1) Which of the following is a compound? a) Oxygen b) Nitrogen c) Water d) Hydrogen e) Helium 2) Which of the following is an element a) Carbon dioxide b) Magnesium Sulfate c) Potassium d) Hydrogen Peroxide e) Water 3) Which is an element a) O b) CO2 c) H2O d) H2O2 e) NaCl 4) Which is a compound? a) Xe b) Ar c) Cl3 d) CH4 e) Na2 5) A compound is... a) Two elements that make one b) Two or more different elements combine to make one c) The same element more than once d) An element with a large subscript 6) An element is a) A pure substance that can not be broken down b) a pure substance that can be broken down c) a combination of elements d) a proton and neutron

Element vs. compound

由
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？