2 Ca + O2 = 2 CaO 50g Ca used what is the grams of CaO?

1. Calculate the average volume of Na2S2O3 needed for the titration of 25.00 mL of diluted bleach. 2. Use the average volume and molarity of Na2S2O3 to determine the molarity of the diluted bleach (hint: use the equations in the introduction). 3.

Occurs when the moon moves between the Earth and Sun and blocks the light

In a plant, roots absorb water and nutrients. Those materials are then transported to other parts of the plant. Which statements describe the system in an animal that functions in a similar way? Choose all answers that are correct. A.

HQ5.49 Use standard enthalpies of formation to calculate the standard enthalpy of reaction for the following reaction: 2 H 2 S (g) + 3 O 2 (g) → 2 H 2 O (l) + 2 SO 2 (g) ΔH ∘ rxn

Chemistry-Griffin Emma Drummond Percent Composition For the following compounds, determine the formula, formula mass, and percent com SHOW ALL WORK! Example: Sodium Chloride = NaCl Na: 1*22.990 = 22.990 (22.990/58.443) * 100 = 39.34% Na Cl: 1*35.

A gas occupies 72.1 at stp. At what temperature would the gas occupy 85.9 L at a pressure of 93.6 kPa?

An 80 kg volleyball player lands from a jump and tries to stop her forward motion. The normal contact force exerted by the floor on her shoes is 2000 N. The friction force exerted by the floor on her shoes is 600 N acting backward on the player.

How does electronegativity affect the polarity of the bond between two atoms?

How much heat (energy) would need to be absorbed by 1.5 g of liquid water to cause a temperature change of 30.45 °C? The specific heat of water is 4.18 J/gºC.

What happens when electrons are passed from one atom to a more electronegative atom?