Answer:
2 hydrogen
5 fluorine
1 boron
1 lithium
How many grams of potassium (K) contain 5.11 x 10^22 atoms of potassium?
The atomic mass of K is 39
from Avogadro's law
39g of K contains 6.02x10^23 atoms
therefore if
39=6.02x19^23
X=5.11×10^22
making X the subject of the formula
X= (5.11×10^22×39)÷6.02×10^23
X= 33g
The statement, that describes grams of potassium (K) contain 5.11 × [tex]10^{22}[/tex] atoms is "33.1 g."
What is an atom?An atom is a fundamental particle of matter that contains at least one proton.
1 mole will be of 6.022 × [tex]10^{23}[/tex] atoms
Then,
[tex]= 5.11*10^{22} \;atoms\;.\;\frac{1\;mol}{6.022*10^{23} \;atoms} \;.\;39.098\;g/mol\\\\= 33.171\;g[/tex]
≈ 33.1 g
As a result, 33.1 g of K contains 5.11 × [tex]10^{22}[/tex] atoms.
Hence, the correct option is 33.1 g.
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how many moles of of Al are needes to form 2.43 mol of Al2Br6?
A. 7.29 mol
B. 1.22 mol
C. 2.43 mol
D. 1.62 mol
E. 4.86 mol
Answer:
c
Explanation:
c .
answer
your
this
questions
What is equivalent to 750 joules
Answer:
0.179254 kilocalories
Explanation:
divide the energy value by 4184
[tex]0.179254[/tex] that would be your answer
Is a compound a mixture or a pure substance
Answer:
A compound is a pure substance.
helppppppppppppppppppppppppppp
Answer:
C is the correct option.
Explanation:
When water reaches 100°C it starts evaporating and the molecules of water turns to vapor.
Why do both nuclear and chemical
changes occur?
Answer:
The change in energy for a chemical reaction has to do with the potential energy of the electrons. The change in energy for a nuclear reaction has to do with the potential energy of the nucleus. The change in energy for a nuclear change is many orders of magnitude larger than for a chemical change.
The statement that describes both nuclear and chemical changes occur is "potential energy."
What is nuclear and chemical reaction?Nuclear reactions include a change in the nucleus of an atom, which usually results in the production of a different element. Chemical reactions, on the other hand, require just electron rearrangement and no changes in nuclei.
A nuclear reaction is any reaction that causes the nucleus of an atom to change. An atom's nucleus is made up of protons and neutrons. It seems to reason that a nuclear reaction alters the amount of protons and/or neutrons in an atom.
Chemical changes occur when bonds between molecules or atoms are broken and/or formed to form a new material. In this case, the new substances' qualities differ from the old, the particles differ, and the number of particles can alter.
The change in energy for a nuclear change is many orders of magnitude greater than the change in energy for a chemical change.
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Describe how you could show by adding aqueous sodium hydroxide and aqueous ammonia that a solution contained zinc ions.
Result with sodium hydroxide
Excess sodium hydroxide
Result with aqueous ammonia
Excess aqueous ammonia
Answer:
*result with sodium hydroxide: white ppt of Zn(OH)2
*excess sodium hydroxide: Precipitate dissolves to form a COLOURLESS solution
*Result with Aqueous ammonia: White ppt of Zn(OH)2
*excess aqueous ammonia: Precipitate dissolves to form a COLOURLESS solution
In the preparation of a certain alkyl halide, 10 g of sodium bromide (NaBr), 10 mL distilled water (H20), and 9 mL 3-methyl-1-butanol (C5H120) were mixed in the round-bottomed flask and allowed to cool for 2 -3 minutes. Then while swirling the flask, 10 mL sulfuric acid (H2SO4) was slowly added to the flask and the mixture was refluxed and later distilled. The mass of the pure product obtained was 6.48 g. Sodium hydrogen carbonate (NaHCO3) was used to remove impurities. (Density of 3-methyl-1-butanol is 0.810 g/mL). The percentage yield will be?
Percentage yield shows the amount of reactants converted into products. The percentage yield of the reaction is 51.7%.
The equation of the reaction is sown in the image attached. The reaction is 1:1 as we can see.
Number of moles of NaBr = 10 g/103 g/mol = 0.097 moles
We can obtain the mass of 3-methyl-1-butanol from its density.
