Answer:
Melting and evaporation both represent changes in matter that involve behavior at the molecular level.
Answer:
The simple answer is bioaccumulation resulting from biomagnification. Carnivores consume organisms at higher trophic levels, and thus "poisons," such as heavy metals accumulate in these organisms at levels greater than those found in plants. Moreover, such chemicals typically accumulate in the fatty tissues of carnivores, such as the nervous, lymphatic, endocrine, and reproductive systems.
Conductivity is the ability of a substance to allow charge or electricity to pass through it. Metals have a lot of free electrons and are considered as good conductors while non-metals do not conduct electricity
1) In the given examples:
Al is a metal, Na is an alkali metal while P is a non-metal
The decreasing order of conductivity would be:
Al > Na > P
2)
Both Al and Ga are metals while B is metalloid.
Among Al and Ga, Al is a solid at room temperature and a better conductor of electricity. hence the decreasing order would be:
Al > Ga > B
Answer:
1) False
2) False
3) True
4) True
5) False
Explanation:
1. Two sigma bonds comprise a double bond: False
Two sigma bonds are not possible between two atoms . There will always be one pi bond or two bonds with one sigma bond
2. A triple bond consists of one pi bond and two sigma bonds.
Two sigma bonds are not possible between two atoms . There will always be one pi bond or two bonds with one sigma bond
3. Bonds formed from atomic s orbitals are always sigma bonds. True
There is always an head to head overlapping possible with s orbital
4. A pi bond restricts rotation about the sigma-bond axis.
True.
5. A pi bond consists of two pairs of electrons.
False
Each bond can have one pair of electrons
<h2>Answer:</h2>
She should notify her teacher.
<h2>Explanation:</h2>
Sodium Hydroxide is very corrosive in nature and it causes Redness, Pain, Serious skin burns and Blisters. Sodium hydroxide does not produce systemic toxicity, but is very CORROSIVE and can cause severe burns in all tissues that it comes in contact with. Therefore she should not touch it and she must notify her teacher as soon as possible.
