Which of the following is an example of a heterogeneous mixture?
a. water
b. salt
c. water
d. dirt brass

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Which tool is least in predicting weather

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?