10. Nitrogen, hydrogen, and ammonia (NH3) are all composed of molecules. What is it about a molecule of ammonia that makes it a compound, whereas hydrogen and nitrogen are elements? A) There are four atoms making up an ammonia molecule. B) The ammonia molecule contains atoms of two different types of elements. C) An ammonia molecule has more than one bond. D) An ammonia molecule has a larger mass than the sum of the masses of its constituent atoms.

10. Nitrogen, hydrogen, and ammonia (NH3) are all composed of molecules. What is it about a molecule of ammonia that makes it a compound, whereas hydrogen and nitrogen are elements? A) There are four atoms making up an ammonia molecule. B) The ammonia molecule contains atoms of two different types of elements. C) An ammonia molecule has more than one bond. D) An ammonia molecule has a larger mass than the sum of the masses of its constituent atoms.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter2: Atoms, Molecules, And Ions

Section: Chapter Questions

Problem 126CP: You have two distinct gaseous compounds made from element X and element Y. The mass percents are as...

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You have two distinct gaseous compounds made from element X and element Y. The mass percents are as follows: Compound I: 30.43% X, 69.57% Y Compound II: 63.64% X, 36.36% Y In their natural standard states, element X and element Y exist as gases. (Monatomic? Diatomic? Triatomic? That is for you to determine.) When you react gas X with gas Y to make the products, you get the following data (all at the same pressure and temperature): 1 volume gas X + 2 volumes gas Y 2 volumes compound I 2 volumes gas X + 1 volume gas Y 2 volumes compound II Assume the simplest possible formulas for reactants and products in the chemical equations above. Then, determine the relative atomic masses of element X and element Y.
hat does temperature measure? Are the molecules in a beaker of warm water moving at the same speed as the molecules in a beaker of cold water? Explain? What is heat? Is heat the same as temperature?
Copper: (a) Suppose you have a cube of copper metal that is 0.236 cm on a side with a mass of 0.1206 g. If you know that each copper atom (radius = 128 pm) has a mass of 1.055 1022 g (you will learn in Chapter 2 how to find the mass of one atom), how many atoms are there in this cube? What fraction of the cube is filled with atoms? (Or conversely, how much of the lattice is empty space?) Why is there empty space in the lattice? (b) Now look at the smallest, repeating unit of the crystal lattice of copper. Knowing that an edge of this cube is 361.47 pm and the density of copper is 8.960 g/cm3, calculate the number of copper atoms in this smallest, repeating unit.
Marie Curie was born in Poland but studied and carried out her research in Paris. In 1903, she shared the Nobel Prize in Physics with H. Becquerel and her husband Pierre for their discovery of radioactivity. (In 1911 she received the Nobel Prize in Chemistry for the discovery of two new chemical elements, radium and polonium, the latter named for her homeland, Poland.) They and others observed that a radioactive substance could emit three types of radiation: alpha (), beta (), and gamma (). If the radiation from a radioactive source is passed between electrically charged plates, some particles are attached to the positive plate, some to the negative plate, and others feel no attraction. Which particles are positively charged, which are negatively charged, and which have no charge? Of the two charged particles, which has the most mass? Radioactivity. Alpha (), beta I(), and gamma () rays from a radioactive element are separated by passing them between electrically charged plates.
A mixture contains the following five pure substances: Cl2, C2Cl6, H2CO3, H2SO4, and HC1. a. How many different kinds of diatomic molecules arepresent in the mixture? b. How many different kinds of atoms are present in themixture? c. How many total atoms are in a mixture samplecontaining four molecules of each component? d. How many total carbon atoms are present in a mixturesample containing three molecules of each component?
You have two distinct gaseous compounds made from element X and element Y.The mass percents are as follows: Compound I: 30.43% X, 69.57% Y Compound II: 63.64% X, 36.36% Y In their natural standard states, element X and element Y exist as gases. (Monatomic? Diatomic? Triatomic? That is for you to determine.) When you react "gas X" with "gas Y" to make the products, you get the following data (all at the same pressure and temperature): 1 volume "gas X" + 2 volumes "gas Y" → 2 volumes compound I 2 volumes "gas X" + 1 volume "gas Y" → 2 volumes compound II Assume the simplest possible formulas for reactants and products in the chemical equations above. Then, determine the relative atomic masses of element X and element Y.
A steel tank of helium gas has been used to fill several party balloons. At the molecular level, how would the helium atoms be affected if you put the balloons in the trunk of your car on a hot summer day?Choose one or more: A.The helium atoms in the balloon would move closer together. B.The helium atoms in the balloon would move further apart. C.There would be no effect on the helium atoms in the balloon. D.The helium atoms in the balloon would move slower. E.The helium atoms in the balloon would move faster.
A steel tank of helium gas has been used to fill several party balloons. At the molecular level, how would the helium atoms be affected if you put the balloons in the trunk of your car on a hot summer day?Choose one or more: A.The helium atoms in the balloon would move faster. B.The helium atoms in the balloon would move further apart. C.The helium atoms in the balloon would move closer together. D.There would be no effect on the helium atoms in the balloon. E.The helium atoms in the balloon would move slower.
7. What do you mean by “aliquot” and “dilution”?
JJ Thomson is credited with the discovery of
what is barye unit ? What is its definition? what is its history? explain complitly with barye history and physics
1. Marie Curie was a Polish scientist that specialized in chemistry and physics. She wanted to understand how X-rays worked and noticed in her studies that the element, Uranium, gave off rays that could be measured but did not know what the rays were. She assumed that the rays came from the uranium itself instead of through different molecules interacting with each other. To study the rays, she used an instrument, called an electrometer, that studied the electricity that the rays passed through the air. Through this she was able to discover that the more uranium atoms there were in a compound, the stronger the rays that came off of it. She used this discovery to test other minerals that emitted more rays than Uranium, and discovered the elements Thorium, Polonium and Radium. Through her discoveries of these elements, scientists were able to find the structure of the atom and even how the rays can be used to fight cancer. What was Marie Curie’s observation? 2. What was Marie Curie's…