Answer:
A. The remains or impression of a prehistoric organism preserved in a petrified form or as a mold or cast in a rock
Explanation:
A.the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
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
"All is strange and vague."
"Are we dead?"
"Or is this Ohio"
-Animaniacs
Oh yeah, brainliest if you can answer this question :3
Answer:
This is Ohio.
Explanation:
(no dude im dead i live in kentucky XP)
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 .
advantages and disadvantage of chemistry
Answer:
it's good because u learn about chemicals and fumes
irs bad because some smells are just horrible
what type of element is usually shiny
Answer:
Metal
Explanation:
Answer:
Explanation:metals
What is the outer energy level and sublevel used in the electron configuration for potassium?
Select one:
a. 4s
b. 3s
c. 3p
d. 4p
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
What type of reaction is: 4 Fe + 3 O2 → 2 Fe2O3
A. synthesis
B. double replacement
C. decomposition
D. single replacement
Answer:
A. synthesis
Explanation:
The reaction given is a synthesis reaction in which two substances combines to give a product.
In this reaction:
4Fe + 3O₂ → 2Fe₂O₃
The reaction involves the formation of a single product from two or more reactants.
The formation of a compound from union of the constituent elements also falls into this category of reaction.
A nuclear equation is balanced when?
A balanced nuclear reaction equation indicates that there is a rearrangement during a nuclear reaction, but of subatomic particles rather than atoms. Nuclear reactions also follow conservation laws, and they are balanced in two ways: The sum of the mass numbers of the reactants equals the sum of the mass numbers of the products.
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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.
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How might the molecules inside an ice pack be different from the liquid inside of an insulated cup?
Answer:
The molecules inside the ice pack are frozen therefore they are stuck in place. The molecules inside an insulated cup aren't frozen but still stuck inside of their container so that they can not fly out.
Explanation:
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:
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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why is a bannana curved?
Answer:
Explanation:
It's because of the sun! Bananas are curved so they can retrieve sunlight.
give him the brainliest
Which additional product balances the reaction H2SO4 + 2NaOH → Na2SO4 + ? 2H2O 2OH H2O2 H3O
Answer:
a) 2H2O
Explanation:
I took the quiz
Answer:
2H20 or A- the other person was right:) give them brainliest.
Explanation:
I just took the test.
in terms of energy, the difference between a short wavelength and a longer wavelength
Full in the blanks...
Whoever answer first will get marked brainliest
Answer:
atom, ions, protons neutrons, atomic number
Explanation:
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:
The pH of 0.259 M solution of an unknown acid is measured to be 2.353. What is the Ka of the acid?
Answer:
[tex]Ka=7.73x10^{-5}[/tex]
Explanation:
Hello!
In this case, since the pH is measure of the amount of hydrogen ions in solution, first given the pH we can compute the concentration of hydrogen ions via:
[tex]pH=-log([H^+])[/tex]
[tex][H^+]=10^{-pH}=10^{-2.353}=4.436x10^{-3}M[/tex]
Thus, since the ionization of the given acid, leads to the following equilibrium expression as it is a weak one:
[tex]Ka=\frac{[H^+][A^-]}{[HA]}[/tex]
We notice the concentration of hydrogen ions equal the concentration of the acids conjugate base, so we can compute:
[tex]Ka=\frac{4.436x10^{-3}*4.436x10^{-3}}{0.259-4.436x10^{-3}}\\\\Ka=7.73x10^{-5}[/tex]
Best regards!
18 protons
22 neutrons
18 electrons
how do i draw this ? please help ASAP.
Explanation:
You need to remember a few things if you want the answer to this question...
A atom has a circle within a circle so consider that it looks like a double circle..Protons and neutrons go in the center of that double circle..Electrons go on the outer sides of the two circles.Because of the given numbers of protons, neutrons, and electrons we know that the element you need to draw is Argon.Therefore you need to draw a atom that is similar to this:
Hope this helps.
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.
if one knows the mass and the molar mass of product D in a chemical reaction, one can determine the mass of product D procued by using the?
Answer:
Number of moles
Explanation:
Using the number of moles in chemical reactions, we can determine the quantity of products and even the reactants that are combining to form them.
The number of moles is derived using the expression below is;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Once we establish the number of moles of any of the specie given from the mass and molar mass, we can relate it to any other species.
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
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.
What is the formula for Mercury (I) Bisulfate?
Answer:
Work shown below!
Explanation:
[tex]Hg^{+1} HSO_{4} =HgHSO_{4}[/tex]
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 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.
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Write the complete and balanced combustion reaction for H2+O2—>
Answer:
2H2 + 02 --> 2H20
Explanation:
H2 + 02 --> H2O
H =2x2 = 4 | H = 2 x 2 = 4
|
O =2 | O = 1 x 2 = 2
dm me if u have questions regarding the solution hihi :)
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.Scientists study and record seismic data and volcanic activity in order to support: Convection in the Lithosphere Theory of Plate Tectonics Sea Floor Spreading Theory of Continental Drift
Answer:
Theory of Plate Tectonics
Explanation:
Scientists especially Geologists study and record seismic data and volcanic activities in order to support the theory of plate tectonics.
The theory of plate tectonics suggests that the earth is broken into slabs called the lithosphere that moves over the fluid asthenosphere below.
The use of seismic data presents scientists with a way of vertically looking deep into the earth. Volcanic activities also presents us with the kind of materials down within the earth. Also, coupled with this data, scientists use GPS sensors to monitor the rate of movement of the earth. When studying plate tectonics, it invariably culminates in the study of sea floor spreading and theory of continental drift.