How can i demonstrate that a piece of chalk has mass

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.

At 200 degrees F, substance 1 is a liquid, substance 2 is a solid, and substance 3 is a gas. Which substance has molecules with no kinetic energy? A. Substance 1 B. Substance 2 C. Substance 3 D. None

What do we call a group that comes off of the main carbon chain

Which statement describes a system that consists of sugar crystals dissolving in water? The system becomes more ordered and has an increase in entropy. The system becomes more ordered and has a decrease in entropy.

What property of the materials used in computer chips makes them useful as switches that turn electricity on and off

Convert 3.57 moles of aluminum to grams

An average microwave uses a frequency of 2.54 GHz. How much energy is emitted?

Why scientist form a hypothesis

Step two of the procedure states: "Using sterile technique, place a loopful of inoculum from the M. luteus culture in the drop of nigrosin and mix." Which of the procedures qualifies as sterile technique?

If 4.34 moles of potassium react with excess water, how many moles of hydrogen gas would be produced at STP