Which one of the following is a characteristic of a metal?
a. becomes negative when combined with other elements
b. changes the color of litmus paper to red
c. conducts heat readily
d. reacts with bases to produce salts

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles

Use the drop-down menus to match each part of the scenario to the correct scientific practice. akira records the speed of a reaction without a catalyst and then with a catalyst. akira creates a reaction without a catalyst and repeats the reaction with a catalyst. akira turns in a written lab report to his science teacher. akira wonders, "will adding a catalyst speed up this chemical reaction? " akira writes in his notes that adding a catalyst sped up the chemical reaction because the catalyst lowers the activation energy needed to get the reaction started.

Which pair of chromosomes determines sex in humans? a.15th b.1st c.23rd