Astudent adds solution “x” to a beaker of water, instantly the student notices that the beaker becomes warm to the touch. which of the following best describes the type of reaction the student witnessed?

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

Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. a-if a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? b- what is the bearing's impact velocity?

Which of the following quantities is a scalar? i need plz someone !