1) Which state of matter has the properties of indefinite shape and definite volume? a) Solid b) Dark c) Gas d) Liquid 2) Which of the following elements do all organic compounds contain? a) Helium b) Calcium c) Carbon d) Oxygen 3) Which molecule is represented by the chemical formula C6H12O6? a) Glucose b) DNA c) Carbon Dioxide d) Hydrogen peroxide 4) What is the meaning of this hazard symbol ? a) Radiation b) Toxic c) Bio-hazard d) Environmental hazard 5) What is the smallest component of an element? a) Proton b) Neutron c) Electron d) Atom

Табло

Визуален стил

Опции

Шаблон за превключване

Възстановяване на авто-записаната: ?