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beks73 [17]
3 years ago
15

When two substances are mixed, they might form a new substance. Which of the following would indicate that a new substance has b

een formed?
Chemistry
1 answer:
sveticcg [70]3 years ago
4 0
Any chemical reaction such as combustion, oxidation, decomposition, cellular respiration, etc.
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You burn a 15g jellybean to warm 50 mL of water, which increases the temperature of the water 25 °C. How many calories of heat a
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Answer:

Q = 375\,cal

Explanation:

The quantity of heat transfered from the jellybean to the water is:

Q = \rho\cdot V \cdot c\cdot \Delta T

Q = \left(1\,\frac{g}{cm^{3}}\right)\cdot (15\,cm^{3})\cdot \left(1\,\frac{cal}{g\cdot ^{\circ} C} \right)\cdot (25\,^{\circ}C )

Q = 375\,cal

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3 years ago
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A gas occupies 49 liters at a pressure of 367 mm Hg. What is the volume when the pressure is increased to 784 mm Hg?
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Answer:

22.94 L.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

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R is the general gas constant,

T is the temperature of the gas in K.

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P₁V₁ = P₂V₂

P₁ = 367.0 mm Hg, V₁ = 49.0 L.

P₂ = 784.0 mm Hg, V₂ = ??? L.

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3 years ago
Jake hangs two balloons from a desk so that they are close together but not touching. Jake rubs one balloon with a wool cloth. H
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The objects that are rubbed together will create charges among themselves due to friction. 
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Name the two criteria that is used to determine if a substance is pure or not​
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Melting and Boiling Point Determination

The physical properties of a substance can be used to establish its purity. These properties include the melting point and boiling point. Different substances tend to have different melting and boiling points, and any pure substance will have a specific melting and boiling point.

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Is it normal to be pregnant in 8th grade (not me asking for a friend fr) and can you make a saliva baby or is like she lying to
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No normal but not unheard of. And I think she might be lying to you about the father if you have only exchanged saliva…
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