Which of the following is a sign that a chemical change has taken place when wood burns?
bubbles
rust
production of a liquid
production of heat

What ions are formed when hcl dissolves in water?

Which of the following could represent a single-replacement reaction? a. element + compound = element + compound b. element + element = compound c. compound +compound = compound + compound d. compound = element + element

Agust of wind pushes a beach ball with a force of 9 newtons. the ball rolls 10 meters in 3 seconds. what is the power of the wind? 900 w 90 w 30 w 3 w