5 Compare How is a chemical change different

from a physical change?

Which two layers of Earth are mainly composed of metallic elements such as nickel and iron, which are abundant in meteoroids and comets?

A solution is made by dissolving 25.20 g of aluminum acetate in 185.0 mL of water. What is the concentration of acetate ions?

A chemical reaction in which two or more elements switch places is called?

Aquino drives his skidoo 7 kilometers north. He stops for luch and then drives 5 kilometers south the 7 kilometers north what was his displacement?

Which list includes elements with the most similar chemical properties? A) Br, Ga, Hg B) Cr, Pb, Xe C) O, S, Se D) N, O, F

A line in the lyman series of hydrogen has a wavelength of 122 nm. from what state did the electron originate?

What are the products of photosynthesis? A. Glucose and oxygen B. Oxygen, solar energy, and glucose C. Carbon dioxide, water, and solar energy D. Hydrogen, oxygen, and carbon

A sample of a substance that has a density of 0.824 g/mL has a mass of 0.421 g. Calculate the volume of the sample.

The tyndall effect is used to detect A: suspensions B:liquid solitions C:tyndalls D:colloida

Which of the following is not an empirical formula? A. C3H8O B. Sb2S3 C. C2N2H8 D. BeCr2O7