Which elements would form metallic bonds?
Select all correct answers.
iridium
cadmium
iron
chlorine

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 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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Answer:

What is matter? Matter is everything around you. Atoms and compounds are all made of very small parts of matter. Those atoms go on to build the things you see and touch every day. Matter is defined as anything that has mass and takes up space (it has volume).

What is mass? Mass is the amount of matter in an object. You might have a small object with a lot of mass such as a statue made of lead (Pb). You might have a large object with very little mass such as a balloon filled with helium (He). You should also know there is a difference between mass and weight. Mass is a measure of the matter in an object while weight is a measure of gravity’s pull on an object.

In physics, a state of matter is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma. Many intermediate states are known to exist, such as liquid crystal, and some states only exist under extreme conditions, such as Bose–Einstein condensates (in extreme cold), neutron-degenerate matter (in extreme density), and quark–gluon plasma (at extremely high energy). For a complete list of all exotic states of matter, see the list of states of matter.

Historically, the distinction is made based on qualitative differences in properties. Matter in the solid state maintains a fixed volume and shape, with component particles (atoms, molecules or ions) close together and fixed into place. Matter in the liquid state maintains a fixed volume, but has a variable shape that adapts to fit its container. Its particles are still close together but move freely. Matter in the gaseous state has both variable volume and shape, adapting both to fit its container. Its particles are neither close together nor fixed in place. Matter in the plasma state has variable volume and shape, and contains neutral atoms as well as a significant number of ions and electrons, both of which can move around freely.

Explanation:

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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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 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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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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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 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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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.

103 Neutrons. You take the Mass rounded and subtract it with the atomic #

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 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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The kinetic theory of matter states that all matter is made up of minute particles with space in between them that move randomly. The theory is based on the fact that matter is composed of small particles.

Based on the atoms of an ideal gas, KMT has five hypotheses:

1. Gases are made up of several molecules moving randomly and constantly in linear motion.

2. The volume of all the molecules is dwarfed by the volume of the gas as a whole.

3. Intermolecular forces are negligible.

4. The average kinetic energy of every molecule in the gas stays constant as long as the temperature stays constant. Molecular collisions are therefore entirely elastic.

5. The average kinetic energy of all molecules in a gas depends on its absolute temperature. This shows that at any temperature, gas molecules in equilibrium have the same average kinetic energy (but NOT the same velocity and mass).

The kinetic-molecular theory, a theory that characterizes the states of matter, is based on the presumption that matter is composed of small particles that are constantly in motion. The theory clarifies observed properties and behaviors of gases, liquids, and solids.

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A physical change is a change from one state of matter to another; a chemical change results in the formation of a new substance.

Examples of physical changes include changes in the composition or size of materials. Physical changes include changes from one state to another, for as going from a solid to a liquid or a liquid to a gas. Some of the processes that result in physical changes are cutting, bending, dissolving, freezing, boiling, and melting.

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Zinc has work function (Φ) of 4.3 eV. The longest wavelength of the light is 2.885nm.

In solid-state physics, work function (sometimes spelled work function) is the minimum thermodynamic work (i.e., energy) needed to remove an electron from a solid to a point in the vacuum immediately outside the solid surface. Here "immediately" means that the final electron position is far from the surface on atomic scale, but still too close to the solid to be influenced by ambient electric fields in the vacuum.

The work function is not a characteristic of a bulk material, but rather a property of the surface of material (depending on crystal face and contamination).

The work function refers to removal of an electron to a position that is far enough from the surface (many nm) that the force between electron and its image charge in the surface can be neglected. The electron must also be close to the surface compared to the nearest edge of a crystal facet, or to any other change in surface structure, such as a change in material composition, surface coating or reconstruction. The built-in electric field that results from these structures, and any other ambient electric field present in vacuum, are excluded in defining the work function.

From the question we are told that,

The work function of Zinc is  [tex]W=4.3eV[/tex]

Generally, work function can be mathematically represented as

[tex]E_{o} = \frac{hc}{ λ long}[/tex]

⇒[tex]λ long=\frac{hc}{E_{o} }[/tex]

Here  h is Planck constant with the value h= [tex]4.1357*10^{-15} eV[/tex]*

and c is the speed of the light with value  c= [tex]3.0*10^{8}m/s[/tex]

So,

⇒λ[tex]_{long}[/tex] = [tex]\frac{4.1357*10^{-15}*3*10^{8} }{4.3}[/tex]

       = [tex]2.885*10^{-7}[/tex]m

        = 2.885nm

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Scientific experimentation to provide the basis for scientific knowledge

A scientific experiment is any process in which measurements are used and tests are carried out to verify or refute a hypothesis and the hypothesis is a proposition that appears to be true, but has not yet been corroborated, and from which an investigation can be developed and experiment plays many roles in science and one of its important roles is to test theories and to provide the basis for scientific knowledge and it can also call for a new theory, either by showing that an accepted theory is incorrect, or by exhibiting a new phenomenon that is in need

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Answer:

93.7 feet

Explanation:

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

Hope this helped! :)

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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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.

Radioisotopes like Chlorine-36 is used for dating groundwater, Uranium-238 is used for analyzing rocks, Carbon-14 is used for dating bones whereas Cobalt-60 is used in killing cancerous cells.

The radionuclides of a heavy element are known as radioisotopes. They are atoms that have an unstable mix of protons and neutrons. In their nucleus, there is excess energy.

Some elements could have one or more unstable isotopes. These unstable isotopes cause gamma rays and the Alpha particles they release to decay.

Radioactive isotopes or radioisotopes are isotopes that are unstable owing to the presence of additional neutrons in their nuclei and produce different forms of radiation.

For instance: Uranium-238, Cobalt-60, Carbon-14, and Chlorine-36

Use of Radioisotopes:

(i) Cancer patients receive therapy using them.

(ii) They are used to evaluate rock formations

(iii) To date groundwater

(iv) To date bones

(v) Medical professionals utilize radioactive isotopes as "tracers" to find malignancies and blood clots in patients.

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Answer:

Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy

We can predict formula of ionic compounds by:

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

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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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