At 30°F and atmospheric pressure, water?
A. sublimes. B. melts. C. freezes. D. deposits. E. boils.

Answer:

7.06 x 10⁴ J

Explanation:

To find the amount of heat necessary to heat the water, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = heat (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = change in temperature

The specific heat capacity of water is 4.186 J/g°C. You can plug the given values into the equation and simplify to find "Q".

Q = ? J                              c = 4.186 J/g°C

m = 225 g                        ΔT = 100.0°C - 25.0°C = 75.0°C

Q = mcΔT                                                  <----- Given equation

Q = (225 g)(4.186 J/g°C)(75.0°C)              <----- Insert values

Q = 7.06 x 10⁴ J                                        <----- Multiply

The three rules for writing net ionic equations are actually quite simple. Consider only breaking up the (aq) substances. Only strong electrolytes should be broken up. Any ions that appear on both sides of the equation should be removed.

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1. The behavior of submicroscopic particles can sometimes be described as waves - True

2. Quantum mechanics limits us to making statistical statements about the location of an electron in an atom - True

3. The uncertainty principle is important only for particles of very small mass, such as the electron - True

Quantum mechanics is the branch of science that deals with the particles that we have in the atom. The study of quantum mechanics led us to appreciate the position of the electrons that are found in the atom.

The spear head of the study of quantum approach to the atom was Erwin Schrodinger when he proposed the wave mechanical model of the atom.

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Answer: ionic bond

Explanation:

Answer:

About 0.479 moles

Explanation:

The heat made by a mixture of gases is less than that produced by solitary gases of hydrogen or oxygen.

The property becomes a solution of a homogeneous mixture. Some of the effects of gas mixtures are easy to control. if we know the composition of the gases in the mix. In gas mixtures, all components in the gas phase can be used separately. The atmosphere is a mixture of different gases. The part, usually present in solution, first has to be atomized in a flame. Premixed combustion flame, a mixture of fuel and oxidant gas, and diffusion. compared to liquid streams, is relatively simple because the bulk characterization of a single phase is implicit. However, when gas. The heat produced by a mixture of gases is less than that produced by solitary gases. of hydrogen or oxygen.

so we can conclude that the flame appears yellow if there are impurities in the air whereas a pure hydrogen gas flame will not produce any smoke.

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Answer:

1. Fe: 26, 26, 30

2. Rh: 45, 45, 58

3. Sr: 38, 38, 50

4. Li: 3, 3, 4

5. Bi: 83, 83, 126

Explanation:

Protons = electrons = atomic number

Atomic mass - atomic number = neutron

The area of this flag in square centimeters is 10.58 × [tex]10^{7} cm^{2}[/tex].

The quantity of unit squares that fit inside a shape determines its area. A unit square is a square having a side of one unit, as "unit" here denotes one (1). The total number of unit squares that are contained within a rectangle's perimeter is hence its area. Or, you can refer to the area of the rectangle as the region included within the rectangle's envelope. The rectangular tiles that make up your home are a fantastic illustration of form. The number of tiles on the floor makes it simple to calculate how much area it takes up. You may calculate the rectangle's area using this as well. A number of unit squares equal the area of a rectangle.

Area of flag = area of a rectangle

= l × b

=  1.26 × [tex]10^{4}[/tex]   ×   8.40 ×[tex]10^{3}[/tex]

= 10.58 × [tex]10^{7}[/tex] [tex]cm^{2}[/tex]

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Answer:

Can't decide, Can't decide, and mixture.
Hopefully this is right. Technically you also can't decide on C but the chances of it being a pure substance are very low.

