Answer:
a. 4s
Explanation:
The outer energy level and sublevel used in the electron configuration for potassium is the 4s sub-level.
Potassium has 19 electrons.
The electronic configuration of this chemical element is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
The outermost energy level is the 4s
Which scientist established the law of octaves?
Antoine Lavoisier
Dmitri Mendeleev
Henry Moseley
John Newlands
Answer:
John Newlands
Explanation:
he established the law of octaves
what type of element is usually shiny
Answer:
Metal
Explanation:
Answer:
Explanation:metals
All matter can be classified as two main types of materials. Identify below 6 points whether each of these is one of the two main types of matter.
Answer:c
Explanation:
PERIODIC TABLE TEST WILL GIVE BRAINLIEST!
Helium is a gas found in the earth.
A.True
B.False
Neon is a gas from the earth. *
A.True
B.False
Elements are pure substances. *
A.True
B.False
Families/Groups on The Periodic Table go in this direction. *
A.vertical
B.horizontal
Rows which are called _______ run horizontal on The Periodic Table. *
A.pecans
B.periods
C.perfect
Click all that apply. Matter is found in ____________. *
A.clothing
B.humans
C.plants
D.cars
The worlds most accurate clock is a _____________. *
A.Timex
B.Rolex
C.Atomic
Humans are made of 99% elements. *
A.True
B.False
A grain of sand is the same size as one atom. *
A.true
B.false
The Periodic Table has _______ elements. *
A.112
B.116
C.96
Answer:
1. True
2. True
3. True
4. Vertical
5. periods
6. All the given options
7. Atomic
8. False
9. False
10. 116
Thank you again :-D
Answer:
1. True
2. True
3. True
4. B. vertical
5. B. periods
6. A, B, C, D
7. C. Atomic
8. B. false
9. A. True
10. A. 112
Explanation:
1. Helium is a natural gas found in the atmosphere and below ground.
2. Neon is also natural gas found in Earth's atmosphere and can be seen on the periodic table.
3. An element is considered a pure substance because it is made up of only one type of atom and cannot be broken down into a simpler form.
4. Families/groups go up and down (vertical), while periods go across (horizontal)
5. As I just mentioned, periods run horizontally on the Periodic table.
6. Matter is everything that takes up space and has mass. Therefore, all of the given answers consist of matter. Why else would they matter? :)
7. The title of the "Most Accurate Clock In The World" goes to the British atomic clock at UK's National Physical Laboratory (NPL).
8. Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. Therefore, we consist of more that 99%.
9. A grain of sand is relatively small; about the size of one atom.
10. The periodic table has 112 elements because there were 112 elements before IUPAC reviewed elements 113, 115, 117 and 118, and decided to give them official names and symbols. This was relatively recent. The total number of elements is 118 though.
I would like to apologize in advance if any of these were incorrect.
Calculate the molarity of a solution prepared by diluting 125 mL of 0.400 M K2Cr2O7 with 875 mL of water?
0.057 M is the molarity of a solution prepared by diluting 125 mL of 0.400 M [tex]K_2Cr_2O_7[/tex] with 875 mL of water.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Given:
[tex]V_1[/tex] =125 mL
[tex]V_2[/tex] =875 mL
[tex]M_1[/tex] =0.400 M
[tex]M_2[/tex] =?
[tex]M_1 V_1[/tex]=[tex]M_2V_2[/tex]
0.400 M x 125 mL = [tex]M_2[/tex] x 875 mL
0.05714285714 =[tex]M_2[/tex] = 0.057 M
Hence, 0.057 M is the molarity of a solution prepared by diluting 125 mL of 0.400 M [tex]K_2Cr_2O_7[/tex] with 875 mL of water.
Learn more about moles here:
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What is the mass (in grams) of a CO_2 gas sample that occupies 5.46 L at STP?
Answer:
10.7g of [tex]CO_{2}[/tex]
Explanation:
Any gas at STP occupies 22.4 L/mol.
As such:
5.46/22.4 = 0.244 mol of [tex]CO_{2}[/tex]
mass = mol * molecular weight = 0.244 * 44 = 10.7g of [tex]CO_{2}[/tex]
The mass of a CO₂ gas sample that occupies 5.46 L at STP is 10.7 grams.
What is STP?STP is defined as to enable comparisons between various sets of data, consistent sets of settings for experimental measurements must be defined. The abbreviation STP stands for standard temperature and pressure. Standard temperature and pressure refers to 273.15 K (0 C) and 1 bar, respectively (exactly 105 pascals ). For scientists to be able to compare different sets of data in a meaningful way, a global standard for temperature and pressure must be established.
