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2 . how many moles are present in a 12.65g of potassium(k)?
Answer:
0.324 mol
Explanation:
Mass of one mole or atomic mass of potassium is 39 g. Thus, number of moles in 12.65 g of potassium is 0.32 moles.
What is atomic mass?Atomic mass of an element is the mass of one mole of that element. One mole of an element contains 6.022 × 10²³ atoms. This number is called Avogadro number.
Potassium is 19th element n periodic table. It is an alkali metal in the first group. The atomic mass of potassium is 39 g/mol. This is the mass of one mole of potassium. The chemical symbol of potassium is K.
Given mass of potassium = 12.65 g
atomic mass = 39 g/mol
number of moles in 12.65 g = mass/ atomic mass
no.of moles = 12.65 /39 = 0.32 moles.
Therefore, the number of moles of 12.65 g of potassium is 0.32 moles.
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Which statement about alkane molecules is correct?
A They burn in oxygen.
B They contain carbon, hydrogen and oxygen atoms.
They contain double bonds.
D They contain ionic bonds.
Answer:
B
Explanation:
B
4.What system is the system that takes in oxygen and releases carbon dioxide.
skeletal
muscular
circulatory
respiratory
How many grams are in 0.35 moles of C2H4? please show dimensional analysis
Answer:
9.8g
Explanation:
Using periodic table find molar mass of C and H:
C=12.01g/mol
H=1.008g/mol
Molar mass of C2H4=(12.01)2+(1.008)4=28.03g/mol
Using molar mass times moles of the chemical to find the mass in 0.35 moles of c2h4:
28.03 x 0.35=9.8grams
In an ideal situation where no heat energy is produced, what is the relationship between the chemical energy provided by the battery and the electrical energy produced according to the Law of Conservation of Energy?
Answer:
See explanation
Explanation:
The principle of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another. Hence, chemical energy in a battery can be converted to electrical energy.
Usually, the conversion of energy from one form to another is not 100% efficient according to the second law of thermodynamics. Some energy is wasted in the process, sometimes as heat.
Hence, in an ideal situation where no heat energy is produced; all the chemical energy is converted to electrical energy (100% energy conversion). There will be no energy loss if no heat is produced.
potassium solid and aqueous zinc chloride react to produce what?
K (s) + ZnCl (aq) ====》 KCl ( aq) + Zn (s)
SERE
Which of the following is an input for cellular respiration?
а.
CO2
b. H2O
C. sunlight
d. O2
Please select the best answer from the choices provided
A
B
оооо
С
Answer:
d. oxygen (O2) is the answer
CaCN2 + 3H20 - CaCO3 + 2NH3
What is the percent yield if 15.5 g of NH3
is produced upon reaction of 65.5 g of CaCN2
and 451 g of water? The molar mass of CaCN2
is 80.11 g/mol and the molar mass of CaCO3
is 100.09 g/mol.
1. 1.79 %
2. 14.5 %
3. 69.7 %
4. 89.75 %
5. 27.8 %
6. 55.8 %
7. 80.15 %
Answer:3
Explanation:
1. A student mixes two liquids together and notices that a white solid has formed
at the bottom of the container.
What can the student conclude?
1. A precipitate has formed.
2. A physical change has occurred.
3. A chemical reaction has occurred.
4. A chemical change has occurred.
Answer:
3. A chemical reaction has occured
A student mixes two liquids together and notices that a white solid has formed at the bottom of the container which means precipitate has formed.
What is precipitation reaction ?
Precipitation is the process of creating an insoluble compound in chemistry by either reacting two salts or altering the temperature to alter the solubility of the compound. Additionally, the solid that results from a precipitation reaction is referred to as "precipitate."Precipitation can be a sign that a chemical reaction has taken place, but it can also happen if the concentration of a solute is higher than its solubility. The process of small, insoluble particles aggregating together or forming an interface with a surface, such as the container wall or a seed crystal, is known as nucleation, and it occurs before precipitation.Precipitation is the process of transforming a liquid into a solid. A precipitant is a chemical that gives rise to a solid in a liquid solution. The term "precipitate" refers to the resulting solid. In the event that the molecule size of the insoluble compound is tiny or there is deficient gravity to attract the strong to the lower part of the compartment, the hasten might be equitably dispersed all through the fluid, shaping a suspension. Any process that separates the precipitate from the solution's liquid portion, known as the supernatant, is referred to as sedimentation. Centrifugation is a common technique for sedimentation. A "flower" is a powder that forms after the precipitate has been recovered.
