Group 1A (the alkali metals) almost always form cations (positive ions). They'd need anions (negative ions) to ionic bond with. Beryllium (Be) is group 1A already and forms Be+ cation. Bromine is a halogen, and forms Br-, an anion. Platinum is a metal, and usually won't ionic bond with anything. Francium is rare and highly radioactive, plus it so happens to be group 1A as well. Only bromine can form the anion that the group 1A cations need.
Answer: C I think tell me if its wrong
Explanation:
Answer:
232.9K
Explanation:
V₁ = 5dm³
P₁ = 0.92atm
T₂ = 30°C
V₂ = 5.7L
P₂ = 800mmHg
Unknown:
T₁ = ?
Solution:
To solve this problem, we are going to apply the combined gas law which is fusion of the avogadro's law, boyle's law and charles's law.
Mathematically;
p, v and T are pressure, volume and temperature respetively
1 and 2 depicts the initial and final states.
We need to convert ;
temperature to K and pressure into atm
T₂ = 30°C = 273 + 30 = 303K
P₂ = 800mmHg;
760mmHg = 1 atm
800mmHg = 
= 1.05atm
Input the variables and solve;
T = 232.9K
The relation between molecular (formula) mass and molar mass Page 4 4 • To obtain one mole of copper atoms (6.02 x 1023 atoms), weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.
The reactants has 2 NO2 and the product has 3. So we need to make sure we have 6 on each side.
Al + 3Fe(NO2)2 -> Fe + 2Al(NO2)3
This leaves us with us just to balance the Fe And Al
2Al + 3Fe(NO2)2 -> 3Fe + 2Al(NO2)3
Hope this helped :)
