A) 1.0×10−2 B) 3.18 C) 1.0×10−7 D) 6.6×10−4
A) It is higher (3.18 vs < 0) B) It is lower C) It is not measurable D) It is exactly the same
A) It remains exactly the same B) It decreases significantly C) It increases greatly due to homoassociation D) It becomes a base
A) Hydroxide (OH−) B) Tri-fluoride (F3−) C) Bifluoride (HF2−) D) Fluoride (F−)
A) -10.2 B) -11 C) -12 D) 3.18
A) Gold B) Glass C) Plastic D) Rubber
A) H2O·HF B) HF2− C) H3O+·F− D) H2F+
A) Neutralization B) Dehydration C) Electrolysis D) Homoconjugation
A) It interferes with nerve function B) It does not damage skin C) It is a mild anesthetic D) It has an pleasant odor
A) Pure alcohol B) Baking soda C) Hydrogen peroxide D) Calcium gluconate gel
A) Bone damage due to calcium interaction B) Bone mineralization C) Bone dissolution into gas D) Bone hardening
A) High lipid affinity B) Presence of oxygen C) High boiling point D) Low volatility
A) It may reach dangerous levels without an obvious odor B) It is completely odorless under all conditions C) It has a very strong, pungent odor D) It smells exactly like sulfur
A) It is comparable B) It is significantly stronger C) It cannot be compared D) It is much weaker
A) Bronchitis B) Rhinitis C) Hair loss D) Pulmonary edema
A) A byproduct of gold refining B) A solid salt of fluoride C) A gaseous form of hydrogen fluoride D) A solution of hydrogen fluoride in water
A) Colorless, acidic and highly corrosive B) Yellow, neutral and oily C) Blue, basic and non-corrosive D) Opaque, acidic and viscous
A) 49% B) 85% C) 25% D) 10%
A) Copper sulfate B) Nitrogen gas C) Organofluorine compounds D) Pure water
A) Cryolite and aluminium trifluoride B) Magnesium sulfate and iron pyrite C) Potassium nitrate and silver fluoride D) Sodium chloride and calcium oxide
A) Production of metallic aluminium B) Cleaning rust from metal C) Manufacturing of glass lenses D) Etching silicon wafers
A) Sodium hydroxide B) Acetic acid C) Ethanol D) Buffered oxide etch
A) Nitrogen oxides B) Sulfur dioxide C) Carbon dioxide D) Silicon fluorides
A) Increasing the steam pressure B) Reducing the temperature of the water C) Preventing the oxidation of steel D) Dissolving iron oxides and silica-based contaminants
A) Acid maceration B) High-pressure filtration C) Centrifugal separation D) Heating the rock to melting
A) Antoine Lavoisier B) Dmitri Mendeleev C) Marie Curie D) Carl Wilhelm Scheele
A) Quartz B) Apatite C) Bauxite D) Fluorite
A) 500 °C B) 100 °C C) 25 °C D) Approximately 265 °C
A) Hydrochloric acid B) Phosphoric acid C) Sulfuric acid D) Nitric acid
A) Copper containers B) Borosilicate glass C) Fluorinated plastic (PTFE) D) Stainless steel
A) As a weak acid B) As a strong base C) As a neutral salt D) As a highly volatile gas |