Plutonium-238 undergoes alpha decay as shown:
238 PuX+He
94
Enter the appropriate values for A and Z and the chemical
symbol for X.
A:
Z:
X:
0

We can predict formula of ionic compounds by:

These are the few guidelines we can use to product formula.

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The volume of the platinum solid is determined as 8.16 cm³.

The volume of the  platinum solid is calculated from its density and mass as shown below.

V = m/ρ

where;

Volume of the platinum solid is calculated as follows;

V = 175 g / 21.45 g/cm³

V = 8.16 cm³

Thus, the volume of the platinum solid is determined as 8.16 cm³.

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The maximum mass of sodium chlorate that will dissolve in 40g of water 30 degrees is 3.98816 g.

The maximum mass is the theoretical yield that can be produced in a chemical reaction.

Given that, the temperature T is 30°C

The mass is 40 grams

S = 0.0043302 + 0.084330 + 3.5714 = 9.9704 g Sodium chlorate per 100 g water

Since 100 g of water can dissolve 9.9704 g of Sodium chlorate

By the formula of maximum mass

40 g of water can dissolve

(9.970440) / 100  = 3.98816 g Sodium chlorate

Thus, the maximum mass of sodium chlorate is 3.98816 g.

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The unknown temperature of the second sample is 80 degree C

In the law of conservation of energy, energy neither be created nor be destroyed - only it change one form to another form of energy.

Now,

Mass of the first sample of water , m1 = 100 g

Initial temperature for first sample , t1 = 20 degree C

Mass of the second sample of water , m2 = 100 g

Initial temperature of the second sample , t2 = ?

Final temperature for first sample = 40 degree C

c is known as the specific heat of the water

Now we are solving this problem the law of conservation of energy

Q(gain) = - Q(lost)

(m1c(delta t)1) = -(m2(delta t)2)

m1(Final temperature- t1) = - m2(Final temperature- t2)

t2 - Final temperature = m1(Final temperature- t1) / m2

t2 - 40 = 100 (40 - 20) / 100

t2 - 40 = 20

t2 = 20 + 40

t2 = 80 degree C

Hence, the initial temperature of second sample is 80 degree C

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The density of the unknown liquid is 1.64 mL

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

We can obtain the volume of the container by calculating the volume of the water. This is illustrated below:

Density = mass / volume

Thus,

Volume = mass / density

Volume of water = 2.71 / 0.997048

Volume of water = 2.718 mL

Density = mass / volume

Density of unknown liquid = 4.45 / 2.718

Density of unknown liquid = 1.64 mL

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The conversions that could be performed with these two conversion factors alone, Density—> molar mass or/formula mass—> is volume ---> moles; option D

Conversion factors are expressions or values which are used to convert from one unit or value to another.

The conversion factor given is:

Density—> molar mass or/formula mass—>

volume = density/mass

moles = mass/molar mass

Volume to moles = density/mass -->  mass/ molar mass

Volume to moles = density ---> molar mass or formula mass

The conversion of volume to moles will therefore require density and molar mass or formula.

In conclusion, conversion factors are used to convert from one unit  value to another.

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The standard enthalpy of reaction in the thermochemical equation:

2 Al(s) + Fe₂O₃ (s) → 2 Fe(s) + Al₂O₃ (s) is  859.3 kJ/mol

The enthalpy of a given reaction is the amount of heat given off or absorbed when reactants react to form products in that reaction.

A reaction having negative enthalpy change indicates that heat is given off in the  reaction and the reaction is said to be exothermic.

A reaction having positive enthalpy change indicates that heat is absorbed in the  reaction and the reaction is said to be endothermic.

The amount of heat given off or the enthalpy change when one mole of aluminum metal completely reacts with iron(III) oxide to form aluminum oxide and iron metal is 429.6 kJ of heat.

The correct value for the standard enthalpy of reaction in the thermochemical equation below is determined as follows:

2 Al(s) + Fe₂O₃ (s) → 2 Fe(s) + Al₂O₃ (s)

According to the equation of the reaction,  two moles of aluminum reacts completely with iron(III) oxide to form aluminum oxide and iron metal.

The standard enthalpy of reaction = 429.6 kJ/mol * 2

The standard enthalpy of reaction = 859.3 kJ/mol

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Answer:

both because water changes to ice in a freezer and liquid turns into gas when heated at a certain temperature

The volume of 0.122 M hydrobromic acid required to react completely with 142 mL of 0.166 M lithium sulfide is 386 mL

2HBr(aq) + Li₂S (aq) → H₂S (g) + 2LiBr

From the balanced equation above,

From the question given above, the following data were obtained:

CaVa / CbVb = nA / nB

(0.122 × Va) / (0.166 × 142) = 2

(0.122 × Va) / 23.572 = 2

Cross multiply

0.122 × Va = 23.572 × 2

Divide both side by 0.122

Va = (23.572 × 2) / 0.122

Va = 386 mL

Thus, the volume of hydrobromic acid required for the reaction is 386 mL

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A wild fire could enable more nutrients to renter the soil.

