Write the symbols for the following elements:a. oxygen            b. lithium            c. uranium         d. titaniume. hydrogen        f. chromium      g. tin                    h. gold

Q: What is an element composed of?

A: An element is a pure material made up of atoms with the same number of protons in their atomic…

Q: Part A Silver has two naturaly occurring isotopes (Ag-107 and Ag - 109). Use the periodio table to…

A: • We need to determine the atomic mass of silver using the periodic table.

Q: • Part D Based on your answer in Part B, how many neutrons are in this amount of C? Express your…

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Q: In the following drawing, the green spheres represent atoms of a certain element. The purple spheres…

A: The left side of the reaction has one green element and two blue elements because they are of two…

Q: Philosophers and scientists came up with the early ideas of particles. Democritus believed that…

A: Matter is made of small building blocks called atoms.

Q: suggested that everything was made of atoms

A: According to Dalton's atomic theory,  matter is consists of tiny paricles ,called atoms

Q: Part A A pure titanium cube has an edge length of 2.77 in . How many titanium atoms does it contain?…

A: The volume of a cube is defined as the cubic product of the length of one side of the cube. The…

Q: A certain mass of carbon reacts with 455.9 g of oxygen to form carbon dioxide. ________ grams of…

A: According to Law of multiple proportions:     C  + O2 → CO2    ----Eqn 1     C  + 1/2O2 → CO…

Q: Selenium consists of five naturally occurring isotopes: Se, Se. Se, Se, and Se. - Part A None of…

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Q: The firs 20 Periodic table elements description.

A: The first 20 Periodic table elements, atomic numbers and symbols are given below,

Q: Back on planet Earth, elements have different isotopic distributions. The atom Chlorine ( Cl ) has…

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Q: A sample of tryptophan synthesized in the laboratory contains 29.4 g of carbon and 7.12 g of oxygen.…

A: Law of definite proportions indicate that irrespective of source, the amount of substance present in…

Q: 34. Barium Carbonate (s) Barium Oxide (s) + Carbon Dioxide lg) a&b: C: d:

A: Answer:- this question is answered by using the simple concept of writing the balanced chemical…

Q: Consider chlorine, which occurs as a mixture of two isotopes: chlorine-35, with a natural abundance…

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Q: d) The atomic mass of silver is 107.8682 u. Determine the mass density of Ag in g/cm.

A: Given, Atomic mass of silver is 1o7.8682 u Lattice constant = 4.09 Ao  Mass density = ?

Q: Naturally occurring boron is composed of two isotopes. The percent abundance and the mass of each…

A: 6 (B) ANS: Atomic mass=   % abundant x atomic mass +% abundant x atomic mass /100 Atomic mass=  19.9…

Q: 2.5 million atoms of particular element have a mass of 8.33X10^-16 grams. What is this element?

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Q: What is atomicity

A: Atomicity is a term which is used to represent the number of atoms present in any molecule or…

Q: Rank the particles from most to least massive

A: In an atom; The mass of Neutron=1.693×10-27 kgThe mass of Proton=1.673×10-27 kgThe mass of…

Q: Which of the following contains the highest number of atoms? A) 1 mole of helium B) 1 mole of carbon…

A: 1 mole = 6.022×1023 = Avogadro's number Anything which is present in the number of 6.022×1023 is…

Q: The Law of Conservation of Masses is attributed to the scientist:

A: According to the Law of conservation of mass " the total mass remain conserved which means the total…

Q: A 7.08 gsample of copper is contaminated with an additional 0.80 gof zinc. Suppose an atomic mass…

A: To calculate the atomic mass, first it is required to calculate the moles of copper and zinc, which…

Q: Antimony (Sb), has two naturally occurring isotopes: Sb-121 that has a percent abundance of 57.30 %…

A: Given: Antimony (Sb) has two isotopes Sb-121 and Sb-123 Mass of Sb-121 =120.90 amu Percentage…

Q: Which is a compound? A. A piece of pure zinc metal B. A molecule made of nitrogen and oxygen C. An…

A: Compound: A molecule consisting of two different elements is called compound

Q: A sample of alumminum foil contains 7.5*1023 atoms. What is the mass of the foil?

