Which measurement describes the pressure of a gas?

725 mmHg

1.2 g/L

2.5 L

315 K

A chemist has a sample of hydrated Li2SiF6 and it weighs 0.4813 grams. He heats it strongly to drive off the water of hydration, and after heating, he found that the anhydrous compound has a mass of 0.391 grams.

Supersonic flight can cause molecules on the surface of an airplane to break apart and chemically react. What additional challenges to flight does this create? O A. The flight pattern can become erratic due to loss of thrust and drag. O B.

A current of 10.4 a is applied to 1.25 l of a solution of 0.552 m hbr converting some of the h + to h2 (g), which bubbles out of solution.

Which of the following statements a about scientific hypothesis is false? a. A hypothesis should be created when the outcome for its test is known. b. A scientific hypothesis is an educated guess about why something happens. c.

How is a thermochemical equation different from a chemical equation?

The Molecule Is ___ A) Symmetrical and Polar B) Symmetrical and non polar C) Asymmetrical and polar D) Asymmetrical and non polar

Fill in the blanks: Note: both blanks are the same word The weight on an object depends on its (blank) and the (blank) of earth.

Why would putting argon and pottassium in order of there atomic masses be wrong

How many moles of calcium chloride (CaCl2) are needed to react completely with 6.2 moles of silver nitrate (AgNO3) ? 2AgNO3 + CaCl2 → 2AgCl + Ca (NO3) 2

A block of aluminum has the dimensions: length 5cm, width 3cm and height 1cm and weighs 40.5 g. What is its density?