Which of the following is true for an excess reactant?

A) It is the reactant whose atoms remain unbalanced in the equation.
B) It is the reactant that produces a smaller amount of a product.
C) It is the reactant that is left over after the reaction stops.
D) It is the reactant that produces one mole of a product.

Answer:

2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF

Explanation:

AlF₃ + Li₂O —> Al₂O₃ + LiF

The above equation can be balanced as follow:

AlF₃ + Li₂O —> Al₂O₃ + LiF

There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by writing 2 before AlF₃ as shown below:

2AlF₃ + Li₂O —> Al₂O₃ + LiF

There are 6 atoms of F on the left side and 1 atom on the right side. It can be balance by writing 6 before LiF as shown below:

2AlF₃ + Li₂O —> Al₂O₃ + 6LiF

There are 2 atoms of Li on the left side and 6 atoms on the right side. It can be balance by writing 3 before Li₂O as shown below:

2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF

Thus, the equation is balanced..!

Answer:

OJ.J. Thomson

Explanation:

True. When ionic compounds are dissolved or thrown into water, they typically dissociate into ions and become electrolytes.

An electrolyte is a substance that conducts electric current when dissolved in water or molten form due to the presence of freely moving ions. Ionic compounds consist of positively charged cations and negatively charged anions held together by electrostatic forces. When they come into contact with water, the water molecules surround the ions and weaken the forces holding them together, causing the compound to dissociate into its constituent ions. These ions are then free to move in the aqueous solution and carry electric charge, allowing the solution to conduct electricity. Therefore, most ionic compounds can be considered electrolytes when dissolved in water.

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Answer:

0.313 liters

Explanation:

You want to use the Combined Gas Law Equation: (P1*V1)/(n1*T1)=(P2*V2)/(n2*T2). You then want to cross off things that don't change, so moles(n) in this example. Then convert the temperature to Kelvin (always), and solve algebraically.

Answer:

There are 400 meters in a hectometer?

Explanation:

Answer:

there are 400 meters in a hectometer?

Explanation:

Answer:

633.5

Explanation:

The total presser is 650.00 mmHg, and it is collected over water, which at 19c is 16.5 mmHg. Therefore, to get the total pressure of H2 you would subtract the partial pressure of water from the total pressure.

650-16.5=633.5

633.5 mmHg is the pressure of hydrogen gas formed in mmHg.

According to the Dalton's law of partial pressure, the total pressure of a gas mixture is the sum of all the partial pressure of the individual gases present in the mixture of gases.

Hence;

Total pressure = pressure of hydrogen gas + vapour pressure of water

pressure of hydrogen gas = Total pressure - vapour pressure of water

vapour pressure of water at 19°C = 16.5 mmHg

pressure of hydrogen gas =  650.0 mmHg - 16.5 mmHg

pressure hydrogen of gas =  633.5 mmHg

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Answer: The law of conservation of mass states that mass is neither created or destroyed, so the combined mass of all the products after the reaction will be the same as the mass of all the reactants and never more, but since the flask is not closed, the gases produced from the reaction will move into the atmosphere and the product left behind , the solids and/or liquids, will be the only products that you’ll end up weighing, meaning it’ll be less weight than the original reactants. The reason I’m interchanging weight and mass is because although weight changes with gravity, so long as the gravitational force stays constant throughout the experiment, it’s pretty much the same.

Explanation:

Answer:

1.8 mole of S8Explanation:A) 2.5×5=12.5B) 10×1=10C) 4×3=12D) 1.8×8=14.4so d) is correct

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Answer:

11419 J/g/ 11.419 KJ/g

Explanation:

H=MCQ

H=225×2.03×(-15-10)

H=225×2.03(25) Note; negative sign is of no use

H=11419J/g

Answer:

Metallic character of the element

Explanation:

Answer:

The scientific method is the principles and procedures for the systematic pursuit of knowledge involving the recognition and formulation of a problem

Explanation:

Answer:

Appearance: Water is a colourless, odourless and tasteless liquid in its natural state. The crystal structure of water is hexagonal.

