Which of the following statements correctly describes the characteristics of the surface features in Column A and Column B?
The surface features in column A are formed by constructive forces while the surface features in column B are formed by destructive forces.
The surface features in column A are formed by destructive forces while the surface features in column B are formed by constructive forces.
The surface features in column A are formed by long-term processes while the surface features in column B are formed by short-term processes.
The surface features in column A are formed by short-term processes while the surface features in column B are formed by long-term processes.
Answer:
The surface features in column A are formed by long term processes while the surface features in columns B are formed by short term processes
La solución salina contiene 0.900 gramos de NaCℓ, masa molar = 58.5g / mol, en 100 ml de solución acuosa. La concentración salina, expresada en mol / L, es igual a:
Answer:
0.154 mol/L
Explanation:
Asumamos que tenemos 100 mL de solución, de ser así tendríamos 0.900 g de NaCl. Ahora hay que convertir 0.900 g de NaCl en moles, usando su masa molar:
0.900 g ÷ 58.5 g/mol = 0.0154 molCon el número de moles y el volumen (en litros), se procede a calcular la concentración en mol/L:
100 mL ⇒ 100 / 1000 = 0.100 LConcentración = 0.0154 mol / 0.100 L = 0.154 mol/LWhere does photosynthesis start?
Answer:
Have a nice day :)
Explanation:
the chloroplast
Photosynthesis occurs in the chloroplast, an organelle specific to plant cells. The light reactions of photosynthesis occur in the thylakoid membranes of the chloroplast. Electron carrier molecules are arranged in electron transport chains that produce ATP and NADPH, which temporarily store chemical energy.
URGENT I NEED YOUR HELP!!!
Which statement is true for a solution when its concentration of hydroxide ions becomes equal to the concentration of hydronium ions? (5 points)
It becomes more acidic.
It becomes more alkaline.
Its pH becomes equal to 0.
Its pH becomes equal to 7.
Answer:
Its pH becomes equal to 7.
Explanation:
When concentration of hydroxide ions becomes equal to the concentration of hydronium ions its pH becomes equal to 7.
Hence, Option (D) is correct answer.
What is pH ?pH is used to determine the whether the given substance is acidic, basic or neutral. The range of the pH is from 0 - 14. If pH is less than 7 then the solution is acidic, if the pH is equal to 7 then the solution is neutral, if the pH is greater than 7 then the solution is basic.
How to check it is acidic, basic, neutral in aqueous solution ?If the concentration of hydroxide ions and concentration of hydronium ion are equal then the solution is neutral that means the pH of the solution is equal to 7. If the concentration of hydronium ion is greater than hydroxide ion that is [H₃O⁺] > [OH⁻] then the solution is acidic that means the pH of the solution is less than 7. If the concentration of hydroxide ion is greater than hydronium ion that is [H₃O⁺] < [OH⁻] then the solution is basic that means the pH of the solution is greater than 7.When concentration of hydroxide ions becomes equal to the concentration of hydronium ions then the solution is neutral and the pH of the solution is equal to 7.
Thus, from the above conclusion we can say that Its pH becomes equal to 7 is the true statement for a solution when its concentration of hydroxide ions becomes equal to the concentration of hydronium ions.
Hence, option (D) is correct answer.
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The period of development from fertilized egg to birth is known as
The period of development from fertilized egg to birth is known as [tex]{ \bf{ \underbrace{prenatal\: development}}}[/tex].
[tex]\bold{ \green{ \star{ \orange{Mystique35}}}}⋆[/tex]
You are reacting hydrogen gas with tin oxide to purify tin. SnO2 + 2 H2 → Sn + 2 H2O. You have 45.8L of H2 gas and 351.3g of SnO2. What will be the limiting reactant, and how much of the excess reactant will be left over?
Answer: The limiting reactant is hydrogen gas and the mass of excess reactant [tex](SnO_2)[/tex] left over is 197.43 g
Explanation:
Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.
