Answer:
0.01125
Explanation:
:b
helpppppppppp meeeeee
Answer:
It's false. We can not alter the formula of the substance involved in a chemical reaction.
PLEASE HELP , 50 points!
Write the electron configuration of a -2 ion with 16 protons.
Answer:
1s^2 2s^2 2p^6 3s^2 3p^6
Explanation:
Number of electrons = Number of protons. Originally, sulfur has 16 protons, but the question asks states 2- ions. So S^(2-), or a total of 18 protons. Follow the rules, and make sure the exponents add up to 18. 2 + 2 + 6 + 2 + 6 = 18 electrons.
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Meg ran 100 meters in 7.8 seconds. Linda ran 100 meters in 14.5 seconds. Which statement is correct?
Linda's speed was faster than Meg's speed.
Linda's speed was slower than Meg's speed.
Linda and Meg traveled the same distance at the same rate.
Linda and Meg traveled the same distance over a certain time.
At 25 degrees what is the [H+] and pH of a solution with a [OH] = 3.2 x 10^8 M?
Answer:
0.4699
Explanation:
C12H22O11 is an example of a(n):
ionic compound
empirical compound
molecular compound
salt compound
Answer:
molecular compound
Explanation:
it has two or more nonmetal elements and are covalently bonded
What are some key properties of metalloids?
Explanation:
Metalloids have a solid state of matter. In general, metalloids have a metallic luster. Metalloids have low elasticity, they are very brittle. Middleweight are semi conducted elements, and they allow leave the average transmission of heat.What is the process whereby stars create elements heavier than hydrogen?
atomic growing
atom splitting
nucleosynthesis
hydrogenation
Answer:
nucleosynthesis
Explanation:
The correct answer is nucleosynthesis.
How do stars create heavier elements?After the hydrogen in the star's core is exhausted, the star can fuse helium to form progressively heavier elements, carbon and oxygen, and so on, until iron and nickel are formed. Up to this point, the fusion process releases energy. The formation of elements heavier than iron and nickel requires an input of energy.
What was the process of the formation of heavy elements?In a supernova explosion, neutron capture reactions take place (this is not fusion), leading to the formation of heavy elements. This is the reason why it is said that most of the stuff that we see around us comes from stars and supernovae (the heavy elements part).
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why do ionic compound form crystals ?
Answer:
Ions bound together by electrostatic attraction form ionic crystals.Stability of ionic solids depends on lattice energy, which us released in the form of heat when two ions are brought together to form a solid. Lattice energy is the sum of all the interactions within the crystal.Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.
Which statement best describes these three components of air?
O Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
O Oxygen, nitrogen, and carbon dioxide can be classified as elements.
idio
Answer:
option A
Explanation:
hope it helps
An organic compound containing C, H, O gives the following data on analysis. Composition by mass: %
C = 52.2, % H = 13.0, % 0 = 34.8. Relative molecular mass = 46. Identify the molecular formula of the organic compound.
My answer is C2H6O. Is it correct?
Help please!! I thought it was 374.8 but it keeps saying to check my significant digits
Answer:
ok
Explanation:
i am doing now so
Which of these mixture is a solution
Answer:
A. Sugar and water
Explanation:
Because water can dissolve sugar
Aluminum reacts with chlorine gas according to the following equation shown below. How many
moles of Cl2 are required to react with 0.062 mol of Al?
2 Al(s) + 3 Cl2(g) → 2 AIC13()
_mol
Answer:
nCl= 0,062x3/2=0,093(mol)
Explanation:
Yo can someone explain the heat of fusion and heat of vaporization thing to me?
Answer:
The heat of fusion is the amount of energy required to change a solid into a liquid at its melting point. When a liquid becomes a solid, freezing or solidification has occurred. The heat of vaporization is the energy required to change a liquid into a gas at its boiling point.
Explanation:
need boy who is at leaast 12
Answer:
helloo!!!!!!! I am 12 :)
PLEASE HELP!!!!!!!!!!!!!
Which option would be an appropriate model of nuclear fission?
A. dividing a stack of paper equally between two people
B. taking a teaspoon of sugar from a bowl
C. disturbing a drop of water such that it breaks into smaller droplets
D. cutting a cake in half
Answer:C
Explanation:
help meeee I BEG YOU!
ora
If a student is combining two
substances and sees bubbles and
is probably taking
fizzing, a
place.
A. chemical change
B. physical change
Answer:
A a chemical change
Explanation:
because a chemical change is when you mix tow substance together and they creat a new substance
If I have 1000ml of water and 10 ml of water, which will have the greater density? Why?