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How many grams of sodium are in 2.10 x1022 atoms of sodium?
preferably on picture so i can see your work
Answer:
124
Explanation:
412345+-424443+2432
a bowling ball and a baseball both roll across your foot at the same speed.the bowling ball hurts much more
Answer:
It hurts more because of the greater mass of the bowling ball.
Explanation:
Gravity exerts a greater force on the bowling ball because of its mass, pushing it harder into your leg while it's rolling over it.
For a theoretical yield of 23 g and actual
yield of 11 g, calculate the percent yield for a
chemical reaction
whats the answer
A kicked soccer ball
eventually comes
to rest. What
force causes
this?
ce
Answer:
friction
Explanation:
jwjwkkskskaksksk
I need this ASAP no wrong answer please. (50) points and branliest
Which of the following is NOT true of DNA and RNA
1. DNA can leave the nucleus, RNA can't
2.DNA is double-stranded, RNA is single stranded
3.RNA has Uracil, DNA has Thymine
4. Both carry the genetic code
Answer: 1
Explanation:
DNA never leaves the nucleus
Answer:
1. DNA can leave the nucleus, RNA can't is the answer.
Explanation:
If a certain material is not permitted by these receptors to leave or enter the nucleus, it can’t. DNA is not among the materials that have the permission to leave and enter the nucleus. RNA, on the other hand, can leave and enter the nucleus to perform its functions, but this leaving and entering movements don’t occur without regulation.
PLEASE HELP
A student labels two 250 milliliter beakers with the letters A and B. She puts 100 milliliters of water in each of them. She adds some salt to beaker A and stirs until the salt dissolves completely. Then she adds another 50 milliliters of water to beaker A. She adds more salt to beaker B, and the salt in beaker B doesn't completely dissolve in the water even after much stirring. The solution in beaker A is The solution In beaker B is
Answer:
Solution B is saturated and solution A is unsaturated
Explanation:
Saturated solution contains the maximum concentration of a solute dissolved in the solvent (usually water) and if extra solute is added to saturated solution, that solute will not dissolve.
Unsaturated solution means that more of a substance can be dissolved (in this example salt).
Which pieces of equipment are
needed to calculate the velocity of a
falling object?
A stopwatch and balance
B speedometer and magnet
C compass and tape measure
D tape measure and stopwatch
10g of marble was added to 15 grams of dilute hydrochloric acid, product formed is calcium chloride, water and carbon dioxide. which of the following is true?
Answer:
Hydrochloric acid is the excess reactant
Explanation:
I got it right lol
The correct answer is Option B.
Hydrochloric acid is the excess reactant.
Explain about exothermic reaction?An exothermic reaction is one in which energy is given off as heat or light. In contrast to an endothermic reaction, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.Calcite in marble and limestone dissolves when sulfurous, sulfuric, and nitric acids in polluted air and rain react with it. We observe roughened surfaces, the removal of material, and the loss of carved details in exposed areas of buildings and statues.Because of its basic nature, the calcium carbonate in marble neutralizes the hydrochloric acid in the reaction described above. A base is defined as "a compound that reacts with an aqueous solution of an acid to produce a water and salt solution in which the salt gets separated into its component ions." Any extra salt that remains after a given salt solute has saturated the aqueous solution precipitates out of the solution.To learn more about exothermic reaction refer to :
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5. Write a paragraph about chemical reactions
in everyday life, that cause pollution of the
environment.
