Number of electrons in a Ca²⁺ = 18
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20
Electron configuration of Ca : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²
When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:
[tex]\tt 20-2 = 18[/tex]
and the electron configuration (Ca²⁺ ) becomes:
1s², 2s², 2p⁶, 3s², 3p⁶
What are the circles around the nucleus called
Answer:
Electron Shells
Outermost level: Valence level
Explanation:
The number of atoms of any element in the given chemical formula is the number that is written on the food of the symbol of that element. The circles around the nucleus called shells or orbits.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound. In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus in circular path called orbit or shells.
Thus the circles around the nucleus called shells or orbits.
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Examination reveals that 180.2 g/mol of glucose contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen. How many g of hydrogen are there in 55.5 g of glucose?
Mass of Hydrogen = 3.7 g
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
180.2 g/mol of glucose-C₆H₁₂O₆ contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen
Remainder Hydrogen :
[tex]\tt 180-(72.1+96)=11.9~g/mol[/tex]
% mass of Hidrogen in Gllucose :
[tex]\tt \dfrac{11.9}{180}\times 100\%=6.61\%[/tex]
So mass of Hydrogen in 55.5 g Glucose :
[tex]\tt 6.61\%\times 55.5~g=3.7~g[/tex]
Write one paragraph!!!!!reasons why the minimum wage should be increased.
Answer:
There are pros and cons, I will explain mostly pros. After all the pros outweigh the cons.
Explanation:
Increasing the minimum wage can be letting people work less or earn more. This can have a major impact on the economy in America. It can reduce poverty within some families households. A con concerning this though is that people who work for low pay can lose their jobs and their family can become poor. It can also affect the federal minimum wage.
Hopefully this helped you out a lot. Please make sure to make my answer brainliest. Have a great rest of your day or night
Answer:
Minimum wage increases allow people to work less and earn more. This may have a significant influence on the American economy. It can help some families get out of poverty. People who labor for little compensation risk losing their employment and being unable to provide for their families, which is a drawback. As a result, the federal minimum wage may also be affected.
Explanation:
plzzz brainlest
How many grams of O2 are in 1.51 x 1023 molecules?
Group of answer choices
8.00 g
0.251 g
4.00 g
16.0 g
Answer:
I think is c 4.00 g
Explanation:
that was my answer
A material that conducts electricity only at high temperatures.
A.Semiconductor
B.Compound
C.Luster
D.Brittle
Answer:
Semiconductor
Explanation:
Semiconductors conduct electricity as the temperatures increase.
Hope this helped.
What must occur in order for matter to change states?
A.
A chemical change must occur.
В.
The temperature must change.
C. Heat must be added or removed.
D.
Other substances must be added.
Answer:
C. Heat must be added or removed
Explanation:
When matter changes states it is due to the overall loss or gain of heat. In addition, heat being added or removed is what will cause a temperature change, but a simple temperature change is not enough to change states. For example, a temperature could go from 50 degrees to 51. This will not cause a change in states. So heat must be added or removed in order for matter to change states.
Please Help ASAP Students set up a controlled experimernt. They put five
crickets in each of three identical containers. They set one
container to 15C, one to 20°C, and one to 25°C. Then they
count the number of cricket chirps in each container during
1 hour. What are the two constants in this experiment? You have to pick to answers.
A: The number of crickets in each container.
B: The temperature of each container.
C: The number of cricket chirps.
D: The kind of containers used.
Answer: A
Explanation:in learned this last year:)
A: The number of crickets in each container. and
C: The number of cricket chirps.
are possibly the right answers
Find the number of moles of argon in 534 g
of Argon
Answer:
13.4 mol Ar
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
534 g Ar
Step 2: Identify Conversions
Molar Mass of Ar - 39.95 g/mol
Step 3: Convert
[tex]534 \ g \ Ar(\frac{1 \ mol \ Ar}{39.95 \ g \ Ar} )[/tex] = 13.3667 mol Ar
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
13.3667 mol Ar ≈ 13.4 mol Ar
Answer:
The number of moles in 452 grams of Argon is 13.31 moles.
Explanation:
in the equation 3x-3=18 what is x?
Answer:
x=7
Explanation:
3x-3=18
-3 moves over the 18 side and becomes +3.
