When chemicals react in a closed container, which must be true?
A The mass both before and after the reaction is the same.
B. The mass both before and after the reaction is variable.
C. The same number of compounds is present both before and after the
reaction.

Answers

Answer 1

Answer:

I think its B.

Explanation:

Its b, because if we take for example, solid and liquid, two different masses, it produces different mass so it's not A. It's not c because we wouldn't know if the compounds are same or not. So, I strongly recommend you to go with B.


Related Questions

The use of coal had decreased as a result of competition form oil and ?

Answers

Why did the use of coal decrease?
There are several factors that have contributed to the gradual decline in coal consumption since 2007. One of the major factors is both the availability and price of other electricity generating fuels. These alternative fuels include, natural gas, and cleaner energy generation options like solar and wind.
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The use of coal had decreased as a result of competition from oil and gas.

The answer is Gas. An alternate answer could be Electricity.

1. What is the demographic transition model?

Answers

Answer:

The Demographic Transition Model (DTM) is based on historical population trends of two demographic characteristics – birth rate and death rate – to suggest that a country’s total population growth rate cycles through stages as that country develops economically.

Explanation:

Each stage is characterized by a specific relationship between birth rate (number of annual births per one thousand people) and death rate (number of annual deaths per one thousand people). As these rates change in relation to each other, their produced impact greatly affects a country’s total population. Within the model, a country will progress over time from one stage to the next as certain social and economic forces act upon the birth and death rates. Every country can be placed within the DTM, but not every stage of the model has a country that meets its specific definition. For example, there are currently no countries in Stage 1, nor are there any countries in Stage 5, but the potential is there for movement in the future.

Answer and Explanation:

Demographic transition is a model used to represent the movement of high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system. It works on the premise that birth and death rates are connected to and correlate with stages of industrial development. The demographic transition model is sometimes referred to as "DTM" and is based on historical data and trends.

Why is Canada’s population less than America’s population?

Answers

because the US is more popular and has warmer weather
Statistics have shown because the us has better weather and a better education

Changing steep slope into usable land is called:

Answers

Answer:

Terracing

Explanation:

Terracing is mostly used in agriculture, it is a practice of converting slopes for useful farm practices like farming and this also helps to prevent erosion by reducing the water velocity.

It is an ancient agricultural practice, where mountainous landscapes are converted to platforms.

Which items are examples of human-environmental interaction?

Answers

Answer:

road construction

home building

gold mines

Explanation: tell me if u need more info! but hope i helped!

) What is the longest river in the world?​

Answers

amazon river - 6853 km (4325 miles)

I’m pretty sure it’s the Nile. Amazon by volume but Nile by length

WHY WAS THERE SO MUCH GLOBAL WARMING DURING THE JURRASTIC PERIOD???????????????

Answers

there was so much global warming during the jurassic period because there was an increase of volcanic & seafloor spread activities which released large amounts of carbon dioxide.

Which best describes the results of the agricultural revolution?

A. Modern industrial agricultural techniques emerged.
B. People first domesticated plants and animals.
C. Hunting and gathering ceased to be relevant.
D. Agriculture was first adapted to the environment.
E. People took control over the natural environment.

Answers

Answer:

its C because none of it makes sense just do you work.

Answer:

B. People first domesticated plants and animal.

Explanation:

The first agricultural revolution was the domestication of plants and animals. all other revolutions came from this first one, like the modification of plants. That could not have happened if scientist did not know how to grow plants.

what river flow through five country.

Answers

The Danube river.
PLEASE MARK BRAINLIEST!!!

Answer:

the Danube

Explanation:

im right 100%

Which type of risk factor for underage drinking includes gang presence and income inequality?

family
social
personal
community

Answers

The answer will be community

Answer:

Which type of risk factor for underage drinking includes gang presence and income inequality?

family

social

personal

О community

Explanation:

what river system is an important Agricultural Center in Egypt​

Answers

Answer:

Agriculture used about 59 km3 of freshwater in 2000 (86 percent of total use). All drainage water in Upper Egypt, south of Cairo, flows back into the Nile and the irrigation canals; this amount is estimated at 4 km3/yr. Drainage water in the Nile Delta is estimated at 14 km3/yr.

