The periodic table says that the average mass of copper is 63.55 but there is no such thing as copper-63.55. Why? (please use copper-63 and copper-64 in your answer)

Answer:

NaOH + HCl —> NaCl + H₂O

Explanation:

From the question given above, we obtained the following equation:

4NaOH + 4HCl —> NaCl + H₂O

The equation can be balance as follow:

4NaOH + 4HCl —> NaCl + H₂O

There are 4 atoms of Na on the left side and 1 atom on the right side. It can be balance by putting 4 in front of NaCl as shown below:

4NaOH + 4HCl —> 4NaCl + H₂O

There are a total of 8 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of H₂O as shown below:

4NaOH + 4HCl —> 4NaCl + 4H₂O

Next, divide through by 4 to express the equation with the lowest coefficients.

NaOH + HCl —> NaCl + H₂O

Now the equation is balanced.

NOTE: Smallest coefficients are always used to represent a balanced equation.

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

strontium sulfate (s) + lithium iodide (aq)  →  strontium iodide (aq) and lithium sulfate (aq).

The reaction between strontium sulfate (SrSO4) and lithium iodide (LiI) can be represented by the following balanced chemical equation:

SrSO4 (s) + 2 LiI (aq) → SrI2 (aq) + Li2SO4 (aq)

In this reaction, strontium sulfate (SrSO4) in its solid state reacts with lithium iodide (LiI) in its aqueous state to produce strontium iodide (SrI2) and lithium sulfate (Li2SO4), both in their aqueous forms. The reaction can be understood by examining the ionic compounds involved. Strontium sulfate dissociates into strontium ions (Sr2+) and sulfate ions (SO4^2-), while lithium iodide dissociates into lithium ions (Li+) and iodide ions (I^-). The ions then rearrange to form the products, with strontium combining with iodide to form strontium iodide, and lithium combining with sulfate to form lithium sulfate. It's important to note that this reaction occurs in an aqueous solution, indicating that lithium iodide is dissolved in water. The solid strontium sulfate reacts with the aqueous lithium iodide to produce the aqueous products. This reaction demonstrates the chemical combination of the ions present in strontium sulfate and lithium iodide to form different ionic compounds.

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Answer:

b I think it is the correct answer

Answer:

A

Explanation:

.75 + .25 + 1.25 = 2.25 atm

1 atm is 760 mm hg

2.25 * 760 = 1710 mm HG

Answer:

\(\huge\boxed{\sf 2.25\ atm = 1710\ mm\ of\ Hg}\)

Explanation:

Partial pressure of gas A = 0.75 atm

Partial pressure of gas B = 0.25 atm

Partial pressure of gas C = 1.25 atm

Total partial pressure = 0.75 atm + 0.25 atm + 1.25 atm

= 2.25 atm

We know that:

1 atm = 760 mm of Hg

Multiply 2.25 to both sides

2.25 atm  = 760 × 2.25 mm of Hg

2.25 atm = 1710 mm of Hg

\(\rule[225]{225}{2}\)

Answer:

C. 2,3,3,4-tetramethylhexane

Explanation:

Exothermic refers to chemical interactions that aerobic respiration. Combustion reactions release higher energy. Endothermic refers to atoms and molecules that either use or absorb reactive power.

A chemical process known as an endothermic releases energy as heat or light. It is an endothermic reaction's opposite. Chemical equation expressed as reactants + products + energy. An reaction mechanism is one in which electricity is given off as light or warmth.

A response is deemed to be exothermic if it produces heat while also undergoing a net decrease in basic enthalpy change. Samples include those type of combustion, iron rust, including water froze. Exothermic processes are those that discharge heat and energy into the surroundings.

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Answer:

Data

Explanation:

You are right

The balance chemical equation is 4 NH₃+ 3 O₂\(\rightarrow\) 2 N₂ + 6 H₂O and 3.375 moles is the corresponding amount of O₂.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

In the given equation, 4 moles of ammonia gives 3 moles of oxygen thus for 4.55 moles it is 4.55×3/4=3.375 moles

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Answer:

Copper and silver should work.

Explanation:

Answer:

1) The chemical equation is:

Al +  CuCl2 ---> Cu + AlCl3

2) You have to balance the equation to state the coefficients:

2Al + 3CuCl2 ---> 3Cu + 2Al Cl3

3) Now the coefficients tell you the molar ratios.

2 mol Al : 3 mol CuCl2 : 3 mol Cu : 2 mol AlCl3

4) The molar ratio of CuCl2 to Al is:

3 mol Cu Cl2 / 2 mol Al = 3/2 = 1.5

Explanation:

Answer: the charge on each electron

Hydrogen molecule and an oxygen molecule have in common as" they are identical in because they have both odorless, colorless, and gaseous elements. "

A group of two or more elements bonded together with the force of attraction is described as chemical bonds usually referred to as a molecule.

Any compound that could be broken down into simpler chemicals by regular chemical processes is referred to as a chemical element as well as element.

Hydrogen and oxygen both have certain similarities. They are identical in because they have both odorless, colorless, and gaseous elements. All living things require water, which is created when it all comes together. Oxygen but also hydrogen are essential for all living organisms, both directly and indirectly

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Answer: increased knowledge of genetics leads to reclassification.

Explanation:

The classification system was initially was made on the basis of the similarities in their physical, internal characters and their habitats. Classification systems are always subject to update, based on the different factors.

The increased knowledge of the genome and the DNA is helping to tell that the species or organisms look different in several ways are actually closely related or share the ancestry.

Taxonomy implies that hierarchical classification of living things.

Taxonomy refers to the hierarchical system of classifying living things. This method has many sub classifications to aid the easy identification of organisms.

However, the increasing knowledge of genetics and evolution have consistently challenged the paradigms in classifying organisms.

