In this model of a molecule of ammonia, NH3, how many covalent bonds are represented?

The gas left in a ussd aerosol can is at a pressure of 103kPa at 25.0 °C. if the can heats up to 50.0°C what is the pressure of gas inside the can assuming the volume of the can is constant

The goal of this lesson is to answer the lesson question, "what does half-life 'look like' for a radioactive substance?" fill in the blanks to complete the hypothesis.

Explain the difference between a physical separation and a chemical separation

When substances are formed that are different from the starting substances, a physical change has occurred. True False

Which mass law (s) is/are demonstrated by the observation that a sample of potassium chloride from chile contains the same percent by mass of potassium as one from poland? a. law of conservation of mass b. law of definite composition c.

2K3N + 3CaCrO4 → Ca3N2 + 3K, CrO Give the formula for the second reactant: How many potassium atoms on the reactant side: How many oxygen atoms on the product side?

Why does aluminum most often have an oxidation state of + 3

In the thermal decomposition of copper carbonate, the black solid left behind weights less than the original copper carbonate. Why?

How many joules are needed to warm 675 grams of water (specific heat = 4.186 J/g degrees Celsius) from 12 degrees Celsius to 85 degrees Celsius?

Pentaborane b5h9 (s) burns vigorously in o2 to give b2o3 (s) and h2o (l). what is δh° for the combustion of 1 mol of b5h9 (s) ? substance δh°f (kj/mol) b2o3 (s) - 1273.5 b5h9 (s) + 73.2 h2o (l) - 285.8