A: Given : Number of aluminium atoms in the foil = 7.5 X 1023

Q: If 17.28 g of a pure element contains 8.545×1022 atoms, what is the element? The element is: (Enter…

A: The mass of the element that contains 6.023 × 1023 atoms is called as the molar mass of the element.…

Q: Summarize the history of thedevelopment of atomic theory,beginning with Dalton

A: Every matter is made up of atoms. The theory we study today took a long time for its discovery. The…

Q: Neutron was discovered by *

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Q: of Protons and Neutrons ir

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Q: On a mission to a newly discovered planet, an astronaut finds gallium abundances of 60.11 % for 69Ga…

A: The mentioned atomic mass is the average atomic mass of gallium.  The equation for calculating the…

Q: 1) C a b The number of lines exhibited by hydrogen(s) a is The number of lines exhibited by…

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Q: 78. Proust's Law   Law of Definite Proportions Law of Multiple Proportions Law of Conservation…

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Q: This picture represents a a. mixture of elements. b. a compound. Oc chemically bonded elements. O d.…

A: 11. An element is a substance that consists of atoms of same kind.They are the pure form of a…

Q: What is the volume of a molybdenum atom in microliters?

A: 1 cm3 = 1 mL  1 mL = 0.001 L  1 mL = 1000 microliters

Q: Ca is 42 Mass =

A:

Q: Summarize the history of the atomic idea?

A: Greek philosophers. Leucippus and Democritus put forward the idea of atoms as far back as the fifth…

Q: A sample of aspirin synthesized in the laboratory contains 26.0 g of carbon and 15.4 g of oxygen. A…

A: Given : 1st sample contains 26 g of carbon and 15.4 g of oxygen. 2nd sample contains 8.16 g of…

Q: Chemical equations must be balanced to satisfy the A) law of definite proportions B) law of multiple…

A: A Balanced chemical reaction happens when The number of different atoms of elements on reactant side…

Q: A 25.0 g sample of sucrose is found to contain 51.4% by mass oxygen. A second sample of sucrose…

A: The above statement is consistent with law of Constant Composition.

Q: The diameter of an iodine atom is 280 (± 5) picometer (pm). Find the volume of one iodine atom in…

A: We know that shape of an atom is spherical. We are given Diameter = 280 pm  Radius = diameter/2 =…

Q: A newly found element, Savannium, is composed of three different isotopes. In every sample, there is…

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Q: A student says,A carbon atom is not the smallest possible amount of carbon, because atoms are built…

A: An atom contains electrons, protons and neutrons. Therefore, a carbon atom is composed of its…

Q: Discuss the assertion between the observed value of atomic mass of lithium and it's true value

A: The mass of the atom is due to the nucleus. And the nucleus contains two sub atomic particles which…

Q: Part A On a mission to a newly discovered planet, an astronaut finds copper abundances of 69.15 %…

A: Given, Abundance of 63Cu = 69.15% Abundance of 65Cu = 30.85% Mass of 63Cu = 62.9300 amu Mass of 65Cu…

Q: An unknown element is determined to have two naturally occurring isotopes. Isotope 1 is 68.11%…

A: Given,Isotope 1 is 68.11% abundant and has a mass of 68.925580 amu, and isotope 2 has a mass of…

Q: 2.A student says,“A carbon atom is not the smallest possible amount of carbon, because atoms are…

A: Atoms are made up of smaller particles like electrons, protons and neutrons. Similarly, a carbon…

Q: SECTION 2: WHY DOES A MOLE HAVE A DIFFERENT MASS? PART A: WATCH THE VIDEO to fill in the blanks and…

A: To fill in the blanks on the information about atom

Q: the atoms listed below, which has the largest mass?   A. all have the same mass B. lead C. uranium…

A: Atoms which have more number of neutrons and protons have greater mass because mass is due to…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.