Acetic acid is a colourless liquid. Its is miscribe/soluble in water(or any other physical property). On adding a pinch of sodium hydrogen carbonate, Brisk effervescence is observed. Evolution of a colourless/odourless gas.
Acetic acid is a colourless liquid.
Its is miscribe/soluble in water(or any other physical property).
On adding a pinch of sodium hydrogen carbonate,
Brisk effervescence is observed.
Evolution of a colourless/odourless gas.
Speciation- Formation of new species from pre-existing ones. Factors- 1. Mutations 2. Natural selection 3. Genetic drift 4. Geographical isolation Geographical isolation cannot be a major factor in the speciation of a self-pollinating plant species Reason: Physical barrier cannot be created in self-Read more
Speciation- Formation of new species from pre-existing ones.
Factors-
1. Mutations
2. Natural selection
3. Genetic drift
4. Geographical isolation
Geographical isolation cannot be a major factor in the speciation of a self-pollinating plant species
Reason: Physical barrier cannot be created in self-pollinating plants.
Carbon has 4 electrons in its outermost shell. It cannot lose 4 electrons to form c4+ because very high energy is required to remove 4 electrons. It cannot gain 4 electrons to form c4- ions because it is difficult for 6 protons to hold on to 10 electrons. Ionic/ Electrovalent bonds. Covalent bonds TRead more
Carbon has 4 electrons in its outermost shell. It cannot lose 4 electrons to form c4+ because very high energy is required to remove 4 electrons.
It cannot gain 4 electrons to form c4- ions because it is difficult for 6 protons to hold on to 10 electrons.
Ionic/ Electrovalent bonds.
Covalent bonds
There are no charged particles in carbon compounds and hence poor conductor of electricity.
(a) In a food chain the energy moves progressively through the various tropic levels and is no longer available to the organisms of the previous trophic level/ energy captured by the autotrophs does not revert back to the solar input. (b) Pesticides used for crop protection when washed away/ down inRead more
(a) In a food chain the energy moves progressively through the various tropic levels and is no longer available to the organisms of the previous trophic level/ energy captured by the autotrophs does not revert back to the solar input.
(b) Pesticides used for crop protection when washed away/ down into the soil/ water bodies absorbed by plants/ producers.
(c) On consumption they enter our food chain and being non-biodegradable these chemicals get accumulated progressively and enter our body.
A student is studying the properties of acetic acid. List two physical properties of acetic acid he observes. What happens when he adds a pinch of sodium hydrogen carbonate to this acid? Write any two observations.
Acetic acid is a colourless liquid. Its is miscribe/soluble in water(or any other physical property). On adding a pinch of sodium hydrogen carbonate, Brisk effervescence is observed. Evolution of a colourless/odourless gas.
Acetic acid is a colourless liquid.
See lessIts is miscribe/soluble in water(or any other physical property).
On adding a pinch of sodium hydrogen carbonate,
Brisk effervescence is observed.
Evolution of a colourless/odourless gas.
A student puts a drop of a solution of caustic soda first on a blue litmus paper and then on a red litmus paper. He would observe that
The red litmus paper turns blue and there is no change in the blue litmus paper.
The red litmus paper turns blue and there is no change in the blue litmus paper.
See lessWhat is speciation? List four factors that could lead to speciation. Which of the cannot be a major factor in the speciation of a self- pollinating plant species? Explain briefly.
Speciation- Formation of new species from pre-existing ones. Factors- 1. Mutations 2. Natural selection 3. Genetic drift 4. Geographical isolation Geographical isolation cannot be a major factor in the speciation of a self-pollinating plant species Reason: Physical barrier cannot be created in self-Read more
Speciation- Formation of new species from pre-existing ones.
See lessFactors-
1. Mutations
2. Natural selection
3. Genetic drift
4. Geographical isolation
Geographical isolation cannot be a major factor in the speciation of a self-pollinating plant species
Reason: Physical barrier cannot be created in self-pollinating plants.
Elements forming ionic compounds attain noble gas electronic configuration by either gaining or losing electrons from their valence shells. Explain giving reason why carbon cannot attains such a configuration in this manner to from its compounds. Name the type of bonds formed in ionic compounds and in the compound formed by carbon. also explain with reason why carbon compounds are generally poor conductors of electricity.
Carbon has 4 electrons in its outermost shell. It cannot lose 4 electrons to form c4+ because very high energy is required to remove 4 electrons. It cannot gain 4 electrons to form c4- ions because it is difficult for 6 protons to hold on to 10 electrons. Ionic/ Electrovalent bonds. Covalent bonds TRead more
Carbon has 4 electrons in its outermost shell. It cannot lose 4 electrons to form c4+ because very high energy is required to remove 4 electrons.
See lessIt cannot gain 4 electrons to form c4- ions because it is difficult for 6 protons to hold on to 10 electrons.
Ionic/ Electrovalent bonds.
Covalent bonds
There are no charged particles in carbon compounds and hence poor conductor of electricity.
” Energy Flow in food chains is always unidirectional.” justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
(a) In a food chain the energy moves progressively through the various tropic levels and is no longer available to the organisms of the previous trophic level/ energy captured by the autotrophs does not revert back to the solar input. (b) Pesticides used for crop protection when washed away/ down inRead more
(a) In a food chain the energy moves progressively through the various tropic levels and is no longer available to the organisms of the previous trophic level/ energy captured by the autotrophs does not revert back to the solar input.
See less(b) Pesticides used for crop protection when washed away/ down into the soil/ water bodies absorbed by plants/ producers.
(c) On consumption they enter our food chain and being non-biodegradable these chemicals get accumulated progressively and enter our body.