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3 years ago

What do elements in the same column of the periodic table have in common?

Chemistry

2 answers:

pishuonlain [190]3 years ago

5 0

Answer:

The elements in each group have the same number of electrons in the outer orbital. those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.

Oxana [17]3 years ago

5 0

Answer:

They have similar chemical properties!

Explanation:

A column of periodic table is called a group. Elements in a group have similar properties. Like group 1 elements, Lithium and Sodium are extremely reactive. They both fall under same group which is group 1.

They also have same number of valence electrons this is one of the reasons why they have similar chemical properties.

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3. The molar volume of a gas at STP occupies 0 1 kilopascal O ooc 12 grams 22.4 L

Reil [10]

The molar volume of a gas at STP occupies 22.4 L.

Option D

Explanation:

To find the volume of 1 mole of a gas at STP, we use the Ideal Gas Law. It is the general gas equation which gives the relation to the measurable quantities to an ideal gas as below,

P (pressure) × V (volume) = n (number of moles) × R (the gas constant) × T (temperature in Kelvin)

STP = 1 atm of pressure and 273 K for temperature

P = 1 atm

V = ?

n = 1 mole

R = 0.0821 atm L/mol K

T = 273 K

Using the equation,

$\mathrm{PV}=\mathrm{nRT}$

$V=\frac{n R T}{P}$

By substituting the above values, in the equation,

$V=\frac{1 \times 0.082 \times 273}{1}=22.38\ L$

V = 22.38 L

8 0

3 years ago

The production of water proceeds according to the following equation.

dem82 [27]

Answer:

Place the reactants in a smaller container.

Explanation:

If you were to reduce the source of heat, the hydrogen and oxygen molecules would lose their kinetic energy, resulting in less collisions.

_______________________________________________________

Maintaining the same temperature of the reactants, the speed would neither increase nor decrease as temperature is directly proportional to the kinetic energy of the molecules, which in turn is directly proportional to the number of collisions. However, placing the reactants in a smaller container would result in less volume, and hence the molecules would collide with one another more often!

Hope that helps!

4 0

3 years ago

7. What is the unit for Mass? * 1 poin Kg S N m/s

olga_2 [115]

Answer:

kilograms is the unit for mass

6 0

3 years ago

How many mL of 0.100 M NaOH are needed to neutralize 50.00 mL of a 0.150 M solution of CH3CO2H, a monoprotic acid? How many mL o

Rama09 [41]

Answer:

We need 75 mL of 0.1 M NaOH ( Option C)

Explanation:

Step 1: Data given

Molarity of NaOH solution = 0.100 M

volume of 0.150 M CH3COOH = 50.00 mL = 0.05 L

Step 2: The balanced equation

CH3COOH + NaOH → CH3COONa + H2O

Step 3: Calculate moles of CH3COOH

Moles CH3COOH = Molarity * volume

Moles CH3COOH = 0.150 M * 0.05 L

Moles CH3COOH = 0.0075 moles

Step 4: Calculate moles of NaOH

For 1 mol of CH3COOH we need 1 mol of NaOH

For 0.0075 mol CH3COOH we need 0.0075 mole of NaOH

Step 5: Calculate volume of NaOH

volume = moles / molarity

volume = 0.0075 moles / 0.100 M

Volume = 0.075 L = 75 mL

We need 75 mL of 0.1 M NaOH

7 0

3 years ago

3. There are 635,000 J in snack food. What would that equal in kJ?

vesna_86 [32]

635kJ, 1kJ = 1000J and 635000J would be equal to 635kJ

5 0

3 years ago