2
Q:

What is the gram formula mass of Li2SO4?

A) 101.2487 B) 109.9446
C) 111.2687 D) 106.5871

Answer:   B) 109.9446



Explanation:

The term gram formula mass is synonymous with molecular mass. So, to get this, we must add molar mass of all the elements in this compound.

 

Given compound is Lithium Sulphate - Li2SO4

Elemental calculation ::

Li  -  Lithium   -   6.941    -     2   -   13.88200 %
S  -  Sulfur     -    32.065   -    1   -   32.065 %
O  -  Oxygen   -   15.9994  -    4   -   63.9976 %

Now, total = 12.6264 + 29.1647 + 58.2090 = 109.9446 

 

Hence, the gram formula mass of Li2SO4 = 109.9446.

Q:

SO2 Polar or Nonpolar?

Answer

SO2 has a net dipole moment and has a bent shape in its structure as water molecule. Hence it is a polar molecule.

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0 17
Q:

What are cathode rays made of?

Answer

Cathode rays made of beams of electrons.

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1 20
Q:

Washing soda is the common name for

A) Sodium Bicarbonate B) Calcium Carbonate
C) Sodium Carbonate D) Calcium Bicarbonate
 
Answer & Explanation Answer: C) Sodium Carbonate

Explanation:

Washing soda is the common name for Sodium Carbonate (Na2CO3). It is also called as Soda Ash.

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0 31
Q:

What is the main ingredient in face powder?

A) Calcium carbonate B) Talc
C) Magnesium carbonate D) China clay
 
Answer & Explanation Answer: B) Talc

Explanation:

Talc or talcum is a clay mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 is the main ingredient in face powders that absorbs moisture and oil.

 

It is also called as French Chalk. Other ingredients include Calcium carbonate (chalk), Magnesium carbonate, China clay, starches like rice and potato, zinc oxide,...

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0 51
Q:

Anaerobic glycolysis occurs without

A) water B) glucose
C) oxygen D) All of the above
 
Answer & Explanation Answer: C) oxygen

Explanation:

Anaerobic glycolysis is the transformation of glucose to lactate when limited amounts of oxygen (O2) are available. 

 

Hence, Anaerobic glycolysis occurs without oxygen.

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0 47
Q:

Which half reaction correctly represents reduction?

A) Fe2+ + e- ---> Fe3+ B) Au3+ + 3e– ---> Au
C) Ag ---> Ag+ + e- D) All of the above
 
Answer & Explanation Answer: B) Au3+ + 3e– ---> Au

Explanation:

A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.

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0 119
Q:

Which of the following definitions describes a chemical hazard?

A) Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness B) These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks
C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job D) The most commonly thought of hazards for construction
 
Answer & Explanation Answer: C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job

Explanation:
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0 119
Q:

Covalent bonds are formed when electrons are

A) Transfer of electrons B) Sharing of electrons
C) Dividing of electrons D) All of the above
 
Answer & Explanation Answer: B) Sharing of electrons

Explanation:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

 

Examples of compounds with covalent bonds ::

HCl, CO2, O2,... 

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