Which alkaline earth metal has the highest ionization energy? Refer to the periodic table.
calcium
magnesium
barium
strontium
The highest ionization energy of alkaline earth metal is calcium. Therefore, option (A) is correct.
What is the ionization energy?The ionization energy can be described as the minimum energy that an electron has to absorb to come out of the effect of the nucleus of a gaseous atom or ion.
It tells about the reactivity of chemical compounds and determines the strength of chemical bonds. The units of ionization energy are electronvolts or kJ/mol.
Ionization energy measures the difficulty in removing an electron from an atom or ion and the loss of electron occurs in the ground state of the chemical species.
According to the general configuration of alkaline earth metals, they contain two electrons in their valence shell. The atomic size of alkaline earth metals increases as we move down the group. The electronegativity and effective nuclear charge of alkaline earth metals decrease.
The electron can easily be lost from the atom as we move down the group. Therefore, calcium present at the top of the group has the highest ionization energy.
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What volume (in L) of water vapor will be
produced from the reaction of 24.65 L of oxygen?
2C2H6(g) + 702(g) —4CO2(g) + 6H2O(9)
Answer: 21.13 L of [tex]H_2O[/tex] will be produced from the reaction of 24.65 L of oxygen
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
[tex]2C_2H_6(g)+7O_2(g)\rightarrow 4CO_2(g)+6H_2O(g)[/tex]
According to stoichiometry :
7 moles of [tex]O_2[/tex] give = 6 moles of [tex]H_2O[/tex] vapour
[tex]7\times 22.4L=156.8L[/tex] of [tex]O_2[/tex] produce = [tex]6\times 22.4L=134.4L[/tex] of [tex]H_2O[/tex] vapour
Thus 24.65 L of [tex]O_2[/tex] produce = [tex]\frac{134.4}{156.8}\times 24.65=21.13[/tex] L of [tex]H_2O[/tex] vapour
21.13 L of [tex]H_2O[/tex] will be produced from the reaction of 24.65 L of oxygen
Answer:
21.13
Explanation:
What charge does a covalent bond have?
A student dissolves 13. g of stilbene (C14H12) in 100. mL of a solvent with a density of 0.85 g/mL. The student notices that the volume of the solvent does not change when the stilbene dissolves in it.
Calculate the molarity and molality of the student's solution. Be sure each of your answer entries has the correct number of significant digits.
Answer:
Molarity = 0.72M
Molality = 0.85M
Explanation:
Molarity and molality are two measures of molar concentration, and they can be calculated as follows:
Molarity = number of moles/volume of solvent
Molality = number of moles/mass (kg) of solvent
Mole = mass/molar mass
Molar mass of stilbene (C14H12) = 12(14) + 1(12)
= 168 + 12
= 180g/mol
mole of stilbene = 13/180
mole = 0.072mol
Volume = 100mL = 0.1L
molarity = 0.072/0.1
Molarity = 0.72M
Molality = number of moles ÷ mass (kg) of solvent
To get mass of solvent, we use;
Density = mass/volume
Mass = density × volume
Mass = 0.85g/mL × 100mL
Mass = 85g
Mass in kg = 85/1000 = 0.085kg
Molality = 0.072/0.085
Molality = 0.847M
Molality = 0.85M
9. I have the lowest electronegativity of the nonreactive elements. My family name is ____________. I am classified as a ___________. I have _____________ valence electrons.
Answer:
I have the lowest electronegativity of the nonreactive elements. My family name is alkali metals. I am classified as a reactive metal. I have one valence electrons.
Explanation:
Electronegativity refers to the ability of the atoms of an element to attract electrons to itself. Based on their nature, non-metals are electronegative elements whereas metal are electropositive as they have a tendency to give up their electrons rather than attract electrons to themselves.
In the periodic table of elements, non-metallic character, and hence, electronegativity increases from left to right across a period, and decreases down a group. The most electropositive element is fluorine. On the other hand, electropositivity decreases across a period from left to right but increases on going down a group. Hence, the most electropositive element is Francium. This also means that Francium is the least electronegative element,
francium belong to the group 1A of the periodic table which are the most reactive metals. The family of group 1A elements are known as alkali metals. They possess only one valence electron which they easily give up to form univalent positive ions or cations. Francium is a radioactive element.
