Blank! An organism whose presence or absence reveals the environmental condition?

423.3 mL of gas is at 49.2 C. It is compressed to a volume of 79 mL. What is the new temperture. Express your answer in Kelvin.

Choose the element with the highest electronegativity: which one is it? oxygen iron cesium iodine

Select the best answer. Which of these statements reflects the relationship between elements, atoms, and chemical symbols?

In a calorimeter, 6.68 kJ of heat was absorbed by 20 g of ice. What is the enthalpy of fusion of the ice? q=m∆ahf

Glucose, C6 H12O6, is used as an energy source by the human body. The overall reaction in the body is described by the equation C6H12O6 (aq) + 6O2 (g) ⟶ 6CO2 (g) + 6H2O. 1) Calculate the number of grams of oxygen required to convert 38.

Which situation describes evidence of a chemical change? A. When food color is added to water, it changes color. B. A solid changes into liquid when heated. C. A solution feels warm after a cool solid is added to it. D.

Identify the intermediate in the halogenation of alkanes. a) Anionb) Cationc) Radicald) Dimer

An archer pulls her bowstring back 0.370 m by exerting a force that increases uniformly from zero to 264 N. (a) What is the equivalent spring constant of the bow?

If 5.0g of KCLO3 is decomposed, what volume of O2 is produced at STP?

For metallic structures, does the packing efficiency (see sample exercise 12.1 in textbook) increase or decrease as the number of nearest neighbors (the coordination number) decreases?