The number of positively charged protons in an atoms nucleus

Explain the current theory of what a quasar is and where quasars can be found.

Q. 40 g of water. specific heat of water is 4.18 J/g*°C. temperature changes from 20° C to 25°C, how much heat energy (Q) moves from the water to the surroundings? a 3,344 J b 836 J c 4,180 J d 209 J

Sphalerite has the following properties: • found in nature • not made by organisms . pure substance • fixed crystal structure Solid Is sphalerite a mineral? yes no Submit

Ocean exploration is limited by

Solid substances are most likely to sublime if they have ... ? a. high or low vapor pressures? b. weak or strong intermoleculer forces?

1. What is the name of TiSe

Which of the following is a cost of recreational activities? A. Exercise B. Economic growth C. Noise D. Social interaction

There are three ways that heat can move from one place to another. Use examples pertaining to how heat is transferred from the sun to Earth and in the land, ocean, and atmosphere to explain all three.

What is temperature? A measure of the kinetic energy of a system. Energy of a system. How hot something is. A measure of density.

How many molecules of sodium nitrate are produced when 17 g of sodium azide, NaN3, react according to the following equation: NaN3 (aq) + AgNO3 (aq) - --> AgN3 (s) + NaNO3 (aq) Question options: 3.7x1023 1.6 x 1023 1.85x1023 6.02x1023