CHEMISTRY HIGH SCHOOL

Which characteristic would you predict from a solution that has a pH of 5?sour taste
very high concentration of hydroxide ions
slippery feeling
very low concentration of hydronium ions

Answers

Answer 1
Answer:

Answer : The correct option is, sour taste

Explanation :

Acid : It is a substance that has ability of donating proton or hydrogen ion or hydronium ion, H^+.

The properties of an acid are :

  • Acids are sour in taste.
  • The texture of an acid solution is sticky.
  • It changes the color of the litmus paper to red.
  • It react with a metal to give compound and hydrogen gas.
  • The pH of an acid is less than 7.

Base : It is a substance that has ability of donating hydroxide ion, OH^-.

The properties of an base are :

  • Base are bitter in taste.
  • The texture of an base solution is slippery.
  • It changes the color of the litmus paper to blue.
  • It does not react with a metal.
  • The pH of a base is more than 7.

As per question, the pH is 5 that means the solution is acidic in nature and follow the properties of an acid. So, the pH = 5 has the sour taste characteristic. While the other options are the properties of a base.

Hence, the correct option is, sour taste
Answer 2
Answer: With a pH of five, it would mean that this substance is a weak acid one would also it expect it would be sour.

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In which state of matter are the particles close together and highly organized? A. Solid. B. Liquid. C. Gas. D. All of the choices are correct.

Answers

Answer:

A. Solid

Explanation:

that is what creates a solid state. the particles are moving slowly enough (the matter is cold enough) that stable structures between them can be established. so, they get close together and create e.g. grids.

What is binary fission

Answers

Binary fission: Asexual reproduction by division of nuclear materials in prokaryotes.


I hope that's help:0

Mark and Ann took a two week hiking trip through Yosemite National Park. While hiking through the park they witnessed two large blocks of rock break away from Glacier Point. What is the initial transfer of energy that accelerates the rock down the side of the mountain?

Answers

Potential energy. The energy you gain when it is at rest. 

Potential energy is converted into kinetic energy.

The specific heat of a solution is 4.18 J/(g•°C)and its density is 1.02 g/mL. The solution is formed by combining 25.0 mL of solution A with 25.0 mL of solution B with each solution initially at 21.4°C. The final temperature of the combined solution is 25.3°C. Calculate the heat of reaction, q, assuming no heat loss due to the calorimeter. I got 831 J
The part I cannot figure out is the question afterwards which is If the calorimeter has a heat capacity of 8.20 J/°C and a correction is included to account for the heat absorbed by the calorimeter what is the heat of reaction q

Answers

Answer:

a. qrxn = 831 J

b. 863 J

Explanation:

we know that density is the mass of a substance per unit volume

d=mass/volume

the volume of the solution is the combination of solution A and solution B

1.02 g/mL=mass/(25+25)

mass=50*1.02

mass=51g

Recall that Q=mCdT

mass=m, C=specific heat capacity

dT=change in temperature

qrxn = (51 g)(4.18 J/g⋅°C)(25.3 °C - 21.4 °C)

qrxn = 831 J

2.Heat=Heat capacity *change in temperature

qcal = (8.20 J/°C)((25.3 °C - 21.4 °C)

qcal = 31.98 J

qrxni + qcal = qrxn

qrxn = 831 J + 32.0 J

863 J------Heat of reaction

863 J =(51 g)(Heat Capacity)(25.3 °C - 21.4 °C)

4.34 J/g⋅°C
Okay, so, to solve for this, we're going to have to use q = mcΔT. However, the mass of the calorimeter is not important because not of it is used in the reaction, so really, we are only looking at 2 things, the temperature change and specific heat. So, here is the lightly modified equation we will use:
q = cΔT

Now, just plug in the ΔT we had for the original equation (which was 3.9) and use the specific heat of the calorimeter to get q.

q = (8.20) * (3.9)
q = 31.98, or about 32

The 32 is what was absorbed by the calorimeter, so we can add that to the original value to get our answer.
831 + 32 = 863 J

So, the answer is 863 J

Hope this helped!! :D

Which of the following uses the relationship between the DNA of various groups of organisms to determine how long ago they diverged evolutionarily from one another? Carbon dating
Fossils
Timelines
Molecular clocks

Answers

Molecular clocks use the relationship between the DNA of several groups of organisms to evaluate how long ago they diverged evolutionarily from one another. Therefore, option (4) is correct.

What are Molecular clocks?

The molecular clock can be described as a figurative term for a technique that utilizes the mutation rate of biomolecules to determine the time when two or more life forms diverged. The biomolecular data used are usually nucleotide sequences for DNA, RNA, or amino acid sequences for proteins.

The benchmarks for calculating the mutation rate are often fossil or archaeological dates. The molecular clock is commonly used in molecular evolution to estimate times of speciation or radiation.

The molecular clock can only give one time period as it cannot assign concrete dates. For viral phylogenetics and ancient DNA studies, the areas of evolutionary biology, the intermediate samples can be utilized to more precisely calibrate the molecular clock.

Learn more about Molecular clocks, here:

brainly.com/question/286720

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Molecular clocks because the measure changes in DNA or proteins to indicate degrees of relationship among species.Molecular clocks, together with evidence from the fossil record, allows scientists to estimate how long ago various groups of organisms diverged evolutionarily from one another

Which solution would most likely cause a plant placed in it to become firmer and more rigid? A. hypertonic B. hypotonic C. isotonic D. osmotic

Answers

"Hypotonic" is the one solution among the choices given in the question that would most likely cause a plant placed in it to become firmer and more rigid. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has come to your great help.
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