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Foundation of chemistry-2
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Which method can be used to separate a mixture of iron fillings, sand and sugar?
magnet, dissolve sugar in water, filtration, evaporation
Name 3 signs of chemical change.
change in odor, color, energy, temperature, and bubbles formation
List three factors that affect the rate of a chemical reaction.
Temperature, concentration, surface area, pressure, catalyst
Based on the law of _____________, during physical and chemical changes, mass is not changed.
conservation of mass
What kind of mixture is the air in Hanoi?
heterogeneous mixture
Balance this equation.
1,2,1,2
A matter's temperature will stay the same during a change of state. (True or False)
True
Name the 2 types of matter.
Substances and mixtures
Why does the powdered form of a solid metal react faster with an acid than a bar of solid metal?
More total surface area, therefore more space available for reactants to collide.
New substances formed during a chemical reaction are called _________.
products
Which curve indicates the boiling point?
DE
________ is anything with mass and takes up space.
Matter
The number of __________ in an atom determines the identity of the element.
protons
Which type of substance is the table salt?
compound
The type of substance with atoms of two or more different elements chemically bonded together is called a(n) __________.
compound
The amount of matter in an object is called the _______.
mass
What happens to the motion of particles when you remove thermal energy?
The particles will move more slowly.
______ is the change from a gas directly to a solid.
Deposition
________ ________ is a characteristic of matter that can be observed as it changes to a different type of matter.
Chemical property
________ ________ is the temperature at which a solid turns to liquid.
Melting point
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