What is the group of elements with the same number of valence electrons?

Which material is a mixture? 1. water 2. air 3. methane 4. magnesium

skelet666 [1.2K]

Pure air is a mixture of several gases that are invisible and odorless. Consists of 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide.

3 0

3 years ago

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1) The temperature inside my refrigerator is about 40 Celsius. If I place a balloon in my fridge that initially has a temperatur

viva [34]

Answer: The volume of the balloon when it is fully cooled by my refrigerator is 0.3 L

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=0.5L\\T_1=220^oC=(220+273)K=493K\\V_2=?\\T_2=40^oC=(40+273)K=313K$

Putting values in above equation, we get:

$\frac{0.5}{493}=\frac{V_2}{313}\\\\V_2=0.3$

Thus the volume of the balloon when it is fully cooled by my refrigerator is 0.3 L

4 0

3 years ago

A student was asked to name an element that reacts like chlorine (Cl). Which element should the student name?

kramer

Answer:

Bromine (BR2)

Explanation:

Cl2 + Br2 = ClBr

5 0

3 years ago

The range in size of most atomic radii is approximately _____.5 × 10−11 m to 2 × 10−10 m2 to 5 nm5 × 10−21 m to 2 × 10−20 m2 to

Komok [63]

A) 5*10-11 m to 2*10-10 m

4 0

3 years ago

Please help,due in one hour I only need the number of atoms of each element

Liula [17]

Answer:

Sodium sesquicarbonate

Sodium carbonate, Na2CO3, (also known as washing soda, soda ash and soda crystals) is the inorganic compound with the formula Na2CO3 and its various hydrates. All forms are white, water-soluble salts that yield moderately alkaline solutions in water. Is surrounded roughly tetrahedrally by four atoms, two sodiums and two oxygens. As commonly observed in hydrate structures, the water oxygen is surrounded in this way by two cations and two anions, and in this matter sodium sesquicarbonate obeys the usual rule.

Sodium (Na), chemical element of the alkali metal group (Group 1 [Ia]) of the periodic table. Sodium is a very soft silvery-white metal.

Sodium is a chemical element with the symbol Na (from Latin "natrium") and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is 23Na.

The common name for the chemical compound with the formula 3H2O is water. The H2O part is the formula for water. The 3 means that there are 3 molecules of water.

3H2O has 6 hydrogen atoms and 3 oxygen atoms.

Carbon monoxide (Co)

Carbon monoxide is a colorless, odorless gas. Prolonged exposure to carbon monoxide rich atmospheres may be fatal. It is easily ignited. It is just lighter than air and a flame can flash back to the source of leak very easily. Under prolonged exposure to fire or intense heat the containers may violently rupture and rocket.

Carbon monoxide is a colorless, odorless, tasteless gas. A molecule of carbon monoxide (CO) contains one carbon atom and one oxygen atom.

Iron oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO) the rarer form, and iron(II,III) oxide (Fe3O4) which naturally as magnetite. Since atoms are not divisible into halves, we should instead say that in the ferric molecule there are 3 oxygen atoms for every 2 iron atoms. Thus, (Fe is the symbol for an iron atom, and O is the symbol for an oxygen atom) the ferrous oxide molecule is FeO, and the ferric oxide molecule is Fe2O3.

Aluminium hydroxide, Al(OH)₃, is found in nature as the mineral gibbsite and its three much rarer polymorphs: bayerite, doyleite, and nordstrandite. Aluminium hydroxide is amphoteric in nature, i.e., it has both basic and acidic properties. 1 atom.

Hope this is what you are looking for!

Explanation:

Brainliest please?

5 0

3 years ago