Lava that cools quickly forms what type of rock

Periods on the periodic table are

Addition of 50. J to a 10.0-g sample of a metal will cause the temperature of a metal to rise from 25ºC to 35ºC. The specific heat of the metal is closest to0.0005 J / (g·ºC) 0.50 J / (g·ºC) 2.5 J / (g·ºC) 4.2 J / (g·ºC)

What is the net ionic charge of a calcium ion?

Acids (H+) reacts with metal hydroxides (OH¯) to from a. Salt and hydrogen gas b. Salt and water c. Salt and hydrogen oxides d. Salt and alkali.

How many electrons are on the 4d sub level

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

At which temperature would atoms of a He (g) sample have the greatest average kinetic energy? (1) 25°C (3) 273 K (2) 37°C (4) 298 K