An electric current of 1.00 ampere is passed through an aqueous solution of Ni(NO3)2. How long will it take to plate out exactly 1.00 mol of nickel metal, assuming 100 percent current efficiency? (1 Faraday = 96,500 coulombs = 6.02 x 1023 electrons). multiple choice: 386,000 sec
193,000 sec
96,500 sec
48,200 sec
24,100 sec

halogens have 7

allali have 2

noble gases have 8

K = 1

P = -3

Ra= 7

Cl = -1

N = 5

O = 6

Answer:

a positive and negative ion

Explanation:

An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.

Answer:

A positive and negative Ion. I took the test!

Explanation:

An ionic bond occurs between what particles?

two negative ions

a positive and negative ion

two neutral atoms

two positive ions

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:

it's A) or E)

others are not suitable cuz their melting point is weak.

Answer:

Gallium

Explanation:

Because the melting point is low and the drinks are usually around 60-70 degrees Celsius so it wil melt

The names for the given compounds:(a) [Cu(NH3)4]SO4 - Tetraamminecopper(II) sulfate, (b) Na[AlCl4] - Sodium tetrachloroaluminate, (c) Mo(CO)6 - Molybdenum hexacarbonyl, (d) [Ni(bipy)3](NO3)2 - Tris(bipyridine)nickel(II) nitrate
(e) K3[Fe(CN)6] - Potassium hexacyanoferrate(III)

(a) [Cu(NH3)4]SO4 is known as tetraamminecopper(II) sulfate. It is a coordination compound in which copper(II) ion is coordinated with four ammonia molecules and one sulfate ion.

(b) Na[AlCl4] is called sodium tetrahaloaluminate(III). It is a salt that contains an AlCl4- ion, which is a tetrahedral complex anion formed by coordinating one aluminum ion with four chloride ions.

(c) Mo(CO)6 is known as molybdenum hexacarbonyl. It is a metal carbonyl compound that is used as a precursor for the synthesis of other molybdenum compounds.

(d) [Ni(bipy)3](NO3)2 is called tris(bipyridine)nickel(II) nitrate. It is a coordination compound in which nickel(II) ion is coordinated with three bipyridine ligands.

(e) K3[Fe(CN)6] is known as potassium hexacyanoferrate(III). It is a coordination compound in which iron(III) ion is coordinated with six cyanide ions. The compound is commonly used as a source of the Fe3+ ion in laboratory experiments.

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Answer:

Heat of combustion- the heat released when one mole of a substance is completely burned. In this case, one mole of oxygen reacts with one mole of methanol to form one mole of carbon dioxide and two moles of water. ... By measuring the temperature change, the heat of combustion can be determined.

Reactivity-  reactivity is the impetus for which a chemical substance undergoes a chemical reaction, either by itself or with other materials, with an overall release of energy

Strength - The strength of an acid is a measure of the degree of ionization in an aqueous solution. The greater the number of ions dissociated, or the number of cations and anions released in solution, the stronger the acid

Solubility- Solubility is the property of a solid, liquid or gaseous chemical substance called solute to dissolve in a solid, liquid or gaseous solvent.

Viscosity-  describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.

Explanation:

Answer:

Optical Atomic Spectroscopy

Explanation:

...

The kind of spectra used to measure the atomic number of elements is X-ray spectra.

The atomic number of elements is the number of protons in the nucleus of the element. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.

In 1913, Mosely demonstrated that the atomic number of elements can be obtained from the X-ray spectra of elements. Using this method, he arranged the elements in order of increasing atomic number.

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Answer:

Pencil is an element and a heterogeneous mixture

Explanation:

There are various kind of elements that are present in periodic table. Some elements are metals, some are non metals, some are metalloids. Therefore, the correct options are option A, C, D.

Metals are those elements which is found on the extreme left of the periodic table.

1.Since metals have free electrons that's why they can conduct electricity

2. Since atoms in metals are very closely packed in a definite crystal solid. Metal  is not brittle that is it can not be broken down easily

3. Metal does not react with water.

4.Metal is denser than water hence it sink in water.

5. Metals are malleable, ductile and lustrous.

6. Metals have high melting and boiling point.

Therefore, the correct options are option A, C, D.

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Answer:

Closed-toe shoes, long pants, a lab coat, safety glasses with side shields or splash goggles, and gloves.

Explanation:

Answer:

The answer is "The first choice".

