Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Dalton turned Democritus' views on atoms into a scientific theory by employing experimental methods. Atoms can join or detach during chemical processes, but they never transform into a different atom.
Dalton was an excellent polymath, a natural philosopher, and a real scientist. His thorough investigations prompted him to suggest an early atomic theory for which exceptions would be difficult to uncover today:
Dalton offered the following:
Atoms are microscopic particles that make up elements. Atoms of the same element have the same size and mass; however, atoms of other elements have varying sizes and masses when compared to atoms of other elements. Subdivision, creation, and destruction of atoms are all impossible.
All of these ideas were developed after a great deal of testing. Other researchers may replicate his work, and new findings could be included into this atomic idea.
Democritus, on the other hand, was a 5th-century BC Greek philosopher. He conducted no experimental work as far as we know, and none of his publications have survived. He postulated that matter was made up of a single indivisible element known as an atom; the word atom originates from the Greek word oos, which meaning "uncuttable" or "indivisible." So the name atom might be a homage to Democritus.
Someone pls help me I will make you brain
Answer:
lll and ll
Explanation:
Which statement correctly compares ice and liquid water?
A. Both liquid water and ice have definite shapes.
B. Particles of liquid water have more energy than particles of ice.
C. Liquid water has a lower temperature than ice.
D. Ice has a definite volume, but liquid water does not.
Answer:
B. Particles of liquid water have more energy than particles of ice.
Explanation:
We can work this out through eliminating the wrong statements.
A. Both liquid water and ice have definite shapes.
This is wrong because, as stated in the question, water is a liquid, and one of the properties of liquids is that they change shape to fit the shape of their container. If it changes shape, it does not have a "definite" shape.
B. Particles of liquid water have more energy than particles of ice.
This is correct, and here is why. There are 3 states of matter: solid, liquid and gas. As you apply heat energy to an object at each state, the particles receive more energy and can move around more (this is kinetic energy). In the case of liquid (water) and solid (ice), particles in solids do not have much energy and stay in rigid formations. They do vibrate slightly, but only on the spot (this is what gives solids "definite" shapes). On the other hand, particles in liquids have more energy than particles in solids, which means that they can move more (more kinetic ENERGY) and do not stay in formations (this is why they do not have "definite" shapes). Therefore, particles in liquids (water) have more energy than particles in solids (ice), and this statement is correct.
C. Liquid water has a lower temperature than ice.
This is wrong because liquids have more energy than solids. As explained earlier, the reason why particles in liquids have more energy is because more HEAT energy has been applied to them. In the same way, solids have less energy because less HEAT energy has been applied to them. Less heat means a lower temperature. (Also you can use common sense for this one, ice feels colder than liquid water, right?)
D. Ice has a definite volume, but liquid water does not.
This is wrong because of the law of conservation of mass. This law states that particles (or matter or volume) cannot be created or destroyed. When ice melts and becomes liquid water, it has not lost volume: the particles have just gained more energy. This question is most likely there to confuse you, because all substances have definite volumes.
I hope this helps!
A mixture of neon and argon gases exerts a total pressure of 2.39 atm. The partial pressure of the neon alone is 1.84 atm, What is the partial pressure of the argon?
Answer:
0.55 atm
Explanation:
According to Dalton's law of partial pressures,
The total pressure is the summation of the partial pressures of individual gases in a sample of non-reactive gases.
Since Neon and Argon are noble gases, they do not react with each other. So we can apply Dalton's partial pressure law.
P total = P Ar + P Ne
2.39 atm = P Ar+ 1.84 atm
P Ar = 2.39 atm - 1.84 atm
= 0.55 atm
According to the Dalton's law of partial pressure the partial pressure of the argon is 0.55 atm.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
In this case, pressure of gas argon is obtained by subtracting pressure of gas neon from the total pressure ,that is 2.39-1.84=0.55 atmosphere.
Thus ,the partial pressure of gas argon in atmosphere is 0.55 atmosphere.
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Which choice is an element?
