Now that you have learned to balance equations using the models on the simulation. See if you can balance the(These are not found in the sim). Balance the reactions given

Answer: Glass is see through

Explanation:

Answer: Glass shaped into lens can bend light that passes through it

        -  Hyperopia (far-sightedness) : When the eye focuses light behind of the retina.

        - Myopia (near-sightedness): When the eye focuses light in front of the eye.

Answer:

Explanation:

Here, we want to get the hydrate formula

To get the hydrate formula, we need to get the number of molecules of water

Now, to get this, we have to divide the number of moles of water by the number of moles of the anhydrous solid

The number of moles of water is given as 0.75 while that of the anhydrous solid is 0.0243

Mathematically, we have it that:

The hydrate formula is thus:

The final pressure of 5.25L gas initially at 534 mmHg and 22 degrees celsius that is compressed to a final volume of 2.75 L is 1.31atm.

The combined gas law states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.

The pressure of a gas can be calculated by using the combined gas law equation as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

According to this question, a 5.25 L gas initially at 534 mmHg and 22 degrees celsius is compressed to a final volume of 2.75 L at a new temperature of 15 degrees celsius. The final pressure can be calculated as follows;

0.703 × 5.25/295 = P₂ × 2.75/288

0.0125 = 0.00955P

P₂ = 1.31atm

Therefore, 1.31 atm is the final pressure of the gas compressed to a lower volume of 2.75L.

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Each row is independent from the other, so we can use the same method for each one.

Le'ts give a variable for each column:

- S: Symbol

- z: Z (Atomic number)

- a: A (Mass number)

- p: No of Protons

- e: No of Electrons

- n: No of Neitrons

- c: Charge

In the symbol column, the right supercript is the charge, so since the Symbol is:

The charge is 2+. We write as 2+, but in math we would write as +2, they are the same, but in different notations.

The atomic number and the symbol are always unique, so each element has always the same atomic number and the other way around too.

From a periodic table, we can see which Element corresponds to which atomic number Z.

On a periodic table, we can see that the atomic number of Mg is 12, so:

Also, the atomic number and the number of protons is always the same:

The mass number, a, is alwais the number of protons plus the number of neutrons:

Since we know that the mass number is 25 in this case, we can calculate the number of protons:

So it checks out with the number on the table.

Each proton has a charge of 1+ and each electron has a charge of 1-. In Math terms, we can say that each proton counts as +1 and each electron counts as -1.

Thus, the charge is the number of protons minus the number o electrons:

Since the charge is 2+ and there are 12 protons, we can say:

So, there are 10 electrons.

Putting altogether, we have:

And, by the names:

Symbol: Mg²⁺

Z: 12

A: 25

No. of Protons: 12

No. of Electrons: 10

No. of Neutrons: 13

Charge: 2+

Answer

Explanation

N2O3(g) ⇌ NO(g) + NO2(g); ΔH is negative

The reaction is exothermic (ΔH is negative), an increase in the temperature will force the equilibrium to the left, causing the system to absorb heat and thus partially offset the rise in temperature.

Therefore, the correct answer is:

d. The equilibrium between the two forms of the gas is disturbed at high temperatures.

Answer

Explanation

If two molecules of mercury oxide decompose into 2 molecules of mercury and 1 molecule of oxygen gas, then the equation for the reaction is shown below

All questions where they ask you about concentration or volume of a solution prepared with another solution can be solved using the following equation:

Where C1 is the concentration of the first solution, V1 is the volume of the first solution, C2 is the concentration of the second solution and V2 is the volume of the second solution. You only need to be careful to use the rigth units.

This particular question ask for the Volume of the second solution, V2. Then we need to solve for V2 in the previous equation:

Answer:

let me know if this was helpful please.

The energy in Joules required to change 49.75 grams of liquid water from 95 Celsius to 105 Celsius is 2082.54J.

