How did Dalton explain the formation of compounds?
A) Atoms divide into smaller parts.
B) Atoms chemically combine.
C) Mixtures of atoms are formed.
D) Copies of atoms are made
Answers
Dalton explained the formation of compounds by Atoms chemically combine. Option B is correct.
According to the Dalton's atomic theory, atoms are indivisible and they will combine in fixed ratios to form a compounds. He proposed that elements will consist of tiny, indivisible particles termed as atoms that will combine in simple, whole-number ratios to form a compounds.
He believed that atoms of different elements combine in the fixed ratios to form compounds, and that the ratio of their masses determines the ratio of their combining atoms.
Thus, Dalton explained that the formation of the compounds can occurs through a chemical combination of atoms, rather than through the division or copying of atoms.
Hence, B. is the correct option.
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Related Questions
what should i do if there is more than 1 curve on a graph
Answers
Answer:
Image result for what should i do if there is more than 1 curve on a graph
In a multiple line graph, there are two or more lines in the graph connecting two or more sets of data points. The independent variable is listed along the horizontal, or x, axis and the quantity or value of the data is listed along the vertical, or y, axis. Lastly, the legend, or key, states what each line represents.
Explanation:
Denise wants to know which time of day is the warmest. She creates a chart to record the time and temperature at various times over several days. Which of the following best describes why Denise should keep detailed notes from her experiment?
to prevent others from doing the same investigation
to prevent others from making mistakes when doing the investigation
to allow someone to practice note-taking skills when doing science investigations
to allow someone to do the same investigation and check the accuracy of results
Answers
Denise ought to keep detailed record of the experiment to allow someone to do the same investigation and check the accuracy of results. Option D
What is an experiment?The term experiment has to do with cause and effect relationships. We know that the cause is what leads to the effect if the process can be tested in a laboratory. The experiment that as performed by Denise was targeted at finding what time of the day is warmest.
From the results of the experiment, we can conclude that Denise ought to keep detailed record of the experiment to allow someone to do the same investigation and check the accuracy of results.
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How is Petroleum extracted? How do humans use it? What are the benefits?
Answers
homogeneous mixtures have ________ distribution.
Answers
Explanation: a homogeneous mixture forms when two or more substances are combined to make something uniform. In this type of mixture, the components must be evenly distributed troughout. Only one state of matter can be present and you can see individual ingredients.
A potential energy diagram is shown
What is the total change in enthalpy of this reaction?
Answers
we know that,
AᵣH = (Sum of enthalpies of products)-(Sum of enthalpies of reactants)
AᵣH = 55kJ - 30 kJ
AᵣH = 25kJ
or
AᵣH =( Activation Energy-Reactant energy) +( Activation Energy-product energy)
AᵣH =(65kJ -30kJ) +(65kJ-55kJ)
Since there's a degrade , we'll consider the PE of product as -veAᵣH = 35kJ - 10kJ
AᵣH = 25kJ
Answer:
B. 25 kj
Explanation:
Products-reactants
I took the exam
According to the Law of Conservation of Matter _______.
a. No atoms are created or destroyed whenever matter undergoes a physical change but can when matter undergoes a chemical change.
b. Atoms are created but not destroyed whenever matter undergoes a physical or chemical change.
c. Atoms are destroyed but not created whenever matter undergoes a physical or chemical change Some atoms are created or destroyed whenever matter undergoes a physical or chemical change.
d. No atoms are created or destroyed whenever matter undergoes a physical or chemical change.
Answers
Answer:
A.
Explanation:
Matter is neither created nor destroyed unless it is acted upon by a chemical force/change.
Name the following compounds or list their formula
1) Dinitrogen tetra oxide
2) Carbon Monoxide
3) SiF4
4) SO2
Answers
2)CO
3) silicon tetrafluoride
4)sulfur dioxide
The “tetra”(meaning 4) and “mono”(meaning 1) are to represent the number of a given element present in the compound ( the prefix system) :)
Using the equation: 3 NO2(g)H2O-->2 HNO3(aq)+ NO (g)If you start with 10.0 g of NO2(g) and 30.0 g of H2O0):a. What is the limiting reagent for this reaction?b. How many grams of nitric acid can be produced? (theoretical yield)
Answers
Answer:
a. The limiting reagent is NO2.
b. 126g of nitric acid can be produced.
Explanation:
1st) It is necessary to write the balanced equation:
\(3NO_2+H_2O\text{ }\rightarrow2HNO_3\text{ + NO}\)From the balanced equation we know that 3 moles of NO2 (3x46g= 138g) react with 1 mol of water (18g/mol) to produce 2 moles of nitric acid (2x63g= 126g) and 1 mol of NO (30g/mol).
