I would say A. Friction because it is the act of two things rubbing together.
Ex. Trying to make fire
The correct match are as follows:
Boyles Law is about a gas at constant temperature. Therefore, the correct match would be the volume of a gas varies inversely with pressure if the temperature is kept constant.
Charles Law would be that the volume of a gas varies directly with temperature if the pressure is kept constant.
Gay-lussac's law would be that the pressure of a gas varies directly with temperature if the volume is kept constant.
Answer:
In 4 years the carbon monoxide level reach 7.8 parts per million.
Explanation:
The average daily level of carbon monoxide in the air is given by :
parts per million..[1]
The population of the region after t years is modeled by the formula :
...[2]
If level of carbon monoxide level reach 7.8 parts per million in t years.
Using [1] to calculate value of x.
c(x)= 7.8 parts per million
c(x) = 0.5x + 2 parts per million
7.8 parts per million = (0.5x + 2 ) parts per million
Solving for x , we get ;
x = 11.6
Using [2] to calculate value of t.:
x(t) = 11.6

Solving for 't' we get ;
t = 4 years
In 4 years the carbon monoxide level reach 7.8 parts per million.
The Periodic Law
Dmitri Mendeleev developed own periodic law with atomic number as the basis for the arrangement. The Periodic Law, also known as "Mendeleev's Law" states, " When elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically." It also describes the properties of the elements as periodic functions of their atomic weights.
Answer:
The amount of moles of NaOH is 0.0495
Explanation:
Molarity is a measure of concentration that is defined as the number of moles of solute that are dissolved in a given volume.
In symbolic form molarity is presented as:

Molarity is expressed in units
.
In this case:
- Molarity= 0.33 M
- Number of moles of solute= ?
- Volume= 0.75 L
Replacing in the definition of molarity:

number of moles of solute= 0.33 M* 0.75 L
number of moles of solute= 0.0495 moles
<u><em>The amount of moles of NaOH is 0.0495</em></u>