Answer is: chemical.
Making a pancake from batter is chemical change (chemical reaction), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.
Batter is thin dough that is poured into a pan to make pancakes.
In physical change, the same substance is present before and after the psysical change, just with different form or state of matter.
Answer:
• potential for a species to increase in number
• the heritable genetic variation/ which results from mutation in dna
• the size of a population increases
• competiton for resources that are limited in that specific environment.
Explanation:
these are all factors that would affect natural selection although there are many more.
Answer:
Contents Home Courses University of California Davis UCD Chem 2C: General Chemistry III UCD Chem 2C: Larsen Text Unit 4: Chemical Kinetics Expand/collapse global location
4.7: Collision Theory
Last updatedSep 3, 2020
4.6: Using Graphs to Determine (Integrated) Rate Laws
4.8: Temperature and Rate
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Learning Objectives
Molecules must collide in order to react.
In order to effectively initiate a reaction, collisions must be sufficiently energetic (kinetic energy) to break chemical bonds; this energy is known as the activation energy.
As the temperature rises, molecules move faster and collide more vigorously, greatly increasing the likelihood of bond breakage upon collision.
Collision theory explains why different reactions occur at different rates, and suggests ways to change the rate of a reaction. Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting. For collisions to be successful, reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation.
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Answer : The rms speed of the molecules in a sample of
gas at 300 K will be four times larger than the rms speed of
molecules at the same temperature, and the ratio
constant with increasing temperature.
Explanation :
Formula used for root mean square speed :

where,
= rms speed of the molecule
R = gas constant
T = temperature
M = molar mass of the gas
At constant temperature, the formula becomes,

And the formula for two gases will be,

Molar mass of
= 32 g/mole
Molar mass of
= 2 g/mole
Now put all the given values in the above formula, we get

Therefore, the rms speed of the molecules in a sample of
gas at 300 K will be four times larger than the rms speed of
molecules at the same temperature.
And the ratio
constant with increasing temperature because rms speed depends only on the molar mass of the gases at same temperature.
Answer:
Water vapor to dew
Explanation:
Water vapor turns from a gas into a liquid, such as dew on the morning grass.