Based on the atoms, are these substances the same? Will the properties be the same or different?
Yes, and they will have different properties
Yes, and they will have the same properties
No, and they will have different properties
No, and they will have the same properties
Are these substances the same or different?
different
the same
Wood burning is an example of which change? Why?
Physical change b/c the ash can be turned back to wood
Chemical change b/c new properties were created when the wood burned
Chemical change b/c any time there is heat added to substances
Physical change b/c the wood changed from a solid to a gas due to heat
Which beaker below is showing signs of a chemical change?
Beaker 2 because everything is staying the same
Beaker 1 because there are several changes happening and bubbles formed
Beaker 1 because everything is staying the same
Beaker 2 because there are several changes happening and bubbles formed
Why does this picture show a chemical reaction has occurred?
there are the same number of molecules in pink and white
the atoms are arranged the same way and the total atoms remain the same
there are the same number of atoms in pink and white
the atoms are rearranged but the total atoms remain the same
This is H2O. Water is made of this repeating atom group. What would water look like under a microscope?
molecules of H and O that spread apart
all of the H and O atoms combined together
the molecules seen above but they do not have to stay in groups
repeating groups of the molecules seen above
Why are these substances different?
the atoms that make them up are the same so they have the same properties
the atoms that make them up are different so they have different properties
Oil and sodium hydroxide are combined to make soap and glycerol. The chart shows their solubility before and after.
This is a chemical change because the materials mixed have new solubility.
This is not a chemical change b/c dissolving in water is a physical change.
This is not a chemical change because they are all liquids.
This is a chemical change because the materials were mixed with water.