Enter a chemical equation for Ca(OH ) 2 (aq) Ca(OH)2(aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely.

Answer: The charge on one electron is –1.6 x 10–19 coulomb.

Hope this helps!

An electron has a negative charge.

Answer:

78 moles of the solute

Explanation:

From the question;

We want to determine the number of moles needed

We need to know that;

Molarity = Number of moles ÷ Volume

Therefore;

Number of moles = Molarity × Volume

Hence;

Number of moles = 6.50 M × 12.0 L

                             = 78 moles

Thus, the moles of the solute needed is 78 moles

Answer:

The mass of liquid comes out to be 82 g.

Explanation:

Given density of liquid = 1.64 g/mL

Given volume of liquid = 50 mL

The relation between density and volume is shown below

[tex]\textrm{ Density} = \frac{\textrm{Mass of liquid}}{\textrm{ Volume of liquid}}[/tex]

Mass of liquid = [tex]1.64 \textrm{ g/mL}\times 50 \textrm{ mL} = 82 \textrm{ g}[/tex]

Mass of 50 mL liquid = 82 g

Answer:option d

Explanation:

Final answer:

The correct answer is 22.4L. At Standard Temperature and Pressure (STP), 1 mole of gas occupies 22.4 liters, allowing for the calculation of the total number of molecules in a given sample volume.

Explanation:

The correct answer is B) 22.4L. At STP (standard temperature and pressure), 1 mole of gas occupies 22.4 liters. Given that the question asks for the total number of molecules and not mass, we should consider the volume to calculate the number of molecules of argon. So, to contain 3.01 x 10^23 molecules, the sample should have a volume of 22.4 liters.

Explanation:

Minerals should be found in nature. Elements made laboratories are not actual minerals like masquerading as rubies or sapphires. All naturally available crystals are not minerals like opal and amber.

Minerals are not under any class of organic compounds. Almost all known minerals come from inorganic processes. Some minerals originate from organic processes like pearls.

Minerals exist only as solids. Solids have a defined volume and shape, and they cannot be compressed any further. Minerals are rigid.

Each mineral has a unique combination of atoms that cannot be found in other minerals. The strength of mineral can be defined by the type of bond a mineral has. Some minerals, like gold and diamond, have only one element in it.

Minerals form crystals that have repeated arrangements of ions. Minerals have different shapes depending on the size of the ion. Crystals usually take six types of shapes.

Final answer:

Metals have a crystalline lattice that allows free movement of delocalized electrons, making them conductive.

Explanation:

The element that has a crystalline lattice through which electrons flow freely is a metal. In a metallic crystal, metal cations are surrounded by a “sea” of mobile valence electrons, also known as delocalized electrons. These electrons can move through the entire crystal, conducting electricity effectively. This is because the metal ions (often visualized as positive ions due to their loss of valence electrons) are arranged in a lattice structure with enough space for the electrons to move. The free electrons are not tied to any single atom, which allows them to move freely among the atoms when an electrical field is applied. This property is what makes metals good conductors of electricity as opposed to ionic, covalent network, and molecular crystals, which have different electrical properties.

It is an example of a binary compound.

Answer:

V₂ = 18.13 L

Explanation:

Given data:

Mole of gas = 1 mol

Initial temperature = 273 K

Initial pressure = 1 atm

Final volume = ?

Final temperature = -41°C (-41+273 = 232 K)

Final pressure = 805 mmHg (805/760 = 1.05 atm)

Solution:

First of all we will calculate the initial volume of gas.

PV = nRT

V = nRT/P

V = 1 mol × 0.0821 mol.L/atm.K × 273 K / 1 atm

V = 22.4 L/atm / 1 atm

V = 22.4 L     ( initial volume)

Now we will determine the final volume by using equation,

P₁V₁/T₁ = P₂V₂/T₂

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Now we will put the values.

