All categories

3 years ago

PLEASE HELP!!

Chemistry

1 answer:

Montano1993 [528]3 years ago

7 0

Answer:

B: Parent rock breaks into smaller pieces.

Explanation:

Weathering the first step in the process of soil formation. The process of breaking up off the parent rocks into simple forms, is termed as weathering. The formation of soil is a very gradual and slow process. It takes millions of years for the rocks to become soil. The dead and decaying matter of plants and animals are also included in the rocks. Water, sun, climatic conditions and rain are some of the factors that effect weathering.

You might be interested in

What reagent is <br>used to test for starch<br>

Elodia [21]

Answer:

iodine

Explanation:

In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test. For example, if iodine is added to a peeled potato then it will turn black. Benedict's reagent can be used to test for glucose.

8 0

4 years ago

Xác định nội năng chuẩn ΔU của phản ứng tổng hợp amoniac

Step2247 [10]

Explanation:

xác định nội năng chuẩn ΔU của phản ứng tổng hợp amoniac

ở 400 0 C, biết :

N 2(k) + 3H 2(k) = 2NH 3(k) ΔH 0 T = - 109,0 kJ

7 0

2 years ago

A. Calculate the empirical formula of a molecule with percent compositions: 55.3% potassium (K), 14.6% phosphorus (P), and 30.1%

Otrada [13]

The way you calculate the empirical formula is to firstly assume 100g. To find each elements moles you take each elements percentage listed, times it by one mole and divide it by its atomic mass. (ex: moles of K =55.3g x 1 mole/39.1g, therefore there is 1.41432225 moles of Potassium) Once you’ve completed this for every element you list each elements symbol beside it’s number of moles and divide by the smallest number because it can only go into its self once. After you’ve done this, you’ve found your empirical formula, which is the simplest whole number ratio of atoms in a compound. I’ve added an example of a empirical question I completed last semester :)

6 0

3 years ago

Read 2 more answers

5. 16.3 g of NaCl is dissolved in water to make 1.75 L of solution. What is the molarity of this solution? A 0.159 M B 0.278 M C

ira [324]

Answer: The molarity of this solution is 0.159 M.

Explanation:

Given: Mass of solute = 16.3 g

Volume = 1.75 L

Number of moles is defined as the mass of substance divided by its molar mass.

Hence, moles of NaCl (molar mass = 58.44 g/mol) ar calculated as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{16.3 g}{58.44 g/mol}\\= 0.278 mol$

Molarity is the number of moles of a substance present in a liter of solution.

So, molarity of the given solution is calculated as follows.

$Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.278 mol}{1.75}\\= 0.159 M$

Thus, we can conclude that the molarity of this solution is 0.159 M.

5 0

3 years ago

Describe the particle that is emitted during alpha decay. How do you think an atom changes when it undergoes alpha decay?

weqwewe [10]

Answer:

Helium nuclei is emitted during alpha decay.

Explanation:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number 4 less than and atomic number 2 less than the starting atom.

Properties of alpha radiation:

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

Example:

₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy

8 0

3 years ago