What's a closed system? Explain

Frozen CO2 or dry ice is different from CO2 gas in the atmosphere because it has a. no mass b. a fixed shape c. a lower density d. no fixed volume

If the Earth moved farther away from the sun, which of these would probably happen?

Which is larger milliliter or cientiliter

Which of the following is an ionic compound? 1) Magnesium chloride 2) gold 3) water 4) carbon monoxide

What are two important quantum-mechanical concepts associated with the Bohr model of the atom?

A compound is 53.31 % C, 11.18 % H, and 35.51 % O by mass. What is its empirical formula? Insert subscripts as needed.

What is the element Ar classified as in the periodic table?

Two objects, one heavy and one light, travel at one of two speeds. Which will have the most inertia?

Which statements correctly describe water boiling in a pot? Air bubbles from the atmosphere are being absorbed. The water's internal kinetic energy is increasing. The water is gaining internal potential energy. The water's temperature is increasing.

Biofuel is any fuel that is produced from living or once living matter in a short period of time, days, weeks, or even months.