which of the following is a chemical change?
a. boiling of water
b. melting a cube of ice
c. mixing water and oil
d. splitting water into hydrogen and oxygen

Answers

Answer 1

Answer:

D. Splitting water into hydrogen and oxygen.

Explanation:


Related Questions


in a democracy,______ helps in formulating opinions and taking decisions​

Answers

Answer:

citizens

Explanation:

Answer:

the answer is citizens

Research an invention in America from the 1800's. Post your invention and a picture on the discussion board. Be sure to include who was the inventor, when it was invented, how it was used and if it is still used today.

Answers

Answer:

Elias Howe Jr. was an American inventor best known for his creation of the modern lockstitch sewing machine. This invetion  was in 1846. The very first lockstitch sewing machine in the world.  His invention helped the mass production of sewing machines and clothing. That in turn revolutionized the sewing industry and freed women from some of the drudgery of daily life at the time. Contrary to popular belief, Howe was not the first to conceive of the idea of a sewing machine. Many other people formulated the idea of such a machine before him, one as early as 1790, and some had even patented their designs and produced working machines, in one case, at least 80 of them.

It was Howe, however, who came up with significant refinements to the design concepts of his predecessors, and on September 10, 1846, he was awarded the first U.S. Patent (4,750) for a sewing machine using a lockstitch design. His machine contained the three essential features common in most modern machines: a needle with the eye at the point; a shuttle operating beneath the cloth to form the lock stitch; and an automatic feed.

Howe's design demonstrated the novel idea of a needle that carried the thread forward, through a piece of material, where another thread, held in a metal shuttle, passed through a loop in the middle thread (caused by the needle moving forward then suddenly backward). The needle was then retracted and this action pulled the two threads to lock them in the fabric. This is how the lockstitch was born.

The sewing machine is easier to use and also you can repair worn, torn or unused clothes by yourself. You can re-design your old clothing. You can even become a fashion trend-setter by making clothes in your own style. Having a sewing machine will save you from going to a tailor, thus helping you to save money.

hope this helps!! :)

I need the answer for this?

Answers

Answer: i believe the answer to 11. is 1400 ce. and 12. is a :)

Explanation:

Food Webs Observation Stations: Station 1
Name:
1. Which organism shown in the food web transfers the most energy within the food web?
Explain your answer.
2. What role in an ecosystem is missing from this food web? Explain your answer.

Answers

Answer: 1. Plants

2. Physical factors (sunlight)

Explanation:

1. The plants are the main source of energy for the ecosystem. They exhibit the major amount of energy as they can produce their own food by the process of photosynthesis. Hence, they are called producers. They are consumed by the consumers like rabbits, inchworms, and robins. The producers are at the lowest trophic level in an energy pyramid.  The trophic levels above producers the energy reduces considerably and only 10% energy is utilized in each trophic level.

2. The ecosystem is a biotic community where living beings interact with the non-living components of the environment. Non-living components are water, sunlight, air and others. In this food web the non-living components are absent. The sunlight is the essential non-living component of the ecosystem. It is necessary for photosynthesis, in this the plants use carbon dioxide and water from the environment in the presence of sunlight to produce their food in the form of carbohydrates. So,  the supporting role in terms of non-living components is absent in this ecosystem.    

1. The Plants is the organism which is shown in the food web that transfers the most energy within the food web.

The plants are the main source of energy for the ecosystem because they exhibit the major amount of energy as they can produce their own food by the process of photosynthesis.

Plants are consumed by the consumers like rabbits, inchworms, and robins

2.  The supporting role (the Biotic) in terms of non-living components is absent in this ecosystem.

The Non-living components includes water, sunlight, air and others.

In this food web, the non-living components are absent.

Read more about Ecosystem

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After the Civil War ended, African American men in Georgia were still prevented from voting because of the

Answers

Answer:

of the black codes

ExplanatioAfter the Civil War ended, African American men in Georgia were still prevented from voting because of the: black codes in Georgia's constitution. ... Congress later gave the US military control over Southern state governments to: enforce the Fourteenth Amendment.n:

Answer:

It’s d

Explanation:

Just did this so you can give brainliest to dat person. Nd I took the unit test and quiz soo yea...

