This experiment shows a closed system. What will that tell us about the mass of the two reactants and the product?
the mass of the two reactants will be the same as the ending mass
the mass of the two reactants will be different than the ending mass
What happens to food molecules eaten by humans?
the atoms are rearranged through chemical reactions to make new substances
the atoms are change into new types of atoms through chemical reactions
the atoms are copied to produce more atoms through chemical reactions
the atoms are used up by a chemical reaction to make energy
Will the properties of these two samples be the same or different?
different because there are more atoms in Sample 2
different because there are different types of atoms in each set
the same because each have a purple atom
the same because they are grouped into sets of 2
Vinegar in the beaker is mixed with baking soda inside the balloon. The balloon immediately inflates. Why?
a chemical reaction happened but no new substances were formed
a physical reaction has made the baking soda turn to gas
a physical reaction has turned the vinegar into gas
a chemical reaction has created a new substance that bubbles
What type of change has occurred based on the chart shown? How do you know?
This is a chemical change because the melting points are different
This is a chemical change because the solubility is different after mixing
This is a physical change because the masses are different after mixing
This is a physical change because the melting points are different
Will the properties of Sample 1 and 2 be the same or different?
the same because they are both gases
different because there are more atoms groups in sample 1
the same because the atoms are the same
different because the groups have different numbers of atoms