Something breaking is a sign of what kind of change?

A) physical only

B) chemical only

C) physical and chemical

Gold is isolated from rocks by reaction with aqueous cyanide, CN:4 Au (s) + 8 NaCN (aq) + O 2 (g) + H 2 O (l) longrightarrow 4 Na[Au (CN) 2 ] (aq) + 4 NaOH (aq).

What is a chemical reaction? List an example

How many atoms of carbon are contained in 47.6 g of al2 (co3) 3? the molar mass of al2 (co3) 3 is 233.99 g/mol?

The objective lens in a microscope is also called the eyepiece. -T? -F?

What is the definition of specific heat?

What type of reaction takes place when atoms or molecules rearrange to form new substances?

If you pump air into cycle tyre a slight warming effect is noticed at valve stem why

Butter is melted in a pan. Which of the following is true about the change? A. It is a physical change that releases energy B. It is a chemical change that absorbs energy C. It is a physiscal change that absorbs energy D.

Describe how secondary consumer is dependent on the sun for its energy

What % of the ideal soil is air?