Which of the following compounds would you expect to have the lowest melting point? CaO H2O Na2O LiCl NaH

Q: Which of the following compounds is likely to have the lowest melting point? NaCl CS2 Pb…

A: Melting point: The temperature at which a solid substance melts to achieve liquid state. Melting…

Q: Which type of compound is used to color glass? OBases OPolymers O Alloys Metal oxides Acids

A: Glass is coloured when metal oxides or metal powders are added to molten glass. The colour of glass…

Q: Why does sodium fluoride have a melting point of 993°C but nitrogen has a melting point of -210°C?

A: Please find your solution below : Melting point of any substance is defined as the temperature at…

Q: solution? A) AuCu    B) CaCl2    C) NF3    D) SiC A solid is tested for malleability, electrical…

A: 01. Calcium chloride (CaCl2) is a brittle solid crystalline substance that dissolves in water to…

Q: Differentiate between calcium carbonate and calcium oxalate crystals.

A: Both calcium carbonate and calcium oxalate are alkaline earth metal salts.

Q: a. vanadium(V) fluoride b. stannic oxide c. silicon tetrafluoride mercuric oxide

A: Write formula of the given compound---

Q: The density of a metal is 8.92 g/cm3. The metal crystalizes into FCC structure. If the atomic radius…

A: Given  Density of metal ( d ) = 8.92 g/cm3 Crystal type = FCC lattice  atomic radius of metal ( r )…

Q: Using the evidence above, list the chemical and physical properties of Phosphorous. Physical…

A: The long form of periodic table is the arrangement of all elements in the increasing order of their…

Q: Chromium, a transition metal used in chromeplating, forms both the C r 2+ and C r 3+ ions. Write…

A: Chromium, a transition metal used in chrome plating, forms both the Cr2+ and Cr3+ ions. Write the…

Q: At room temperature, one of these compounds is a solid and one is a liquid: SiO, or PBr3.

A:

Q: What type of bonding do metalloids generally do to form crystal structures? Covalent lonic O…

A: Covalent bonding is the main bonding to form the crystal structures of the metalloids. In this case…

Q: Explain the factors determine the melting point of a compound ?

A: The temperature at which a solid converts its state to liquid at atmospheric pressure is called the…

Q: Which may form +1 or +3 ions, depending on the conditions? A) gold  B) postassium C) silicon

A: Transition metal placed between s-block and p-block elements and they are termed as d block…

Q: How many sig figs in this number? 1.50 x 10 5 O 1 O 2 O 3 O 4 O 5 6 0 7 O 8

A: Given number is :  1.50 x 10-5  Number of significant figures in 1.50 x 10-5 = ?

Q: The oxidation state of selenium in NaSeO3 is O-5 O-3 O+5 O +7 +3

A: Oxidation state :-  The number of electrons an atom either gains or lost during the formation of a…

Q: Consider this list of substances: H2O, Na, NaOH, CH4. Match these substances with the properties…

A: To match: the properties of the given substances.

Q: Which of the following observations give evidence that a crystal is a hydrate? One or more answers…

A: Solutions- Crystals are hydrated because water molecule in present inside the crystal.

Q: 1. HBr 2. МеОН, н* O. 3. MеР(ОE()2 4. Нао"

A: The product formed in the given reaction is, The first step is the hydrolysis of given substrate…

Q: Provide the correct formula for lead(IV) hypobromite

A: formula are written by using the fact that the oxidation number of cation and anion are cross…

Q: Select basic oxide from the choices given. Choose one    H2O2   CO2   SiO2   P4O6   CaO

A: Basic oxides also called base anhydride, are usually formed by reacting of oxygen with metals. A…

Q: Write the empirical formula for at least four ionic compounds that could be formed fromt 3+ NH, Fe,…

A: The empirical formula of a chemical compound could be defined as the simplest whole number ratio of…

Q: 2. Explain the shape of diamond and explain why it's such a strong crystal.

A: Diamond is the hardest substance on Earth and it is used in making tools for grinding, cutting,…

Q: Why is Cl2 a gas, Br2 a liquid, and I2 a solid at room temperature?

