One mole of silicon (6 x 1023 atoms) has a mass of 28 grams, as shown in the periodic table on the inside front cover of the textbook. The density of silicon is 2.4 grams/cm3. What is the approximate diameter of a silicon atom (length of a bond) in a solid block of the material? Make the simplifying assumption that the atoms are arranged in a "cubic" array, as shown in the figure. Remember to convert to Sl units. Ma Qu Mu d = 2.687

Q: Should the elemental symbol for lead be written as Pb or PB? What confusion could arise if the wrong…

A: Elemental symbol for lead is Pb and it should be Pb .

Q: In the table below, there are descriptions of an experiment on samples of three different chemical…

A: Given that : We have to identify whether the elements are metal or non-metal form the given…

Q: In Section 1.10, it was stated that 1 mol of sand grains would cover the state of Texas to several…

A: SOLUTION: Step 1: Simple Volume of 1 sand grain = (0.10 mm)3 = 0.001 mm3. 1 mole of sand =…

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: The changes are as follows according to the given microscopic structure.

Q: We experimented on various elements: Mossy Zinc, Aluminum Turnings, Copper Turnings, Activated…

A:

Q: Change 1 Change 2 Change 3 Change 1 is: Change 2 is: Change 3 is: impossible impossible impossible a…

A: Applying definition of physical and chemical changes. A change which provides new matter is chemical…

Q: Give the correct formulas for the following compounds. If you do not know how to use subscripts for…

A: A)  MP B) M3(PO4)4 C) M3(PO3)2 D) MHSO4

Q: Calculate the surface area in nm^2 of water contained in a watch glass with a diameter of 9.0cm. The…

A: Given,Diameter = 9.0 cm

Q: 2. Which of the following statements is accurate? Explain. "The mass of the student is 56 kg." The…

A: Interpretation -  We have to explain that which statement is correct - "The mass of the student is…

Q: The radius of a lead atom is 175 pm. How many lead atoms would have to be laid side by side to span…

A: Given: Radius of each lead atom = 175 pm = 175 X 10-12 m                          (Since 1 m = 1012…

Q: Take the mass measurement with nitrogen (28 dalton or atomic mass units per molecule) and the mass…

A:

Q: What are the chemical symbols for antimony, arsenic, aluminum, boron, gallium, germanium, indium,…

A:

Q: Why is it important to be aware of the ingredients of the food you eat? Is fish good for your…

A: To grasp: Knowledge of foods we eat and characteristics of elements present in it

Q: The radius of a lead atom is 175 pm. How many lead atoms would have to be laid side by side to span…

A: Initially we need to convert Picometer to Millimeter.

Q: The mass of a single vanadium atom is 8.46×10-23 grams. How many vanadium atoms would there be in a…

A: Density is the physical quantity that relates mass of a substance with its volume.Mathematically,…

Q: Which part of the description of a compound or element refers to its physical properties and which…

A: Physical property: Physical property of an element or compound includes chemical composition,…

Q: At first, it seemed like the poisoned Russian agent might have ingested thallium in the form of…

A: the minimum amount of thallium to kill an average adult= 8*102 mg concentration= 0.45m conc = no of…

Q: a) If sea water contains 3.5% NaCl, by mass, how many grams of NaCl can be obtained from 1.00 gallon…

A: Density of sea water = 1.02 g/mL

Q: The fact that the C atom can form compounds like CH4, C2H5O, H2C=CH2, HC≡CH, etc., demonstrates…

A: To find: The fact that the C atom can form compounds like CH4, C2H5O, H2C=CH2, HC≡CH, etc.,…

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: Answer:- This question is answered by using the simple concept of physical change and the chemical…

Q: An atom of rhodium (Rh) has a diameter of about  2.7×10−8cm2.7×10−8cm   If the atom is assumed to…

A: The diameter of the rhodium atom is = 2.7×10-8 cm The volume of rhodium atom in m3 is =?

