CHEMISTRY HIGH SCHOOL

What is the pH of a Koh solution that has [H+]=1.87×10^-13M

Answers

Answer 1
Answer:

Answer:

12.7

Explanation:
Answer 2
Answer:

Answer:

12.7 not 12.73

Explanation:

I did the assignment

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When you accidentally overfill a water glass, the water takes on a dome-like or convex shape, but a half-filled water glass takes on a concave shape, in which the water is higher at the sides of the glass. This is because:Within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Within the glass, water tries to maximize its surface area, and on top of the glass, water tries to minimize its surface area.

Water's surface tension is greater inside the glass than on top of the glass.

Adhesive forces between water and the glass get weaker with height.

Answers

Answer: The correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Explanation:

Adhesive forces are defined as the molecular forces which are present between different substances. For Example: When water is poured into glass, the molecular forces between the walls of container and water molecules.

Cohesive forces are defined as the molecular forces which are present between same substances.

When water is put in the glass, two types of meniscus form, one is concave meniscus and another is convex meniscus.

Concave meniscus is formed due to adhesive forces and is dominating inside the glass.

Convex meniscus is formed due to cohesive forces and is dominating on the top of glass. As, on the top of glass no walls of glass are present. So, water molecules stick together to other water molecules.

Hence, the correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.
The water is higher at the sides of the glass. This is because within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

In the pie chart below, which of the following represents the amount of Earth's water located in the oceans?A pie chart with part A representing 2%, part B representing .8%, part C representing .2% and part D representing 97%.


A only
A and B
C only
D only

Answers

D Only . 97% is ocean

Answer:

D Only . 97% is ocean

Explanation:

A sample of gas is held at constant pressure. Increasing the Kelvin temperature of this gas sample causes the average kinetic energy of its molecules to(1) decrease and the volume of the gas sample to decrease
(2) decrease and the volume of the gas sample to increase
(3) increase and the volume of the gas sample to decrease
(4) increase and the volume of the gas sample to increase

Answers

Increasing the temperature of a gas sample means that heat energy is been supplied to the System. When energy is been supplied heat energy is transformed into kinetic energy of the gas molecules.
Therefore kelvin temperature increases means more energy given to the system therefore average kinetic energy of molecules increase.
When the kinetic energy of molecules increase they move about more and take up more space. Hence volume too increases.
Therefore the correct answer is
4) average kinetic energy of molecules increase and volume of the gas sample increases
The answer is (4). When the pressure is constant, he temperature increasing can cause both the average kinetic energy of its molecules and the volume of gas sample increase.

Would the remains of a living thing have more or less carbon 14 in it after being buried for 10000 years? Why? Please make the answer no more than 5 sentences

Answers

Yes, because carbon-14 is radioactive and so decays over time. if it is buried, it cannot take up more carbon-14, so the overall c14 levels wil go down.

Which of the following solutions contains the greatest number of ions?. . 1) 200.0 mL of 0.10 M iron (III) chloride. 2) 800.mL of 0.10 M sucrose

Answers

The number of ions is determined by multiplying the given volume and the molarity of the solution. The product is multiplied to the number of ions when the solution dissociates. In this case:

1. 200.0 mL of 0.10 M iron (III) chloride = 0.2*0.1* 4 = 0.08
2. 800.mL of 0.10 M sucrose = 0.8 * 0.1 * 1 = 0.08

The two solutions have the same number of ions. 

Identify the correct formula for each of the following compounds? boron tribromide a. b3br b. bbr3 c. 3bbr

Answers

Answer:

The correct formula for boron tribromide is BBr3 (option b).

In this compound, boron (B) has a valency of 3, and bromine (Br) has a valency of 1. The subscript 3 indicates that there are three bromine atoms bonded to one boron atom.

To determine the correct formula, it's important to understand the valencies of the elements involved. Boron typically has a valency of 3, which means it can form three bonds with other elements. Bromine, on the other hand, has a valency of 1, indicating that it can form one bond.

In boron tribromide, the three bromine atoms each form a single bond with the boron atom. So, the formula is BBr3, indicating one boron atom and three bromine atoms.

It's important to pay attention to the subscripts in a chemical formula, as they indicate the number of atoms present in the compound. In this case, the subscript 3 indicates that there are three bromine atoms bonded to one boron atom. If the formula were written as B3Br or 3BBr, it would imply that there are three boron atoms, which is incorrect.

Remember, when writing chemical formulas, it's crucial to consider the valencies and the number of atoms involved to accurately represent the compound.

Answer: b. BBr3

Explanation:

When we see prefixes such as mono-, di-, and tri-, that indicates the number of atoms of that element. So, tribromide means that there are 3 atoms of bromide. Boron has no prefix, so there is only 1 atom of boron.

So, our final formula is BBr₃.

I hope this helps! :)
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