Mass = density × volume
Density of 3-methyl-1-butanol = 0.810 g/mL
Volume of 3-methyl-1-butanol = 9 mL
Mass of 3-methyl-1-butanol = 0.810 g/mL × 9 mL
Mass of 3-methyl-1-butanol = 7.29 g
Number of moles of 3-methyl-1-butanol = mass/molar mass = 7.29 g/88 g/mol = 0.083 moles
Since the reaction is 1:1 then the limiting reagent is 3-methyl-1-butanol
Mass of product 1-bromo-3-methylbutane = number of moles × molar mass
Molar mass of 1-bromo-3-methylbutane = 151 g/mol
Mass of product 1-bromo-3-methylbutane = 0.083 moles × 151 g/mol
= 12.53 g
Recall that % yield = actual yield/theoretical yield × 100
Actual yield of product = 6.48 g
Theoretical yield = 12.53 g
% yield = 6.48 g/12.53 g × 100
% yield = 51.7%
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What is condensation
It is important to understand that while the absorbance value is related to the amount of light absorbed by a sample, it is not equal to or directly proportional to the amount of light absorbed. Consider a situation where 100 photons of light pass through a sample. After the light passes through the sample, 64 photons are detected. a) How many photons were transmitted through the sample
When 100 photons of light pass through a sample and 64 photons are detected after the passage of light, the number of photons transmitted through the sample is 64.
This is based on the methods of calculating the absorbance of light, which is depicted as the higher the amount of light transmission, the lower the amount of light absorbed.
Thus, when 64 photons of light in 100 photons are detected, 64 photons are transmitted, and therefore, the number of photons absorbed is 36.
Hence, hypothetically, if 100 photons of light are transmitted, 0 photons of light will be absorbed.
Therefore, in this case, it is concluded that the correct answer is 64 photos.
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the pH of soil X is 7.5 while that of soils Y is 4.5 which of the two coils should be treated with powered talked to adjust its PH
Answer:
Soils Y
Explanation:
• The soils with lower pH are acidic so they react readily with powdered.
[tex].[/tex]
Answer:
SOIL Y
the soil with lower ph are acidic
wat are the dangers of chemicals in the laboratory
What is wrong with this model of the atom.
Answer:
A. The neutrons and electrons are in the wrong place.
Explanation:
The atom's nucleus contains both protons and neutrons, whilst the electrons are arranged in shells around the nucleus.
HELP SOON PLEASE THIS IS DUE TONIGHT! I WILL GIVE BRAINLIEST!
In an experiment where you use wires, a 9 volt battery, and a light bulb; what would be the best conductor to put on the ends of the wires? Please rate the following solution/liquids and their brightness from 1-5
-Tap water
-Baking soda
-Vinegar
-Coca Cola (or any soda, I guess)
Answer:
I would say baking powder maybe or you should try tap water
Answer:
1st one - tap water (ill go over them one by one to help you understand why)
Its honestly rather vinegar or tap water but if I would go with tap water however I could be wrong. I don't take your class lol
Step by step:
First, tap water includes a lot of ions and contaminants. As a result, tap water only contains ions capable of conducting electricity. As a result, tap water is an excellent electrical conductor.
2nd) Ammonia and baking soda are both weak bases. When weak electrolytes dissolve in water, the resulting solution has a low conductivity.
Third, because it releases H+ and CH3COO- ions, the mobility of these ions in the solution assists in electrical conduction. As a result, vinegar is a good electrical conductor.
4th) When dissolved in water, soda compounds (chemicals mostly containing sodium) include ions, and ions assist conduct electricity. As a result, it does not conduct because it lacks ions or charged particles.
Butanoic acid + 2 propanol
Answer:
propyl butanoate
Explanation:
Please help me I can’t figure it out
1. Calculate the wavelength of light with a frequency of 1.89 x 1018 Hz.
a
Answer:
1.92402 kilohertz
Explanation:
hope this helps
Answer:
• From wave equation :
[tex]{ \rm{v = f \lambda}}[/tex]
v is velocity, v = 3.0 × 10^8 m/sf is frequencylambda is the wavelength[tex]{ \rm{3.0 \times {10}^{8} = (1.89 \times {10}^{18}) \times \lambda}} \\ \\ { \rm{ \lambda = \frac{3.0 \times {10}^{8} }{1.89 \times {10}^{18} } }} \\ \\ { \boxed{ \rm{ \: \lambda = 1.587 \times {10}^{ - 10} \: }}}[/tex]
5. The density of a gas is lower than the density of a liquid because:
a. gas atoms are smaller than liquid atoms.