Q: The salt used to melt snow on a walkway outside a house is calcium calcium chloride and is sold in…

A:

Q: The radius of a aluminum atom is 143 pm. How many aluminum atoms would have to be laid side by side…

A: Given : Radius of Aluminium atom = 143 pm And length of line to be made = 4.38 mm  Since 1 pm =…

Q: Sample of Substance X Change 1 Change 2 Change 3 Change 1 is: Change 2 is: Change 3 is: O impossible…

A: Physical changes are those changes in which only Physical state of matter change, while their…

Q: Why was it necessary for separation techniques and methodsof chemical analysis to be developed…

A: Law of definite composition states that the composition of a particular compound is the same no…

Q: One mole of gallium (61023 atoms) has a mass of 70 grams, as shown in the periodic table on the…

A: Introduction: Introduction: The density will be the same for one atom and a large part of the…

Q: What is the relationship between calculating the amount of iron in a vitamin pill and physical…

A: The analysis of present iron in a supplement tablet can be done by a redox titration reaction. Iron…

Q: 2. What measurements might you record regarding water samples to assist with the quantification…

A: Q2)  The analysis of water samples are done to know the water quality of the water.

Q: Determine the empirical formula for a compound that contains 34.1 % nitrogen by mass and 65.9 %…

A: The question is based on the concept of elemental analysis. we have to calculate empirical formula…

Q: For each of the following elements, write its chemical symbol,locate it in the periodic table, give…

A:

Q: For each of the following elements, write its chemical symbol,determine the name of the group to…

A: Given: Five elements, (a) Potassium (b) Iodine (c) Magnesium (d) Argon (e) Sulfur

Q: Archimedes tells us the lifting power of a balloon (how much mass it can lift) is equal to the…

A:

Q: How many neon atoms are contained in (6.89x10^2) grams of neon? Use at least two decimal places for…

A: Given -> Weight of neon = 6.89 × 102 gram

Q: What is the symbol for the element that is in group VIIA(17) and period 3?   What is the symbol…

A:

Q: What is the mass, in grams, of exactly 230 sodium atoms? Would it be the same answer only in grams?…

A: Steps to convert atoms to grams • Convert atoms to moles - Divide the number of atoms with Avogadro…

Q: Although carbon-12 is now used as the standard for atomic weights, this has not always been the…

A: The atomic weights of H and O are 1.00794 g and 15.9994 g respectively. Weights of atoms are…

Q: 3) Na is present in seawater as 1.25 g Na/kg seawater. What volume of seawater as in liters(L),…

A:

Q: Part F The compound iron chloride can exist with either iron(II) ions or iron(IIl) ions. Conduct…

A:

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A: Chemical change: The process in which the molecular composition is completely changed, and a new…

Q: A pure sample of compound X contains only carbon and oxygen in a mass ratio of 0.750 g C : 1.00 g O.…

A: A pure sample of compound X contains only carbon and oxygen in a mass ratio of 0.750 g C: 1.00 g O.…

Q: Sample of Substance X Change 1 Change 2 Change 3 Change 1 is: Change 2 is: Change 3 is: O impossible…

A: Physical change is defined as the one in which the form/state of the particle changes but their…

Q: Volume occupied by electrons Nucleus Part A containing protons and neutrons- What is the approximate…

A: The diagram given is,

Q: 1.28 x 1023 molecules of C10H22 would have what number of carbon atoms? 6.

A:

Q: Marie Curie was a Polish scientist that specialized in chemistry and physics. She wanted to…

A: Marie Curie  Marie Curie is renowned for discovering radium and polonium, as well as for making a…

Q: There are four sketches below. The first sketch shows a sample of Substance X. The three sketches…

A:

Q: What are advantages and limitations of different types of modelling? (modelling with experiments,…

A: In chemistry there are many ways to check the deviation of experimental data from the accurate…

Q: The distance between two atoms was determined to be 11.4 nm. What is this distance in centimetres?…

A: Distance is measured in different units. For example nanometre (nm), picometre (pm), centimetre…

Q: Archimedes tells us the lifting power of a balloon (how much mass it can lift) is equal to the…

A: According to Archemedes principle,  Mass carried out by a balloon = (mass of air displaced by…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.