The bonding and molecular polarity in a molecule of Cl2 is best described as...
a. non polar/polar
b. polar/polar
c. non polar/ nonpolar
d. polar/ ionic
Answer:
The bonding and molecular polarity in a molecule of CI2 is best described as palar / polar
The picture to the right is the crystal of a
diamond. Circle three individual atoms of
carbon
Are these the same type or different
atoms?
Answer:
Circle Any 3 Red Spheres
Explanation:
All of these atoms are Carbon (C), as diamond is a network solid composed entirely of Carbon. They are all the same.
Calculate the new volume in liters of a 0.500 L water bottle at 25.0 degrees when the plastic bottle is submerged in ice water at 1.00 degree Celsius.
Answer:
0.02L
Explanation:
Using the formula V1/T1 = V2/T2
Given
V1 = 0.5L
T1 = 25 degrees
T2 = 1 degree
V2 =?
Substitute
0.5/25 = V2/1
Cross multiply
25V2 = 0.5
V2 = 0.5/25
V2 = 0.02L
Hence the new volume will be 0.02L
How many moles of H2 gas are in 15 liters?
HELP ASAP!!! please chemistry sucks
Which of the following statements explains how the fossil record provides evidence that evolution has occurred?
Question 1 options:
A. The fossil record shows how the offspring of many different species are very similar
B. The fossil record shows the exact cause of physical and behavioral adaptations of organisms
C. The fossil record includes fossils of every organism that has ever lived
D. The fossil record shows how related organisms changed through evolution
Look at the diagram below.
+
Will this atom gain or lose electrons to achieve a stable configuration?
It will gain electrons to fill its outer shell.
It will lose electrons to be left with a full outer shell.
It depends on the situation.
It will neither lose nor gain electrons.
ASAP
Answer:
it will gain electrons to fill its outer shell
Explanation:
This element is boron which has 5 electrons.
How do you calculate the molar mass of a compound?
a
b
Add all the subscripts.
Find the molar mass of each individual element, multiply that molar mass number by
the element's subscript in the formula, and then add together.
Add 5 grams for each element in the formula.
Multiply the the subscripts by the atomic number.
С
d
Answer:
Find the molar mass of each individual element, multiply that molar mass number by the element's subscript in the formula, and then add together.
Explanation:
Two students performed a lab to see how the density and salinity of water are related. Both beakers began with the same salinity level. Beaker A was left alone, and B was placed under a heat lamp. Students will check the salinity level in the water after a day. The results of the investigation showed that…
Answer: the water avaperatid
because of the heat lamp
hope this helps
Explanation:
Which of the following reasons best explains why water isn
waxed surfaces? *
O the wax is a nonpolar substance that will not mix with polar wa
O the wax is a polar substance that will not mix with polar water
O the wax is a polar substance that will not mix with nonpolar wa
O the wax is a nonpolar substance that will not mix with nonpola
Answer:
the wax is a nonpolar substance that will not mix with polar water
Explanation:
Water is polar by due to the uneven distribution of charge between the hydrogen and oxygen. T=This automatically eliminates options 3 and 4.
Wax on the other hand is a non polar substance. Due to this non polar characteristic, it would not dissolve in water. The correct option is;
- the wax is a nonpolar substance that will not mix with polar water
(i) CH2=CH-CH2-CH=CH,
Give IUPAC name of the compound.
Answer:
The IUPAC name of CH3 – CH2 – CH2 – CH=CH2 is Pent-1-ene.
Help me out guys
:)
Answer:
2 chloride ion, Cl¯
Explanation:
The formula for calcium chloride is CaCl₂.
Next, we shall write the balanced dissociation equation for calcium chloride, CaCl₂. This is illustrated below:
CaCl₂ (aq) —> Ca²⁺ + 2Cl¯
From the balanced equation above,
We can see that calcium chloride, CaCl₂ contains 1 calcium ion, Ca²⁺ and 2 chloride ion, Cl¯.
Therefore, we can conclude that for every 1 calcium ion, Ca²⁺, there are 2 chloride ion, Cl¯.
You can fit 25 drops of substance X on a penny and 12 drops of substance Y on a different penny. Explain the difference in terms of strength of IMF.