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 1 atm × 22.4 L ×  232 K / 273 K × 1.05 atm

V₂ = 5196.8 atm .L. K / 286.65 atm.K

V₂ = 18.13 L

Answer:

That makes Dimagnesium phosphate

Answer:

The reaction between Magnesium and Hydrogen Phosphate forms Magnesium Hydrogen Phosphate

Explanation:

When magnesium reacts with hydrogen phosphate it forms an ionic compound called Magnesium Hydrogen Phosphate or Dimagnesium Phosphate.

Magnesium Hydrogen Phosphate is an ionic compound with the formula HMgO4P.

Equation;

Mg + HPO4 ------> HMgO4P

Similarly we can use Magnesium Phosphate to demonstrate the reaction.

In chemistry, the sum of charges of the anion and the cation of any ionic compound is always equal to zero.

To determine the number of anion and cation required for the sum to be zero we simply use the criss-cross method. This involves taking the charge of one ion and making the absolute value of that charge to be the amount of the other ion.

Therefore, Magnesium having a charge of 2+; we will have two(2) Phosphate cations for it.

Also, Phosphate has a charge of 3-; so we have three(3) Magnesium cations.

Equation;

[tex]Mg^{2+} + (PO4)^{3-} ----> Mg3(PO4)2[/tex]

Answer:

Explanation:

An acid is a substance that interacts with water to produce excess hydroxonium ions in an aqueous solution.

An electrolyte is a compound which breaks up into ions when dissolved in water or when in molten form.

A strong acid is one that ionizes almost completely ion aqueous solution.

To make a strong electrolyte, there must be presence of ions from compounds that ionizes completely in aqueous solution or in molten form to give free mobile ions. This is why strong acids are very strong electrolytes too.

2. Other examples of strong electrolytes are mineral acids, caustic alkalis and salts because they also ionize completely in aqueous solutions. Any compoud that ionizes completely in aqueous solution will produce a strong electrolyte.

Strong acids are considered strong electrolytes because they completely ionize in solution, producing a high concentration of ions which makes them good conductors of electricity. However, not all strong electrolytes are strong acids; other substances like strong bases and salts can also be strong electrolytes.

Strong acids, such as hydrochloric acid (HCl), are also strong electrolytes because they ionize completely in aqueous solution, meaning they release all their hydrogen ions (H*). This leads to a high concentration of ions, making them excellent conductors of electricity, which is the characteristic of a strong electrolyte. These acids are more likely to donate H* and react with other substances in solution.

However, not every strong electrolyte is a strong acid. A strong electrolyte only indicates that a substance can fully dissociate into ions in solution, enhancing its ability to conduct electricity. Other substances, like strong bases and salts, can also be strong electrolytes. For example, sodium hydroxide (NaOH) is a strong base and a strong electrolyte because it readily dissociates into Na+ and OH- ions in solution.

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Answer:

B

Explanation:

Mutations that increase an organism's ability to survive and reproduce in its environment are more likely to be passed on to future generations. This core principle is known as survival of the fittest.

The concept of survival of the fittest is closely related to the idea of mutations. Mutations are changes in an organism's DNA that can lead to new traits. The best way to describe how mutations relate to survival of the fittest is to say that a mutation that allows an organism to survive and reproduce more successfully in its environment is more likely to be passed on to future generations.

Thus, option B is the correct answer: 'A mutation that allows organisms to survive is more likely to be passed on'. Not all mutations are beneficial, some can be harmful or neutral, but only those mutations that increase an organism's fitness — its ability to survive and reproduce — are likely to be passed on.

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Answer:

2.42L

Explanation:

Given parameters:

V₁  = 1.8L

T₁ = 293K

P₁  = 101.3kPa

P₂ = 67.6kPa

T₂  = 263K

Unknown:

V₂ = ?

