Scientists in a lab are working with two different samples of the element mercury. They know that the different samples are different isotopes.

Which property of the isotopes must be different?
a. the atomic number
b. the electric charge
c. the element name
d. the mass number

b

.................,

......

Answer:

Its [H+] and [OH-] are the same.

Explanation:

i just took the test and got it right

The supplied statement states that carbon tetrachloride (ccl4) is a nonpolar solvent and water (h2o) is a polar solvent.

Solvent Case Studies. The usual examples of solvents are acetone, ethanol, water, and methanol. A chemical that has the capacity to breakdown a certain solute and combine with it to produce a solution is referred to as a "solvent."

There are two different kinds of solvents: organic and inorganic. Carbon doesn't exist in inorganic liquids. Water and pure ammonium are the most popular inorganic liquids, but solvents like alcohols and glycol ethers have carbon and oxygen as structural constituents.

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After evaluating perfect square binomial, the expression "(a + b)² = a² + b²" is False.

A numerical data is also referred to as a quantitative data and it can be defined as a data set that is primarily expressed in numbers only. This ultimately implies that, a numerical data refers to a data set consisting of numbers rather than words.

In Mathematics, there are six (6) common types of numbers and these include the following:

An integer can be defined as a whole number that may either be positive, negative, or zero.

Evaluating the given perfect square binomial, we have:

(a + b)² = (a + b)(a + b)

(a + b)² = a² + ab + ab + b²

(a + b)² = a² + 2ab + b² ≠ a² + b² (False).

Therefore, we can logically deduce that the expression "(a + b)² = a² + b²" is False.

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Complete Question:

True or False: For any two integers a and b, (a + b)² = a² + b²

Answer:

density because it S.I unit is derived from fundamentals

Aluminum hydroxide will breakdown in a sodium hydroxides solution because the [Al(OH)4] ion, a basic ion which is soluble in water, will develop as a result of the excess hydroxide.

In chemistry, a solution is a homogeneous combination of two or more compounds in their relative proportions, which may be constantly changed up to what is known as the limitation of solubility. Although combinations of gas and solids are possible, the term "solution" was mostly frequently used to refer to the liquid condition of matter.

When a solvent and just a solute, several chemicals, are combined, they form a solution. A solution is generated when a molecule and a solvents are combined.

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Answer:

10mm2

Explanation:

I did the test on edg too lol

The solute with a surface area of 10 mm² will dissolve the quickest.

Solubility can be described as the maximum amount of a substance that will dissolve in a given solvent at a temperature. The effects of temperature on solubility can be seen in both solids and gases but the pressure effect is related to the solubility of gases. Surface area is a factor in how slowly or quickly the saturation point will be reached.

The rate of solubility is affected by the surface area of a solid. If we were to increase the surface area of a solute then increase how quickly the solute would dissolve in solution. Even the maximum solubility can be achieved more quickly with greater surface area.

Increasing the surface area will increase the rate of solubility of a solute therefore solute with a surface area of 10 mm² will dissolve the quickest.

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Answer:

a proton turns into an atom that goes kabloey into fission products and other neutrons.

Explanation:

The only option that would increase the pressure of a gas in a container is B. Increasing the temperature of the gas. Option B

To understand which factor would increase the pressure of a gas in a container, we need to consider the relationship between pressure and various variables in the ideal gas law and the kinetic theory of gases.

The ideal gas law states that pressure (P) is directly proportional to the number of gas particles (n), the temperature (T), and inversely proportional to the volume (V) of the container. Mathematically, it can be expressed as:

PV = nRT

where R is the ideal gas constant.

Based on this equation, we can analyze the options given:

A. Decreasing the kinetic energy of the gas: According to the ideal gas law, temperature is directly proportional to pressure. Therefore, decreasing the kinetic energy (which is related to temperature) would decrease the pressure, not increase it.

B. Increasing the temperature of the gas: As mentioned above, temperature is directly proportional to pressure. Increasing the temperature of the gas would increase its kinetic energy, resulting in more frequent and energetic collisions with the container walls, thus increasing the pressure.

C. Decreasing the number of gas particles: According to the ideal gas law, the number of gas particles (n) is directly proportional to pressure. Therefore, decreasing the number of gas particles would decrease the pressure, not increase it.

D. Increasing the volume of the container: According to the ideal gas law, volume (V) is inversely proportional to pressure. Increasing the volume of the container would decrease the pressure, not increase it.

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Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

Answer:

C

Explanation:

1. The molecule has to have a ratio of 1 hydrogen to 1 oxygen.

2. Hydrogen = 1amu, Oxygen = 16amu. (2*2)+(16*2) = 34amu

A compound's empirical formula is H.O. If the formula mass is 34 amu, the molecular formula is HO3. Therefore, option C is correct.

A chemical formula is a method of presenting information about the chemical proportions of atoms that make up a specific chemical compound or molecule by using chemical element symbols, numbers, and, in some cases, other symbols such as parentheses, dashes, brackets, commas, and plus and minus signs.

