3 years ago

Atom is anything that has mass and occupies space. True or false

Chemistry

1 answer:

rosijanka [135]3 years ago

4 0

Answer:

False.

Explanation:

Matter is anything that has mass and occupies space, not atoms.

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Answer: option B. there are 35 mg of lead in 1.0 L of this solution

Explanation:

1ppm = 1mg/L

Therefore 35ppm = 35mg/L

So, the solution contains 35mg of lead in 1L of the solution

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A 7.0 L sample of gas begins at 2.5 atm and 320. K. What is the new pressure if the temperature is changed to 273 K and the volu

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Answer:

2.1 atm

Explanation:

We are given the following variables to work with:

Initial pressure (P1): 2.5 atm

Initial temperature (T1): 320 K

Final temperature (T2): 273 K

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We are asked to find the final pressure (P2). Since volume is constant, we want to choose a gas law equation that relates initial pressure and temperature to final pressure and temperature. Gay-Lussac's law does this:

$\frac{P_{1}}{T_1} =\frac{P_{2}}{T_2} \\$

We can rearrange the law algebraically to solve for $P_{2}$ .

${P_{2}} =\frac{(T_2)(P_{1} )}{T_1} \\$

Substitute your known variables and solve:

$P_2 = \frac{273K(2.5atm)}{320K} = 2.1 atm$

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