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3 years ago

14

Mountains and valleys are some of the features found in the layer of rock at Earth's surface called the

1 answer:

loris [4]3 years ago

5 0

Answer:

Narrow

Explanation:

Narrow

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Will iron fillings and lead oxide powder react

Andru [333]

Answer:

Yes they woll react.

Explanation:

Ferous oxide and zinc will be product.

8 0

3 years ago

Porque as vezes nos da borboletas no estomago?

nexus9112 [7]

Answer:

No haces literalmente, pero metepóricamente, su forma de hablar, lo que significa que tienes un sentimiento no argumental hacia algunos. La resonancia detrás de esto es que algunas personas pueden encontrar atractiva a una persona concreta o tener una buena personalidad, así que comienzas a asimilar esos sentimientos.

Explanation:

8 0

2 years ago

From a 2.875 g sample containing only iron, sand, and salt, 0.660 g of iron and 1.161 g of sand were separated and recovered. Wh

Serjik [45]

Answer:

36.66%

Explanation:

Step 1: Given data

Mass of iron: 0.660 g

Mass of sand: 1.161 g

Mass of the sample: 2.875 g

Mass of salt: ?

Step 2: Calculate the mass of salt

The mass of the sample is equal to the sum of the masses of the components.

m(sample) = m(iron) + m(sand) + m(salt)

m(salt) = m(sample) - m(iron) - m(sand)

m(salt) = 2.875 g - 0.660 g - 1.161 g

m(salt) = 1.054 g

Step 3: Calculate the percent of salt in the sample

We will use the following expression.

%(salt) = m(salt) / m(sample) × 100%

%(salt) = 1.054 g / 2.875 g × 100% = 36.66%

7 0

3 years ago

which of the following substances diffuses faster in a beaker filled with water a drop of honey or drop of red ink

nekit [7.7K]

Red ink since the substance is has a lower viscosity

4 0

3 years ago

Read 2 more answers

At 25°C and constant pressure, carbon monoxide gas combines with oxygen gas to give carbon dioxide gas with the evolution of 10.

stealth61 [152]

Answer : The value of $\Delta H$ for the reaction is, -565.6 kJ

Explanation :

First we have to calculate the molar mass of CO.

Molar mass CO = Atomic mass of C + Atomic mass of O = 12 + 16 = 28 g/mole

Now we have to calculate the moles of CO.

$\text{Moles of }CO=\frac{\text{Mass of }CO}{\text{Molar mass of }CO}=\frac{1g}{28g/mole}=\frac{1}{28}mole$

Now we have to calculate the value of $\Delta H$ for the reaction.

The balanced equation will be,

$2CO(g)+O_2(g)\rightarrow 2CO_2(g)$

From the balanced chemical reaction we conclude that,

As, $\frac{1}{28}mole$ of CO release heat = 10.1 kJ

So, 2 mole of CO release heat = $2\times 28\times 10.1=565.6kJ$

Therefore, the value of $\Delta H$ for the reaction is, -565.6 kJ (The negative sign indicates the amount of energy is released)

4 0

3 years ago