CHEMISTRY quiz
Here are sample questions from the CHEMISTRY category. Think about each answer before revealing it – and then check how you'd do against real players in the app.
What do most nonmetal oxides form with water?
For example, sulfur trioxide reacts with water to give sulfuric acid. Metal oxides, by contrast, form bases with water.
What is the chemical composition of quartz?
Quartz is a crystalline form of silica.
Which metal melts at about 30°C, so it turns liquid when held in the hand?
Gallium melts at 29.76°C. Mercury is already liquid at room temperature.
Which alkaloid is used, among other things, to dilate the pupils?
It paralyzes the eye's accommodation and speeds up the pulse.
Does a solution of table salt in water conduct electricity?
- No
- Yes
Salt dissolved in water dissociates into sodium and chloride ions, which carry electric charge.
Is nitric acid an organic compound?
- No
- Yes
No. Nitric acid (HNO₃) is an inorganic compound – it contains no carbon.
Which chemical element has the symbol B?
It has atomic number 5 and is a metalloid.
What are the organic compounds formed by the condensation of acids and alcohols called?
The name comes from the German "Essigäther", ethyl acetate.
What is solid carbon dioxide called?
Dry ice sublimates at −78.5 °C, turning directly into gas. It is used, among other things, for smoke effects on stage.
What is the chemical compound with the systematic name 2-aminoethanesulfonic acid called?
Which chemical element has the symbol Og?
Its discovery was confirmed in 2015, and it was named in 2016.
Which element owes its name to the Latin word for rainbow?
The name iridium comes from the Latin "iris", meaning rainbow. The element was discovered in 1803 by Smithson Tennant. Iridium is one of the densest elements – its density is about 22 g/cm³, almost twice that of lead.
Selenium is named after the Moon. Which element is named after the Sun?
The name comes from the Greek word helios. Helium makes up about 23% of the mass of all elements in the universe.
What are the vertical columns of the periodic table called?
The horizontal rows are periods.
What is turpentine mainly used for?
It is a colorless or yellow flammable liquid.
What are sulfates?
They were formerly called vitriols or copperas.
Is osmium, element number 76, a metal or a nonmetal?
It is a hard, brittle metal of the platinum group.
What color is acetone?
It has a characteristic pungent smell.
Is silicon a metalloid?
- No
- Yes
Silicon is a metalloid – an element with properties intermediate between metals and nonmetals. This group also includes boron, germanium, arsenic, antimony, selenium and tellurium, among others. It was silicon's semiconducting properties that made it the foundation of electronics.
What is the pH of a neutral solution?
7
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