3. Give two reasons why there are different values for the weighted average atomic mass of Candium
in the class.

The following best describes a community

community is best describes as  An interacting group of populations that occupy the same area

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Explanation:

make up some of your own signs which can warns people about the dangers of river an ocean a large snake hiding in the bush

Answer:

The definition and all examples are correctly mentioned only one mistake is spotted which is transfer of energy as heat included in Intensive Property which is wrong.

Explanation:

Intensive Property: Intensive properties are those properties which are Independent of the amount substance present.

For e.g. The melting point of ice on standard temperature & pressure is constant i.e. 0°C.

1 gram of ice will melt at 0°C so will be 1 kilogram ice. Hence melting point & similarly boiling point also is an Intensive Property.

before talking about Density let's understand Extensive properties.

Extensive Property: Extensive properties are those properties which are Dependent of the amount substance present.

for e.g. Volume, Weight, Mass, Length, Energy, Enthalpy, Entropy etc.

When One extensive divided by another extensive Property then perticular that property of substance is also intensive property.

Now we know that,

[tex] \sf Density = \frac{Mass}{volume} [/tex]

Where mass & volume both are extensive properties, hence density is an intensive property.

Ability to conduct electricity is called as Thermal Conductivity which is an intensive property.

The thermal conductivity of a perticular material does not change it varies material to material.

Transfer of energy as heat, let's have quick look at heat & temperature relation given by,

[tex]C = \frac{Q}{\Delta T} [/tex]

Where C is specific heat capacity which is an intensive property & specific heat is the ratio of added heat to the change in temperature & Heat is an Extensive property.

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Answer:true

Explanation:

if you change the sequence, the answer you get may be wrong.

Density is a physical property that relates the mass of a substance with the volume occupied by the mass of the substance. The density of the substance can be used to examine the purity of the substance.

4.80 grams of oxygen will be release.

When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:

2KClO3(s) → 2KCl(s)+ 3O2(g)

mass of potassium chlorate   = 12.25g

mole of KClO3 = 12.25/122.5 = 0.1 mol

2 mole KClO3 (consumed) = 3 mole O2 (produced)

1 mole KClO3 = 3/2 mole O2

0.1 mole KClO3 = 0.1*1.5 mole O2

                          = 0.15 mole O2

mass of O2 = 0.15 * 32 = 4.80 grams

4.80 grams of oxygen will be release.

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Ferric chloride combines with water in a reversible reaction to produce ferric hydroxide and hydrochloric acid as shown.

[tex]FeCl_{3}[/tex] + 3H₂O → [tex]Fe(OH)_{3}[/tex] +  3HCI

The reaction which must occur at the same time as the formation of ferric hydroxide are given below .

[tex]FeCl_{3}[/tex]  → Fe · + Cl ·

So , option C is correct one .

The water ionizes to hydrogen and hydroxide ions and the ferric chloride in the water ionizes to iron, or ferric and chloride ions. As a result, the solution becomes more hydrogen ion-rich than it was before the precipitation, which causes the solution to become acidic.

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Answer:

The real answer is Fe(OH)3 + 3HCI - FeCl3 +3H2O

Explanation:

I took the test and this was the correct answer.

The calculated medication dose is 3.010³g/kg

Patients receive medications either as a dosage or as a single dose. These two terms have various connotations. A dosage is a set amount of medication administered all at once. It is a singular value for mass or volume. It can alternatively be described as the mass or volume of the medicine divided by the patient's body weight. A drug's dosage is the precise quantity, number, and frequency of doses given over a precise period of time.

The dose (one time) of medication for an adult patient is the subject of this question. The patient mass is given in pounds, and the drug mass is supplied in milligrams; m drug = 200 mg

145 lbs., patient

In order to respond to this query, we convert the patient's mass to kilograms and the drug mass to micrograms:

Drug = 200 mg, 10³ mg, and 2.00, 10⁵ g

145 lb patient = kg/2.20 lb = 65.9 kg

The medication dose is:

mdrug Mpatient = 2.0010⁵g/65.9kg

= 3.010³g/kg

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Answer:To find the volume of a rectangular prism, we multiply the length of the prism by the width of the prism by the height of the prism.


honeslty

Explanation:

Magnesium is not a good conductor. Hence, the conductivity of magnesium is not good.

Magnesium is placed in group 2 of the periodic table. It has 2 valence electrons which are in the fully filled s-subshell. When the subshell is fully filled, the electrons are not available to move to conduct. For example, group 1 has half filled subshell which allows the electrons to move.

But, how does magnesium conduct? As its subshell is fully filled and therefore no electrons are available to move.