Energy is the ability to do work. The energy needed to heat a substance can be calculated using the following formula:

Q = mc∆T

Where;

According to this question, 49.75 grams of liquid water needs to be changed from 95 Celsius to 105 Celsius. The energy needed can be calculated as follows:

Q = 49.75 × 4.186 × (105 - 95)

Q = 2082.54J

Therefore, 2082.54J is the energy required to change the liquid water.

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Your system could not cool as effectively as it should due to refrigerant leakage. Your home cannot reach the target temperature due to your air conditioning system. However, it may also result in higher monthly energy costs.

Temperature is a unit used to represent hotness or coolness on any of a number of scales, including Celsius and Fahrenheit. According to temperature, heat energy will naturally move from a hotter (body with a high temp) to a colder (body with such a lower temperature) (one at a lower temperature)

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The ΔH°rxn for the reaction MgO(s) + CO2(g) à MgCO3(s) is -100. kJ mol-1.

What is enthalpy ?

Enthalpy is a property or state function that resembles energy; it has the same dimensions as energy and is therefore measured in joules or ergs. The value of enthalpy is solely dependent on the temperature, pressure, and composition of the system, not on its history.

Using ΔH° = ∑ΔfH°(products) – ∑ΔfH°(reactants), the enthalpy change is:

ΔH° = ΔfH°(MgCO3(s)) – [ΔfH°(MgO(s)) + ΔfH°(CO2(g))]

= (-1096 – [-394 -602]) kJ mol-1

= -100. kJ mol-1

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The reason why the Ionic and covalent bonds help arrange atoms into unique structures for proteins like hemoglobin is that the structure of a protein allows it to carry out its unique function.

The covalent bond is the kind of bond that exists between two atoms in which the electrons between the two atoms are shared. The electrons cloud of the bond lies between the two atoms. For the ionic bond, there is a transfer of the electrons from one atom to another. We ought to note that the transfer is  often from the metal to the non metal.

On the other hand, it should be noted that there are various kinds of bonding that are important to be able to keep the structure and the function of the protein. Aside from the covalent bonds that holds the atoms together, the ionic bonds could also be involved in the dipolar interactions that are responsible for the secondary structure of the protein.

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B. The structure of a protein allows it to carry out its unique function.

ur welcum

The first step we have to follow to answer this question is to convert the given mass to moles using CaCO3 molar mass:

Now, use the following formula to find the volume of water needed to prepare the solution:

It means that 0.29L are needed.

The plant made in one day 0.54 moles of oxygen.

From the balanced equation for photosynthesis, we know that 6 moles of oxygen are produced when 1 mole of glucose is produced at the same time.

So, to calculate the amount of oxygen that a plant made in one day when it produced 0.090 moles of glucose, we can use a mathematical Rule of Three:

Finally, the plant made in one day 0.54 moles of oxygen.

Answer

C) They're liquid solutions.

Explanation

An alloy is a mixture of metal with a second metal or other non-metal material. Airplanes, bicycles, and cooking pots are all usually made of different types of alloys. Examples of alloys include stainless steel, brass, bronze, brass, solder metal, pewter, and sterling silver.

Alloys can contain more than one metal so option A is not true.

Elements of an alloy do not combine through a chemical reaction. The mixing is generally done at a very high temperature where the elements and metals are melted, mixed, and left to cool; hence option B is not true.

Also, option D is not true because alloys are a mixture of metal with a second metal or other non-metal.

Hence, the best option is that all alloys are liquid solutions of metals and or other non-metals.

The correct answer is option C) They're liquid solutions.

Best describes how a filter can be used to sort materials is filters allow objects of a certain size to pass through, so if you know the size or size range of a certain component in a mixture, you can pass the entire mixture through a filter and sort out the component in that size range

Filtration can be defined as the mechanical or physical process used for the separation of one substance from another and such as solids, liquids, and gases, with the aid of an any medium and when the substances in a mixture have different particle sizes, they are separated by filtration and the mixture is poured through a sieve or filter and the smaller particles slip through the holes, but the larger particles do not

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A change in the substrate's oxidation state occurs during redox reactions. Oxidation is the process of losing electrons or increasing an element's oxidation state.

