In addition to the six elements most prevalent in living things there are other elements that are required for human life. Which element is necessary for humans to maintain a strong skeletal system?A. xenon
B. calcium
C. rhodium
D. chlorine

Answers

Answer 1

Answer:

Answer:

Calcium

Explanation:

Calcium is needed in our body to make bones (skeletal system) and teeth strong. Apart from making bones and teeth strong, it is required in other body functions such as:

Enabling blood to clot

Helping in muscle contraction

Helping heart muscle in maintaining normal heart beat

About 99% of calcium present in the body is stored in bones. Calcium is stored in bones in the form of calcium phosphate.

Bones continuously replace old calcium with new one. Calcium is not produced in our body. It comes from daily diet, therefore, it essential to take calcium rich diet.

Answer 2

Answer: B. Calcium! I hope this help.
If your bones don't have enough calcium you get osteoporosis.

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Several steps are involved in the industrial production of sulfuric acid. One step involves the oxidation of sulfur dioxide gas to form sulfur trioxide gas. A catalyst is used to increase the rate of production of sulfur trioxide gas. In a rigid cylinder with a movable piston, this reaction reaches equilibrium, as represented by the equation below.2SO2(g) + O2(g) <==> 2SO3(g) + 392 kJ Explain, in terms of collision theory, why increasing the pressure of the gases in the cylinder increases the rate of the forward reaction. Determine the amount of heat released by the production of 1.0 mole of SO3(g). State, in terms of the concentration of SO3(g) , what occurs when more O2(g) is added to the reaction at equilibrium.
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The study of chemicals containing carbon is traditionally called what type of 18?a. inorganic c. analytical b. bio d. organic

A chemist combined chloroform ( CHCl 3 ) and acetone ( C 3 H 6 O ) to create a solution where the mole fraction of chloroform, χ chloroform , is 0.203 . The densities of chloroform and acetone are 1.48 g/mL and 0.791 g/mL , respectively. Calculate the molarity of the solution.

Answers

Answer:

Molarity is 13,4M

Explanation:

As mole fraction of chloroform is 0,203; mole fraction of acetone will be 1-0,203=0,797

That means that per 100 moles you have 20,3 moles of chloroform and 79,7 moles of acetone.

Using molar mass and density it is possible to know the volume these moles occupy, thus:

Chloroform: 20,3 moles× $(119,38g)/(1mol)$ × $(1mL)/(1,48g)$ = 1637mL= 1,637L

Acetone: 79,7 moles× $(58,08g)/(1mol)$ × $(1mL)/(0,791g)$ = 5852mL = 5,852L

That means that total volume is 1,637L + 5,852L = 7,489L

As moles are 100, molarity is:

100mol / 7,489L = 13,4M

I hope it helps!

Final answer:

To determine the molarity of the solution, calculate the number of moles of each compound in the solution, and then divide the total moles by the total volume of the solution. Ensure all units are in the appropriate metric system and take into consideration potential effects of molecular interactions on the total volume.

Explanation:

The first step to calculate the molarity of the solution of chloroform (CHCl3) and acetone (C3H6O) is to determine the number of moles of each compound in the solution. The mole fraction is given as 0.203 for chloroform, therefore the mole fraction for acetone will be 0.797 (since the total mole fraction in a solution is equal to 1).

Next, we calculate the mass of each compound with the known densities. Upon performing these calculations, we then utilise the definition of molarity, which is moles of solute per liter of solution. This can be calculated by knowing the total moles and total volume of the solution. Note that we'd convert all units to the appropriate metric system before carrying out these calculations (density in g/mL, molar mass in g/mol, etc.).

It is also important to consider that the mass and volume of each solution component might not be directly additive due to potential molecular interactions between acetone and chloroform.

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The element with 8 electrons in its 3d sublevel isa. O.
b. Ne.
c. Ar.
d. Ni.

Answers

According to the electronic configuration, the element with 8 electrons in its 3 d sublevel is nickel.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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The element with 8 electrons in its 3d sublevel is Ni, Nickel. The answer is letter D. The rest of the choices do not answer the question above.

David says, "Pure honey has nothing else added." Susan says ,"The honey is not really pure. It is mixture of many subsatnces . Who is right? Explain your answer.

Answers

Really, both David and Susan are right; they were using the term "pure" in different ways. David likely meant "pure honey" in the sense that the honey was not altered or had any additives. Susan used pure as in a "pure substance" in chemistry. Susan is also right, because honey is a medley of carbohydrates, proteins, amino acids, and vitamins and minerals. Chemically, honey is not a pure substance- it's a mixture.

Which of the following solutions contains the greatest number of ions?. . 1) 200.0 mL of 0.10 M iron (III) chloride. 2) 800.mL of 0.10 M sucrose

Answers

The number of ions is determined by multiplying the given volume and the molarity of the solution. The product is multiplied to the number of ions when the solution dissociates. In this case:

1. 200.0 mL of 0.10 M iron (III) chloride = 0.2*0.1* 4 = 0.08
2. 800.mL of 0.10 M sucrose = 0.8 * 0.1 * 1 = 0.08

The two solutions have the same number of ions.

What is an ionic bond

Answers

Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

Answer:

Ionic bond is formed by the cations and anions and their attractive forces.

The temperature at which a substance boils is an example of a physical property.a. True
b. False

Answers

A physicalproperty is any property that does not concern with the change of the substance.The changes in the physical property can be used to describe itstransformations or evolutions from its initial state. They are often referredto as observables. Temperature at which asubstance boils is an example of a physical property. The temperature at which a substance boils describes astate of a physical system. It describes the transformation of a liquid fromits liquid state to its vapor by increasing its temperature.

The answer would be (a.)True.

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The standard enthalpy change for the reaction of SO3(g) with H2O(l) to yield H2SO4(aq) is ΔH∘ = -227.8 kJ . Use the following information S(s)+O2(g)→SO2(g), ΔH∘ = -296.8kJ SO2(g)+12O2(g)→SO3(g) , ΔH∘ = -98.9kJ to calculate ΔH∘f for H2SO4(aq) (in kilojoules per mole). [For H2O(l),ΔH∘f = -285.8kJ/mol].