1. the following reaction does not proceed to form a product: h2o + > no reaction. why is that?
a) gold has a higher activity than hydrogen and cannot replace it.
b) gold has a lower activity than hydrogen and cannot replace it.
c) the reaction cannot occur because water is a reactant.
d) the reaction proceeds too slowly to create products.
2. which of the following is the balanced form of the equation c2h6 + o2 --> co2 + h2o?
answer choices are attached a, b,c, d top to bottom
3. the equation 2nano3 + cacl2 > 2nacl + ca(no3)2 is balanced. how many atoms of sodium (na) are there on either side of the equation?
a) one
b) two
c) four
d) six
4. all single-displacement reactions can be classified as another type of reaction as well. what type of reaction is that?
a) combustion
b) redox
c) synthesis
d) decomposition
5. if ions change places and a gas is formed, then what type of reaction is indicated?
a) double-displacement
b) synthesis
c) decomposition
d) single-displacement

1. B
The positive charge in water is provided by hydrogen, and gold provides the same charge. However, gold is not more reactive than hydrogen so it can not replace it in the compound.

2. In order to balance the equation, you must sure there are equal moles of each element on the left and right side of the equation:
2C₂H₆ + 7O₂ → 4CO₂ + ₆H₂O

3. The number of moles of sodium atoms on the left of the equation must be equal to the number of moles of sodium atoms on the right, as per the law of conservation of mass. The answer is B.

4. C.
A synthesis reaction usually results from single displacement because some element or compound is produced in its pure form

5. B. 
The gas being produced is being synthesized.

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different.  let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones).  now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first.  for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours.  so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia. 

Nonmetal are moldable and easily shaped