Answer:
Element A = Oxygen
Element H =
Element B = Aluminum
Element J = Magnesium
Element C = Selenium
Element L = Carbon
Element D = Sodium
Element Q = Francium
Element F = Antimony
Element R = Calcium
Element G = Chlorine
Element S = Tellurium
Explanation:
Element A is Oxygen because: oxygen 6 valence electrons
; is a gas at room temperature
; and is transported in blood to cells.
Element H is Neon because: Neon is a noble gas
; qppears as red light when charged with electricity (Neon light signs) and it has the second highest Ionization energy of the elements
Element B is Aluminum because: Aluminum is a metal and its ion has charge of +3. It is also located on the borders of the Metalloid staircase
.
Element J is Magnesium because its ion has charge of 2+ and is isoelectronic with Neon because it loses two electrons to now have 10 electrons.
Element C is Selenium because its ion that has a charge of -2 is formed by gaining two electrons in order to have 36 electrons which is isoelectronic with Kr
ypton
Element L is Carbon because carbon has the smallest atomic radius of any member in the Carbon family because it is the first member of the family and atomic radius increases on going down the group.
Element D is Sodium because its ion has charge of +1 and it has 2 inner core levels
, the 1 and 2 energy levels.
Element Q is Francium because it has the largest radius and lowest ionization energy of any element
Element F is Antimony. It is a member of Nitrogen family and has the second highest ionization energy level in family
.
Element R is calcium because its on has charge of +2 which is isoelectronic with Argon
. Calcium also has atomic radius is larger than Ar
gon.
Element G is Chlorine. It has the second to the smallest radius of elements in the 3rd period as the second to the last element in the period because atomic radius decreases across a period from left to right.
Element S is Tellurium. It has atomic mass larger than Iodine just to the right of it and is found in the 5th period
Answer- C (water and carbon dioxide)
Incomplete question. Full question reads;
Darwin developed the theory of evolution to explain why there are so many different kinds of living things. He could easily observe that offspring of any animals were slightly different from their parents and that this could allow for big changes over thousands of years. He did not know that genes caused the differences. Genes are now very important in the modern theory of evolution.
What most likely led to a change in the widely accepted theory of evolution?
Answer:
<u>new experiments involving genes and evolution </u>
<u>Explanation:</u>
Indeed, the original theory of evolution has experienced several changes in its acceptance because of its imperfect and wrong assumptions not based on generally acceptable scientific facts,
Hence, new experiments involving genes and evolution has led to a change (disagreements and few agreements) in the widely accepted theory of evolution.
Answer:
Final temperature attained by water = 34.6°C
Explanation:
The reaction of CaO and H₂O is an <em>exothermic reaction</em>. The equation of reaction is given below:
CaO + H₂O ----> Ca(OH)₂
The quantity of heat given off, ΔH°rxn = 64.8KJ/mol = 64800J/mol
Number of moles of CaO = mass/molar mass, where molar mass of Ca0 = 56g/mol, mass of CaO = 10.1g
Number of moles of CaO = 10.1g/56g/mol =0.179moles
Quantity of heat given off by 0.179 moles = 64800 *0.179 = 11599.2J/mol
Using the formula, <em>Quantity of heat, q = mass * specific heat capacity * temperature rise.</em>
mass of mixture = (10.1 + 157)g = 167.1g, Initial temperature = 18.0°C
Final temperature(T₂) - Initial temperature(T₁) = Temperature rise
11599.2J/mol = 167.1g * 4.18J/g·°C * ( T₂ - 18.0°C)
11599.2 = 698.478T₂ - 12572.604
11599.2 + 12572.604 = 698.478T₂
698.478T₂ = 24171.804
T₂ = 34.6°C
Therefore, final temperature attained by water = 34.6°C
You would have to evaporate the water to get just the sugar