2nd) To calculate the limiting reagent it is necessary to use the given values and the stoichiometry of the balanced equation:
\(\begin{gathered} 138gNO_2-18gH_2O \\ 10.0gNO_2-x=\frac{10.0gNO_2\cdot18gH_2O}{138gNO_2} \\ x=1.30gH_2O \end{gathered}\)The 10.0g of NO2 will need 1.30g of H2O to react.
\(\begin{gathered} 18gH_2O-138gNO_2 \\ 30.0gH_2O-x=\frac{30.0gH_2O\cdot138gNO_2}{18gH_2O} \\ x=230gNO_2 \end{gathered}\)The 30.0g of H2O will need 230g of NO2 to react.
So, as we only have 10.0g of NO2 and 30.0g of H2O, the limiting reagent will be NO2.
3rd) Now, to calculate the theorical yield, we need to use the stoichiometry of the balanced equation using the limiting reagent:
1 mol of H2O produces 2 moles of nitric acid. With the molar mass of nitric acid (63g/mol), we can calculate the grams.
\(2\text{moles}\cdot(\frac{63g}{1\text{mol}})=126g\)
Finally, 126g of nitric acid will be produced if the reaction is 100% efficient (theoretical yield).
What role does respiration play in the cycling of carbon?
Answers
Which of the following is true about amplitude?
A. The smaller the amplitude, the greater the energy that is carried by the wave.
B. The larger the amplitude, the less the energy that is carried by the wave.
C. The larger the amplitude, the more the energy that is carried by the wave. 72
Answers
Answer:
C.
Explanation:
The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. ... As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder. Relative sound intensities are often given in units named decibels (dB).
The correct statement about the amplitude of a wave is option C. Thus, the larger the amplitude, the more the energy that is carried by the wave.
What is amplitude?Amplitude of a wave is a parameter describing the intensity of the wave. Amplitude of a transverse wave and sinusoidal waves are measured as the distance between from the central point of a crest to its top or the the distance from the central point of the trough in the line to its bottom part.
The amplitude of a wave is directly proportional to the frequency of the wave and the frequency in turn is directly proportional to the energy of the wave.
Therefore, The correct statement about the amplitude of a wave is option C. Thus, the larger the amplitude, the more the energy that is carried by the wave.
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the rate at which hemoglobin is synthesized depends on availability of which substance?
Answers
The rate at which hemoglobin is synthesized depends on the availability of: iron.
Hemoglobin is a protein molecule found in red blood cells responsible for transporting oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs.
Hemoglobin contains iron, which is essential for its function. The iron binds to oxygen in the lungs and releases it in the tissues.
Therefore, iron is necessary for the synthesis of hemoglobin. Without sufficient iron, the body cannot produce enough hemoglobin to meet the oxygen-carrying demands of the tissues.
Iron deficiency can lead to anemia, a condition characterized by a decrease in the number of red blood cells and a decrease in hemoglobin levels.
Iron is obtained from the diet and is absorbed in the small intestine. A diet low in iron or conditions that impair iron absorption can lead to iron deficiency and anemia.
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Write the equation for the beta decay of Beryllium-10. (Beryllium is element number 4)
Answers
\(^{10}_{4} \text{Be} \longrightarrow ^{0}_{-1} \beta+^{10}_{5} \text{B}\)
How much oxygen will contain the same number of atoms as the number of molecules in 73 g of HCI?
Answers
Answer:
64g of O2.
Explanation:
We'll begin by calculating the number of molecules in 73g if HCl.
This is illustrated below:
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules. This implies that 1 mole of HCl also contains 6.02×10²³ molecules
1 mole of HCl = 1 + 35.5 = 36.5g
Thus, if 36.5g of HCl contains 6.02×10²³ molecules, then 73g of HCl will contain = (73 x 6.02×10²³)/36.5 = 1.204×10²⁴ molecules.
Therefore, 73g of HCl will contains 1.204×10²⁴ molecules.
Now, we shall determine the mass of oxygen that will contain 1.204×10²⁴ molecules.
This can be obtained as follow:
1 mole of O2 = 16x2 = 32g
32g of O2 contains 6.02×10²³ molecules.
Therefore, Xg of O2 will contain 1.204×10²⁴ molecules i.e
Xg of O2 = (32 x 1.204×10²⁴)/6.02×10²³
Xg of O2 = 64g
Therefore, 64g of O2 will contain the same number of molecules (i.e 1.204×10²⁴ molecules) in 73g of HCl.
How much of the water (in ml ) contains 150 mg of pb ? (assume a density of 1.0 g/ml .)
