Which two observations below can be evidence that a chemical change has occurred

A. Production of bubbles (a gas)

B. melting

C. vaporization

D. production of heat

All of the following are true regarding alcoholic fermentation, except that alcoholic fermentation A. produces as much energy as cell respiration. B. uses glycolysis. C. produces ethanol. D. does not require oxygen.

Find the mean number of beans eaten for each of the three-day periods: Days 1 to 3, Days 4 to 6, and Days 7 to 9. Use the values you recorded in Table D of your Student Guide. Record the mean numbers in Table E.

Which best describes Rutherford's model of the atom? fish swimming in an aquarium a sports stadium with a marble at the center a scoop of chocolate chip ice cream a dense, solid ball

A sample of nitrogen goes from 21L to 14L and it's pressure increases from 100kPa to 150kPa. The final temperature is 300K. What was the initial temperature in Kelvins?

Which substance will require more energy to heat if all the samples have the same mass and same temperature change?

What is the meaning of monovalent?

What is a neutron and what charge does it have

Examples of mechanical and physical weathering in our neighborhoods

Balance the redox reaction KMNO4 + NH3 - --> KNO3 + MNO2 + KOH + H2O

A representation that shows the distribution of geologic features in a given area