Explanation:

Technically, you can't decide on any of them since you have no idea of the actual compositions. Even if the ratio of the elements in grams are the same, there is no guarantee that the elements are chemically combined. For example, if you are given the info that a box contains 1 gram of hydrogen and 8 grams of oxygen, it could contain 9 grams of water, or 1 gram of hydrogen gas and 8 grams of oxygen gas. Knowing that water contains 1 gram of hydrogen and 8 grams of oxygen per 9 grams of oxygen doesn't help you determine if a container with 2 grams of hydrogen and 8 grams of oxygen has hydrogen peroxide or just a mix of the two gasses.
For A, it could be a pure substance since the ratio of E1 to E2 is twice the ratio of E1 to E2 in substance X. You can't really decide though
For B, it could be a pure substance since the ratio of E1 to E2 is four times the ratio of E1 to E2 in substance X. You can't really decide though
For C, It is very likely to be a mixture, since the ratio of E1 to E2 in substance C is 2.7 times that of the ratio of E1 to E2 in substance X

The molarity of the 20 mL H₂SO₄ solution required for the titration is 0.0388 M

We can obtain the molarity of the H₂SO₄ solution by doing the following:

H₂SO₄ + 2LiOH —> Li₂SO₄ + 2H₂O

The mole ratio of the acid and base obtained from the equation is:

From the question given, we obtained the following:

MaVa / MbVb = nA / nB

(Ma × 20) / (0.1 × 15.5) = 1 / 2

(Ma × 20) / 1.55 = 1 / 2

Cross multiply

Ma × 20 × 2 = 1.55

Ma × 40 = 1.55

Divide both side by 40

Ma = 1.55 / 40

Ma = 0.0388 M

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The different types of neon with varied numbers of neutrons are best referred to as isotopes.

In chemistry, isotopes are atoms of the same elements. These atoms have the same number of protons in their nuclei. Thus, they have the same atomic number.

However, isotopes of the same elements do not have the same number of neutrons in their nuclei. Thus, isotopes have the same number of protons but different mass numbers because of the difference in the number of neutrons.

Now consider different neon atoms with 10, 11, and 12 neutrons. These atoms are best described as isotopes of neon.

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Answer:

wetting and drying

cultivation

freezing and thawing

particle size

Earthworm

The mass of the peanut butter that you took out of the container is 34.1 ounces

The conversion factor is the manner in which we are able to change a value from one unit to another, Let us recall that there could be several units that could be used for a particular calculation and many times it is necessary to convert a value from one of the units to another for ease of calculation.

Mass of the crunchy butter =  1.26 kg

Percent used = 7.7%

Mass of the  crunchy butter used =  7.7/100 * 1.26 kg = 0.97 Kg

To convert to ounces;

0.97 Kg * 35.247 ounces/1 Kg

= 34.1 ounces

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Answer:

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

The mass of water  produced in the oxidation reaction is 2.5 g.

Oxidation reaction of ethanol occurs when ethanol comes in contact with oxygen, producing water and acetic acid. This type of reaction can also produce carbon dioxide and water.

The oxidation reaction of ethanol and oxygen is given as;

CH₃CH₂OH  + O₂  -----------> H₂O  +  CH₃COOH

Molecular mass of ethanol;

CH₃CH₂OH = (12) + (3 x 1) + (12) + (2 x 1) + (16) + (1) = 46 g/mol

Molecular mass of water;

H₂O  = (2 x 1) + (16) = 18 g/mol

From the reaction above, we can infer the following;

46 g of ethanol ---------> 18 g of water

6.5 g of ethanol ---------?

= (6.5 x 18) / 46

= 2.54 g of water

Thus, the mass of water that is produced by the reaction of 6.5g of ethanol is 2.5 g.

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Electron configuration notation describes an atom in an excited state as [Ar]4s²3d84p¹. Option D.

An electron is in an excited state when it temporarily occupies a higher energy state than its ground state. Electrons are excited when additional energy is supplied. When it absorbs a photon or packet of light or collides with a nearby atom or particle.

When an electron absorbs energy and shifts from a lower energy orbital to a higher energy atomic orbital the atom assumes an exciting electronic configuration. Usually an unstable electronic configuration. As a result, the electron returns to the ground state and releases a certain amount of energy. Ground state means the state with the lowest energy. When an electron absorbs energy and pops into an outer orbit, this state is called an excited state.

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The value of the difference of 147.6 mm and 0.82 mm is equal to 146.78 in units of mm.

