anonymous
  • anonymous
Please help!!! I will medal and fan :)
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
2 more questions to this please help!
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taramgrant0543664
  • taramgrant0543664
Which one do you think it is?
sweetburger
  • sweetburger
What was always the same in experiment even when another variable changed.

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anonymous
  • anonymous
I'm thinking C, I'm not really good with science.
Photon336
  • Photon336
The control something that isn't changed
Photon336
  • Photon336
they're testing the effects of cleaner on the growth of mildew. so think.. they use two cleaners, and they want to test the effectiveness of each, how would they know how effective they are if they didn't have a third group where no clearer is used?
Photon336
  • Photon336
so you need to think about what was kept constant in this experiment in terms of the control @sunflow1
anonymous
  • anonymous
Okay, so I think Brand X was kept constant because it was good for 3 days.
Photon336
  • Photon336
hmm. if i'm correct the the numbers correspond to the area as in the growth of mildew so for brand X you can see that for three days the mildew is virtually non-existent it's zero. but for brand Y there are values for three of the days so which one would be more effective?
anonymous
  • anonymous
Uhh Barnd Y... @Photon336
Photon336
  • Photon336
@sunflow1 think of it this way. the purpose of this experiment is that you want to see which brand is more effective at killing mildew. the brand that's more effective at killing mildew will be the one that has the lowest area in growth mm follow?
anonymous
  • anonymous
Yes. Sorry if I'm frustrating you.
Photon336
  • Photon336
no you're not; it's probably that I'm not explaining it clear enough
Photon336
  • Photon336
so we can see that BRAND X is the better cleaner than BRAND Y because the area in mm for the mildew for brand X is much less
anonymous
  • anonymous
Yes.
Photon336
  • Photon336
(note they said something else): " they made sure that they did the experiment on the same tiles"
anonymous
  • anonymous
yeah
Photon336
  • Photon336
why is this important?
anonymous
  • anonymous
It's Important because they want to make sure they are testing it right...im not sure.
Photon336
  • Photon336
yeah.. that's correct ( because if they used different tiles) then the mold might grow faster or slower depending on the tile and they want to make sure that they are testing it correctly/
Photon336
  • Photon336
so would that be our control?
anonymous
  • anonymous
Wait is a control a factor in an experiment that remains the same
Photon336
  • Photon336
yes that is correct
anonymous
  • anonymous
so that means it would be C
Photon336
  • Photon336
yeah that makes most sense to me the four days wouldn't be controls and the two sprays would be controls either so those are out.
anonymous
  • anonymous
awesome. Can you help with the last two? @Photon336
Photon336
  • Photon336
yeah
anonymous
  • anonymous
Ok. Here they are.
1 Attachment
Photon336
  • Photon336
let me ask you this question: what are we manipulating here in this experiment? @sunflow1
anonymous
  • anonymous
The tiles independent variable the one factor that a scientist changes during an experiment; also called manipulated variable
anonymous
  • anonymous
And I think its D..
Photon336
  • Photon336
I believe that it's the type of cleaner
Photon336
  • Photon336
because they used the same tiles remember?
anonymous
  • anonymous
yes, I kind of confused. :(
Photon336
  • Photon336
@sunflow1 what changes as a result of using a different cleaner?
anonymous
  • anonymous
the tiles?
Photon336
  • Photon336
it's the size of the mildew
anonymous
  • anonymous
Oh right, so it would be B bc the midew changes
anonymous
  • anonymous
Mildew*
Photon336
  • Photon336
so the size of the mildew depends on the cleanser used does that make sense and why?
anonymous
  • anonymous
Yes, because if the mildew grows and grows that means that type of cleanser isn't the kind you want to get. If its less mildew than its the type you would want, am i right?
Photon336
  • Photon336
yes perfect
Photon336
  • Photon336
so what would be the independent variable and what responds to it ( the dependent variable?)
anonymous
  • anonymous
The independent variable would be B?
Photon336
  • Photon336
independent variable = type of cleanser used dependent variable = growth of the mildew
Photon336
  • Photon336
does this make sense to you? if not let me know
anonymous
  • anonymous
Yes
anonymous
  • anonymous
Ok thank you so much
Photon336
  • Photon336
yeah last thing: Independent variable is what causes the other variable to change dependent variable. in our case the type of cleanser is what influences the growth of the mildew
Photon336
  • Photon336
once you've identified that relationship you can't get it wrong ever because that's really what it is at the core of it all.

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