HELP ME CHEMISTRY QUESTION PURE SUBSTANCE OR MIXTURE 100 POINTS

The difference as required in the question to the correct number of significant figures is 147 in units of millimeter.

Let us take note of the fact that the term significant figures has to do with the number of figures that could be assigned a place value. This is the number of figures that we could be able to give the corresponding value.

Now we can see that one of the numbers have four significant figures and the other number has only about three significant figures. The result that we obtain must be such that has three significant figures.

It the follows that the result of the computation is; 147.6 - 0.82 = 147 in units of millimeter.

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I believe the answer is B, neutrons

0.5 mL of serum with 1/20 dilution will be equivalent to 10 mL of the diluted serum.

A 1/20 dilution means 1 part of the original solution and 19 parts of the solvent that is being used to dilute.

Now, a 1/20 dilution of a 0.5 mL serum means that the 1 part of the stock solution is 0.5 mL. The remaining 19 parts would be in multiples of 0.5 mL.

         19 x 0.5 = 9.5 mL.

This means that 9.5 mL of the diluting solvent will be added to 0.5 mL of the stock solution resulting in a total of 10 mL.

In order words, 1/20 dilution of 0.5 mL of serum will make a total volume of 10 mL.

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Answer: O2 is the reducing agent

Explanation: When you are adding oxygen, you are oxidizing.  So O2 is the reducing agent because Aluminum  loses electrons and becomes positive in charge and O2 gains electrons and becomes negative in charge.  Aluminum is oxidized and oxygen is reduced, therefore the oxygen is the reducing agent.  Remember oxidation cannot occur in isolation.  There is another process going on when something is oxidized and that process is reduction.    

The balanced equation is:

Zn + 2HCl ---> ZnCl2 + H2

The reaction that is chemically balanced and shows complete combustion is [tex]C_3 H_8 + 5 O_2 -- > 3 CO_2 + 4 H_2 O[/tex], Option B.

A balanced equation is an equation that obeys the law of conservation of atoms.

According to this law, atoms cannot be created and cannot be destroyed during the course of chemical reactions. The atoms can, however, be converted into different forms.

Thus, a balanced equation must have an equal number of participating atoms on both the reactant and product sides of the equation.

Also, a complete combustion reaction must produce carbon dioxide and water. Not carbon monoxide.

Therefore, the equation that fulfills the two conditions is[tex]C_3 H_8 + 5 O_2 -- > 3 CO_2 + 4 H_2 O[/tex]

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Answer:

C

Explanation:

I got it right

The relative atomic mass of the rubidium atom could be calculated from the data provided as 85.46.

When we talk about an isotope, we are referring to the idea that we could have tow or more atoms of the same element that have the same atomic number but do not have the same mass number. Given that the atomic number is the number of protons, it then follows that the two elements as we know them does differ only in the number of the neutrons that they have. The atoms that we have thus described in the several lines above are other wise called the isotopes of the element. We have in the image of the question a clear example of what an isotope is and we now want to find the relative atomic mass of Rubidium.

The relative atomic mass can be obtained from the use of the formula;

(84.9118 * 72.2/100) + (86.9092 * 27.8/100)

= (61.30 + 24.16)

= 85.46

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A standard electrode potential is required in order to determine the reduction potential of a half-unique cell. The standard hydrogen electrode is used as a reference electrode for the measurement

A standard electrode potential is required in order to determine the reduction potential of a half-unique cell. The standard hydrogen electrode is used as a reference electrode for the measurement (abbreviated to SHE). SHE has an electrode potential of zero volts.

By deducting the standard reduction potential for the reaction occurring at the cathode from the standard reduction potential for the reaction occurring at the anode, the standard reduction potential can be computed. Because oxidation is the polar opposite of reduction, the minus sign is required.

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In given ionic compound, Mg(ClO4)2 anion is ClO4⁻, NH4NO³ anion is (NO3)⁻, Cu(CH3CO2)² anion is [CH3COO]⁻, K2SO³ anion is SO3²⁻.

Positively charged ions are known as cations. Ions with negative charges are referred to as anions. A charged molecule or an atom is an ion. A balanced atom will change into a positively charged cation if one or more of its electrons are lost.

When non-metals gain electrons, they are created. They don't lose any protons and gain one or more electrons. They get a negative net charge as a result. The anions iodide (I-), chloride (Cl-), and hydroxide are some examples (OH–).

Anion exchange device applications. They lower the levels of nitrate, arsenic, and sulfate in water. Point-of-use units only filter harmful chemicals out of drinking and cooking water and are connected to a single tap.

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The characteristic of group 14 elements is that they have four valence electrons in their outermost shell.

This is referred to as a substance which can't be broken down into simpler substances through as chemical reaction and examples include hydrogen, calcium etc.

These elements are arranged into different groups and periods on a periodic table according to their similarities. For example group 14 elements have four valence electrons which they need to complete in other to achieve a stable configuration.