A wild fire is a situation in which fire consumes a large portion of the ecosystem. This is common in summer when the temperatures are very high and the sun is blazing. The outrageous heat could lead to fires that begin to blaze and destroy the vegetations and the entire ecosystem.

Traditionally, we have been told that this could be a very destructive occurrence and that it could lead to the destruction of the ecosystem and death of trees.

However, recent evidence suggests that there could be some benefits to wild fires in the sense that it clears the forest floors and enables nutrients to reenter the soil.  As such, as the forest recovers, the plant and the animal species continue to experience a boom.

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The following are true about the chemical formula;

The chemical formula of a compound is the representation of the substance of paper. We can use the chemical formula of a compound to show the way that the compounds are or the atoms that compose them.

The following are true about the chemical formula;

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The mass of camphor (C₁₀H₁₆O) that contains 1×10⁹ hydrogen atoms is 1.58×10⁻¹⁴ g

We'll begin by obtaining the mole of hydrogen that contains 1×10⁹ atoms. This can be obtained as follow:

From Avogadro's hypothesis,

6.02×10²³ atoms = 1 mole of hydrogen

Therefore,

1×10⁹ atoms = (1×10⁹ atoms × 1 mole) / 6.02×10²³ atoms

1×10⁹ atoms = 1.66×10⁻¹⁵ mole of hydrogen

Now, we shall determine the mole of C₁₀H₁₆O that contains 1.66×10⁻¹⁵ mole of hydrogen. This is illustrated below

16 moles of H is present in 1 mole of C₁₀H₁₆O.

Therefore,

1.66×10⁻¹⁵ mole of H will be present in = (1.66×10⁻¹⁵ × 1) / 16 = 1.04×10⁻¹⁶ mole of C₁₀H₁₆O

mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of C₁₀H₁₆O = 1.04×10⁻¹⁶ × 152

Mass of C₁₀H₁₆O = 1.58×10⁻¹⁴ g

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The empirical formula of the original compound given the combustion analysis data is C₂H₄O

Mass of C = (12 / 44) × 8.802

Mass of C = 2.4 g

Mass of H = (2 / 18) × 3.604

Mass of H = 0.4 g

How to determine the mass of O

Mass of O = (mass of compound) – (mass of C + mass of H)

Mass of O = 4.406 – (2.4 + 0.4)

Mass of O = 1.606 g

Divide by their molar mass

C = 2.4 / 12 = 0.2

H = 0.4 / 1 = 0.4

O = 1.606 / 16 = 0.1

Divide by the smallest

C = 0.2 / 0.1 = 2

H = 0.4 / 0.1 = 4

O = 0.1 / 0.1 = 1

Thus, the empirical formula of the compound is C₂H₄O

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The amount of calories consumed in 365 day is 10877 calories.

Energy is the ability to do work.

Energy is present in the food that we eat such carbohydrates, protein, and lipid,

The SI unit of energy is Joules.

However, calories is the unit used in measuring energy found in foods.

For carbohydrate, the energy in calorie present per gram of carbohydrate is 3.87 cal/g.

The 20.0 ounce  bottle of Mountain Dew contains 77.0 g of sugar.

Amount of energy in one bottle = 3.87 * 77 = 298 cal

In 365 days, amount of calories consumed = 298 cal * 365

amount of calories consumed = 10877 calories

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The assertion and the reason that is given for HCl and zinc granules are true, but the reason is not correct for the assertion.

The assertion is the statement that is taken on the hypothesis. A chemical reaction takes place when weak hydrochloric acid is applied to a test tube containing zinc granules.

Here, we can observe how bubbles from the test tubes cause a colorless, odorless gas to develop.

As a result, when zinc granules are inserted in a test tube and diluted hydrochloric acid is added, A colorless, odorless gas that is evolving with bubbles was seen.

Thus, for HCl and zinc granules, both the claim and the explanation are accurate, however, the explanation is flawed in support of the claim.

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Answer:

93.7 feet

Explanation:

To convert meters to feet, all you have to do is multiply by 3.281.

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1. Lewis acid- electron pair acceptor.