Answers
There are 0.15 ml of the water contains 150 mg of Pb .
Calculation ,
Formula used :
density = mass / volume ( i )
Given mass of the Pb in milligram ( mg ) = 150 mg
Given mass of the Pb in gram ( g ) = 150 × \(10^{-3}\) = 0.15 gram
Given density = 1.0 g/ml
We have to find volume of water in milliliter ( ml ) .
Putting the value of mass of the Pb , lead and density in equation ( i ) we get the volume of water in milliliter ( ml ) .
density = mass / volume
1.0 g/ml = 0.15 gram / volume
volume = 0.15 gram / 1.0 g/ml = 0.15 ml
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Please help me thank you! Stay safe
Answers
Answer:
number 3
Explanation:
Explanation:
it's the third graph
values are put directly without scaling
what is the mass percent of water in plaster of paris
Answers
Answer: 18.5%
Explanation:
Use the References to access important values if needed for this question. Classify each of the following as either a pure substance a homogeneous mixture or a heterogeneous mixture: polyethylene bird seed tap wateir Note: for examples that could refer to either a pure compound or a commercial product, consider the pure compound.
Answers
A pure substance is one that cannot change state or divide into other substances, except for a chemical reaction.
Classify these substances? In chemistry and related fields, a mixture refers to a substance that is composed of two or more substances. This is the opposite of a pure substance that has not been combined with others. In the case of the vegetable soup, this is a mixture because it integrates multiple substances such as water, salt, vegetables, etc.On the other hand, a mixture is classified as homogeneous if the elements are completely integrated, and the final substance is uniform or as heterogeneous if the mixture is not uniform. In the case of the soup, this can be classified as a heterogeneous mixture because in most cases you can identify the elements in it such as pieces of vegetables and therefore it is not a uniform or homogeneous mixture.N2, Nitrogen is known as the chemical element that is characterized by having atomic number 7 and that is symbolized by the letter N, in its molecular version, it is recognized as N2.To learn more about substance refer to;
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.
Question 2 of 10. What is Diffusion?
Answers
Answer:
diffusion: the movement of molecules in a solution from an area of
higher concentration to an area of lower concentration
Diffusion is the movement of particles from where there are more to where there are less. This movement occurs until particles are evenly spread out. While diffusion can be seen in all states of matter, it is most common in liquids and gases.
While watching a popular space-based science fiction movie, space
vehicles loudly shoot each other with lasers and explode with a booming
sound. Students of science know that sound does not travel through
space and these movie scenes showing space sounds are factually
incorrect. Why are there no sounds in space?
Answers
Answer:
Sound waves required a medium.
Explanation:
In space, there is only vacuum hence no any medium for sound wave travel.
Since sound waves are mechanical waves, they require a material medium such as air, hence no sound transmission.
Answer: There is no air.
Explanation:
Because there is no air in space, there is no way for air to travel in space.
Air needs to push on your eardrums or air in general to move through space when there is no air your eardrums won’t move from the air making it quiet.
what is the entropy of this collection of training examples with respect to the target function classification?
Answers
Deciding whether or not to approve a mortgage Future changes in consumer purchase tendencies can be predicted using classification models.
A mortgage is a kind of loan used to buy or keep up real estate, such as a home, piece of land, or other construction. The borrower agrees to make a series of monthly payments, divided into principal and interest, to the mortgage lender. This frequently emerges as a succession of regular, weekly episodes. After then, the asset is forfeited as loan collateral.
Borrowers are need to fill out an application with their selected lender and fulfill a number of criteria, such as down payments and minimum credit scores. Before going on to the closing stage, mortgage applications must pass a stringent underwriting procedure.
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Match each lab incident to the item of PPE that will protect you from it. Each item of PPE will only be used once.
While picking up a buret, an unknown solution left by a previous solution drips onto your hand._______________
While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor _______
While checking on a stirring solution, the solution splashes up towards your face. _______
While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench, __________
A. Gloves
B. Lab coat
C. Goggles
D. Closed-toe shoes
Answers
While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves
While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes
While checking on a stirring solution, the solution splashes up towards your face - Goggles
While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat
Explanation:
The full form of PPE is 'Personal Protective Equipment'.The PPE items we use in labs are : Lab coat: Protection of clothing and skin from accidental spilling of hot liquid or toxic substances. Gloves: Protection from hands from chemicals, hot objects, sharp tools, or electricityGoggles: Protection of the eye from any chemicals, toxic vapor, chemical debrisFace shield: Protection of the face from any chemicals, toxic vapor, chemical debrisClosed-toe shoes: Protection from feet from chemicals, hot objects, sharp tools, or electricitySo, according to the question. the matches will be:
While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves
While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes
While checking on a stirring solution, the solution splashes up towards your face - Goggles
While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat
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Read the following paragraph from the section "Plasma.""
