What are some examples of a chemical change? (list more than 2 examples)

Answers

Answer 1

Cooking any food.

Burning of wood.

Digestion of food.

Acid-base reaction.

Answer 2
Chemical batteries, Digestion, Photosynthesis, Cooking food

Related Questions

I will give thanks, profile thanks, brainliest and 5 star

Answers

Answer: E.) C2N2H8

Explanation:

Answer:

E ) C2N2H8

Explanation:

A) Oxygen
B) water and oxygen
C) water and carbon dioxide
D) water and carbon monoxide

Answers

Answer:

A

Explanation:

this is because combustion is the chemical reaction between surfaces including OXYGEN to generate heat and light in the form of flame

which option can be classified as a pure substance

A. solution
B. compound
C. homogeneous mixture
D. heterogeneous mixture

Answers

Answer:

B. compound

Explanation:

A pure substance can be an element, which consists of only one type of atom and cannot be broken down by a chemical change, or a compound, which consists of two or more types of atoms.

An ion is:

Select one:

a.
An atom with an extra neutron.

b.
An atom or molecule with an electrical charge.

c.
The outermost shell of an atom.

Answers

The answer is b) an atom with an extra neutron.


The outermost shell of an atom is known as a valence shell.

An atom with an extra neutron is an isotope.

how does one determine a molecular formula from the epirical formula

Answers

Answer:

C

Explanation:

HELP ME PLEASE HURRY
The characteristics of two different types of reactions are shown below:

Reaction A: Electrons are gained by the atoms of an element.
Reaction B: Protons are lost by the atom of an element.

Which statement is true about the atoms of the elements that participate in the two reactions?

Their identity changes in both Reaction A and Reaction B.
Their identity changes in Reaction A but not in Reaction B.
Their identity changes in Reaction B but not in Reaction A.
Their identity remains the same in both Reaction A and Reaction B.

Answers

Answer:

D is correct

Explanation:

Answer:

A

Explanation:

Electrons are gained by the atoms. There is no change in the nucleus of the atom and the number of protons remains identical.

question: the diagram below shows the major parts of the digestive system.
what part of the digestive system is labeled by the number 1?
A.
small intestine
B.
esophagus
C.
stomach
D.
mouth

Answers

D . mouth bc the esophagus is like the throat

Answer:

I got it Right in Study Island

Explanation:

Use the chemical equation to complete the activity.

4Fe + 3O2 → 2Fe2O3

Iron (Fe) reacts with oxygen (O2) to form iron oxide. A scientist adds 15.4 grams of Fe to 3.6 grams of O2 to start the reaction. All of the iron and oxygen react to form iron oxide. Explain in detail how you can determine how many grams of iron oxide will be produced.

Use the law of conservation of matter in the explanation.

Answers

Answer:

14.54 g Fe2O3

Explanation:

The first step would be to balance the equation but since it's already balanced we don't have to worry about that.

Through the balanced equation, you can find the stoichiometry of the reaction, that is:

4 moles of Fe, react with 3 moles of O2, to produce 2 moles of Fe2O3

Chemistry (accurately stoichiometry) is all about ratios and proportions. The balanced equations gives you the standard ratio by which moles are produced.

So the next step (shown in the paper), is to convert the grams that are giving you in Moles, and you do this by dividing the number of grams given by the molar mass of the substance. The molar mass is the number of grams by which you can find exactly 6.022x10²³ molecules (one mole) of one specific substance.

15.4 g of Fe= 0.28 mol Fe

3.6 g of O2= 0.11 mol O2

Now that you have the quantity of moles, what you need to do is to look for the limitant reactant.

In a balanced equation, the number of moles in the reactants are the rules and they're gonna react completely with each other. If you want x quatity of reactants to react completely, then you will have to respect the proportion to the ratio given in the balanced equation.

But you will rarely follow the proportion so there will usually be a reactant that's gonna be limiting the reaction and one that is in excess. And how do you find this? Well, the easiest way to do it is:

Dividing the number of moles obtained by x element the coefficients of that element in the balanced equation. The one that has the smallest ratio, is the limitant reactants.

Since the limitant reactant is gonna be limiting the reaction, all the stoichiometric procedures should be calculated through it, and in this case, the limitant reactant is O2.

But then how to establish the stoichiometric rule to find the number of Iron oxide (III) that's being produced?

Look back to the stoichiometry of the reaction:

To produce 2 moles of Fe2O3, you need 3 moles of O2.