2. Lewis base- electron-pair donor.

3. Bronsted acid- proton donar

4. Bronsted base- proton acceptor

5. A compound that acts as both a bronsted-lowry acid and base together is called amphoteric.

Machine parts, bodily processes or functions, healing mechanisms. A combination of mental processes, a psychological mechanism by which a result is achieved. A fundamental physical or chemical process involved in or responsible for an action-reaction or another natural phenomenon.

The difference between process and mechanism as nouns is that process is a sequence of events to achieve a result, and mechanism is in a machine or mechanism, especially as opposed to a product. Inside the machine or machine park. A mechanical means of transducing or controlling motion or transmitting or controlling force.

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This is the reaction when the 2-pentanone is converted into pentanol.

The presence of aldehyde converts the ketone to alcohol.

What mechanism is used?

The mechanism used is of aldehyde converting ketones to alcohol. The steps are as:

The types of acids and bases are shown as:

What are Lewis acids ?

Lewis acids are the compounds or ionic species that can accept an electron pair from any donor compound.

What are Lewis bases ?

Lewis base is the donor compound or ionic species.

What are Bronsted acids or bases?

Bronsted - Lowry acids are substance which donate H+ ions and these later forms a conjugate base while a Bronsted - Lowry bases are those substances which accepts H+ ions and they in return forms a conjugate acid.

A compound that acts as both a Bronsted - Lowry acid and base together is called amphoteric.

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Answer:

1.) NH₄

Explanation:

Atoms are depicted by letters in chemical formulas. Nitrogen atoms are represented by the letter "N" and hydrogen atoms are represented by the letter "H". One letter indicates one atom.

As such, if there is 1 nitrogen atom and 4 hydrogen atoms in ammonium, the chemical formula is NH₄.

The elements that would form metallic bonds are as follows:

A metallic bond in chemistry is a chemical bond in which mobile electrons are shared over many nuclei and therefore, leads to electrical conduction.

Metallic bonds are formed strictly by metallic elements in the periodic table.

Iridium is a chemical element with symbol Ir with an atomic number of 77. It is a very hard, brittle, silvery-white transition metal.

Iron is also a metallic chemical element with symbol Fe.

Therefore, the elements that would form metallic bonds are as follows:

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Answer:

Iridium

Cadmium

Iron

Explanation:

Test.

Regular maintenance inspections and the replacement of damaged underground tanks are necessary to prevent gasoline leaks.

Therefore, gasoline leaks can be avoided by performing routine maintenance checks and replacing damaged underground tanks.

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Using the dimensional analysis, The conversion of 500.0 calories is 2.092 x 10⁶ joules.

The Joule is the unit of work or energy in the SI system (J). A force of one Newton traveling one meter in its own direction produces the work equivalent to one joule.

Our bodies store extra calories as body fat when we consume more calories through food and drink than we burn off. If this keeps happening, we might eventually gain weight.

There are different units, which is why there is a conversion of these units.

1 kilocalorie = 4184 joule

500 x  4184 =  2.092 x 10⁶

500.0 = 2.092 x 10⁶

Thus, the conversion is 500.0 calories is 2.092 x 10⁶ joules.

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They wanted all nations to focus on domestic issues and not get involved with each other.

Churchill stated, "I conceived an admiration for him as a statesman, a man of affairs, and a war leader," following Roosevelt's death on April 12, 1945. He was the best American friend that Britain has ever found, continued Churchill. The "Special Relationship" was created by their close personal relationship.

Along with agreeing to include France in Germany's postwar governance, Roosevelt, Churchill, and Stalin also agreed that Germany should bear some, but not all, of the burden of making reparations after the war.

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Answer:

If a measurement closely matches the recognized standard for that measurement, it is considered accurate.

Explanation:

Precision:

“Precision means how close the measured values are to each other.”

A precise measurement is one that has less absolute uncertainty.

Measurement of Precision:

The Precision of measurement is found out by the instrument being

used. It is described by the least count of the measuring instrument. The smaller a physical quantity, the more precise instrument should be used.

Example:

Let the length of a pencil is measured with a meter rod and vernier caliper.

It shows that readings of the vernier caliper are more precise than the metering rod.

The molar mass of  Co(NO₃)₂ is 182.9 g/mol.

The molar mass of a compound is the mass of one mole of that compound.

The molar mass of a compound is determined from the sum of the atomic masses of the elements in the compound.

The molar of  Co(NO₃)₂ is determined as follows:

atomic mass of Co = 58.9 g/mol

atomic mass of N = 14 g/mol

atomic mass of O = 32 g/mol

Molar mass of  Co(NO₃)₂ = 58.9 + 2 *  (14 + 16 * 3)

Molar mass of  Co(NO₃)₂ = 182.9 g/mol

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