Give a counter for each mass noun.
1.2jars of cotton
22flower fots of soil
3 3grams of gravel
4 4bottles of vinegar
5.5plates of pasta
6.6buckets of sand
7.7 pieces of trash
8.8pounds of wood
9.20 kilograms of cement
10.10bottles of juice
The launch of the ship took a lot of energy but eased as they sped through the atmosphere and into space. The ship has a solid structure with a smooth interior surface. Buttons and lights blinked on and off and the beeping sounds filled the ships. The best feature of the ship was the monitor that measured the relative closeness of things within the solar system from the ship. With the rotation of the ship the monitor would move as well. With these things, the astronauts were ready for their long voyage into deep space.
Question
Solder is a silver metal used to hold pipes together when the solder is heated it melts and acts as a type of metal glue. Mrs. Hanley heats a piece of solder until it melts between two pipes what best identifies the point at which a physical change first takes place?
A) when the solder melts
B) when the solder cools down
C) when the solder is a soft metal
D) when the solder becomes solid again
Answer:
The correct answer is A)
Explanation:
The question is a good one. It asks to know when the PHYSICAL change first takes place. It means that it is possible to have changes to the Solder that is not immediately visible to the eye.
When any object is heated, its molecules vibrate even faster causing the bonds holding them to expand. This invariably leads to an expansion of the object. In the case of metals, metals when heated to a degree can actually become liquid.
The solder in this case has expanded before it melts. The melting is however easy to see more than the expansion of the molecules that make up the metal.
Metals when they melt do not assume the shape they were prior. When they cool off, they become as strong as they were before thus the binding quality of the solder in this case. However, they can only take the shape of the container they are poured into or the shape they were melted into if it was not containerized.
Cheers
