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?

The comparison of table salt and glucose

31 What is the number of electrons in an Al3 + ion? (1) 10 (3) 3 (2) 13 (4) 16

A drug company is testing the effectiveness of a new blood pressure medicine using rats as test subjects what are some possible factors that must remain constant during the testing?

1. A scientist investigating the cell membrane concludes that a particular substance is transported by active transport.

An iceberg has a volume of 0.1642 ML. What is the mass of the ice (in kg) composing the iceberg (at 0o C) ? The density of ice at 0o C is 0.917g/cm^3

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?

What ionic bond occurs between what particles? A. Two Negative Ions B. A positive and negative ion C. Two positive ions D. Two neutral atoms

Which of the following are good traits of a hypothesis? it will be able to be tested it can predict an outcome it will explain the observations all of these

What is the mass of a box of nails

In a phase change of water between the liquid and the gas phases, 770.1 kJ of energy was released by the system. What was the product, and how much of it was formed in the phase change? (dа ta: H₂O (l) → H₂O (g) ΔH = 44.01 kJ/mol.) A.