The animal with feather but cannot fly is a bird.
This is because all birds are characterized by the presence of feathers on their bodies (no mammals have feathers). However, not all birds can fly.
For example: ostriches are birds but cannot fly.
Answer:
Troposphere
Explanation:
The troposphere is the lowest layer of Earth's atmosphere that extends from under the stratosphere down to the surface of the earth. Nearly all weather condition takes place in the troposphere. The troposphere contains about 75% of the atmosphere's mass and 99% of the total mass of water vapour and aerosols in the atmosphere.
Answer:
The right choice is:
B. 21, 21, 53.
Explanation:
Atomic Number = Number of electrons = Number of protons
So, the No. of protons (A) = Number of electrons =21
Atomic Number (B) = Number of electrons =21
Mass number (C) = Number of electrons + Number of neutrons = 21 + 32 = 53
<u> </u><u>So, the right choice is: </u>
B. 21, 21, 53.
Answer:
cells are too small to see with the naked eye and a microscope magnifies them
Explanation:
Answer:
0.023
Explanation:
The Arrhenius' equation states that:
Where k is the velocity constant of the reaction, A is the constant of the collisions, Ea is the activation energy (the energy necessary to the molecules have so the reaction will happen), R is the gas constant (8.314 J/molK) and T is the temperature.
This equation is derivated of:
k = pZf
Where
p=fraction of collisions that occur with reactant molecules properly oriented
f=fraction of collisions having energy greater than the activation energy
Z=frequency of collisions
Thus, p*Z = A, and
f =
So, if the energy of the molecules is 12.5 kJ/mol = 12500 J/mol, thus the fraction will be:
f =
f = 0.023