Identify each wave interaction based on how it changes direction.
The wave changes direction as it bends and scatters.
The wave changes direction as it changes its speed.
The wave changes direction at an angle equal to the angle of incidence.
took a screenshot for you since the guy above is a degen
How to know how many electrons are involved in bonding of propane ?
In the bonding of propane ([tex]C_{3}H_{8}[/tex]), there are 18 electrons involved.
You must count the electrons in propane's bonding using its Lewis structure. Propane ([tex]C_{3}H_{8}[/tex]) has three carbon and eight hydrogen atoms.
How to calculate bonding electrons:
Count the molecule's valence electrons.
Three carbon atoms supply 12 valence electrons since carbon possesses four.
Eight hydrogen atoms contribute 8 valence electrons.
20 valence electrons: 12 (carbon) + 8 (hydrogen).
Single-bond atoms to form the molecule's skeleton.
Propane's skeleton is H-C-C-C-H.
To complete atom octets, distribute leftover electrons.
Start by bonding each carbon atom to the surrounding hydrogen atom with two electrons.
Distribute the remaining electrons to satisfy the carbon and hydrogen octet rule.
Count bonding electrons.
Each bond has two electrons—one from each bonding atom. Propane has nine C-H bonds, therefore bonding electrons total: 18 electrons from 9 C-H bonds.
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Place the following types of electromagnetic radiation in order from LOWEST energy to HIGHEST energy? (A) visible light (B) gamma rays (C) radio waves Question 9 options: A, C, B C, A, B B, C, A C, B, A
Answer:
C, A, B
Explanation:
hope this helps!
To be honest I really just need help on figuring this out
Answer:
d
Explanation:
a change in colour over several generations would happen as a result of a preadeator atacking that specfic colour and the darker colour not being known by the preadotor/ less easily spoted by the preadator and allowing them to survive better
Answer:
the light coloured butterfly undergo gene mutation to develop a darker colour
Explanation:
As the time passed,the trunk of the tree due to air pollution and other factors turned dark so the light coloured butterflies were easy visible to predators.they underwent gene mutation and changed their colour so they can survive.
PLEASE HELP! ill give brainliest if it ACTUALLY helps-
which is a physical change?
a.) rusting iron
b.) burning paper
c.) cracking egg shell
d.) reacting baking soda and vinegar
Answer:
C) cracking an egg shell
Explanation:
because it is ireverable
YW have a good day :)
Answer: C.
Explanation:
because you are simply breaking it you are not making a chemical reaction.
The model shows how carbon dioxide can be cycled through plants and animals.
What is the source of carbon dioxide in the atmosphere, as shown by this model?
A. photosynthesis by plants and animals
B. photosynthesis by plants only
C. respiration by animals only
D. respiration by plants and animals
D. respiration by plants and animals
What is the shape of planetary orbits?
Question 1 options:
circular
square
rectangular
elliptical
This is a picture of a plant cell.
Select all organelles listed here that you would also find in an animal cell.
Choose all that apply:
12
8
4
1
2
Answer:
3 4 8
Explanation:
Which statement below gives an example of thermal expansion?
A. drops of water form on the outside of a glass of water
B. a puddle of water disappears in the sunshine
C. frost forms on a window
D. the volume of a liquid in a container increases with temperature
Answer:
i think its D.
Explanation:
Explain how the process of weathering changes rock to eventually, over a long time, to become soil.
Answer:
Rocks turn into the soil through the process of weathering. Weathering is when rocks are broken down into smaller pieces. Over time a large rock is broken into smaller and smaller pieces, eventually turning into soil. Chemical weathering occurs when water gets inside of a rock and reacts with some of the mineral components of the rock, chemically changing them and weakening the rock's structure. This causes the rock as a whole to break down, and over time chemical weathering can break a rock into small enough pieces to become soil. Once the rock is in very tiny pieces, it mixes together with organic and other inorganic elements to form the soil we are familiar with.
Explanation:
Waste to be evaluated currently goes to a large trash container outside.
How can we monitor our waste managment in the enviorment?
Answer:
Reduce our waste, and find ways to recycle anything that has to be disposed in mass quantity.
Explanation:
Select all that apply.
Which of the following equilibria will shift to the left when the temperature is increased? [ΔH (kJ/mol) values are given in parentheses.]
(a) S + H2 ⇌ H2S ΔH (−20)
(b) C + H2O ⇌ CO + H2 ΔH (131)
(c) H2 + CO2 ⇌ H2O + CO ΔH (41)
(d) MgO + CO2 ⇌ MgCO3 ΔH (−117)
(e) 2CO + O2 ⇌ 2CO2 ΔH (−566)
The equilibrium of the reaction (a), (d), and (e) will shift to the left side when the temperature is increased.
