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3 years ago

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Given example of the model used in science that is larger than the real object and an example of a model that is smaller than th

e real object

1 answer:

e-lub [12.9K]3 years ago

7 0

The model of the solar system is way smaller than the real object. The model of sub-atomic particles in a atom is way larger than the real object.

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Elaborate on the role of activation energy in chemical reactions. A) Decreasing the activation energy leads to higher randomness

Zina [86]

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3 years ago

Read 2 more answers

a student adds 3.5 moles of solute to enough water to make a 1500mL solution. what is the concentration?

aksik [14]

<h2>Hello!</h2>

The answer is:

$MolarConcentration=\frac{3.5moles}{volume(1.5L)}=2.33molar$

<h2>Why?</h2>

Since there is not information about the solute but only its mass, we need to assume that we are calculating the molar concentration of a solution or molarity. So, need to use the following formula:

$MolarConcentration=\frac{mass(solute)}{volume(solution)}$

Now, we know that the mass of the solute is equal 3.5 moles and the volume is equal to 1500 mL or 1.5L

Then, substituting into the equation, we have:

$MolarConcentration=\frac{3.5moles}{1.5L}=2.33molar$

Have a nice day!

7 0

3 years ago

Read 2 more answers

The source of bitterness in dark chocolate is the compound theobromine, an alkaloid present in cocoa beans. In a sample of dark

spin [16.1K]

Answer: 193 mg of theobromine are present in the sample.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadros number}}=\frac{6.45\times 10^{20}}{6.023\times 10^{23}}=1.07\times 10^{-3}moles$

1 mole of theobromine $(C_7H_8N_4O_2)$ weigh = 180 g

$1.07\times 10^{-3}moles$ of theobromine $(C_7H_8N_4O_2)$ weigh = $\frac{180}{1}\times 1.07\times 10^{-3}=0.193g=193mg$ (1g=1000mg)

193 mg of theobromine are present in the sample.

5 0

3 years ago

What is a common property of metals?

Y_Kistochka [10]

Answer:

B) conducts electricity

Explanation:

Metals are conductors, literally meaning they conduct electricity.

One metal is liquid at room temp (there might be one more but I only know of mercury).

The reactivity depends on the placement in the periodic table.

If it conducts electricity, it can't be an insulator.

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3 years ago

Wich describes an object in projectile motion?

statuscvo [17]

Answer:

Hey, I'll help but I don't know what your options are.

Explanation:

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3 years ago