Explanation:

what made life possible in egypt

Answers

Answer:

The Nile

Explanation:

It provided water and vegetation

Although the Great Plains region has fewer people than other areas of the country, why might a person choose to relocate there if given the opportunity?​

Answers

Answer:

Cause it was a given opportunity

Explanation:

If the asthenosphere was made of rigid rock, like the lithosphere, do you think tectonic plates would move the same way? Would we still have landforms like mountains, volcanoes, and rift valleys?

Answers

Answer:

no

Explanation:

because thew lava would not come through

Give reasons :
Tropical deciduous trees shed their leaves in the dry season.​

Answers

Answer:

Mainly to reduce water loss through transpiration

Answer:

To reduce water loss

List the three geographic regions of Central Asia.

Answers

Answer:

1. Kazakhstan. 2.Kyrgyzstan. 3.Tajikistan.

Explanation:

Answer:

Tajikistan , Uzbekistan, Kazakhstan are the three geographic regions of Central Asia

Explanation:

Brainliest?



Explain five advantages of aid

Answers

Answer:

1. saves lives

2. rebuild livelihoods and housing after a disaster

3. aid for agriculture can help increase food production

4. increase natural resources

5. encouraging aid industrial development

Which early urban hearth is NOT correctly matched?

Tigris Euphrates—modern Iraq
Mesopotamia—modern Egypt
Rio Grande de Nazca River Valley—modern Mexico
Indus River Valley—modern Pakistan
Huang-He Valley—modern China

Answers

Answer:

Rio Grande de Nazca River Valley - modern Mexico

Explanation: Mesoamerica is an urbanization hearth, which would contribute to modern Mexico; but the Rio Grande de Nazca River Valley is in Peru (not south Mexico/Central America). This answer was confirmed via quiz submission

Answer:

Rio Grande de Nazca River Valley—modern Mexico

Explanation:

this river is located in peru not mexico

What is the formula for calculating the growth
rate of a population?

Answers

Answer:

[(births-deaths+immigration-emigration)/population] x 100

or

(crude births-crude deaths)/10

What devices did people use to store information in pre industrial age?​

Answers

Answer:

they use type writter , fax , landlines , letter for storing information

Full-time farmers in the United States and Canada differ from those in other parts of the world because

A. their work is driven by technology.
B. they produce crops primarily for selling.
C. their farms are rarely family run.
D. they do not allow farms to be left fallow.
E. their products are for domestic use and export.

Answers

Answer:

A. their work is driven by technology.

Explanation:

Hope this help :D

Read the lines from "How I Learned English.”

It was an empty lot
Ringed by elms and fir and honeysuckle . . .
In the field, a blue sky above them
Tipped with cirrus.

The imagery in these lines helps readers picture

how colorful and beautiful the setting is.
how thick and green the lot’s grass is.
how windy and warm the weather is.
how dry and dusty the land is.

Answers

Answer:

A.) How colorful and beautiful the setting is.

Explanation:

Hope this helped!! :)

The imagery in these lines helps readers picture how colorful and beautiful the setting is. Thus option A is correct.

Who are the readers?

Finding and distributing knowledge relies heavily on reading. It is a crucial ability that is learned in very early childhood. Here are some reasons why studying is good for all of us and how comprehension skills are crucial to comprehending the world we live in.

A poet and literary critic offer his viewpoint on what constitutes quality poetry. He claims that knowledge and persistence are necessary to produce high-caliber poetry. Good poets are able to connect the sound of their sentences to the substance in addition to learning rhyme schemes and proper grammar. This will help to understand the theme of the line.

