Chemistry College

John Dalton believed which of the following about atoms?

Atoms are real even though they're invisible.
The atom could be divided into smaller parts.
All atoms of a single substance are identical.
Atoms of different substances differ by weight.

Answers

Answer 1

Atoms of different substances differ by weight. Option D

A) Atoms are real even though they're invisible: Dalton proposed that atoms are fundamental, indivisible particles that make up all matter. While atoms themselves cannot be observed directly, their existence and behavior can be inferred through their effects on matter.

B) The atom could be divided into smaller parts: Initially, Dalton believed that atoms were indivisible and the ultimate building blocks of matter. However, subsequent scientific discoveries, such as the discovery of subatomic particles like protons, neutrons, and electrons, revealed that atoms could be further divided into smaller components.

C) All atoms of a single substance are identical: Dalton postulated that atoms of the same element are identical in size, mass, and chemical properties. According to his atomic theory, different elements are composed of unique atoms, and atoms of the same element are identical to one another.

D) Atoms of different substances differ by weight: Dalton recognized that atoms have different masses and proposed that the differences in atomic weight account for the distinct properties of different elements. He formulated the law of multiple proportions, which states that elements combine in fixed ratios of masses to form compounds.

Option D

For more such questions on Atoms visit:

https://brainly.com/question/6258301

#SPJ8

Related Questions

The composition of a compound is 28.73% K, 1.48% H, 22.76% P, and 47.03% O. The molar mass of the
compound is 136.1 g/mol.
I

Answers

The compound has an empirical formula of [tex]K_2H_2P_2O_8[/tex] and a molecular formula of [tex]K_2HPO_4[/tex].

The given compound has a percent composition of K = 28.73%, H = 1.48%, P = 22.76%, and O = 47.03%. Its molar mass is 136.1 g/mol. To determine its molecular formula, we need to find its empirical formula and calculate its molecular formula from its empirical formula.The empirical formula is the smallest whole number ratio of atoms in a compound. It can be determined by converting the percent composition of the elements into their respective moles and dividing each by the smallest number of moles calculated. The moles of K, H, P, and O in 100 g of the compound are: K = 28.73 g x (1 mol/39.1 g) = 0.734 molH = 1.48 g x (1 mol/1.01 g) = 1.46 molP = 22.76 g x (1 mol/30.97 g) = 0.736 molO = 47.03 g x (1 mol/16.00 g) = 2.94 molDividing each by the smallest number of moles gives the following ratios: K = 0.734/0.734 = 1H = 1.46/0.734 = 2P = 0.736/0.734 = 1.002O = 2.94/0.734 = 4. The empirical formula of the compound is [tex]K_2H_2P_2O_8[/tex]. To calculate the molecular formula, we need to determine the factor by which the empirical formula should be multiplied to obtain the molecular formula. This can be done by comparing the molar mass of the empirical formula to the molar mass of the compound.The molar mass of [tex]K_2H_2P_2O_8[/tex] is: [tex]M(K_2H_2P_2O_8)[/tex] = (2 x 39.1 g/mol) + (2 x 1.01 g/mol) + (2 x 30.97 g/mol) + (8 x 16.00 g/mol) = 276.2 g/mol. The factor by which the empirical formula should be multiplied is: M(molecular formula)/M(empirical formula) = 136.1 g/mol/276.2 g/mol = 0.4935. The molecular formula is obtained by multiplying the empirical formula by this factor: [tex]K_2H_2P_2O_8 * 0.4935 = K_2HPO_4[/tex]. Therefore, the molecular formula of the compound is [tex]K_2HPO_4[/tex].The molecular formula of the given compound having a composition of 28.73% K, 1.48% H, 22.76% P, and 47.03% O with a molar mass of 136.1 g/mol is [tex]K_2HPO_4[/tex]. The empirical formula of the compound is [tex]K_2H_2P_2O_8[/tex]. The compound's molecular formula is calculated by determining the factor by which the empirical formula should be multiplied to obtain the molecular formula. The factor is M(molecular formula)/M(empirical formula) = 136.1 g/mol/276.2 g/mol = 0.4935. The molecular formula of the compound is obtained by multiplying the empirical formula by this factor, resulting in the molecular formula [tex]K_2HPO_4[/tex].

