Give the number of valence electrons for each of the following: Ba, Al, P, Se, Br, K

Answers

Answer 1

Answer: Ba: 2
Al: 3
P: 5
Se: 6
Br: 7
K: 1

Hope this helps!

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The smallest part of an element that can still be identified as that element is a(n) _____. (A) molecule (B) proton (C) electron (D) atom
Which substance is an Arrhenius acid?(1) LiF(aq) (3) Mg(OH)2(aq)(2) HBr(aq) (4) CH3CHO
Given that the molar mass of NaOH is 40.00 g/mol, what mass of NaOH is needed to make 2.500 L of a 2.000 M NaOH solution?

The following reaction does not proceed to form a product: H2O + Au---> no reaction. Why is that?. . A. Gold has a higher activity than hydrogen and cannot replace it.. . B. Gold has a lower activity than hydrogen and cannot replace it.. . C. The reaction cannot occur because water is a reactant.. . D. The reaction proceeds too slowly to create products..

Answers

I think the correct answer from the choices listed above is option B. The following reaction does not proceed to form a product: H2O + Au---> no reaction because gold has a lower activity than hydrogen and cannot replace it. Hope this answers the question.

if you make a solution by dissolving 1.0 mol of Fecl3 into 1 kg of water how would the osmotic pressure of this solution compare with the osmotic pressure of a solution that is made from 1.0 mol of glucose in 1 kg of water

Answers

Explanation:

Osmotic pressure is defined as the minimum pressure which has to applied on the solution to prevent the entry of the solvent in the solution through a semi-permeable membrane.

It is a type of colligative property which means it depends on the amount of the solution. More the amount, more will be the osmotic pressure.

Mathematically,

$\pi =icRT$

$\pi$ = Osmotic pressure

i = Vant's Hoff factor which is 1 for non-electrolyte solutions

c = Concentration of solution

R = Solution constant

T = temperature

For $FeCl_3$

As Ferric chloride is an electrolyte, so it will completely dissociate into its ions.

1 mole of ferric chloride will dissociate into 1 $Fe^(3+)$ ion and 3 $Cl^-$ ions.

$FeCl_3\rightarrow Fe^(3+)+3Cl^-$

Here, value of i = 4

For Glucose

Glucose is a non-electrolyte and hence will not dissociate into the respective ions. So, value of i = 1

Osmotic pressure will be high for high value of 'i'. Therefore, osmotic pressure of $FeCl_3$ will be high as compared to the glucose in same amount of water.

The osmotic pressure is greater in the FeCl3 solution. The FeCl3 is an ionic compound, so it dissociates into Fe3+ and 3Cl-, creating 4 overall particles, while the glucose remains as 1 particle. The water increases in the FeCl3 to compensate for that added particle concentration.

What two types of compounds is water especially good at dissolving?

Answers

Answer:

ions and polar molecules

A serving of fish contains 50 g protein and 4 g of fat. If protein has a caloric value of 4 kcal/g and fat has 9 kcal/g, how many kcal are in the serving? Round off the energy value for each food group to the tens place.

Answers

Answer: 240

Explanation:

Final answer:

A serving of fish contains 236 kcal.

Explanation:

To find the number of kilocalories (kcal) in a serving of fish, we need to calculate the energy from protein and fat separately and then add them together. The energy from protein is calculated by multiplying the amount of protein by its caloric value of 4 kcal/g. So, 50 g of protein provides (50 g) x (4 kcal/g) = 200 kcal. The energy from fat is calculated in the same way, so 4 g of fat provides (4 g) x (9 kcal/g) = 36 kcal. Finally, we add the energy from protein and fat together, resulting in a total of 200 kcal + 36 kcal = 236 kcal in the serving of fish.

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The sense of touch is produced by______ within the skin. dermis,muscles,neurons,feelings

Answers

Neurons is the correct answer.

which of the following is a strong electrolyte. sugar, sodium chloride, honey vinager, carbon tetrachloride?

Answers

Electrolyte is a substance, once dissolved in water, produces an electically conducting solution or current. Electrolytes are classified as weak electrolytes or strong electrolytes.

Sugar is a nonelectrolyte. It does dissolve in water but it dissolves as molecules not ions.

Sodium chloride is a strong electrolyte. It dissolves as 100% ions in solutions.

Honey vinegar. some acid found in vinegar are considered weak electrolytes.

Carbon tetrachoride is not an electrolyte. It doesn't break down into ions because its bond is very strong and doesn't break under normal conditions of a solution.

Final answer:

Sodium chloride is the strong electrolyte among the options provided. Strong electrolytes are substances that completely dissociate into ions when dissolved in water. Other examples of strong electrolytes include strong acids like hydrochloric acid and strong bases such as sodium hydroxide.

Explanation:

Among the options provided, sodium chloride is a strongelectrolyte. Electrolytes are substances that yield ions when dissolved in water. Specifically, strong electrolytes dissociate completely into ions when dissolved, leading to high conductive capacity, which is characteristic of strong electrolytes such as sodium chloride. Other substances like sugar, vinegar, or carbon tetrachloride, do not dissociate into ions when dissolved, making them non-electrolytes rather than strong electrolytes.

Examples of other strong electrolytes include strong acids like hydrochloric acid (HCl), which fully dissociates into hydrogen and chloride ions. Strong bases like sodium hydroxide (NaOH) are also strong electrolytes as they readily donate OH¯ when dissolved in water. On the other hand, weak acids and bases, such as the acids in tomato juice or vinegar, do not completely dissociate and are considered weak electrolytes.

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