What is equilibrium law?Equilibrium law states that if the dynamic equilibrium gets disturbed by changing the conditions such as temperature, pressure, etc., then to reestablish equilibrium, the position of equilibrium will shift to counteract the change.
As we know that if the change of enthalpy (ΔH) is negative then the reaction is exothermic in nature and if the change in the enthalpy is positive the reaction is endothermic in nature.
Therefore, the reaction (a), (d), and (e) are exothermic reactions, and the reaction (b) and (c) are endothermic reactions.
On increasing the temperature, if the forward reaction is exothermic. Then the equilibrium will shift to the reactant side or left so that excess heat will be absorbed in the backward reaction.
Therefore, when the temperature is increased, the reaction (a), (d), and (e) will shift the equilibria to the left side.
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A student places six plants of equal sizes into six different, equal-sized pots containing the same amounts of potting soil and labels the pots U, V, W, X, Y, and Z. Using two pots in each of the three experiments, the student varies the amounts of sunlight, water, or air one plant receives but leaves the other pot unchanged. The tables show the factor varied in each pot and the observations made by the student after one week.
Which conclusion best explains the connection among all three experiments?
A. All plants grown in pots require the same amounts of the abiotic factors for their growth and survival.
B. All plants of the same size require the same amounts of the abiotic factors for their growth and survival.
C. The plants require a balance of all abiotic factors for their growth and survival.
D. The plants depend very little on abiotic factors for their growth and survival.
Answer: I would go with D.
Explanation: Sorry if it is incorrect
Which activity requires people to use fossil-fuel resources?
O A. Buming wood in a campfire
O B. Turning a turbine on a wind farm
O C. Eating fruit, vegetables, and chicken
OD. Powering a furnace with natural gas
Answer:
b and d
Explanation:
How does carbon move around on Earth?
Answer:
Carbon moves from plants and animals to soils. When plants and animals die, their bodies, wood and leaves decays bringing the carbon into the ground. Some is buried and will become fossil fuels in millions and millions of years. Carbon moves from living things to the atmosphere.
Answer:
Explanation:
How does carbon move between the 4 spheres on earth?
CARBON ENTERS THE ATMOSPHERE THROUGH DEATH/DECAY OF PLANTS & ANIMALS, FOREST FIRES, RESPIRATION, BURNING FOSSIL FUELS AND VOLCANIC ERUPTIONS. CARBON ENTERS THE HYDROSPHERE BY DISSOLVING INTO OCEAN WATER. CARBON ENTERS THE GEOSPHERE THROUGH DEATH/DECAY OF PLANTS & ANIMALS.
The diagram shows a plant cell.
Which structure controls every activity of the cell?
A. structure 1
B. structure 2
C. structure 3
D. structure 4
Answer:
B. structure 2
Explanation:
It represents nucleus which is the brain of the cell
As ocean water salt concentration increases, the _____.
Question 1 options:
water density increases and rises to the top of the sea.
water density decreases and rises to the top of the sea.
water density decreases and sinks to the bottom of the sea.
water density increases and sinks to the bottom of the sea.
Answer:
The answer is D. water density increases and sinks to the bottom of the sea.
Explanation:
As water concentration increases, the density does as well, I believe it would sink to the bottom of the sea.
Santee Cooper is stocking lakes, Marion and Moultrie, with 109,000 sterile grass carp. The grass carp, which eat hydrilla (invasive species), are the most effective and least intrusive means to control the weed. What type of control are they using?
1. invasive
2. biological
3. physical
4. chemical
Which statement best describes the Sun-Earth-Moon system during a spring
A. The Moon's orbit is perpendicular to Earth's orbit.
B. The Sun, Earth, and the Moon are arranged in a straight line.
O C. The Sun, Earth, and the Moon form a night angle.
D. The Moon's orbit brings it closer to Earth.
(extra points for who ever answers first and the right answer please)
Answer:
That answer is B
Explanation:
The sun's gravity pulls on earth's water while the moon gravity pulls on water in the same places
whats the answers 1-10 on brainpop nervous system i need help
Answer: 1.What is the best synonym for the word intricate? Complex. 2.What might happen if your body lacked neurotransmitters? Your nerve cells could not communicate with one another. 3.How are neurotransmitters different from the impulses that travel along the bodies of nerve cells? The impulses are electrical; neurotransmitters are chemical.4.What process is governed by the autonomic nervous system? Digesting Food 5.What is an example of a reflex? Blinking.
Explanation:
How was Earth’s atmosphere changed during the Great Oxygenation Event?
Consequences of oxygenation. Eventually, oxygen started to accumulate in the atmosphere, with two major consequences. Oxygen likely oxidized atmospheric methane (a strong greenhouse gas) to carbon dioxide (a weaker one) and water.
Answer: .Early organisms created oxygen from other gases in the atmosphere
Explanation:
It is believed that the atmosphere emerged about 4,500 million years ago, by a process that can be explained in five stages.
