Term
| Name a food that requires the additon of heat to prepare? |
|
Definition
|
|
Term
| Name a food that requires the removal of heat to prepare? |
|
Definition
|
|
Term
| Matter is often described by it characteristics, or ? |
|
Definition
|
|
Term
| Name and describe the two different properties of matter? |
|
Definition
Physical Properties - characteristics of a substance that can be observed without changing the substance into another substance.
Chemical Properties - characteristics of a substance that describes its ability to change into another substance |
|
|
Term
| The temperature at which a substance melts is a ______ |
|
Definition
|
|
Term
| Name 4 other physical properties of matter |
|
Definition
color
texture
density
conductivity |
|
|
Term
| Name and describe the two types of changes in matter |
|
Definition
Physical Change - any change that alters the form or appearance of a substance but does not change into another substance.
Chemical Change - a change in matter that produces one or more new substances |
|
|
Term
| Name some examples of Physical changes |
|
Definition
cut an apple in half
bending
crushing
change of state |
|
|
Term
| Why does a cut apple turn brown |
|
Definition
| compounds in the apple react with oxygen in the air to form new compounds |
|
|
Term
| What is another name for a Chemical Change |
|
Definition
|
|
Term
| What happens during a chemical change |
|
Definition
the atoms rearrange to forms new substances.
it also has new physical properties |
|
|
Term
| Give two examples of chemical changes |
|
Definition
|
|
Term
| Substances that undergo the chemical changes are called ___________ |
|
Definition
|
|
Term
| The new substances that form are called ______ |
|
Definition
|
|
Term
| What is the essential difference between a physical change and a chemical change? |
|
Definition
| In a chemical change you get a new substance. |
|
|
Term
Label the reactants and the products in the following chemical equation
Mg + O -> MgO |
|
Definition
Mg + O -> MgO
(reactants) (product) |
|
|
Term
| Name some physical properties of Magnesium Oxide |
|
Definition
|
|
Term
| How can you tell when a chemical reaction occurs? |
|
Definition
| Chemical Reactions involve change in properties and changes in energy that you can often observe |
|
|
Term
| Name some physical properites of oxygen |
|
Definition
| gas / colorless / odorless |
|
|
Term
| Name some physical properties of the metal magnesium |
|
Definition
| shiny / bendable / conducts with heat and electricity / metal |
|
|
Term
| ___________, ____________, and ____________ are all possible evidence that a chemical reaction has taken place. |
|
Definition
| Precipitate, Gas Production and Color Change |
|
|
Term
| Name two other physical properties that may change during a chemical reaction |
|
Definition
|
|
Term
|
Definition
| A solid that forms from liquids during a chemical reaction |
|
|
Term
| How do we know a gas has been produced during a chemical reaction involving liquids |
|
Definition
|
|
Term
| What evidence is in a slice of bread show the presence of gas? |
|
Definition
|
|
Term
| Is boiling water a chemical of physical change... Explain. |
|
Definition
| Physical Change - the water is just changing state |
|
|
Term
| Is color change always an indicator that a chemical change has taken place.. Explain. |
|
Definition
No, color change may be a physical change too.
Example: paint your pencil black = physical
Burning your pencil until it turns black is a chemical change |
|
|
Term
| Chemical reactions occurr when ________ and ________ form. Breaking bonds ________ energy, while forming bonds ____________ entergy. |
|
Definition
existing bonds
new bonds
aquires
releases |
|
|
Term
| What is a exothermic reaction |
|
Definition
| A reaction is when energy is released as the products form is greater than the energy required to break the bonds releases heat |
|
|
Term
| In an exothermic reaction, the energy is usually released as ___________. |
|
Definition
|
|
Term
| Name an exothermic reaction |
|
Definition
| When something burns it releases energy in the form of heat and light |
|
|
Term
| What is an endothermic reaction |
|
Definition
| When more energy is required to break bonds of the reactants than is released by the formation of the product |
|
|
Term
| Where is the entergy absorbed from and what does it cause |
|
Definition
| Energy is absorbed from nearby matter and it causes the surroundings to become cooler |
|
|
Term
| Name an endothermic reaction |
|
Definition
| Baking soda and Vinegar - baking a cake |
|
|
Term
| What is a chemical equation |
|
Definition
| a way to show a chemical reaction using symbols instead of words |
|
|
Term
| What is a chemical formula |
|
Definition
| a combination of symbols that represents the elements in a compound |
|
|
Term
| In CO2 what is the 2 called and what does it tell you |
|
Definition
| the subscript, it tells you how many atoms of oxygen is in the formula |
|
|
Term
| What does a chemical equation tell you |
|
Definition
| the substances you start with in a reaction and the substances formed at the end. |
|
|
Term
| In a chemical formula what does the arrow mean |
|
Definition
|
|
Term
| In a chemical equation ___________ are on the right side of the arrow and ___________ are on the left side of the arrow |
|
Definition
|
|
Term
| Who developed the law of conservation of mass |
|
Definition
|
|
Term
| What is the law of conservation of mass |
|
Definition
| states that during a chemical reaction, matter is not created or destroyed |
|
|
Term
| Can atoms be created or destroyed during a chemical reaction ... Explain |
|
Definition
| No, all of the atoms present at the start of the reaction are present at the end of the reaction. Atoms are not created or destroyed, they just rearrange to form new substances |
|
|
Term
|
Definition
| In an open system matter can enter or escape the system |
|
|
Term
|
Definition
| In a closed system, matter does not enter or leave |
|
|
Term
| The idea of conservation of mass means that the total number of atoms of each element in the reactants must ________________________________ |
|
Definition
| Equal the total number of each element in the product |
|
|
Term
|
Definition
| A large number placed in front of chemical formula in a equation |
|
|
Term
| How many atoms of each element? 2CO,2CO2,2H2O |
|
Definition
2 carbon atoms / 2 oxygen atoms
2 carbon atoms / 4 oxygen atoms
4 hydrogen atoms / 2 oxygen atoms |
|
|
Term
| An _____________ is an example of a fast chemical reation and ___________ is an example of a slow chemical reation. |
|
Definition
|
|
Term
| What factors can affect the rate of a chemical reation |
|
Definition
| Surface area, temperature, concentration, or the presence of catalysts and inhibitors |
|
|
Term
| How does surface the area of a substance affect the rate of a chemical reaction |
|
Definition
| Only the particle on the surface of a substance come in contact with the reactants so if you break the substance into smaller particles more surface area is exposed and the reaction happens faster |
|
|
Term
| How does temperature affect the rate of a chemical reation |
|
Definition
| When you heat a substance the particles move faster with more energy and it helps the reactant start faster, when you cool a substance it slows down the reaction |
|
|
Term
| How does concentration affect the rate of a chemical reaction |
|
Definition
| Increasing the concentration supplies more particles to react. |
|
|
Term
| What is a catalyst and how does it affect a chemical reaction |
|
Definition
| A catalyst increases the reaction rate by lowering the energy needed to start the reaction |
|
|
Term
| What is an inhibitor and how does it affect a chemical reaction |
|
Definition
| A material used to decrease the rate of a chemical reaction |
|
|
