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alisha [4.7K]
3 years ago
13

What property of water is primary for living organisms? (SC.6.E.7.4) *

Chemistry
2 answers:
Viefleur [7K]3 years ago
4 0

Answer:

It is liquid at most temperatures on Earth.

joja [24]3 years ago
3 0
Answer: it is liquid at most temperatures on earth.

Step-by-step explanation:
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How long does it take the sun to melt a block of ice at 0∘c with a flat horizontal area 1.0 m2 and thickness 1.8 cm ? assume tha
VLD [36.1K]
This is a problem involving heat transfer through radiation. The solution to this problem would be to use the formula for heat flux.

ΔQ/Δt = (1000 W/m²)∈Acosθ

A is the total surface area:
A = (1 m²) + 4(1.8 cm)(1m/100 cm)(√(1 m²))
A = 1.072 m²

ΔQ is the heat of melting ice.
ΔQ = mΔHfus
Let's find its mass knowing that the density of ice is 916.7 kg/m³.
ΔQ = (916.7 kg/m³)(1 m²)(1.8 cm)(1m/100 cm)(<span>333,550 J/kg)
</span>ΔQ = 5,503,780 J

5,503,780 J/Δt = (1000 W/m²)(0.05)(1.072 m²)(cos 33°)
<em>Δt = 122,434.691 s or 34 hours</em>

4 0
3 years ago
Which of the following blackbody curves is representative of stars like our Sun?
Xelga [282]

Answer:

its letter b

Explanation:

it represents the spectrum of stars

3 0
3 years ago
If you heat your melting point tube too quickly, what will your observed melting point be in comparison to the actual melting po
solniwko [45]

Explanation:

When conducting a melting point experiment, if we were to heat a sample quickly. Large amount heat is provided instantly which would melt the crystals in the tube very quickly, even before the temperature of the thermometer reaches to that level. So the observes melting point would be much lower than the actual melting point when sample is heated slowly.

5 0
3 years ago
Write the symbol for the missing reactant.
Tcecarenko [31]

There is a shortcut trick while doing such fill in the blanks of nuclear reactions of hydrogen and helium

Let a,b,care elements of set N

\\ \rm\Rrightarrow {}^{a}_1 H+{}^b_1H={}^c_2He\dots

  • Here c must be a+b+1

Now

for our question

  • c=4
  • a=3

Hence b=4-3+1=1+1=2

So

The missing place should b e deuterium of heavy water

In nuclear reactions energy is released so it's mentioned on product side not reactant side

5 0
2 years ago
(PLEASE HELP DUE TODAY!) A gas has a volume of 1000.0 mL at a temperature of 20.OK and a pressure of 1.0 atm. What will be the n
Nataliya [291]

Answer:

4 L or 4000 mL

Explanation:

This question asks for the use of combined gas law:

(P1)(V1) / (T1) = (P2)(V2) / (T2)

...where pressure (P) is in atm, volume (V) is in liters, and temperature (T) is in kelvin.

1000 ml is 1 L, and everything else is already in the right units.

(1 atm)(1 L) / (20 K) = (0.5 atm)(V2) / (40 K)

Just solve the equation for V2, and you get a new volume of 4 liters

(1)(1) / (20) = (.5x) / (40)

1 / 20 = .5x / 40

2 = .5x

x = 4

7 0
2 years ago
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