Which of the following is true about ions

Answers

Answer 1

Answer: Well, ionic bonds in chemistry are a bond between a metal and a non metal (left side of the periodic table and right)

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Uncontrolled hypertension can lead toA. heart attack.
B. stroke.
C. kidney damage.
D. all of the above.

Answers

All of the above,this can lead to stokes, heart attacks and kidney damage.
Hypertension puts pressure on the blood vessel walls which can damage them, the vessels in your heart, brain and other organs can be damaged by uncontrolled hypertension.

Elements have been discovered with up to how many energy levels

Answers

20 because each row has 20 columns

Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO 2Hg + O2 The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2? 3.906 7.813 15.63 73.87

Answers

Answer:

15.63

Explanation:

250g O2 x 1 mol O2 x 2mol HgO / 32 g O2 x 1 mol O2

How many moles are in 987 grams of Ra(OH)2?

Answers

The number of moles in 987 grams of Ra(OH)2 = 3.8 moles

Calculating number of moles

Ra = 226g

O= 16g

H = 1

Therefore molar mass of Ra(OH)2= 226+ (16+1)×2

= 260g/mol

The molar mass of Ra(OH)2 = 260g/mol

Thus means that 260g of Ra(OH)2 makes up 1 mole

Therefore, 987 g = X moles

Make X moles the subject of formula,

X mole = 987/260

= 3.8 moles

Therefore, the number of moles in 987 grams of Ra(OH)2 = 3.8 moles

Learn more about molar mass here:

brainly.com/question/14469428

Answer : 3.79 moles are in 987 grams of $Ra(OH)_2$ .

Solution : Given,

Mass of $Ra(OH)_2$ = 987 g

Molar mass of $Ra(OH)_2$ = 260 g/mole

Now we have to calculate the moles of $Ra(OH)_2$ .

Formula used :

$\text{Moles of }Ra(OH)_2=\frac{\text{Mass of }Ra(OH)_2}{\text{Molar mass of }Ra(OH)_2}$

Now put all the given values in this formula, we get the moles.

$\text{Moles of }Ra(OH)_2=(987g)/(260g/mole)=3.79moles$

Therefore, 3.79 moles are in 987 grams of $Ra(OH)_2$ .

A mixture that appears to contain only one substance is a ?

Answers

if you're talking about atoms then its a molecule

Answer:homogeneous mixture

Explanation:

Answer the following questions: On a 10-fold dilution of a weak acid, the pH will ______________ . On a 10-fold dilution of a weak base, the pH will ______________. If one adds a very small amount of strong base to a buffered solution, the pH will _______________. Can you make a buffer using a strong acid

Answers

Answer:

i) increase

ii) decrease

iii) remain the same

iv) No, because it dissociates completely.

Explanation:

On a 10-fold dilution of a weak acid, the pH will increase because the concentration of hydrogen ions will decrease thereby increasing the pH to close to that of water.

On a 10-fold dilution of a weak base, the pH will decrease due to the removal of hydroxide ions from the solution. This results in the solution having a H closer to that of water.

If one adds a very small amount of strong base to a buffered solution, the pH will remain constant because a buffer solution acts to withstand any change to its pH on the addition of small quantities of either an acid or a base.

A buffer solution cannot be made with a strong acid because thy undergo complete dissociation. Therefore, any small addition of base or acid will result in very large changes in the pH of the solution. A buffer solution is made with a weak acid and its conjugate base or a weak base and its conjugate acid.

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