Choose all of the examples that show a chemical change.
A) A woodpecker digs in the bark.
B) A dead tree rots on the ground.
C) A forest fire burns a lot of trees.
D) A farmer is cutting logs with an axe.
E) A tree drops rainwater from its leaves.

Answers

Answer 1

Answer:

B and C

Explanation:

Answer 2

Answer:

B) A dead tree rots on the ground.

C) A forest fire burns a lot of trees.

Explanation:

It cannot return the the state it was in before or have the same composition it had before.


Related Questions

Which example accurately describes a solution?

Answers

Typical examples of solutions are

Alcoholic beverage (ethanol in water)Gasoline

What is a solution?

A solution can be defined as a mixture (homogeneous) of two or more substances typically a solute in a solvent, the solvent is usually in greater quantity and the substance or substances present in lesser amounts are the solutes.

Other good examples of a solution

Common examples of solutions are  sugar in water and salt in water solutions, soda water,

Furthermore, solutions can be homogenous or heterogenous

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A 12.17 g sample of a compound contains 7.77 g of iron, Fe, 1.44 g of phosphorus, P, and oxygen, O. Calculate the empirical formula for the compound.

Answers

Answer:

Fe₃PO₄

Explanation:

They have given the total mass of the compound, the mass of iron and the mass of phosphorus. So we can find the mass of oxygen.

Mass of oxygen = 12.17 - (7.77 + 1.44) = 2.96g

So we can now find the empirical formula.

Element - mass - Mr - Mass÷Mr - Ratio - Simplest Ratio

Fe - 7.77g - 55.8 - [7.77÷55.8] - [0.14÷0.05]  - 2.8 = 3

P   - 1.44g -   31   -   [1.44÷31]    - [0.05÷0.05] - 1

O  - 2.96g -   16  -   [2.96÷16]   - [0.19÷0.05]  - 3.8 = 4

[The simplest ratio was obtained by dividing the answer of mass÷mr with the smallest value. Phosphorus had the smallest value of mass÷mr=0.05, so all other answer were divided by 0.05]

Emperical formula = Fe₃PO₄

what happens to glucose in the body?

Answers

After your body has used all the energy it needs, leftover glucose is stored in the liver and muscles. We can store enough fuel for about a day, if you haven't eaten in a while, your blood glucose level drops. :)

Hope this helps!

Write method of manufacturing of oxygen gas from liquid air

Answers

Answer:

cryogenic distillation process

Explanation:

Cryogenic distinction between carbohydrates and harmon process.

Does the amount of mentos affect the height of the pop explosion

Answers

Answer:

no

Explanation:

bcuz science

Answer:

The more mentos you put in a bottle of pop does not necessarily mean a larger explosion. The max amount of mentos with the largest explosion was 4 mentos, it went 350 cm high. With 5 or 6 mentos the explosion went only 330 and 310 cm high.

Hope this helped in some way?

Name one of the elements that has similar properties with helium

Answers

neon and xenon are the elements that has similar properties to helium

Can someone help?

Name the compound:

Answers

CH=benzene

Why?

benzene is represented by the empirical formula CH, which indicates that a typical sample of the compound contains one atom of carbon (C) to one atom of hydrogen (H).

----(Is this what you meant???)

Saliva, produced by glands in the mouth, plays an important role in the digestion of food. Saliva contains a chemical, called amylase, that breaks down starch in the food we eat. A scientist conducts an experiment to investigate at which temperatures amylase works the best. He hypothesizes that the reaction will occur fastest if the amylase reaction is conducted near the normal human body temperature of 37ºC (degrees Celsius). In order to test his hypothesis, the scientist measures the reaction rate, which is how fast the amylase breaks down the starch at six different temperatures. The reaction rate is rated on a scale of 0 to 10, with 0 meaning no reaction and 10 meaning the fastest reaction. The results are recorded in the data table.

AMYLASE REACTION RATE BY TEMPERATURE

Temperature (ºC)

Reaction Rate

0

2

20 4
40 10
60 8
80 2
100 0
Based on the data, should the scientist accept or reject his hypothesis?

Answers

Answer:

The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.

Explanation:

state one cause of temporary hardness of water​

Answers

Answer:

Temporary hardness of water is caused when thermally unstable chemicals like magnesium hydrogen carbonate and calcium hydrogen carbonate are dissolved in water. Temporary hardness is treated by heating the hard water.