Molecular formulas indicate the number of atoms of each element in a compound, whereas empirical formulas indicate the simplest or most reduced ratio of elements in a compound. If the molecular formula of a compound cannot be reduced any further, the empirical formula is the same as the molecular formula.

A chemical compound's empirical formula is the simplest whole number ratio of atoms present in the compound.

The ratio of molecule is 1 hydrogen to 1 oxygen.

Hydrogen = 1amu,

Oxygen = 16amu.

( 2*2 ) + ( 16*2 ) = 34 amu

Thus, option C is correct.

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The reactions that constitute oxidation reaction are, CH3CH2OH --> CH3CHO, CH3CHO --> CH3COOH, CH3CH2CH2OH --> CH3COCH3.

An oxidation reaction is a chemical reaction in which an atom or molecule loses one or more electrons. In the case of alcohols, oxidation typically involves the loss of hydrogen atoms and the addition of oxygen atoms to form a carbonyl-containing functional group.

The reactions that constitute an oxidation reaction are the ones that involve the loss of hydrogen atoms and the addition of oxygen atoms. In the examples given, the following reactions are oxidation reactions:

1) CH3CH2OH --> CH3CHO (oxidation of a primary alcohol to an aldehyde)

2) CH3CHO --> CH3COOH (oxidation of an aldehyde to a carboxylic acid)

3) CH3CH2CH2OH --> CH3COCH3 (oxidation of a secondary alcohol to a ketone)


The other reactions shown do not involve the loss of hydrogen atoms or the addition of oxygen atoms, and therefore do not constitute oxidation reactions.

Oxidation reagents are chemical compounds that are used to carry out oxidation reactions. Some common oxidation reagents include chromic acid (H2CrO4), potassium permanganate (KMnO4), and sodium hypochlorite (NaClO).

The choice of oxidation reagent and the reaction conditions can be used to control the level of oxidation and the products formed.

For example, using a milder oxidation reagent or lower reaction temperatures can help prevent over-oxidation of the alcohol to a carboxylic acid.

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Answer: B

Upper C upper H subscript 4 (g) plus upper C l subscript 2 (g) right arrow upper C upper C l subscript 4 (g) plus upper H upper C l (g).

Upper C upper H subscript 4 (g) plus 4 upper C l subscript 2 (g) right arrow upper C upper C l subscript 4 (g) plus 4 upper H upper C l (g).

Upper C upper H subscript 4 (g) plus upper C l subscript 2 (g) plus upper H 2 (g) right arrow upper C upper C l subscript 4 (g) plus upper H upper C l (g).

Explanation: hopefully that helps answer the question

Answer:

First part is B.Upper C upper H subscript 4 (g) plus 4 upper C l subscript 2 (g) right arrow upper C upper C l subscript 4 (g) plus 4 upper H upper C l (g).  

Second Part is B. The first equation must be reversed and the third equation doubled.

Explanation:

Just did it on Edge and got it right

Answer:

2.43 grams are needed

Explanation:

I did the test

Hope this helps :)

To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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Answer:

Truck crashes into a car

Answer:

A) Scandium

B)

C) Gallium

D

Answer:

6NO2+3H2O-------->3HNO2+3HNO3

Answer:

B

Explanation:

A chemical property is anything that happens after a chemical reaction take place. So a) is a physical one bc it is talking about something that is not changed. c) is another physical one because it is talking about something that is not changed and is something that is physical . d) another physical property.

Answer:

4.30 × 10²⁰ atoms

Explanation:

You need to find out how many moles you have.  First, convert milligrams to grams.

62.5 mg × (1 g)/(1000 mg) = 0.0625 g

Next, use the molar mass to convert from grams to moles.

0.0625 g ÷ 87.62 g/mol = 7.13 × 10⁻⁴ mol

To convert from moles to atoms, you need to use Avogadro's number (6.022 × 10²³).  Avogadro's number is the number of atoms in a mole.

7.13 × 10⁻⁴ mol × 6.022 × 10²³ atoms/mol = 4.296 × 10²⁰ ≈ 4.30 × 10²⁰ atoms

You will have 4.30 × 10²⁰ atoms of strontium.

The number of Strontium atoms are 4.30 × 10²⁰ atoms

Given:

Mass of Strontium = 62.5 mg × (1 g)/(1000 mg) = 0.0625 g

Molar mass of Strontium = 87.62 g/mol

To find:

Moles of Strontium = ?

It is defined as given mass over molar mass.

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\text{Number of moles}=\frac{0.0625 g}{87.62 g/mol }\\\\\text{Number of moles}=7.13 * 10^{-4} mol\)

Avogadro's number is the number of atoms in a mole (6.022 * 10²³)

Conversion of moles into atoms:

\(7.13 × 10^{-4} mol * 6.022 * 10^{23} atoms/mol \\\\\text{ Sr atoms}= 4.296 * 10^{20} = 4.30 * 10^{20} atoms\)

Thus, Strontium atoms will be 4.30 × 10²⁰ atoms.