In group 2 metals, there is a property called s-p hybridization. The s- and p- subshells overlap so that metals can now move to the unfilled states of the p-subshell.

Hence, magnesium is not a good conductor.

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Taking into account the definition of molar concentration and molar mass, the mass of potassium hydroxide, KOH, required to prepare 174.59 cm³ of a 0.864 mol/dm³ solution is 8.45988 grams.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by:

Molarity= number of moles÷ volume

The molar mass of substance is defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

In this case, you know that:

Replacing in the definition of molar concentration:

0.864 mol/dm³= number of moles÷ 0.17459 dm³

Solving:

0.864 mol/dm³ ×0.17459 dm³= number of moles

0.1508 mol= number of moles

The molar mass of KOH is 56.1 g/mol. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 56.1 grams, 0.1508 moles of the compound contains how much mass?

mass= (0.1508 moles×56.1 grams)÷ 1 moles

mass= 8.45988 grams

In summary, the mass of potassium hydroxide, KOH, required to prepare 174.59 cm³ of a 0.864 mol/dm³ solution is 8.45988 grams.

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Answer:

a

Explanation:

because this could be down to coincidences whereas the others could be explained with scientific experiments

Answer:

A

Explanation:

Must be testable - A is not

The planet’s diameter would be approximately the distance across the United States Mercury.

What is planet mercury known for?

Therefore, The planet’s diameter which would be approximately the distance of the United States is Mercury.

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Answer: Protects your eyes from chemical splashes, Must be worn during all labs, from start to lab checkout, in which chemicals, glass or heating of substances is involved. No exceptions!!

Answer: I, II, V

Explanation:

The value of the rate constant at 820.0 K is 0.2 s^-1

Applying the Arrhenius equation, which is...

k = Ae-Ea/RT

Applying the formula, we get

lnk2 = lnk1 - (Ea/R)(1/T2 - 1/T1)

Applying the values, we get

ln k2 = ln 6.1x10^-8 - (2.62x10^3/8.314)(1/820 - 1/600)

Calculating the value, we get...

ln k2 = -0.31

Taking power e, we get

k2 = 0.2 s^-1

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  3.5 × 10^6 g

according to ideal gas equation, PV = nRT

where, p is pressure v is volume, n is mole of gas, r is gas onstant and t is temperature.

Pressure (p) = 741 Torr = 1 bar

Volume (V) = 5.40 ml= 0.0054litre

Amount of substance (n)  mol = ?

Temperature (T)  44°C= 371kelvin

so by putting all values in equation. PV = nRT

         = 1 ×  0.0054 =n ×8.31 ×371

         n ≈ 0.000002 = 2.0 × 10^-6

now, n is mole of gase,

mole = given mass ÷ molecular mass

given mass = 7.10g

molecular mass = given mass ÷ mole

                         7.10 ÷ 2.0 × 10^-6

                  = 3.5 × 10^6 g

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Aliphatic compounds, on the other hand, are organic substances whose carbon atoms link with one another in open chains, either straight or branched, as opposed to containing a benzene ring. Aromatic compounds are organic substances with a planar unsaturated ring of atoms that is stabilized by an interaction of the bonds forming the ring. As a result, the primary distinction between aromatic and aliphatic chemicals is that aromatic compounds lack a cyclic structure while aliphatic compounds have straight, branching, or cyclic structures. Additionally, while the majority of aliphatic molecules are odorless, all aromatic compounds have a sweet, pleasant fragrance.

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Answer:  [D]:  " 75 g of salt in 100 mL of water. "

____

Explanation:

         By looking at the answer choices—we can tell that all 4 (four) values for the "solvent"—[in this case: "100 mL of water".].

Note:  As a general rule—and at this point in our problem—
The answer would be:
           The solution with the most 'concentration' of solute—per the same volume of solvent—would be the most 'concentrated' solution—
would be Answer choice:  [D]:  " 75 g of salt in 100 mL of water."

Note:  Answer Choice:  [D]—has the most solute (grams of salt)—compared with the 'other values' given in the 'other' answer choices.
       →   Specifically, refer to the other answer choices:

            →  " [D:  75 g]   >   [C:  50 g]   >   [B:  40 g]   >  [A:  35 g ] ".
____
            Wishing you well in your academic pursuits—and within the "Brainly" Community" !
____

Differences between oxygen and ozone

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Explanation:

In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products. In a chemical reaction, only the atoms present in the reactants can end up in the products.

Answer:

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.

Explanation:

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.

Atoms can not be divided is the incorrect idea in Bohr’s understanding of the atom.