Hope that helps. x

How does an introduced species affect an ecosystem? Give 2 examples of positive ways
and 2 examples of negative ways.

Answers

Answer:

1+ it can help create balance among the ecosystem, particularly by controlling invasive species

2+ can help restore native ecosystems on degraded land

1- can become an invasive species

2- can cause an imbalance among native species

Explanation:

How many molecules are present in this formula? 3H2 (SO)4

Answers

Molecules are formed when two or more atoms chemically bond together. In 3H₂(SO)₄, three molecules are present.

What are molecules?

Molecules are the smallest unit present in any compound and are formed by a group of atoms. A number denoted in front of the chemical species is the coefficient that represents the number of molecules.

The coefficient present in front of the reactant or the product in a chemical reaction gives the number of the molecules present in a compound. As three is denoted in front of the sulphuric acid, hence will be the number of the molecules.

Therefore, there are three molecules present in sulphuric acid.

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The reaction below shows how silver chloride can be synthesized. AgNO3 NaCl Right arrow. NaNO3 AgCl How many moles of silver chloride are produced from 15. 0 mol of silver nitrate? 1. 0 mol 15. 0 mol 30. 0 mol 45. 0 mol.

Answers

Answer:

15 mol

Explanation:

the balanced equation is AgNO3 + NaCl > NaNO3 + AgCl.

the stequiometry of the reactions says: one mol of silver nitrate reacts with one one mol of silver chloride to produce one mol of silver nitrate and one mol of sodium chloride.

by proportions, if you have 15 mol of AgNO3 you're gonna have 15 mol of AgCl

From 15 mol of Silver nitrate, the moles of silver chloride produced have been 15 mol. Thus, option B is correct.

The balanced chemical reaction for the synthesis of silver chloride has been:

[tex]\rm AgNO_3\;+\;NaCl\;\rightarrow\;AgCl\;+\;NaNO_3[/tex]

From the balanced equation, since there has presence equal moles of silver nitrate and sodium chloride, the moles of silver chloride formed has been equivalent. Thus, 1 mole of silver nitrate gives 1 mole of silver chloride.

The moles of silver nitrate available are,  [tex]\rm M_A_g_N_O_3=15\;mol[/tex]

The moles of silver nitrate produced can be given as:

[tex]\rm 1\;mol\;AgNO_3=1\;mol\;AgCl\\15\;mol\;AgNO_3=15\;\times\;1\;mol\;AgCl\\15\;mol\;AgNO_3=15\;mol\;AgCl[/tex]

Thus, the moles of silver chloride produced have been 15 mol. Thus, option B is correct.

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Which tool would give the most precise measurement of 15 milliliters of water

Answers

A graduated cylinder

_________________

o0o0o0o0o0o0o0o0o0

What is an active metal?
A. a metal that reacts with oxygen
B. a metal that is above hydrogen in the activity series
C. a transition metal
D. a metal with only one valence electron

Answers

Answer:

A metal is said to be an active metal when it reacts strongly and quickly with other elements due to the electrons in its structure and its ease of sharing the electrons with other elements. ... A metal's reactivity increases as we go from the top to the bottom of the periodic table.

Explanation:

PLEASEEE HELPPPPPPPPPPPPPPPPPP

Answers

It’s 160.325 grams of mol sulfur! Hope this helped :)

Which type of reaction is
NaOH + KNO3 NaNO3 + KOH
-->>

Answers

Answer:

Explanation:

NaOH + KNO3 --> NaNO3 + KOH. combustion. CH4 + 2 O2 --> CO2 + 2 H2O. single displacement. 2 Fe + 6 NaBr --> 2 FeBr3 + 6 Na. double displacement.

23.
What would happen to the substance in the jar if energy was added?

Answers

Answer:

it would explode

Explanation:

dont put that as an answer i need point for finals

I hope you can see because I really need help! I’ll give you 5 stars!

Answers

Answer:

In the picture A kettle is boiling water and evaporating it we can see the water vapours coming out of the kettle and there is a paper on top of the kettle from where the water vapours are coming out .

Explanation:

is this right ?? i hope it helps

answer this bs for me pls

Answers

Answer:

B.chlorine ,Cl2 is the one

which of the following types of radiation can be blocked with only a sheet of paper?

beta decay, gamma decay, they are equally dangerous, alpha decay

Answers

Answer:

Alpha decay

Explanation:

Alpha decay can be blocked with only a sheet of paper.

