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Sergeeva-Olga [200]
2 years ago
6

Which element is most plentiful in Earth's crust?

Chemistry
1 answer:
dem82 [27]2 years ago
5 0

Answer:

Oxygen is the most contain in earth but you asked in a,b,c and d. So I'll choice A. aluminium.

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How can the rate of a reaction be decreased?
Agata [3.3K]
Reducing surface area
3 0
3 years ago
Read 2 more answers
¿Qué volumen ocuparán 12 g de hierro?
sasho [114]

Answer:

        \large\boxed{\large\boxed{volume=1.5cm^3}}

Explanation:

Translation:

  • <em>What volume will 12g of iron occupy?</em>

<em></em>

<h2>Solution</h2>

<em />

<em>Iron</em> is a solid substance at room temperature. You can find the <em>volume</em> of solids (and of not solids) using the density.

      Density=\dfrac{mass}{volume}

You can obtaindthe density of most pure substances in the internet. The density of<em> iron</em> at room temperature is 7.874 g/cm³.

Thus, substituting in the formula, you get:

      7.874g/cm^3=\dfrac{12g}{volume}\\ \\ \\ volume=\dfrac{12g}{7.874g/cm^3}\\ \\ \\ volume=1.5cm^3

The answer is rounded to two significant figures because the input, 12g, has two significant figures.

8 0
3 years ago
Hydrogen gas, iodine vapor, hydrogen iodine are mixed in a flask and heated to 696°C. H2(g) + I2(g) ⇋ 2 HI(g) Kc = 52 at 696°C I
Anettt [7]

Answer: The equilibrium concentration of hydrogen gas is 0.0269 M

Explanation:

The chemical reaction follows the equation:

                  H_2(g)+I_2(g)\rightleftharpoons 2HI(g)

At t = 0          0.044M     0.044M              0.177M  

At t=t_{eq}    (0.044-x)M    (0.044-x)M      (0.177+x)M

The expression for K_c for the given reaction follows:

K_c=\frac{[HI]^2}{[H_2]\times [I_2]}

We are given:

K_c=52

Putting values in above equation, we get:

52=\frac{(0.177+x)^2}{(0.044-x)^2}

x=0.0171M

Hence, the equilibrium concentration of hydrogen gas is (0.044-x) M =(0.044-0.0171) M= 0.0269 M

7 0
2 years ago
N2H4+H2O2 ——&gt; N2+H2O coefficient
const2013 [10]

Answer:

N2H4 + 2H2O2 ---->N2 + 4H2O

Explanation:

N=2            N=2

H=6 ->8      H=2 ->8

O=2 -> 4     O=1 -> 4

Add coefficients to hydrogen peroxide on the left and water on the right, so that there is an equal number of hydrogens and oxygens.

3 0
3 years ago
A general change, such as increasing or decreasing numbers
Blababa [14]

c)pattern

Explanation:

A general change such as increasing or decreasing numbers is called a pattern. A pattern shows a structured way of implementing a change.

  • Patterns can be a form of increment in values by adding a particular number at intervals.
  • It can be a division, multiplication or subtraction of a consistent number.
  • Patterns can provide insight into understanding a number system or a group of numbers.  
  • Sequences are usually derived from patterns.

Learn more:

Patterns brainly.com/question/4694425

#learnwithBrainly

7 0
2 years ago
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