Gaining electrons or lowering the oxidation state of an element or its constituent atoms are both examples of reduction.

An oxidation-reduction (redox) reaction is a chemical process in which two compounds exchange electrons. Any chemical process in which a molecule, atom, or ion suffers a change in its oxidation number as a result of acquiring or losing an electron is known as an oxidation-reduction reaction.

An oxidizing agent is a substance that "accepts" or "receives" an electron from a reducing agent in a redox chemical process. Therefore, an oxidant is any chemical that oxidizes another substance.

An electron is "donated" to an electron acceptor by a chemical species known as a reducing agent. Chemicals that are often used as reducing agents include the Earth metals, formic acid, oxalic acid, and sulfite compounds.

Pb gets oxidized.

Manganese (Mn) gets reduced.

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When Boat A and Boat B have the same mass, the kinetic energy of Boat A is 9 times the kinetic energy of Boat B.

The energy that an object has because of its motion is called kinetic energy. We must apply a force to accelerate an object. Work is done  in applying a force. After work has been done and energy is transferred to the object, then the object will be move with a new constant speed.

Let' m' be the mass of both boats A and B.

It is given in the question that velocity of Boat A is three times greater than that of Boat B. Let the velocity of boat B be X, Kinetic energy of boat A be K₁  and kinetic energy of boat B be K₂

Kinetic energy of Boat A is:

K₁ = 1/2 * (mV₁)^2

  =1/2 * m *3X^2

   =9(1/2*m*X^2)

Kinetic energy of Boat B is:

K₂ = 1/2 *m *V₂^2

     =1/2* m* X^2

K₂ = 1/2*m*X^2

This implies that ,K₁  = 9* K₂

Kinetic energy of Boat A is 9 times the kinetic energy of Boat B.

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If the partition is removed and the gases mix adiabatically and completely, the change in entropy is equal to 263 K.

What is entropy?

The measure of a system's chaos is called entropy. It is an extensive property of a thermodynamic system, which means that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the letter S and is measured in joules per kelvin (JK%-1) or kg/m^2/s^-2K^-1. The entropy of a highly ordered system is low.

Lets assume nitrogen is an ideal gas with CV=5R/2

and assume argon is also an ideal gas with CV=3R/2

n₁=4 moles

n₂=2.5 moles

t₁ = 5°C,  in kelvin t₁= 5+273

t₁ = 278 K

t₂=1°C,  in kelvin t = 1+273

t₂= 273 K

u=пCVΔT

U(N₂)+U(Ar)=0

putting values:

4x(5R/2)x(T(final)-278) = 2.5x(3R/2)x(T(final)-273)

by simplifying:

T(final) = 263K

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96kPa. Option C is correct

According to Gay Lussac's law, the pressure of a given mass of gas is directly proportional to the temperature provided that the volume is constant. Mathematically:

Substituting the given parameters to determine the new pressure P2

Therefore the new pressure is 96kPa

Answer: 0.108

Explanation:

use v1s1 = v2s2

here v1 = 2.7ml s1 = 4 M v2 = 100ml s2=?

1) Convert milliseconds to seconds.

1 s = 1000 ms

72 ms is equal to 0.072 s.

Answer:

When electron jumps from lower energy orbit to higher energy orbit, energy is absorbed to make transition from lower energy orbit to higher energy orbit.

Explanation:

Since the reaction is 1:1, the limiting reactant is Zn and the excess reactant is S.

