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3 years ago

Let's say you are sanding a rough board to make shelves for you bedroom. What type of weathering would this be? How do you know?

Chemistry

1 answer:

OlgaM077 [116]3 years ago

3 0

Answer:

Physical or Mechanical weathering.

Explanation:

The sanding is a physical transformation of the rough board to make shelves for the bedroom and thus includes wear and tear of the wood in order to make the set. Hence the process includes grinding, polishing and smoothing the surface to make it usable.

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How many chiral centres are there in warfarin molecule?

kolbaska11 [484]

I'm actually not sure... but maybe this will help!
http://www.dummies.com/education/science/chemistry/how-to-identify-chiral-centers-in-a-molecule/

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4 years ago

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What temperature in fahrenheit is 28 degrees below freezing?

babunello [35]

28 degrees below freezing would be 4 degrees

4 0

3 years ago

A 7.83 g sample of hcn contains 0.290 g of h and 4.06 g of n. find the mass of carbon in a sample of hcn with a mass of 3.37 g.

xeze [42]

To obey the Law of Conservation of Mass, the sum of all individual elements of a compound is equal to the mass of the compound. So, if HCN has a mass of 7.83 grams, then

7.83 g = mass of H + mass of C + mass of N

We know the masses of H and N to be 0.290 g and 4.06 g, respectively. Hence, we can find for the mass of C:

7.83 = 0.29 + mass of C + 4.06
mass of C = 3.48 g

As an extension to the Law of Conservation of Mass, there is also a Law of Definite Proportions. According to Dalton's atomic theory, a compound is formed from a fixed ratio of its individual elements. From our previous calculations, we know that the mass ratio of H to C to N is 0.29 g: 3.48 g:4.06 grams. The ratio could also be expressed in percentages. Let's find the mass percentage of Carbon in HCN to be used later:

mass % of Carbon = (3.48 g/7.83 g)*100
mass % of Carbon = 44.44%

So, if you collect a different mass of HCN, say 3.37 g, the corresponding mass of Carbon is equal to:

Mass of Carbon = (3.37)(44.44%)
Mass of Carbon = 1.498 g

3 0

4 years ago

A certain quantity of ammonium nitrite is separated into its polyatomic components, and each polyatomic ion is then carefully tr

just olya [345]

Answer:

5000

Explanation:

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3 years ago

Which of the following processes have a ?S > 0?

Ne4ueva [31]

Answer: Cesium chloride dissolves in pure water has $\Delta S$ > 0.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

a) $2HCl(g)\rightarrow H_2(g)+Cl_2(l)$

As 2 moles of gas are converting to 1 mole of gas and 1 mole of liquid, the randomness decreases and hence $\Delta S$ is negative.

b) $2NH_3(g)+CO_2(g)\rightarrow NH_2CONH_2(aq)+H_2O(l)$

As gas molecules are converting into aqueous and liquid form, the randomness decreases and hence $\Delta S$ is negative.

c) lithium fluoride forms from its elements: $2Li+F_2\rightarrow 2LiF$

As elements are combining to form a compound, the randomness decreases and hence $\Delta S$ is negative.

d) Cesium chloride dissolves in pure water : $CaCl_2(s)\rightarrow Ca^{2+}(aq)+2Cl^-(aq)$

As compound is dissociating into ions, the randomness increases and hence $\Delta S$ is positive.

3 0

3 years ago