What is 4 days 9h : 4

What of these processes is a chemical change, not a physical change? 1. the burning of a match 2. the boiling of mercury 3. the dissolving of salt in water 4. melting ice 5. the breaking of a pencil?

What is the formula for salt used for the green light in the fireplace

What is another name for the metric system? A) The Metric System B) The SI System C) The English System D) US customary system

If you compare the egg to a cell, what did you learn about how water moves into or out of a cell? What about salt water? Why does the water move in the direction it does?

What is an example of chemical weathering 1. acid rain falls on rocks 2. chemicals from plants on rocks 3. water reacting with minerals on rock 4. All

How many moles of nitrogen gas are in a 10.0 L container at STP? a. 0.45 moles b. 22.4 moles c. 10.0 moles d. 6.02 x 1023 moles

In your own words, explain John Martin s theory about iron dumping.

List four common signs that a chemical reaction has occurred.

How does water evaporate from: (different things)

The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures?