Give at least two ways to know if a reaction is endothermic or exothermic

What is the very small center core of an atom is called?

4. Indicate the ionic equation, the net-ionic equation, and the spectator ions of the following molecular equation. HCl (aq) + Fe2O3 (s) → FeCl3 (aq) + H2O (1)

You make the following measurements of an object: 42 kg and 22 m3. What would the object's density be? Show your work for credit and include final units

What is the tiny structure inside a cell

cells that perform a specific function in an organism A. are all the same B. can survive on their own C. are specialized D. perform all of the functions

How many grams of P4O10 are produced if you burn 50.0 g of phosphorus with sufficient oxygen?

Describe the preparation of 2.00 L of 0.100 M glycine buffer, pH 9.0, from glycine and 1.00 M NaOH.

Reducing the volume of a contained gas by one third, while holding temperature constant, causes pressure to A. be decreased by two thirds. B. be increased by two thirds. C. be decreased by one third. D. be increased by one third

What is the percent mass/volume of a solution having a mass of 65.00 grams and a volume of 600ml

This element has 3 electrons in its Lewis dot structure and is in the 3p orbital section.