CHEMISTRY MIDDLE SCHOOL

Is burning a chemical reaction or a physical change? Tick one box.chemical change                               physical change


And then, explain why you chose your answer.

Answers

Answer 1
Answer: Burning is a chemical change.

In a chemical change, chemical properties change and new products are formed. In burning, coal is obtained, and the chemical properties change of any substance, be it wood, charcoal or anything. Gas is also evolved, which shows that a chemical change has taken place. 

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Which system consists of nerves that initiate communication?
Explain why standard units of measurement are particularly important to scientists.
PLEASE PLEASE HELP WITH THESE QUESTIONS PLEASE!!!!!!!!Is this statement true or false?Living things are classified by the characteristics they have in common.______________________________________________________________________________There are seven major levels of classification. Kingdom and Phylum are just two of the levels. Which of the following are also major levels of classification?Choose all answers that are correct.A.ClassB.OrderC.FamilyD.Level______________________________________________________________________________Which of the following are also major levels of classification?Choose all answers that are correct.A.GenusB.SpeciesC.GroupHELP

A sudden violent flood that occurs within a few hours or even minutes of a storm is called?Answer ASAP plz

Answers

A flash flood.

Hope this helps!
Flash Flood I believe

Which items are minerals or contain minerals? Check all that apply.asap please:)
-lawn fertilizer

-topsoil

-a diamond necklace

-a copper electrical wire

-a cellular phone

Answers

Answer:

Hey dude....

Explanation:

This is ur answer.....

Check all because all of them contain minerals.....

Hope it helps!

Brainliest pls!

Follow me! :)

Answer:

lawn fertilizer, topsoil, and a diamond necklace

Explanation:

lawn fertilizer and topsoil are coming out of the ground, therefore some amount of minerals will be in them, such as iron added to it to make whatever its going on grow stronger.

a diamond necklace is a jewel that is coming out of the ground. it is categorized as a raw mineral.

I'm not 100 percent sure about the copper wire and the cell phone.

I do belive copper is a mineral.

A bacterium is in a nasty environment. What sort of reproduction would it use in this situation? Why? How else would it protect itself? (hint: what were those special capsules called and why were they special?)

Answers

The bacteria in nasty environment undergoes multiple fission.

Explanation:

The bacteria is a unicellular prokaryotic organisms that are found in each and every places of the world. They can survive in extremes of temperatures and pH. They can save themselves through special processes in the extreme climates.

The bacteria undergoes multiple fission in these climates. They cover themselves up with a strong and tough capsule inside which they undergo several Binary fissions. This leads to the formation of multiple cells enclosed with a capsule.

With the return of the favourable climate, the capsule rupture and these newly formed cells come out.

suppose you mix food coloring in water to make it blue. Have you made a solution or suspension. Explain........PLZ HELP

Answers

It would be a solution because it dissolved in the water obviously turning it blue .water dissolves so many solutions that it is often called the "universal solvent".

Some land plants have evolved specialized vascular tissues that have allowed them to thrive on land. The developement of these structures was necessary becauseLand plants need to extract water from the ground and move it to the other structures of the plant.
Land plants need to be tall and the vascular tissues are what provide rigidity to the plant’s cells.
Land plants need to photosynthesize and the vascular tissues is where this process occurs.
Land plants don’t really need these structures as they can absorb water from the air through their leaves.

Answers

Plants are multicellular organisms that have evolved the ability to live on land. ... resemble the earliest land plants (bryophytes) in a variety of ways, including the structure ... These possessspecialized vascular tissues— phloem and xylem —to ... However, they are not restricted to thesehabitats, and some mosses thrive in ...

Calcium carbonates are incorporated into the shells of microscopic marine plants and animals and then participate into the ocean sediments this process is of which of the following A. Sediment deposition
B. evaporate deposition
C. chemical precipitation
D. Biological precipitation

Answers

The answer is: D. Biological precipitation.

Biological precipitation is the deposition of minerals from solution by the agency of organisms.

Deposition is the geological process in which sediments, soil and rocks are added to a landform or land mass.

Ocean sediments originate from numerous sources:

1) biological activity (biogenous).

2) weathering and erosion of the continents (terrigenous/lithogenous).

3) volcanic eruptions (volcanogenous).

4) chemical processes (hydrogenous).

Calcium carbonate (CaCO₃) is made of calcium, carbon and oxygen atoms.
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