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4 years ago

How is reactivity of elements related to valence electrons

1 answer:

3 0

The number of valence electrons determines reactivity.
For example, Noble Gases are not very reactive because they already have a full set of 8 valence electrons.
However, those with less electrons are more reactive because they don’t have a “full set” yet.
Also, keep in mind that as you move down a family the reactivity decreases.

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One way to improve food security is to avoid food spoilage. Identify the correct ways that Devon reduced food spoilage in the pa

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The correct answer would be "He brought one serving to his neighbor's house, and stored the other two servings in the refrigerator. Devon ate one more serving or spaghetti the following day."

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4 years ago

Read 2 more answers

Joey works at the airport repairing airplane engines, where the decibel level can reach over 100 dB. Wearing protective earwear,

Temka [501]

C.100. the ear plugs block out the sound

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3 years ago

Read 2 more answers

Can someone answer these?

natita [175]

Short Answer

3: C

4: D

Problem Three

Remark

Somewhere we ought to be told that this is the Doppler Effect. I have never done a problem using this formula, so I think I'm doing it correctly, but no guarantees. My guess is that the frequency increases as it comes towards you and decreases as it moves away from you. I think that is correct.

Formula

Givens

f' = observed frequency
f = actual frequency
v = velocity of sound or light waves.
vo = velocity of observer (in both cases 0)
vs = velocity of source.

f' = (v + vo) * f / (v - vs)

Solution

v = 3*10^8 m/s
f' = 1.1 f
f = f
vo = 0 We are standing still while all this is going on.
vs = ???

f'/f = 1.1

1.1 = (3*10^8 + 0 ) / (3*10^8 - vs)

3.3*10^8 - 1.1*vs = 3*10^8

3.3*10^8 - 3*10^8= 1.1 vs

0.3 * 10^8 = 1.1 vs

2.73 * 10^7 = vs

The closest answer is 3.00 * 10^7 which is C

Problem Four

Here what is happening is that you are looking for the frequency resulting from a wave moving towards you at 1/2 the speed of sound. You are not moving.

Givens

v = v
vs = 1/2 v
f ' = ?
f = 1000 hz
vo =0

f' = v/(v - 1/2v) * 1000

f' = v/ (1/2 v) * 1000

f' = 2 * 1000

f' = 2000 which is D

4 0

4 years ago

Dimensional formula of frequency with explation

____ [38]

Frequency:

Frequency is defined as number of events occurring per second.

Mathematically written as

$f=\frac{no. of events}{time}$

The dimensions $f$ are

$[f]=\frac{1}{[T]}$

$[T]=[S]$

so,

$[f]=[S^{-1}]$

5 0

3 years ago

Drag racing cars are very elongated with the front wheels placed very far away from the rear wheels. This placement helps keep t

anygoal [31]

Answer:

Explanation:

Now for this kind of phenomena in which drag cars are very elongated with front wheels placed far away from the rear wheels resulting in keeping the car front end from nosing upward,this is due to the reason because it helps in shifting the center of mass towards the front.

Hence when the car accelerates

torque due to gravity = torque due to air friction

8 0

3 years ago