b. gas atoms are larger than liquid atoms
c. atoms in a gas are farther apart than atoms in a liquid.
d. atoms in a gas are closer together than atoms in a liquid
Answer:
c
Explanation:
the gas is further apart and the liquid is closer together
According to the law of conservation of matter, which statement about chemical reactions is true? A. Atoms cannot be created or destroyed by chemical reactions. B. Atoms are created by some reactions and destroyed by others. C. Energy is created as atoms are destroyed in chemical reactions. D. Every atom destroyed in a chemical reaction must be replaced.
what is the resonance structure of xef4
Answer:
The Lewis structure for XeF4 has a total of 36 valence electrons. When we are done adding valence electrons we check each atom to see if it has an octet (full outer shell). We also need to check to make sure we only used the number of available valence electrons we calculated earlier (no more, no less).
Explanation:
600.0 ml of a 0.385 M solution of LiCl is diluted to 900.0 ml. What is the new concentration of the solution.
Taking into account the definition of dilution, the new concentration of the solution is 0.2567 M.
First of all, you have to know that dilution is the reduction in concentration of a chemical in a solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volumeof the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volume
In this case, you know:
Ci= 0.385 M Vi= 600 mL= 0.600 L (being 1000 mL= 1 L) Cf= ? Vf= 900 mL= 0.900 LReplacing in the definition of dilution:
0.385 M× 0.600 L= Cf× 0.900 L
Solving:
Cf= (0.385 M× 0.600 L)÷ 0.900 L
Cf= 0.2567 M
In summary, the new concentration of the solution is 0.2567 M.
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Answer:
group 1 element 6
group 2 element 3
group 11 element 1
group 14 element 2
group 17 element 4
group 18 element 5
Explanation:
Answer:
Explanation:
group 1 element 6
group 2 element 3
group 11 element 1
group 14 element 2
group 17 element 4
group 18 element 5
4. Some biologists declare "structure determines functions." The 3-D molecular geometry in small molecules (or units of molecules) are critical in the final shape of larger structures. Give an example, not found in your notes or textbook that illustrate how a change a final shape can affect how the structure functions (or how other substances interact with it) and explain your choice.
1. ATOMIC RADIUS: For each of the following sets of atoms, rank the atoms from smallest to largest atomic radius.
a. Li, C, F
b. Li, Na, K
c. Ge, P, O
d. C, N, AI
Answer:
The answer is letter C
What is the source of the magma that erupts from a volcano?
outer core
inner core
mantle
Earth's oceans
Answer:
the magma comes from the mantle
Please help me. I can’t give too much points bc I don’t have too much.
QUANTUM=
The relationship between energy and frequency=
E = hy
EN
h=
V=
Albert Einstein: PHOTONS
What are acids ? Will they harm skin
Hydrochloric acid can cause damage if it comes into contact with your lungs, eyes, stomach, or skin. If hydrochloric acid comes into contact with your skin, it can cause: chemical burns. scarring.
Determine the amount of grams present in 3.25x1024 atoms of Lithium.
In which species does sulphur have the more negative oxidation number? Answers: A. H2S B. S8 (elemental form of sulphur) C. H2SO3 D. K2SO4
Answer:
H2S
Explanation:
the oxidation number of S is -2.
How many molecules are in 8.27 mol of SiH,?
Answer:
from,
moles,n = number of particles, N
Avogadro constant
N = 8.27 * 6.022×10^23
N = 4.98 × 10^ 24particles.
In 8.27 moles of SiH, there are
4.98 × 10^24particles.
WILL MARK BRAINLY
Under what conditions will a low temperature make a reaction spontaneous?
O A. If AH and AS are both positive
O B. If AH and AS are both negative
O c. If a catalyst is used in the reaction
O D. If the reaction is endothermic
Answer:
B
Explanation:
If AH and AS are both negative will a low temperature make a reaction spontaneous.
What is Spontaneous reaction?A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. A roaring bonfire (see figure below) is an example of a spontaneous reaction.
A fire is exothermic, which means a decrease in the energy of the system as energy is released to the surroundings as heat.
The products of a fire are composed mostly of gases such as carbon dioxide and water vapor, so the entropy of the system increases during most combustion reactions.
Therefore, If AH and AS are both negative will a low temperature make a reaction spontaneous.
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