Matter
Define matter
What is anything that has mass and occupies space
List 3 chemical properties of matter
What are reactivity, combustibility, flammability, corrosion, toxicity, acidity, and radioactivity
Is rust an example of a chemical change? Explain.
What is YES? You cannot change rust back into the metal is was before; therefore, it is a chemical change.
Name at least 3 physical properties
What are...?
Define physical change.
What is physical change alters the form or appearance (like shape, size, or state of matter) of a substance but never its chemical composition
Types of matter from fastest to slowest.
What are PLASMA, GAS, LIQUID, & SOLID
Define chemical property.
What is chemical properties describe how matter changes into new substances during a chemical reaction, observable only when its composition alters
Name at least 2 indicators of a chemical change.
What are (a new substance forming) include a change in color, production of gas (bubbles/fizzing), formation of a precipitate (solid from liquids), a change in energy (heat/light/sound), or a new odor
Name 2 physical properties of ice.
What are cold, hard, solid, wet, etc.?
Is a melted popsicle an example of a physical change? Explain
What is YES? You can melt and refreeze a popsicle and it will still be a popsicle.
____________ particles are tightly packed and only vibrate in fixed positions, resulting in the slowest overall movement.
What is solid
Some butter melts and then burns in a hot frying pan. Which of these changes is chemical and why?
What is the burning is chemical because it is flammable?
___ is a unique substance formed when two or more different chemical elements chemically bond together in a fixed ratio
What is COMPOUND
Define physical property in science.
What is physical properties in science are characteristics of a substance (color, density, hardness, melting/boiling points, or conductivity) that can be observed or measured without changing the substance's chemical identity
Explain how water could be an example of a physical change.
What is freezing and melting water to and from ice is an example of a physical change?
What is DENSITY and what is the formula to calculate it?
What is density is how much mass is packed into a given volume AND the formula is d=m/v
If you spill household bleach on denim jeans, you will observe that the area of the spill no longer has a blue color. Explain why this is NOT chemical change.
What is the change is physical and not chemical because no new substances were presented after the bleach is completely cleaned up (the jeans are still jeans).
True or False. Turning peanuts to peanut butter is an chemical change.
What is FALSE? To make peanut butter, you grind up roasted peanuts, so nothing new is being created.
How can you observe a substance's physical properties?
What is by using your senses (sight, touch, smell) or tools to measure (like a thermometer for boiling point) without altering the substance
Is physical change usually reversable? Explain.
What is usually, yes (freezing and melting water), but some are irreversible, like tearing paper or chopping wood.
What is the difference between mass and weight?
Difference between chemical property and physical property?
What is
You mix two clear, odorless liquids in a beaker, and nothing seems to happen at first, but the beaker feels much colder, and later a solid (precipitate) forms at the bottom. Explain why this indicates a chemical change and how this differs from just dissolving sugar in water.
What is temperature change (beaker gets colder), precipitate (a new solid forms), new properties appear (it started as a clear liquid but ended as a cold solid)
What's the difference between physical and chemical properties?
What is physical properties (like color) are observed without changing what the substance is; chemical properties (like flammability) describe how it reacts to become something new.
Explain how the water cycle an example of a physical change.
What is it is a physical change because water changes from a liquid/solid when it precipitates, to a gas when it evaporates, then forms back into a liquid when it condensates. Then the process repeats again with the same substance, WATER!