Bohr believed that electrons circled the nucleus in orbits. According to current atomic theory, electrons don't follow predetermined routes.

Bohr believed that electrons traveled in circular paths around the nucleus, but current theory suggests that the structure of atomic electrons is more to 3D standing waves.

Bohr improved on Rutherford's atomic model. The majority of the atom's mass is concentrated in its nucleus, which we now refer to as the center of the atom, and electrons surround the positive mass in a manner to a cloud. Bohr's use of the quantification energy to explain the model was his most important contribution. According to his theories, electrons circling the nucleus have quantized potential and kinetic energies.

The Heisenberg Uncertainty Principle is first violated by the Bohr model because it assumes that electrons have a known orbit and radius. The Bohr Model is less effective at drawing diagrams of larger atoms and gives an incorrect value for the ground state orbital angular momentum.

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The correct answer is 329.4 Cal.

Remember that specific heat is the ratio of the amount of heat needed to raise a body's temperature by one degree compared to the amount of heat needed to raise the temperature of an equivalent mass of water by one degree, or that specific heat capacity is the amount of heat energy needed to raise a material's temperature by one kelvin (K) per kilogramme.

Mass of sample=50.00-g

Specific heat of metal=0.108 cal/g °C

Change in temperature=78.0 °C-17.0°C=61.0°C

Heat Released by metal can be calculated as follows:

Heat Released = Mass of sample  x Specific heat x  Change in temperature

Heat Released = 50.00 g x  0.108 cal/g °C x 61.0°C

Heat Released = 329.4 Cal

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The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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Answer:

b

Explanation:

ason solved this problem by changing 6/4 to 1.2. He then added 1.2 to 0.68 and got 1.88.

This answer is incorrect. What did he do wrong?

0.05016 grams is there if you have 2.85x10^-4 with 176g/mol.

The mass of a certain molecule is its molecular mass, which is expressed in daltons. Because they contain various isotopes of an element, multiple molecules of the same substance can have distinct molecular weights.

mole = 2.85x10^-4

mol. weight = 176g/mol

Formula,

mole = weight taken / mol. wt of the compound

2.85x10^-4  = weight taken / 176g/mol

weight taken = 2.85x10^-4 x  176g/mol

                     =0.05016 grams

0.05016 grams is there if you have 2.85x10^-4 with 176g/mol.

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The concentration of the urine is determined as 1.002 g/ml.

The concentration of a chemical substance expresses the amount of a substance present in a mixture.

The concentration of the urine is determined from the ratio of mass to volume of the urine or density of the urine.

Urine Concentration = mass / volume

Urine concentration = 4 .007 g / 4 ml

Urine concentration = 1.002 g/ml

Thus, the concentration of the urine is determined as 1.002 g/ml.

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The complete question is below:

determine the concentration of the urine.

A chemical element that has an atomic number less than 58 and an atomic mass greater than 135.6m is barium (atomic no. 56 and atomic mass137.13 ) and lanthanum (atomic no. 57  and atomic mass 135.6).

Barium is an element with the symbol Ba and atomic number 56. It is an alkaline earth metal that is soft and silvery, and it is the fifth element in group 2. Barium is never found in nature as a free element due to its extreme chemical reactivity. Oil well drilling fluid uses barium sulfate as an insoluble ingredient. It is employed as an X-ray radiocontrast agent in a purer form to image the human gastrointestinal tract. Barium compounds that dissolve in water have been employed as rodenticides despite being hazardous.

Chemical element lanthanum has the atomic number 57 and the symbol La. It is a silvery-white, ductile, soft metal that slowly tarnishes when exposed to air. It serves as the eponym for the group of 15 related elements in the periodic table between lanthanum and lutetium, of which lanthanum is the first and prototype. The rare earth elements traditionally include lanthanum.

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1. The empirical formula of the weak acid is H₂PO₃

2. The molecular formula of the weak acid is H₄P₂O₆

The empirical formula of the compound can be obtained as follow:

Divide by their molar mass

H = 0.0220 / 1 = 0.022

P = 0.3374 / 31 = 0.01

O = 0.5227 / 16 = 0.03

Divide by the smallest

H = 0.022 / 0.01 = 2

P = 0.01 / 0.01 = 1

O = 0.03 / 0.01 = 3

Thus, the empirical formula of the compound is H₂PO₃

Molecular formula = empirical × n = mass number

[H₂PO₃]n = 162

[(1×2) + 31 + (16×3)]n = 162

81n = 162

n = 162 / 81

n = 2

Molecular formula = [H₂PO₃]n

Molecular formula = [H₂PO₃]₂

Molecular formula = H₄P₂O₆

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