Solution:

To solve this problem, we are going to use the combined gas law to find the final volume of the gas. The combined gas law expression combines the equation of Boyle's law, Charles's law and Avogadro's law;

               [tex]\frac{P_{1} V_{1} }{T_{1} } = \frac{P_{2} V_{2} }{T_{2} }[/tex]

All the units are in the appropriate form. We just substitute and solve for the unknown;

         101.3 x 1.8 / 293    =     67.6 x V₂  /  263

          V₂   = 2.42L

Answer:

When heat is added to a substance the molecules and atoms vibrate faster. As atoms vibrate faster the space between atoms increases. The motion spacing of the particles determines the state of matter of the substance. The end result of increased molecule emotion is that the object expands and takes up more space.

The advantage in using a simple machine is to reduce the amount of work needed to move on object

Option A

Explanation:

A Simple machine is a device with less moving parts used to change motion and force to perform work. Some of the simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw which we all use in our daily life.

These simple machines make our work fast and accurate and also does not require much effort for the work to be done. In other words, we can tell simple machines make our work simpler. For eg: If we take the simple machine wheel and axle, in a bicycle, instead of moving the whole wheel, if we apply force on the pedals, the wheel starts moving. Thus, only less effort is required to move an object.

Answer:

The second one is the CORRECT answer.

Explanation:

1) The mass of iron III oxide is 3.92 g and the mass of water is 1.32 g

2) The mass of the Mg is  19.44 g

3) The mass of calcium phosphate is 109 g

What is stoichiometry?

1) The equation is;

[tex]2Fe(OH)_3 - > Fe_2O_3 + 3H_2O[/tex]

Number of moles of iron III hydroxide

Moles = Mass/Molar mass

= 5.25 g/107 g/mol

= 0.049 moles

2 moles of iron III hydroxide produces 1 mole of iron III oxide

0.049 moles of iron III hydroxide produces 0.049 moles  * 1 mole/2 moles

=0.0245 moles

Mass iron III oxide = 0.0245 moles * 160 g/mol

= 3.92 g

2 moles of  of iron III hydroxide produces 3 moles of water

0.049 moles of iron III hydroxide produces 0.049 moles * 3 moles/ 2 moles

= 0.0735 moles

Mass of water = 0.0735 moles * 18 g/mol

= 1.32 g

2) Moles of magnesium fluoride = 50 g/62 g/mol

= 0.81 moles

[tex]Mg + F_2 -- > MgF_2[/tex]

1 mole of Mg produces 1 mole of magnesium fluoride

x moles of Mg produces 0.81 moles of magnesium fluoride

x = 1 * 0.81/1

= 0.81 moles of Mg

Mass of the Mg = 0.81 moles  * 24 g/mol

= 19.44 g

3) [tex]3CaO + P_2O_5 --- > Ca_3(PO_4)_2[/tex]

Moles of calcium oxide = 100 g/56 g/mol

= 1.79 moles

Moles of phosphorus pentaoxide = 100 g/284 g/mol

= 0.35 moles

If 3 moles of calcium oxide reacts with 1 mole of phosphorus pentaoxide

1.79 moles of calcium oxide reacts with  1.79 * 1/3

= 0.596 moles

Thus phosphorus pentaoxide is the limiting reactant

1 mole of phosphorus pentaoxide produces 1 mole of calcium phosphate

0.35 moles of phosphorus pentaoxide produces 0.35 moles of calcium phosphate

Mass of calcium phosphate produced = 0.35 moles * 310 g/mol

= 109 g

Answer:

All I can say is that it seems to go through the other layers. I would say this is an intrusive rock and probably the youngest

Explanation:

I suggest d i k e s. Put it together. somehow I cant post it when put together

Answer:

Layer L represents a fault line. It formed after layer E and all the layers beneath it. There is no displacement in layer G or layer A. Therefore, the fault line formed before these two layers.

Explanation:

this is the actual answer

Answer: Addition Property of Equality

Explanation:

The addition property of equality says that if we add same value or quantity on both sides of an equation, the values on both the sides remain equal. Consider an equality a = b. Addition property of equality is a + x = b + x. Add the same number to both the sides of an equation.

