Answer:1.59
Explanation: For every mol of Ca(OH)2 there are two moles of OH so the concentration of OH is .013 x2 =.026 M OH
pOH = - log [OH] so -log .026 = 1.59
pOH is the negative logarithm of hydroxide ion concentration. 1.59 is the pOH of a 0.013 M Ca(OH)₂ solution.
What do you mean by the term pOH?The term pOH is defined as the negative of the logarithm of the OH− ion concentration. It is represented by the formula pOH = - log [OH−].
pOH is the activity of acidity or alkalinity of a solution by determining the concentration of OH− ions.
If the pOH value is less than 7, the solution is basic. If the pOH value is equal to 7, the solution is neutral. If the pOH value is more than 7, the solution is acidic.
For every mol of Ca(OH)₂ there are two moles of hydroxide therefore, the concentration of OH is 0.013 x 2 = 0.026 M OH
According to the formula of pOH
pOH = - log [OH]
-log .026 = 1.59
Thus, the pOH of a 0.013 M Ca(OH)₂ solution is 1.59.
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Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid?
A) Both elements in the compound are metals.
B) The atomic masses of the elements in the compound are relatively small.
C) There is equal sharing of electrons between the atoms of the elements in the compound.
D) The electronegativity difference between the elements in the compound is relatively large.
Answer:
There is ionic bonding between Mg2+ ions and NO3− ions. Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid? Both elements in the compound are metals.
Answer:
The answer is D.
Explanation:
A: not correct: one element is a metal and the other is a non-metal.
B: not correct: Fr could be combined with Cl
C: not correct: They are transferred not shared.
D: correct: Non-metals have a higher electronegativity in comparison to the metals with a low electronegativity which results in a great change in electronegativity.
Is hydrogen the only non-metal positive ion?
Answer:
Why hydrogen is the only non-metal elements which loses electron to form positive ions ? ... When hydrogen bonded with most electronegative element then it forms a positive ions but when it bonded with less electronegative element then it forms a negative ion.
.How many moles of NaCl are in 28.0 g?
Answer:
0.48 mols
Explanation:
to convert moles to mass u need to divide mass by the molar mass of NaCl which is 58.44g/mols.
28g ÷ 58.44g/mol = 0.48 mols
PLS help its not that hard but I don't understand it. Its science not chemistry but they don't have science.
In this activity, you will construct two solar ovens and use thermometers to determine which oven gets the hottest. What engineering problem are you trying to solve?
Answer:
Conservation of resources. Saving energy and helping reduce carbon emission.
Explanation:
help me pleaseeeee #5
Answer:
Red
Explanation:
why are cells called the smallest functional unit of a living organism?
NO LINKS please help!
Answer:
True True False
Explanation:
Which of the following is best classified as a compound?
A. Oxygen, because it contains two of same
B. Carbon dioxide, because it contains two different types of atoms
Answer:
The answer is B
Explanation:
Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom. Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom.
Hope this helps!
What is the molarity of a solution containing 3.6 mol of KCl in 750 mL?
Answer:
[tex]\boxed {\boxed {\sf 4.8 \ M \ KCl}}[/tex]
Explanation:
The molarity of a solution is found by dividing the moles of solute by the liters. of solvent.
[tex]molarity=\frac{moles}{liters}[/tex]
We know the solution has 3.6 moles of potassium chlorine. We know there are 750 milliliters of solvent, but we need to convert this to liters.
1 liter is equal to 1000 milliliters. Set up a proportion.[tex]\frac {1 \ L }{1000 \ mL}[/tex]Multiply by 750 mL and the units of mL will cancel.[tex]750 \ mL * \frac {1 \ L }{1000 \ mL} = \frac {750 \ mL}{1000 \ mL}= 0.75 \ L[/tex]Now we know the moles and liters, so we can calculate molarity.
moles= 3.6 mol KCl liters= 0.75 LSubstitute these values into the formula.
[tex]molarity= \frac{3.6 \ mol \ KCl}{0.75 \ L}[/tex]
Divide.
[tex]molarity= 4.8 \ mol \ KCl/ L[/tex]
1 mole per liter is equal to 1 molar. Our answer of 4.8 moles of potassium chloride per liter is equal to 4.8 M KCl[tex]molarity= 4.8 \ M \ KCl[/tex]
The molarity of the solution is 4.8 M KCl.
balance this equation:
AsCl3(aq) +__H2S (aq)--> __As2S3(s) + ___HCl (aq)
Magnesium hydroxide is an ingredient in some antacids. Antacids react with excess hydrochloric acid in the stomach to relieve
indigestion.
a) balance the reaction that occurs between Mg(OH)2 and HCI.
