Given the balanced equation representing a reaction:
Fe2O3 + 2Al Al2O3 + 2Fe
During this reaction, the oxidation number of Al changes from
A) +3 to 0 as electrons are transferred
B) +3 to 0 as protons are transferred
C) 0 to +3 as electrons are transferred
D) 0 to +3 as protons are transferred
Answers
Answer:
C) 0 to +3 as electrons are transferred
Explanation:
\(Fe_{2}O_{3} + 2Al^{0} --> Al^{+3}_{2}O_{3} + 2Fe\\\\Al^{0} -3e^{-}--> Al^{+3}\)
Related Questions
I’ll give branliest to the best answer! Thanks!
Answers
I'll give Brainliest!!!
Which of the following is not a physical change?
A.sublimation of iodine C. tearing a piece of cloth
B. burning of wax in a candle D. dissolving sugar in a tea
Answers
Answer: B. Burning of wax in a candle
Explanation: Burning of wax is a chemical change due to the combustion of fuel in the presence of oxygen to produce carbon dioxide. A physical change part of it is when the wax of candle melts and the shape is lost.
Match these items.
1. imprint of plant or animal
original-remains fossil
2. undecayed plant or animal part
carbonized fossil
3. replaced by a mineral
petrified fossil
4. only carbon remains
cleavage
5. mountain
geology
6. from magma
metamorphic
7. from physical and chemical changes
igneous
8. sandstone
print fossil
9. helps identify rocks
landform
10. science of Earth
sedimentary
Answers
1. print fossil
2. carbonized fossil
3. petrified fossil
4. cleavage
5. landform
6. igneous
7. metamorphic
8. print fossil
9. geology
10. sedimentary
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The print fossil, original-remains fossil, petrified fossil, carbonized fossil, landform, igneous, metamorphic, sedimentary, cleavage, and geology are the respective matches as given in the question.
Print fossil is imprint of plant or animal and basically known as fossil impression. Original-remains fossil comprises of the original tissues and parts of organism and undecayed plant or animal part. Petrified fossil is replaced by a mineral. Carbonized fossil is only carbon remains. Landform is a mountain. Igneous is from magma.
Metamorphic is from physical and chemical changes. Sedimentary rocks are sandstone. Cleavage helps to identify rocks. Geology is the study of science of earth.
Learn more about rocks and fossils:
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What does this diagram represent?
A) a turbine
B) a motor
C) an electromagnet
D) a generator
Answers
Answer:
Option (D) A Generator
Explanation:
A generator is an equipment that has to do with the production of electricity by the use of electromagnetic induction. The generator has split rings that make contact with the exterior.
Learn what is a Generators here
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Hope my answer helps you✌️
Mark BRAINLIEST
It is a generator since the electromagnetic radiation makes the coil and rod to spin
Hope y’all can see this, I need help
Answers
Answer:
b
Explanation:
i hope this helps, wish u luck
Answer: D or only 2 correctly describe the importance of soil
Explanation: Don't know what to put here.
8.
A sheep owner is caring for a sick lamb that has a severe navel infection. He gives the
lamb 2 cc of Ampicillin 4 times a day for three days. If each cc contains 125 mg of Ampicillin what is
the total number of mg of Ampicillin given to the lamb?
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Answer:
900 mg
Explanation:
Please help quickly. Just tell me the color so you dont have to type it out
Answers
Simple and complex molecules are similar in that they both involve ____ atoms A water B simple C bonded D complex
Answers
Answer:
The answer is C.
Explanation:
Please give brainliest
Answer:
D
Explanation:
complex, in chemistry, a substance, either an ion or an electrically neutral molecule, formed by the union of simpler substances (as compounds or ions) and held together by forces that are chemical (i.e., dependent on specific properties of particular atomic structures) rather than physical.
How is the momentum of an object determined?
What happens every time one of the boys playing ping pong hits the ball?
How could the boy playing ping pong keep from hitting the ball off the table?
I GIVE 20 PTS PLS HEELP
Answers
Answer: He needs to hit the ball with less force.
Explanation:
hope this helps
2. Based off the answer to the first question, by hitting the ping pong ball, momentum is transferred from the boy to the ball. Causing the ball to have more velocity/speed and gain more momentum.
3. Momentum before = momentum after
Every time the ball hits the table, some momentum transfers from the ball to the table. Every time the player hits the ball, some momentum transfers from the player to the ball. This allows the player to continue playing ping pong as the ball always has momentum.
Which of the units below could be used to measure time? Check all that apply.
Minutes (min)
Meters per second (m/s)
Miles (mi)
Hours (hr)
Boxes per minute (boxes/min)
Kilometers (km)
Second (s)
Miles per hour (mph)
Feet (ft)
Answers
What kind of rocks would you expect to see on Mars? What evidence supports your response?