But you have 0.11 mol O2.

Then establish a factor of conversion (shown in the picture)

The result is 0.07 mol of Fe2O3, but you need the answer in grams so you find the molar mass of Fe2O3 and then multiply it by the number of moles (0.07)

The answer is 14.54 g of Fe2O3

CHEMISTRY IS ALL ABOUT PROPORTIONS :D

Liquids have a definite volume when poured into a container. What does this mean?

Answers

Answer:

A solid has definite volume and definite shape, a gas has neither definite volume nor definite shape, and as said in the question, a liquid has a definite volume but no definite shape.

What this means is that even though liquid molecules can slide past each other and move to fill up the space they are in (this means that liquids have no definite shape), they keep their volume. That is, liquids have consistent, unchanging volume.

Hopefully that's helpful! :)

Elements in a vertical column on the Periodic Table have similar properties and are all members of the same
of elements.
ME
A
molecule
HD
B
phase
С
atom
D
group

Answers

Answer:

Explanation:

I think it's D but I could be wrong

Answer:

D

Explanation:

good and bad effects of changes in materials in the environment​

Answers

Answer:

Composting, recycling, technological development, water cycle and photosynthesis are changes that have good effects. Some changes have bad effect like pollution and destruction of habitat and lose of lives.

Explanation:

hope it helps

How many grams of iron are in 350 mg of iron? *
O A. 3.50 g
O B.0.350 g
O C.35.09

Answers

Answer:

It s B because 350 mg= 35.0cg=3.50dg=0.350

Answer:

its 0.350 letter B

Explanation:

im pretty sure you divide the mass value by 1000 to get you answer.

what do you think will happen to the kidneys if any of these parts were damaged?

Answers

Answer:

When your kidneys are damage waste products and fluid can build up in your body. That can cause swelling in your ankles nausea weakness poor sleep and shortness of breath. so without treatement the damage can get worse and your kidney may eventually stop working.

The bowl of fruit has a mass of 2.2 kg.
What net force must act on the bowl of fruit to make it accelerate to the right
at a rate of 4.4 m/s2? (Hint: Use F = ma.)
A. F = 9.68 N right
B. F = 9.68 N left
C. F = 6.60 N left
D. F= 6.60 N right

Answers

Taking into account the Newton's second law, the correct answer is option A. F = 9.68 N right

In first place, acceleration in a body occurs when a force acts on a body.

Newton's second law states that a force will change the speed of an object because the speed and/or direction will change. These changes in velocity are called acceleration.

So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object

Mathematically, Newton's second law is expressed as:

F= m×a

where:

F = Force [N] m = Mass [kg] a = Acceleration [m/s²]

In this case, you know:

F= ? m= 2.2 kg a= 4.4 m/s²

Replacing in Newton's second law:

F= 2.2 kg× 4.4 m/s²

Solving:

F= 9.68 N

Finally, As the bowl of fruit accelerates to the right, the correct answer is option A. F = 9.68 N right

Learn more about the Newton's second law:

brainly.com/question/23845187?referrer=searchResults

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An endothermic reaction occurs when water and ammonium nitrate are combined. Which of the following statements correctly
describes the energy changes in the reaction?
OA. Energy is released because the reactants have more chemical energy than the products.
OB. Energy is absorbed because the reactants have more chemical energy than the products,
OC. Energy is absorbed because the products have more chemical energy than the reactants.
OD. Energy is released because the products have more chemical energy than the reactants.

Answers

Answer:

C.Energy is absorbed because the products have more chemical energy than the reactants.

Explanation:

How many atoms are in 11.5g of Hg

Answers

5. is your answer thank you!

What was boyle’s most famous discovery about gases?

Answers

Answer:

Boyle's most famous discovery had to do with how the pressure and volume of gases relate, either this or he discovered the volume of a gas decreases with increasing pressure...

Explanation:

...

Would an alkaline earth metal make a good replacement for tin in a tin can?

Answers

Answer:

Definitely not. This is because the alkaline earth metal [basically group 2 elements] are reactive and will react with the contents of the can, contaminating it.

No, alkaline earth metals would not be a good replacement for tin in a tin can because alkali from alkaline earth metals react with tin and release hydrogen.

What are alkaline earth metals?

Alkaline earth metals are present in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

They are called alkaline earth metals because their hydroxide and oxides are highly alkaline. Their metal oxides are found in the earth's crust.