For more questions on empirical formula

https://brainly.com/question/13058832

#SPJ8

The correct question would be as

The composition of a compound is 28.73% K. 1.48% H, 22.76% P, and 47.03% O. The molar mass of the compound is 136.1 g/mol. What is the Molecular Formula of the compound?

[tex]KH_2PO_4\\KH_3PO_4\\K_2H_4P_20_{12}\\K_2H_3PO_6[/tex]

Mention three significant of water in coal fired power station

Answers

Water in coal-fired power stations is used for cooling, steam generation, and pollution control, including capturing sulfur dioxide and cooling exhaust gases. Efficient water recycling helps minimize environmental impact.

Water plays a critical role in coal-fired power stations. The power stations need large quantities of water for a variety of purposes. Water is primarily used to cool the power plant, maintain a safe temperature in the boilers, and also to generate steam. In this context, this answer will discuss three significant uses of water in coal-fired power stations. Significant uses of water in coal-fired power stations1. Cooling: Power stations require water for cooling purposes. When water is used for cooling, it absorbs the heat produced by the combustion process. Cooling towers are responsible for releasing the heated water, which is then reused.2. Steam generation: Water is required to generate steam, which is used to rotate turbines and generate electricity. The water used to generate steam must be treated to prevent the accumulation of harmful minerals, which can damage the power plant.3. Pollution control: Water is utilized to reduce air pollution. Flue gas desulfurization systems utilize water to capture sulfur dioxide from power plants. Water is also used to cool exhaust gases that are produced during combustion.In conclusion, the three significant uses of water in coal-fired power stations include cooling, steam generation, and pollution control. These processes require large amounts of water, which is why coal-fired power stations are often located near water sources. By recycling water, power stations can conserve water and minimize their environmental impact.

For more questions on pollution control

https://brainly.com/question/16452378

#SPJ8

Calculate the mass of wire that reacted to silver nitrate solution Mass being 1.52 of copper before reaction

Answers

The mass of wire that reacted to silver nitrate solution is 5.15 grams.

To calculate the mass of the wire that reacted with silver nitrate solution, we need to consider the stoichiometry of the reaction. The reaction between copper and silver nitrate can be represented by the following equation:

Cu + 2AgNO3 → Cu(NO3)2 + 2Ag

According to the equation, one mole of copper reacts with two moles of silver nitrate to form one mole of copper(II) nitrate and two moles of silver.

Given that the mass of copper before the reaction is 1.52 grams, we can calculate the molar mass of copper using its atomic mass, which is 63.55 grams/mol.

1.52 g of copper is equal to 1.52 g / 63.55 g/mol = 0.0239 moles of copper.

Since the reaction stoichiometry is 1:2 between copper and silver, the moles of copper reacting would be equal to half of the moles of silver formed.

Therefore, the moles of silver formed would be 0.0239 moles x 2 = 0.0478 moles.

To find the mass of silver, we multiply the moles of silver by its molar mass, which is 107.87 grams/mol:

Mass of silver = 0.0478 moles x 107.87 g/mol = 5.15 grams.

Hence, the mass of wire that reacted to silver nitrate solution is 5.15 grams.

For more questions on atomic mass, click on:

https://brainly.com/question/30390726

#SPJ8

I think it is the question:

A copper wire with a mass of 1.52 grams reacted with silver nitrate solution. If the balanced chemical equation and the molar ratio between copper and silver nitrate are provided, how can you determine the mass of wire that reacted?

