6.5D Formation of a New Substance/Review for Test

If we have any substance, it can be concluded that a chemical change has happened if - 

• there is a color change
• the state of matter changes
• there is a decrease in mass
• the matter is stirred thoroughly 

Which of the following situations provides evidence that a chemical change has taken place?

• Water, when boiled, evaporates and turns in vapor
• Sugar, when added to ice tea, dissolves into liquid
• Two liquids are mixed, and a solid substance forms
• A piece of paper is cut into small small pieces

Which of the following would indicate the formation of a new substance?

• A liquid turns to a solid
• A sample of metal melts
• Bubbles and fizzing occur
• A solid dissolves in a liquid

A student notices that sugar, when heated over a flame, turns black. How does the student know that a new substance is being formed?

• The temperature of the sugar increases
• The color of the sugar changes to black
• Sugar began to melt within the test tube
• Sugar started as white crystals

Which of the following characteristics is shared by all chemical reactions?

• Produce a precipitate
• Show a color change
• Release heat energy
• Form new substances

All of the following are evidence of a chemical change EXCEPT -

• Change in state of matter
• Formation of a gas
• Unexpected color change 
• Precipitate forms

Slicing fruit is an example of - 

• A physical change
• A chemical change

Making Chocolate milk is an example of 

• A physical change
• A chemical change

A silver metal and blue gas combine and form a white solid. What evidence supports that a chemical reaction occurred? 

• There was a color change
• There was a temperature change
• Solubility occured
• A liquid formed

A students finds an object and doesn't know that it is. What could he do to help identify the unknown material?

• Measure its length and compare it to other substances
• Find its mass
• Find its density and compare it to other materials
• See if it sinks or floats