These metals have 2 electrons in their outer shell, and they are highly reactive, so they will react with the tin in a tin can.

Thus, alkali from alkaline earth metals react with tin and generate hydrogen, hence they would not make an acceptable replacement for tin in a tin can.

To learn more about alkaline earth metal, refer to the below link:

https://brainly.com/question/23436350

#SPJ2

what is the difference between hydrophilic and hydrophobic?

Answers

Hydrophilic - attracted to water
Hydrophobic - resists water

What is the correct formula
for tin(II) chloride dihydrate?

Answers

the answer is A. SnCl2 . 2H2O

A sample of nitrogen gas at STP has a volume of 65.8 L. What is the mass of the gas?
A)
82.3 g
B) 41.18
2.94 g
07
0.210 g
E
0.1058

Answers

Answer:

B

Explanation:

Consider the van deemter equation. why does increasing the flow rate reduce the contribution of longitudinal diffusion to total plate height?

Answers

Answer:

Why does increasing the flow rate reduce the contribution of longitudinal diffusion to total plate height? Increasing the flow rate decreases the time the solute resides in the column, resulting in less diffusional broadening.

Explanation:

What would be the partial pressure of nitrogen, PN2, in a room in which the total air pressure was 0.987 atm?

Answers

This problem is providing describing a room in which air has a total pressure of 0.987 atm and the partial pressure of nitrogen is asked, turning out to be 0.746 atm.

In such a case, we can start by looking at the provided table, which shows the composition of dry air in mass basis, which means we must convert the composition of nitrogen to mole fraction by knowing that the average molar mass of air is 28.9647 g/mol, and thus, we infer that the mole fraction of nitrogen in air is about 0.755 according to:

[tex]x_{N_2}=\frac{0.781*14.0067g/mol*2}{28.9647g/mol} =0.755[/tex]

Then, we recall the Dalton's law version that relates total pressure, partial pressure and mole fraction written for nitrogen:

[tex]P_{N_2}=x_{N_2}P[/tex]

Finally, we plug in the previously calculated mole fraction and the total pressure of air to obtain:

[tex]P_{N_2}=0.755*0.987 atm\\\\P_{N_2}=0.746atm[/tex]

Learn more:

(Gas laws) https://brainly.com/question/8511562(Dalton's law) https://brainly.com/question/14119417

Select the correct answer. In which situation is chemical energy being converted to another form of energy? A. a lamp plugged into the electric grid B. a fluttering flag C. a floating wooden log D. a burning candle

Answers

Answer:

D. A burning candle. (chemical energy into energy of heat and light, i.e. thermal and wave)

Explanation:

comment and tell me if it right.

The situation in which chemical energy being converted to another form of energy is a burning candle.

So, option D is correct one.

What is chemical energy?

The energy produce by the chemical reaction is called chemical energy.

Example: burning of candle.

Give the example of energy conversion.When lamp plugged into electric grid then electrical energy is converted into light energy.When candle is burn then chemical energy is converted into light energy.No energy takes place during a fluttering flag and a floating wooden log.

learn more about chemical energy,

https://brainly.com/question/1371184

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which reaction is an oxidation-reduction reaction?

Answers

Answer:

pl

saponification palmitate

Please I need helppppp

Answers

Answer:

[tex]FeCl_{2} +H_{2} S->FeS + 2HCl[/tex]

Explanation:

I am assuming that we have to balance this equation. On the left side, we have one Fe, 2 H, 2 Cl, and 1 S. On the right side, we have 1 Fe, 1 H, 1 Cl, and 1 S. Adding a 2 as a coefficient in front of the HCl on the right side will make 2 H and 2 Cl instead, balancing the overall equation.

FeCl_{2} +H_{2} S- > FeS + 2HClFeCl 2 +H 2 S−>FeS+2HCl

Which of these statements are true? Select all that apply. The Delta. Hf for Br2(I) is 0 kJ/mol. The Delta. Hf for He(I) is 0 kJ/mol. The Delta. Hf for Hg(I) is 0 kJ/mol. The Delta. Hf for Cl2(g) is 0 kJ/mol. The Delta. Hf for N2(I) is 0 kJ/mol.

Answers

The enthalpy of formation of liquid mercury and gaseous chlorine are zero because the substance are in their standard state.

The standard state of a substance is the form in which it is found under standard conditions. This include a pressure of 1 atm, a temperature of 298 K and a a concentration of 1 M.