Which describes an interaction in which organisms work so that all organisms in the group benefit

Answers

Answer:

Both organisms benefit in mutualism, but only one in parasitism and commensalism. Both organisms benefit in mutualism, but only one in parasitism and commensalism.

Answer:

A :cooperation

hope it helps :)

Can a tornado actually pick up a house and move it somewhere else?

Answers

it’s possible but most likely it will drop and be damaged in the same place most tornadoes pick up lighter objects. it can happen but not common only if extreme


hope this helps

HELP NEEDED Look at the picture oh yeah someone gets 15 points

Answers

Answer:

C

Explanation:

Which feature would be most characteristic of socialist economic systems in many European nations?​

Answers

Answer:

Government-managed healthcare

Explanation:

Under socialist system, all resources that exist in the country technically belonged to the "people". But they still need to form a government that take control over the resources  and the people do not necessarily have the power to use those resources however they want.

Under this system, the government tend to control the resources/programs that's considered as basic necessities by the people (such as education, healthcare, food stamps for the poor, shelters, energy, etc)

5. What would entice a group of people like the Vikings to want to invade the island of Britain?​

Answers

Answer:

Vikings raided for economic rather than political or territorial gains, and so were eager to enrich themselves through ransom money and slave trading. While naval Viking battles were not as common as battles on land, they did occur.

hope this helps!:)

Explanation:

An entice group of people like the Vikings would want to invade the island of Britain because of the acquisition of wealth. "Britain was particularly well known for its lucrative trade centres, and the Scandinavians were aware of this through their own commerce with the region. Also, during the mid-9th century, Vikings seized the Codex Aureus and held it for ransom."

Choose the THREE countries that are found in the Middle East/Southwest Asia, A) Iraq B) Libya C) Syria D) Greece E) Saudi Arabia​

Answers

Answer:

Iraq, Saudi Arabia and Syria

Explanation:

Libya is in Africa Greece is in Europe

The three countries that are found in the Middle East/Southwest Iraq  Syria  Saudi Arabia​.

What is the  Middle East?

Arabia, Asia Minor, East Thrace, Egypt, Iran, the Levant, Mesopotamia, and the Socotra Archipelago are all considered to be parts of the Middle East. Beginning in the early 20th century, the phrase began to replace the phrase "Near East" in everyday speech.

They have a similar percentage of ancestry with populations in the Caucasus and the Middle East that reside in the Middle East and the surrounding region. 33.2% of Turks have ancestry that is a mix of East European and West Asian people.

The British India Office may have been where the phrase "Middle East" first appeared in the 1850s. However, it gained further popularity after being used by American naval strategist Alfred Thayer Mahan to "designate the territory between Arabia and India" in 1902.

Therefore, Thus, option (A B E ) is correct.

Learn more about the  Middle East here:

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The salary for a pharmacy technician varies based on location,
education, experience, size of facility, and many other factors.
O True
O False

Answers

Answer:

true

hope this helps!!:)

Explanation:

1) The GDP per capita of Algeria is approximately.

Answers

Answer:

3,898.01 USD

Explanation:

GDP per capita is a measurement that is used to find out the average economic that a person contributed in a country within one year period. This can be seen as an indicator of wealth and living condition in the country.

The amount of GDP / capita was really low, which most likely means that vast majority of people in Algeria lived in poverty and have low living standard.

For comparison The GDP per capita in United States is around 65,297.52 USD. On average,  a US citizen produced almost 20 times economic output compared to an Algerian citizen.

