Answer:
Explanation:
Remember that the atomic number of an element is the number of protons and the mass number is the number of protons plus neutrons.
1) <em>Deuterium</em> representation:
- Hydrogen: ⇒ H
- One proton: ⇒
- One neutron: ⇒ add 1 to the mass number = 1 + 1 = 2 ⇒
2) <em>Helium-3</em> representation:
- He atom with 1 neutron: ⇒ mass number = 2 + 1 ⇒
3) <em>Neutron </em>representation
- Atomic number 0 and mass number 1: ⇒
4) Nuclear equation:
← answer
The volume of a balloon f a gas at 842 mm Hg and -23 celsius if it’s volume is 915 milliliters at a pressure of 1170 mm Hg And a temperature of 24 celsius is 0.22 litres
Explanation:
Data given:
Initial volume of the balloon having gas V1= 915ml OR 0.195 L
initial pressure of the gas P1= 1170 mm Hg OR 1.53 atm
initial temperature of the gas T1 = 24 celsius or 273.15 + 24 = 297.15 K
Final pressure of the gas P2 = 842 mm Hg or 1.10 atm
final temperature of the gas T2 = -23 degrees or 273.15 - 23 = 250.15 K
Final volume at final temperature and pressure V2=?
The formula used is of Gas Law:
= 
V2 = 
putting the values in the equation:
V2 = 
V2 = 0.22 litres is the volume
The volume is 0.22 litres at a pressure of 1170 mmHg and temperature of -23 degrees.
Here is the correct answer of the given question above about the crucible. The crucible and its contents gain mass when heated because <span>it contains a compound that forms a stable and solid oxide. Hope this is the answer that you are looking for. Have a nice day!</span>
The element would be Oxygen.
Work:
Mass = atomic # + neutrons
(The atomic number is the same as the number of protons in an element)
To find the number of protons substitute x
16 = x + 8
x = 8 protons
Oxygen has 8 protons
I hope this helps!
2) D = m/V. Knowns: V = (4 x 4 x 4) = (64) D = 2.7
2.7 = m/(64)
172.8 = m or with significant figures, 170
3) Knowing the model of the atom is crucial becuase without understanding what everything is made up of, then there is no way of telling how it is going to react with outside things. Knowing the model of the atom can better help us visualize what it looks like and it can also tell us how it is going to react baced on its propertys and what it is made of.
4) Dalton's theory tells us that 1, all matter is made of atoms, which are indivisible and indestructiable. This does not agree with todays findings because we know that atoms can be broken up into sub atomic particals, and even those sub atomic particals can be broken down even further to sub-sub-atomic particals such as quarks and borons. 2, We also know about Isotopes. Isotopes are the same atom but with different atomic weights becaus of the amount of nutrons in the nuclei.
5) If an element has 12 protons and 17 neutron, in order to be stable and found in nature, the atom must have 12 protons because protons are positive and neutrons have a charge of 0 so in order to balence the atom out, the electrons, with a negitive charge, must be the same number as the protons.