In the first stage, the atmosphere was shaped by volcanic emanations, such as water vapor, carbon and sulfur dioxide, and nitrogen. At this point, oxygen was barely present.
In the second stage, as the Earth cooled, the water vapor condensed and formed the oceans. Carbon dioxide reacted with the rocks of the earth's crust to create carbonates - (CO32-); a portion of them, when dissolved in the seas, generated salt water.
In the third stage, approximately 3.500 million years ago, bacteria appear, capable of carrying out photosynthesis, that is, of producing oxygen. This facilitated the development of marine life.
Once the atmosphere obtained sufficient oxygen, the fourth stage appeared, the evolution of large organisms as animals capable of breathing air.
This is how the current atmosphere containing the gases created in each of the previous phases was reached. These are kept in motion by winds and rains, allowing humans, and other living organisms, to breathe. For this reason, without them there would be no life on the planet.
Which part is pointing to the gel-like liquid that holds the organelles, and which is the site of much of the cell's metabolism?
Select one:
4
2
1
6
8
Answer: hope this helps ♡
2 and 3
Explanation:
The gel-like liquid that holds the organelles is called the cytoplasm. (2)
The site of much of the cell's metabolism is called the mitochondria. (3)
Help this is science class and it’s not necessary my best class and I’m kinda slow at learning
Answer:
d
Explanation:
you can elimate a as your body has a fever to fight the infection and antibiotics are just there to assist. b is elimanated as slowing the life cycle would be modifying the germs genetic's which is not how antibiotcs work they just your bodys imune system. c is elminated as stated in the question the virus came back which not be possible if the bacteria stoped reproducing. that leaves d which means that yould likley be perscribed a diffrent anti biotic
The diagram shows molecules entering and leaving a cell over a period of time. What controls this process?
Select one:
the ribosomes
the vacuoles
the cell wall
the cell membrane
Answer:
I believe it is The Cell Wall or The Cell Membrane
other that uses probing are
Answer:
Clarification. A clarification question requires a simple fact-based response. ...
Recommendation. A recommendation probing question involves a certain degree or persuasion. ...
Example. An example question is ideally suited for responses that may be vague or confusing. ...
Extension.
Explanation:
Draw the three-carbon hydrocarbons propane, propene, and propyne. Classify each molecule, and explain the differences between them. Answer:
The term hydrocarbon refers to a compound that is composed of only hydrogen and carbon.
What is a hydrocarbon?The term hydrocarbon refers to a compound that is composed of only hydrogen and carbon. The compounds propane, propene and propyne are alkane, alkene and alkyne respectively.
The structure of each of the molecules are shown in the image attached to this answer. The compounds contain single, double and triple bonds respectively.
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The amount of coal burned to produce electricity by a typical coal plant in the United States during a three year period has increased by 30%.
What immediate impact will this increase in the consumption of coal have on the environment?
A. a decrease in freshwater resources
B. an increase in non-biodegradable wastes
C. an increase in greenhouse gas emissions
D. a decrease in atmospheric O2
The structure that the arrow is pointing to holds water for this plant cell. This structure is a - ?
Select one:
ribosome
cell wall
vacuole
mitochondria
Answer:
that is a vacuole.
Explanation:
Which of the following is the term for the heaviness on something's surface that exerts a force over an area
pressure
sediment
deposition
eruption
Answer:
A
Explanation:
I think it's pressure. Using the process of elimination, sediment is the matter that's on the bottom of a liquid or solution, deposition is the process of deposing, eruption is the process of erupting, and pressure's formula is force/area, so pressure is the answer.
how do i stop chewing my nails?
Answer:
keep your nails short
Explanation:
it will help you not to bite it
Answer:
1. Keep your nails trimmed short. Having less nail provides less to bite and is less tempting.
2. Apply bitter-tasting nail polish to your nails. Available over-the-counter, this safe, but awful-tasting formula discourages many people from biting their nails.
3. Get regular manicures. Spending money to keep your nails looking attractive may make you less likely to bite them. Alternatively, you can also cover your nails with tape or stickers or wear gloves to prevent biting.
4. Replace the nail-biting habit with a good habit. When you feel like biting your nails, try playing with a stress ball or silly putty instead. This will help keep your hands busy and away from your mouth.
5. Identify your triggers. These could be physical triggers, such as the presence of hangnails, or other triggers, such as boredom, stress, or anxiety. By figuring out what causes you to bite your nails, you can figure out how to avoid these situations and develop a plan to stop. Just knowing when you’re inclined to bite may help solve the problem.
6. Try to gradually stop biting your nails. Some doctors recommend taking a gradual approach to break the habit. Try to stop biting one set of nails, such as your thumb nails, first. When that’s successful, eliminate your pinky nails, pointer nails, or even an entire hand. The goal is to get to the point where you no longer bite any of your nails.