Answer:

1.01atm

Explanation:

760mmHg = 1atm

765mm Hg = 765/760 = 1.01atm

Therefore, the barometer reading in atmosphere is 1.01atm

Answer:

basic

Explanation:

A solution of copper (I)hydroxide is a base and it will form a basic solution no matter what.

A base is a compound the produces hydroxyl ions in aqueous solutions. Most known bases always have the OH⁻ group attached to them in a compound.

Copper(I) hydroxide is a an alkali as it can dissolve in water. It shares all the unique characteristics of a typical base and it will turn red litmus paper blue.

Answer:

3.6m/s

Explanation:

The following data were obtained from the question:

Frequency = 3Hz

Wavelength = 1.2m

Velocity =?

Velocity = wavelength x frequency

Velocity = 1.2 x 3

Velocity = 3.6m/s

Answer: The equilibrium constant for the given reaction is 1.33

Explanation:

We are given:

Equilibrium concentration of ammonia = 2 M

Equilibrium concentration of nitrogen gas = 3 M

Equilibrium concentration of hydrogen gas = 1 M

For the given chemical equation:

[tex]N_2+3H_2\rightleftharpoons 2NH_3[/tex]

The expression of [tex]K_{eq}[/tex] for above equation follows:

[tex]K_{eq}=\frac{[NH_3]^2}{[N_2][H_3]^3}[/tex]

Putting values in above equation, we get:

[tex]K_{eq}=\frac{(2)^2}{3\times (1)^3}\\\\K_{eq}=1.33[/tex]

Hence, the equilibrium constant for the given reaction is 1.33

Answer:

Option D. The total amount of both matter and energy does not change.

Explanation:

From Law of conservation of energy and Einstein's mass-energy relation, we know that, energy neither is formed not is destroyed. It converts from one form to another. Einstein's mass-energy relation: E = mc². It means, Matter is a form of energy i.e. matter holds energy equivalent to product of its mass and square of speed of light. Matter and energy can change forms but the total amount does not change in a closed system. Thus, correct option is D.

Answer:

D. energy cannot be created or destroyed, therefor, the total amount of matter and energy does not change.

Explanation:

study island

Answer: The first one would be "_______ mechanical energy" second one is "gravitational potential energy"

Sorry; I have no idea at all what word would be placed in front of mechanical the only word that comes to mind is Kinetic but I think it may be wrong

Final answer:

Kinetic energy is the form of energy found in large moving objects. It is the energy of motion, allowing objects to perform work when they are in motion, and is calculated based on the object's mass and velocity.

Explanation:

The form of energy that is found in large moving objects is kinetic energy. Kinetic energy is the energy of motion, allowing objects to perform work when they are in motion. A few everyday examples of kinetic energy include a speeding bullet, a person walking, and the molecules in the air that move rapidly to produce heat. Anything that moves has kinetic energy, and the amount of kinetic energy an object possesses depends on both its mass and its velocity, as expressed by the formula KE = 1/2mv², where m is mass and v is velocity.

While kinetic energy is associated with motion, potential energy is energy that is stored. For instance, a wrecking ball held at a height has potential energy due to its position but when it's moving, that potential energy is converted to kinetic energy, highlighting energy transformation between the two forms.

Answer:

a. 2.7 mol of water

b CH2.

c. O2

Explanation:

The complete equation of the reaction should be:

2CH2(g) + 3O2(g) → 2 CO2(g) + 2 H2O(g)

a) how many moles of water will be  made?

To make 2 molecules of water (H2O) we need 2 molecules of CH and 3 molecules of O2.

We have 2.7 mol of CH2, the possible yield of water produced if it all used up will be:

2.7 mol * 2/2= 2.7 mol

We have 6.3 mol of O2, the possible yield of water produced  if it all used up will be:

6.3 mol * 2/3 = 4.2 mol

Since the maximum yield of CH2 lower, we can have 2.7 mol of water and have some excess oxygen at the end of the reaction.

b) What is the limiting reactant?

A limiting reactant is a reactant that will be used up in the reaction. This reactant has the lowest stoichiometric ratio compared to other reactants, which make them the one depleted out first. Since they depleted, the reaction will stop. Thus they limit the number of reactions and called limiting reactants. If you add the limiting reactant, the reaction will continue.

The limiting reactant in this reaction is the CH2. When producing water molecules, all 2.7 mol of CH2 will be used while we still have O2 left.

c) What is the excess reactant?

The excess reactant will have some remains after the reaction stop. That is because the excess reactant has more mass than needed for the reaction that will use all limiting reactants. Since we still have remains, adding excess reactant won't continue the reaction.

The excess reactant in this question is O2 since it still has remained after we make 2.7 mol of water. The O2 remaining, in this case, will be:

6.3 mol - 2.7mol * 3/2= 2.25 moles

Answer:

313, 6grams of H3PO4

Explanation:

We calculate the weight of 1 mol of H3PO4:

Weight 1 mol H3PO4= (Weight H)x3+ (Weight P)+(Weight 0)x4  =1gx3+31g+16gx4

Weight 1 mol H3PO4=98 g /mol

1 mol-----98 grams H3PO4

3,2mol----x= (3,2molx 98 grams H3PO4)/ 1mol=313,6 grams H3PO4

Answer:

  Ocean water taken from the surface of the ocean

Explanation:

Attached is a plot of ocean salinity vs. depth. It shows the highest salinity ocean water is surface water. A world-wide map of ocean salinity shows the highest salinity to be in mid-latitude regions in the middle of the ocean. Water near the North Pole has lower salinity than that for lower latitudes.

Probably the main reason for higher salinity at the surface is the high evaporation rate of water there, leaving behind the salt.

Answer:

chemical process

Explanation:

B. An upwelling of magma from the mantle gathers close to the Earth’s surface

Hot spots, according to the mantle plume theory, are triggered by an upwelling of magma from the mantle that builds up near the Earth's surface. The magma is the result of extreme interior heat melting mantle material, which ascends and pierces the crust to form a hotspot.

According to the mantle plume theory, hot spots are caused by an upwelling of magma from the mantle that gathers near the Earth’s surface. This magma is generated by the intense heat in the Earth's interior (the core), which causes material in the mantle to melt. When this molten material rises upwards, it can punch a hole in the crust and form a hotspot. Thus, the correct answer to your question is B: an upwelling of magma from the mantle gathers close to the Earth’s surface.

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Answer:

32km/hr

Explanation:

The question asks to calculate the average speed for a boat.

Mathematically, the average speed is the total distance divided by the total time

Let’s get the total distance traveled:

That would be 70km + 26km = 96km

Now the total time taken would be 3 as the boat did not move at all for an hour.

The average speed is thus 96/3 = 32km/hr

Answer:OK. One of the properties of an ionic compound is that it conducts a current in aqueous (water) solution.

The ionic compound is held together by virtue of the opposing charges; plus and minus. In water, they may just crumble away into solution! But if you Heat a solid piece of a salt, an ionic compound, it takes a great deal of Energy! So look at Compound Y.

WOW! 455°C to melt. That is high. To boil it? 1550°C. That is very high! Especially compared to compound X!

It melts at -90°C, and boils at 82°C. So it is X that is your molecular compound, one of covalent bonding, or sharing electrons, VERY different than the ionic compound held together by opposing charges.

Explanation:

Ionic compounds consist of ions held together by electrostatic attraction, while molecular compounds are formed by the sharing of electrons between nonmetal atoms.

An ionic compound consists of ions held together by electrostatic attraction, while a molecular compound consists of molecules held together by covalent bonds. Ionic compounds typically consist of a metal cation and a nonmetal anion, such as NaCl (sodium chloride). Molecular compounds, on the other hand, are formed by the sharing of electrons between two or more nonmetal atoms, such as H2O (water).

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