(select choice) Mg(OH)2 + (select choice) HCI = (select choice) MgCl2 + (blank) H2O
b) what are the mole ratios that would be used to determine the number of moles of MgCl2 produced when HCl reacts with Mg(OH)2.
(blank) mol MgCl2/ (blank) mol Mg(OH)2
(blank) mol MgCl2/ (blank) mol HCI
Answer:
a. 2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O
b. 1 mol MgCl2/ 1 mol Mg(OH)2
1 mol MgCl2/ 2 mol HCI
Explanation:
a. The reaction of an acid (HCl) with a base (Mg(OH)2) produce water (H2O) and the salt (MgCl2):
_HCl + _Mg(OH)2 → _MgCl2 + _H2O
To balance the Cl:
2HCl + _Mg(OH)2 → _MgCl2 + _H2O
To balance the oxygen:
2HCl + _Mg(OH)2 → _MgCl2 + 2H2O
The reaction is now balanced
2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O
b. Based on the balanced reaction, the moles ratios are:
1 mol MgCl2/ 1 mol Mg(OH)2
1 mol MgCl2/ 2 mol HCI
Help with science!!!!
Answer:
the answe would be (c) temperate continental
Explanation:
How many moles are in 24.3g of iron (II) oxide?
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I need help with science pls help me :(!
A football is inflated to 12psi at 20°C What is the new pressure in the football
when the temperature is lowered to -5C
Answer: The new pressure is 3 psi.
Explanation:
Given: [tex]P_{1}[/tex] = 12 psi, [tex]T_{1} = 20^{o}C[/tex]
[tex]P_{2}[/tex] = ?, [tex]T_{2} = 5^{o}C[/tex]
Formula used is as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{12 psi}{20^{o}C} = \frac{P_{2}}{5^{o}C}\\P_{2} = \frac{12 psi \times 5^{o}C}{20^{o}C}\\= 3 psi[/tex]
Thus, we can conclude that the new pressure is 3 psi.
How many moles are in 100 grams of gold?
Answer:
0.01 mole
Explanation:
11. Write each step of uranium-240 undergoing first an alpha decay then two rounds of beta decay.
Pls HURRY HELPPP MEEEE
lanation:
ExpErnest Rutherford’s experiments involving the interaction of radiation with a magnetic or electric field (Figure 2) helped him determine that one type of radiation consisted of positively charged and relatively massive α particles; a second type was made up of negatively charged and much less massive β particles; and a third was uncharged electromagnetic waves, γ rays. We now know that α particles are high-energy helium nuclei, β particles are high-energy electrons, and γ radiation compose high-energy electromagnetic radiation. We classify different types of radioactive decay by the radiation produced.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
210
84
Po
⟶
4
2
He
+
206
82
Pb
or
210
84
Po
⟶
4
2
α
+
206
82
Pb
When [H+] = 3.33 x 10-7 what is the ph?
Answer:
6.48Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ {H}^{+} ])[/tex]
From the question we have
[tex]pH = - log(3.33 \times {10}^{ - 7} ) \\ = 6.477555...[/tex]
We have the final answer as
6.48Hope this helps you
7. What are the chemical formulas for water and calcium chloride?
Answer:
water: H2O
Calcium Chloride: CaCl2
water and calcium chloride: Ca(OH)2 + HCl
Explanation:
CaCl2 + H2O = Ca(OH)2 + HCl
Answer:
Water is H20
Calcium Chloride is CaCI2
How does the energy in chemical bonds affect the energy in a chemical reaction?
Answer:
Is by comparing the energy absorbed when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. Chemical reactions that release energy are called exothermic
Joel is studying a certain organ system of the human body. It interacts with the respiratory system to transport oxygen and carbon dioxide gases between the lungs and different parts of the body. It interacts with the digestive system to transport nutrients throughout the body, and it interacts with the urinary system to remove wastes from the body.
What is Joel studying?
A. the nervous system
B. the circulatory system
C. the skeletal system
D. the muscular system
A liquid changes color as it cools and becomes solid. How can you confirm
the type of change that took place?
A. Determining that the mass of the solid and liquid are different
would confirm that a chemical change took place.
B. Identifying the solid and liquid as the same substance would
confirm that a physical change took place.