18 + 3 =21
3x=21
now you need to divide 3 with 21 giving you 7
Answer:
The answer is seven bc X is seven.
8.
A student measured the mass of a rubber stopper to be 6.00 grams. When it was placed into a
graduated cylinder that initially had 2.0 mL of water, the water went up to the 5.0 mL of water. What is
the density of the rubber stopper?
a) 3.0 g/mL b) 1.2 g/mL
d) 0.60 g/mL
e) none of these
$) 2.0 g/mL
Answer:
A
Explanation:
Because you subtract the amount it was after it want up by the initial amount
Which statement best describes the position of a coastal area during a low
tide?
A. It is on a side of Earth that is perpendicular to the Moon.
B. It is on the part of Earth that is experiencing nighttime.
C. It is on the part of Earth that is experiencing daylight.
D. It is on a side of Earth that faces the Moon directly.
Answer:
A is the correct answer
Explanation:
Moon pulls the ocean upwards causing tides
The position of a coastal area during a low tide is: it is on a side of Earth that is perpendicular to the Moon.
What happens during low tide?Whenever the absolute bottom, or the box, arrives at a coast, the coast encounters a low tide. Envision the sea is molded like a ball pointing at the moon. The football's sharp closures address the pieces of the Earth encountering elevated tide and the ball's level sides are the pieces of the earth encountering low tide.
Thus, option A is correct.
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The following model was used to show a molecule of methane, or CH4. Describe the number and type of each atom of the molecule. Fill blank boxes with the right answer. The blue sphere represents atom(s) of the element The red sphere represents atom(s) of the element
Answer:
Also attached model picture
Explanation:
This question is incomplete because it does not include the image of the model. But it can be answered based on my previous knowledge.
A CH4 atom has 4 hydrogen atoms and 1 carbon atom.
Methane is a chemical compound classified as a hydrocarbon whose chemical formula is CH4. This compound is found in nature in the form of a gas and has no odor or color. It originates as a result of the decomposition of plants.
According to its chemical formula CH4, it can be inferred that methane is made up of one carbon atom and four hydrogen atoms.
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What is the purpose of the zigzag line on the right side of the periodic table?
a) It marks the border between the alkali metals and the transition metals.
b) It indicates a family of elements that have the same chemical properties.
c) It connects the elements in the table that have the same atomic number.
d) It divides the metals and nonmetals, and shows where the metalloids are.
Answer:
D.
Explanation:
The membrane enclosing the nucleus of an eukaryotic cell is
called the nuclear ___
Answer:
It's called the nuclear envelope.
The Earth takes approximately 365.25 days to revolve around
the Sun. To account for the time beyond 365 days, we add a
day to the calendar
The Earth takes approximately 365.25 days to revolve around
the Sun. To account for the time beyond 365 days, we add a
day to the calendar
that's right
What is responsible for the blue sky?
Answer:
The blue color of the sky is caused by the scattering of sunlight off the molecules of the atmosphere.
Explanation:
Answer:
sun shine
Explanation:
Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time
11) Predict the products of this reaction.
CuSO4(aq) + 2KOH(aq) →
A) Cu(OH)2(aq) + K2SO4(s)
B) Cu(OH)2(s) + K2SO4(aq)
C) CuOH(s) + K2SO4(aq)
D) CuOH2(s) + K2SO4(aq)
Answer:
6FCRXCTV
Explanation:
ED5RF6GT7HY8JU9KI0LO-;PJH7YNG6GDAnswer:
b
Explanation:
a p e x
Which of the following compounds results from the formation of an ionic bond?
A) H2O
B)NO2
C)NaCl
D)CO2
Answer:
my answer is a I think but i an not sure
The compound that results the formation of an ionic bond is
C) NaCl
What is Ionic bond?It is a type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
Out of the given options only NaCl i.e. sodium chloride is an ionic compound that is formed by a formation of two ions which are sodium and chloride ions.
Thus, option C is correct.
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The energy required to break the bonds for an exothermic reaction to occur is called the _ energy.
Answer:
This stored chemical energy, or heat content, of the system is known as its enthalpy.
Explanation:
Due to the absorption of energy when chemical bonds are broken, and the release of energy when chemical bonds are formed, chemical reactions almost always involve a change in energy between products and reactants.