Scientific notation is a method of expressing numbers that are too large or too small to be conveniently written in decimal form. The scientific notation may be referred to as standard index form or scientific form.

This base ten notation is generally used by mathematicians, scientists,  and engineers. The scientific notation of nonzero numbers can be written in the form [tex]m \times10^n[/tex] or 'm' times 10 raised to the power of n, where n is an integer.

To calculate the difference of 147.6 mm and 0.82 mm:

147.6mm − 0.82mm = 146.78 in the units of mm

As we know one millimeter is equal to 10⁻³ meters. As mentioned in the question, keep the unit 'mm' which is a millimeter.

Therefore, 147.6mm − 0.82mm = 146.78 in units of mm.

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The balanced equation is

4 KO2(s) + 2 CO2(g) = 2 K2CO3(s) + 3 O2(g).

The law of conservation of mass states that the mass of the reactants and products of a chemical reaction should be equal. The amount of atoms for each element doesn't really increase as a consequence of the chemical reaction. Thus, the chemical equation illustrating the chemical process must be balanced. A chemical equation is said to be balanced when the number of atoms involved on the reactants and products sides are equal.

Here are the steps we need to do in order to balance an equation:

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Polar  molecule : [tex]NH_{3} , HF, H_{2}O, CH_{3}F.[/tex]

Non Polar Molecules : [tex]CH_{4}, BeCl_2[/tex]

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Answer: N2O4

Explanation:

N2H4  molecular weight is 32   150g/32 = 4.7 mol

N2O4 Molecular weight is 92  200/92 = 2.2 mol

So the N2O4 has less moles present and will be the limiting reactant.

Answer:

0.04 mole or 1.23 g

Explanation:

1 mole of P has 6.02 x 10^23 atoms

so quantity in moles of P of 2.40 x 10^22 atoms equal

1 mole x (2.40 x 10^22)/(6.02 x 10^23)

= 0.03986710963 or 0.04 mole

1 mole of P = 6.02 x 10^23 atoms = 30.97 g

2.40 x 10^22 atoms weights

(30.97)(2.40 x 10^22)/(6.02 x 10^23)

= 1.23468438538 or 1.23 g

My ability to interconnect my understanding in biology, chemistry and homeostasis makes me a great scientist as I will apply all these in my future career by:

These are the hormones which are released when we suddenly find ourselves in a dangerous or life threatening situation such as we need manage risk or prevent accident. This hormone is known as adrenaline. They are known as flight or fight hormones.

So therefore, the knowledge I acquired from biology, chemistry and homeostasis will used to make my career more productive in the nearest future.

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Based on the heat of solution, the increase in temperature rise when an 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter is 95.48 K.

The increase in temperature rise when an 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter is determined using the formula below:

mass of water = 111.5 g

c = 4.18 J/g.K

Heat of solution, ΔH = 44.5 kJ/mol

ΔT = ?

Mole of NaOH in 8.54 g NaOH = 8.54/40

Mole of NaOH in 8.54 g NaOH= 0.2135 mol of NaOH

Solving for ΔT;

44.5 kJ/mol = 111.5 * 4.18 * ΔT

44.5 kJ/mol = 466.07 * ΔT

ΔT = 44.5 / 466.07

ΔT = 95.48 K

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70.33 L  is the volume of 10 moles of a gas at 300 K held at a pressure of 3.5 atm.

Volume is the percentage of a liquid, solid, or gas's three-dimensional space that it occupies.

Liters, cubic metres, gallons, millilitres, teaspoons, and ounces are some of the more popular units used to express volume, though there are many others.

We will use ideal gas law to find the volume

PV = nRT

Can also be written as

V = (nRT)/P

Where,

P = pressure

V = volume

n = amount of substance

R = ideal gas constant

T = temperature

Here, we have given

P = 3.5 atm

V = to find

n = 10 moles

R = 0.08206 L⋅atm/K⋅mol

T = 300k

Lets substitute the values

V = (10 × 0.08206 × 300)/3.5

V =  70.33 L

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Based on the principles of spectrophotometry, the least useful to determine the concentration of the sample using a spectrophotometer set at 640nm is: the volume of a sample; option A.