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The preferred arrangement of electrons in a molecular structure can be determined by calculating the electronic configuration of each atom in the molecule.

What is electronic configuration?

The electronic configuration of an atom is determined by the number of protons in the nucleus and the specific rules governing the filling of energy levels and orbitals. The electronic configuration is usually represented using a notation that indicates the number of electrons in each energy level or orbital.

what is delocalized electron ?

Delocalized electrons are electrons that are not restricted to a specific location or region in a molecule or material, but instead are spread out over multiple atoms or molecules. In other words, delocalized electrons are free to move throughout a larger region instead of being confined to a single atom or bond.

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If 60 grams of the substance are added to 100 g of water, the solution can be categorized as supersaturated.

The graph shows the number of grams that can be dissolved in 100 grams of water at different temperatures. In general, solubility increases with temperature.

According to the graph, at a temperature of 30°C, it is possible to dissolve a total of 48 to 49 grams of \(KNO_{3}\). This information implies that if we add 60 grams at this temperature not all the substance would be dissolved, and therefore the solution would be supersaturated.

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Answer:

Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O. 
Photosynthesis: 6CO2 + 6H2O → C6H12O6+ 6O.

Explanation:

:)

Explanation:

reaction cannot be both endothermic and exothermic at the same time.

According to Newton's second law, force equals mass multiplied by acceleration. As a result, in a car accident, the force exerted by the vehicle and its occupants decreases as the time required for the vehicle to stop increases.

We clearly observed in the Exploration that when two cars collide, each feels a force from the other.

According to Newton's third law, when one object exerts a force on another, the second object feels an equal and opposite force exerted by the first object. This is very clear in the two-object collision.

The force with which your body is struck in a collision is referred to as crash force. Crash force is equal to your body weight multiplied by the vehicle's speed.

Newton's second law states that force equals mass multiplied by acceleration. As a result, the force exerted by the vehicle and its occupants in a car accident decreases as the time required for the vehicle to stop increases.

Thus, this way it hits the car.

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Answer:

it's zero

Explanation:

water is composed of hydrogen and oxygen

The total volume of HCl(aq) used in the titration was 9.50 mL, the total volume of NaOH(aq) used was 3.80 mL, and the molarity of the sodium hydroxide solution was 0.25 M.

To determine the total volume of HCl(aq) used in the titration, we subtract the initial buret reading from the final buret reading:

Total volume of HCl(aq) = final buret reading - initial buret reading

Total volume of HCl(aq) = 25.00 mL - 15.50 mL

Total volume of HCl(aq) = 9.50 mL

To determine the total volume of NaOH(aq) used in the titration, we use the same approach:

Total volume of NaOH(aq) = final buret reading - initial buret reading

Total volume of NaOH(aq) = 8.80 mL - 5.00 mL

Total volume of NaOH(aq) = 3.80 mL

To calculate the molarity of the sodium hydroxide solution, we use the following formula:

Molarity of NaOH(aq) = (Molarity of HCl(aq) * Volume of HCl(aq)) / Volume of NaOH(aq)

Substituting the given values, we get:

Molarity of NaOH(aq) = (0.10 M * 9.50 mL) / 3.80 mL

Molarity of NaOH(aq) = 0.25 M

Therefore, the molarity of the sodium hydroxide solution is 0.25 M.

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Answer:

Se

Explanation:

SeO3 is trigonal planar molecule having all bond angles at about 120 degrees.

It is found in the fourth row and is a member of group sixteen. Its trioxo anion possess the structure shown in the question.

The element that forms an ion in the fourth row of the periodic table is Selenium (Se). Therefore option 1 is correct.

Selenium (Se) belongs to Group 16 of the periodic table and has an atomic number of 34. It can gain two electrons to achieve a stable electron configuration and form the Se²⁻ ion, also known as the selenide ion. In this ion, Selenium has a charge of -2 due to the gain of two electrons.

Selenium has six valence electrons and tends to gain two electrons to achieve a stable octet configuration, similar to the noble gas configuration of argon (Ar). By gaining two electrons, Selenium forms the Se²⁻ ion, also known as the selenide ion. In this ion, Selenium has a charge of -2.

Thus, The element that forms an ion in the fourth row of the periodic table is Selenium (Se).

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The compound n - hexane as shown does not dissolve in water.

Due to a large difference in polarity between the two compounds, n-Hexane does not dissolve in water.

Water is a polar molecule, which means that one end of it (the hydrogen side) has a slight positive charge and the other end (the oxygen side) has a slight negative charge. The unequal distribution of electrons within the water molecule, which produces a dipole moment, is the cause of this polarity.

N-Hexane, on the other hand, is a nonpolar molecule. The electrons are uniformly distributed throughout the molecule, which is made up of carbon and hydrogen atoms bound together in a straight chain. N-Hexane lacks a substantial dipole moment as a result.

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Answer:directly to the right

Explanation:

Atomic size increases from left to right

To find an element with a greater atomic number, The student should look ;     Directly to the right ( D )

The atomic number of an element in the periodic table increases across the period ( i.e. when you move from left to right ) while the atomic radius of an element increases as you go down in a group in the periodic table.

Therefore if you want to find an element in the same period that posses a higher atomic number you should move from left to the right of a period in the periodic table.

Hence we can conclude that the to find an element with a greater atomic number the student should look directly to the right.

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Answer:

C.) If the solid is conductive, the bonds are metallic.

1) Substances with ionic bond conduct an electric current in liquid, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.

2) Substances with covalent bond not conduct an electric current in liquid and solid state, because they not have free ions or electrons.

3) Substances with metallic  bond conduct an electric current in liquid and solid state, because they have mobile electrons. Most metals have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.

Explanation: