All categories

3 years ago

Can someone help, please ??

Chemistry

2 answers:

Yuri [45]3 years ago

8 0

13. The periodic table was discovered by Dalton.
14.NaCl is sodium chloride

Zinaida [17]3 years ago

5 0

Number 13 is D. Mendeleev. He was a Russian chemist and inventor who formulated the periodic table.

You might be interested in

How are you guys today? o.0

Lady_Fox [76]

Answer:

not the best but that is alright

Explanation:

how is your day :)

3 0

2 years ago

Read 2 more answers

What pressure (in atmospheres) does a gas exert when at 385 mm of Hg?

Westkost [7]

To find out the pressure in atm. You must divide 385 by 760. So pressure in atmospheres equals 385/760.

6 0

3 years ago

2. What ions are present in what ratio in a solution of aqueous calcium chloride?

Alenkasestr [34]

Answer:

$\mathrm{Ca}^{2+} \text { and } \mathrm{Cl} \text { - ions are present in } 1: 2 \text { ratio in a solution of aqueous calcium chloride. }$

Explanation:

Here in Calcium Chloride ionic bond is present in between calcium and chlorine atoms. As we know according to Octet rule calcium have two excess atoms and for matching nearest noble gas electronic configuration. It donate two electrons to gain more stability and form $\mathrm{Ca}^{2+}$ , while chlorine is deficient from one electron to meet nearest noble gas electronic configuration therefore two chlorine atoms accept excess electron from calcium individually and form two $\mathrm{Cl}^{-}$ ions.

$\text { Equation is as follows: } \mathrm{Ca}^{2+}+2 \mathrm{Cl}^{-} \rightarrow \mathrm{CaCl}_{2}$

Hence aqueous solution of calcium chloride breaks the ionic bond pairing in one $\mathrm{Ca}^{2+}$ and two $\mathrm{Cl}^{-}$ ions: $\mathrm{CaCl}_{2} \longrightarrow \mathrm{H}_{2} \mathrm{O} \quad \mathrm{Ca}^{2+}(\mathrm{ag})+2 \mathrm{Cl}(\mathrm{ag})$

5 0

4 years ago

A magnesium atom has 2 valence electrons in its third shell.

likoan [24]

D. It will lose 2 electrons in order to become stable.

5 0

3 years ago

In which situation is the acceleration of the car negative?

Charra [1.4K]

B) The velocity of the car reduced from 50k/m over one min.

3 0

3 years ago

Read 2 more answers