All categories

3 years ago

Please help me out with this

Chemistry

1 answer:

Nataly_w [17]3 years ago

7 0

Answer:

number 3 i think

Explanation: im sorry if im wrong

You might be interested in

The elements listed in the periodic table account

ddd [48]

Answer:

Only 4 %

Explanation:

Just about 4 percent of the known universe overall mass consists of atomic nuclei and is therefore described by chemical components. This proportion is around 15 percent of the total mass, with dark energy becoming the majority of the material .

3 0

3 years ago

Classify which compounds will dissolve in water and which ones will not dissolve in water.

vredina [299]

Answer:

Dissolves in water: Acetone, 1-propanol, Methanol

Do not dissolve in water: Hexane, Decane

Explanation:

From the principle that like dissolves like,polar substances will dissolve in polar solutions, while non-polar substances will dissolve in non-polar substances.

Water is a polar solution, therefore, polar substances will dissolve in it.From the given options:

Acetone is a polar molecule, therefore, it will dissolve in water.

1-propanol is a polar molecule, therefore, it will dissolve in water.

Hexane is a non-polar molecule, therefore, it will not dissolve in water.

Methanol is a polar molecule, therefore, it will dissolve in water.

Decane is a non-polar molecule, therefore, it will not dissolve in water

6 0

3 years ago

The depictions of ionic compounds do not show distinct compound units but rather a collection of ions in the ratio given by the

Sedaia [141]

Answer:

The ionic compound NaCl has a Face Centered Cubic unit cell

The site for atoms are Face, center and Edges corner.

Effective number of atoms

Na+

1centers + 12edges x $\frac{1}{4}$ = 4 Na+

Cl-

6face x $\frac{1}{2}$ + $\frac{1}{8}$ x8 corners = 4Cl-

This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.

4 0

3 years ago

2 NaOH (s) + CO2(g) → Na2CO3 (s) + H20 (I) How many grams of water can be produced with 1.85 moles of NaOH

Romashka [77]

Explanation:

Mole ratio of NaOH to H2O = 2 : 1

Moles of H2O = 1.85mol * (1/2) = 0.925mol.

Mass of H2O = 0.925mol * (18g/mol) = 16.65g.

4 0

3 years ago

Read 2 more answers

Which of the following elemental sequence represents an increase in atomic size?

xz_007 [3.2K]

Answer:

A) B, C, Na, AI, K

Explanation:

This is because from the periodic table, the atomic size of each element increases as we go along the periodic table.

The atomic numbers of the elements are B = 5, C = 6 , Na = 11, Al = 13 and K = 19.

The electronic configuration of each element is given as follows

B = 2, 3; C = 2, 4; Na = 2, 8, 1; Al = 2, 8, 3 and K = 2, 8, 8, 1

Since the atomic numbers increase from left to right as we go along the periodic table, their atomic sizes also increase.

Also, from their electronic configurations, Boron (B)and Carbon (C) only have electrons on the K and L shell. Sodium (Na) and Aluminium (Al) have electrons on the K, L and M shells while Potassium (K) has electrons on the K, L, M and N shells.

So, the larger the electronic configuration, the larger the atomic radius and thus atomic size.

So, they increase in the order B, C, Na, Al, K

3 0

3 years ago