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Answer:

Buffer solutions are essential in regulating blood acidity because they help maintain a stable pH level in the body. The pH of blood needs to be tightly controlled within a narrow range of 7.35 to 7.45 for optimal physiological functioning. Buffers work by absorbing excess hydrogen ions (H+) or hydroxide ions (OH-) that may be introduced into the bloodstream from various metabolic reactions. For example, if the blood becomes too acidic due to an increase in H+ ions, buffer systems such as the bicarbonate-carbonic acid system can neutralize the excess H+ ions and restore the pH balance. Conversely, if the blood becomes too alkaline due to an increase in OH- ions, buffer systems can absorb the excess OH- ions and bring the pH back to normal. In this way, buffer solutions help maintain the delicate acid-base balance crucial to the proper functioning of our bodies.

The correct order of the given elements above in their increasing atomic radii are as follows:

The atomic radius of an element is one periodic properties of elements which describes the total distance between the center of the nucleus of an element to the outermost shell of an electron.

From the task given above, the atomic radii values of the elements in the problem above are: Phosphorus ( 98pm ), Cobalt ( 152pm ), Ruthenium ( 178pm ), Osmium ( 185pm ) and finally Gallium which is 187pm.

That being said, below are some few examples of periodicities which is seen in elements in the periodic table:

In conclusion, the atomic radius and atomic size are both periodic properties of elements.

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Answer:

this should help

Explanation:

3.01×10^23 molecules of oxygen gas would occupy a volume of 11.2 L at STP.

At STP (standard temperature and pressure), the temperature is 273.15 K and the pressure is 1 atmosphere (atm). We can use the ideal gas law to calculate the volume of a gas at STP. The ideal gas law is given by:

PV = nRT

where P is the pressure in atmospheres, V is the volume in liters, n is the number of moles of gas, R is the ideal gas constant (0.0821 L·atm/(mol·K)), and T is the temperature in Kelvin.

To calculate the volume of 3.01×10^23 molecules of oxygen gas at STP, we first need to convert the number of molecules to moles:

n = N/NA = 3.01×10^23/6.02×10^23 = 0.500 mol

where NA is Avogadro's number.

Next, we can use the ideal gas law to solve for the volume:

V = n R T/P = (0.500 mol)(0.0821 L · atm/( mol ·K))(273.15 K)/(1 atm) = 11.2 L

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Answer:

1). Scientific

2). Plating the diluted bacteria on media that supports the growth of only living micro organisms. Statistically accurate.

Answer:

C: Most particles in the plasma are heavy, slow, and very low density.

Explanation:

i'm smart like dat

Answer:

C is correct

Explanation:

The atomic number of gold is 79. The correct response for an atom on the periodic table with the same number of protons and electrons is gold, which has 79 protons and 79 electrons.

Every atom has a proton in its nucleus, a subatomic particle. The particle has a positive electrical charge that is the antithesis of the electron's. If a proton were isolated, it would weigh only 1.673? 10-27 kilogrammes, little less than a neutron. A stable subatomic particle known as a proton with an electric charge of +1 e and the symbols p, H+, or 1H+. Its mass is only marginally less than that of a neutron and 1836 times greater than that of an electron.

Silicon has 14 protons and 14 neutrons, for instance. It weighs 28 kilogrammes and has an atomic number of 14. Uranium's most prevalent isotope contains 146 neutrons and 92 protons. It has an atomic mass of 238 thanks to its 92 protons and 146 electrons.

The atomic number refers to the total number of protons in the nucleus of an atom. The atomic numbers of the elements are used by the Periodic Table to divide them into groupings.

The Periodic Table is used to find an element's atomic number. The atomic number is visible in the top left corner.

For instance, krypton has an atomic number of 36. This reveals that the nucleus of a krypton atom contains 36 protons.

Atoms are not electrically charged by nature. The protons' positive charges and the electrons' negative charges must be equal.

Protons and electrons must be present in an equal number in an atom. In our example, an atom of krypton needs to have 36 protons in addition to 36 electrons.

For any component:

Atomic number = number of protons + number of electrons

Hence, as an illustration of glod:

The atomic number of gold is 79. Gold therefore contains 79 protons and 79 electrons.

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Answer:

Explanation:

The question requires us to determine a proper equation to calculate the enthalpy change for the following reaction:

Considering the generic reactions and their associated enthalpy change given:

According to Hess' Law, enthalpy is a function of state, which means it does not depend on the path by which reactants are converted to products. Using this definition, we can rearrange the reactions 1 and 2 given (and apply all the changes required to their associated enthalpy change) in order to obtain the required reaction, and then calculate the enthalpy change of the final reaction considering the rearranged enthalpies of reactions 1 and 2.

Our final objective is to obtain a chemical equation that presents 1 mol of reactants A and B on the left side, and 1 mol of product C on the right side.

First, let's guarantee that we will have product C by multiplying reaction 2 by -1:

Next, we need to make sure that