Why is a control needed in a valid experiment?

A sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°C. If the system is at dynamic equilibrium, which of these statements is true? A. The rate of freezing is equal to the rate of melting. B.

In your own words right a definition of earth core

Rutherford's gold foil experiment demonstrated that 1. Dalton was correct in claiming that atoms are hard, structureless spheres. 2. lead could be transformed into gold. 3. electrons must have quantized energy levels. 4.

The bond angles in a molecule of boron trifluoride are A. 90 degrees B. 107 degrees C. 109.5 degrees D. 120 degrees

What is the best description of what Becquerel observed in his experiment? A. stable nuclei absorbing high-energy particles as they formed less stable compositions B.

6. State the number of significant digits in each of the following measurements. (a) 1.00 cm

How do you boil water less than 100

What quantum numbers specify these subshells 5s 6p 4d?

What is the molarity of sucrose if 150.0 g is dissolved in 250.0 mL of solution

What are sister chromatids