Extra info : -

In general, alpha particles have a very limited ability to penetrate other materials. In other words, these particles of ionizing radiation can be blocked by a sheet of paper, skin, or even a few inches of air.

Hello there!

Alpha decay can be blocked with only a sheet of paper.Gamma rays can only be blocked with something thick and dense.Beta rays can be blocked with something less dense, but thicker than paper.

Hope this helps. Let me know if you have any questions.

~GracefulGirlie :)

Good luck on your assignment.

has an atomic number of 1.

Answers

There are many with atomic number 1

hydrogen , helium , lithium , beryllium etc.

Hope this answer helps you dear!.

Answer:

With atomic number 1 is hydrogen

Explanation:

The valence with 1 is hydrogen, lithium.....

what is the relationship between electron affinity and atomic radius? why do you think this relationship occurs?

Answers

Electron affinity increases from left to right within a period. This is caused by the decrease in atomic radius. Electron affinity decreases from top to bottom within a group. This is caused by the increase in atomic radius.

Pls
Due today pls help asfast as possible

Answers

Answer: D. 10,000 km = Exosphere; 690 km = Thermosphere; 85 km Mesosphere; 50 km = Stratosphere; 20 km = Troposphere

2. True

3. True

4. True

5. True

how do particles in the most rigid state of matter move

Answers

Explanation: In solids, particles are very closely packed in an orderly arrangement in a lattice and only vibrate in fixed positions. The forces of attraction between them are very strong. This allows them to overcome the forces of attraction that hold the other phases closer together

Which force holds protons and neutrons together in the nucleus of an atom?

Answers

Answer:

D

Explanation:

Select from the unit conversion factor options below to determine the mass in grams of 1.204 × 1024 atoms of carbon.
1 mol C/ 6.02 x 1023 atoms C, 6.02 x 1023 atoms C / 1 mol C
12 g C / 1 mol, 1 mol / 12 g C



a
12040 g
b
24 g
c
204 g
d
1.99 g

Answers

Answer:

option a is the answer

Explanation:

bye bye

13. A natural flow of groundwater that has
reached the surface is a(n)
a. spring.
c. aquifer.
b. well.
d. travertine.

Answers

A natural flow of ground water that has reached surface level is call a spring.

Water moves underground downward and sideways, in great quantities, due to gravity and pressure.

A spring is the result of an aquifer being filled to the point that the water overflows onto the land surface. They come in different sizes, from intermittent seeps, which flow only after much rain, to huge pools flowing hundreds of millions of gallons daily.

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Fill in the blanks:
87 pg = [? ]x10^[?]g

Answers

87 picograms are equivalent to [tex]8.7\times 10^{-11}[/tex] grams.

This is a unit problem, in which a derived unit must translated into a fundamental unit. A picogram is a equivalent to a trillionth of a gram, which is the fundamental SI mass unit. Mathematically speaking, we have the following equivalence:

[tex]1\,pg = 1\times 10^{-12}\,g[/tex]

Now we proceed to find the equivalent value for this case:

[tex]87\,pg[/tex]

[tex]87\times 10^{-12}\,g[/tex]

[tex]8.7\times 10^{-11}\,g[/tex]

87 picograms are equivalent to [tex]8.7\times 10^{-11}[/tex] grams.

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explain why nitrogen diffuses faster than clorine

Answers

due to the fact nitrogen diffuses faster than chlorine nitrogen has insures called co2 which implodes the chlorine which leads to nitrogen having a faster diffusion

giving brainliest, more chemistry questions being uploaded

Answers

Answer:

We have the atoms, and we have the molar mass of Vanadium (listed in the periodic table) which should be 50.94g/mol.

The first step is to convert the 4.18 x 10^23 atoms into moles by dividing the atoms by Avogadro's number (6.02 x 10^23)  

(4.18 x 10^23)/(6.02 x 10^23) = 0.694 moles

Now we know that moles is equal to the mass divided by the molar mass. So now that we have the moles and the molar mass of Vanadium, we can rearrange the equation to find mass. Once you have rearranged it, you have to multiply the moles by the molar mass.

So 0.694 moles x 50.94g/mol = 35.35g of V

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