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3 years ago

Plz help me with seven eight and nine

Chemistry

1 answer:

Nookie1986 [14]3 years ago

4 0

7 is atomic symbol 9 is atomic density 8 is the atomic number

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A student wants to investigate how the beaver is differnt from most other mammals in the wild

timofeeve [1]

Answer:

I believe the options are:

a. How many other mammals eat trees or other plants to survive?

b. How many other mammals live in an environment that includes water?

c. Do most other mammals have body structures adapted to the places where they live?

d. Do most other mammals change the environment to meet their survival needs?

Explanation:

Beavers, the largest rodents in North America, are classed as a keystone species i.e their presence affects other organisms as well as the abiotic factors in an ecosystem. Beavers enhance the habitat quality of a particular region and make it habitable for other organisms.

Beavers build dams that form wetlands that are home to majority of species in North America.
They filter water from silt and increase the quality of water.
They are "ecological indicators" i.e. they can help establish the health status of an ecosystem.

4 0

3 years ago

Calculate the de Broglie wavelength of a shotgun

snow_lady [41]

Answer : The de Broglie wavelength will be $3.68\times 10^{-33}m$

Solution :

The formula used for de Broglie wavelength is:

$\lambda=\frac{h}{mv}$ ..........(1)

where,

$\lambda$ = wavelength = ?

h = Planck's constant = $6.626\times 10^{-34}Js$

m = mass = 1.2 g = 0.0012 kg

Conversion used : 1 kg = 1000 g

v = velocity = 150 m/s

Now put all the given values in equation 1, we get:

$\lambda=\frac{6.626\times 10^{-34}Js}{(0.0012kg)\times (150m/s)}$

$\lambda=3.68\times 10^{-33}m$

Therefore, the de Broglie wavelength will be $3.68\times 10^{-33}m$

3 0

3 years ago

Which three phenomena occur during a double slit experiment and support the wave model of light?

Nat2105 [25]

Answer:

Option A, A-light bends around the edges of the slit.

6 0

3 years ago

How many moles of oxygen atom are there in 0.5 moles of Ca(ClO3) 2?

FinnZ [79.3K]

Answer:

Do a quick conversion: 1 moles Ca(ClO3)2 = 206.9804 gram using the molecular weight calculator and the molar mass of Ca(ClO3)2. ... How many moles Ca(ClO3 )2 in 1 grams? ... of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

Explanation:

(jayaanilanmol's answer)

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3 years ago

How does inertia affect a person who is not wearing a seatbelt during a collision?

olya-2409 [2.1K]

During a collision, the person would most likely experience the same conditions with or without a seatbelt.

5 0

3 years ago