Which indicator of a chemical change is shown?

A science glass with smoke coming out the top

formation of a gas.

Formation of a precipitate.

Change in energy.

Change in color.

Why does the straw in a glass of water look like it is bigger in the water than it really is?

1. Which formula represents the correct isomer of CH2 = CH-CH2-CH3? A) CH3-CH=CH-CH3 B) CH3-CH2-CH2-CH3 C) CH3-CH3=CH3-CH3 D) CH3-CH-CH2-CH3

Which of these is an example of a wetland area? A. marsh B. stream C. city park D. farm land

What does the coefficient in a balanced chemical equation represent

What is the molarity of a solution that is made by adding 57.3 g of MgO to 500.0 mL of solution?

Common properties of sodium, calcium, iron, and gold

The closeness of a measurement to its actual value is a measure of its A. usefulness. B. reproducibility. C. precision. D. accuracy.

At 300 k the pressure inside a gas filled container is 500 kPa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas

The SI unit for current is: joules volts ohms amps

In chemical reactions, there is a conservation of what?