Answer:
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A student says that since the atomic theory is just a theory, it should not be considered useful. Which
statement best argues against the student's opinion? (2 points)
O Scientific theories change over time.
O Scientists often do not agree about specific details of scientific theories.
O Scientists often propose competing theories.
O Scientific theories do not become Scientific Laws.
O Scientific theories are the results of many experiments and observations.
Answer:
O Scientific theories are the results of many experiments and observations.
Explanation:
Going through the options;
O Scientific theories change over time.
This is true and supports the student's opinion. So wrong option!
O Scientists often do not agree about specific details of scientific theories.
This is true. However, it supports the student's opinion. So wrong option!
O Scientists often propose competing theories.
This is true. However, it supports the student's opinion. So wrong option!
O Scientific theories do not become Scientific Laws.
This is False. Theories that have withstood the test of time and countless experiments become laws. However it support's the student's opinion. So wrong option!
O Scientific theories are the results of many experiments and observations.
This is true and is against the student's opinion. This option is correct!
Which process uses the least amount of material to create electricity, coal or uranium, coal or nuclear power plant?
Answer:
nuclear power plant
Explanation:
Generation of electricity often involves the use of some kind of material or energy that is consumed as electricity is generated. There are various ways of generating electricity such as;
By burning coal
Use of a radioactive element as nuclear fuel
From wind energy
From water
From the sun, etc
Each process involves the intake of material or energy. The process that goes on in a nuclear power plant requires a radioactive fuel of which uranium is an example.
A nuclear plant uses the least amount of material (such as only 1g of uranium fuel) in electricity generation compared to the tons of coal burnt in order to generate electricity.
What is the percent of oxygen in C6H12O6?
Answer and Explanation:
C6 H12 O6=6×16=96g/mol
96/180×100=53%
How many atoms are in 2.76 moles of water?
when gas changes to liquid is it gaining or loosing energy?
Answer:
Loosing energy
Explanation:
As the particles movement in gas slows down further when it is cooled
Can someone please help me with the with this
Answer:
Chemical
Explanation:
most bacteria are ___ as they are unable to make their own food
Answer:
HETEROTROPHIC
Explanation:
Based on nutrition, organisms are classified into autotrophic and heterotrophic. Autotrophic organisms are organisms that are capable of making their own food using either light source (photosynthesis) e.g plants or chemical source (chemosynthesis) e.g some bacteria.
Contrarily, HETEROTROPHIC organisms are those that are unable to synthesize their own food themselves, hence, they rely on other organisms for their energy source. Types of heterotrophism include; saprophytism, predation etc. Most bacteria falls under this heterotrophic category because they are unable to make their own food.
Jacque is hiking in the mountains and sees a very large and colorful rock layer. It looks different than the surrounding rock layers. What is the best way for Jacque to investigate what the environment was like when this rock layer was deposited? Jacque could measure the height of the rock layer. Jacque could check if the rock layer has fossils in it. Jacque could look at the color of the surrounding rock layers. Jacque could chip off a chunk of rock from the rock layer and smell it.
Answer:
b:
Jacque could check if the rock layer has fossils in it.
Explanation:
!!!!!! that's what 4 of my teachers said
Write the following number correct to 2 significant figures: 3644000
Hurry Plz NO TIME!!!
please help. 11) Tell how sexual reproduction and asexual reproduction are alike? How are they different?
Answer:
They are alike because they both form offspring.
How they are different, sexual reproduction requires a mate, and it takes time and energy. For asexual reproduction, it does not take a mate and it takes very little time and no energy.
is Copper(II) hydroxide ionic
give two areas where the compressible nature of gas is applied
Answer:
1. Gases can be easily liquefied into very small volumes and stored in liquid form Eg in LPGA cylinders and used in homes.
2. Balloons can be easily filled with air.
The fact that a gas is easily compressible is applied in the colling devices such as air conditioners as well as in the pumping of tyres with air.
Are gases compressible?Gases are easily compressible because they do not have a definite volume. This is positively applied in many areas of life.
The fact that a gas is easily compressible is applied in the colling devices such as air conditioners as well as in the pumping of tyres with air.
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What happens to the amount of energy as it flows up the food chain
Answer:
It decreases because animals only get 10% of the energy they eat.
Explanation:
which Two of the following are pure substances*
A. Compounds
B. Elements
C. Solutions
D. Mixtures
Answer:
I think A and B
Explanation:
Answer:
A. & B.
Explanation:
Neither can be broken down into something besides an atom, the "purest" form matter can exist in. For example, if you were to break down C6H12O6 (glucose), you wouldn't be able to break down a singular atom of carbon into something different.
What is the correct order for the seasons of winter, spring, summer, and fall in the Northern
Hemisphere?
Answer:
Therefore, for temperate areas in the northern hemisphere, spring begins on 1 March, summer on 1 June, autumn on 1 September, and winter on 1 December. For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June.
Explanation:
The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
What is season?A season is a subdivision of the calendar year based on variations in the local climate, ecology, and amount of daylight hours. The axial parallel of Earth's inclinator orbit of the Sun causes seasons on Earth.