Therefore, option A is the correct option.

Learn more about readers, Here:

https://brainly.com/question/16391560

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What are the elements and importance of the globe?

Answers

Answer:

Elements-  a Globe is basically a miniature physical representation of the Earth. The parts of a globe include its landforms and bodies of water. A globe also includes major human inventions that embarked history.

The Importance- Globes have importance  because they help us with geography, and show us the location of distant places.

Explanation:

Hope this helps you as much as intended.

How might the Japanese megalopolis, known as the Taiheiyō Belt, differ from the Greater Wuhan Megalopolis in China?

The Taiheiyō Belt has a greater percentage of males and an older population than the Greater Wuhan Megalopolis.
The Taiheiyō Belt has a greater percentage of females and an older population than the Greater Wuhan Megalopolis.
The Taiheiyō Belt has fewer people and a younger population than the Greater Wuhan Megalopolis.
The Taiheiyō Belt has more political freedom and a younger population than the Greater Wuhan Megalopolis.
The Taiheiyō Belt has more immigrants and a younger population than the Greater Wuhan Megalopolis.

Answers

Answer:

The Taiheiyō Belt has a greater percentage of females and an older population than the Greater Wuhan Megalopolis.

Explanation:

Japanese megalopolis, known as the Taiheiyō Belt, differ from the Greater Wuhan Megalopolis in China the Taiheiyō Belt has a greater percentage of females and an older population than the Greater Wuhan Megalopolis.

What was the Taiheiyo Belt?

Taiheiyo Belt or Tōkaidō corridor has an accumulation of infrastructures as well as productive forces megalopolis in Japan. A megalopolis represents a cluster of cities, which are generally attached to metropolitan cities.  

Therefore, the population in both geographical structures differs as Taiheiyo Belt has more of the female population while Wuhan Megalopolis has more of the older population.

Learn more about geography of Japan and China here:

https://brainly.com/question/482983

which Canadian province has the most in common culturally with France ​

Answers

Answer: Quebec

Explanation:

there official language is french.

Use the drawing tool to modify the model, showing the direction of prevailing winds in the Northern Hemisphere and convection currents. Label hot and cold air on your convection currents.​

Answers

convection cells - large wind patterns in Earth's atmosphere caused by convection. Coriolis effect - the bending of currents of air or water

Label hot and cold air on your convection currents.​

Convection cells - Large wind patterns are brought on by convection in the atmosphere of Earth.

Coriolis effect - air or water currents that are curved.

What are convection currents?

By moving fluid in mass, such as water, air, or molten rock, convection currents move heat from one location to another. There is a heat or density difference within the material, which causes the flow of this fluid.

The Coriolis effect is impacted by wind speed, and it also has an impact on wind speed as a result of friction as wind speed falls. When things travel over great distances without being firmly attached to the ground, this pattern of deflection is described.

Warm material rises to the top of a fluid's convection cells, whereas cold material sinks to the bottom. In this mechanism, a fluid is heated, loses density, and is compelled into an area of higher density.

Learn more about convection currents, here:

https://brainly.com/question/12190206

#SPJ5

How has climate contributed to the distribution of population
in Asia?

Answers

Explanation:

Population booms ensure Asia emits more carbon dioxide (CO2) – one of the main causes of the Earth’s rising temperature – than any other region

Which map projection shows curved lines of longitude?​

Answers

Answer:

When the lines are going up to down, those are the lines of longitude. The prime meridian would be a line of longitude that passes through Greenwich England too.

Explanation:

Who do Sunni Muslims believe should lead the Muslim community?​

Answers

Answer:

The answer is Abu Bakr

Alaine looks outside her window and observes that it is hailing outside. Which part of the water cycle is she watching?

Precipitation
Runoff
Condensation
Collection

Answers

The answer would be ~A. precipitation~

Hope this helps

Have a great day/night

Feel free to ask any questions

Answer: A

Explanation: Precipitation

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