O c. The color change and the formation of a solid confirm that a
chemical change took place.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Answer: Hello, There! your answer is Below.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Explanation:
The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.
Hope this helps you!!!
Have a great day!!!
When a liquid undergoes solidification and change of phase it is called freezing. The physical change can be confirmed by changes in the state of matter from liquid to solid. Thus, option D is correct.
What are physical changes?Physical changes are the modification in the matter or object that can be reversed back to its original state. They do not produce substances that are irreversible.
The change of the phase of the matter from liquid to solid when water substance undergoes freezing is a physical change as no new compound is created and the solidified substance can get converted back to liquid.
Therefore, option D. solid from liquid shows a physical change.
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Which types of wave are used to support the theory that galaxies are expanding
Visible Spectrum
Explanation:
which uses red shift to indicate objects making away while the blue shift indicates objects moving down.
Match each term with the appropriate definition.
spectroscopy
the study of the absorption and emission of
light by atoms
absorption spectrum
represents energy absorbed as dark bands
atomic spectrum
represents energy emitted or absorbed
during electron jumps
emission spectrum
represents energy emitted as colored lines
Answer:
Spectroscopy — the study of the absorption and emission of light by atoms
Absorption spectrum — represents energy absorbed as dark bands
Atomic spectrum — represents energy emitted or absorbed
during electron jumps
Emission spectrum — represents energy emitted as colored lines
Explanation:
Spectroscopy is an analytical technique to study and analyze using spectrum. It has been the absorption and emission of other light by the atoms. The correct matches are A.1, B. 2, C.3, and D.4.
What is spectroscopy?Spectroscopy is the technique used in chemistry where matter absorbs and emits radiations of a certain wavelength. The absorption spectrum is used to represent absorbed energy in the form of dark bands or lines. Thus, options A.1 and B.2 are correct.
The atomic spectrum is characterized by the black-colored bands that depict the energy absorbed and emitted by an excited atom during electron transitions. Whereas, the emission spectrum shows the colored lines that is the energy emitted when an electron transits from higher to lower energy levels. Thus, options C.3 and D.4 are correct.
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Help meeeeeeeeeeewweeee
Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.
Hope This Helps You ❤️El metal Mg reacciona con el Hcl para producir gas Hidrógeno Mg +2HCl---MgCl2 + H2. ¿Qué volumen en Litros de H2 en condiciones STP se liberan cuando reaccionan 8.25g de Mg? * 8.60L 6.60L 7.60L 16.60L
Answer: 7.60 L of hydrogen gas will be liberated.
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of Mg = 8.25 g
Molar mass of Mg = 24.305 g/mol
Plugging values in equation 1:
[tex]\text{Moles of Mg}=\frac{8.25g}{24.305g/mol}=0.340mol[/tex]
The given chemical equation follows:
[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]
By the stoichiometry of reaction:
If 1 mole of magnesium produces 1 mole of hydrogen gas
So, 0.340 moles of magnesium will be produce = [tex]\frac{1}{1}\times 0.340=0.340mol[/tex] of hydrogen gas
At STP conditions:
1 mole of a gas occupies 22.4 L of volume
So, 0.340 moles of hydrogen gas will occupy = [tex]\frac{22.4L}{1mol}\times 0.340mol=7.60L[/tex] of hydrogen gas
Hence, 7.60 L of hydrogen gas will be liberated.
A sample of a compound is added to distilled water in a clean beaker. A reaction occurs
and the water temperature drops rapidly. Which of the following statments best supports this
observation?
A. An endothermic reaction occurred
B. The water was originally warmer than the compound
C. An exothermic reaction occurred
D. The beaker was contaminated by another compound
Answer: An endothermic reaction occurred
Explanation:
A sample of a compound is added to distilled water in a clean beaker. A reaction occurs and the water temperature drops rapidly which indicates that an endothermic reaction occurred. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
An endothermic reaction means that heat is absorbed during this reaction (enthalpy change value has a positive sign).
During the endothermic reaction heat is absorbed from the surroundings (here, water) and hence the temperature of the water in which the reaction is taking place decreases.
Hence, option A is correct.
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Un elemento tiene 3 orbítales desapareados y presenta 3 niveles de
energía. ¿A qué grupo y período peretenece?
a) IIIA, 3 b) IIIB, 3 c) VIA, 3 d) VB, 3 e) VA, 3
What happens to wavelength as wave frequency increases?
Answer:
As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
Explanation:
I need y’all’s help please
Answer:
6 mass
Explanation:
because the si unit of gram is mass