Ｉ ｃａｎ ｓｅｎｄ ｍｏｒｅ, ｂｕｔ ｕ ｎｅｅｄ ｓｉｎｇ ｉｎ
ｙｏｕ ｋｎｏｗ ｗａｈｔ ｔｏ ｄｏ
ᵇʳᵃⁱⁿˡʸ.ᵗᵒᵈᵃʸ

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Which of the following units is not an official si unit? mole liter kilogram ampere