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vredina [299]
1 year ago
12

Which option contains a correct statement about the size of

Chemistry
1 answer:
Vinil7 [7]1 year ago
5 0

Answer:

a molecule always has two or more atoms

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Please answer 11 and 12, I'm not sure of my answers and I'm gonna be tested on this tomorrow. Thanks!
Novay_Z [31]
11. I would say physical because the color of the item is changed and the texture and density is changed aswell.
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3 years ago
According to the Periodic Table of Elements, Calcium has:
lana [24]

Answer:

20 protons and 20 electrons

Explanation:

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Which statement is true for a pure compound<br> but NOT true for a pure element?
amid [387]
A pure compound contains many elements.
5 0
3 years ago
(6 points) Alice owns 20 grams of a radioactive isotope that has a half-life of ln(4) years. (a) Find an equation for the mass m
Cloud [144]

<u>Answer:</u> The equation to calculate the mass of remaining isotope is [A]=\frac{20}{10^{-0.217t}}

<u>Explanation:</u>

The equation used to calculate rate constant from given half life for first order kinetics:

t_{1/2}=\frac{0.693}{k}

where,

t_{1/2} = half life of the reaction = \ln 4=1.386yrs

Putting values in above equation, we get:

k=\frac{0.693}{1.386yrs}=0.5yrs^{-1}

Rate law expression for first order kinetics is given by the equation:

k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}

where,

k = rate constant = 0.5yr^{-1}

t = time taken for decay process

[A_o] = initial amount of the sample = 20 grams

[A] = amount left after decay process =  ? grams

Putting values in above equation, we get:

0.5=\frac{2.303}{t}\log\frac{20}{[A]}

[A]=\frac{20}{10^{-0.217t}}

Hence, the equation to calculate the mass of remaining isotope is [A]=\frac{20}{10^{-0.217t}}

6 0
3 years ago
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