Magnesium and nitrogen react to form magnesium nitrate. Which of the following expressions represents this chemical reaction?

Characteristic do many protists share with bacteria and archaea?

tatiyna

Archaea and bacteria are tiny, single-cell organisms which cannot be seen by the naked human eye. They are microbes and both prokaryotes. This means that they do not have a nucleus and lack membrane-bound organelles.
Protists on the other hand are small eukaryotes. They can be unicellular or multicellular, but most of them are unicellular which is characteristic they share with the bacteria and archaea.
- They transcribe sections of their DNA code into RNA, then translate this RNA into protein using complex structures called ribosomes.
- Have cell membranes made of chemicals called phospholipids.
- Have similar biochemical processes, for example the process glycolysis (the process used to break down glucose).

8 0

3 years ago

Read 2 more answers

Molarity and Dilution

Aleonysh [2.5K]

Answer: The moles needed are 0.01.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

where,

n = moles of solute $(CuSO_4.5H_2O)$ = ?

$V_s$ = volume of solution in ml

Now put all the given values in the formula of molarity, we get

$0.10=\frac{n\times 1000}{100}$

$n=\frac{0.10\times 100}{1000}=0.01$

Therefore, the moles needed are 0.01.

6 0

3 years ago

List and describe the two major types of plastics.

stiv31 [10]

Answer:

Thermoplastics and thermosets

Explanation:

The two key categories of plastic are thermoplastics and thermosetting plastics (thermosets). Thermoplastic products have the ability to be continually softened, melted and reshaped/recycled, for instance in injection molding or extrusion resins. However, thermoset products do not have this property.

7 0

3 years ago

How many molecules of Helium are in 1.0 mole?

FinnZ [79.3K]

Answer: 6158.46

Explanation:

1 mole of helium gas contains 6.02 x1023 helium atoms. 1 mole of water contains 6.02 x1023 water molecules.

7 0

3 years ago

A mineral sample is obtained from a region of the country that has high arsenic contamination. An elemental analysis yields the

Gnesinka [82]

Answer:

CaAsHO₄

Explanation:

The data has a mistake in one of the values there. I believe the mistake is on the hydrogen. So, I'm going to assume the value of Hydrogen is 0.6%, so the total percent composition would be 100.1% (Something better). All you have to do is replace the correct value of H (or the value with the mistaken option) and do the same procedure.

Now, to calculate the empirical formula, we can do this in three steps.

Step 1. Calculate the amount in moles of each element.

In these case, we just divide the percent composition with the molar mass of each one of them:

Ca: 22.3 / 40.078 = 0.5564

As: 41.6 / 74.9216 = 0.5552

O: 35.6 / 15.9994 = 2.2251

H: 0.6 / 1.00794 = 0.5953

Now that we have done this, let's calculate the ratio of mole of each of them. This is doing dividing the smallest number of mole between each of the moles there. In this case, the moles of As are the smallest so:

Ca: 0.5564/0.5552 = 1.0022

As: 0.5552/0.5552 = 1

O: 2.2251/0.5552 = 4.0077

H: 0.5953/0.5552 = 1.0722

Now, we round those numbers, and that will give us the number of atoms of each element in the empirical formula

Step 3. Write the empirical formula with the rounded numbers obtained

In this case we will have:

Ca: 1

As: 1

O: 4

H: 1

The empirical formula would have to be:

CaAsHO₄

3 0

3 years ago