Explanation:

The single moving process is defined as its reaction where very describe events in its chemical process substitutes much fewer activities shall. Able to follow was its chemical formula with a displacement reaction:  

\(\to \bold{B+ XC \longrightarrow BX +C }\)

In this, the element value of A more sensitive than element C.  

Nonmetals are also the components which generate electrodes and achieve a negatively charged named anions.  

As for chemistry response:

\(\to \text{ Non-metal + Ionic compound} \longrightarrow \text{Non-metal + Ionic compound}\)

As there is no metal from either reactant side, ions are therefore unique throughout the chemical process.  

For example, sodium due to temperature's response is accompanied by the following equation:  

It's a correct answer, because "It is a single substitution reaction, and the anions are different in both ion compounds".

Answer:

volume

Explanation:

Answer:

How does an organisms DNA determine it's chances of survival:

Organisms with heritable (genetically determined) features that help them survive and reproduce in a particular environment tend to leave more offspring than their peers. If this continues over generations, the heritable features that aid survival and reproduction will become more and more common in the population

How does humans manipulate DNA of organisms to be benefit themselves:

Biotechnology is the use of biological techniques and engineered organisms to make products or plants and animals that have desired traits.

The survival of an organism can be determined from its DNA, by checking any chances of mutation in its genetic codes. Humans manipulate DNA of organisms to create traits of greater survival and desired characteristics.

DNA or deoxyribose nucleic acid is a genetic material in all living bodies and are considered to be the building blocks of life. Genes are the basic of life and each genes are coded in a specific manner in each organisms.

The gene sequence have to be perfect in organism to make it the fittest to survive. The DNA sequence of different organism can be studies and any mutation that is wrong sequencing can be identified.

If any mutation is present, the organism cannot survive.  DNA of one organism can be inserted into other one to get the characteristics of the first one through advanced research designs.

Therefore, humans manipulate DNAs of various organisms to change study how to change the characteristics and to get it in a desired way.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

Physical science

Life science

Explanation:

Answer:

1. Mass of the blue ball is 5 kg.

2. Mass of the red ball is 3.75 kg.

Explanation:

The following data were obtained from the question:

For the blue ball:

Force (F) = 15 N

Acceleration (a) = 3 m/s²

Mass (m) =.?

Force the red ball:

Force (F) = the same with that of the blue ball = 15 N

Acceleration (a) = 4 m/s²

Mass (m) =.?

1. Determination of the mass of the blue ball.

Force (F) = 15 N

Acceleration (a) = 3 m/s²

Mass (m) =.?

Force (F) = mass (m) × acceleration (a)

F = ma

15 = m × 3

Divide both side by 3

m = 15/3

m = 5 kg

Therefore, the mass of the blue ball is 5 kg

2. Determination of the mass of the red ball.

Force (F) = 15 N

Acceleration (a) = 4 m/s²

Mass (m) =.?

Force (F) = mass (m) × acceleration (a)

F = ma

15 = m × 4

Divide both side by 4

m = 15/4

m = 3.75 kg

Therefore, the mass of the blue ball is 3.75 kg

Formula

\(\ell=\frac{n h}{2 \pi}\)

\(\ell = angular \: momentum\)

\(n = principal quantum number \\ h = Planck's constant \\ \pi = pi\)

Answer:

a. The limiting reagent is NO2.

b. 126g of nitric acid can be produced.

Explanation:

1st) It is necessary to write the balanced equation:

From the balanced equation we know that 3 moles of NO2 (3x46g= 138g) react with 1 mol of water (18g/mol) to produce 2 moles of nitric acid (2x63g= 126g) and 1 mol of NO (30g/mol).

2nd) To calculate the limiting reagent it is necessary to use the given values and the stoichiometry of the balanced equation:

The 10.0g of NO2 will need 1.30g of H2O to react.

The 30.0g of H2O will need 230g of NO2 to react.

So, as we only have 10.0g of NO2 and 30.0g of H2O, the limiting reagent will be NO2.

3rd) Now, to calculate the theorical yield, we need to use the stoichiometry of the balanced equation using the limiting reagent:

1 mol of H2O produces 2 moles of nitric acid. With the molar mass of nitric acid (63g/mol), we can calculate the grams.

Finally, 126g of nitric acid will be produced if the reaction is 100% efficient (theoretical yield).

The catalyst will increase the rate of the reaction.

The addition of a catalyst to the reaction at equilibrium: A(g) + B(g) <-> C(g) + D(g) will have no effect on the position of equilibrium. A catalyst is a substance that increases the rate of a chemical reaction by providing an alternative reaction pathway with a lower activation energy. It achieves this by facilitating the conversion of reactants into products and promoting the reverse conversion of products back into reactants. However, a catalyst does not affect the thermodynamics of the reaction, including the equilibrium position.

