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Giovanni created this chart to study for an exam. Compound I uses ———————————————————————————————————— Sodium Hydroxide (NaOH) Plastic, soap, and paper production ———————————————————————————————————— Iron oxide (FeO) Toothpastes and antacids ———————————————————————————————————— Calcium chloride (caCl2) Snow removal ———————————————————————————————————— Calcium carbonate (CaCO3) Dark pigment in makeup Which best describes how to correct the error in the chart? A) Remove “plastics” from the uses for sodium hydroxide. B) Swap the uses for iron oxide and calcium carbonate. C) Change the use for calcium chloride to “used in preservatives.” D) Add “de-ice roads” to uses for calcium carbonate.

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Answer;

B) Swap the uses for iron oxide and calcium carbonate.

Explanation;

  • Calcium carbonate is a compound that is naturally found in marble, chalk and limestone. It is used in pharmaceutical applications as a cost effective dietary calcium supplement, and also used in antacids.
  • Calcium carbonate is also found in products such as baking powder, tooth paste, and wine among others.
  • Iron oxides are compounds of iron that are used as coloring agents in some cosmetics. The forms of iron oxides used in cosmetics are normally synthetic.

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The chemical formula of lithium carbonate is Li2CO3. Which statement below best describes the types and number of atoms of each element making up this substance? A. Two lithium atoms; one calcium atom; one oxygen atom B. One lithium atom; three carbon atoms; three oxygen atoms C. One lithium atom; one carbon atom D. Two lithium atoms; one carbon atom; three oxygen atoms

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The chemical formula of lithium carbonate is Li2CO3. Which statement below best describes the types and number of atoms of each element making up this substance? A. Two lithium atoms; one calcium atom; one oxygen atom B. One lithium atom; three carbon atoms; three oxygen atoms C. One lithium atom; one carbon atom D. Two lithium atoms; one carbon atom; three oxygen atoms

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Given that mass was lost from the copper (ii) carbonate hydroxide hydrate during heating, in this decomposition reaction, how many moles of solid product were produced? the molar mass of the solid product is 79.545 g/mol (number of moles = mass (g) / molar mass (g/mol)).

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This problem is to apply Roult’s Law.

Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv

p = Xsolv * Po sol

X solv = number of moles of solvent / number of moles of solution

The solvent is water and the solute (not volatile) is glycerin.

Number of moles = mass in grams / molar mass

mass of water = 132 ml * 1 g/ml = 132 g

molar mass of water = 18 g/mol

=> number of moles of water = 132 g / 18 g/mol = 7.33333 mol

mass of glycerin = 27.2 g

molar mass of glycerin:, C3H8O3: 3 * 12 g/mol + 8 * 1 g/mol + 3*16 g/mol = 92 g/mol

number of moles of glycerin = 27.2g / 92 g/mol = 0.29565

total number of moles = 7.33333 moles + 0.29565 moles = 7.62898 moles

=> X solv = 7.33333 / 7.62898 = 0.96125

=> p = 0.96125 * 31.8 torr ≈ 30.57 torr ≈ 30.6 torr.

Answer: 30.6 torr

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(a) How much negative charge is on each oxygen of the carbonate ion?

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(a) How much negative charge is on each oxygen of the carbonate ion?

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Nitrate (NO3–), ammonium (NH4+), and carbonate (CO32–) are examples of polyatomic ions. TRUE OR FALSE

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Answer:

The integumentary system covers the surface of the body is true about the integumentry system.

Explanation:

The integumentary system includes the skin, nails, glands, hairs, and nerves. Its main role is to act as a barrier to protect the body from the outside environment. It also retains body fluids, regulates body temperature, eliminates waste products, and protects against disease.

The integumentary system is the largest organ in the body that covers the surface of the body.

Thus, The integumentary system covers the surface of the body is the true statement about the integumentry system.

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Match the term to its description. 1. deforestation 2. combustion 3. circulation 4. weathering 5. calcium carbonate a. the primary component of mollusk shells and coral skeletons b. the logging of trees, which removes producers from the carbon cycle c. the burning of fossil fuels to make energy d. the process which brings up nutrients from the deep ocean e. the wearing down of rocks over time

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Answer:

The integumentary system covers the surface of the body is true about the integumentry system.

Explanation:

The integumentary system includes the skin, nails, glands, hairs, and nerves. Its main role is to act as a barrier to protect the body from the outside environment. It also retains body fluids, regulates body temperature, eliminates waste products, and protects against disease.

The integumentary system is the largest organ in the body that covers the surface of the body.

Thus, The integumentary system covers the surface of the body is the true statement about the integumentry system.

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