a bar of gold is melted into liquid the liquid is then poured into a mold to make pieces of jewelry is the process a chemical change or a physical change?

Zinc is more active than cobalt and iron but less active than aluminum. Cobalt is more active than nickel but less active than iron.

Which layer is broken up into several plates which "move and float very slowly? Their very slow motion is the cause of plate tectonics, a process associated with continental drift, earthquakes, volcanoes, and the formation of mountains.

State 3 functions of enzymes in the body

All of the following are possible outcomes if waterways continue to be polluted except increased oxygen levels. reduced fish respiration and plant productivity. increased amounts of bacteria and protozoans.

What is the relationship between valence electrons and the number of bonds that can be formed?

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.

How many sulfide ions are present in 23.5g of Sb2S3

2. An automobile tire has a pressure of 210 kPa at 293 K. What will be the tire pressure after driving, if the tire temperature rises to 308 K?

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and 6.779 g. Which other measurement of the block's mass would be most precise? A. 6.702 g B. 6.781 g C. 6.605 g D. 6.858 g