Answer:
35.62%
Mass percent composition of K = 0.3562 x 100% Mass percent composition of K = 35.62%
Explanation:
True or False: Once the formulas for the reactants and the products are determined, the subscripts may not be changed.
Answer:
true
Explanation:
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what is the mass number for an atom that has 36 protons 36 electrons and 40 neutrons
Answer:
76
Explanation:
Mass number = number of protons plus the number of neutrons
So, 36 + 40 = 76
Can someone double check my work? (Ideal Gas Law Equation)
I am solving for the amount of moles in two gases.
For one, it was 4.75mL at 0.5C (273.65K) and 1.2atm.
n=(1.2*4.75)/(0.0821/273.65)=(5.7/22.456)=0.25361653 moles
For the other gas, it was 4.6mL at 0.5C and 1.2atm.
n=(1.2*4.6)/(0.0821/273.65)=(5.52/22.456)=0.24581403 moles
Please double check these for any errors in math or whatever. Thank you.
I did not see any errors, i may be wrong but what i can see is that it is correct
Name
12. A chemist places a piece of solid magnesium in an aqueous solution of copper (II)
sulfate and notices a reaction. Pieces of solid copper dropped out of the solution as a
precipitate and magnesium sulfate was formed.
a) Give a balanced formula equation (with state symbols) for this reaction (3 marks)
Answer:
Explanation: Mg(s) + CuSO4 (aq) -> Cu(s) + MgSO4 (aq)
In a polar bond, ____
are not shared equally between atoms.
Explanation:
Polar Covalent Bonds. A polar
covalent bond exists when
atoms with different
electronegativities share
electrons in a covalent bond.
Consider the hydrogen chloride
(HCI) molecule. Each atom in
HCI requires one more electron
to form an inert gas electron
configuration.
In which type of atom would radioactive decay most likely occur?
Group of answer choices
Radioactive decay will most likely occur in an atom with 26 protons.
Radioactive decay will most likely occur in atoms that have gained or lost electrons to form charged ions.
Radioactive decay will most likely occur in an atom that has more protons than electrons.
Radioactive decay will most likely occur in an atom with an unstable number of protons and neutrons in its nucleus.
Answer:
4
Explanation:
How many moles of ammonia, NH3, are in 51 grams of NH3?
Answer:
grams NH3 is equal to 0.058718113128665 mole.
Explanation:
Answer:
3 moles
Explanation:
Use the mole = mass/mr equation
so, mole = 51/17 = 3 moles
Explain your observations in term of how tempurature affects paritcle motion and how liquid changes to a solid
Answer:
See explanation
Explanation:
Temperature is defined as a measure of the average kinetic energy of the molecules of a body.
When a substance is heated, the kinetic energy of its molecules increases as the temperature increases; hence the particles of the substance moves faster with increasing temperature.
When heat is withdrawn from a liquid, the temperature decreases and the average kinetic energy of the molecules decreases. The molecules become less energetic hence the liquid changes into solid
HELP MEEE PLEASEEEEEEEEEEEEEE
I think its the sea cucumber and sea urchin
but it could be the star too
What type of substance do these statements describe?
- It is a long chain.
- It contains carbon, hydrogen, and oxygen atoms.
- It has double bonds.
- It is insoluble in water.
- It is used for energy storage in living things.
carbohydrate
lipid
monosaccharide
protein
Answer:
lipid
Explanation:
I just know the answer i don't really have a explanation sorry
Answer:
lipid
Explanation:
edge 2021
Just help please
And does anybody know Johnny from NCT
What happens to pressure if temperature increases? Pressure increases. Pressure stays the same. Pressure decreases. Temperature has no effect on pressure.
Answer:
Pressure increases
Explanation:
According to Gay-Lussac's law, the pressure of a given amount of gas is directly proportional to the temperature at a given volume i.e.
[tex]P\propto T[/tex]
It means the relationship between the pressure and the temperature is direct.
If the temperature increases, the pressure of the gas also increases. Hence, the correct option is (A).
4. A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of
her walk than in the second 15 minutes,
What can she conclude about her walk?
