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-BARSIC- [3]
3 years ago
9

What do elements of the same group have in common

Chemistry
1 answer:
andrew11 [14]3 years ago
4 0
Answer and explanation:

Elements of the same group have the same number of valence electrons, therefore they behave similarly. For example in group 2, alkaline earth metals, all the elements have two valence electrons.
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3.25 x 10+8 nm2 divide by 6.5 x 10+6 nm =
Vesnalui [34]

Answer:  50 nm

Explanation:  Two steps:

1.  Divide 3.25/6.5 = 0.5

2.  Divide 10^8/10^6 = 10^2

nm^2/nm = nm

Combine:  0.5x10^2 nm

or 50 nm

8 0
3 years ago
How many molecules of sodium chloride are in 2.5 moles??
sergiy2304 [10]

Answer:

1.5x1024

Explanation:

7 0
3 years ago
Neon is an inner gas because it’s outer ____ is full of electrons.
Fynjy0 [20]

Answer:

Neon is an inner gas because it’s outer <u>__shell__</u> is full of electrons.

7 0
3 years ago
The expected value for a chemical equation is 47g of water, after an experiment you find that you have 2.58 moles of water. What
strojnjashka [21]
<h3><u>Answer</u>;</h3>

Actual yield = 46.44 g

<h3><u>Explanation;</u></h3>

1 mole of water = 18 g/mol

Therefore;

The experimental yield = 2.58 moles

equivalent to ; 2.58 × 18 = 46.44 g

The theoretical value is 47 g

Percentage yield = 46.44/47 × 100%

                             = 98.8%

The questions asks for actual yield = 46.44 g

6 0
3 years ago
A 4.0 L container holds a sample of hydrogen gas at 306 K and 150 kPa. If the pressure increases to 300 kPa and the volume remai
riadik2000 [5.3K]

Answer:

612 K

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T₁) = 306 K

Initial pressure (P₁) = 150 kPa

Final pressure (P₂) = 300 kPa

Volume = 4 L = constant

Final temperature (T₂) =?

Since the volume is constant, the final (i.e the new) temperature of the gas can be obtained as follow:

P₁ / T₁ = P₂ / T₂

150 / 306 = 300 / T₂

Cross multiply

150 × T₂ = 306 × 300

150 × T₂ = 91800

Divide both side by 150

T₂ = 91800 / 150

T₂ = 612 K

Thus, the new temperature of the gas is 612 K

4 0
3 years ago
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