Density: The density of water is about 1 gm/cc and it varies with temperature in an undefined pattern. In solid state, the density remains close to 0.9gm/cc.

Viscosity: Viscosity is explained by the resistance to deformation at a given rate. In other words, the thickness of the liquid - eg, syrup or water. Viscosity of water is 0.89 cP.

Explanation:

Phosphoric acid cannot be determined by titration with NaOH using either phenolphthalein or methyl orange indicator because of the presence of multiple dissociation stages in the acid. As a result, the equivalence point cannot be determined accurately.

This is due to the fact that the acid has three dissociation stages. Phosphoric acid (H3PO4) is an example of a polyprotic acid, which means that it has more than one hydrogen ion to donate.

The acid undergoes successive ionization to form H2PO4-, HPO42-, and PO43- ions. The stepwise dissociation reactions are as follows: H3PO4(aq) + H2O(l) → H2PO4-(aq) + H3O+(aq)Ka1 = 7.5 × 10-3H2PO4-(aq) + H2O(l) → HPO42-(aq) + H3O+(aq)Ka2 = 6.2 × 10-8HPO42-(aq) + H2O(l) → PO43-(aq) + H3O+(aq)Ka3 = 4.2 × 10-13

As a result, the pH of the solution after each addition of NaOH will change in a series of steps rather than a single sharp change. As a result, it is impossible to determine the exact equivalence point using either phenolphthalein or methyl orange indicator.

Therefore, it is not possible to determine the amount of phosphoric acid in a solution using the titration method with these indicators.

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Out of the given options, none of the following have the empirical formula CHO.

The empirical formula is the simplest formula for a compound that reflects the ratio of elements present in the compound. It gives the ratio of atoms of different elements in the compound. The empirical formula can be different from the molecular formula.

Lipids are the biomolecules that are composed of carbon, hydrogen, and oxygen (CHO) in a different ratio. They are the esters of fatty acids and glycerol. They are also known as fats or oils. They are the major component of cell membranes. Lipids include fats, phospholipids, and steroids.

Nucleic acids are macromolecules composed of nucleotide units. Nucleotide units consist of a nitrogenous base, a sugar, and a phosphate group. They are the building blocks of DNA and RNA. The empirical formula of nucleic acids is C5H4O2N3P. They contain nitrogen, phosphorus, carbon, oxygen, and hydrogen. They do not have the empirical formula CHO.

Proteins are macromolecules composed of amino acids. They have a complex structure. Proteins are composed of carbon, hydrogen, oxygen, and nitrogen. Some proteins also contain sulfur and phosphorus. Therefore, they do not have the empirical formula CHO. Thus, out of the given options, none of the following have the empirical formula CHO.

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Cesium.

Cesium is said to have the lowest ionization

Answer:

1dg = 10g

1000dg = (1000×10)g

= 1000grams

Explanation:

hope that will help you

Answer: 2.01588

Explanation: 1 mole is equal to 1 moles H2

Answer:

combustion is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.

0.25 moles of sulphur contain 1.506 x 1023 atoms of sulphur, or atoms of S.

Using Avogadro's number, or 6.022 x 1023 atoms per mole, we can determine how many S atoms are contained in 0.25 moles of sulphur. This figure is used to translate the quantity of an element's atoms from moles to atoms.

Here is how to determine how many sulphur atoms there are in 0.25 moles of sulphur:

Find the sulphur (S) molar mass.S has a molecular weight of 32.06 g/mol. This is due to the fact that one mole of sulphur has an atomic mass of 32.06 g/mol.

Thus, by summing the atomic masses of the constituent elements that make up sulphur, we may determine its molar mass. Because there is only one type of sulphur, sulphur (S), its molar mass is 32.06 g/mol, the same as its atomic mass.

Determine how many S atoms are contained in 0.25 moles of sulphur.

Using Avogadro's number, or 6.022 x 1023 atoms per mole, we can determine how many S atoms are contained in 0.25 moles of sulphur. This figure is used to translate the quantity of an element's atoms from moles to atoms.

