Answer:
by changing the number of protons in the atom
Explanation:
Elements are defined by their number of protons. For example, an element with 1 proton is hydrogen, and an element with 2 protons is helium. Changing the number of neutrons or electrons in a preexisting element will not make a new element. Is is possible to create new elements, but it requires large amounts of heat and/or pressure.
Answer:
the answer is D. stress
If a stress is applied, the equilibrium shifts to relieve this change in conditions.
Answer:
63.5 g
Explanation:
Given data:
Number of moles of iodine needed = 0.250 mol
Mass to be measured = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of diatomic iodine = 253.8 g/mol
by putting values,
0.250 mol = mass / 253.8 g/mol
Mass = 0.250 mol × 253.8 g/mol
Mass = 63.5 g
Thus, student need to be measured 63.5 g of iodine.
Hydrogen only has 1 electron so not A.
Barium has 2 valence electrons so answers B!
<span>Avogadro's number
represents the number of units in one mole of any substance. This has the value
of 6.022 x 10^23 units / mole. This number can be used to convert the number of
atoms or molecules into number of moles. We do as follows:
</span>10 mol NH3 ( 6.022 x 10^23 molecules / 1 mol ) = 6.022x10^24 molecules NH3