Using the VSEPR theory , what would the representation mean A central atom with 2 connected atoms atom with I lone pair of Jone pair of electrons electrons with 2 connected atoms to the central atom central atom with 2 pairs of lone pair none of these electrons and commected atom to the central
Answer:
The molecule has a bent geometry
Explanation:
Let us look again at the principles of VSEPR theory. The shape of a molecule depends on the number of electron pairs that surround the valence shell of the central atom in the molecule.
Lone pairs distort the molecular geometry away from what is expected on the basis of VSEPR theory.
The molecule described in the question has the form AEX2. Two substituents and one lone pair form three electron domains around the central atom. The expected geometry is trigonal planar but the observed molecular geometry is bent because of the lone pairs present.
help fast please it's timed
Answer: B its most likely
I think it would be d if I am wrong im am sorry
If a mutation changes one base, but the amino acid does not change, what type of effect would this have on the organism?
Neutral
Beneficial
harmful
how to name iupac compounds
Answer:
In order to name organic compounds you must first memorize a few basic names. These names are listed within the discussion of naming alkanes. In general, the base part of the name reflects the number of carbons in what you have assigned to be the parent chain. The suffix of the name reflects the type(s) of functional group(s) present on (or within) the parent chain. Other groups which are attached to the parent chain are called substituents.
Question 25 pts
(03.01 MC)
The table shows the total number of electrons in Atom A and Atom B.
Atom Number of Electrons
A 10
B 12
Which statement is correct? (5 points)
Group of answer choices
A will give up two electrons to form bonds.
B will give up two electrons to form bonds.
Both A and B will be chemically unreactive.
Both A and B will gain electrons to become stable.
Answer:
B will give up two electrons to form bonds.
Explanation:
B has 12 electrons, it means that the electronic configuration of B is; 1s2 2s2 2p6 3s2. The implication of this is that B must be an element of group 2 since it has an outermost electron configuration of ns2.
The elements of group 2 form ionic bonds by loss of two electrons. This implies that B will form bonds by loss of two electrons.
The statement i.e. correct is B will give up two electrons to form bonds.
The following information should be considered:
B has 12 electrons, it means that the electronic configuration of B is; 1s2 2s2 2p6 3s2. It represent that B must be an element of group 2 since it has an outermost electron configuration of ns2. The elements of group 2 form ionic bonds by loss of two electrons. This implies that B will form bonds by loss of two electrons.
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Explain what the difference is between chemical properties, extensive physical properties, and intensive physical properties.
ill award brainliest for right answer
Answer:
Extensive properties, such as mass and volume, depending on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.
Explanation:
lennox needed $5400 to buy a refrigerator.
he borrowed this sum of money years at 13% per annum from a bank .
how many dollars does he owe the bank?
Answer:
he owes the bank 87%
Explanation:
PLS HELP
What is the correct order for this food chain?
A) grass, lion, bacteria
B) antelope, lion, grass
С) antelope, bacteria, grass
D) grass, antelope, lion
Answer:
Creo que es D) grass, antelope, lion
Explanation:
El antílope se alimenta de hierba y el león del antílope.
In an ecosystem, the correct order for the food chain is grass, antelope, lion.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.
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Green plants convert light energy from the sun into what during photosynthesis
Answer: It turns the energy from the sun into a food for the plant.
I hope this helps, and Stay Safe! :)
it tuns the light into food
A red-colored female New Hampshire Red chicken mated with a red-colored male New Hampshire Red chicken and produced golden-colored offspring. Which statement best explains how the offspring could inherit a trait not shown in the phenotypes of either parent?
Answer:
See the answer below
Explanation:
The statement that could best explain how the offspring could inherit a trait not shown in the phenotypes of either parent would be that both parents are heterozygous for the red color.
Heterozygous parents can produce offspring with a phenotype that is distinctly different from that of either parent if the recessive alleles come together during random fusion of gametes.
Let us assume that the red color (R) in the New Hampshire chicken is the dominant one and the recessive one is the golden color (r). The genotype of the heterozygous parents would be Rr.
Rr x Rr
RR Rr Rr rr
There is a probability (1/4) of producing a golden color chicken (rr), a trait that is not displayed in either of the parents.
If an acid has the formula HCO2H, what would be the charge on the CO2H’ion?
negative 2
negative 3
negative one
positive two
positive one
Answer:
b
Explanation:
