How much force would it take to stop a 100-kg football player if he declerates at 20 m/s^2

When using a crucible and lid, why must the crucible and lid be inspected for cracks before using?

Classify each of the following changes as Physical or Chemical: (a) Condensation of steam (b) burning of gasoline (c) souring of milk (d) dissolving of sugar in water (e) melting of gold

A neutral atom possesses an number of 13 and an atomic mass of 27. three electrons are lost. from what region of the atom are they lost? A. Outside the atom B. Outside the nucleus C. inside the nucleus D. both inside and outside the nucleus

Identify the compound with the highest percent ionic character. identify the compound with the highest percent ionic character. hf hcl ibr lif

Nitrogen can ionically bond with an unknown element X from group 2. How many ions of element X are required to create a stable ionic compound with nitrogen? A) 2 B) 3 C) 4 D) There is not enough information.

What are the three requirements for an effective collision

What is the force applied when using a simple machine.

Select all that apply. when the products of a reaction have more energy than the reactants: the reaction is exothermic. the reaction is endothermic. the reactants gave up energy. the δh is positive.

How can you determine the number of valence electrons in an atom of a representative element?

Find the cube root of 2.7*10^10