Example of group 14 elements are carbon,silicon, tin etc which form covalent bonds with other elements in a reaction so as to ensure that that both become stable and is therefore the reason why it was chosen as the most appropriate choice.

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The  frequency of light is the ratio of speed to the wavelength. Then, the frequency of range light with the wavelength of 605 nm is 4.95 × 10¹⁴ Hz.

Frequency of light refers to the number of waves of electromagnetic radiation (such as light) that pass a given point per second. It is typically measured in Hertz (Hz), which represents the number of cycles per second.

The frequency of light determines its color and is directly related to its energy. Light with higher frequency has more energy and shorter wavelengths, while light with lower frequency has less energy and longer wavelengths.

Speed of light = 3 × 10⁸ m/s

wavelength = 605 nm = 605 × 10⁻⁹ m.

then frequency =  3 × 10⁸ m/s / 3 × 10⁸ m/s = 4.95 × 10¹⁴ Hz

Therefore, the frequency of the orange light is 4.95 × 10¹⁴ Hz.

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The balanced equation of the reaction is:

Balanced equations are equations in which the moles of atoms on the right-hand side of the equation are equal to the moles of atoms on the left-hand side of the equation.

Balanced equations ensure that the law of the conservation of mass is obeyed such that the mass of reactants is equal to the mass of the products.

In balancing a chemical equation, the following steps are followed:

Considering the given reaction:

In the reaction, methane gas reacts with chlorine gas to produce tetrachloromethane and hydrogen chloride gas.

The balanced equation of the reaction is given below as follows:

CH₄ (g) + 4 Cl₂ (g) ---> CCl₄ (l) + 4 HCl (g)

The reaction is a substitution reaction in which chlorine atoms substitute hydrogen atoms in the methane gas molecule.

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INFORMATION:

We know that:

- the diagram represents a chemical cell at 298 K

And we must determine how is the flow of electrons when the switch is closed

STEP BY STEP EXPLANATION:

To determine it, we need to know that the flow of electron will be from the particles undergo oxidation to particles undergo reduction.

Analyzing the equation, we can see that Al particles undergo oxidation and Ni particles undergo reduction

Then, electrons will flow from Al(s) to Ni(s)

ANSWER:

(3) Al(s) to Ni(s)

According to the research, the correct answer is All atoms of a given element must have the same number of protons, neutrons, and electrons. It is the statement about atoms that is NOT correct.

It is a particle that consists of a central nucleus, positively charged with protons and neutrons, in which practically all the mass of the atom is concentrated.

In this sense, in the outer zone are the electrons, which occupy orbits, whose number varies according to the chemical element, also in a given element it can have a different number of neutrons.

Therefore, we can conclude that atoms are distinguished from each other thanks to the configuration of their particles, it is also true that all atoms of the same element are exactly the same, where the number of neutrons can vary.

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The  observation of this process that  provides evidence of a chemical reaction is "The liquid solution changed color" Option B

This is further explained below.

Generally, A chemical reaction is a process in which one or more compounds, referred to as the reactants, are changed into one or more new substances, referred to as the products.

Either the chemical components or the chemical compounds make up a substance.

During a chemical reaction, the individual atoms that make up the reactants are rearranged, which results in the production of new substances.

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CQ

A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove that tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction? *

A- Hot water heated the aluminum foil

B- The liquid solution changed color

C- The pan was lined with aluminum foil

D- The hot water cooled

According to the given statement The empirical formula of the oxide is YO3.

Chemical formulae for compounds that simply specify the proportions of the elements they include rather than the exact number or arrangement of atoms are known as empirical formulas. The component in the compound with the lowest whole lot would be this one.

By: Calculating the number of moles of each element from its mass, empirical formulas are generated using empirically measured element masses. Obtaining subscripts for a possible empirical formula by dividing the molar amount of each element by its smallest molar amount.

Since volume is represented as moles

Y 0

1 1.5

Y+1.5O2 = YO3.

YO3 - the empirical formula.

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Answer: Potential energy.

Explanation: Potential energy is stored energy and the energy of position.

0.9541 grams of nickel (ii) hydroxide will be produced if 30.4 mL of 0.673 M KOH react completely and 1.3764 grams of nickel (ii) hydroxide will be produced if the 17.6 mL of 0.841 M NiCl₂ react completely.

According to the balanced chemical equation,

2KOH (aq) + NiCl₂ (aq) → 2 KCI (aq) + Ni(OH)₂ (S)

a. 2 Moles of KOH = one mole of Ni(OH).

As we know,

Molarity = moles/amount of solution(in liters)

For KOH,

0.675 = moles/0.0304

Moles of KOH = 0.02052.

Moles of Ni(OH) = 0.02052/2

Moles of Ni(OH) = 0.01026

We also know,

Moles = formed mass/molar mass

Molar mass of NiOH = 93 grams/mole

0.01026 = formed mass/93

Formed mass of NiOH = 0.9541 grams.

b. 1 Mole of NiCl₂ = one mole of Ni(OH).

