CHEMISTRY COLLEGE

The higher the pH, the less acidic the solution

Answers

Answer 1
Answer:

If the pH is higher the concentration of hydrogen ions becomes less and the solution becomes less acidic.

As the pH becomes lower, the concentration of hydrogen ions becomes greater, and the solution becomes more acidic.

HOPEIT'SHELPFUL:)
Answer 2
Answer:

Answer:

yh thats true lol, ty for that very interesting fact

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Which of the following shows the abbreviation for an SI unit of density?
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16. Which of the following properties of the elements remain unchanged across#period
A lonivation energy
C Electro negativity
13. Number of shells
D. Nuclear charge​

Answers

Answer:

Number of shells

Explanation:

Across the period on the periodic table, the number of shells remains the same. There is no variation or trend for the number of shells on a period.

  • The number of shell is the energy level corresponding to an atom.
  • As we go from period to period, the energy level increases by 1.
  • The period number corresponds to the number of shells.
  • Elements in period 4 will have 4 shells.
  • There is no variation of any sort in the number of shell across a period.

Classify each of the following as a compound, a homogeneous mixture, or a heterogeneous mixture: (a) orange juice; (b) vegetable soup; (c) cement; (d) calcium sulfate; (e) teas

Answers

Explanation:

A compound is a substance that contains more than two different atoms in a fixed ratio by mass. Elements of a compound are chemically combined together.

A homogeneous mixture is defined as a mixture in which solute particles are uniformly distributed into the solvent.

Whereas a heterogeneous mixture is defined as a mixture in which solute particles are non-uniformly distributed in a solvent.

In both homogeneous and heterogeneous mixture there is no chemical combination between solute and solvent particles.

Therefore, each given substance is classified as follows.

(a) Orange juice :  As it contains pulp of orange along with the liquid which are not present in uniform composition. Hence, orange juice is a heterogeneous mixture.

(b) vegetable soup : This soup also contains vegetable pieces and spices which are non-uniformly distributed. Hence, it is also a heterogeneous mixture.

(c) cement : It contains several different compound present in definite composition. Hence, cement is a homogeneous mixture.

(d) calcium sulfate : Its chemical formula is CaSO_(4) and in this compound both calcium and sulfate atoms are chemically combined together. Therefore, calcium sulfate is a compound.

(e) Tea : It is a homogeneous mixture as there is uniform composition of tea water in milk.

Calculate the volume of 8.87×10-2 M calcium hydroxide required to neutralize 15.0 mL of a 0.389 M hydrobromic acid solution. mL

Answers

Answer : The volume of calcium hydroxide is, 32.89 ml

Explanation :

Using neutralization law,

n_1M_1V_1=n_2M_2V_2

where,

n_1 = basicity of an acid = 1

n_2 = acidity of a base = 2

M_1 = concentration of hydrobromic acid = 0.389 M

M_2 = concentration of calcium hydroxide = 0.0887 M

V_1 = volume of hydrobromic acid = 15 ml

V_2 = volume of calcium hydroxide = ?

Now put all the given values in the above law, we get the volume of calcium hydroxide.

1* 0.389M* 15ml=2* 0.0887M* V_2

V_2=32.89ml

Therefore, the volume of calcium hydroxide is, 32.89 ml

Fruits and vegetables exposed to air begin to brown because of a chemical reaction in their cells. This may result in these foods being thrown out. Some people have found that adding lemon juice (citric acid) to apple slices keeps them from turning brown. The prevention of browning is likely the result of *increasing the concentration of enzymes
increase in the temperature
slowing the rate of enzyme reaction
maintaining the pH

Answers

The prevention of fruits browning is the result of :

>slowing the rate of enzyme reaction

How is the browning of fruits prevented?

The browning of fruits can be slowed down by preventing the enzyme from working properly. Lemon juice contains an acid which can stop enzymes from working properly. For example, water and sugar in jam prevents oxygen in the air to reach enzymes and hence protects from browning.

Always keep cut fruits such as apples, pears and peaches from turning brown by coating them with an acidic juice such as lemon or orange.

The enzyme that is responsible for the browning is called polyphenol oxidase. PPO enzyme in the presence of oxygen changes substances known as phenolic compounds, through oxidation, into quinones.

To know more about enzymes, refer

brainly.com/question/14577353

#SPJ2

Answer:

slowing the rate of enzyme action

Explanation:

What would be the effect on the observed melting point of sample were poorly packed?

Answers

if a sample is packed poorly, the sample will not heat evenly and will take longer to melt.

What is the specific heat value of brass?

Answers

Answer:

Nhiệt dung riêng của đồng là  

380

J

/

k

g

.

K

Explanation:
0.380 0.092
T4: Specific Heats and Molar Heat Capacities
Substance cp in J/g K cp in cal/g K or Btu/lb F
Aluminum 0.900 0.215
Bismuth 0.123 0.0294
Copper 0.386 0.0923
Brass 0.380 0.092
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