A scientist exposed iron fillings to water and air in order to test the ability of iron metal to react. Which is the correct match of the type of change happening and the property being tested during the process? A. Physical change; physical property of reactivity

B. Physical change; physical property of flammability

C. Chemical change; chemical property of reactivity

D. Chemical change; chemical property of flammability

Answers

Answer 1

Answer:

Answer:

C = chemical change, chemical property of reactivity.

Explanation:

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

The reaction of iron with air in the presence of water lead to the production if ion oxide which is called rusting. It is a chemical change.

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg

The reaction of Hydrogen and oxygen:

H 2 (g) + O 2 (g) -------------------------------------> 2H 2O (l)

Physical Change:

The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example

Water converting to Ice

Water converting to gas

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition

Answer 2

Answer:

C) Chemical Change; Chemical Property of reactivity

Explanation:

I took the test

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A scientist finds an unusual living thing and decides to study it. Which observation indicates that the living thing is among the smallest types of living things? A.
It is multicellular.

B.
It does not have a nucleus.

C.
It possesses a membrane-bound nucleus.

D.
It possesses a hard outer shell.

Answers

The smallest living organisms which are capable of survive independently in nature are those which possesses a membrane-bound nucleus. Thus, the correct option is C.

What is a Cell?

A cell is the fundamental unit of life. It is the structural and functional unit of all living organisms. Cells are classified on the basis of its structure, function and origin.

Cells contain a nucleus which contains all the genetic material of an organism The genetic material is stored in the form of nucleic acids such as DNA or RNA. A membrane-bound nucleus is present in all eukaryotic organisms. This membrane helps to separate the nuclear material from the cytoplasm.

The presence of a nucleus is important for all the living organisms as this nucleus contains genetic information which is transferred to the offsprings and hence responsible for reproduction and maintaining the number of organisms.

Therefore, the correct option is C.

Learn more about Cell here:

brainly.com/question/5763151

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Hi There! :)

A scientist finds an unusual living thing and decides to study it. Which observation indicates that the living thing is among the smallest types ofliving things?
A.
It is multicellular.

B.
It does not have a nucleus.

C.
It possesses a membrane-bound nucleus.

D.
It possesses a hard outer shell.

It does not have a nucleus.

10Points please help!!!Which phrase best describes DNA?
A.the structure that sends signals to other parts of the cell
B.the molecule that contains all the instructions for life
C.the molecule that is formed by the action of RNA
D.the structure directly responsible for controlling osmosis

Answers

The answer is A. DNA contains your identity. If a doctor took DNA out of you, it would contain your characteristics.

The phrase that describes DNA is the structure that sends signals to other parts of the cell so A. Hope this helped :)

Which statements accurately describe the roles of decomposers in the carbon cycle? Select three options. Decomposers release carbon dioxide into the air as waste. Decomposers remove carbon dioxide from the air during photosynthesis. Decomposers break down the remains of dead plants and animals. Decomposers return carbon compounds to the soil. Decomposers use carbon to make food molecules.

Answers

Decomposers are existing part of nature. They also have ecologicalroles where they help in the break down of dead and decaying organisms and as well provide some essential nutrients.

The roles of decomposers include:

Decomposers break down the remains of dead plants and animals.

Decomposers return carbon compounds to the soil.

Decomposers release carbon dioxide into the air as waste.

Mainly in the carbon cycle, decomposers perform a major role.
Here, they help in the decomposing dead material from plants and other organisms.
They aid in the release of carbon dioxide into the atmosphere, soil and water as decomposition enables this release.

Learn more from decomposers: brainly.com/question/1090842

Answer:decomposers release carbon dioxide into the air as waste, decomposers break down the remains of dead plants and animals, decomposers return carbon compounds to the soil.

Explanation: i got it right

What does a carbon foot print refer to?

Answers

A carbon footprint is the total emissions of greenhouse gases caused by an individual D

Young tadpoles breathe like fish. What structure enables them to breathe in the water? A. tracheae B. skin C. alveoli D. gills

Answers

Gills help tadpoles breath ...

Young tadpoles breathe underwater with D. gills

Nitrogen gas is more abundant...

Answers

Answer:

Nitrogen like other elements is cycling between air and soil in different forms.

Explanation:

When Nitrogen is in the air, there are some specialized bacteria (Nitrogen fixing bacteria) which are capable of transform gas Nitrogen in "solid" Nitrogen that can be asimilated by plants, these bacteria are asociated with plants and live in symbiosis in their roots. Nitrifying bacteria can also transform the Nitrogen in the air and fix it into the soil and denitrifying bacteria can transform soil Nitrogen ,in atmospheric Nitrogen which is present in the air to keep the Nitrogen cycle.

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What is a antonym for organelle

Which statement describes what happens to elements during radioactive decay?A-They release energy.B-They gain new particles.C-They lose energy at a varying rate.D-They have a consistent number of particles.

PLEASE HELP I'll MARK THE BRAINLIEST1.) A vessel that carries oxygen-rich blood to the heart muscle is called a(n): *A.) Coronary ArteryB.) VeinC.) VentricleD.) Atrium2.) A group of cells that receives messages about the body's oxygen needs and sends out signals to adjust the heart rate is called the: *A.) AtriumB.) Lymph NodeC.) ValveD.) Pacemaker3.) Blood components that helps the body control bleeding are: *A.) HemoglobinB.) Red Blood CellsC.) White Blood CellsD.) Platelets4.) Plasma is mostly composed of: *A.) Blood CellsB.) WaterC.) ProteinsD.) Hemoglobin5.) Which of the following is NOT a characteristic of a vein? *A.) Valves prevent backward flow of bloodB.) Returns blood to the heartC.) Walls are one cell thickD.) Walls are generally thinner than those of arteries6.) The largest artery in the body is called the: *A.) AortaB.) AtriumC.) PacemakerD.) Coronary Artery7.) The network of vessels that returns fluid to the bloodstream is called the: *A.) Lymphatic SystemB.) VeinsC.) ArteriesD.) Circulatory System8.) Hemoglobin is a protein that binds easily to: *A.) White Blood CellsB.) OxygenC.) FibrinD.) Platelets9.) Which of the following structures pumps blood into arteries leading to the lungs? *A.) Right AtriumB.) Left AtriumC.) Right VentricleD.) Left Ventricle10.) Which of the following structures is NOT part of the cardiovascular system? *A.) HeartB.) Blood VesselsC.) BrainD.) Blood11.) True/False: The force of the heart's contracting atria causes blood pressure. *A.) TrueB.) False12.) True/False: Capillary walls must be very thick to withstand the high force of blood pumped by the heart. *A.) TrueB.) False13.) True/False: White blood cells defend the body against disease. *A.) TrueB.) False14.) True/False: Blood travels in two directions in the body. *A.) TrueB.) False15.) True/False: Blood types are determined by proteins known as marker molecules that are on red blood cells. *A.) TrueB.) False16.) Fill in the Blank: The right and left __________________ are the two lower chambers of the heart. *17.) Fill in the Blank: A sphygmomanometer is an instrument that measures ____________________________. *18.) Fill in the Blank: A flap of tissue that prevents blood from flowing backward is a(n) ______________. *19.) List two of the three main roles of the cardiovascular system: *20.) Tell me anything else that you learned in science about the cardiovascular system:

What is the layer of bedrock that is near Earth's surface that forms a continuous shell around Earth called?