which of the following trace elements needed by humans is commonly added to table salt?

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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                                        .+.*~+ Ecosystem +~*.+.

Answer:

mass = kg

volume = cubic meters

time = seconds

length = meters

temperature = degrees Celsius

Explanation:

Answer:

3

Explanation:

Collect like terms and divide by the coefficient of k

Answer:

3k + 9 = 18, find k, k is equal to 3

Explanation:

3k + 9 = 18, k = 3

3(3) + 9 = 18

3x3 is 9

9 + 9 = 18

therefore, k is 3

Answer:

BaBr2 (aq) + H2SO4 (aq) → BaSO4 (s) + 2 HBr (aq)

Explanation:

This is a precipitation reaction: BaSO4 is the formed precipitate.

According to the previous session, the equation is:

Deuterium 2/1 H + Tritium 3/1 H -> 4/2 He + 1/0 n + energy

Answer:

In which organ would you expect the contents of food to be more ground up? (Gizzard)

These external structures are the penis, scrotum, epididymis, and testes. The internal organs of the male reproductive system are called accessory organs. ... To discharge sperm within the female reproductive tract.

The pH values of the solution after the addition of various amounts of acids are as follows:

(a) When 0.0 mL HCl is added; pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl; pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl; pH = 14

(d) After adding 40.0 mL of 0.100 M HCl; pH = 2.70

The equation of the reaction between NH₃ and HCl is:

NH₃ + HCl → NH₄Cl

Before the addition of HCl:

The concentration of NH₃ solution = 0.300 M

The initial concentration of OH- can be calculated from the Kb of NH₃ :

Kb = [NH₄⁺][OH⁻] / [NH₃]

1.8 x 10⁻⁵ = x² / 0.300

x = 0.0024 M

The initial concentration of OH⁻ is 0.0024 M, and the initial pH of the solution ill be:

pH = 14 - pOH

pH = 14 - (-log[OH-])

pH = 11.62

(a) When 0.0 mL HCl is added;

pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl;

moles of HCl added = (0.100 mol/L) x (0.0100 L)

moles of HCl added = 0.00100 mol

The moles of NH₃ initially present = (0.300 mol/L) x (0.0100 L)

moles of NH₃ initially present = 0.00300 mol

the mole ratio of HCl and NH₃ = 1:1

The remaining moles of NH₃ = 0.00300 mol - 0.00100 mol

remaining moles of NH₃ = 0.00200 mol

The volume of the solution is now 10.0 mL + 10.0 mL = 20.0 mL or 0.0200 L.

The new concentration of NH₃ = 0.00200 mol / 0.0200 L

concentration of NH₃ = 0.100 M

The concentration of OH- can be calculated from the Kb of NH₃ using the new concentration of NH4+:

Kb = [NH4+][OH-] / [NH3]

1.8 x 10⁵ = x² / 0.100

x = 0.0042 M

The new concentration of OH- is 0.0042 M, and the new pH will be:

pH = 14 - (-log[OH-])

pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl;

the volume of the solution is 40.0 mL or 0.0400 L

The moles of HCl added = (0.100 mol/L) x (0.0300 L)

moles of HCl added = 0.00300 mol

moles NH3 reacted = 0.00300 mol - 0.00300 mol

moles NH3 reacted = 0.00000 mol

[NH₄⁺] remaining [OH⁻] = 0

The concentration of OH- is 0 M, so the pH = 14 - (-log[OH-])

pH = 14

(d) After adding 40.0 mL of 0.100 M HCl;

moles HCl = (0.100 mol/L) x (0.0400 L)

moles HCl = 0.00400 mol

The volume of solution = 0.050 L

All NH₃ has reacted and the remaining moles of HCl = (0.00400 mol - 0.00300 mol) / 0.0500 L

the remaining moles of HCl = 0.00200 M

The concentration of H₃O⁺ can be calculated from the concentration of HCl:

0.00200 M HCl produces 0.00200 M H₃O⁺

pH = -log[H₃O⁺]

pH = -log(0.00200)

pH = 2.70

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Answer:

228.4 kPa

Explanation:

From thw question,

PV/T = P'V'/T'..................... Equation 1

Where P = Inital pressure, T = Initial Temperature, V = Initial Volume, P' = fInal Pressure, V' = Final volume, T' = Final Temperature.