At equilibrium, the forward and reverse reactions are occurring at the same rate, resulting in a constant concentration of each species. The addition of a catalyst does not alter the relative concentrations of the reactants and products at equilibrium. Instead, it speeds up the attainment of equilibrium by accelerating the rates of the forward and reverse reactions equally.

Therefore, the addition of a catalyst to the equilibrium reaction A(g) + B(g) <-> C(g) + D(g) will increase the rate at which equilibrium is reached but will not shift the position of the equilibrium. The concentrations of A, B, C, and D at equilibrium will remain unaffected.

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The acid hydrogen chloride(HCl) could be used to prepare dry crystals of salt cobalt(II) chloride-6-water from the insoluble base cobalt(II) carbonate.

Equation of the reaction:

cobalt(II) carbonate + Hydrogen chloride => cobalt(II) chloride + Hydrogen-carbonate

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a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.

b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.

c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.

d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.

a) Melting:  Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.

b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.

c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.

d) Evaporation:  As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.

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Explanation:

The balanced equation for the reaction is:

2 O + Ca → Compound

From the information given, we know that 2.0 moles of oxygen atoms reacts with 80.1 g of calcium. To find the percent composition by mass of each element in the new compound, we first need to determine the molar mass of the compound.

The molar mass of the compound can be calculated by adding up the molar masses of oxygen and calcium.

Molar mass of O = 2 x (16.00 g/mol) = 32.00 g/mol

Molar mass of Ca = 40.08 g/mol

Molar mass of Compound = 32.00 g/mol + 40.08 g/mol = 72.08 g/mol

Now we can use this information to find the percent composition by mass of each element in the compound.

% mass of O = (moles of O x molar mass of O) / molar mass of Compound x 100

% mass of O = (2.0 moles x 32.00 g/mol) / 72.08 g/mol x 100 = 44.68%

% mass of Ca = (moles of Ca x molar mass of Ca) / molar mass of Compound x 100

% mass of Ca = (80.1 g / 40.08 g/mol) / 72.08 g/mol x 100 = 55.32%

So, the percent composition by mass of oxygen in the new compound is 44.68% and the percent composition by mass of calcium in the new compound is 55.32%

Answer:

The purpose of a Bohr model is to show the atom(s) as a central nucleus; containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus.

Explanation:

Have a great rest of your day
The one and only,
-Mr. Universe

In 1913 Bohr proposed his model of the atom , it's purpose was to explain how electrons can have stable orbits around the nucleus. It shows electrons orbiting the nucleus of an atom -He found that electrons farther away from the nucleus have more energy, meaning the electrons that are closer to the nucleus have less energy.

For example...(shows  Bromine )

(you can give that gentleman up top brainliest)

The total atmospheric pressure of the final product in the flask is 18.36atm

Atmospheric pressure can be defined as the force exerted on a surface by the air above it as gravity pulls it to earth.

Furthermore, the standard atmosphere is a unit of pressure which is also defined as:

101,325 Pa =760mmHg

So therefore, the total pressure of the final product in the flask is 18.36atm

Complete question:

Gaseous iodine pentafluoride, IF₅, can be prepared by the reaction of solid iodine and gaseous fluorine:

I₂(s) + 5F₂(g) → 2IF₅(g)

A 10.00 L flask is charged with 19.0 grams of I₂ and 2.00 atm of F₂ at 25°C. The flask is heated to 100°C until one of the reagents is completely consumed. What will be the total pressure (in atm) of the final products in the flask at 100°C? (Assume ideal gas behavior)

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Answer:

4.97097

Explanation:

You traveled 4.97097 mph.

Answer: Molality of a saline solution = 1.14 moles per kg

Explanation:

Given mass of NaCl (m)= 50.0 g

Mass of solvent = 0.750 kg

Molar mass of NaCl (M)= 23 g + 35.5 g = 58.5g  [Atomic mass of Na = 23 u , atomic mass of Cl = 35.5 u]

Number of moles (n) =\(\dfrac{m}{M}\)

\(\dfrac{50}{58.5}=.8547\)

Molality = \(\dfrac{\text{Number of moles }}{\text{Mass of solvent in kg}}\)

\(=\dfrac{0.8547}{0.750}=1.1396\approx1.14\text{ moles per kg]\)

Hence, molality of a saline solution = 1.14 moles per kg