Excess reagent is defined as the reagent which is left behind after the completion of the reaction.
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
......(1)
We are given:
Given mass of [tex]SnO_2[/tex] = 351.3 g
Molar mass of [tex]SnO_2[/tex] = 150.71 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of }SnO_2=\frac{351.3g}{150.71g/mol}=2.33mol[/tex]
At STP conditions:
22.4 L of volume is occupied by 1 mole of a gas
Applying unitary method:
45.8 L of volume will be occupied by = [tex]\frac{1mol}{22.4L}\times 45.8L=2.04mol[/tex] of hydrogen gas
For the given chemical reaction:
[tex]SnO_2+2H_2\rightarrow Sn+2H_2O[/tex]
By stoichiometry of the reaction:
If 2 moles of hydrogen gas reacts with 1 mole of [tex]SnO_2[/tex]
So, 2.04 moles of hydrogen gas will react with = [tex]\frac{1}{2}\times 2.04=1.02mol[/tex] of [tex]SnO_2[/tex]
As the given amount of [tex]SnO_2[/tex] is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Thus, hydrogen gas is considered a limiting reagent because it limits the formation of the product.
Moles of excess reactant ([tex]SnO_2[/tex]) left = [2.33 - 1.02] = 1.31 moles
We know, molar mass of [tex]SnO_2[/tex] = 150.71 g/mol
Putting values in equation 1, we get:
[tex]\text{Mass of }SnO_2=(1.31mol\times 150.71g/mol)=197.43g[/tex]
Hence, the limiting reactant is hydrogen gas and the mass of excess reactant [tex](SnO_2)[/tex] left over is 197.43 g
What does it mean for something to be radioactive?
A. It has an emission spectrum.
B. It is in a stable condition.
C. It generates radio waves.
D. Its nuclei can split apart.
Answer:
D
Explanation:
Radioactivity means
the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei
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Ayudaaa. ¿Cuál es el punto de ebullición del agua en grados Celsius?
The question is: Help. What is the boiling point of water in degrees Celsius?
Answer: The boiling point of water in degrees Celsius is [tex]100^{o}C[/tex].
Explanation:
The temperature at which vapor pressure of a liquid becomes equal to the atmospheric pressure is called boiling point.
For example, the boiling point of water is [tex]100^{o}C[/tex].
This means that at [tex]100^{o}C[/tex] the molecules of water are having an equilibrium between liquid and vapor state of theirs.
Thus, we can conclude that the boiling point of water in degrees Celsius is [tex]100^{o}C[/tex].
what is the weight in grams of 1 mole of ammonium sulfate (NH4)2SO4
Answer:
The molar mass of one molecule of ammonium sulfate (NH4)2 SO4 132.14 grams per mole
Answer: 132.15 g
Explanation:
If this question is from a mastery test on Edmentum, I just took it and this was the correct answer
HELPPPPPP QUICK PLEASE (75 points)
What is the pH of a solution with a concentration of 4.2 × 10–5 M H3O+?
A. 2.31
B. 4.38
C. 5.62
D. 6.87
Answer:
i belive its c
Explanation:
How does adding heat energy affect magnesium fluoride (MgF2) molecules?
O A The motion of the molecules decreases.
o
B. The motion of the molecules increases.
O
C. The motion of the molecules is at a constant rate.
D. The motion of the molecules stops.
Answer:
Number B is Answer. The motion of the molecules increases
This mathematical model describes the changes that occur in a sample of water as its temperature increases. Based on this model, how do you expect the motion of the molecules in ice to compare with the motion of molecules in water vapor?
A. I expect the molecules in ice to move more quickly than the molecules in water vapor.
B. This model does not provide enough data to answer the question.
C. I expect the motion to be very similar.
D. I expect the molecules n water vapor to move more quickly than the molecules in ice.
Answer:
D
Explanation:
the motion of particles can move more quickly due to weak force of attraction. water vapour is a gas hence the answer
PLEASE ANSWER ASAP:!!!!What characteristics of water make it essential for life and a useful chemical in the formation of solutions?
