a solar water bag can be used to heat water for an outside swimming pool. A student wanted to find out if the colour of the solar water bag affects the temperature increase of the water inside the bag. (black bag, pale blue bag, pale green bag, white bag) 1. fill each bag with water 2. place the four bags on the ground outside 3. after three hours, measure the temperature of the water inside each bag 4. repeat steps 1-3 on the next two days. (a) suggest three changes the student should make to this method to get valid results.​

newton's first law of motion

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.