Mass in excess of S

So the answer is option b sulfur 0.407 g

a) The X is BaSO₄, b) The cation is Ag⁺ ions, c) another way to separate is by adding NaCl or NaSCN

It is given that the solution contains Ag⁺ and Ba²⁺ ions. In addition to Na₂SO₄, Ba²⁺ ions get precipitated to give BaSO₄ leaving the cation, Ag⁺.

The reaction would be,

Ag⁺ + Ba²⁺ ------Na₂SO₄---------> BaSO₄ + Ag+

Therefore,

a) The precipitate X that is formed would be BaSO₄ in the above scheme.

b) The cation that is left at Y is Ag⁺.

c) This reaction can also be carried out using NaCl and NaSCN. By using NaCl we could obtain, BaCl₂ and by using NaSCN we could get Ba(SCN)₂. Here both precipitates are soluble. The respective reactions are,

Ag⁺ + Ba²⁺ ------NaCl---------> BaCl₂ + Ag+

Ag⁺ + Ba²⁺ ------NaSCN---------> Ba(SCN)₂ + Ag+

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The correct descriptions of the terms in the periodic table are as follows:

The periodic table is the table that arranges the elements in order of increasing atomic number into vertical columns called groups and horizontal rows called periods.

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Explanation:

The question gives us the following reaction:

Pb(NO3)2 + 2 KI ---> PbI2 + 2KNO3

The equation tells us that 2 moles of potassium iodide (KI) produce 1 mole of lead(II) iodide (PbI2).

So:

2 moles KI ---- 1 mole PbI2

5 moles KI ---- x moles

x = 2.5 moles

Now let's transform 2.5 moles of PbI2 into grams:

m = n*MM

MM of PbI2 = 461 g/mol

m = 2.5*461 = 1,152.5 g

Answer: alternative "D" 1.15 x 10^3 g

In order to answer this question we will need the properly balanced reaction, which the question already gave us:

C5H12 + 8 O2 -> 5 CO2 + 6 H2O

Then we need to focus on the compounds that the question is asking, which are C5H12 and 5 CO2, from the reaction we can also identify the molar ratio between both molecules, 1:5, that means that for every mole of C5H12, we will end up with 5 moles of CO2

Now let's find out how many moles of C5H12 are in 25.5 grams of it, we will use its molar mass to find the answer, molar mass is 72.15 g/mol

72.15 g = 1 mol

25.5 g = x moles

x = 0.35 moles of C5H12

Now we have 0.35 moles of C5H12, we know that molar ratio is 1:5, now let's see how many moles of CO2 we will have

1 C5H12 = 5 CO2

0.35 C5H12 = x CO2

x = 1.75 moles of CO2

And now we will do a similar step using CO2 molar mass in order to find the final mass, molar mass for CO2 is 44.01 g/mol

44.01 g = 1 mol

x grams = 1.75 moles

x = 77.02 grams of CO2

The tasks would Power, Structural, and Technical Systems employees most likely perform are option B. package steaks, use laboratory equipment, and know the standards for food storage facilities.

A technological machine is fixed of interconnected components that have been designed to satisfy a selected characteristic without, in addition, human design input. Technological structures transform, store, transport, or manage substances, energy, and/or statistics for a particular cause.

Individuals who paint in the electricity, Structural, and Technical structures pathway observe an understanding of engineering, hydraulics, pneumatics, electronics, energy, systems, and controls in the field of agriculture. They design agricultural structures in addition to equipment and gadget.

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The analogy that best describes theories is that theories are like clay because they can be molded to fit changing opinions.

A theory is a thorough explanation of a scientific phenomenon that incorporates laws, hypotheses, and facts. For example, the gravitational field hypothesis explains why fruits fall from trees and astronauts float in space. A theory can be related to a clay as it can be moulded as per the observations. The more observations a theory anticipates, the more tests it passes, and the more facts it explains, the longer its core premises hold true.

A theory should be consistent with new data. If not, the theory is changed or abandoned. The more observations a theory anticipates, the more tests it passes, and the more facts it explains, the longer its core premises hold true.

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