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Semmy [17]
3 years ago
15

What is the dependent and independent variable

Chemistry
1 answer:
sukhopar [10]3 years ago
5 0
An independent variable is the variable changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.
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What are some changes that can be caused by sound energy? by electromagnetic energy?
Pavel [41]

Hearing loss due to sound energy damaging the nerve cells in the inner ear. Many animals behavior is influenced by sound energy. They learn to associate events with sounds, so they run when something crunches in the dry grass (might be a coyote), but won't be bothered by the sound of a waterfall. Mood is affected by sound energy. A wine glass can break with sound energy, if the frequency matches the resonant frequency of the wine glass and the amplitude is great enough (one Mythbusters show featured a professional singer who broke a wine glass with his voice without any amplification).

5 0
3 years ago
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Which of the following is an asteroid? A: A shooting star B: A big chunk of space rock C: A small comet D: A small meteor
lora16 [44]

Answer:

B: A big chunk of space rock

Explanation:

asteroids are basically known as minor planets.

whereas shooting star is some dust burning while entering earths atmosphere.

on the other hand comet is some icy material consisting of gases.

and meteor is a very very small rocky or metallic body.

7 0
4 years ago
What substance is not soluble in water, is derived from animal-based foods and synthesized by the body, and while circulating in
erma4kov [3.2K]

Answer:

D) saturated fat

Explanation:

Saturated fat -

It is a form of fat , where saturation is present , i.e. , presence of single bonds , it is a type of very unhealthy fat .

Butter , red meat , coconut oils and palm are rich in saturated fat , and are mostly in solid state at room temperature .

These fats often tends to be collected in the walls of arteries , and ,  can act as a restriction to the flow of blood .

Hence , the correct option for the given information of the question is saturated fat .

5 0
3 years ago
Using a molar heat of combustion of hexane (C6H14) –4163 kJ/mol, the mass of hexane required to increase the temperature of 1.76
pshichka [43]

Answer:

7.46 g.

Explanation:

  • Firstly, we need to calculate the amount of heat needed to warm 5.64 kg of water from 21.0°C to 70.0°C using the relation:

<em>Q = m.c.ΔT,</em>

where, Q is the amount of heat absorbed by water (Q = ??? J).

m is the mass of water <u><em>(m: we will determine).</em></u>

c is the specific heat capacity of water (c = 4.186 J/g.°C).

ΔT is the temperature difference (final T - initial T) (ΔT =  70.0 °C - 21.0 °C = 49.0 °C).

  • To determine the mass of 1.76 L of water we can use the relation:

mass = density x volume.

density of water = 1000 g/L & V = 1.76 L.

∴ mass = density x volume = (1000 g/L)(1.76 L) = 1760.0 g.

∵ Q = m.c.ΔT

<em>∴ Q = m.c.ΔT </em>= (1760.0 g)(4.186 J/g.°C)(49.0 °C) = 360483.2 J ≅ 360.4832 kJ.

  • As mentioned in the problem the molar heat of combustion of hexane is - 4163.0 kJ/mol.

<em>Using cross multiplication we can get the no. of moles of hexane that are needed to be burned to release 360.4832 kJ:</em>

Combustion of 1.0 mole of methane releases → - 4163.0 kJ.

Combustion of ??? mole of methane releases → - 360.4832 kJ.

∴ The no. of moles of hexane that are needed to be burned to release 360.4832 kJ = (- 360.4832 kJ)(1.0 mol)/(- 4163.0 kJ) = 0.0866 mol.

  • Now, we can get the mass of hexane that must be burned to warm 1.76 L of water from 21.0°C to 70.0°C:

<em>∴ mass = (no. of moles needed)(molar mass of hexane)</em> = (0.0866 mol)(86.18  g/mol) = <em>7.46 g.</em>

5 0
3 years ago
Earthquakes cannot occur far away from pleat boundaries true or false
DochEvi [55]
False they still can as the shockwaves can be very strong
5 0
4 years ago
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