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Olin [163]
3 years ago
5

Which element is located in group 2 period 2 on the periodic Table?

Chemistry
2 answers:
AnnZ [28]3 years ago
4 0

Answer:

Berilium is located in period 2 group2

Explanation:

you are welcome

irga5000 [103]3 years ago
4 0

Answer:

Berylium

Explanation:

it has two valence electrons in its outermost shell which makes it belong to the GROUP 2. It's atomic number is 004 which makes its electrons occupy up till the second shell only, this, making it belong to the PERIOD 2.

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a person in a head-on car crash collision, who is not wearing a seat belt, continues to move forward at the original speed of th
Inessa [10]
They will continue moving because an object in motion will stay in motion until acted upon by a new force. I believe this is Newton's Law of Motion.
4 0
4 years ago
Titration of 0.824 g of potassium hydrogen phthalate required 38.314 g of naoh solution to reach the end point detected by pheno
melamori03 [73]

1.062 mol/kg.

<em>Step 1</em>. Write the balanced equation for the neutralization.

MM = 204.22 40.00

KHC8H4O4 + NaOH → KNaC8H4O4 + H2O

<em>Step 2</em>. Calculate the moles of potassium hydrogen phthalate (KHP)

Moles of KHP = 824 mg KHP × (1 mmol KHP/204.22 mg KHP)

= 4.035 mmol KHP

<em>Step 3</em>. Calculate the moles of NaOH

Moles of NaOH = 4.035 mmol KHP × (1 mmol NaOH/(1 mmol KHP)

= 4.035 mmol NaOH

<em>Step 4</em>. Calculate the mass of the NaOH

Mass of NaOH = 4.035 mmol NaOH × (40.00 mg NaOH/1 mmol NaOH)

= 161 mg NaOH

<em>Step 5</em>. Calculate the mass of the water

Mass of water = mass of solution – mass of NaOH = 38.134 g - 0.161 g

= 37.973 g

<em>Step 6</em>. Calculate the molal concentration of the NaOH

<em>b</em> = moles of NaOH/kg of water = 0.040 35 mol/0.037 973 kg = 1.062 mol/kg

3 0
4 years ago
Air pressure is typically mesuared with a
Alex Ar [27]
The answer is:  "barometer" .
_______________________________________________
8 0
3 years ago
Which of the two compounds, H_2NNH_2 and HNNH, has the strongest nitrogen-nitrogen bond, and which has the shorter nitrogen-nitr
cricket20 [7]

Answer:

d. HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

Explanation:

The Lewis structure of HNNH comprises of a double bound between the two nitrogen atoms, therefore each nitrogen still carrying a lone pair of electron and  a single bond between each nitrogen to it respective hydrogen.

Also for H_2NNH_2; there exists a single nitrogen to nitrogen bond because hydrogen is sharing two bonds already with the nitrogen; the nitrogen also possess a lone pair of electron and the last bond is a single bond between the nitrogen to nitrogen atom ( therefore obeying the octet rule).

The bond strength and bond angle is stronger and shorter in double bonds than single bonds, thus HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.

3 0
4 years ago
***30 POINTS!!!!
satela [25.4K]

Answer:

Approximately 241 kJ/mol reaction.

Explanation:

How many moles of the reaction took place?

The coefficient in front of both NaOH and HCl are both one. In other words, one mole of the reaction will require one mole of NaOH and one mole and HCl.

\rm0.025\; L \times 0.100\; mol\cdot L^{-1} = 0.0025\; mol of both NaOH and HCl are available. As a result, 0.0025 moles of the reaction would have taken place.

How much heat was produced?

Approximate volume of the solution:

\rm 25.0 + 25.0 = 50.0\; mL.

Approximate mass of the solution:

\rm 50.0\; mL\times 1\;g\cdot mL^{-1} = 50.0\; g.

Q = c\cdot m \cdot \Delta T = \rm 50.0\; g \times 4.812\; J \cdot g^{-1} \cdot K^{-1} \times (25.5 - 23.0)\; K = 601.5\; J

Enthalpy change per mole reaction:

\displaystyle \Delta H = \frac{Q}{n} = \rm \frac{601.5\; J}{0.025\; mol} \approx 241000\; J\cdot mol^{-1} = 241\; kJ \cdot mol^{-1}.

6 0
4 years ago
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