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shtirl [24]
4 years ago
15

Which substance is a pure substance? Cereal Silver Jelly bean Shampoo

Chemistry
2 answers:
Tju [1.3M]4 years ago
6 0

Silver?

Fun FACT : An apple, potato, and onion all taste the same if you eat them with your nose plugged

zalisa [80]4 years ago
4 0
The answer is silver
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Which of the following is a benefit of having a standard measurement system that can be used by scientists worldwide?
bonufazy [111]
2. Scientists can compare and share data with each other. 

By making use a standard measurement system scientists can accurately share data with one another and use this as the basis for further scientific research .

For example a scientist can further research an experiment by simply using a standard measurement or conversion to better or even perfect an experiment .
6 0
3 years ago
URGENT PLEASEEEE, WILL GIVE 100 POINTS
Amanda [17]

Let's balance

  • 2N_2O+3O_2---->4NO_2

Moles of laughing gas

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  • 0.2mol

2 moles need 3 mol O_2

1 mol needs= 1.5mol O_2

moles of O_2.

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#2

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3 0
2 years ago
Read 2 more answers
In a heat engine, if 500 J of heat enters the system, and the piston does 300 J of work, what is the final internal (thermal) en
jasenka [17]

Answer: The final energy is 1,700 J

Explanation: According to first law of thermodynamics:

\Delta U=q+w

\Delta U=U_2-U_1=Final energy-initial energy=Change in internal energy

q = heat absorbed or released

w = work done by or on the system

w = work done by the system=-P\Delta V  {Work done by the system is negative as the final volume is greater than initial volume}

q = +500J   {Heat absorbed by the system is positive}

w = work done by the system = -300J

U_2-1500J=+500J-300J

U_2=1700J

6 0
3 years ago
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True or false: Energy is always transferred from high kinetic energy (temperature) too low kinetic energy (low temperature)
Roman55 [17]

Answer:

true

Explanation:

Temperature is a measure of the average kinetic energy of the molecules, so energy would naturally be transferred from the molecules with more kinetic energy to the molecules with less kinetic energy

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Mrrafil [7]

Answer:

Nitrogen and Oxygen make up 99% of the Earths atmosphere. Then Argon makes up the rest of the atmosphere.

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3 years ago
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