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2 years ago

9) All elements can be sorted into 3 simple groups:

Chemistry

2 answers:

Dmitrij [34]2 years ago

7 0

Metals, non metals and metallpids

serious [3.7K]2 years ago

6 0

Answer: B) metals, non-metals, metalloids

An example of a metal is iron. A non-metal example is oxygen, which is a gas at STP (standard temperature and pressure).

A metalloid is a bit of a mix between a metal and non-metal element. It's sorta like an element that has both properties of metals and non-metals, or it's in a murky gray area. An example of a metalloid would be silicon.

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who reported four “element” classifications, but included some substances that were combinations of elements rather than true el

kozerog [31]

Answer: Antoine Lavoisier.

He classified the elements into four groups: elastic fluids, nonmetals, metals and earths. Some of the called elementes were not really elements (light and heat). Others were compounds, e.g. hydrochloric acid.

7 0

3 years ago

Read 2 more answers

If 10.62 mL of a standard 0.3330 M KOH solution reacts with 98.20 mL of CH3COOH solution, what is the molarity of the acid solut

Nikolay [14]

Answer:

0.036 M of $CH_{3} COOH$

Explanation:

It is an example of acid-base neutralization reaction.

KOH + $CH_{3} COOH$ ----> $CH_{3} COO^{-} K^{+}$ + $H_{2}O$

Base Acid Salt

When two component react then the number of moles of both the component should be same, therefore the number of moles and acids and bases should be the same in the following .

Molarity= $\frac{\textrm{No. of Moles}}{\textrm{Volume of the Particular Solution}}$

No.of moles= Molarity × Volume of the Particular Solution

Therefore,

$M_{1}V_{1} =M_{2}V_{2}$ ------------------------------(1)

where

$M_{1}$ = Molarity of Acid

$V_{1}$ = Volume of Acid

$M_{2}$ = Molarity of Base

$V_{2}$ = Volume of Base

$M_{1}$ =0.3330 M

$V_{1}$ =10.62 mL

$V_{2}$ =98.2 mL

$M_{2}$ =??(in M)

Plugging in Equation 1,

0.3330 × 10.62 = $M_{2}$ × 98.2

$M_{2}$ = $\frac{0.3330*10.62}{98.2}$

$M_{2}$ =0.036 M

3 0

2 years ago

5. Acid + Metal → a Salt + _______

aliya0001 [1]

The answer is Hydrogen

This is what happens when acids react with metals

5 0

3 years ago

Read 2 more answers

A container of gas has a volume of 3.5 L and a pressure of 0.8 atm. Assuming the temperature remains constant, what volume of ga

vovikov84 [41]

<h3>Answer:</h3>

5.6 L

<h3>Explanation:</h3>

We are given;

Initial volume, V1 = 3.5 L
Initial pressure, P1 = 0.8 atm
Final pressure, P2 = 0.5 atm

We are required to calculate the final volume;

According to Boyle's law, the volume of a fixed mass of a gas and the pressure are inversely proportional at a constant temperature.

That is; P α 1/V
Mathematically, P=k/V
At two different pressure and volume;

P1V1 = P2V2

In this case;

Rearranging the formula;

V2 = P1V1 ÷ P2

= (0.8 atm × 3.5 L) ÷ 0.5 atm

= 5.6 L

Therefore, the resulting volume is 5.6 L

7 0

2 years ago

Write a balanced chemical equation for the standard formation reaction of solid sodium hydrogen carbonate nahco3 .

NNADVOKAT [17]

There are a number of methods of which we can form sodium bicarbonate. This compound is commonly known as baking soda. It can be prepared from the reaction of sodium hydroxide and carbonic acid. Carbonic acid in water dissociates into hydrogen ions and the bicarbonate ion while sodium hydroxide would ionize into sodium ions and hydroxide ions. With this, these ions would react and form the sodium bicarbonate salt and water. The chemical reaction would be expressed as follows:

NaOH + H2CO3 = H2O + NaHCO3

Sodium bicarbonate is used in cooking, as a toothpaste and as a cleaning substance. Also, it is used in medical applications like for the preparation of the dialysate solution.

5 0

2 years ago