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3 years ago

The density of gold is 19.3 g/cm3, and the density of iron pyrite is 5.02 g/cm3. What substance do you think you found?

Chemistry

1 answer:

Harrizon [31]3 years ago

4 0

Answer:

Step 1

1 of 2

V = m / D; V (nugget of gold) = 50 g / 5.0 g / cm 3 = 10 cm3; V (nugget of iron pyrite) = 50 g / 19 g / cm3 = 2.63 cm 3

Result

2 of 2

Due to these results you can conclude that nugget of gold which volume is 10 cm3 is bigger than volume of nugget of iron pyrite which is 2.63 cm3.

Explanation:

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Geotropism explains which of the following phenomena?

Sladkaya [172]

The correct answer of the given question above would be option B. Geotropism or also known as Gravitopism explains this phenomena which is a seed is planted upside-down, but the roots still grow in the direction of gravity. Geotropism is <span>the growth of the parts of plants with respect to the force of gravity. Hope this answer helps.</span>

6 0

3 years ago

Sodium metal and water react to form hydrogen and sodium hydroxide. If 11.96 g of sodium react with water to form 0.52 g of hydr

Anastasy [175]

Answer:

9.36g of H2O.

Explanation:

We'll begin by writing the balanced equation for the reaction.

2Na + 2H2O —> 2NaOH + H2

Next, we shall determine the mass of Na and H2O that reacted from the balanced equation.

This is illustrated below:

Molar mass of Na = 23g/mol

Mass of Na from the balanced equation = 2 x 23 = 46g

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

From the balanced equation above,

46g of Na reacted with 36g of H2O.

Now, we can determine the mass of H2O involved in reaction as follow:

From the balanced equation above,

46g of Na reacted with 36g of H2O.

Therefore, 11.96g of Na will react with = (11.96 x 36)/46 = 9.36g of H2O.

Therefore, 9.36g of H2O were used for the reaction.

4 0

3 years ago

Which phenomena support only the wave theory of light?

Salsk061 [2.6K]

Phenomena that supports the only wave theory of light is replfectuon

8 0

3 years ago

Read 2 more answers

Look at the potential energy diagram for a chemical reaction.

vladimir1956 [14]

Answer: The activation energy is 10 kJ and the reaction is exothermic.

Explanation: Exothermic reactions are those in which heat is released and thus the energy of products is less than the energy of reactants.

Endothermic reactions are those in which heat is absorbed and thus the energy of products is more than the energy of reactants.

Activation energy is the extra amount of energy required by the reactants to cross the energy barrier to convert to products.

Given : Energy of reactants = 40kJ

Energy of activation: (50-40)=10 kJ

Energy of products = 50 kJ

Energy of products = 15 kJ

Thus Energy of products (15kJ) < Energy of reactants(40kJ), the reaction is exothermic as energy has been lost to surroundings in the form of heat.

8 0

3 years ago

How many moles of h2o are equivalent to 97.3 grams of h20

g100num [7]

Answer : 5.405 moles of $H_2O$ are equivalent to 97.3 grams of $H_2O$

Solution : Given,

Mass of $H_2O$ = 97.3 g

Molar mass of $H_2O$ = 18 g/mole

Formula used :

$\text{ Number of moles}=\frac{\text{ Given mass}}{\text{ Molar mass}}$

or,

$\text{ Number of moles of }H_2O=\frac{\text{ Given mass of }H_2O}{\text{ Molar mass of }H_2O}$

Now put all the given values in this formula, we get the moles of $H_2O$

$\text{ Number of moles of }H_2O=\frac{97.3g}{18g/mole}=5.405moles$

Therefore, 5.405 moles of $H_2O$ are equivalent to 97.3 grams of $H_2O$

6 0

3 years ago