What makes physical change a physical change and a chemical change a chemical change

Answer: The density of a material is defined as its mass per unit volume. In this example, each volume of water is different and therefore has a specific and unique mass. The mass of water is expressed in grams (g) or kilograms (kg), and the volume is measured in liters (L), cubic centimeters (cm3), or milliliters (mL).

Explanation: HOPE IT HELPS :)

Answer:

0.146 M

Explanation:

Use v1s1 = v2s2

here, v1 = 500 mL, v2 = 700 mL, s1 = 0.205 M & s2 = new concentration

It is best to fill the pipet to a point just above the calibration line, then adjust the volume by slowly releasing liquid, which will help to be more successful when working with a pipet.

To use a pipet successfully, it is important to ensure that the tip of the pipet is kept submerged when filling, as this will help to prevent air from getting into the pipet. Once the pipet is filled, it is best to fill it to a point just above the calibration line, then adjust the volume by slowly releasing liquid. This will help to reduce the chances of overfilling or spilling the liquid.

It is also important to be gentle when placing the pipet bulb on the pipet, as aggressive movements can cause the bulb to come loose or even break, resulting in injury. Additionally, the blue bulbs used in the lab are not meant to be attached to the pipet, but rather simply rest on top of it.

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Water is oxidized and reduced at both electrodes

Electrolysis utilizes electrical energy to carry out non-spontaneous redox reactions. The ions in the solution flowed by an electric current will move toward the electrode opposite the charge.

The negative ions from the solution will move towards the positive electrode, and release electrons around the positive electrode (oxidation occurs) and electrons flow to the negative pole

While around the negative electrode electron binding occurs and a reduction reaction occurs

the reaction at the cathode:

1. the reduced active metal is water, other than that the metal will be reduced

2. H⁺ of the acid will be reduced

For reactions in anode:

1. if the electrodes are not inert then the metal is oxidized

2. If inert then:

a. OH⁻ from the base will be oxidized

b. The halogen metal will oxidize

2H₂O(l)+2e⁻⇒ H₂(g)+2OH⁻(aq)

2H₂O(l)⇒4H⁺(aq)+O₂(g)+4e⁻

MnO4- + 4e- → MnO2 + 2H2O Now the half-equation is balanced in alkaline medium.

To balance the half-equation MnO4- → MnO2 in alkaline medium, we need to follow the steps for balancing redox reactions in basic solution. The goal is to balance the number of atoms and charges on both sides of the equation.

Start by balancing the atoms other than oxygen and hydrogen. In this case, we only have manganese (Mn) atoms. There is one Mn atom on both sides, so the Mn atoms are already balanced.

Balance the oxygen atoms by adding water (H2O) molecules to the side that lacks oxygen. Since there are four oxygen atoms on the left side (MnO4-) and only two on the right side (MnO2), we need to add two water molecules to the right side:

MnO4- → MnO2 + 2H2O

Next, balance the hydrogen atoms by adding hydrogen ions (H+) to the side that lacks hydrogen. In this case, the left side (MnO4-) already has sufficient hydrogen atoms, so no hydrogen ions need to be added.

Balance the charges by adding electrons (e-) to the side that has a higher charge. MnO4- has a charge of -1, while MnO2 has no charge. Since the left side has a higher charge, we need to add electrons to the right side:

MnO4- + 4e- → MnO2 + 2H2O

Now the half-equation is balanced in alkaline medium. The Mn atoms, oxygen atoms, hydrogen atoms, and charges are all balanced. The addition of water and hydrogen ions helps balance the oxygen and hydrogen atoms, while the addition of electrons balances the charges.

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Answer:

d. All of the above

Explanation:

d. All of the above

Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.

Imperial Spanish Crown would have the authority to assign people to posts in the church, give its consent for churches to be built, and allow missionary activity to continue.

The Royal Palace downtown Madrid is home to the crown and scepter of something like the National Heritage Imperial Collections, which date first from reigns of Carlos II through Carlos III. The genuine heirs of the old dynasty's successors will receive the Spanish Crown.

Amadeo I of Spain, an Italian prince, won the election and was crowned king. He was forced to resign, though, in 1873, after three years. We may claim that up through 1873, the year that the First Spanish Republican must have been founded, the monarchy ruled Spain.

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Answer:

The flask has to be closed during the hydrochloric acid and sodium carbonate reaction as the resultant gas got trapped inside the closed flask.

Explanation:

The hydrochloric acid and sodium carbonate reaction was exothermic that caused the pressure to decrease. The flask has to be closed during the hydrochloric acid and sodium carbonate reaction as the resultant gas got trapped inside the closed flask.

In exothermic reactions, energy is produced in the form of heat or light.

Answer: A deer that lives in a meadow would likely eat a variety of plants, such as grasses, leaves, and shrubs. Depending on the season and the availability of food, the deer's diet may also include fruits, nuts, and other plant materials. In some cases, deer may also eat insects or other small animals if they are available.

As for what eats the deer, there are many potential predators depending on the location and environment of the meadow. In some areas, predators of deer could include wolves, coyotes, cougars, or bears. In other areas, deer may be hunted by humans. In addition, some birds of prey, such as eagles or hawks, may also prey on deer, particularly fawns or other young deer.