A: In non-polar molecules, London dispersion forces occurs. These types of forces are directly…

Q: Equivalent weight of Al(OH); is O 39 O 62 O 78 O 26

A:

Q: What is the ratio of N2 to NH3 according to this chemical equation ? 3/1 2/1 1/2 1/1

A: Nitrogen reacts with hydrogen to form ammonia. The equation for the balanced chemical reaction is…

Q: Aluminum metal is produced by heating aluminum oxide, Al2O3(s), and other substances to almost 1000…

A: Electrolysis of Aluminum oxide takes place in molten state to form Aluminum.

Q: Apatite is a main mineral source for the production of phosphorus. Calculate the atomic and mass…

A: Molar weight of apatite = 509.2 g/molMass of phosphorus = 123.88 g/mol

Q: Which of the following has the largest covalent radius ?   Mg Ca Sr Ba

A: Covalent radius of an element is defined as the half of the internuclear distance between two atom…

Q: Which of the following is expected to have the lowest melting point? I3D II IV O II O IV O O o o

A: Melting point of a compound depends on the strength of intermolecular forces. Greater is the…

Q: Properties "X" Melting Point (°C) 800 BO 1200 Soluble in water yes no no no по Yes Solid state…

A: Metal are good electrons donors and also they have high melting point and conducts electricity in…

Q: why halogens are highly volatile in nature?

A: Boiling point of a molecule depends upon the intermolecular force present in it. If the…

Q: Draw orbital diagrams for the following atoms and ions. Explain a) Sulfer b) Sulfide (2- charge)…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: NH2 HNO3 H,SO4 2 1

A: When benzene reacts with mixture of acids then nitrobenzene is formed.  Nitrobenzene can be reduced…

Q: For each of the following pairs of substances, predict which member of the pair will have the higher…

A: Ionic compounds have strong electrostatic attractions between oppositely charged ions in an array.…

Q: Which of the following compounds is likely to have the lowest melting point?   : C a O MgO S c O Se…

A: The melting points of the oxides of the Alkaline Earth metals or 2nd group element increases till…

Q: Write the full electron configuration of Si, Si+4 and Si-4. How many valence electrons are in each…

A:

Q: Which has the highest melting point HO. B 3. both 2 and 3

A: We have to choose the following given compounds are the highest boiling point among the three as…

Q: the compound molecular in nature in gas phase but ionic in solid state is: a PCl5  b   CCl4 c  PCl3…

A: PCl5 is molecular in the gas phase

Q: Compare the physical properties (appearance, melting point, boiling point) of silicon dioxide and…

A: Silicon and carbon belong to the same group. The oxides of silicon and carbon are known as silicon…

Q: 2 BaO2 → ВаO + 102

A: A chemical equation is said to be balanced if  atoms of all the molecules  are equal on both side of…

Q: a sample of KClO3 (Mw = 122.55 g/mol) allowed to decompose in presence of MnO2. The resulting oxygen…

A: Given that, A sample of KClO3 decomposed in presence of MnO2. The chemical equation as follows ---…

Q: Use VSEPR theory to determine the 3-D molecular geometry of silicon tetrabromide (SiBr4). :Br.…

A: According to VSEPR Theory,   if the sum of the bond pairs and lone pairs is equal to 2 : the…

Q: 2. For each of the following pairs of substances, predict which member of the pair will have the…

A: Substance which has high forces of attraction between the atoms/molecules/ions has high melting…

Q: For each of the following pairs of substances, predict which will have the higher melting point, and…

A: The melting point of substances depends on the crystaline structure ,type of bonding and inter…

Q: Which of the following elements combines with oxygen to form a covalent network solid. A. Si В. S С.…

A: Since covalent solid can be made between non metals only. Hence Mg is rejected.

Q: H2O 2. HCHO 12)__ Evaporate

A: When aqueous Solution of formaldehyde is evaporated to dryness following product is formed

Q: Each of the following properties shows a regular trend inGroup 1A(1). Predict whether each increases…

A: Introduction: The group 1A of the periodic table belongs to alkali metal. It includes hydrogen,…

Q: Which of the following compounds has the highest boiling point? Не Li Be B. Ne 14 17 Na Mg Al Si ci…

A: Answer:- This question is answered by using the simple concept of boiling point which depends on the…

Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.