Table of Contents
The key difference between SiO2 and CO2 is that the SiO2 exists in the solid phase whereas, the CO2 exists in the gaseous phase at standard temperature and pressure conditions. Moreover, Silicon dioxide has got a white colour while carbon dioxide is a colourless compound.
Why do CO2 and SiO2 differ in their physical and chemical properties?
The reason why carbon dioxide is a gas and silicon dioxide is a solid is because their chemical structures are different. Carbon dioxide is a linear structure with two double bonds between carbon and oxygen. It is a small molecule and non-polar with only weak bonds between the molecules. Hence it is a gas.
Why is SiO2 more stable than CO2?
Because silicon atoms are larger than carbon atoms, silicon-oxygen bonds are longer than carbon-oxygen bonds. Because silicon-oxygen bonds are longer than carbon-oxygen equivalents, the p orbitals on silicon and oxygen cannot overlap enough to form a stable pi bond. Therefore, only single bonds are formed.
Why CO2 and SiO2 are not isostructural?
Explanation: As you know, carbon dioxide and silicon dioxide are isoelectronic. They are not isostructural. The shortness of the (first-row) C−O bonds allows effective overlap between the p -orbitals of C and O , in addition to the strong σ bond formed.
Why is CO2 gas but SiO2 solid?
Carbon dioxide is a linear structure with two double bonds between carbon and oxygen. This creates a strong refractory solid (glass and sand are mostly silicon dioxide aka silica).
Why CO2 is gas but CS2 is liquid?
Question: Explain why CS2 is a liquid at room temperature while CO2 is a gas. CS2 has greater dipole moment than CO2 and thus the dipole-dipole forces in CS2 are stronger.
Which of the following property of CO2 and SiO2 is same?
Hint: Both carbon and silicon belong to the same group in the periodic table and this means that these atoms have similar properties. CO2 consists of a carbon atom which is covalently double bonded to two oxygen atoms and SiO2 or silicon dioxide is an oxide of silicon.
Is SiO2 tetrahedral?
In the majority of silicates, the silicon atom shows tetrahedral coordination, with four oxygen atoms surrounding a central Si atom (see 3-D Unit Cell). Thus, SiO2 forms 3 dimensional network solids in which each silicon atom is covalently bonded in a tetrahedral manner to 4 oxygen atoms.
Which has a higher melting point SiO2 or CO2?
The covalent bonds of SiO2 are much stronger than weak intermolecular forces of CO2 and so take more energy to be broken, therefore the melting point of SiO2 is much higher than that of CO2 .
Is SiO2 a covalent solid?
Silicon dioxide, quartz, is a network solid that is covalently bonded. The bonds are covalent because the electronegativities of Si and O are 1.9 and.
Are CO2 and SO2 isostructural?
CO2 and SO2 are not isostructural. C atoms is in sp hybridized state.
Is CO2 a tetrahedral?
The initial VSEPR shape for the CO2 molecule is Tetrahedral. For each multiple bond (double/triple bond), subtract one electron from the final total. The CO2 molecule has 2 double bonds so minus 2 electrons from the final total.
Is CO2 a strong acid?
CO2 is not an acid itself, since it does not contain ions of hydrogen (H+). Carbonic acid (H2CO3) is a weak, H+-splitting acid. Carbonic acid, a weak acid that acidifies the solution, is formed when some of the carbon dioxide dissolves in the water.
Which out of CO2 and SiO2 is a molecular solid?
Silicon dioxide is network solid due to strong intermolecular covalent bond. In carbon dioxide, the molecules are bonded by weak van der Walls force. Hence, they are molecular solids. So, the correct answer is option C.
Which is solid at room temperature CO CO2?
Carbon dioxide is a gas at room temperature while silicon dioxide is a solid at room temperature with a melting point of 1770°C.
Why does carbon dioxide exist as a gas at room temperature?
Oxygen is more electronegative than carbon. Therefore, the oxygens pull the electrons towards themselves with the same force on either side of the carbon atom. These are very weak intermolecular forces that are overcome at room temperature. Thus, carbon dioxide molecules are able to move freely as a gas.
Why will CO2 boil faster than CS2?
CS2 has a higher boiling point than CO2 despite having similar intermolecular forces because it has a larger molar mass. Until a certain point, the potential energy of molecules decrease as they get closer to one another.
What is dry carbon dioxide?
Dry Ice is the common name for solid carbon dioxide (CO2). It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation).
What is structure of CO2?
Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom. It is an important greenhouse gas because of its ability to absorb infrared wavelengths. Carbon dioxide is a chemical compound that is found in Earth’s atmosphere as a gas.
Does SiO2 exist?
Silica (quartz): Silica, SiO2, is a chemical compound that is composed of one silicon atom and two oxygen atoms. It appears naturally in several crystalline forms, one of which is quartz. Silicon dioxide, commonly known as silica (and/or quartz), is a prevalent element in the Earth’s crust.
Is CO2 a discrete molecule?
(C) Acidic. (D) Discrete molecules. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms.
Why is SiO2 not linear?
But why the molecular shape of SiO2 is linear? Because there is no lone pair present on the central atom of the SiO2 lewis dot structure. So, there is no repulsion occur between bond pair and lone pair electrons around the central atom.
Is SiO2 acidic or basic?
Silicon dioxide is an acidic oxide. It will react with strong bases to form silicate salts.
What kind of bond is SiO2?
Silicon dioxide is a covalent compound, rather it is a “polar covalent compound”, in which each silicon atom of a crystal is covalently bonded with four atoms of oxygen and each oxygen is bonded with two silicon atoms.
Why is silica bad for you?
Breathing in very small (“respirable”) crystalline silica particles, causes multiple diseases, including silicosis, an incurable lung disease that leads to disability and death. Respirable crystalline silica also causes lung cancer, chronic obstructive pulmonary disease (COPD), and kidney disease.