A. Salad
B. Sugar
C. Water
D. Potassium
Answer: D. Potassium
Explanation:
A. Salad- a mixture of vegetables or fruits❌
B. Sugar- a compound made up of many elemnts❌
C. Water- a molecule made up of two elements (water and hydrogen)❌
D. Potassium- the only pure element of the options provided.✅
Answer:
D, potassium
Explanation: took test ! btw
2. A student wants to calculate the heat gained of 100 grams of water in order to
calculate the specific heat of a metal in the following problem. The water is
heated from 25C to 50C when the metal is added. The specific heat of water is
4.18 J/gºC. Use Q=m x CXAT*
5,225 J
10,450 J
20,900 J
Taking into account the definition of calorimetry, the correct answer is the third option: The heat exchanged is 10,450 J.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
The amount of heat (Q) necessary to vary the temperature of a mass (m) of a substance is proportional to the change in its temperature (∆T) and to that mass. So, the equation that allows calculating heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
c= 4.18 [tex]\frac{J}{gC}[/tex]m=100 gΔT= Tfinal - Tinitial= 50 C -25 C= 25 CReplacing in the expresion for calorimetry:
Q = 4.18[tex]\frac{J}{gC}[/tex]× 100 g× 25 C
Solving:
Q= 10,450 J
Finally, the correct answer is the third option: The heat exchanged is 10,450 J.
Learn more:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultswhy do garden manure and compost fertilize the soil
gardens arent real the government is lying the world is a simulation
As the soil absorbs manure, nutrients are released. This enriches the soil, which in turn helps the plants. The most important benefit of using manure in the garden is its ability to condition the soil For instance, mixing manure with sandy soils helps to retain moisture levels.
Helppppp I need it ASAP
If there are 100 black beans, 27 brown beans, and 173 white beans in the container, what is the percent composition of the container by bean
Answer:
300
Explanation:
Las legumbres son semillas de plantas grandes, carnosas y coloridas. Los frijoles, los guisantes (arvejas) y las lentejas son todos tipos de legumbres.
cho các chất sau NaO2,Na,NaOH,Na2SO4,Na2SO3,NaCl,AgCl hãy lập thành dãy chuyển hoá , hoàn thành bằng phương tình phản ứng
Answer:
brainless me plss i help you out
Although almost 80% of the atmosphere is made up of nitrogen gas, most living things
don't have the enzymes necessary to use nitrogen directly from the atmosphere. How
we obtain the nitrogen we need to make proteins and DNA if we can't obtain it from
breathing?
Answer:
We don’t have the enzymes necessary to remove nitrogen from the atmosphere; we get our nitrogen from the food we eat. ^^
Although almost 80% of the atmosphere is made up of nitrogen gas, most living things don't have the enzymes necessary to use nitrogen directly from the atmosphere. We obtain the nitrogen we need to make proteins and DNA, if we can't obtain it from breathing we can get it by eating organic plants and animals.
Why is Nitrogen important for humans?Nitrogen is a key element in the nucleic acids DNA and RNA, which are the most important of all biological molecules and crucial for all living things. DNA carries the genetic information, which means the instructions for how to make up a life form.
It is used to make amino acids in our body which in turn make proteins. The human body comprises 3% nitrogen (by mass). It is an essential part of amino acids (makeup proteins), nucleic acids (DNA, RNA), ATP (energy molecule), etc. It is nearly impossible to live without nitrogen.
Therefore, Although almost 80% of the atmosphere is made up of nitrogen gas, most living things don't have the enzymes necessary to use nitrogen directly from the atmosphere. We obtain the nitrogen we need to make proteins and DNA, if we can't obtain it from breathing we can get it by eating organic plants and animals.
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Sharon reads two different articles about avocados. The first article, in a weight-loss magazine, claims that avocados are unhealthy because they are high in fat. The second article, in an annual publication from a doctors’ group, claims that the fat in avocados is a type that is good for the heart.
To assess these claims, which question might Sharon ask?
Which source do avocados come from?
Where are avocados sold?
Is the source an authority on the subject?
How much do avocados cost?
Answer:
The correct anwser would be C
Explanation:
Answer:
The answer is C. Is the source an authority on the subject?
Explanation:
If you have two pistons in a system, which exerts the larger force?
Answer:
The larger piston
Explanation:
(i just took the same test)
Please describe what each of the molecules are doing and why there moving like that.
Help meeeeeeeeeeeeeee
Joshua loads a water balloon into a giant sling shot, pulls it back, and launches the balloon toward a target. The balloon misses the target by 3 feet, so he decides to try again. Which part of the process demonstrates an application of force?
Which statement best describes a physical change?
1 Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.
2 Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.
3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
4 Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.
Answer: 3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same
Explanation:
Physical change mainly physical properties of a substance while the chemical changes remain unchanged. Once there is a change to the chemistry of the substance, this would be classified as a chemical change.
What chemical compound is produced as a result of photosynthesis?
a
Answer: Specifically, plants use energy from sunlight to react carbon dioxide and water to produce sugar (glucose) and oxygen.
