Chemical and Physical Changes
What is the smallest unit of matter that retains the properties of an element?
What is an atom?
Baking bread is an _____________ reaction.
What is endothermic?
What makes a chemical equation balanced?
What is an equal number of atoms on both sides of the equation?
What happens to the particles in a gas when the temperature increases?
What is they spread out and speed up?
Which statement about atoms is TRUE?
What is Answer D?
What happens to atoms during a chemical reaction?
What is "they are rearranged"?
Iron rusting is an example of a _______________ reaction.
What is an exothermic reaction?
How many total atoms are in one molecule of H2SO4?
What is 7?
In a solid, what best describes the motion of particles when heat is added?
What is they vibrate faster?
What is the main difference between elements and compounds?
What is "elements have only one type of atom and compounds have more than one type of atom"?
What is the primary evidence that a chemical reaction has occurred?
What is a change in color, gas formation, or temperature change?
Melting Ice is an example of a ___________ reaction.
What is an endothermic reaction?
What's wrong with this equation: H2+O2→H2O?
What is the equation is unbalanced?
Which change would cause gas particles to slow down their movement?
What is Answer C?
Cereal, Soup, and trail mix are all examples of _______________________________.
What is heterogenous mixtures?
What are the two types of chemical reactions?
What is endothermic and Exothermic?
Photosynthesis is an example of a ____________ reaction.
What is an endothermic reaction?
What's the total number of atoms in Ca3(PO4)2?
What is 13?
When pressure is increased on a gas in a sealed container, what happens to the particles?
What is They move closer together and collide more frequently?
Lemonade, air, and steel are all examples of ___________________________.
What is homogenous mixtures?
During a chemical reaction, Mass is ______________.
What is conserved?
Cellular Respiration is an example of a _______________ reaction.
What is an Exothermic reaction?
In the formula Al2(SO4)3, how many oxygen atoms are present?
What is 12 ?
What an object has more molecules packed tightly together, it is considered more ____________ than something with less molecules packed together. Warm things are _________ _____________ than cold things.
What is dense? What is less dense?
Molecules must have ___________ or more ____________ to be considered a compound.
What is 2 ? What is elements?