We can use the following formula to determine how many sulphur atoms there are in 0.25 moles of sulphur: Quantity of atoms = Number of moles of sulfur x Avogadro's number

Replacing the specified values: S has a mass per unit volume of 0.25 mol x 6.022 x 1023 atoms.S has a total of 1.506 x 1023 atoms.

The total number of S atoms in 0.25 moles of sulphur is therefore 1.506 x 1023 atoms.

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The volume of a 25.2 g piece of metal with a density of 8.75 g/cm³ is approximately 2.88 cm³. Density is a measure of how much mass is contained in a given volume.

The formula for density is density = mass/volume. In this case, the mass is given as 25.2 g, and the density is 8.75 g/cm³. To find the volume, we rearrange the formula as volume = mass/density.

Substituting the known values, we get volume = 25.2 g / 8.75 g/cm³. The units of grams in the numerator and denominator cancel out, leaving us with cm³ as the unit for volume. Calculating the division, we find that the volume of the metal is approximately 2.88 cm³.

This means that 25.2 grams of this metal would occupy a volume of 2.88 cubic centimeters.

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The following equations shows the ion formation:

NH₄OH → NH₄⁺ + OH⁻

HNO₃ → H⁺ + NO₃⁻

The formation of an ion involves the process of adding or removing one or more electrons from an atom or molecule, resulting in a charged species.

This can occur through a variety of methods, including chemical reactions, exposure to radiation, or the application of an electric field.

From the above question, we can represent the formation of ions in NH₄OH (ammonium hydroxide) and HNO₃ (nitric acid) by the following equations:

NH₄OH → NH₄⁺ + OH⁻

In this equation, ammonium hydroxide dissociates into ammonium cation (NH₄⁺) and hydroxide anion (OH⁻) ions.

HNO₃ → H⁺ + NO₃⁻

In this equation, nitric acid dissociates into hydrogen cation (H⁺) and nitrate anion (NO₃⁻) ions.

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Answer:

0.02740 moles ZnCl2

0.8777 moles ZnCl2

Explanation:

a) How many moles of ZnCl, can be made from 1.7g of Zn?

First we need to convert from grams of Zn to moles of Zn, and then from moles of Zn to moles of ZnCl.

We will use the atomic weight of Zn to do this..

Atomic weight is 65.38 g Zn/1 mol Zn, this can also be written as

1 mol Zn/65.38mol Zn... We will now convert:

1.76 g Zn *  \(\frac{1 mol Zn}{65.38 g Zn}\) = 0.0273784032 moles Zn

Now we'll use the balanced chemical equation to convert from moles of Zn to moles of ZnCl..

Zn + 2HCl -> ZnCl2 + H2

We can see that for every mol of Zn that reacts, 1 mol of ZnCl2 is produced..

So:

0.0273784032 moles Zn * \(\frac{1 mol ZnCl2}{1 mol Zn}\) = 0.0273784032 moles ZnCl2

This can be estimated to 0.0274 moles ZnCl2

__________________________________________________________

b) If 6.4 grams of HCl are used in this reaction, how many moles of ZnCl, are

produced?

First we need to convert form grams of HCl to moles of HCl, and then to moles of ZnCl...

We'll do this using the atomic weight of HCl (36.458 g/mol or 1 mol/36.458 g)

6.4 g HCl * \(\frac{1 mol HCl}{36.458 g HCl}\) = 0.1755444621 mol HCl

Now we'll use the balanced chemical equation to convert from moles of HCl to moles of ZnCl..

Zn + 2HCl -> ZnCl2 + H2

We can see that for every 2 moles of HCl that react, 1 mol of ZnCl2 is produced..

So:

0.1755444621 mol HCl * \(\frac{1 mol ZnCl2}{2 mol HCl}\) = 0.877722311 moles ZnCl2 are produced.

This can be estimated to 0.8777 moles ZnCl2

Answer:

C

Explanation:

4× CH2 = C4H8

Answer:

When no coefficient is written in front of a formula it is assumed to be 1. 4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.

Explanation:

1. Reactants go on the left hand side and products go on the right hand side of a chemical equation. Be sure to write the correct formulas for the reactants and products.