Answer:
company smokes
wastes (liquid and solid)
What are the major parts of the ecosystem
Answer:
Ecosystems have lots of different living organisms that interact with each other. The living organisms in an ecosystem can be divided into three categories: producers, consumers and decomposers. They are all important parts of an ecosystem. Producers are the green plants.
Explanation:
Hope this helps
can some one help whith these
Answer:
what is this pdf I cannot see your question
Which one is the right answers?
how do you balance equations?
Answer:
In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal
Explanation:
Answer:
what he said so you can give him brainliest
Explanation:
please help me with this question
Answer: I believe it would be B. Genus
Explanation:
I looked up the definitions for you and genus is defined as the group above species. Picture of definition attached.
If a balloon with a volume of 10L at 500kpa is heated until the balloon has a temperature of 300°C, 750atm and now has a volume of 100mL. What was the original temperature of the balloon (in °C)
Answer:
103.6°C
Explanation:
We solve this problem, with the Ideal Gases Law. We know that moles of gas are not changed through time.
P . V = n . R . T
So n (number of moles) and R (Ideal Gases constant) are the same, they are cancelled. In the two different states, we can propose:
P₁ . V₁ / T₁ = P₂ . V₂ /T₂
We need to make some conversions:
100 mL . 1 L/ 1000mL = 0.1L
500 kpa . 1atm / 101.3 kPa = 4.93 atm
300°C + 273 = 573 K
We replace data:
4.93 atm . 10L / T₂ = 750 atm . 0.1L / 573K
4.93 atm . 10L = (750 atm . 0.1L / 573K) . T₂
(4.93 atm . 10L) / (750 atm . 0.1L / 573K) → T₂
T₂ = 376.65 K
We convert K to °C → 376.65 K - 273 = 103.6 °C
PLEASE HELP No links or fake answers or ill report you and every question you have ever answered to getnur acc deleted. I have no idea how to shower these. Ty if you help and I will give brainliest and like and 5 stars. xx
Answer:
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Two charged particles repel each other with a force of F.
How would the magnitude of this force change if the charge on one of the particles was doubled?
- it would decrease to one-fourth of what it was.
- it would decrease to half of what it was.
- it would increase to four times what it was.
- it would increase to twice what it was.
Answer:
it would increase to twice what it was
If aluminum nitrate reacts with calcium phosphite, what is the balanced coefficient of aluminum nitrate?
Answer:
The coefficient of aluminum nitrate is 2.
Explanation:
The reaction between aluminum nitrate and calcium phosphite is:
Al(NO₃)₃ + CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂
Now, we need to balance the equation. Let's begin with phosphite anion. On the reactant side we have 1 molecule of the anion, and on the products side we have 3 of it, so we need to add a coefficient of 3 before CaHPO₃:
Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂
The number of Ca atoms on the reactants side is now 3 and on the products side is 1, so we need to add a coefficient of 3 as follows:
Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂
The reactants side has 1 atom of Al, and the products side has 2. Let's add a coefficient of 2 on the reactant side:
2Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂
Finally, the nitrate anion has 6 molecules on the reactant side, which is equal to the number of molecules of NO₃⁻ on the product side.
Hence, in the balanced equation, we have a coefficient of 2 in aluminum nitrate.
I hope it helps you!
number 3 ...................
_____________Makes the particles of the solvent and the solute move around more and come in contact more often. More contact, more opportunity for dissolving.
Answer:
Solvation
Explanation:
Solvation is the name of the process in which the particles of the solute are surrounded by the particles of the solvent molecules and they together mix together to form a solution.
In order words, it is a process of the surrounding solute particles with the solvent particles in order to form a solutions. When the water is the solvent, the process is known as hydration.
It only occurs when the particles of the solvent and solute are in contact with each other and the opportunity for the dissolving process is more when more is the contact between the particles.
5 - What is the pH of a solution with a
pOH of
8.6? What are the [+] and [OH']
concentrations?
Answer:
the pH solution is 4.9.
[[tex]H^{+}[/tex](aq)] = [tex]10^{-pH}[/tex]
Explanation: