Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chemical Reactions

Definitionsn and Important Questions

QuestionAnswer
physical change definition + characteristic process in which no new substance is created+ usually not easy to reverse
examples of physical change jelly setting in freezer, grating cheese, haircut, chopping inion, mixtures
exothermic process definition a process in which heat is given out to surrounding
why do you produce sweat (in exothermic context) if water evaporates on your body, it takes heat from body to change from liquid to gas. sweat uis produced for this reason- to cool you down.
exothermic process example water turning into ice: because the water loses heat to be able to turn into a solid
exothermic or endothermic: icicles melting Endothermic: is takes in heat from surroundings in order to melt
exothermic or endothermic: burning candle exo
exothermic or endothermic: animal respiring exothermic: when respiration energy is released into body!!
exothermic or endothermic: plants photosynthesising Photosynthesis is an endothermic reaction because in order for it to occur, the plants in which it occurs must absorb energy
exothermic or endothermic: rusting iron exothermic : heat is released
chemical reactions definition a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
three chemical indications -gas produced -colour change / cloudiness occurs -heat, sound, electricity produced
chemical reaction characteristics x3 -new substance formed (iron+air=iron oxide) -usually cannot be reversed (cake baking) -involves an energy change (firework)
why do glowsticks glow? when you first bend a glowstick, it releases a chemical from an inner capsule. this reacts with the other chemicals and causes the fluorescent dye to glow
chemical reaction examples egg making, cake baking, rusting, food digestion, when muscle cells release energy from digested food, firework
rusting experiment: conditions necessary for rusting -water and oxygen must be present for rusting to occur
rusting experiment: what should you do to the water before? boil it and cool. boiling it removes any oxygen dissolved in it
rusting experiment: why put oil ontop of water stops oxygen getting into water
rusting experiment: what chemical should be used for the contol? calcium chloride: removes moisture from air
reactants def reactants are the substances present before the chemical change takes place
products def the products of a substance that are formed by the end of the chemical reaction
vinegar+ baking soda = ? co2 + sodium acetate + water
photosynthesis equation carbon dioxide + water= glucose + oxygen
respiration equation glucose + oxygen= carbon dioxide + water
equation for when you light gas on a gas cooker methane+ oxygen = carbon dioxide + water vapour
Law of Conservation of Mass states that matter cannot be created or destroyed, but can only be changed from one form to another
what can we conclude from the law of conservation of mass? total mass of reactants= equal to the mass of the products
Activation energy is the minimum amount of energy needed to start a chemical energy
expale of activation energy hydrogen and oxygen mixed at room temperature will not create any new substance unless it is under a slame
reaction rates the speed of a reaction
what cause chemical reactions? molecules and atoms colliding
how is the particles present in the reactants affecting the reaction rate the more molecules of the reactants there are the more often the molecules will collide. the more energy the molecules have, the harder the collisions will be
Created by: grishmakandel12
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards