What is the major current use of solar thermal energy? A. to grow crops for biomass B. to provide heat and hot water for houses C. to collect heat from Earth's igneous rocks D. to power wind farms

How many neutrons are there in the nucleus of u92235

What has research determined about the orbit of an electron around a nucleus? Electrons orbit and remain with in specific energy rings. Electrons orbit the nucleus in circular motions exactly as shown on the classic Bohr model.

A compound is 80.0% carbon and 20.0% hydrogen by mass. assume you have a 100.-g sample of this compound.

Magnesium and nitrogen react to form magnesium nitrate. Which of the following expressions represents this chemical reaction?

What is the electron configuration of a chlorine ion in a compound of BeCl2? A. [2.8.7]- B. [2.8.8]- C. [2.8.8]+ D. 2.8.7

What is the two significant figure of 11.76 cm^2? Rounded Answer

What happens to the size of a metal element as it becomes a cation? a. it increases b. it decreases c. it remains the same d. it is impossible to tell unless you know the specific element

Heat that flows by conduction is the transter of thermal energy between substances in contact. What must occur for this to happen? The two systems must be the same temperature, The two systems must not be touching each another.

What piece of information connects mass and moles?

What relationship can be seen in an element's placement within a group and its electron configuration?