Seasons are distinguished by differences in the amount of sunlight reaching Earth's surface in temperate as well as polar areas. These fluctuations may lead certain animals to migrate or go into hibernation while others may cause vegetation to fall dormant. The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
Therefore, the correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
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sulfric acid has the chemical formula H2SO. A certain quantity of sulfuric acid contains 4.89 x 10^25 atoms of oxygen. How many moles of sulfuric acid is in the sample?
Answer:
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Can someone please help
Answer:
Water is the answer
Explanation:
Which is true of synthesis and decomposition reactions
Complete question is;
What is true of synthesis and decomposition reactions?
A) Synthesis reactions require more energy than decomposition reactions.
B) Synthesis reactions produce more products than decomposition reactions.
C) Synthesis reactions are the opposite of decomposition reactions.
D) Synthesis reactions have fewer reactants than decomposition reactions.
Answer:
C) Synthesis reactions are the opposite of decomposition reactions.
Explanation:
Correct answer is option C. This is because, Synthesis reactions are defined as those whereby substances are combined together to form larger molecules/compounds. Whereas, decomposition reactions are the opposite due to the fact that they involve the breakdown of two or more substances.
Does potassium or lithium have the smaller atomic radius? Support your answer using atomic structure (ex: energy levels, nuclear charge, attraction).
Answer:
Atomic radii increase in size as you progress down the columns of the periodic table. This is because as you add more electrons, and fill more electron shells, the total radius across the atom increases.
Answer:
lithium because it atomic number is 3
A downhill skier was able to move 560 meters in 25 seconds. What is the skiers average speed?
(Science)
Explanation:
Total distance (d) = 560 meters
Time taken (t) = 25 seconds
Average speed
= d/ t
= 560/ 25
= 22.4 m/s
Hope it will help :)
Answer:
22.4 m/s
Explanation:
What happens to the pitch when the frequency of a sound wave decrease?
A it stays the same
B it decreases by that same amount
C it increases twice the amount
D it increases by the same amount
Answer:
B
Explanation:
Pitch is determined by frequency. So if frequency increases, pitch increases and produces a higher sound. If frequency decreases, pitch decreases and produces a lower sound. Frequency and wavelength are inversely related, meaning that if frequency increases, wavelength becomes shorter and vice versa
Organisms with traits best suited to their environment, survive during what process?
A. environmental change
B. natural selection
C. populations
D. theories
Answer: According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
Which statement most accurately describes the compound formed by calcium and phosphorous?
Answer:
Bones
Explanation:
The .......................................................... Is related to its tendency to give away electrons and form positive ions
Answer:
electropositivity or metallic character.
The ability of an atom to give away electrons and form positive ions i.e cations is known as electropositivity or metallic character.
Which objects in the sky have rings or moons that revolve around them? Asteroids Comets Planets Stars
Answer:
asteroids have rings around them
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Hi, I really need help, my mental health is horrible right now and I can’t do any work, and I really just need help answering these questions because I really don’t want to get bad marks but I don’t have the motivation to do anything, thanks so much!
Now imagine that you're waiting for your soup to cool down, and you leave it on the counter while you go do your homework. Your homework is so interesting that you forget all about your soup, and now it's cold! Actually, if you were to measure the temperature, you'd find that your soup is the same temperature as the air in the room. What's going on?
Explanation:
Generally, heat flows from a hot environment to a cold (lesser temperature) environment. In this case, the soup is the hot environment and the air is the cold temperature.
Heat would continue to flow from one environment to another until thermal equilibrium is reached. At this thermal equilibrium, both environments would have the same temperature.
What is the best description of what has happened to flowers when they change color as they mature?
A. a physical reaction
B. a chemical reaction
C. a formation of a mixture
PLSSS HELP MEEE
Answer:
The answer is (A)
Explanation:
When the weather changes, nature also changes because most plants rely on photosynthesis and if they don't get as much light then they can't support as much as they used causing them to shut down parts of the plant.
Is sodium sulfide a ionic or covalent
Answer:
I would say iconic
Explanation:
please correct me if i am wrong
Sodium sulfide compound is an ionic compound. There are 2 Na atoms per 1 Sulfide atom.
Ions with opposing charges are created in ionic compounds when metal atoms transfer electrons to nonmetal atoms. Sodium gives one electron to sulphur in the case of sodium sulphide, resulting in the formation of positively charged sodium ions (Na+) and negatively charged sulphide ions (S2-). The complex is held together in a lattice structure by the electrostatic attraction between these ion pairs with opposing charges. Sodium sulfide's high melting and boiling temperatures, as well as its capacity to conduct electricity when melted or dissolved in water, are indications of its ionic nature.
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An airplane travels 200 km/h in 4 hours going to Zambales. What will be the distance and displacement?
Answer:
See explanation
Explanation:
Recall that;
Speed = Distance/time
Distance = Speed * time
Speed = 200 km/h
Time = 4 hours
Distance = 200 km/h * 4 hours = 800 kilometres
Displacement has to do with distance covered in a specified direction, in this case, the direction is towards Zambales.
Hence, the displacement is 800 kilometres towards Zambales.