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slava [35]
3 years ago
6

Does this model represent a compound? Explain your answer

Mathematics
2 answers:
Svetlanka [38]3 years ago
7 0

Answer:

The model does not represent a compound because it shows two atoms of the same element combined.

Compounds are made of two or more atoms of different elements.

In a ball-and-stick model of a compound, there should be balls of different colors

zvonat [6]3 years ago
3 0

Answer:

No

Step-by-step explanation:

The model shows two similar elements.

Although we do not know what the element is, we can conclude that the model is not a compound.

This is because the definition of  a compound is when two different elements join.

However, the model has two similar elements, which forms a molecule, not a compound.

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Answer:

(a) The probability that both Dave and Mike will show up is 0.25.

(b) The probability that at least one of them will show up is 0.75.

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Step-by-step explanation:

Denote the events as follows:

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(a)

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P(D\cap M)=P(D)\times P (M)\\=[1-P(D^{c})]\times [1-P(M^{c})]\\=[1-0.55]\times[1-0.45]\\=0.2475\\\approx0.25

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(b)

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P (At least one of them will show up) = 1 - P (Neither will show up)

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(c)

Compute the probability that neither Dave nor Mike will show up as follows:

P(D^{c}\cup M^{c})=1-P(D\cup M)\\=1-P(D)-P(M)+P(D\cap M)\\=1-[1-P(D^{c})]-[1-P(M^{c})]+P(D\cap M)\\=1-[1-0.55]-[1-0.45]+0.25\\=0.25

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