Answers
Answer:
I read, but what do I do now (what was the question)?
Answer: the question isn't listed
Explanation:
four aluminum samples are each reacted with separate 1m copper sulfate solutions under the same conditions of temperature and pressure. which aluminum sample would react most rapidly
Answers
Four aluminum samples are each reacted with separate 1m copper sulfate solutions under the same conditions of temperature and pressure.So all aluminum sample will react with same rate.
The following factors affect rate of reaction.
concentration of reactants, Pressure, Temperature, Catalyst, Nature of reactants, exposure of reacting species, Surface area, Intensity of light.
If all sample of aluminum are reacted with copper sulfate solution under same conditions, then all samples will react with same rate.
In general, adding the attention of a reactant in result, adding the face area of a solid reactant, and adding the temperature of the response system will all increase the rate of a response. A response can also be sped up by adding a catalyst to the response admixture.
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Which shows two structures that are made mostly of metal?
Answers
Answer:
The bell and the Eiffel tower
What is the name of the positively charged particle in the nucleus of an atom?
Answers
Protons are the positively charged particles in the nucleus of an atom.
What is an atom?
A particle of matter uniquely defining a chemical element is called an atom.
Atoms consist of central nucleus surrounded by one or more electrons that are negatively charged. The nucleus itself is positively charged, containing one or more heavy particles called neutrons and protons.
Hydrogen and neon are good examples of atoms.
Atoms have an electric charge of zero, i.e. neutral.
They are indivisible particles, capable of being neither created nor destroyed in chemical reactions.
Therefore, a proton is the positively charged particle in the nucleus of an atom.
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what is the volume of 0.4 mole of gas at stp? 30 points!
Answers
Answer:
89.6 liters
Explanation:
A STP (standard temperature and pressure) ONE mole of any idea gas will occupies 22.4 liters. So,...
4 moles x 22.4 L/mol = 89.6 liters
8.96 L is the answer
In 20 moles of copper (II) phosphate, there are _____ moles of copper ions and _____ moles of oxygen atoms.
(a) 20, 60
(b) 20, 80
(c) 40, 80
(d) 60, 120
(e) 60, 160
Answers
The answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.
The formula for copper(II) phosphate is Cu3(PO4)2.
To find the number of moles of copper ions in 20 moles of copper (II) phosphate, we must first find the number of moles of copper in one mole of copper (II) phosphate.
We have 3 moles of copper in one mole of copper (II) phosphate.
Therefore, we have:3 x 20 = 60 moles of copper ions
To find the number of moles of oxygen atoms in 20 moles of copper (II) phosphate, we first need to find the total number of oxygen atoms in 20 moles of copper (II) phosphate.
In one mole of copper (II) phosphate, there are 8 oxygen atoms (2 from each phosphate ion).
We have:8 x 20 = 160 oxygen atoms.
So, the answer is (e) 60, 160: there are 60 moles of copper ions and 160 moles of oxygen atoms in 20 moles of copper (II) phosphate.
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Two trains, A and B are moving at a speed of 20 km per hour
and 30 km per hour respectively. Which type of energy do
these two trains have?
Answers
Answer:
\(\fbox {kinetic motion}\)
Explanation:
As the trains are clearly in motion, we can understand the these trains possess kinetic energy, which is by virtue of a motion of a body.
Answer:
type of energy that two train have are kinetic energy
A reaction produces 88. 5 mol H2. What would the volume of this much Hą be at STP? 2 points Vour answer
Answers
A process yields 88. 5 mol H2. 88.5 moles of H2 at STP have a volume of 24,564.8 L (24.564 m3). A system's volume is a crucial and detailed parameter for defining its thermodynamic state.
The Ideal Gas Law, which says that PV = nRT, may be used to determine the volume of a gas at standard temperature and pressure (STP), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. The temperature and pressure are both equal to 1 atm at STP (273.15 K).
Therefore, we can apply the following calculation to get the volume of 88.5 moles of H2 at STP:
V = nRT / P
V is equal to (88.5 mol) x (8.314 J/mol K) x (273.15 K) /. (1 atm)
V = 24,564.8 L
Therefore, at STP, 88.5 moles of H2 have a volume of 24,564.8 L (24.564 m3).
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What is the specific heat of a substance if 60.0 J are required to increase the temperature of 6 grams
by 11 degrees Celsius?
What is a likely identity of this substance?
Answers
q = mc ∆ t
60.0 J = (6g)(x)(11*C)
x = 0.9 J/g*C
Aluminum