CHEMISTRY HIGH SCHOOL

Several substances are labeled on the pH scale below.A p H scale is shown ranging from 0 the top to 14 at the bottom. The approximate locations of substances are: gastric fluid, 1.2; lemon juice, 2.2; milk, 6.5; blood, 7.5; seawater, 8; milk of magnesia, upper M g (upper O upper H) subscript 2 solution, 10.5; household lye, upper N a upper O upper H solution, 13.5.

Which substance has the lowest [H+] concentration but is still considered an acid?

Answers

Answer 1
Answer:

Answer:

(A) - Milk

Explanation:

Acids cannot go below the 7 mark, and milk is the last one right before 7

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Formula of velocity rate​

The amount of energy a person can consume throughout the day without gaining weight is extremely dependent onA. hunger.
B. appetite.
C. culture.
D. activity level.

Answers

I'm quite sure it's activity level. One other thing that could've been said is metabolism, but that isn't there. However, food is consumed for the body to have energy, and without that energy we wouldn't be able to function. And when we let that intake of food settle, it's stored as fat. But because of activity level, we are capable of burning those calories. 

D is the answer you are looking for. 

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.

The compounds KNO3 and NaNO3 are soluble in water.55 Compare the entropy of 30. grams of solid KNO3 at 20.°C with the entropy of 30. grams of KNO3 dissolved in 100. grams of water at 20.°C. [1]


56 Explain why the total thermal energy of a sample containing 22.2 grams of NaNO3 dissolved in 200. grams of water at 20.°C is greater than the total thermal energy of a sample containing 11.1 grams of NaNO3 dissolved in 100. grams of water at 20.°C. [1]


57 Compare the boiling point of a NaNO3 solution at standard pressure to the boiling point of water at standard pressure. [1]

Answers

55) Answer==>   the solid has less entropy
56) Answer==> 22.2g produces more heat than 11.1g when dissolved
57) Answer==> the solution has a higher boiling point

The cube has a mass of 72.9 g.What is its density in g/cm3?

What substance is it?

Answers

If the cube is 3 cm on each side, then it has a volume of 27 cm^3 (3 x 3 x 3). Density is mass divided by volume, so its density is 72.9/27 = 2.7 g/cm^3. 

Going by the density, the cube is made of Aluminium - density is a fairly unique quantity

Answer: aluminum and 2.7

Explanation:

How many moles of lithium oxide will form if 1.68 mol of lithium react?

Answers

Based on the chemical equation, 4 moles of lithium reacts with 1 mole of oxygen to produce 2 moles of lithium oxide.
First of all you need to find 1 mole of Lithium by diving 1.68 mol by 4 and the answer should be 0.42 mol. To calculate the no. of moles of lithium oxide, you've to multiply 0.42 mol by 2. Hence the answer, 0.84 mol.

Which of the following instruments is used to measure air pressure? A. Thermometer
B. Barometer
C. Hygrometer
D. Anemometer

Answers

The barometer is used to measure air pressure. 

Answer: Barometer 
A barometer measures air pressure

The first barometer was invented in the early 1600. The first barometer had mercury in a small basin with an upside down glass tube placed in the mercry.
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