Activation energy is only required to start an exothermic reaction. True or False?

Select the stronger bond in the following group c=C C-F

Describe what you know about the motion of particles.

Which process would most effectively separate two liquids with different molecular polarities? (1) filtration (3) distillation (2) fermentation (4) conductivity

MnO2 + 4 HCl → Cl2 + MnCl2 + 2 H2O Given 145.7 grams of MnO2, how much hydrochloric acid (HCl) is needed to use up the MnO2 completely (MM in g/mol: MnO2=86.94, HCl = 36.46, Cl2=70.9, MnCl2=125.84, H2O=18.02) ? 244.4 g 10.55 g 145.5 g 1407 g

Which of the following is not a skill scientist use to learn about the world A. Predicting B. Observing C. Inferring D. Scientist use all of the above skills

Can beans grow inside water

Why does the sun appear to move from east to west across the sky? A. Due to Earth's revolution B. Due to Earth's rotation C. Due to the sun's revolution D. Due to the sun's rotation

The hydrogen gas from the reaction of 1.0 g of iron with excess hydrochloric acid is collected in a 15.0 L flask at 25 degrees Celsius. What is the pressure of the hydrogen gas in this flask?

Which electrons participate in chemical bonding? a. core electrons b. valence electrons c. the innermost electrons d. any electrons

You can find the pH of a substance by using a. plain paper. b. a thermometer. c. litmus indicator. d. a conductivity tester.