Ask question

Ask question

All categories

aleksandrvk [35]

3 years ago

13

Question 7 (Essay Worth 5 points)

2 answers:

Leya [2.2K]3 years ago

6 0

Answer:

other person said it!!

Explanation:

Lubov Fominskaja [6]3 years ago

5 0

The periodic table of elements is divided into columns and rows. The vertical columns represent the groups while the horizontal rows represent the periods. A group of elements usually have similar physical and chemical properties. The first column of the periodic table is made up of 7 elements including SODIUM.

1. The name of the element chosen is sodium and its chemical symbol is Na.

2. Sodium is a metal and thus it has metallic properties.

3. Sodium belongs to group one elements whose family name is ALKALI METALS.

4. The neutral atom of sodium is made up of 11 protons, 11 electrons and 12 neutrons.

You might be interested in

Use the Debye-Huckel Equation to calculate the activity coefficient of Ce4+ at μ = 0.070 M.

Dmitriy789 [7]

english please so i can help

8 0

3 years ago

Using the molarity equation, calculate how many grams of salt you need in order to make 80ml of a 2M solution (MW = 58.44g/mole)

ollegr [7]

Answer:

9.35g

Explanation:

The molarity equation establishes that:

$\textrm{molarity}=\frac{\textrm{moles of solute}}{\textrm{liters of solution}}$

So, we have information about molarity (2M) and volume (80 ml=0.08 l), with that, we can find the moles of solute:

$\textrm{moles of solute}=\textrm{molarity}*\textrm{liters of solution}$

$\textrm{moles of solute}= 0.08 \textrm{ l} *2\textrm{ M} = 0.16 \textrm{ mol}$

The mathematical equation that establishes the relationship between molar weight, mass and moles is:

$\textrm{molar weight}= \frac{\textrm{mass}}{\textrm{moles}}$

$\textrm{MW}= \frac{\textrm{m}}{\textrm{n}}$

We have MW (58.44g/mole) and n (0.16 mol), and we need to find m (grams of salt needed) to solve the problem:

$\textrm{m} = \textrm{MW * n}= 58.44\frac{\textrm{g}}{\textrm{mol}} * 0.16 \textrm{ mol} = 9.35 \textrm{ g}$

8 0

3 years ago

Which activity best demonstrates Ernest Rutherford’s creativity?

LenaWriter [7]

with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.

4 0

3 years ago

Here the answers for what is radiation?

Aleonysh [2.5K]

Transferring heat through electromagnetic waves

5 0

3 years ago

Read 2 more answers

In the process of either ___ or ___ negatively charged ___ the reacting atoms form ___

yarga [219]

In the process of either gaining or losing negatively charged electrons the reacting atoms form ions.

4 0

3 years ago