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agasfer [191]
3 years ago
13

What is a cool 1 week or less science fair project for grade 9?

Chemistry
2 answers:
Nina [5.8K]3 years ago
5 0
How different genres of music affect animals. If you have any hamsters, fish etc you can separate them and expose them to different types of music for long periods of time and observe their behavior. Make sure u have a control group which isn't listening to music.
Leno4ka [110]3 years ago
3 0
Make a fizzing volcano with facts and pictures of a volcano
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What is the role of NaCl and EDTA in DNA isolation?
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<span>The following is the role of NaCl and EDTA in DNA isolation, hope it helps:

NaCl provides Na+ ions that will block negative charge from phosphates on DNA. Negatively charged phosphates on DNA cause molecules to repel each other. The Na+ ions will form an ionic bond with the negatively charged phosphates on the DNA, neutralizing the negative charges and allowing the DNA molecules to come together.</span>
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How many grams are in 7.9*10^-1 moles of argon
Dafna11 [192]

For moles to grams would be the mole which is 7.9*10^-1 times the molar mass of argon


3 0
4 years ago
Given: Pb(s) + PbO2(s) + 2H2SO4(l) → 2PbSO4(s) + 2H2O(l); ΔH° = –509.2 kJ SO3(g) + H2O(l) → H2SO4(l); ΔH° = –130. kJ determine Δ
enot [183]

ΔH° = -769.2 kJ is required.

<u>Explanation:</u>

Given equations are:

Pb(s) + PbO₂(s) + 2 H₂SO₄(l) → 2 PbSO₄(s) + 2H₂O(l);  ΔH° = –509.2 kJ ------1

SO₃(g) + H₂O(l) → H₂SO₄(l);  ΔH° = –130. kJ ----2

From the above 2 equations, by adding or subtracting or multiplying or dividing the required amount to get the final equation by means of Hess's law.

Multiplying eq. 2 by 2 we will get,

2 SO₃(g) + 2 H₂O(l) → 2 H₂SO₄(l) ;  ΔH° = -260 kJ ----3

Adding it to eq. 1 we will get,

Pb(s) + PbO₂(s) + 2 H₂SO₄(l) → 2 PbSO₄(s) + 2H₂O(l);  ΔH° = –509.2 kJ ------1

2 H₂SO₄ and 2 H₂O gets cancelled since they are on opposite sides, and the ΔH° values are added to get the ΔH° value of the required equation as,

Pb(s) + PbO₂(s) + 2 SO₃(g) → 2 PbSO₄(s)

ΔH° = -509.2 - 260 = -769.2 kJ

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3 years ago
when wax is heated, it turns into a liquid. how are the wax molecules affected by this change of state?
Vladimir [108]
Wax molecules have most of their weak van der waals interactions and other hydrophobic interactions decrease and thus most of them are broken between these lipid substances, allowing for the increased molecular movement of these substances. As there are fewer interactions between similar compounds.
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