Which of the following items represents a chemical change? burning melting evaporation freezing

The physical properties of a compound are similar to those of its elements.

a. True

b. False

Lewis dot structure for F2 (g)

What is an ion? a) an atom that has either gained or lost electron (s) b) an atom that is sharing electrons with another atomc) an atom that loses all of its protonsd) an atom that has lost one or more neutrons

Explain how you would determine the volume of a powdered solid, a liquid, and a rock

How do ions differ form atoms

What does concentration mean

How quickly or slowly a substance heats or cools is measured by its

What is the total number of valence electrons in a germanium atom in the ground state? (1) 22 (3) 32 (2) 2 (4) 4

If a patient/'s blood pressure is 145 over 85 mmHg, what is it in atmospheres (atm) ?

Which of the following is nicknamed the "powerhouse" of the cell?

Which is a sign of a chemical change? Question 6 options: Paint on a freshly painted wall dries and is no longer sticky. Ice cream melts when left at room temperature. Vinegar is mixed with baking soda resulting in carbon dioxide bubbles.