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SSSSS [86.1K]
3 years ago
13

Evan was in his bedroom when he heard the sound of breaking glass. He went out to the kitchen to see a vase broken on the floor

and his dog walking away. Evan said "the dog broke the vase!” This statement is an
A. observation because he knows that his dog broke the vase.
B. observation because he heard the vase break before he came into the room.
C. inference because he formed a logical conclusion based on the evidence.
D. inference because he is blaming the dog without any proof.
Chemistry
2 answers:
emmainna [20.7K]3 years ago
7 0
The answer is d because he did not see the dog do it
Anna11 [10]3 years ago
3 0

Answer:D. inference because he is blaming the dog without any proof.

Explanation:

Observation can be define as a process of monitoring something by visual examination. Inference is a concluding content which is based on the observation and prior knowledge of the concept.

The given statement is the inference which is only based on the observation and there is no definite proof that the dog has actually broken the vase.

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The density of the hydrocarbon in part (a) is 2.0 g l-1 at 50°c and 0.948atm. (i) calculate the molar mass of the hydrocarbon. (
Vedmedyk [2.9K]

1. Answer;

=56 g/mol

Explanation and solution;

PV = nRT

nRT= mass/molar mass (RT)

molar mass = (mass/V ) × (RT/P)

                   = Density × (RT/P)

Molar mass = 2.0 g/L × (0.0821 × 323 K)/0.948 atm

Molar mass = 56 g/mol


2. Answer;

Molecular mass is C4H8

Explanation;

Empirical mass × n = molar mass

Empirical mass for CH2 = 14 g/mol

Therefore;

56 g/mol = 14 g/mol × n

   n = 4

The molecular formula= 4(CH2)

    = C4H8


7 0
3 years ago
What type of chemical process is used to create perfume?
morpeh [17]
It is esterification
8 0
3 years ago
Fe + O2 + H₂O- & Fe2O3 + H₂O. balance por el método de tanteo​
AveGali [126]

Answer:

Fe + O2 + H₂O___ Fe2O3 + H₂O.

6Fe+302+H2O______2fe 203+H2O

5 0
3 years ago
2. 27.8 mL of an unknown were added to a 50.0-mL flask that weighs 464.7 g. The total mass of the flask and the liquid is 552.4
agasfer [191]

Answer:

d=4.24x10^{-4}\frac{lb}{in^3}

Explanation:

Hello there!

In this case, according to the given information, it turns out firstly necessary for us to set the equation for the calculation of density and mass divided by volume:

d=\frac{m}{V}

Thus, we can find the mass of the unknown by subtracting the total mass of the liquid to the mass of the flask and the liquid:

m=552.4g-464.7g=87.7g

So that we are now able to calculate the density in g/mL first:

d=\frac{87.7g}{27.8mL}=3.15g/mL

Now, we proceed to the conversion to lb/in³ by using the following setup:

d=3.15\frac{g}{mL}*\frac{1lb}{453.6g}*\frac{1in^3}{16.3871mL}\\\\d=4.24x10^{-4}\frac{lb}{in^3}

Regards!

6 0
3 years ago
How much heat is lost when 0.440 mol of steam condenses at 100 °C?
dusya [7]

Answer:

17,890 J

Explanation:

The amount of heat released by a gaseous substance when it condenses is given by the formula

Q=n\lambda_v

where

n is the number of moles of the substance

\lambda_v is the latent heat of vaporization

The formula can be applied if the substance is at its vaporization temperature.

In this problem, we have:

n = 0.440 mol is the number of moles of steam

\lambda_v=40,660 J/mol is the latent heat of vaporization of water

And the steam is already at 100C, so we can apply the formula:

Q=(0.440)(40660)=17,890 J

8 0
3 years ago
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