Answer:
- The standard form of a chemical element is the natural mixture of several isotopes of the same element, which is atoms with the same number of protons but different number of neutrons, while an isotope is a particular kind of atom with a definite number of neutrons.
Explanation:
A <em>chemical element</em> is a pure substance formed by atoms with the same atomic number (number of protons). This is because it is the number of protons what identifies an element.
For example: oxygen is a chemical element, so oxygen is formed by only atoms of oxygen, and the atomic number of those atoms is 8, because every oxygen atom has 8 protons.
Nevertheless, some atoms of oxygen, may have different number of neutrons. Isotopes are different kind of atoms of the same element, which only differ in the number of neutrons. So, some atoms of oxygen will have 8 neutrons, other 9 neutrons, and other 10 neutrons (those are the stable isotopes of oxygen).
That difference in neutrons, is generally accepted that, does not modifiy substantially the chemical properties of the element, but the mass number. So, the isotopes with more neutrons wil be heavier, and the isotopes with less neutrons will be lighter.
- Mass number = number of protons + number of neutrons.
In general a chemical element is formed by a mixutre of isotopes of the same element.
Answer:
C!
Explanation:
only C
A: solid B: liquid : C: GAS
Since the volume is constant,
p1/t = p2/ t
210/120 = p2/150
p2= 262.5kpa
Answer:
0.861842
Explanation:
One atm. equals 760.0 mm Hg, so there will be a multiplication or division based on the direction of the change. Example #1: Convert 0.875 atm to mmHg. Solution: multiply the atm value by 760.0 mmHg / atm.
Answer:
If the volume of the container is decreased to 90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K
Explanation:
Boyle's law says that "The volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure", which is expressed mathematically as:
P * V = k
Charles's Law consists of the relationship between the volume and temperature of a certain amount of ideal gas, which is maintained at a constant pressure, by means of a proportionality constant that is applied directly. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

Finally, Gay Lussac's law establishes that as the temperature increases, the gas molecules move more quickly and therefore the number of collisions against the walls increases, that is, the pressure increases since the container is of fixed walls and its volume can not change. Therefore, the ratio of pressure to temperature always has the same value (it is constant).

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

Having a state 1 at the beginning and a state 2 at the end is fulfilled:

In this case, you know:
- P1= 0.800 atm
- V1= 180 mL= 0.180 L (being 1 L=1000 mL)
- T1= 29 °C= 302 °K
- P2= 1.60 atm
- V2= 90 mL= 0.09 L
- T2=?
Replacing:

Solving:


T2= 302 °K
<em><u>If the volume of the container is decreased to 90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K</u></em>