Which of the following requires the most input of energy?

A. melting a substance

B. raising the temperature of the substance by 1° C

C. decreasing the temperature of the substance by 1° C

D. vaporizing a substance

1. Explain the arrangements of electrons in the atom and include what valence electrons are.

Which substances pass through a leaf's stomata? phosphorus nitrogen oxygen water trace elements carbon dioxide

Explain using the particle theory why objects generally expand when heated and contract when cooled?

What is the formula for aluminum bromide?

Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?

8) Rubidium [Kr]5s has an atomic radius of 248pm. Tin, another period 5 element, has an atomic radius of 140pm. What would the correct atomic radius for xenon be? Xenon is also in Period 5 and a noble gas.

A 2.7 M solution contains 0 2.7 moles of solute per 1000 g of solvent. 2.7 moles of solute per 1000 mL of solution. 0 2.7 grams of solute per 100 mL of solution. 0 2.7 grams of solute 100 g of solution. per

What is the molar concentration of Cu2 + in a solution that is labelled 5 ppm Cu2+? a) 7.9x10^ (-5) M b) 7.9x10^ (-6) M c) 5.1x10^ (-6) M d) 5.5x10^ (-4) M

Drag each tile to the correct box. A student writes down several steps of the scientific method. Put the steps in the best order. Analyze the experimental data. Make a hypothesis. Conduct an experiment. Communicate the results.

What is a glass rod used for in chemistry and biology laboratory?