· Remember atoms are conserved in a chemical reaction. ie they are neither created or destroyed. So all the atoms in the reactants must end up somewhere among the products.

2. Count the number of atoms of each element, compound or ion in the reactants and products. If they are not equal proceed further.

3. Balance the atoms one at a time by placing coefficients in front of the formula so that the numbers of atoms of each element are equal on both sides of the equation. Remember atoms may exist in an element, compound or ion.

· It is usually easier to start with the atoms that occur in only one substance on each side of the equation.

· Balance the atoms that occur in compounds before attempting to balance atoms that occur in elemental form. e.g. H2, O2 or Cl2

· To make it easier if a polyatomic ion appears unchanged on both sides of the equation treat it as a whole unit.

· When no coefficient is written in front of a formula it is assumed to be 1.

4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.

· Remember with subscripts, any number to the right of parentheses multiplies each subscript within the parentheses.

eg Fe2(SO4)3 contains 2 Fe atoms, 3 S atoms and 12 O atoms.

5. Finally make sure that all the coefficients are in the smallest possible whole number ratio.

The number which we will never use as a coefficient in any chemical reactions are decimals and fractions.

Coefficients are the numbers which are written before any chemical entity of any chemical reaction.

Coefficients of any reaction will not be:

Coefficients are generally use for balancing the chemical reactions.

So, we will not use decimals and fractions as a coefficient.

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Answer:

Water changes from liquid to a solid at 32 degrees Fahrenheit

Answer:

32°F

Explanation:

Answer:

anyywhere between 20-23 miles

Explanation:

it depends what type of oil field u mean

15,499 km is Louisville from the nearest oil field. Therefore, option A is correct.

An oil field is defined as a piece of land beneath which fossil fuels can be extracted for economic value. The world's oil is concentrated in oil fields found in the Middle East, along with other large deposits discovered beneath the ocean's surface.

Oil wells are classified into three different categories. Those that exclusively formed oil, those that exclusively formed natural gas and those that formed both oil and natural gas.

Petroleum supplies transportation fuel, is a part of many chemicals and medicines, and is used to create crucial items such as heart valves, contact lenses, and bandages. Oil reserves attract outside investment and are important for improving countries' overall economy.

Thus, 15,499 km is Louisville from the nearest oil field, option A is correct.

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Your question is incomplete, most probably your question was

How far is Louisville from the nearest oil field?​

A.15,499 km

B.15,499 m

C.14,567 km

D.14,567 m

Some scientists suggest we can increase the amount of carbon dioxide removed from the atmosphere by adding iron to stimulate productivity in tropical oceans.

Iron fertilization is a proposed geoengineering technique that involves adding iron to nutrient-depleted ocean regions to stimulate the growth of phytoplankton. Phytoplankton are photosynthetic microorganisms that play a crucial role in carbon dioxide uptake through photosynthesis. They consume carbon dioxide during photosynthesis and can sequester carbon in the deep ocean when they die and sink.

Iron is a vital micronutrient for phytoplankton growth, and in some areas, its availability limits their productivity. By adding iron to these iron-limited regions, scientists hypothesize that it can enhance the growth of phytoplankton, leading to increased carbon dioxide uptake from the atmosphere. The idea behind this approach is that the stimulated phytoplankton would take up more carbon dioxide through photosynthesis, and when they die and sink, they would carry the carbon to the deep ocean, effectively removing it from the atmosphere for an extended period. However, the effectiveness and potential environmental impacts of iron fertilization are still areas of ongoing research and debate.

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Answer:

Reduce high-pressure gas in the scuba cylinder to ambient (surrounding) pressure.

Explanation:

The primary function of a scuba regulator would be to reduce high-pressure gas in the scuba cylinder to ambient pressure.

A scuba regulator is a structure found attached to the scuba cylinder usually carried by scuba divers. The structure regulates the pressure of the breathing gas in the cylinder to a safe level before the gas becomes available for the breathing process of divers.

Usually, the gas in a scuba cylinder is at a high level. Hence, what the regulator does is to bring it down to a level that would be safe for the breathing of the diver.

Answer:

True hope this helps

Explanation: