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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 half life for the decay of carbon- is years. Suppose the activity due to the radioactive decay of the carbon- in a tiny samp
EleoNora [17]

The question is incomplete. The complete question is:

The half-life for the decay of carbon-14 is 5.73x10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of woodfrom an archeological dig is measured to be 2.8x10^3 Bq. The activity in a similiar-sized sample of fresh wood is measured to be 3.0x10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.

Answer:

570 years

Explanation:

The activity of the fresh sample is taken as the initial activity of the wood sample while the activity measured at a time t is the present activity of the wood artifact. The time taken for the wood to attain its current activity can be calculated from the formula shown in the image attached. The activity at a time t must always be less than the activity of a fresh wood sample. Detailed solution is found in the image attached.

6 0
3 years ago
Mr. Smith wanted to see if the color of light shined on a plant had an effect on the number of leaves it had. He gathered a 2
iragen [17]
Higgffggvtgrjtbrb verve even
3 0
2 years ago
A 4.24 kg marble slab has the volume of 1564 cm3 What is the density in g/cm3
miskamm [114]

Answer:

The answer is

<h2>2.71 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question

volume of marble = 1564 cm³

1 kg = 1000 g

4.24 kg = 4240 g

mass = 4240 g

The density is

density =  \frac{4240}{1564}   \\  = 2.710997442...

We have the final answer as

<h3>2.71 g/cm³</h3>

Hope this helps you

7 0
2 years ago
An example of a solid solution is copper true or false
garik1379 [7]
This is false, because copper is an element.
To be solution, it has to have at least 2 different substances. Solid solution of metals is often called alloy. 
4 0
3 years ago
3.
Vsevolod [243]

Answer:

2 half-lives=0.8

6 half-lives= 0.05

Explanation

Half-lives are constant and always decrease by half, implying that the concentration decreases by half at a consistent rate.

3.2/2= 1.6/2= 0.8 is two half-lives

3.2/2= 1.6/2= 0.8/2= 0.4/2= 0.2/2= 0.1/2=0.05 is six half-lives

3 0
2 years ago
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