Which answer below correctly identifies the type of change and the explanation for the heating of copper sulfate pentahydrate?
1) physical change because even though the change caused the temperature of the copper sulfate pentahydrate to increase, the compound’s physical properties remained exactly the same
2)physical change because even though gas formation was observed, the copper sulfate pentahydrate was undergoing a state change, which means that its properties are preserved
3)chemical change because gas formation was observed along with a color change, which indicated that the copper sulfate pentahydrate was transformed into a different substance
4)chemical change because a temperature change was observed, which indicated that the copper sulfate pentahydrate was transformed into a different substance

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

1. the materials manager for a billiard ball maker must periodically place orders for resin, one of the raw materials used in producing billiard balls. she knows that manufacturing uses resin at a rate of 50 kilograms each day, and that it costs $.04 per day to carry a kilogram of resin in inventory. she also knows that the order costs for resin are $100 per order, and that the lead time for delivery is four (4) days.2. at what point should resin be reordered? a. 0 kilograms remainingb. 50 kilograms remainingc. 200 kilograms remainingd. 400 kilograms remaininge. 500 kilograms remaining3. if order size was 1,000 kilograms of resin, what would be the length of an order cycle? a. 0.05 daysb. 4 daysc. 16 daysd. 20 dayse. 50 days4. if the order size was 1,000 kilograms of resin, what would be the average inventory level? a. 50 kilogramsb. 200 kilogramsc. 500 kilogramsd. 800 kilogramse. 1,000 kilograms5. if the order size was 1,000 kilograms of resin, what would be the daily total inventory costs, excluding the cost of the resin? a. $5b. $10c. $20d. $25e. $40

Most of the volume of an atom is occupied by the