of this compound has been identified. Proton NMR has been sectioned into group A-D based on their chemical shift and environment.
<u>IR peak</u> at 825 cm-1 indicates <em>presence of unsaturated hydrocarbon</em>
<u>H NMR </u>
- A- 1.20 ppm (6H d): <em>RCH2R </em>
- B- 2.85 (1H, septet):<em> RC≡C-H </em>
- C- 7.0ppm (4H, s): <em>vinyl hydrogens</em>
- D- 2.28 (3H, s): <em>alkyl hydrogens</em>
Answer:
C. Methane.
Explanation:
Methane is a chemical that can kill you. A, B and D all won't kill you because that is a significant contributor to greenhouse gasses.
hope this helped.
Answer:
Option(II) and option (IV) are correct.
Explanation:
Here products are and and reactant is
(I) According to Le-chatelier principle,increase in will shift the equilibrium towards reactant side to keep the equilibrium constant unchanged.
(II) According to Le-chatelier principle,decrease in will shift the equilibrium towards product side to keep the equilibrium constant unchanged.
(III) Adding a catalyst will not change position of equilibrium. Catalyst only helps to achieve equilibrium in a lesser time.
(IV) As this reaction is an endothermic reaction therefore heat is consumed in formation of product. Therefore increase in temperature will lead to formation of more product to consume excess heat added.
(V) Pure solids and liquids do not affect position of equilibrium as their concentrations remain unchanged.