The enthalpy of formation of a substance in its standard state is 0 KJ/mol. The following substances has ΔHf of 0 kJ/mol.

ΔHf of  Hg(I) is 0 kJ/mol. ΔHf of Cl2(g) is 0 kJ/mol

Learn more: https://brainly.com/question/13164491

Help me Please

Is boiling an egg a physical or a chemical change? Explain your answer.

Answers

Answer:

it's a chemistry change

Explanation:

this is because heat is causing permanent changes and can no longer be changed back to its original atate

what do solid and gas-particle have in common? (not liquid )

Answers

Answer:

Solid, liquid, and gas are common states of matter. Because each particle is attached to several others, individual particles cannot move from one location to another, and the solid is rigid. A has a fixed volume but does not have a fixed shape. Liquids take on the shape of the container they are in.

Explanation:

sorry, this is what i think

How long is a bench? Select the best estimate.
4 centimeters
4 milllimeters
4 kilometers
4 meters

Answers

Answer:

4 meters

Explanation:

4 centimeters and millimeters are too small, while 4 kilometers is too large.

Other Questions
2/5% as a fractionPld For this project, you will have several choices! Choose ONE (1) of these three options:Option 1:You may choose to write a traditional 5-paragraph compare-and-contrast essay about the two Mark Twain texts. If you do this, you should follow these guidelines:Paragraph 1This should be an introduction of the two texts, ending with a thesis statement that explains how the three literary elements you will focus show that the texts are more similar or more different.Paragraphs 2, 3, and 4Each of these body paragraphs should focus on one of the terms from your prewriting activity. You should explain the evidence of that term in each text, and how this shows their similarities or their differences.Paragraph 5This concluding paragraph should summarize what you have presented in your body paragraphs and contain a final sentence that rephrases your thesis.Option 2:You may choose to do a slideshow presentation about the two texts. If you do this, you should follow these guidelines:You should have a minimum of 8 slides (not counting a title slide for your presentation).Slide 1This should be a paragraph introduction of the 2 texts, including a thesis statement that states whether these texts have more similarities or more differences.Slides 2-7These slides should be in the "Title and 2 columns" format. The title of the slide should be one of the literary terms, and in each box you should explain how that term is represented in each text (your prewriting notes will be very helpful here!)Slide 8This should be a few concluding sentences, and you should state which of the terms you covered in the previous slides best prove that the two texts are more alike or more different.Option 3:You may choose to create a video (remember the Forest Service official who was contrasting the two volcanoes?) in which you follow these guidelines:Begin by giving the viewer an explanation of what these two texts are.State definitely whether you will be talking about how similar or how different these two texts are.Using a minimum of three of the literary terms as your criteria, explain how each one relates to the text. These explanations should prove the statement you made (whether the two texts have more similarities or more differences).Conclude your video with a final statement about the two texts.See the rubric attached to the assignmentmake sure you keep referring to this as you complete your work so that you will get all of the points possible. solve the system of equations please help If a shirt for RS 18 is marked up to RS 20 then the percentage increase is equal to Which of the following are functions of an animal's movement structures like wings, legs, or fins? Select the two correctanswers. (1 point)identifying foodkeeping out bacteria and virusesmigrating to mating spotso escaping from predatorsprotection from elements Seven less than one-fourth of a number is 2. What is the number? suppose you want to change your school and join another one which is very expensive.make a list of the possible risks while joining another school. Help me I need it plz Which condition in the figure below willprove l || m? Determine whether it is possible to form a trianglewith side lengths 5, 7, and 8.O yesno Near is to remote as similar is to A) same B) farC) different D) value A line passes through the point (-4, 7) and has a slope of -5/4Write an equation in slope-intercept form for this line. How i can usea the distribute property on this equation? Someone help me out pls what is the meaning of hindi word yesterday (was /were) a busy day for us Pls help me guys .................. The body mass index, I, can be used to determine an individual's risk for heart disease. An index less than 25 indicates a low risk. The body mass index is given by700Wthe formula, or model, I=where W= weight, in pounds, and H = height, in inches. Jerome is 70 inches tall. What weights will keep his body mass indexH2between 20 and 28? Compare the values.9 x 10^2 is?times as much as 3 x 10^-2. HHEELLPPPP PPLLEEAASSEEEHow did the Roman Catholic Church respond to the spread of Protestantism?It sent armies to attack German states.It increased the power and reach of the Inquisition.It agreed to print the Bible in German and English.It did away with most of the Catholic rituals.