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2 years ago

Trey was asked to build a working model of a landform for a science project. He chose to build a model of a volcano.

Chemistry

2 answers:

Colt1911 [192]2 years ago

8 0

Answer:

The answer is "how closely the model's behavior matches the real world "

Explanation:

Your options were glitched out, so it only showed A and C, and B and D were blank so lol

maksim [4K]2 years ago

3 0

Can you please give me more details so I can help you

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Which solution of NaI would be most dissociated? 0.1 M 0.8 M 0.3 M 0.6 M

My name is Ann [436]

Answer: The NaI will be most dissociated in 0.1M

Explanation:

NaI is an ionic compound having $Na^+$ and $I^-$ ions. It is also a strong electrolyte as it completely gets dissociated into its respective ions.

This behaves as a strong electrolyte when it is very dilute because when the solution is concentrated, the positive and negative charges will form ion pairs.

Hence, NaI will be most dissociated in the solution having 0.1M

5 0

2 years ago

Define basal metabolic rate

lubasha [3.4K]

Basal Metabolic Rate is the number of calories required to keep your body functioning at rest. BMR is also known as your body's metabolism; therefore, any increase to your metabolic weight, such as exercise, will increase your BMR.

6 0

2 years ago

Read 2 more answers

It takes 258 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be us

Sergeeva-Olga [200]

Answer: The wavelength of light that can be used is 464 nm

Explanation:

We are given:

Energy of the electrons = 258 kJ/mol

This is the energy of the 1 mole of electrons

To calculate the energy of 1 electron, we divide the energy by Avogadro's number:

$\text{Energy of 1 electron}=\frac{E}{N_A}$

$N_A=6.022\times 10^{23}$

$E=258kJ/mol=2.58\times 10^5J/mol$ (Conversion factor: 1 kJ = 1000 J)

Putting values in above equation, we get:

$\text{Energy of 1 electron}=\frac{2.58\times 10^5}{6.022\times 10^{23}}=4.28\times 10^{-19}J$

To calculate the energy of one photon, we use Planck's equation, which is:

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

where,

h = Planck's constant = $6.625\times 10^{-34}J.s$

c = speed of light = $3\times 10^8m/s$

Energy of 1 electron = $4.28\times 10^{-19}J$

Putting values in above equation, we get:

$4.28\times 10^{-19}J=\frac{6.625\times 10^{-34}J.s\times 3\times 10^8m/s}{\lambda}\\\\\lambda=\frac{6.625\times 10^{-34}\times 3\times 10^8m/s}{4.28\times 10^{-19}}=4.64\times 10^{-7}m$

Converting this to nano meters, we use the conversion factor:

$1m=10^9nm$

So, $4.64\times 10^{-7}m\times \frac{10^9nm}{1m}=464nm$

Hence, the wavelength of light that can be used is 464 nm

3 0

3 years ago

Can you tell me name of chemicals in sea Please?

shutvik [7]

Explanation:

chloride

sodium

magnesium

sulfate

3 0

2 years ago

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Write the rate of reaction in terms of the rate of disappearance of reactant and the rate of formation of the product NO(g) +O3

STALIN [3.7K]

Answer:

See Explanation

Explanation:

The rate of reaction means the same thing as the speed of a reaction. It refers to how quickly or slowly the reactants disappear or how quickly or slowly the products appear per unit time.

The equation of the reaction is; NO(g) + O3(g)→ NO2(g) + O2(g)

We can write differential equations to show the rate of disappearance of reactants or rate of appearance of products as shown below where the rate of reaction has been denoted as r;

r = -d[NO(g)]/dt = -d[O3(g)]/dt

r = d[NO2(g)]/dt = d[O2(g)]

The negative signs shows that the concentration of reactants decreases with time while the positive sign shows that the concentration of products increases with time.

6 0

2 years ago