True ot fauls 1. Precise measurements are all about the same.
2. In the number 6.300 the zeros aren’t significant.
3. To change a material from liquid to gas we need to increase its temperature.
4. Melting is the phase change from liquid to gas.
5. Water, without salt in it, is accurately described as pure.
6. Pure elements contain atoms of different atomic numbers.
7. 1 gram is equal to 1000 milligrams.
8. 1 gram of water has a volume of 1 cm3 meaning water has a density of 1 g/cm3.
9. Solutions can be filtered to separate the parts present.
10. The combination of materials with different properties is a mixture.

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's