At STP, any gas takes up 22.4 L/mol.
Thus, 5.46/22.4 = 0.244 moles of CO2
Mass, which is one mole times the molecular weight of 44 molecules
= 0.244 moles x 44
= 10.7 grams.
Thus, the mass of a CO₂ gas sample that occupies 5.46 L at STP is 10.7 grams.
To learn more about STP, refer to the link below:
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A structural engineer is using this table to design a wall to protect a city near the ocean. How high should the engineer build the wall? 50 meters 100 meters 150 meters 200 meters
Answer: it is D
Explanation: got it wrong so y’all can get it right
Answer:
D. 200 meters
Hope this helps!
Explanation:
Impulse is ___ momentum.
A. only a decrease in
B. a change in
c. not related to
D. only an increase in
Answer:
option B is correct
Explanation:
impulse is a change in momentum
What is the work done in lifting 60 kg of blocks to a height of 20 m
Answer:
1200 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 60 × 20
We have the final answer as
1200 JHope this helps you
Please don’t answer if you just want points
What is the empirical formula of the substance C6H14010?*
Answer:
[tex]\mathrm {CH_24}[/tex]
Explanation:
To determine the molecular formula, enter the appropriate value for the molecular mass. We get [tex]CH_{2}4[/tex] as our answer to the question.
A force of attraction between the opposite of charges of the ions in an lonic compound is called what?
Answer:
Ionic bonds
Explanation:
The force of attraction between the opposite charges of the ions in an ionic compound is called an ionic bond.
An ionic bond results from the electrostatic force of attraction between oppositely charged ions.
This attraction creates an ionic or electrovalent bond.
The bond type is usually between a metal ion and a non-metal ion.When is a roman numeral most likely needed in the name of an ionic compound?
A. When more than one polyatomic ion appears.
B. When the anion is a polyatomic ion.
C. When more than one cation is used in the formula.
D. When the cation is a transition metal.
Answer:I think it's d but I could be wrong
HELP FASTTT
a. list the following from smallest atomic size to the largest atomic size.
B, Si, As, Te
Explanation:
se
te
as
b
wish you the best on this assignment love, god bless you my dear .
How many grams of copper (II) nitrate would be produced from 0.80 g of copper metal reacting with excess nitric acid?
Answer:
[tex]m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]
Explanation:
Hello!
In this case, since the chemical reaction between copper and nitric acid is:
[tex]2HNO_3+Cu\rightarrow Cu(NO_3)_2+H_2[/tex]
By starting with 0.80 g of copper metal (molar mass = 63.54 g/mol) and considering the 1:1 mole ratio between copper and copper (II) nitrate (molar mass = 187.56 g/mol) we can compute that mass via stoichiometry as shown below:
[tex]m_{Cu(NO_3)_2}=0.80gCu*\frac{1molCu}{63.54gCu} *\frac{1molCu(NO_3)_2}{1molCu} *\frac{187.56gCu(NO_3)_2}{1molCu(NO_3)_2} \\\\m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]
However, the real reaction between copper and nitric acid releases nitrogen oxide, yet it does not modify the calculations since the 1:1 mole ratio is still there:
[tex]4HNO_3+Cu\rightarrow Cu(NO_3)_2+2H_2O+2NO_2[/tex]
Best regards!
Amount of copper (II) nitrate would be produced is 2.25 gram
Molecular mass:Given that;
Amount of copper metal = 0.80 g
Find:
Amount of copper (II) nitrate would be produced
Computation:
Cu + 4HNO₃ → Cu(NO₃) + 2NO₂ + 2H₂O
Number of moles = Given mass / Molecular mass
Number of moles = 0.80 / 63.5
Number of moles = 0.012 mol
So,
n = Given mass / Molecular mass
0.012 = Given mass / 63.5 + (63.5 + 48)
Given mass = 2.25 gram
Amount of copper (II) nitrate would be produced = 2.25 gram
Find more information about 'Molecular mass'.
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Full in the blanks...
Whoever answer first will get marked brainliest
Answer:
atom, ions, protons neutrons, atomic number
Explanation:
in terms of energy, the difference between a short wavelength and a longer wavelength
advantages and disadvantage of chemistry
Answer:
it's good because u learn about chemicals and fumes
irs bad because some smells are just horrible