Make P' the subject of the equation

P' = PVT'/TV'...................... Equation 2

Given: P = 115 kPa, V = 15.0 dm³, T = 33°C = (33+273) K = 306 K, T' = 51.2°C = 51.2+273 = 324.2 K, V' = 8.00 dm³

Substitute these values into equation 2

P' = (115×15×324.2)/(306×8)

P' = 228.4 kPa.

Answer:

B. False

Explanation:

step by step explanation

Answer:

False

Explanation:

The net ionic equation is obtained as; \(2Ag^+(aq) + CO_{3} ^{2-} (aq) -------- > Ag_{2} CO_{3}\).

The net reaction equation is the reaction equation that shows the ions that actually underwent a change in the reaction. We have to first write down the molecular reaction and then write down the net ionic reaction.

We know that the ionic reaction would involve ions and it would not contain any molecular species.

The molecular reaction is;\(K_{2} CO_{3} (aq) + 2AgNO_{3} (aq) ------ > Ag_{2} CO_{3} (s)+ 2KNO_{3}(aq)\)

If we get the molecular reaction equation, we can now see that it is clear the ions that were able to undergo a change in the reaction. The net ionic equation is obtained by looking out for the ions that have undergone change to form the silver carbonate precipitate.

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The element that can be found in both plays and stories is "characters."

Characters are an essential element of both plays and stories. They are the individuals or entities that drive the narrative, interact with each other, and contribute to the development of the plot. In plays, characters are typically portrayed by actors who perform their roles on stage, while in stories, characters are described and depicted through written words.

Characters can be central or supporting figures in a play or story, and they play a vital role in engaging the audience or readers. They have distinct personalities, motivations, and relationships that influence the events and conflicts within the narrative. Through their actions, dialogue, and character development, they contribute to the overall themes and messages conveyed by the play or story.

Whether it is a theatrical production or a written narrative, the presence and portrayal of characters are fundamental to creating engaging and compelling plays and stories.

Thus, the element that can be found in both plays and stories is "characters."

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The molarity of the solution of HF is calculated as 1.70 M.

The molarity of a solution is defined as the number of moles of solute per liter of solution. To calculate the molarity of a solution of HF, we need to first determine the number of moles of HF that are present in the solution.

In this case, we are told that 8.066 moles of HF are added to a container and filled with water to a final volume of 4.75 liters. We can use this information to calculate the molarity as follows:

Molarity = moles of solute / liters of solution

moles of solute = 8.066 mol HF
liters of solution = 4.75 L

Molarity = 8.066 mol HF / 4.75 L

Molarity = 1.70 M

Therefore, the molarity of the solution of HF is 1.70 M.

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Answer:

D: lose an electron

Explanation:

when an atom loses an electron it's positively charged and when it gain an electron it is negatively charged

Answer:

Your answer I think would be 3,764,000 .If Im wrong please correct me and comment below.

I got my answer by converting 3,764 liters to millileters using a converter calculator

then I rounded it to the nearest whole number using the rounding calculator from calculator soup. This has worked for me in the past.

Hope this helps, good luck!

Answer:

Explanation:

If it is at a higher energy level, it is said to be excited, or any electrons that have higher energy than the ground state are excited. They are then called degenerate energy levels.

Protease is considered a proteolytic enzyme, which breaks down proteins into their amino acids by hydrolysis.

An enzyme is defined as the biological protein which is used to speed up biochemical reactions in the body cells.