Si se hace reaccionar CH3CH3 (etano) con cloro, en presencia de luz ultravioleta, los productos obtenidos en este paso son
Answer:
La reacción de etano, CH₃CH₃ y cloro, Cl₂ en presencia de luz solar se conoce como reacción de halogenación.
Los radicales de cloro se forman cuando el cloro se expone a la luz solar a continuación;
Cl₂ → 2Cl *
Se forma un radical etano cuando el etano, C₂H₆ reacciona con un radical libre de cloro, Cl *, como sigue;
C₂H₆ + Cl → C₂H₅ * + HCl
Se forma un producto halogenado cuando un radical libre de etano reacciona con una molécula de cloro como sigue;
C₂H₅ * + Cl₂ → C₂H₅Cl + Cl *
Un producto halogenado puede reaccionar además con un radical libre para producir como sigue;
C₂H₅Cl + Cl * → C₂H₅Cl₂
Explanation:
Which equation represents positron decay?
Answer: 4
Explanation:
I found it online
Which of the following elements will function as an cathode when it reacts with Mg?
1. Ba
2. Ag
3. Sr
4. K
Answer:
2. Ag
Explanation:
A cathode gains electrons therefore electrons are reduced. Silver (Ag) is a stronger oxidising agent than magnesium.
A sealed balloon filled with 5.00 liters of gas has a pressure of 1.49 atm. This balloon is taken under water where the pressure of the gas becomes 7.62
atm. What is the new volume of this gas? (Assume the temperature does not change.)
O 56.7L
0 0.978 L
0 1.02 L
O 2.27L
Answer:
0.978L
Explanation:
Using Boyle's law equation as follows;
P1V1 = P2V2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (L)
V2 = final volume (L)
According to the provided information,
P1 = 1.49 atm
V1 = 5.00 liters
P2 = 7.62 atm
V2 = ?
Using P1V1 = P2V2
1.49 × 5 = 7.62 × V2
7.45 = 7.62V2
V2 = 7.45/7.62
V2 = 0.978L
what are alpha particles??
Answer:
a helium nucleus emitted by some radioactive substances, originally regarded as a ray.
Explanation:
Answer:
They're charged particles Identical to the Helium Nucleus
Having 2 protons and 2neutrons and having a Mass of 4.
They're Heavy and slow(speed)In comparison to Beta particles and gamma rays
Usually Emitted from nucleus of radioactive nuclides during decay
PLEASE HELP THIS IS TIMED
Which of the following is a physical change?
CsF(s) + XeFo(s) → CsXeF;(s)
CO2 (s) + CO2(g)
O N2 (g) + 3H2 (g) → 2NH3 (g)
2H2 (g) + O2 (g) → 2H20 (1)
Zn(s) + 2 MnO2(s) + H20(1) → Zn(OH)2(s) + Mn2O3(s)
Please answer quickly!! 20 points!!9. Which represents the greatest mass of chlorine?
A) 1 mole of chlorine
B) 1 atom of chlorine
C) 1 gram of chlorine
D) 1 molecule of chlorine
Answer:
1 mole
Explanation:
if correct you may follow me for more helps
Among the given quantities, the greatest mass of chlorine is represented by one molecule of chlorine Cl₂ that is equal to 71 grams.
What is one molecules?A molecule of an element is formed by the combination of two atoms of that element. One mole of an element is the amount containing 6.022 × 10²³ atoms. This s number is called Avogadro number.
The mass of one mole of an element is called its atomic mass. Cl is 17th element. Atomic mass of Cl = 35.5 g
35.5 g of Cl is called one mole of Cl containing Avogadro number of atoms.
One molecule of Cl is represented as Cl₂ with the mass = 35.5 × 2 = 71 g.
This is the molecular mass of Cl.
One gram of Cl is small amount and mass of one atom of Cl is even smaller. Thus, one molecules of Cl represents the greater mass here. Hence, option D is correct.
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How is an endothermic reaction identified?
A. It has a large heat capacity.
B. It gives off heat as a product.
C. It requires heat as a reactant.
O D. It results in a phase change.
Answer:
Endothermic is identified if the process requires heat as a reactant, since endothermic means "intake of heat", so it has to take in some type of heat.
what are the chemicals used to preserve food and give it color and flavor
Answer:
Some of the chemicals used to preserve food and give it color are sodium nitrate, sodium benzoate, and propionate
Explanation:
Evolution can best be described as
A)
the change in size of body structures through use and disuse
B)
the formation of fossils
C)
a process of growth in an organism
D)
a process of change through time
PLEASE HELP!!!!
Which type of biological molecules often serve as enzymes that speed up chemical reactions?
Answer:
A fundamental task of protein is to act as enzymes-catalysts that increase the rate of virtually all the chemical reactions within cells. Although rnas are capable of catalyzing some reactions, most biological reactions are catalyzed by proteins
Glucose is one kind of sugar that we get from rice. How many elements does it contain? Use its chemical formula, C6H12O6
Answer:
Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms
Explanation:
Which substance would you expect to dissolve most rapidly in 100 mL water?
A
0.4 g granulated sugar
B
0.2 g powdered sugar
C
0.4 g powdered sugar
D
0.2 g sugar cube
Answer:
b because it is just 0.2 g and powdered sugar has more contact surface than granulated sugar or sugar cube
The solubility can be given as the amount of solute that can be dissolved in the 100 ml of the solution. The most rapidly dissolved sugar in water is 0.2 gram powdered sugar.
What is a contact surface?The contact surface can be given as the area of the compound that is in direct contact with the solution.
The solubility of the compound is found more in the solute with increased surface area.
The surface area of powdered sugar will be maximum, as more granules of the sugar will be in contact with the water than the cube or the granulated sugar.
Thus, the most rapid dissolution in water is found with 0.2 grams of powdered sugar. Thus, option B is correct.
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1. Which of the following combinations correctly represents the process of
photosynthesis?
a) Carbon Dioxide + Water + solar energy - Glucose + Oxygen
b) Carbon Dioxide + Water - Glucose + Oxygen + solar energy
c) Glucose + Oxygen Carbon Dioxide + Water + energy
d) Glucose + Oxygen + energy +
Carbon Dioxide + Water
Answer:
A
Explanation:
Answer:
I think It should be option A. It would have been B but, solar energy is not giving out, it's taken in
Find the mass of 3.21 x 10^-2 Nickel
Answer:
1.88 g
Explanation:
n(moles) = mass/molar mass
mass = moles x molar mass of nickel
mass = 3.21x10^-2 x 58.69
mass = 1.883949 grams
mass = 1.88 g (2dp)
Hope this helps :)
How did the first plants and animals arrive in Hawaii, before humans?
What is the equilibrium expression for the reaction below?
C(s) + O2(9)
2009)
[0][c]
O A.
[CO]
O B.
1
C с
OC.
[co]
[0][c]
CO2]
D.
Answer:
C
Explanation:
because it is product over reactants. hope this helps :)
The equilibrium expression for the reaction C(s) +[tex]O_{2}[/tex](g) ⇄ [tex]CO_{2}[/tex] (g) will be
[[tex]CO_{2}[/tex] ] / [ [tex]O_{2}[/tex] ].
What is equilibrium?Chemical equilibrium is a state where no net change in the quantities of reactants as well as products takes place during a reversible chemical reaction.
The given reaction is C(s) +[tex]O_{2}[/tex](g) ⇄ [tex]CO_{2}[/tex] (g) .
It is known that solid phase is not considered in equilibrium.
Hence, equilibrium expression = [[tex]CO_{2}[/tex] ] / [ [tex]O_{2}[/tex] ].
Therefore, the correct answer will be option (D).
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