CHM 105 FINAL REVIEW

 

 

To which class does the element chromium (Cr) belong?

 

 

Trasition Elements

 

 

The correct symbol for the ion formed by nitrogen is:

 

 

N3-

 

Which of the following combinations of elements in a compound would be molecular?

A) Sodium and Nitrogen

B) Calcium and Oxygen

C) Nitrogen and Oxygen

D) Potassium and Chlorine

E) Sodium and Sulfur

 

 

C) Nitrogen and Oxygen

 

 

Which of the following combinations of elements in a coupound would be ionic? A) Barium and Fluorine B)Nitrogen and OXygen C) Sulfur and OXygen D) Phosphorus and Oxygen E) All of these

 

 

A) Barium and Fluorine

 

Based on common charges, which formula for an ionic compound is incorrect? A) CaCl, B) NaF, C) SrO, D) MgS, E) K3P

 

A) CaCl

 

 

Based on common charges, which formula for an ionic compound is incorrect?

A) Ba(NO3)2, B) Ca(OH)2, C) MgCl3, D) Al2O3, E) KBr

 

 

C) MgCl3

 

Which of the following formula/name pairs is incorrect?

A) CO caron monoxide

B) CaO calcuim oxide

C) MgCl2 Magnesium Chloride

D) AlP aluminium Phosphide

E) Li2SO3 dilithium Sulfite

 

 

E) Li2SO3 dilithium Sulfite

 

Correct formula for tetraphosphorus Hexasulfide

 

 

P4S6

 

The correct formula for dinitrogen pentoxide

 

N2O5

 

 

The correct formula for tetraphosphorus Hexoxide

 

 

P5O6

 

A 1-ounce serving of Cheetos has 2.90 times 10 squared mg of sodium. What is the mass equivalent to in units of grams?

 

0.290 g (Divide the above formula by 1000 to switch mg to g)

 

A can of cashews has a mass of 8.5 ounces. What is the miass in g? (16 ounces =453.6g)

 

 

240g

 

Nonelectrolytes are compounds which break apart into ions when dissolved in water.

 

True or False

 

False

 

A molecular compounds is composed of atoms of a metal and a nonmetal.

 

True or false

 

False

 

 

Most molecular comounds remain as molecules when dissolved in water.

True or false

 

 

True

 

 

 

 

Water is considereda mixture because it consists of hydrogen and oxygen.

True or false

 

False

 

 

The larger the sample of a given substance, the more dense it is.

True or false

 

 

False

 

 

A glass of tea with ice cubes in it is an example of a heterogeneous mixture.

True or false

 

True

 

 

One calorie is the amount of heat energy required to raise the temperature of 10.0g of water by 1 degree C.

True or false

 

 

False

 

 

If the number of 6.250 is rounded to 2 significant figures, it would be reported as 6.3

True or false

 

 

True

 

 

The number of protons in the nucleus of an atom is the atomic number of that atom.

True or false

 

 

True

 

 

In order for an atom of an element to be neutral, its number of electrons must equal its number of protons.

True or false

 

 

True

 

 

The mass of an isotope is the sum of the number of protons and neutrons in its nucleus.

True or false

 

 

True

 

 

A cation is a postively charged ion that has fewer electrons than protons.

True or false

 

 

True

Which of the following statements regarding the emphirical formulas, molecular formulas, and percent composition is correct? A) The emphirical formula and molecular formula of a given compound are always the same.  B) Two compounds having different percent compositions of the same two elements are not the same compound. C) The emphirical formula and molecular formula of a given compound are never the same. D) Data on the percent composition of the elements in a given compound is insufficient to determine the empirical formula of the compound. E) The compound S2Cl2 would have the same empirical and molecular formulas.

 

B) Two compounds having different percent compositions of the same two elements are not the same compound. 

d) 1.5 x 10^23

 

 

Which of the following statements regarding empirical and molecular formulas is correct? A) Information on percent composition is all that is necessary to determine both an empirical and a molecular formula. B) A compound with an empirical formula of CH2O and a molar mass of 90 g/mol would have a molecular formula of C3H6O3. C) The compound C2H4 and C3H6 have different empirical formulas. D) The formula Ca2Cl4 is the correct empirical formula for calcium chloride. E) The compound benzene has a molecular formula of C6H6, so its empirical formula would be C3H3.

 

B) A compound with an empirical formula of CH2O and a molar mass of 90 g/mol would have a molecular formula of C3H6O3.

A reaction which has two elements are reactants and one compound as a product:

A) a decomposition reaction

B) A combination reaction

C) A single-displacement reaction

D) A double-displacement reaction

E) combustion reaction

 

B) a combination reaction

A reaction which has two compounds as reactants and two compounds as products:

A) decompostion reaction

B) combination reaction

C) single-displacement reaction

D) double-displacement reaction

E) combustion reaction

 

D) double-displacement reaction

Which of the following processes is exothermic? A) boiling water to make tea B) cooking an egg C) heating food in a microwave oven D) an acid and base reacting toether and causing the solution to become warm E) water in a swimming pool getting warmer in the sun.

 

D) an acid and base reacting together, and causing the solution to become warm.

Which of the following processes is endothermic? A) burning gasoline in an internal combustion engine B) evaporation of perpiration on your skin C) burning wood in a fireplace D) condensing steam on a mirror E) hot coffee cooling down as it sits on the table.

 

B) evaporation of perspiration on your skin.

True or False:

One mole of methane (CH4) and one mole of oxygen (O2) would have the same number of atoms.

 

B) False

 

Give an example of endothermic reaction

 

Ice pack

 

Give an example of exothermic reaction.

 

 

Fire

True or False:

ALL waves are characterized by wavelength, amplitude, frequency and speed.

 

True

True or False:

Electromagnetic radiation does not include visible light from the sun, microwaves, Xrays, and radio waves.

 

False

True or False:

A wave’s frequency is measure in hertz.

;

True

Which of the following travel at the speed of light? A) atomic emission spectrum B) principle quantum number C) wavelength D) electromagnetic radiation

;

A) atomic emission spectrum

Which of the following travel at the speed of light? A) microwaves B) radio waves C) xrays D) all of the above.

;

D) All of the above.

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