How many milliliters of 12.0 m hcl (aq) are needed to prepare 905.0 ml of 1.00 m hcl (aq) ?

Explain how the energy changes on a rollercoaster between potential energy and kinetic energy?

16 Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This solution is classified as (1) an element (2) a compound (3) a homogeneous mixture (4) a heterogeneous mixture

How many grams of Al2O3 are produced when 211 liters of O2 reacts with 243 grams of Al at STP? 4 Al + 3 O2 → 2 Al2O3 What is the limiting reactant?

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.

Some volcanoes have explosive eruptions, like the one at Mount St. Helens in 1980. Eruptions like these can cause abrupt changes to Earth's surface. Which of these could result from an explosive volcanic eruption? A.

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