Explanation:

Answer:

A. An atom that has lost or gained 1 or more electrons

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Answer:

A mixture of ethane and ethene occupies 40 litre at 1.00 atm and at 400 K.The mixture reacts completely with 130 g of O2 to produce CO2 and H2O . Assuming ...

Missing: 32 ‎Br2

The statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

The average atomic mass could be obtained as the sum of the products of the percentage abundance of each of the hydrogen isotopes and the mass of the isotope.

We know that every element has isotopes. In every sample of the atom, there are various isotopes of the element. Thus the average atomic mass must take into account the masses of all these isotopes.

As such, the statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

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Answer:

it is calcium and bromine

Explanation:

this is because they are both ionic compounds

Answer:

the radius is half the diameter

The radius of a circle is equal to half the diameter.

The concept half life is used here to determine the mass of 'A' remaining after 0.731 min. The rate constant of a reaction is defined as the rate of the reaction when the molar concentration of each of the reactants is unity. The mass of A remaining is 5.163 g.

The half life period of a reaction is defined as the time in which the concentration of a reactant is reduced to half of its initial concentration. The expression for half life period of a first order reaction is:

\(t _{1} /_{2} = 0.693 / k\)

k - rate constant

k = 0.693 / 0.0459 = 15.098 s

Divide by 60 to convert half life into minutes.

15.098 s = 0.251 minutes

The number of half lives that have past is:

0.731 min / 0.251 min = 2.912 ≈ 3

Initial mass / number of half lives = 15.49 / 3 = 5.163 g

Thus the mass of A remaining after 0.731 min is 5.163 g.

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Answer:chlorofluorocarbons (CFCs)

halon.

carbon tetrachloride (CCl4)

methyl chloroform (CH3CCl3)

hydrobromofluorocarbons (HBFCs)

hydrochlorofluorocarbons (HCFCs)

methyl bromide (CH3Br)

bromochloromethane (CH2BrCl)

Explanation:

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The density of the unknown gas would be 0.0010 g/\(cm^3\).

The density of a substance is a property that measures the level of compactness of the substance. The density of a substance is the ratio of the mass of the substance and its volume.

The density of a substance can be mathematically expressed as:

Density = mass in g/volume in  \(cm^3\).

In this case, the volume of the gas is given as 2.75 L while the mass is given as 2.85 g.

2.75 L of gas is equivalent to: 2.75 x 1000

                                             = 2750 \(cm^3\)

Thus, the density of the gas = 2.85/2750

                                        = 0.0010 g/\(cm^3\)

In other words, the 2.95 g sample of an unknown gas stored in a 2.75 L flask will have a density of 0.0010 g/\(cm^3\).

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Answer:

chlorine

Explanation:

The equation presented to us is balanced since we have the same number of atoms of each element on each side of the reaction. So we can continue with the calculations.

To determine the amount of product that we can obtain we must see the stoichiometry of the reaction. We will follow the following steps:

1. We find the moles of C6H6 contained in 15.7g by dividing the mass by the molar mass of C6H6 (78.11g/mol).

2. We find the moles of C6H5Cl that are produced using the ratio C6H5Cl to C6H6 which is equal to 1/1. This is because the coefficients that accompany these molecules are 1 for both.

3. We find the grams of C6H5Cl by multiplying the moles by the molar mass of C6H5Cl(112.56g/mol).

Let's proceed to do the calculations.

1. Moles of C6H6:

2. Moles of C6H5Cl

3. grams of C6H5Cl

If we start with 15.7 of C6H6 we will obtain 22.8g C6H5Cl. The answer will be the first option: 22.8g

For ionic compounds, assume complete dissociation into cations and anions. CsCI,C10Hg,Na3PO4, are mentioned below.

What is compounds ?

A compound combines one or more additional substances to form a new product. The combination of two substances or elements is equal to the mass ratio for making that product. It is attached firmly, and they have equal in all ways to form a combination. The elements both are bonded together. Each compound has its chemical structure; if it breaks, it can either split into two atoms or molecules or in a single. Different types of compounds are present.

What is ionic compound ?

An ion with a positive charge is a cation, whereas one with a negative charge is an anion.

It is equal to the numbers of ions that form when an ionic compound dissolves.

if i>1, the molecules are said to be dissociated.

if i=1, the molecules have neither associated nor dissociated.

if i<1, the molecules have associated.

CsCl

vant hoff factor i= 2

C₁₀H₈

vant hoff factor i= 1

Na₃Po₄

vant hoff factor i= 3+1= 4.

Therefore, For ionic compounds, assume complete dissociation into cations and anions. CsCI,C10Hg,Na3PO4, are mentioned above.

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Answer:

A. True

Explanation:

many over-the-counter (OTC) drugs that can be abused and even habit-forming, with potentially life-threatening consequences.

Answer:

True

Explanation:

Anything is dangerous if used the wrong way

Answer:

When in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.

Explanation:

Answer

when in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.

Explanation:

Answer:

Latitude

ocean currents

Wind

Elevation

Water