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How to work out the relative mass of potassium? What is the calculation? ( explained very easily )
Answers
Answer:
39
Explanation:
Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.
———————————
(1/12)th Mass of one C12 atom
Organisms in the abyss are very different from the surface organisms we live with. What factor listed below is NOT a reason for this?
A; Temperature is much lower in the abyss
B; Sunlight does not reach to the abyss
C; Organisms in the abyss are aliens
D; Pressure is very high in the abyss
Answers
Answer:
The answer is C
Explanation:
Good luck!
Answer:
llega al abismo C; Los organismos en el abismo son extraterrestres
Explanation:
Match the term to its definition (Lessons 6.03, 6.04 and 6.05)
(i can't fit this all without confusion)
Answers
Answer: the first paragraph is rain forest biome and the 2nd one is arctic tundra biome and finally the last paragraph is ocean or marine biome
Explanation:
rain forests have warm temperatures and include alot of animals and plants , artctic tundra biome includes cold temperatures ice stuff and all that and ocean or marine biome is pretty much just the ocean with seals , whales and marine life yk.
hi pls answer i will give brainiest
Answers
is copper a renewable resource? explain your reasoning
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Please help me por favor :'(
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What is one example of a scientific model? (this is science I don't know why can't find it on "pick a subject" so yeah)
Answers
Answer:
Explanation:
I’ll try helping
HELPPPPP 17 POINTS
based on what you know about the climate of each type of biome (rainfall and temperature), think about which biomes would have high biodiversity and which ones would have low biodiversity.
Taiga (coniferous forest)
Rainforest
Marine
Tundra
Desert
Temperate
Deciduous
Forest
Answers
Rainforests are forests characterized by high and continuous rainfall, with annual rainfall in the case of tropical rainforests between 2.5 and 4.5 metres (98
If you are leading a team to clean an oil spill in rough waters, which of the following methods would be most effective to clean the oil?
Install booms made from, or with, sorbent materials around the oil spill.
Install hard booms around the oil spill.
Coat the surface of the water with a sorbent material.
Wait until the water calms down and then install booms to contain the spill.
Answers
Answer:Install booms made from, or with, sorbent materials around the oil spill.
Explanation:Dispersants and booms and skimmers are the most frequently used methods to clean up ocean oil spills. All methods have advantages and disadvantages. The effectiveness depends on the situation – the amount and type of oil, the ocean currents and tides and the weather.
Explanation: Dispersants and booms and skimmers are the most frequently used methods to clean up ocean oil spills. All methods have advantages and disadvantages. The effectiveness depends on the situation - the amount and type of oil, the ocean currents and tides and the weather.
(Science) Please help with question 3.
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Can someone please help me with this!?
thanks ^^
Answers
Answer:a I think
Explanation:
Answer:
I'd say the 4th one!
Explanation:
We can rule out the 1st option, as there are several rocks which are less dense than the black rocks mentioned.
The 2nd one cannot be inferred from only one sample of a green rock!
The 3rd one is simply false, as there's a pink rock which has a density higher than 2.7.
So, we are left with the 4th option! :)
Where is the DNA stored in a cell?
Answers
Answer: nucleus
Explanation:
Procedure and Data (20 points)
1. Remove the label from a 2- or 3-liter plastic soft drink bottle and wash the bottle. Be sure to rinse it very well so that no soap residue remains. Let the bottle dry.
2. Use a marker to draw a line around the bottle, about one-third of the way up from the bottom.
3. Use scissors to cut along the line you drew on the bottle. To start the cut, poke a hole in the bottle at some point on the line.
4. Place about 2 inches of gravel or pebbles in the bottom of the bottle. This layer will be a place for excess water to collect. It will keep the soil from getting too wet. (Optional: If you want your terrarium to last longer, sprinkle some activated charcoal and moss on top of the gravel or pebbles.)
5. Fill the remaining space in the bottom of the bottle with moist potting soil or dirt. Gently press down on the soil with a gloved hand until the surface of the soil is about 1 inch below the rim.
6. Add plants to the terrarium.
a. If you are using seeds, use your pinkie finger to make 8 to 10 small depressions in the soil. They should be about 0.5 inches deep. Place 1 or 2 seeds in each hole and cover them with soil.
b. If you are using live plants, remove 2 or 3 small plants from their containers. Be sure to keep the root ball intact. Plant them in the soil.
7. Pour tap water onto the soil so that it is moist but not completely soaked. Just a little bit of water should pass through to the pebbles. You should use less than 1 cup of water.
8. Put the bottle back together by sliding the top part onto the bottom part. Keep the top on the outside. You may need to squeeze the rim of the bottom section so the top section will fit around it.
