CHEMISTRY MIDDLE SCHOOL

What does unicellular mean

Answers

Answer 1
Answer: consisting of a single cell.
Answer 2
Answer:  characterized by the formation or presence of a single cell or cells. 
Or consisting of a single cell.

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Isotopes called what are used to diagnose disease and to study environmental conditions

Answers

A radioactive tracer, I believe. Someone check that lol.

What is the color would phenolphthalein be if placed in water

Answers

It's would turn pink in a basic solution suck as water.

Mr. Greenjeans wants to know which fertilizer helps grow the biggest pumpkins. He plants three pumpkin seeds of the same variety and then uses three different types of fertilizer on the three seeds. The seeds receive the same amount of fertilizer, water and sunlight. Mr. Greenjeans monitors the pumpkin seeds' growth for three months. How could Mr. Greenjeans improve his experiment?
A) Mr. Greenjeans needs a control group for comparison.
B) Mr. Greenjeans should use corn and radish seeds as a comparison.
C) Mr. Greenjeans should use three different types of pumpkin seeds.
D) Mr. Greenjeans probably should monitor the pumpkins for a longer period of time.

Answers

A)Mr.Greenjeans needs a control group for comparison.
hope this helps

Mr. Greenjeans needs a control group for comparison.


How do we know that the fertilizer had any impact on growth since Mr. Greenjeans has no control group for comparison? He must know how the pumpkins will grow without any fertilizer as well. The control group gives us a way to compare the experimental groups to help form more valid conclusions.

A student wants to increase the maximum amount of sugar that can dissolve in water. She crushes the sugar and then stirs it into the water. Does this work? Explain why or why not.

Answers

Answer:

The amount of sugar that can dissolve in water increase .

Explanation:

  • Energy, which is the capacity to do work or produce heat, affects the rate at which a solute will dissolve.
  • Breaking up, crushing or grinding a sugar cube before adding it to water increases the sugar's surface area.
  • The more surface area a solute has, the faster it will dissolve because more particles of the sugar can interact with the water.
  • This means the finer the sugar particles, the faster it will dissolve.
  • The sugar in the middle of a sugar cube is protected from the water by the sugar in the outer layers of the cube; the water has to go through those outer layers first.
  • But if you crush the cube into a powder, all of the sugar is exposed to the water at once.

How Long can we POSSIBLY Hold our Breaths underwater?

Answers

It really depends on the person, people with bigger lungs can hold their breath longer than those with smaller lungs
i dont understand what you are trying to ask but the world record is 20 minutes but , most people can only hold their breath for two minutes.

What is anything that has mass and volume

Answers

The mass and volume are thephysical properties that define matter. A matter is anything that can be seen or touched and is said to have mass, volume, density, and occupies space.

What is the matter?

A matter is a substance present in the universe that occupies space and is said to have a definite volume and mass. Based on its physical arrangement and composition the matter can be gas, liquid, plasma, or solid.

The mass, volume, and density define the matter and its particles with specific mass and sizes due to the presence of sub-atomic particles like neutron, electron, and proton.

The amount of matter in the universe can be measured in kilograms and grams as mass, and the space occupied by it in cubic meters (m³) as volume.

Therefore, the matter is said to have volume and mass.

Learn more about the matter here:

brainly.com/question/9402776

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Matter is what makes up all of the objects and living organisms in the universe. Anything that has mass takes up space. 
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