There are various types of enzymes and they include the following:

The protease is an example of proteolytic enzyme that helps in the break down of protein molecules into smaller molecules called amino acids by a chemical process called hydrolysis.

Hydrolysis is defined as the chemical reaction whereby water reacts with a substance to lead to its decomposition.

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The correct coefficients for the substances in the unbalanced equation for the combustion of propane are as follows:

Direct Answer:

2 C3H8 (g) + 10 O2 (g) → 6 CO2 (g) + 8 H2O (g)

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Let's start with the carbon atoms. The left side has 2 carbon atoms because there are two propane molecules (C3H8), while the right side has 6 carbon atoms because there are 6 carbon dioxide molecules (CO2). To balance the carbon atoms, we need to multiply the propane molecule by 2.

2 C3H8 (g) + ___ O2 (g) → 6 CO2 (g) + ___ H2O (g)

Next, let's balance the hydrogen atoms. The left side has 8 hydrogen atoms because there are 2 propane molecules, each containing 4 hydrogen atoms. The right side has 16 hydrogen atoms because there are 8 water molecules (H2O). To balance the hydrogen atoms, we need to multiply the water molecule by 8.

2 C3H8 (g) + ___ O2 (g) → 6 CO2 (g) + 8 H2O (g)

Finally, let's balance the oxygen atoms. The left side has 2 oxygen atoms from the propane molecule, and there are a total of 10 oxygen atoms in the oxygen molecules on the right side. To balance the oxygen atoms, we need to multiply the oxygen molecule by 5.

2 C3H8 (g) + 5 O2 (g) → 6 CO2 (g) + 8 H2O (g)

The correct coefficients for the substances in the equation are 2, 5, 6, and 8, which correspond to propane, oxygen, carbon dioxide, and water, respectively. Therefore, the answer is C. 2, 10, 6, 8.

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A Keq value of 29 suggests that the products are strongly favored over the reactants at equilibrium, and the ratio of the concentration of products to the concentration of reactants is 29:1.

The equilibrium constant, Keq, for a chemical reaction is a measure of the relative concentrations of products and reactants at equilibrium. If the value of Keq for a reaction is greater than 1, it indicates that the products are favored at equilibrium, and if Keq is less than 1, it indicates that the reactants are favored. In the case of a Keq of 29, it suggests that the products are significantly favored over the reactants at equilibrium.

More specifically, the Keq value indicates the ratio of the concentration of products to the concentration of reactants at equilibrium. A Keq of 29 indicates that the concentration of products is 29 times greater than the concentration of reactants at equilibrium. This suggests that the reaction strongly favors the formation of products, and the equilibrium is shifted towards the products side.

It is important to note that the value of Keq is temperature-dependent and can change with changes in temperature. A decrease in temperature can cause the equilibrium to shift towards the reactants, while an increase in temperature can shift it towards the products. However, at any given temperature, a Keq value greater than 1 indicates that the reaction is proceeding towards the products side, and a Keq value less than 1 indicates that it is proceeding towards the reactants side.

In summary, a Keq value of 29 suggests that the products are strongly favored over the reactants at equilibrium, and the ratio of the concentration of products to the concentration of reactants is 29:1.

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Approximately 8.79 grams of CO₂ are produced when 20 grams of CaCO₃ and 25 grams of HCl are mixed.

The balanced chemical equation for the reaction between calcium carbonate (CaCO₃) and hydrochloric acid (HCl) is:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

From the equation, we can see that 1 mole of CaCO₃ reacts with 2 moles of HCl to produce 1 mole of CO₂. The molar mass of CaCO₃ is 100.09 g/mol, and the molar mass of HCl is 36.46 g/mol.

To find the mass of CO₂ produced, we need to determine which reactant is limiting. This can be done by calculating the number of moles of each reactant and comparing them to the stoichiometric ratio in the balanced equation.

