CHEMISTRY MIDDLE SCHOOL

Explain why burning is a chemical change in wood

Answers

Answer 1
Answer: The carbon element in wood reacts to the oxygen so it creates, energy as we all know as light and heat, ashes, and smoke. Hope this helps!
Answer 2
Answer: It is a chemical change in wood because a chemical change is when some object is being changed. So when fire burns on wood it changes how the wood is. The wood goes from whole to ash dust. Hope I could help. ;-)

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What is my skeletal system made of

Answers

your skeletal system consists of all the 206 bones and the 360 joints in the human body. This includes the cells, protein fibers and minerals that make up your bones.

Is popping popcorn a physical or chemical change? Explain your answers.

Answers

it would be a physical change because if you were to pop popcorn the popcorn would go from a kernel to a popcorn peice therfore the physical state is alterered/changed\.

I need help please on these questions, i can not do the model, so please help me, if you could give me an example that would be great 1. Which of the stages of the water cycle were you able to observe in your model?

2. What is the energy source in your model and what does it represent?

3. Did you observe evapotranspiration in your model? If yes, where? If no, how
could you have demonstrated it?

4. Where in your model does condensation occur more rapidly? How do you know?

5. Do you think your model accurately demonstrates the water cycle? Why or why
not? If you were to redesign your model, how would you refine it?
5 point for each.

Answers

1. What were you able to observe
2. What runs the whole thing
3. Not to sure...maybe someone will have a better answer for you sorry!
4. Where does a vapor or gas turn into a liquid 
5. Do you think that the model you did demonstrates a water cycle? And if you were to redo it, how would you redo it and demonstrate it!

Lithium, sodium, and potassium are examples of

Answers

Answer:

The correct answer is: Alkali Metals

Explanation:

The chemical elements that belong to the group 1 of the periodic table are known as the alkali metals. The alkali metals belong to the s-block and are highly reactive in nature.

The alkali metals are lithium (chemical symbol Li), sodium (chemical symbol Na), potassium (chemical symbol K), rubidium (chemical symbol Rb), caesium (chemical symbol Cs), and francium (chemical symbol Fr).

Therefore, lithium, sodium, potassium are examples of alkali metals.
Metals in the periodic table.

Please help!! I’ll mark u brainly What type of reaction occurs during photosynthesis?
O
A. Oxidation-reduction
O
B. Decomposition
O
C. Combustion
O
D. Double-displacement

Answers

Answer:

Oxidation Reduction

Explanation:

The electrons in the water are oxidized or reduced and the CO2 levels are reduced or gaining electrons.

Answer:

Oxidation-reduction

How many grams of N2 can be produced when 6.50 g of O2
reacts?

Answers

Answer:

3.79 g of N2.

Explanation:

We'll begin by writing the balanced equation for the reaction.

This is given below:

4NH3 + 3O2 → 2N2 + 6H2O

Next, we shall determine the mass of O2 that reacted and the mass of N2 produced from the balanced equation.

This is illustrated below:

Molar mass of O2 = 16x2 = 32 g/mol

Mass of O2 from the balanced equation = 3 x 32 = 96 g

Molar mass of N2 = 2x14 = 28 g/mol

Mass of N2 from the balanced equation = 2 x 28 = 56 g

Summary:

From the balanced equation above,

96 g of O2 reacted to produce 56 g of N2.

Finally, we shall determine the mass of N2 produced by reacting 6.50 g of O2.

This can be obtained as follow:

From the balanced equation above,

96 g of O2 reacted to produce 56 g of N2.

Therefore, 6.50 g of O2 will react to produce = (6.50 x 56)/96 = 3.79 g of N2.

Therefore, 3.79 g of N2 were obtained from the reaction..
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