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3 years ago

What is the difference between a theory and an observation

Chemistry

1 answer:

UNO [17]3 years ago

4 0

A theory is like a hypothesis like an idea. Observation is to gain information like taking notes about what you see.

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Does the mass of a ball affect how far it rolls

dybincka [34]

Yes, it depends on the size of the ball and the weight. If it's heavy and big then it'll affect how far it rolls, if it's small and has no weight then it won't really move as much

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3 years ago

Read 2 more answers

Atomic number of a member of halogens

ELEN [110]

Bromine 35

Chlorine 17

Flourine 9

Iodine 53

Astatine 85

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3 years ago

At Appliance City you sold a refrigerator to a customer for $369.00. Appliance City advertises that if a customer finds the same

Alik [6]

Answer:

$318

Explanation:

I hope this helps!

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3 years ago

Rank the following solutions from lowest to highest vapor pressure.

Fantom [35]

Solution :

When non volatile solute is added to solvent, vapor pressure gets lowered.

Relative lowering in vapor pressure is given :

$\frac{P^0-P}{P^0}$ = $\text{mole fraction}$ of solute

$\frac{P^0-P}{P^0}=x_B$

$P^0$ = vapor pressure of pure solvent

P = vapor pressure of solution

$x_B$ = mole fraction of solute

$x_B=\frac{n_B}{n_A+n_B}$

$n_B$ = $\text{number of moles of solute}$

$n_A$ = $\text{number of moles of solvent}$

Number of moles $=\frac{\text{weight}}{\text{molecular weight}}$

$\frac{P^0-P}{P^0}=\frac{w_B/M_B}{w_A/M_A+w_B/M_B}$

$\approx \frac{w_B/M_B}{w_A/M_A}$

1. For 10 g of $CH_3COOK$

$CH_3COOK \rightarrow CH_3COO^- + K^+$

Ions = 2

It will affect colligative property.

$\frac{P^0-P}{P^0} = \frac{i \times 10/98}{w_A/M_A}$

Relative lowering in vapor pressure will be :

$=\frac{2 \times 10/98}{w_A/M_A}$

$=\frac{0.20}{w_A/M_A}$

2. For 20 g sucrose

Sucrose is non electrolyte, i = 1

$\frac{P^0-P}{P^0} = \frac{ 20/342}{w_A/M_A}$

$=\frac{0.050}{w_A/M_A}$

3. For 20 g of glucose.

Glucose is a non electrolyte, i = 1

$\frac{P^0-P}{P^0} = \frac{20/180}{w_A/M_A}$

$=\frac{0.11}{w_A/M_A}$

$w_A/M_A$ is same in all three solutions.

Hence, lowering in vapor pressure is maximum in $CH_3COOK$ and minimum is Sucrose.

Vapor pressure from lowest to highest.

10 g of $CH_3COOK$ < 20 g of glucose < 20 g of sucrose

6 0

3 years ago

If a sample of DNA contained 20% cytosine, what percentage of guaninewould be in this sample and what percentage of adenine woul

timofeeve [1]

Guanine and Cytosine are complementary pairs in the DNA molecule (which means that Cytosine is bonded via hydrogen bonds to Guanine). This is the same for Adenine and Thymine. As such if a sample of DNA contains 20% Cytosine then it also contains approximately 20% Guanine.

The percentage of Thymine + Adenine would be 100% - 40% = 60%... Since this 60% should be equally shared between Thymine and Adenine then it implies that the percentage Adenine would be approximately 30%.

7 0

3 years ago