A she walked over many hills
B
her average speed was faster during the first part of her walk
C. she walked in two different directions
D. she was walking at a constant speed
Calcium carbonate decomposes into
calcium oxide and carbon dioxide.
The mass of calcium carbonate that
decomposes is 57 g. At the end of
the experiment, the mass of the
products were only 45 g. What can
we conclude from this information?
Answer:
The mass of carbon dioxide formed is 12g.
Help on 2 and 3 due tomorrow pls help
Answer:
2
b= they are grouped differently, but all the atoms are still there.
Which structure is found in producers in nearly all ecosystems?
A. stems
B. chloroplasts
C. leaves
D. rhizomes
Please help :)
It’s a science thing for 7th grade
Answer: The first question is chemical The second one is Physical
Explanation:
The wave pictured represents a sound wave. Which label along the wave represents a sound with the LOWEST energy?
A)
A
B)
B
o
C
D)
D
Answer:
21
Explanation:
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The wave which is having higher frequency is associated with higher energy. In the given wave, the part B is labelling the lowest energy sound.
What are sound waves ?Sound waves are longitudinal mechanical waves passing through a medium. In a longitudinal wave the oscillation of particles is in a direction along the wave propagation.
A sound wave is composed of rarefactions and compressions. The area where, the particles have some separation with lower pressure is called rarefactions.
The area of high pressure where, the oscillating particles are closely packed is called compression of the wave. As the frequency of the wave increases, its energy increases, Therefore, the less frequency part B represent lowest energy sound.
Find more on sound waves:
https://brainly.com/question/11797560
#SPJ6
When a strontium atom loses two electrons to form an Sr2+ ion, the electrons are lost from the
a. 5s orbital. c. 3d orbital.
b. 5p orbital. d. 4f orbital.
Answer:When a strontium atom loses two electrons, it becomes a(n) cation with a charge of 2+. when any neutral atom loses an electron it becomes cation that is positively charged ions and an ion gets the charge according to the number of electrons loses.
you are very welcome but I may be inaccurate.
Bob sees some water droplets on the outside surface of a glass of lemonade. What process of the water cycle explains this?
A. condensation
B. evaporation
C. precipitation
D. transpiration
Answer:
es la a porque ay está condensación por
How do you explain the ability of nonmetals to attract electrons to themselves?
Answer:
When these chemical bonds form, atoms of some elements have a greater ability to attract the valence electrons involved in the bond than other elements. Electronegativity is a measure of the ability of an atom to attract the electrons when the atom is part of a compound. Electronegativity differs from electron affinity because electron affinity
HOPE IT HELPS
Explanation:
Answer:
it is electronegativity and it increases as you move up and to the right on the periodic table and nonmetals are situated to the top right of the periodic table
Explanation:
HELP ASAP !!! PLS ITS DUE IN LIKE 4 MINUTES
Answer:
they have the same structures in common
A solute can be obtained from a solution by...
Answer:
Evaporating the solvent
Explanation:
please help i genuinely don’t know what to do
Please Help :))) "A solution with a concentration of 5.7 x 10^-7M would be considered..."
Answer:
The solution is acidic.
Explanation:
To know which option is correct, we shall determine the pH of the solution. This can be obtained as follow:
Concentration of Hydrogen ion [H⁺] = 5.7×10¯⁷ M
pH =?
pH = –Log [H⁺]
pH = –Log 5.7×10¯⁷
pH = 6.2
pH scale reads as follow:
0 to 6.9 => Acidic
7 => Neutral
8 to 14 => Alkaline / basic
The pH of the solution (i.e 6.2) falls between 0 and 6.9 which indicates acidic.
Therefore, the solution is acidic.
object with a mass of 30 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required
Which ion concentration does the pH scale measure? How long is the scale?
If an atom the atomic number 10 and the mass number 12, how many VALENCE electrons does it have?
is it true or false?
Answer:
The rainforest is teeming with animals and insects, so you would hear humming. Frogs and birds make some of the loudest rainforest sounds.
howler monkeys, are the loudest so i think that its false cause lost of animals are there but some can be quiet
If peanut butter wasn't called peanut butter.. what would it be called?
Answer:
I have no idea
Explanation: