Mendeleev organized the elements:

1) alphabetically by name

2) by numbers of electrons

3) by increasing atomic weight and similar properties

4) by increasing atomic number and similar properties

Which type of change must occur to form a compound? (1) chemical (3) nuclear (2) physical (4) phase

A gas at 155 kilopascals and 25°C has an initial volume of 1.00 liter. The pressure of the gas increases to 605 kilopascals as the temperature is raised to 125°C. What is the new volume? A. 0.34 B. 1.28 C. 0.25 D. 0.44

An aspirin tablet contains 81.0 mg of aspirin, which has the molecular formula, c9h8o4.

Why is bond angle in OF2 is smaller than bond angle in H2O?

Which of these describes atomic radii as one moves from top to bottom within a group? the atomic radius decreases from top to bottom within a group. the atomic radius does not vary in any predictable way within a group.

Which resonance forms of silicon dioxide contribute the most to the actual bonding?

Magnesium has an atomic number of 12. To which atom would a magnesium atom transfer its valence electrons? A - HE B/C C - S D-B

Energy leaves the sun as light from a region called the?

How many moles of co2 are produced when 10 mol of propane (c3h8) is burned in excess oxygen?

Why are the spheres representing nitrogen and oxygen different colors