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Tanya [424]
2 years ago
12

I need help 7th grade science

Chemistry
1 answer:
MrRissso [65]2 years ago
7 0

Answer:

a flowing stream

Explanation:

.........

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A single paper clip weighs about one gram. So 10 paper clips would weigh?
GREYUIT [131]
About 10 grams

1 x 10= 10 or 1:1 > 10:10
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3 years ago
Seafood Watch has made several unsustainable fishing practices illegal. true or false
zysi [14]

Answer:

True

Explanation:

As per the standards of fishing outlined by Seafood watch, fishing related to endangered species , threatened species, over fished or depleted species has been restricted to allow these fishes to recover otherwise they may become extinct. Catching of mammals, sharks, finish, turtles, shellfish  etc. have been strictly restricted . Not only this several fishing practices have also been restricted such as sea floor netting , Night setting , Side setting, Line shooter and mainline  tension, bait caster, live  bait, thawing bait  etc.

6 0
3 years ago
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If the molar heat of combustion of liquid benzene at constant volume and 300k is -3272KJ. Calculate the heat of combustion at co
vladimir2022 [97]

Answer:

The heat at constant pressure is -3,275.7413 kJ

Explanation:

The combustion equation is 2C₆H₆ (l) + 15O₂ (g)  → 12CO₂ (g) + 6H₂O (l)

\Delta n_g = (12 - 15)/2 = -3/2

We have;

\Delta H = \Delta U + \Delta n_g\cdot R\cdot T

Where R and T are constant, and ΔU is given we can write the relationship as follows;

H = U + \Delta n_g\cdot R\cdot T

Where;

H = The heat at constant pressure

U = The heat at constant volume = -3,272 kJ

\Delta n_g = The change in the number of gas molecules per mole

R = The universal gas constant = 8.314 J/(mol·K)

T = The temperature = 300 K

Therefore, we get;

H = -3,272 kJ + (-3/2) mol ×8.314 J/(mol·K) ×300 K) × 1 kJ/(1000 J) = -3,275.7413 kJ

The heat at constant pressure, H = -3,275.7413 kJ.

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<span>the behavior of the above pair of substances</span> is soluble

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3 years ago
A compound contains only carbon, hydrogen, and oxygen. Combustion of 10.68mg of the compound yields 16.01 mg CO2 and 4.37 mg H2O
Zielflug [23.3K]
<span>Molecular formulas tell you how many atoms of each element are in a compound, and empirical formulastell you the simplest or most reduced ratio of elements in a compound. ... Also, many compounds with different molecular formula have the same<span>empirical formula</span></span>
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3 years ago
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