Answer:
In the experiment performed involving the number of liquid drops that a penny can hold, 25 drops of substance X can fit in a penny while only 12 drops of substance Y can fit on another penny because, substance X is more viscous than substance Y. Thus, the intermolecular forces present in substance X are stronger than those present in substance Y.
Explanation:
Intermolecular forces (IMF) are the forces which exist between the neighboring molecules of a a substance. These forces, though weaker than intramolecular forces which acts between neighboring atoms, they still are responsible for several differences in the physical properties of substances with comparatively similar molecular masses.
The three major types of intermolecular forces are, hydrogen bonding, dipole–dipole interactions and London dispersion forces.
The existence of intermolecular forces in molecules of substances results in increase in melting and boiling points, surface tension, capillary action, viscosity, as well as surface area of substances,
Viscosity, which is the resistance to flow offered by a liquid increases with increase in the intermolecular forces between the molecules of a liquid.
In the experiment performed involving the number of liquid drops that a penny can hold, 25 drops of substance X can fit in a penny while only 12 drops of substance Y can fit on another penny because, substance X is more viscous than substance Y. Thus, the intermolecular forces present in substance X are stronger than those present in substance Y.
Which two types of rock could form after other rock melts into liquid
magma?
6 of 10 QUESTIONS
Sedimentary
Metamorphic
Intrusive igneous
Extrusive igneous
Answer:
The answer is intrusive igneous and extrusive igneous.
Explanation:
I’ve done the question on A P E X
A surplus (having “extra”) or deficit (having “fewer”) of electrons?
Answer:
Charge
Explanation:
A surplus (having "extra") or deficit (having "fewer") of electrons possessed by an object. A charge can cause attractive or repulsive forces which can be observed in some cases (e.g. pith balls, bits of plastic).
1. What do microorganisms share in common?
Answer:
Bacterial species are typified by their diversity. There are three notable common traits of bacteria, 1) lack of membrane-bound organelles, 2) unicellular and 3) small (usually microscopic) size.
Explanation:
What Are the Characteristics Common to All Bacteria?
Single-Celled. Perhaps the most straightforward characteristic of bacteria is their existence as single-celled organisms. ...
Absent Organelles. ...
Plasma Membrane. ...
Cell Walls. ...
DNA.
pleaseeeeeeeeeeee help me asap
my question is
'Scientists believe another Pangea is in Earth’s future. Explain why the evidence of tectonic plate motion supports this belief.'
help please and thank you
Answer:
eu nu insteleg ce zite
Explanation:
Answer:
We know that the movement of tectonic plates is a continuous process. Divergent plates cause the ocean floor to expand. Because of slab pull, subduction, and other processes, the landmasses keep drifting. Because of these movements, continents are continually moving apart from each other. It’s possible that one day they will collide to form a giant landmass and become another Pangea.
Explanation:
here^^
A sulfur atom weighs twice as much as an oxygen atom, If a chemist has 12grams of oxygen atoms, how many grams of sulfur would contain the same number of atoms as in the sample of oxygen atoms?
Answer: 24
Explanation: multiply 12 with 2
Which substances are made up of polymers?
DNA
a glass bottle
ice crystals
the proteins in hair
rubber car tires
Answer:
DNAA glass bottlethe proteins in hairRubber car tireAll these are made up of polymers.
How many grams is 40.48 moles of cobalt?
Answer:
2385.49 grams of cobalt.
Explanation:
1. Convert 40.48 moles of Co (cobalt) into grams (mass):
The molar mass of cobalt is 58.933195 g/mol.
[tex]40.48 mol Co = \frac{58.93 g/mol}{1 mol Co} = 2385.49 g[/tex]
2. Landmasses and bodies of water affects typhoon. Whichof thesedifferentiate the characteristics of landmasses and bodies of water?
A. Landmasses have more water vapour than bodies of water,
B. Landmasses produce strong wind and heavy rain while bodies of
water cannot.
C. Landmasses strengthen typhoon while bodies of water disrupt
the spin of a typhoon.
D. Landmasses disrupt the spin of a typhoon while bodies of water
strengthen typhoon.
Answer:
i think
D. Landmasses disrupt the spin of a typhoon while bodies of water
strengthen typhoon.
What happens when the pressure of a gas is decreased?
A. The number of molecules increases.
B. The diffusion rate increases.
C. The temperature increases.
D. The volume increases.
Answer:
The combined gas law states that the pressure of a gas is inversely related to the volume and directly related to the temperature. If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase.
Explanation:
Answer:
D. The volume increases.
Explanation:
100%
Select the correct answer.
In which reaction is precipitation occurring?
A.
MgCl2(aq) + CuSO4(aq) → CuCl2(aq) + MgSO4(aq)
B.
CdSO4(aq) + K2S(aq) → CdS(s) + K2SO4(aq)
C.
NaOH(aq) + NH4Cl(aq) → NaCl(aq) + NH4OH(aq)
D.
K2SO4(aq) + NaOH(aq) → K2OH(aq) + NaSO4(aq)
E.
HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(l)
Answer:
B. CdSO4(aq) + K2S(aq) → CdS(s) + K2SO4(aq)
Explanation:
A precipitate reaction is when a solid forms, so in this case CdS is the precipitate.
how many grams of caffeine are found in 6.500 x 10^22 molecules of caffeine?
Answer:
21.614 grams are found in [tex]6.5 \times 10^{22}[/tex] molecules of caffeine.
Explanation:
The chemical formula for caffeine is [tex]C_{8}H_{10}N_{4}O_{2}[/tex], the molar weight of caffeine is:
[tex]M = 8\cdot \left(12.011\,\frac{g}{mol} \right) + 16\cdot \left(1.008\,\frac{g}{mol} \right)+4\cdot \left(14.007\,\frac{g}{mol} \right)+2\cdot \left(15.999\,\frac{g}{mol} \right)[/tex]
[tex]M = 200.242\,\frac{g}{mol}[/tex]
According to Avogadro's Law, a mol of caffeine contains [tex]6.022\times 10^{23}[/tex] molecules. The number of grams contained in [tex]6.5 \times 10^{22}[/tex] molecules is determined by simple rule of three:
[tex]x = \frac{6.5\times 10^{22}\,molecules}{6.022\times 10^{23}\,molecules} \times 200.242\,g[/tex]
[tex]x = 21.614\,g[/tex]
21.614 grams are found in [tex]6.5 \times 10^{22}[/tex] molecules of caffeine.
Calculate how many grams of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al2O3).
4Al + 3O2 → 2Al2O3
i need this like rn please.
Answer:
0.347
Explanation:
Al is the limiting reagent.
Explanation:
The stoichiometry of the reaction is such that 4 moles of Al are required for every 3 moles of diatomic oxygen. This means that if the ratio of Al to diatomic oxygen is greater than 4/3, then the oxygen is the limiting reagent. If the ratio of Al to diatomic oxygen is less than 4/3, then Al is the limiting reagent.
The problem state that the ratio of Al to diatomic oxygen is
0.32
0.26
=
16
13
=
48
39
<
52
39
=
4
3
The ration of Al to diatomic oxygen is less than 4/3, so Al is the limiting reagent.
We can also see this if we ask the question "How much Aluminum" is required to completely react 0.26 moles of diatomic oxygen??
0.26
moles
O
2
×
4
moles
A
l
3
moles
O
2
≈
0.347
moles
A
l
So it would take 0.347 moles of Al to completely react with all of the oxygen, however there is only 0.32 moles of Aluminum present, so there is not enough Al to react with all of the oxygen, and so we say that the Al is the limiting reagent.
The mass of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃) is
What is mass?
Mass of any element is equal to the product of its number of moles and molar mass.
For the compound, Aluminum oxide (Al₂O₃)
The atomic masses of Aluminum is 23 and oxygen is 16.
Molecular or molar mass = ( 2 × 23 ) + ( 3 × 16 ) units
M = 46 + 48 = 94 units
The mass of Aluminum in 1 mole of aluminum oxide ,46 grams in 94 grams
Mass of Aluminum in the given 21.6 g of Aluminum oxide will be;
94 grams of Aluminum oxide contains 46 grams of Aluminum.
21.6 grams of Aluminum oxide will contain ( 46 / 94 ) × 21.6 = 10.57g of Aluminum.
Therefore, 10.57g of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃)
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