Answer:
0.4 M
Explanation:
The process that takes place in an aqueous K₂HPO₄ solution is:
K₂HPO₄ → 2K⁺ + HPO₄⁻²First we calculate how many K₂HPO₄ moles are there in 200 mL of a 0.2 M solution:
200 mL * 0.2 M = 40 mmol K₂HPO₄Then we convert K₂HPO₄ moles into K⁺ moles, using the stoichiometric coefficients of the reaction above:
40 mmol K₂HPO₄ * [tex]\frac{2mmolK^+}{1mmolK_2HPO_4}[/tex] = 80 mmol K⁺Finally we divide the number of K⁺ moles by the volume, to calculate the molarity:
80 mmol K⁺ / 200 mL = 0.4 M11. A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height of a seat-top. If the
mass of the loaded cart is 3,500g and the height of the seat top is 0.45 meters, then what is the potential energy of the
loaded cart at the height of the seat-top?
Answer:
15.75 J
Explanation:
Potential energy
= mgh
= 3,500 g × 10 m/s² × 0.45 meters
= 3.5 kg × 4.5 m²/s²
= 15.75 J
What coefficient is needed to balance the reaction
CaCl2 + H2CO3 → CaCO3 + HCI?
Answer:
CaCl2 + H2CO3 -> CaCO3 + 2HCl
Explanation:
Balancing this equation was a relatively simple example. Making sure to have all parts on the left equal to the ones on the right is the most important part.
Ca 1 = 1
Cl 2 = 2
H 2 = 2
C 1 = 1
O 3 = 3
Answer:2HCl
Explanation: just did it
18) Max can lift 180 x 104 grams with ease. How much is this in pounds
Answer:
41.184 pounds
Explanation:
Calculate the total grams first.
180 x 104 = 18,720 grams
Convert that into kilograms (kg)
18,720g 1 kg
------------ X ------------- = 18.720 kg
1 1000 g
Convert kilograms into pounds.
18.729 kg 2.2 lb
--------------- X ----------- = 41.184 lb (pounds)
1 1 kg
Write a balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO).
Answer:
2Ca +O2 ----------> 2CaO ( Balanced Reaction)
The balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO) is
Ca + O2 --> CaO2
Heya are balanced equations?A balanced chemical equation is an equation in which the the number of atoms of each elements on both the reactant and products sides are equal.
Calcium oxide is an alkaline which is solid at room temperature and is formed by the reaction of one atom of calcium and two atoms of oxygen.
Therefore, the balanced equation of formation reaction of solid calcium oxide (CaO) is Ca + O2 --> CaO2.
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Select the statements that correctly describe an meteoroid. Check all that apply
largest of the space rocks.
smallest of the space rocks
when in the atmosphere, they are called a meteor
they never come near Earth
Answer:
they are the smallest of space rocks, when in the atmosphere they are called meteors.
Explanation:
i think this is right.
Another way to say density
A. Density
B. Mass divided by volume
C. Water
D. Element
In chemistry, densities of substances are often compared to the density of this substance.
A. Density
B. Mass divided by volume
C. Water
D. Element
These have unique densities associated with them.
A. Density
B. Mass divided by volume
C. Water
D. Element
Answer:
A
Explanation:
Another way to say Density is Density
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The density is mass divided by volume. the correct option is option A.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water. Density is mass divided by volume.
Mathematically, density can be written as : Density = Mass of the substance÷ volume marked on the graduated cylinder. Density is directly proportional to mass and inversely proportional to volume. Density of water is 1 gram per cubic centimeter.
Therefore, density is mass divided by volume. the correct option is option A.
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Helpppp meeeee!!! I beg you
Answer:
True
Explanation:
what would the heat transfer be if you are making macaroni and it rises and falls in a pot on the stove ?
freezing point depression is
A reaction occurs that results in a molecule with two atoms of the same element. The atoms share six electrons. Which molecule could be the product of the reaction?
Si2
N2
O2
F2
Answer:
n2 is correct
Explanation:
i took it just now. :)
The product of this reaction could be N2.
Among the options, only atoms of nitrogen have five electrons on their outermost shell.
The fact that they have five electrons in their outermost shells implies that they can combine by sharing six electrons in a triple bond.
When this occurs, each of the nitrogen atoms involved in the bond now has an octet of electrons. Hence, the product formed when the atoms share six electrons. Which molecule could be the product of the reaction is N2.
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What trophic level has heterotrophs?
a only the second level
b all levels except the first
C only the first level
d only the last level
Answer the image I took, I’m studying for a test, and this specific question is hard
Answer:
specific question is hard for me too
Giving brainliest!!!!!!!!!!!!!
I am the first one to comment, please give me the brainliest <3
What is the function of the load in
an electric circuit?
Please answer please
Answer:
1k km
Explanation:
calculate the boiling point elevation for solution of 25.0 grams of menthol in 130 grams of ethanol. Ethanol boiling point elevation constant is 1.22 oC/m
Answer:
Explanation:
When a solute is added to a solvent, the vapor pressure of the solvent (above the resulting solution) is less than the vapor pressure above the pure solvent. The boiling point of a solution, then, will be greater than the boiling point of the pure solvent because the solution (which has a lower vapor pressure) will need to be heated to a higher temperature in order for the vapor pressure to become equal to the external pressure (i.e., the boiling point).
The boiling point of the solvent above a solution changes as the concentration of the solute in the solution changes (but it does not depend on the identity of either the solvent or the solute(s) particles (kind, size or charge) in the solution).
I cant give you the answer but I hope this helps.
Hydrogen protons collide with one another to create:
A). Helium and energy.
B). Boron and energy.
C). Carbon monoxide and energy. D). None of the above.
Can somebody please help me do the last part of the paper with the help of the information on top
Answer:
i dont know the answer of this question... im sorry
caulculate the number of mass of 0.25 mol of carbon dioxide molecules
Why do you think some seasons are more likely than others to experience a tornado
PLEASE PLEASE HELP ME WITH THIS ASAP
Answer: 3.45
Explanation:
¿Qué son las fuerzas intramoleculares?
Respuesta:
Las fuerzas intermoleculares que actúan entre las moléculas se clasifican en : Dipolos permanentes. Dipolos inducidos. Dipolos dispersos.
Explicación:
Dentro de una molécula, los átomos están unidos mediante fuerzas intramoleculares (enlaces iónicos, metálicos o covalentes, principalmente). Estas son las fuerzas que se deben vencer para que se produzca un cambio químico. Son estas fuerzas, por tanto, las que determinan las propiedades químicas de las sustancias.
Sin embargo existen otras fuerzas intermoleculares que actúan sobre distintas moléculas o iones y que hacen que éstos se atraigan o se repelan. Estas fuerzas son las que determinan las propiedades físicas de las sustancias como, por ejemplo, el estado de agregación, el punto de fusión y de ebullición, la solubilidad, la tensión superficial, la densidad, etc.
Combustion of 28.0 g of gasoline releases 322 kcal of thermal energy. How many kilojoules of energy are released?
In the combustion of 28.0 g of gasoline, 1348.1 kilojoules of energy are released.
To find the energy released, we need to convert the energy in kilocalories to kilojoules.
We need to remember that:
1 cal = 4.1868 J (joules)1 kcal = 1000 cal1 kJ = 1000 JHence, the energy in kJ is:
[tex] E = 322 \:kcal*\frac{4.1868 \:J}{1 \:cal}*\frac{1000 \:cal}{1 \:kcal}*\frac{1 \:kJ}{1000 \:J} = 1348.1 \:kJ [/tex]
Therefore, 1348.1 kilojoules of energy are released.
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many substance are compound what is a compound
Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.
Answer:
A compound is a unique substance that consists of two or more elements combined in fixed proportions.
Explanation:
okkk
Chemical contamination is more likely to
occur under which of the following
situations?
When cleaning products are not stored properly
When dishes are sanitized with a chlorine
solution
When raw poultry is stored above a ready-to-eat
food
When vegetables are prepared on a cutting
board that has not been sanitized
Chemical contamination is likely to occur when cleaning products are not stored properly.
Chemical contamination refers to the introduction of harmful chemicals into food, water or the environment. These chemical substances may come in contact with food and water in many ways.
The most common sources of chemical contamination are chemical substances that are not properly stored.
Hence, chemical contamination is likely to occur when cleaning products are not stored properly.
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Which of the following is the smallest number?
100
1
.0035
.0000000000000000000003
Answer:
.0000000000000000000003
Explanation:
An image of Earth's layer is above.
Which layer is the most dense?
layer A
layer B
layer C
layer D
Answer:
d
Explanation:
il answer in comments if you brainly me
Liquid octane CH3(CH2)6CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 3.43 g of octane is mixed with 7.0 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.
Answer:
88 gram is the answer in 2 significant digits
One mole of octane gives 9 moles of water. Then, 3.43 g or 0.03 moles of octane will give 0.27 moles of water that is 4.86 g of water can be produced.
What is combustion reaction ?Combustion is a type of chemical reaction in which a gas reacts with oxygen to give carbon dioxide and water.
The combustion reaction of octane is given as follows:
[tex]\rm C_{8}H_{18} + \frac{25}{2}O_{2} \rightarrow 8CO_{2} + 9 H_{2}O[/tex]
As per this balanced chemical equation, one mole or 114 g of octane gives 9 moles of water.
no.of moles in 3.4 g of octane = 3.4 g/114 g = 0.03 moles.
no.of moles of water produced from 0.03 moles of octane :
= (0.03 × 9) = 0.27 moles.
Molar mass of water = 18 g/mol
then, mass of 0.27 moles = 0.27 × 18 =4.86 g.
Therefore, the maximum mass of water that could be produced here is 4.86 g.
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3. Which statements are true based on the Bohr model of the atom? Select all that
apply.
encore
a. Atomic emission spectra are due to electrons losing energy and changing
energy levels
b. The energy of transition for n=3 to n=4 would be the same as n=5 to n=6
c. The first energy level is set at zero energy
d. Electrons lose energy as they travel around the nucleus
e. Each energy level has a specific energy value
The model of Neils Bohr postulates that electrons in atoms are found in specific energy levels. Transition from a higher to a lower energy level produces an emission spectrum characteristic of elements.
According to Bohr's model of the atom, an electron in atom exists in distinct energy levels. Electrons can be promoted from lower to higher energy levels when they absorb energy. The electrons are unstable in this higher energy excited state hence they quickly return to the ground state emitting energy. This emission is characteristic of elements.
The following statements are true based on the Bohr model;
Atomic emission spectra are due to electrons losing energy and changing energy levels.Each energy level has a specific energy valueLearn more: https://brainly.com/question/24556237
Earth's lithosphere floats on a hot, plastic layer which allows plate movement. What is this layer called?
crust
asthenosphere
atmosphere
core
Answer:
atmoshpere
Explanation:
il explain in comment if you brainly me