Other Questions
Using any of the assigned social media articles, discuss whether you think that online communities can substitute for face-to-face communities. What is gained or lost? Do you agree with their points or not? You may use your own personal experience to help answer this question, but make sure that you address at least one of the articles as well. Another thing to think about is...if thousands years from now, all that was left to represent humanity are social networking sites, what would future species think of humans based on these sites? What would they think we are like based on the signs they see on these sites? a) The population of Suffolk County, NY is projected to be 1,534,811 in theyear 2040. In the year 2000, the average per capita water use in Suffolk County was 112gallons per person per day. What is the estimated water use (in million gallons per day) inSuffolk County in 2040 if water conservation efforts reduce per capita water use by 15%compared to the year 2000?b) In the year 2000, Public Water Systems in the State of New York supplied2560 million gallons of water per day to 17.1 million people for both domestic andindustrial use. what is the average per capita sewage flow in New York assuming a returnof 67% of the supply? What is one reason a population's distribution of traits might e perience little to no change over a long period of time? A. A high amount of competition exists in the environment. B. The environment remains relatively stable. C. New abiotic factors are introduced regularly. D. The population has a large amount of genetic variation A solenoid of length L = 36.5 cm and radius R=2.3 cm , has turns density n = 10000 m (number of turns per meter). The solenoid carries a current I = 13.2 A. Calculate the magnitude of the magnetic field on the solenoid axis, at a distance t = 13.5 cm from one of the edges of the solenoid (inside the solenoid). A positive charge of 1.100 C is located in a uniform field of 9.0010 N/C. A negative charge of -0.500 C is brought near enough to the positive charge that the attractive force between the charges just equals the force on the positive charge due to the field. How close are the two charges? Which statement BEST exemplifies a secondary appraisal? "Taking on a double major is just too much work!" "Taking on a double major may help me get into medical school." "If I tutor, I can quit my job as a server and have more time for a double major." "If I take on a double major, I won't be able to see my friends as much." would not have built the platform if it did not expect to make a good profit. What is BP's expected profit when it has pumped all the estimated barrels of crude oil and gas? For determining natural profits assume the platform will produce for 10.9 years (4000 days). You have been asked by the financial vice president to develop a short presentation on thelower-of-cost or market method for inventory purposes. The financial VP needs to explainthis method to the president because it appears that a portion of the company's inventoryhas declined in value. The financial VP asks you to answer the following questions.(i) What is the purpose of the lower-of-cost-or-market method?(ii) What is meant by "net realizable value"?(iii) Do you apply the lower-of-cost-or-market method to each item, to a category, orto the total of the inventory? Explain.(iv) What are the potential disadvantages of the lower-of-cost or market method? Question 1 (5 points) Describe how fertility decreases in middle adulthood in both men and women. Cross-cultural research has shown that societies often engaged in internal warfare tend to be O matrilocal patrilocal O bilocal O neolocal Two-Dimensional Arrays You can use store-+ in Line 16 and use book++ in Line 17. 9{ array declaration 1 // Jenko Booksellers.cpp - displays the total sales //Created/revised by your name> on 3 4 #include 5 #include 6 using namespace std; 7 8 int main() 10 double sales [3] [2] = {{3567.85, 2589.99), 11 (3239.67, 2785.55}, 12 (1530.50, 1445.80}}; 13 double total - 0.0; //accumulator 14 15 //accumulate sales 16 for (int store - 0; store < 3; store +- 1) 17 for (int book = 0; book < 2; book +- 1) 18 total + sales(store] [book]: //end for 20 //end for 21 22 cout John Maynard Keynes: a. was against any form of government intervention b. thought monetary policy should be used to fight recessions, but not fiscal polic c. thought the Federal Reserve should be abolished d. was a supporter of fiscal policy as a means to stabilize the economy If the Federal Government wanted to create a stimulus package to deal with a recession it would include: a. increase in government spending b. decrease in government spending c. increase in taxes d. decrease in interest rates Mike lends money to Kathy as a business loan to Kathy who is capitalizing her start up sole proprietorship named Kathy's What is the pH of a solution of 0. 25M K3PO4, potassium phosphate? GivenKa1 = 7. 5*10^-3Ka2 = 6. 2*10^-8Ka3 = 4. 2*10^-13I know there is another post here with the same question but nobody explained anything. Where does the K3 go? Why does everyone I see solve this just ignore it and go to H3PO4? Question 17 of 23Click to read the passage from "The Perils of Indifference," by Elie Wiesel.Then answer the question.Which of the following evidence from the passage best supports the idea thatpeople have been indifferent to human suffering?OA. Surely it will be judged, and judged severely, in both moral andmetaphysical terms.OB. We are on the threshold of a new century, a new millennium.OC. two World Wars, countless civil wars, the senseless chain ofassassinationsOD. He was finally free, but there was no joy in his heart. asapAll cats are mammals. Richard's cat eats spiders. Therefore, there is at least one mammal who eats spiders. O Unsound Valid O Invalid Weak I need help with this pls SHORT ANSWER: Discuss what happens when there are excess algal blooms in lakes (known as eutrophication). What might be the causes, the chemical reactions associated with such blooms, and the negative effects of this on lakes. Q1: The highly successful online auction site eBay has attracted millions of buyers and sellers. In these faceless exchanges, trust on both sides of a transaction could be of concern. One action eBay has taken to promote trust in exchanges is to allow feedback. Why is this so important and effective?Q2: In 1962, U.S. President John F. Kennedy took specific actions to avoid the pitfalls of groupthink in deciding how to proceed during the Cuban Missile Crisis. Conduct your own research and write a few paragraphs evaluating the steps taken and their effectiveness. Increasing POS reduces bad debts, provides a better cash position, reduces expenses, and increases patient satisfaction when conducted properly. POS is calculated by dividing POS payments by the total patient cash collected. HHS has identified the industry median benchmark for POS as 13.6% and the top 10% POS benchmark as 41.4%. HHSs current POS performance is 35.6%, and the executive team has determined that a 5-percentage point increase is needed to stay competitive (target = 40.6%). A Lean Six Sigma team was formed. POS is a metric that heavily relies on the Patient Access team, or PA. PA is responsible for several taskspatient scheduling, registration, and financial clearance. The "scheduling" tasks are typically completed by a centralized PA team for multiple hospital facilities. During scheduling, PA reps receive a doctors order for a patient. The order is like a permission slip for specific medical services the doctor deems necessary. The doctor or even the patient related to the order can call scheduling to reserve an appointment for the services that correspond to what is written in the order. PA reps need to verify that the order is complete and accurate, coordinate time for services, and provide patients with pre-service instructions. After the patients information is logged into the scheduling system, 3 | P a g e Copyright 2016, Simplilearn, All rights reserved. it will be queued up for the PA registration team to complete the registration process. The PA will call the patient and confirm their identity and collect demographics such as address, family, emergency contact, etc. The patient's health insurance provider(s) will also be confirmed as part of the PA registration process. PA registration can be completed at a hospital facility or by a centralized team. Lastly, PA Financial Clearance will verify patient health benefits to ensure they exist and to determine if the procedure or service for the patient is covered. If authorization is required, the PA Financial Clearance will request authorization for services from the patients health insurance provider. Services performed without authorization lead to rejected claims. Also, during PA Financial Clearance, the PA rep will counsel the patient about their liability (how much their insurance provider says they need to pay for the services) and collect the payment. Any payment received is considered POS since its before 7 days post discharge. Financial clearance can also be performed at the hospital facilities or by a centralized team. Summary patient cash data for HHSs 39 hospital facilities for a year is presented in Table 1. The table also indicates if the PA team for each facility is centralized or not. Table 2 provides an overall monthly trend for POS performance. The team identified the facilities with POS performance above the target and researched the activities they have in place, hoping to find commonalities or key drivers. They are: ensure proper patient education on benefits and liability ask for payment have a financial counseling policy reduce number of patients that leave without financial clearance have accurate tools to help estimate patient liability or responsibility utilize devices that allow patient collections at the patients bedsidePlease solve the following:a) Using the data given in following Table , how would you scope the focus area of the project?b) what could be affinity categories for the key drivers that impact POS performance?