Explanation:
What is climate? How does it differ from weather
2. If Ben ran for 15 minutes and went 120 meters, how fast did he run?
Answer:
8m/min
Explanation:
120 m / 15 min = 8 meters per min
Draw the reaction of bromoethyne with 2 molecules of HBr. Name the product(s) and the type of reaction.
PLEASE HELP!!
this maybe can help you
i am sorry if not
Bromo-ethene is a product and it is a electrophilic addition reaction.
What is chemical equation?A chemical equation is a method of representing a symbols and formulas of substance involved in this equation.
For example: zinc metal reacts with dilute sulfuric acid to form zinc sulfate and hydrogen gas.
Types of chemical reactions:
combination reactions decomposition reaction precipitation reaction neutralization reactionElectrophilic addition reaction
In this reaction containing a double or triple bond and this one hour breakdown into 2 π and 2 Sigma bonds.
In this reaction HBr undergoes heterolytic bond fusion the protons bonds with the carbon atom of the Carbon triple bond this result in the formation of carbo cation immediate the bromide iron forms a bond with the carbon cation producing Bromo-Ethene.
CH ≡ CBr + 2HBr → Br-CH=CH₂ (Bromo-ethene)
In these reaction Bromo-ethyne react with hydrogen bromide it form Bromo-ethene.
Bromo-ethene is a product and it is a electrophilic addition reaction.
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Find the number of protons, neutrons, and electrons for hydrogen-1, hydrogen-2, and hydrogen-3 respectively.
Answer:
Protons Neutron Electrons
hydrogen-1 1 0 1
hydrogen-2 1 1 1
hydrogen-3 1 2 1
Explanation:
hydrogen-1, hydrogen-2, and hydrogen-3 are all isotopes.
Isotopes have the same number of protons but a varying number of neutrons. Protons = Electrons.
Mg + 2HCl ---> MgCl2 + H2
How many grams of MgCl2 would result from a reaction involving 24.31 g of Mg?
assumed that all of the initial Mg had reacted, therefore the total amount of Mg had transferred into Mg2+ in MgCl2
Molar mass for Mg is 24.31 g/mole and MgCl2 is 95.21 g/mole
--> nMgCl2= nMg = 24.31 g ÷ 24.31 g/mole = 1 mole
--> so the mass of MgCl2 = 1 mole × 95.21 g/mole = 95.21 g
Use the following image to answer the following questions. A student was performing an experiment using two identical cups made of styrofoam. The student had Cup A holding water at 90℃ and Cup B holding water at 20℃. The student then put an Aluminum Bar into each cup that was touching the water. As time passed, the student noticed that the temperature of the water in Cup A and Cup B began to change. Question:
A. Predict what will happen to the temperature of the water in Cup A and Cup B after 1 hour has passed.
B. Explain and give evidence for what type of heat transfer is occurring between the 2 cups.
Whoever answers my question gets brainliest
Answer:
The water will eventually become the same temature (A)
3. Write balanced ionic equations to show the dissolution of the following compounds in water: a) magnesium chloride
Answer:
MgCl2 + H2O
Explanation:
Occurs between a metal atom and a nonmetal atom.
Options:
Ionic Bond or Covalent Bond?
answer please ASAP???? 50 pointtttsss
pls
Answer:
Whats the question
Explanation:
Answer:
Where is the question?
Explanation:
Anyways hru all? I've been pretty good
for 2.02
Control group: cricket frog population Reminder: The test variable is the item that is changing in this investigation. The outcome variable is the item that you are measuring in this investigation. The control group is the group in the experiment where the factors being tested are not applied. It allows scientists to set a baseline to compare the experimental groups that do have factors applied to them.
Test variable (independent variable):
Outcome variable (dependent variable):
Limiting factor- Food, Pollution, Predators.
Outcome variable (dependent variable): Cricket Frog (population)
Control group: Cricket Frogs in the Florida Everglades without changes in or manipulation of the population.
Which of the following is a true statement?
Growth cycles only happen to reptiles.
Growth cycles happen to all animals.
Growth cycles only happen to birds.
Growth cycles only happen to mammals.
Answer:
its either all animals or only mammals. the thing with all animals is that they do have life cycles but not the same as like say humans or elephants, some are complicated.
how is an inoculating loop or needle sterilized prior to use?
Answer:
it is placed over a bunsen burner to heat up and remove all bacteria
Explanation:
Will give BRAINLY if right
Which response is specific to the presence of pathogens in the body?
inflammation
vaccination
production of antibodies
production of viruses
Answer:
production of antibodies
Answer:
C
Explanation:
The body will start to make antibodies to rid of the "invasion".
So the answer is C
