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Gre4nikov [31]
3 years ago
6

Any science fair project ideas? Something for 7th or 8th grade level.

Chemistry
2 answers:
evablogger [386]3 years ago
7 0
You can test the Stroop Effect!
MrRissso [65]3 years ago
4 0

Answer:

maybe try to do something with electricity?

Explanation:

give me an update on when u find one :) cant wait to see it

You might be interested in
WILL MARK BRAINLIEST
Helga [31]

Answer:

They all vibrate, but they all move differently.

Explanation:

Similarities: They all consist of particles and vibrate, just at different frequencies.

Differences: The particles in solids move slowly and vibrate. In liquids, they move a bit quicker and slide past one another. They will also take the shape of the container they're in. In gases, they move freely at high speeds and also taking the shape of the container.

Hope this helped! :)

3 0
4 years ago
Ethylene glycol is used as an antifreeze in car. if 400 g of ethylene glycol is added to 4.00 kg of water, what is the molaity?
Illusion [34]
Data:

solute: ethylene glicol => not ionization

molar mass of ethylene glicol (from internet)  = 62.07 g/mol

solute  = 400 g

solvent = water = 4.00 kg

m =?

ΔTf = ?

Kf = 1.86 °C/mol

Formulas:

m: number of moles of solute / kg of solvent

ΔTf = Kf*m

number of moles of solute = mass in grams / molar mass

Solution

number of moles of solute = 400 g / 62.07 g/mol = 6.44 moles

m = 6.44 mol / 4 kg = 1.61 m <-------- molality (answer)

ΔTf = 1.86 °C / m * 1.61 m = 2.99 °C <---- lowering if freezing point (answer)
8 0
3 years ago
Given the reaction represented by the balanced equation:
user100 [1]

Answer:

mass of CHF_3 = 1/3 \times 9.47 \times 70 =220.97g

Explanation:

CH_4(g)+3F_2(g)->3HF(g)+CHF_3

As given in the question that methane(CH_4) is taken excess amount

mass of CHF_3 depend only on mass of fluorine

mass of F_2 =180 g

mole of F_2=\frac{180}{19} =9.47

3 mole of F_2 gives 1 mole of CHF_3

so 1 mole will give \frac{1}{3} mole of CHF_3

therefore,

9.47 mole of F_2 will give \frac{1}{3}  \times 9.47 mole of CHF_3

mass of CHF_3 = 1/3 \times 9.47 \times 70 =220.97g

7 0
3 years ago
What is the chemical formula for one base that does not contain OH-
andre [41]
NH3

(ammonia is a weak base)

Hope that helps
5 0
3 years ago
Which of these describes chemical reaction <br><br> The color of he substance
geniusboy [140]

The color of a substance is correct, also if the substances starts to bubble describes a small portion of a chemical reaction.

6 0
4 years ago
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