The pair of elements with the most similar chemical properties are a. Na and F
b. O and Kr
c. Ne and Ar
d. Mg and Cl

A1,200 kg car is accelerated at 3.7 m/s2. what force was needed to produce this acceleration? a. 4,440 n b. 324.3 n c. 4,388 n d. 304.3 n

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

What is the coefficient of kinetic friction μk between the block and the tabletop?