Answer:
No
Explanation:
This is because light cannot not whiten Jayden's teeth but light can change materials by hearing it up. There are some substances or tooth paste that can be use to whiten the teeth because of the content they are made off which whitens the teeth. Some of it include baking soda, hydrogen peroxide toothpaste, tumeric toothpaste, toothpaste that contain fluoride.
Answer:
Calcium (Ca²⁺)
Explanation:
Calcium is very important mineral, found in teeth and bones primarily.
It is needed for the strong bones.
It is very important to maintain the bones in order to support our skeleton.
In our body it is also important to carry out other functions like in muscles, nerve function and also for heart.
If our diet is not full of calcium, the calcium deficiency may occur which leads to the weakening of bones and cause fracture.
The dietary source of calcium includes:
Yogurt, cheese, milk
beans such as peas, peanuts.
fishes
almonds, oranges, molasses
I would say A. Because it looks as though it’s the best answer
Answer:
See Explanation
Explanation:
8Fe + S₈ => 8FeS
Given: 10g 10g
moles 10g/56g/mol 10g/256g/mol
= 0.179mol Fe = 0.039mol S₈
Reduce => divide mole values by respective coefficients; smaller value is Limiting Reactant.
0.179/8 = 0.022 0.039/1 = 0.039
=> Fe is limiting reactant
8Fe + S₈ => 8FeS
Given: 10g/56g/mol 10g/256g/mol
= 0.179mol = 0.039 mol 0.179mol FeS produced
1/8(0.179)mol S₈ used (coefficients are equal,
= 0.022 mol S₈ used => moles Fe = moles FeS)
= (0.039 - 0.022)mol S₈ = 0.179mol FeS
remains in excess =(0.179mol)(88g/mol)
= 0.0166 mol S₈ (excess) = 15.8 g FeS
= (0.0166mol)(256g/mol) (Theoretical Yield)
= 4.26g S₈ in excess
Aluminium-27 is an isotope of aluminium characterized by the fact that is has a mass number equal to 27.
Now, an atom's mass number tells you the total number of protons and of neutrons that atom has in its nucleus. Since you're dealing with an isotope of aluminium, it follows that this atom must have the exact same number of protons in its nucleus.
The number of protons an atom has in its nucleus is given by the atomic number. A quick looks in the periodic table will show that aluminium has an atomic number equal to 13.
This means that any atom that is an isotope of aluminium will have 13 protons in its nucleus.
Since you're dealing with a neutral atom, the number of electrons that surround the nucleus must be equal to the number of protons found in the nucleus.
Therefore, the aluminium-27 isotope will have 13electrons surrounding its nucleus.
Finally, use the known mass number to determine how many neutrons you have
mass number=no. of protons+no. of neutrons
no. of neutrons=27−13=14
hope this helps.