Answer:
1000 ml
Explanation:
hope it helpssssssss
Answer:
1000 ml because the bigger ml the greater density brainliest pls
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what is the difference between an element and an isotope
Answer:
An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.
Explanation:
I hope you have a nice day and please mark me(:
Answer: Elements are simply what you see on the periodic table. E.g. carbon, oxygen, hydrogen etc. Isotopes are elements with different masses. ... So isotopes have the same amount of protons but with different amounts of neutrons.
Explanation: plz mark brainliest!
from the illustration of the potassium atom fill in the periodic table selection
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
What element does “X” represent in Figure 1?
Helium
Krypton
Neon
Argon
Answer:
Argon
Explanation:
It's atomic number is 18
hope that's it
how do you determine the total number of Valence electrons that are used to make a particular lewis structure for a compound or an ion?
Answer:
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized.
Explanation:
Hope it helps!
why do ionic compound are good insulator ?
need a proper answer please
Answer:
Ionic compounds conduct electricity when molten or in aqueous solution, because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
Explanation:
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why is the Universal Law of Gravitation is a scientific Law and not a theory?
There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?
A. keeping the volume constant and replacing the light particles with heavy particles
B. keeping the pressure constant and increasing the temperature
C. keeping the volume constant and cooling the container
D. keeping the temperature constant and increasing the container volume
There are 300 light particles in an airtight container. The adjustment that would increase the speed of the particle is keeping the pressure constant and increasing the temperature. Option B is correct.
The speed of a particle is the distance traveled by one molecule of a substance. Particles travel as a result of the kinetic energy they possess.
The kinetic energy attributed to each particle rises as the temperature rises.
As a result, in 300 light particles, the particles will travel more quickly when the temperature is increased while the pressure of the particle remains constant.
Therefore, we can conclude that the adjustment that would increase the speed of the particles is keeping the pressure constant and increasing the temperature.
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A solution made from pure Potassium hydroxide contained 1.85 g of Potassium hydroxide in exactly 200 cm3 of water. Using phenolphthalein indicator, titration of 20.0 cm3 of this solution is carried out v/s sulphuric acid. 9.35 cm3 of sulphuric acid solution is required for complete neutralisation. [atomic masses: K= 39, O = 16, H = 1]
(a) write the equation for the titration reaction.
(b) calculate the molarity of the Potassium hydroxide solution. (c) calculate the moles of Potassium hydroxide neutralised. (d) calculate the moles of sulphuric acid neutralised.
(e) calculate the molarity of the sulphuric acid.
The concentration of H2SO4 is 0.176 M. The number of moles of H2SO4 is 0.0165 moles.
The equation of the reaction is;
2KOH(aq) + H2SO4(aq) ------> K2SO4(aq) + H2O(l)
The number of moles of KOH = 1.85 g/56 g/mol = 0.033 moles
concentration = number of moles /volume
volume = 200 cm3 or 0.2 L
concentration of KOH = 0.033 moles/0.2 L = 0.165 M
From the titration formula;
CAVA/CBVB =na/nb
CA = concentration of acid
VA = volume of acid
CB = concentration of base
VB = volume of base
na = number of moles of acid
nb = number of moles of base
Making CA the subject of formula;
CA = CBVBna/VAnb
CA = ?
CB = 0.165 M
VA = 9.35 cm3
VB = 20.0 cm3
na = 1
nb =2
CA = CBVBna/VAnb
CA = 0.165 M × 20.0 cm3 × 1/9.35 cm3 × 2
CA = 0.176 M
The concentration of sulphuric acid is 0.176 M
From the reaction equation;
2 moles of KOH reacts with 1 mole of H2SO4
0.033 moles of KOH reacts with 0.033 moles × 1 mole/2 moles
= 0.0165 moles of H2SO4
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Hi ! ❤️looking for help you can look at my past questions. giving brainliest if able to
Fill in the blanks. Liquid B is ____________________ then liquid A and liquid B would ___________________ liquid A.
1: more dense, sink under
2: less dense, sink under
3: more dense, float on top of
4: less dense, float on top of
Answer:
I think it's number one option
What is the word "love" really mean to someone? when do you know when the time is right
The penalty for not voting in New South Wales is a $55 fine. You must respond within 28 days of the issue date of the notice. You will have four options: If you voted, you can provide details of where and when using our non-voter self-service portal.
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If F1 is equal to F2 and F4 is greater than F3, which statement is correct?
An unbalanced force will move the box up.
An unbalanced force will move the box down.
Several balanced forces will keep the box stationary.
Several balanced forces will keep the box moving towards the right.
"An unbalanced force will move the box down"
I could be wrong but I tried
And it's ok if you don't give brainliest to me
But I hope this helped:)
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