Spectrophotometry is an analytical technique that is used to measure the concentration of a solution by measuring how much light the solution absorbs or transmits when a beam of light of a given wavelength is passed through it.

In spectrophotometry, the concentration of a solution is directly proportional to its absorptivity. This implies that the higher the concentration of a solution, the higher the amount of light absorbed by the solution.

The absorptivity of the solution is inversely proportional to the transmissivity of the solution.

The higher the concentration, the lesser the amount of light the solution will transmit.

The factors that are important in calculating the concentration of a solution are:

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The volume (in cm) does a 26.0 g piece of Cu is 2.90 cm³.

Density is the substance's mass in keeping with a unit of volume. The image most often used for density is ρ, despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by volume.

Mass, extent, and density are three of an object's maximum simple residences. Mass is how heavy something is, quantity tells you how big it is, and density is mass divided through volume. although mass and extent are houses you deal with each day, the concept of density is a little much less obvious and takes a cautious idea.

The components for density are the mass of an object divided by means of its volume. In equation shape, it is d = m/v, in which d is the density, m is the mass and v is the volume of the object. the standard devices are kg/m³.

Density = mass / volume

Volume = mass/density

             = 26/8.96

             = 2.90 cm³

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The dissociation constant of Ka is 7.83 × 10³ .

In chemistry, the molar mass of a chemical compound is determined by dividing its mass by the quantity of the material, or the number of moles in the sample, expressed in moles. A substance's molar mass is a bulk attribute, not a molecular one. Mass per mole is one way to define molar mass. Molar mass is, in other words, the total mass of all the atoms in a substance that makes up a mole. It is quantified in grams per mole.

Molar mass is shown for substances or molecules. The molar mass of a single element or atom would simply be that element's mass represented in atomic mass units.

Mass of HN[tex]O_{2}[/tex] = 1.93g

Volume of solution = 500 ml

[tex]H^{+}[/tex] equilibrium = 7.63 × [tex]10^{3}[/tex] m

Molarity of HN[tex]O_{2}[/tex] = mol [tex]HNO_{2}[/tex] /vol in2

mol [tex]HNO_{2}[/tex]

= mass(g) / molar mass

= 1.93/42.0129 g/mol

= 0.04105

Hence ,

molarity of HNO2

= 0.04105/0.5L

= 0.0821 M

Reaction

HNO2 ⇄ H+  NO2

x = [tex]H^{+[/tex] = 7.63 × [tex]10^{3}[/tex] M

= 0.0821 - 7.63 [tex]10^{3}[/tex]

= 0.0821 - 0.00763

= 0.0745 m

[tex]H^{+}[/tex] = 7.63 × [tex]10^{3}[/tex]

[tex]NO_{2}[/tex]  = x = 7.63 × [tex]10^{}[/tex]³

Dissociation of constant ka

ka = [tex]H ^{+} NO_{2} ^{-}[/tex]/ HNO²

=[tex]10^{3}[/tex]  × 7.83

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Interpretation of equation for a chemical reaction using the coefficients

On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).

On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).

chemical reaction: a process in which one or more substances—the reactants—are changed into one or more additional substances—the products. Chemical elements and compounds are both substances. To produce different substances as products, a chemical reaction rearranges the atoms that make up the reactants. Technology, culture, and life itself are all influenced by chemical reactions.

Numerous activities that involve chemical reactions have been known and used for thousands of years, including burning fuels, smelting iron, creating glass and pottery, brewing beer, and producing wine and cheese.

Numerous intricate processes that take place in all living systems, as well as the Earth's geology, atmosphere, and oceans, involve chemical reactions.

We have given the following chemical reactions

N₂(g) + 2O₂(g) → 2NO₂(g)

The changes in two levels, the particulate level and the molar level, can be  interpret using the balanced equation.

On the particulate level, we always consider discrete molecules.

On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).

We think in terms of moles On the molar level, considering 1 mole of particles = 6.02 × 10²³ particles.

On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).

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