Joint replacement are often made of the element titanium. Which type of matter is titanium

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

What produces wave a)sound b) heats c)transfer of energy d)vibrations

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )