a candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed in side the jar, why?

Select the correct answer from each drop-down menu. is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change when scientists

When the concentration of molecules on both sides of a membrane is the same, the molecules will a. move across the membrane to the outside of the cell. b. stop moving across the membrane. c. move across the membrane in both directions. d.

Zinc reacts with hydrochloric acid according to this reaction: Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) Which of the following will react the fastest? a. 2.0 gram lump of zinc in 0.10 M hydrochloric acid b. 2.0 gram sample of powdered zinc in 0.

Does oxygen have a negative or positive charge?

Explain how sublimation and deposition are alike and how they are different

Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. which one of these molecules contains polar bonds?

The flame from my candle gives off black smoke heat and light what type of changes do these indicate

Which one of the following processes results in a decrease in the number of neutrons? corrosion electron capture gamma emission positron emission alpha emission

Calculate the root mean square velocity of F2, Cl2, and Br2 at 304 K.

The total pressure inside a 1.62 cylinder kept at 35°C is 1.15 atm. If the volume of the cylinder drops to 0.74 L and the temperature remains the same, what is the new pressure inside the cylinder?