Answer: a) 
b) 
c) 
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration:
a)
b)
c)
D=m/v ⇒ v=m/d
d=density
m=mass
v=volume
Density (Fe)=7.86 g/cm³=7.86 g/ ml
m=4.18 Kg.(1000 g/1Kg)=4180 g
v=m/d=(4180 g) / (7.86 g/ml)=531.8 ml
v=531.8 ml*(1 dl / 100 ml)=5.32 dl
v=5.32 dl
Answer:
The molecules or ions in a solution can freely intermingle.
Explanation:
The reactant molecules and ions can move freely in solution, so thy are more likely to collide with each other and form products.
A is wrong. Solutions are homogeneous.
B and C are wrong. The statements are correct, but they are not the reason why reactions are carried out in solution.
D is wrong. Chemical reactions do not always produce a colour change.
F is wrong. Some chemicals react with water, so other (often flammable) solvents must be used.
Answer: increasing the number of collisions between reactants
Explanation:
A reaction is possible due to collisions between the reactants to create products. If we increase the concentration of reactants then that means that we are increasing the molecules of the reactants which would give them more chances to collide and make products.
For instance, using a non-chemistry example, if there are few cars in a large city, the accidents there will be less because the cars will have such space that they wouldn't collide with each other. If the number of cars in the city is increased however, there is now less space and more chances for cars to collide.
Answer:
The 7th term is 704
Explanation: The equation for this is 
. All you have to do is substitute 7 for n and you'll get the answer.