Number of moles of CaCO₃ = 20 g / 100.09 g/mol = 0.1998 mol

Number of moles of HCl = 25 g / 36.46 g/mol = 0.685 mol

According to the balanced equation, 1 mole of CaCO₃ reacts with 2 moles of HCl. Therefore, the limiting reactant is CaCO₃, since only 0.1998 moles of CaCO₃ are available to react with HCl.

From the balanced equation, we know that 1 mole of CaCO₃ produces 1 mole of CO₂. Therefore, the number of moles of CO₂ produced is also 0.1998 mol.

The molar mass of CO₂ is 44.01 g/mol. Therefore, the mass of CO₂ produced is:

Mass of CO= 0.1998 mol x 44.01 g/mol = 8.79 g

Therefore, approximately 8.79 grams of CO₂ are produced when 20 grams of CaCO₃ and 25 grams of HCl are mixed.

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H2O2 is a covalent compound and not an ionic one.

Each dash in the structural formula of hydrogen peroxide,

—H—O—O—H—

represents a single covalent link. In other words, each link consists of two shared electrons, formally with one electron from each atom at its ends. H2O2 is the provided chemical. The Hydrogen and Oxygen atoms are held together by covalent bonding in the molecule. Since the chemical contains neither cations nor anions, ionic bonding is not involved. H2O2 is regarded as a molecular compound or substance since covalent bonding occurs in it. Ionic compounds have a particular type of chemical chemistry called ionic bonding. Consequently, a molecular substance is represented by the formula H2O2.

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Answer:

Some indicators of rusting include:

a. color change

b. formation of as solid

Explanation:

Rusting is a redox ( a reaction in which reduction and oxidation occur concurrently) reaction which occcur when metallic iron is exposed to air and water or water vapor reacts with the oxygen and water to form a hydrated mixture of oxides of the metal.

The shiny metallic iron becomes oxidized to Fe²⁺ and Fe³⁺ ions while neutral oxygen gas molecules are reduced to O²⁻ ions. The shiny metallic iron also loses its lustrous appearance as the process proceeds and is covered by a layer of rust.

The equation for reaction is given below:

4Fe(s) + 30₂(g) + xH₂O(l) -----> 2Fe₂O₃. xH₂O(s)

The product of the reaction above is known as rust and is reddish-brown solid.

Rusting causes iron to become flaky and weak as rust is very light and porous, reducing the strength and appearance of iron which are desirable properties of iron when used in construction. The rusting of iron can lead to damage to automobiles, railings, bridges, and several other iron structures.

Answer:

color change and formation of a solid.

Explanation:

the answer that comes after is chemical also hope this helps!

Answer:

Explanation:

Ionic bond

Ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.

Answer:

CBr4

Explanation:

Answer:

CBr4

Explanation:

It is CBr4 I hope it helps

I need help with it too

If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it.

In the case above,  the vapor pressure of the solution is known to be lowered if compared to the vapor pressure of the pure solution.

Therefore if a non-volatile solute is said to be place or added to a pure solution such as water, the vapor pressure of the solution will be reduced than that of the pure solution.

Hence, the statement that If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it is correct.

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In solid form, ionic compounds do not conduct electricity. Ionic compounds will conduct electricity when melted to their liquid state. This is due to the electrons being locked in place when in solid form, but liquid form allows for the electrons to move freely.

Answer:

Explanation:

Now, you know that this solution has a molarity of 6.00 M, which basically means that every liter, which is the equivalent of 1000 mL, will contain 6.00 moles of ammonia. Since we've picked a sample of 1000 mL, you can say that it will contain 6.00 moles of ammonia. To convert this to grams, use the compound's molar mass

Answer:

When a saturated solution at a high temperature is cooled, why is the solution separated as a solid? When a saturated solution at a high temperature is cooled, inter molecular space between the molecules of the solution decreases. As a result, no more solute can remain in a solution separating out as a solid crystal.

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.