Which political party most likely approved of this cartoon depicting Jackson as a statue atop a pig?


a) the Whig Party
b) the American Party
c) the Democratic Party
d) the Democrat-Republican Party
e) the National Republican Party

Answers

Answer:

e) the National Republican Party

Explanation:

You wouldn't think the supporters of Andrew Jackson would approve of him him riding on a pig. Also, if you look closely at the cartoon, you can see the words bribery, fraud, and plunder, and there are even skeleton heads on the ground next to him. Once again, Jackson's supporters (the Democrat-Republican Party) would not approve of this on his statue, so the political party that most likely approved of this cartoon, is the National Republican Party.

Hope this helps! If you have any additional questions please don't hesitate to ask me or your teacher to be sure you master the subject. Stay safe, and please mark brainliest!

Answer:

The national republic party

Explanation:

Took the quiz

After FDR, every President gets a "report card" on how well he/she is
implementing his/her policies, after the first days.
A. 100
B. 365
C. 210

Answers

Answer:

I believe B, but im not 100% sure

Explanation:

How do some people feel the U.S. can promote democracy in Cuba?

Answers

Answer:

Through bilateral relationship.

Explanation:

Bilateral relationship is a form of diplomatic relations in which two countries can form a cooperative effort to achieve a mutually beneficial goals. Such as engaging in a mutually beneficial trades, being an ally in conflict resolutions with another country , etc.

If we form such bilateral relationships, there will be a huge chance that the people in Cuba can observe the positive effect of Democracy in United States and become more likely to change their perspective. Rather than wars/conflict that often lead to hatred, this would be a more efficient method for United States to promote democracy in Cuba.

under bill clinton,how did democrats change their tactics?

Answers

Answer:

they support cultural liberalism but take moderate to conservative fiscal stances.

AKA they became more centrist

I need help its for all my points I'm in 5th grade​

Answers

Answer: c . man

Explanation:

Answer:

c

Explanation:

Why did the articles of confederation not grant the federal government enough powers

Answers

Answer:

To prevent the government from becoming tyrannical.

Explanation:

The Articles of confederation was made by the founding fathers to specifically created a system of government that stray away form the tyrannical nature of Monarchy.

The founding fathers believe that if the power in the government is held by one king, there's nothing the people can really do if that King start abusing his power.

This is why the founding fathers did not granted the federal government enough power. They wanted the people to have every opportunity to overturn the government in case the federal government start abusing the power.

i give yo 40! please help, im in a exam

Which of the following activities will most likely help Edward decrease his stress level?

Running after school
Going to bed later
Waking up later
Eating more at breakfast

Answers

Running after school

Exercise and other physical activity produce endorphins—chemicals in the brain that act as natural painkillers—and also improve the ability to sleep, which in turn reduces stress.

Answer:

Running after school

Explanation:

Populations change from birth, death, immigration, and emigration.
Which changes would cause a population decrease?

Choose all correct answers:
-death
-immigration
-emigration
-birth

--Immigration means the action of coming to live in a foreign country.
--Emigration means the act of leaving ones own country to settle permanently in other; moving abroad

Answers

Answer: Emigration and Death

Explanation: Death is the name when people die so that decreases the population in one city or country. Immigration is when foreign people come to live in your city or country. Emigration is when people move out of your country to settle in another one. Birth is when a new child is born so that adds to the population.

According to world systems theory, peripheral nations become economically dependent on core nations, which keeps them at a low level of modernization. Please select the best answer from the choices provided T F

Answers

Answer:

True.

Explanation:

The world systems theory is a fundamental social evolution theory which states that, some developed countries such as core nations benefit while other countries such as peripheral (underdeveloped) nations are being exploited significantly.

According to world systems theory, peripheral nations become economically dependent on core nations, which keeps them at a low level of modernization.

Basically, the world systems theory divide the world into three (3) main categories and these includes;

I. Peripheral nations: these includes countries that provide cheap labor and other resources for the core nations. Some examples of peripheral nations are Haiti, Nigeria, Kenya, Sudan, Philippines, Chad, Niger etc.

II. Core nations: these are technologically advanced and well-developed countries that benefit from peripheral nations. Some examples of core nations are Germany, China, Japan, United States of America, England, France etc.

