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3 years ago

State 2 ways in which adaptation help animals?

1 answer:

6 0

Camouflage, mimicry, and animals' body parts and coverings are physical adaptations. The way in which an animal behaves is an adaptation, too—a behavioral adaptation . Behaviors that animals are born knowing how to do are instincts . A lion preying upon a zebra and a bird building a nest are examples of instincts.

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When an ionic compound such as sodium chloride (NaCl) is placed in water, the component atoms of the NaCl crystal dissociate int

sesenic [268]

Answer:

The solution expected to contain the greatest number of solute particles is: A) 1 L of 1.0 M NaCl

Explanation:

The number of particles is calculated as:

a) For Ionic compounds:

molarity × volume in liters × number of ions per unit formula.

b) For covalent compounds:

molarity × volume in liters

The difference is a factor which is the number of particles resulting from the dissociation or ionization of one mole of the ionic compound.

So, calling M the molarity, you can write:

# of particles = M × liters × factor

This table show the calculations for the four solutions from the list of choices:

Compound kind Particles in solution Molarity # of particles

(dissociation) (M) in 1 liter

A) NaCl ionic ions Na⁺ and Cl⁻ 1.0 1.0 × 1 × 2 = 2

B) NaCl ionic ions Na⁺ anc Cl⁻ 0.5 0.5 × 1 × 2 = 1

C) Glucose covalent molecules 0.5 0.5 × 1 × 1 = 0.5

D) Glucose covalent molecules 1.0 1.0 × 1 × 1 = 1

Therefore, the rank in increasing number of particles is for the list of solutions given is: C < B = D < A, which means that the solution expected to contain the greatest number of solute particles is the solution A) 1 L of 1.0 M NaCl.

8 0

3 years ago

What is one way to make a positive impact on air quality to reduce air pollution

geniusboy [140]

Answer:

using public transportation

Explanation:

With the use of public transport, there will be a reduction in the number of cars on the streets, this reduction will cause a reduction in the gases released by cars into the atmosphere, which will result in a reduction in air pollution.

5 0

3 years ago

Calculate the frequency of the light emitted by ahydrogen atom

lesya [120]

Answer: $0.31\times 10^{16}Hz$ .

Explanation:

$E=\frac{hc}{\lambda}$

$\lambda$ = Wavelength of radiation

E= energy

Using Rydberg's Equation:

$\frac{1}{\lambda}=R_H\left(\frac{1}{n_i^2}-\frac{1}{n_f^2} \right )\times Z^2$

Where,

$\lambda$ = Wavelength of radiation = ?

$R_H$ = Rydberg's Constant

$n_f$ = Higher energy level = 4

$n_i$ = Lower energy level = 1

Z= atomic number = 1 (for hydrogen)

Putting the values, in above equation, we get

$\frac{1}{\lambda}=10973731.6m^{-1}\left(\frac{1}{1^2}-\frac{1}{4^2} \right )\times 1$

$\lambda=9.7\times 10^{-8}m$

The relationship between wavelength and frequency of the wave follows the equation:

$\nu=\frac{c}{\lambda}$

where,

$\nu$ = frequency of the wave = ?

c = speed of light = $3\times 10^8ms^{-1}$

$\lambda$ = wavelength of the wave = $9.7\times 10^{-8}m$

$\nu=\frac{3\times 10^8ms^{-1}}{9.7\times 10^{-8}m}$

$\nu=0.31\times 10^{16}s^{-1}=0.31\times 10^{16}Hz$

The frequency of the light emitted by a hydrogen atom during a transition of its electron from the n = 4 to the n = 1 principal energy level is $0.31\times 10^{16}Hz$ .

5 0

3 years ago

How can I write mass as a sentence

Stells [14]

The mass of a textbook was really heavy.
Hope I helped

3 0

3 years ago

Read 2 more answers

This turbine was mostly installed because wind power ?.......

Montano1993 [528]

Answer:

Wind turns the propeller-like blades of a turbine around a rotor, which spins a generator, which creates electricity.