As we know,

Molarity = moles/amount of solution(in liters)

For NiCl₂,

0.841 = moles/0.0176

Moles of NiCl₂ = 0.01480

Moles of Ni(OH) = 0.01480

We also know,

Moles = formed mass/molar mass

Molar mass of NiOH = 93 grams/mole

0.01480 = formed mass/93

Formed mass of NiOH = 1.3764 grams.

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Answer:

A. Ar+2

B. 18

C. 0

Explanation:

There are total of 2 + 2 + 6 + 2 + 4 = 16 electrons

since the cation is +2, it's neutral state should be 16 + 2 = 18

A. The ion is Ar+2

B. 18

C. Since 3p => 4s => 3d, there is no 3d

2509 in 3 significant figures is 2510.

Significant figures is a digit that is meaningful with respect to the precision of a measurement.

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.

We can identify the number of significant digits by counting all the values starting from the 1st non-zero digit located on the left. For example, 12.45 has four significant digits.

According to this question, 2509 contains 4 significant figures.

2509 is rounded to significant figures as follows:

To count the number of sig figs in 2509, count all 4 digits since it has no insignificant digits.

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Answer:

look that might be answer

Explanation:

To determine the level of radionuclides present is the best reason for consulting with a nuclear chemist before building the processing plant.

The level of radionuclides refers to the concentration in the atmosphere of radioactive compounds, which may be harmful to humans and therefore theirs levels should be monitored in order to maintain well being, especially in nuclear plants where they can be dangerous to the environment.

Therefore, we can conclude that it is required to know the level of radionuclides that are present in a processing plant.

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Answer:a

Explanation:

Answer:Ca(No3)2

Explanation:

The balanced chemical equation of the chemical reaction of hydrogen and oxygen is:

2 H₂ (g)  + O₂ (g)  →  2H₂O (l)

A balanced chemical equation is an equation in which the number of atoms of each element on the left side of the arrow (reactant side) is equal to the number of atoms of each element on the right side (product side) of the arrow.

A chemical equation is a way to express the chemical reaction in terms of symbols of the substances. It is very important that a balanced chemical equation must obey the law of conservation of mass.

By following the law, the total mass of the elements left side or reactant side should be equal to the total mass of elements on the right side (product side) in a balanced chemical equation.

Given, the chemical reaction of the water formation is as follows:

H₂ (g)  + O₂ (g)  →  2H₂O (l)

The number of oxygen on both sides is equal but the number of hydrogens is unequal. So multiply the hydrogen gas on the left side by 2.

So the balanced chemical equation of water formation becomes:

2 H₂ (g)  + O₂ (g)  →  2H₂O (l)

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The energy required to ionize a hydrogen atom from the n = 3 energy level is  2.422 x 10 ⁻¹⁹J.

in the given question ,

The ionization energy can be expressed as follows:

E = 2.18 x 10 ⁻¹⁸ (1/n₁² - 1/∞²)

given , n = 3

E = 2.18 x 10 ⁻¹⁸ (1/3² - 1/∞²)

E = (2.18 x 10 ⁻¹⁸) / 9

E = 2.422 x 10 ⁻¹⁹

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Ionization energy is the minimum energy required to remove an electron from an isolated atom in the gaseous state, that is, in its ground state.

At the periodic table, we can see that there is a pattern for the first ionization energy.

It increases from bottom to top in a group, and from left to right in a period.

So:

Argon and Helium are on the far right of the periodic table, while sodium and potassium are on the far left.

So Argon and Helium have the highest ionization energy in comparison to Potassium and Sodium.

Between Argon and Helium, Helium is above argon in the periodic table, this means that helium has the highest ionization energy.

Answer: Helium

The balanced net ionic equation for the reaction is given below:

Pb²⁺ (aq) + S²⁻ (aq) → PbS (s)

Ionic equations are equations that show the ionic species involved i a reaction.

The ionic species in the reaction may undergo reduction or oxidation.

Therefore, ionic equations are usually redox reactions.

In balancing ionic equations, the atoms and the electrons involved in the reaction are balanced on both sides.

Considering the given ionic equation:

Pb²⁺ (aq) + S²⁻ (aq) → PbS (s)

The given equation above is a balanced net ionic equation both in electron transfer as well as in the number of atoms.

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Considering the definition of atomic mass, isotopes and atomic mass of an element, the relative atomic mass for pivotium is 418.32 amu.

The isotopes of an element are those different atoms that make up an element, that is, their atomic numbers are the same, but the number of neutrons is different.

The atomic mass of an element is the weighted average mass of its natural isotopes, taking into account the relative abundance of each of them.

In this case, you know:

The average mass of pivotium can be calculated as:

average mass of pivotium= 423 amu×0.22 + 417 amu×0.78

average mass of pivotium= 418.32 amu

Finally, the atomic mass of the pivotium is 418.32 amu.

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