III. Semi-peripheral nations: these includes countries that are in between core and peripheral nations such as developing countries.

Answer:

TRUE

Explanation:

Edge answer

Documents from the English government such as the Magna Carta, Petition of Right, and English Bill of Rights best influenced which principles of US government? (Select 2)
1. popular sovereignty
2. limited government
3. representative government
4. rights of the nobility
5. rule of law

Answers

Answer: 5. rule of law.

Explanation:

All the above-mentioned treaties and documents contain democratic elements in their basic principles. Democracy is a system based on the rule of law. Thus, for example, the Magna Carta medieval document limited the king's reign and opened the possibility of answering before the law. Such rules are necessary for a democratic system in which the rule of law applies and the equality of all people before the law, regardless of their position in society.

Trade between mexico and new mexico established during the spanish was

Answers

Answer:

Trade between Mexico and New Mexico established during the Spanish period was open only to the Spanish.

Explanation:

Please evaluate the following statement. ‘The most important duty of the Church is to help people in need.’

Evaluate this statement. In your answer you should:

• refer to Christian teaching

• give developed arguments to support this statement

• give developed arguments to support a different point of view

• reach a justified conclusion.

Answers

Reach a justified conclusion.

The increasing use of fossil fuel is leading to its shortage. It is estimated that if the present rate of consumption continuous the reserves of these fuel will get exhausted. Moreover, their use also causes environmental pollution. Therefore, there is need for using non – conventional sources such as solar energy, wind energy and tidal energy which are renewable.
(a) What resulted in the shortage of fossil fuel?
(b) What kind of problems are faced by human beings, while using petroleum and coal.
(c) Why Solar and Wind Energy are considered as renewable?
(d) Mention one advantage and disadvantage for the use of an electric car?

Answers

Answer:

a. increasing use of fossil fuel.

b. environmental pollution.

c. as long as we have a sun, there is solar power. same with wind and water.

d. Electric car advantage is no pollution. Disadvantage if you forget to charge it it will not work.

__________ is defined as formally approved.
A.
levy
B.
ratified
C.
unicameral
D.
enumerated

Answers

Answer:

B.  ratified

Explanation:

To ratify something is to give a signed or another kind of formal consent and approval. Ratification makes the document officially valid under the law. The word ratify is usually used when something refers to political, national, and international agreements.

Merely signing something is not the same as ratifying. Ratification needs to be formally agreed to by the state and all factors of the state’s organs needed before it is formally adopted. Everyone in the agreement is considered bound and responsible when it comes to the ratification of the document and treaty.

Answer:

The answer is B- Ratified

Explanation:

That is right because I got a 100%

Giving brainliest!!!!!

Answers

Answer: A Informing Voters

Explanation:

2. To make covering clean and neat in appearance, ____ is used because the tape is not visible.
A. Adhesive tape
B. Double-sided tape
C. Masking tape
D. Packaging tape
3. The easiest way to measure the gift item is to ____.
A. Roll your box along the paper
B. Measure the tape
C. Measure the box
D. All of the above ​

Answers

Answer:

2) B. Double-sided tape

3) C. Measure the box

Explanation:

Number 2 is B because it designed to stick two surfaces together, often in a way which is not visible in the end product.

Number 3 is most likely "measure the box" because that seems to be the best way to measure the gift item.

To cover clean and neat, in appearance a double-sided tape is used because the tape is not visible, and the easiest way to measure the gift item is to measure the box. Hence the options B and C are correct.

What is the double-sided tape?

A double-sided tape is a strong type of tape and is used for mounting one side with the ability to hold up a slot of weight per square inch. It is heavy-duty tape since it can hold 90 pounds.

As to connect the object from in-between. The gift box can be measured by measuring the box size and it can be easily detected on the basis of the weight and size, and length of the box.

Find out more information about the double-sided tape.

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please help me- lololololololol

Answers

Answer:

c. printing press

Explanation:

Answer:

The printing press! It was invented around the end of the civil war.

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