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Valentin [98]
3 years ago
12

A student measures a cube composed of an unknown substance. The mass was determined to be 112.8 g, and the volume 63 cm3. What i

s the density of the cube? a) 0.6 cm3/g b) 1.8 g/cm3 c) 0.6 g/cm3 d) 1.8 cm3/g
Chemistry
1 answer:
irina [24]3 years ago
4 0

Answer:

D

Explanation:

The formula to find the density of an object is mass/volume. You know the mass in this problem is 112.8 grams, and the volume is 63 cm^3. Now you can plug this information into the density formula as 112.8/63, which is about 1.8. Now you just add the cm^3/g and you have your answer.

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A sample of liquid mercury is heated from 20°C to 40°C. Which measurement of the sample will increase during this process? volum
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3 years ago
Hurry PLEASE HELP!
avanturin [10]

B. 11,540

<h3>Further explanation </h3>

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

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\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}

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t 1/2 = half-life  

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Nt=25 g

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t1/2=5770 years

\tt 25=100\dfrac{1}{2}^{T/5770}\\\\\dfrac{1}{4}=\dfrac{1}{2}^{T/5770}\\\\2=T/5770\rightarrowT=11540~years

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