Questions in chemistry

Questions in chemistry

[Free] Iron is a solid, grey metal. Oxygen is a colorless gas. When iron and oxygen chemically combine, rust is formed. Rust has a reddish-brown color. Why does rust differ from iron and oxygen?

[Free] A water molecule gains enough energy to enter the gas phase. Is this a chemical or physical change? Why?

[Free] How many grams are in 2.4 moles of sulfur?

[Free] How many grams are in 11.9 moles of chromium?

[Free] Explain why animals must eat food, but plants do not have to.

[Free] What are three physical properties of aluminum foil?

[Free] What kind of particles make up a compound?

[Free] Why does land heat up faster than water?

[Free] Explain Fajan's Rule.

[Free] Why is mitosis a form of asexual reproduction?