9. Place the cap on the terrarium if it is not on already. Your setup should look like this if you started with young plants:
10. Describe your terrarium, including what you put in it and where those materials came from. Attach a photo or draw a diagram of your terrarium. Add labels to identify the important parts. (8 points)
11. Place your terrarium next to a window where it will receive plenty of natural sunlight. Do not place the terrarium outdoors. Observe the terrarium. If you planted seeds, wait until they sprout to begin recording what you see. If you start with live plants, you can begin recording your observations the next day. Make observations for four days in a row. Look at the terrarium first thing in the morning and at the same time each afternoon. Take note of where water can be observed. Look at how much water is in the pebbles and on the sides at the top of the terrarium. Record your data in the table below. (8 points)
Data Table for Observations in Bright Light
Day
Morning: General observations
Morning: Observations of water
Afternoon: General observations
Afternoon: Observations of water
1
2
3
4
12. Move your terrarium away from the window so that it gets less sunlight. It should still receive some natural light. Continue your observations for two more days. Record your data in the table below. (4 points)
Data Table for Observations in Dim Light
Day
Morning: General observations
Morning: Observations of water
Afternoon: General observations
Afternoon: Observations of water
5
6
13. If you want to continue to watch your plants grow, place your terrarium where you think they will grow best. If you are done with your terrarium, collect the materials inside and dispose of them as instructed by your teacher. Rinse and recycle the plastic bottle.
Analysis and Conclusions (30 points)
1. Explain how your terrarium modeled each of the following processes in the water cycle. (10 points)
Condensation:
Evaporation:
Precipitation:
Infiltration:
Transpiration:
2. Draw a diagram to show how your terrarium modeled the water cycle. Include labels for the five processes in question 1. Add arrows to show how water moves through the water cycle. (10 points)
3. How did the force of gravity affect the movement of water in your terrarium? (2 points)
4. Compare your observations of the terrarium when it was in bright light and dim light. What can you conclude about how sunlight affected the water cycle in your terrarium? (4 points)
5. What is one advantage of using a terrarium to model Earth's water cycle? Explain. (2 points)
6. What is one way in which you could improve your terrarium in order to show more parts of the water cycle? (2 points)
Answers
Is this asking us to do a project for you?
Analysis and Conclusions:
1. Explain how your terrarium modeled each of the following processes in the water cycle. (10 points)
Condensation: In the terrarium, condensation is modeled when water vapor from the soil and plants rises, cools down, and turns into droplets on the inner surface of the bottle.
Evaporation: Evaporation is modeled when water from the soil and plants evaporates and rises as water vapor in the enclosed space of the terrarium.
Precipitation: Precipitation is not directly modeled in the terrarium, as there is no mechanism for rain to fall back into the soil. However, the condensation on the inner surface of the bottle can be seen as a form of "internal precipitation."
Infiltration: Infiltration is not directly modeled in the terrarium, as there is no underground or soil surface for water to infiltrate into.
Transpiration: Transpiration is modeled when water is absorbed by the plant roots, travels through the plant, and then evaporates from the plant's leaves, contributing to the water vapor in the terrarium.
2. Draw a diagram to show how your terrarium modeled the water cycle. Include labels for the five processes in question 1. Add arrows to show how water moves through the water cycle.
(Unfortunately, I cannot see your diagram, so I'm unable to provide specific feedback on it.)
3. How did the force of gravity affect the movement of water in your terrarium? (2 points)
The force of gravity caused water to move downward from the soil to the gravel or pebbles at the bottom of the terrarium. It also caused excess water to collect at the bottom of the terrarium.
4. Compare your observations of the terrarium when it was in bright light and dim light. What can you conclude about how sunlight affected the water cycle in your terrarium? (4 points)
Observations in Bright Light:
- More evaporation and transpiration were observed due to increased sunlight.
- Condensation occurred more prominently on the inner surface of the bottle.
- Water levels in the pebbles were lower due to increased evaporation.
Observations in Dim Light:
- Reduced evaporation and transpiration were observed due to less sunlight.
- Condensation on the inner surface of the bottle might have been less noticeable or slower.
- Water levels in the pebbles remained relatively stable.
Conclusion:
Sunlight plays a significant role in the water cycle within the terrarium. It drives evaporation from the soil and plants, leading to more condensation and a higher water vapor concentration inside the terrarium. In dim light conditions, these processes are slowed down.
5. What is one advantage of using a terrarium to model Earth's water cycle? Explain. (2 points)
One advantage of using a terrarium to model Earth's water cycle is that it provides a contained and observable environment. It allows students to witness and understand various stages of the water cycle, including evaporation, condensation, and transpiration, in a small-scale setting. It can be a visual and hands-on approach to learning about these natural processes.
6. What is one way in which you could improve your terrarium to show more parts of the water cycle? (2 points)
To show more parts of the water cycle, you could create a mechanism for precipitation within the terrarium. For example, you could introduce a small spray bottle and periodically mist the plants inside the terrarium to simulate rain or external precipitation. This would add an additional aspect to the water cycle modeling and demonstrate the effect of precipitation on the enclosed environment.
Johnny has 4 Cups of hot cocoa. The instructions tell him to add 1 pint of water for every 2 pints of cordial. How much water should he add?
Answers
The forces from below the surface that change the surface of the earth are
Erosion
Earthquakes
Volcanoes
Living things
Weathering
Faulting
Folding
Glaciers
Answers
Correct! The forces from below the surface that change the surface of the Earth include:
1. Erosion: The process of wearing away the Earth's surface by wind, water, ice, or other geological agents.2. Earthquakes: Sudden movements of the Earth's crust caused by the release of energy in the Earth's interior, resulting in shaking and sometimes surface displacement.3. Volcanoes: Openings in the Earth's crust through which molten rock, gases, and ash erupt onto the surface. Volcanic activity can lead to the formation of new landforms and alteration of existing ones.4. Weathering: The breakdown and alteration of rocks and minerals at or near the Earth's surface due to various physical, chemical, and biological processes.5. Faulting: The movement and displacement of rock layers along a fault line, typically caused by tectonic forces. This can result in the formation of new landforms or changes in the existing ones.6. Folding: The bending or warping of rock layers due to tectonic forces, resulting in the formation of folds and mountain ranges.7. Glaciers: Large masses of ice that slowly move over the Earth's surface, eroding the land and shaping the landscape through processes like plucking and abrasion.8. Living things: While not a direct force from below the surface, living organisms can play a role in shaping the Earth's surface through activities such as burrowing, root growth, and vegetation cover.These forces, both natural and influenced by living organisms, contribute to the continuous changes in the Earth's surface over time.
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Answer: Incorrect
Explanation: Glaciers don't form from forces from below
Match the following.
Drag the appropriate labels to their respective targets.
Answers
Answer:
oxygen - O2
chlorine- Cl2
neon- Ne
calcium- Ca
iodine- I
hydrogen- H2
Ne₂(g) - Neon gas (Ne)
I(s) - Iodine solid (I₂)
Ch(g) - Chlorine gas (Cl₂)
Ca(s) - Calcium solid (Ca)
O(g) - Oxygen gas (O₂)
H2(g) - Hydrogen gas (H₂)
Cl(s) - Chlorine solid (Cl₂)
O2(g) - Oxygen gas (O₂)
1. Ne₂(g) - This label represents the chemical formula for neon gas, which is Ne. Neon is a noble gas that is commonly used in neon signs due to its bright orange-red glow when an electric current is passed through it.
2. I(s) - This label represents the element iodine in its solid state. Iodine is a nonmetallic element that exists as a purple-black solid at room temperature.
3. Ch(g) - This label represents a gas called chlorine, which is chemically represented as Cl₂. Chlorine is a halogen gas that is used as a disinfectant and in the production of various chemicals.
4. Ca(s) - This label represents the element calcium in its solid state. Calcium is an alkaline earth metal that is commonly found in rocks, shells, and bones. It is essential for the proper functioning of our bodies and is also used in construction materials.
5. O(g) - This label represents oxygen gas, which is chemically represented as O₂. Oxygen is a colorless and odorless gas that is essential for respiration and the combustion of fuels.
6. H2(g) - This label represents hydrogen gas, which is chemically represented as H₂. Hydrogen is the lightest and most abundant element in the universe. It is used in various industries, such as the production of ammonia and petroleum refining.
8. Cl(s) - This label represents the element chlorine in its solid state. As mentioned earlier, chlorine is a halogen gas, so the correct label for chlorine in its solid state should be Cl₂(s).
9. O2(g) - This label represents oxygen gas, which is chemically represented as O₂. As mentioned earlier, oxygen is a colorless and odorless gas that is essential for respiration and the combustion of fuels.
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does the atom of Hydrogen Flouride have an electric charge?
Answers
Answer:
yes
Explanation:
it has a single electron
Answer:
the polar covalent bond, HF.
The more electronegative (4.0 > 2.1) fluorine pulls the electrons in the bond closer to it, forming a partial negative charge. The resulting hydrogen atom carries a partial positive charge.
Explanation:
Why are cellular respiration and photosynthesis opposite processes?
This is in science for 7th grade
Answers
Answer:
photosynthesis removes carbon dioxide from the atmosphere while respiration puts back carbon dioxide.
Explanation:
hope this helps
Covalent bonds usually form when a nonmetal combines with a metal.
True or false
Answers
Answer:
True
Explanation: Covalent bonds are created when a nonmetal and metal combine. Ionic bonds are created when metal and metal combine
Answer:
true
Explanation: