Is a pencil sharpener an open or closed system?

What is the equation for raising the temperature of water?

What is the substance called that is being dissolved in a solution? concentrator solute mixture solvent What is the substance called that dissolves the other substance in a solution? mixture solvent solute concentrator

Students wanted to test which acid was most effective at preventing hornworms from feeding on tomato plants. The students sprayed salicylic acid on one group of 15 tomato plants and jasmonic acid on a second group of 15 tomato plants.

Describe the scale used to measure the basicity of a substance. Demonstrate how you could differentiate a weak base from a strong one

Ammonia is a compound of hydrogen and nitrogen that dissolves easily in water. can you conclude that the hydrogen nitrogen dissolve in water?

Explain chemical bonds

During an investigation, similar effervescent tablets were dropped into a beaker containing cold water and a beaker containing tap water. The table below shows an incomplete record of the investigation.

The air above earth's surface is at a different temperature what is responsible for this difference in temperature

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year-1. what fraction of the tritium initially in a sample is still present 30 years later?

A covalent bond in which electrons are shared unequally