If an atom gains some extra electrons so that its valence shell becomes full, what happens to the atom?

How many moles of each element are in one mole of be(oh)2.

Lina20 [59]

Answer:

How many moles of each element are in one mole of Be (OH)2? 1 mole of beryllium, 1 mole of oxygen, 2 moles of hydrogen 1 mole of beryllium, 2 moles of oxygen, 2 moles of hydrogen CORRECT ANSWER 2 moles of beryllium, 2 moles of oxygen, 2 moles of hydrogen

Explanation:

5 0

2 years ago

Choose the compound that exhibits hydrogen bonding as its strongest intermolecular force.

NemiM [27]

Answer:

B

Explanation:

To form hydrogen bondings between the molecules, the compound needs a highly electronegative atom (usually N, O, or F) bonded with a hydrogen atom;

and that the highly electronegative atom has lone pair outermost shell electrons.

In the 5 options, only B (CH3OH) has an N, O, or F atom that has lone pair outermost shell electrons (2 lone pairs on each O atom), so it can form hydrogen bonds within its molecules.

Hydrogen bonds are stronger than the van der Waals' forces between its molecules (that exist regardless of whether there are hydrogen bonds).

4 0

3 years ago

Plan a method the students could use to test their hypothesis.

polet [3.4K]

Hypothesis testing is a formal procedure for investigating our ideas about the world using statistics. It is most often used by scientists to test specific predictions, called hypotheses, that arise from theories.

There are 5 main steps in hypothesis testing:

State your research hypothesis as a null and alternate hypothesis.

Collect data in a way designed to test the hypothesis.

Perform an appropriate statistical test.

Decide whether to reject or fail to reject your null hypothesis.

Present the findings in your results and discussion section.

Though the specific details might vary, the procedure you will use when testing a hypothesis will always follow some version of these step

Table of contents

State your null and alternate hypothesis

Collect data

Perform a statistical test

Decide whether to reject or fail to reject your null hypothesis

Present your findings

Frequently asked questions

If you want this is a Link I found just write the sentence below

Hypothesis Testing | A Step-by-Step Guide with Easy Examples

5 0

2 years ago

What is the concentration of OH − and pOH in a 0.00066 M solution of Ba ( OH ) 2 at 25 ∘ C? Assume complete dissociation.

Allushta [10]

Answer: The hydroxide ion concentration and pOH of the solution is $1.32\times 10^{-3}M$ and 2.88 respectively

Explanation:

We are given:

Concentration of barium hydroxide = 0.00066 M

The chemical equation for the dissociation of barium hydroxide follows:

$Ba(OH)_2\rightarrow Ba^{2+}+2OH^-$

1 mole of barium hydroxide produces 1 mole of barium ions and 2 moles of hydroxide ions

pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution

To calculate pOH of the solution, we use the equation:

$pOH=-\log[OH^-]$

We are given:

$[OH^-]=(2\times 0.00066)=1.32\times 10^{-3}M$

Putting values in above equation, we get:

$pOH=-\log(1.32\times 10^{-3})\\\\pOH=2.88$

Hence, the hydroxide ion concentration and pOH of the solution is $1.32\times 10^{-3}M$ and 2.88 respectively

3 0

3 years ago

Using this equation 2H2+O2–>2H2O when 47g of water are produced, how many grams of hydrogen must react

hoa [83]

You must react 5.3 g H_2 to produce 47 g H_2O.

Step 1. Calculate the moles of H_2O

Moles of H_2O = 47 g H_2O × (1 mol H_2O/18.02 g H_2O) =2.61 mol H_2O

Step 2. Calculate the moles of H_2

Moles of H_2 = 2.61 mol H_2O × (2mol H_2/2 mol H_2O) = 2.61 mol H_2

Step 3. Calculate the mass of H_2

Mass of H_2 = 2.61 mol H_2 × (2.016 g H_2/1 mol H_2) = 5.3 g H_2

6 0

3 years ago