Homogeneous materials look the same throughout even throughout even though they contain different materials. --> A. True <--
When solid carbon reacts with oxygen gas to produce carbon dioxide gas. the deltaH (enthalpy change ) value is negative .DeltaH would be on the product side of the equation.
<h3>What is enthalpy change? </h3>
In a thermodynamic system, energy is measured by enthalpy. Enthalpy is a measure of a system's overall heat content and is equal to the system's internal energy plus the sum of its volume and pressure.
Knowing whether q is endothermic or exothermic allows one to characterise the relationship between q and H. An endothermic reaction is one that absorbs heat and demonstrates that heat from the environment is used in the reaction, hence q>0 (positive). For the aforementioned equation, under constant pressure and temperature, if q is positive, then H will also be positive. In a similar manner, heat is transferred to the environment when it is released during an exothermic reaction. Thus, q=0 (negative). Therefore, if q is negative, H will also be negative.
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Answer:
Explanation:
atomicity is the number of atoms in a molecule of a gas.
metalloid is an element that has both metallic and nonmetallic properties, as arsenic, silicon, or boron.
isotopes is members of a family of an element that all have the same number of protons but different numbers of neutrons.
Answer:
To decrease the solubility of the organic product in water.
Explanation:
Methyl benzoate is prepared via <em>Fischer esterification </em>reaction between benzoic acid and methanol in the presence of a mineral acid. The following steps are involved:
- Benzoic acid is dissolved in methanol in a round bottom flask.
- Concentrated sulphuric acid is added and heated under reflux on a steam bath
- Reaction is poured into ice, reaction flask is rinsed with dichloromethane. Layers collected in a test tube.
- Dichloromethane layer is then washed with first sodium carbonate solution(this is done inorder to neutralize and remove the residual benzoic acid) and then with sodium chloride solution(to decrease the solubility of the organic product in water).
- Then Dichloromethane solution is dried over magnesium sulphate.
- Dichloromethane is removed via distillation on a steam bath.
- Collect distillate in a vial on a heating mantle.
<h3>
Answer:</h3>
PCl3: <em><u>COVALENT</u></em>
SiF4: <em><u>IONIC</u></em>
OF2: <em><u>COVALENT</u></em>
H2S: <em><u>COVALENT</u></em>
Ca3N2: <em><u>IONIC</u></em>
hope it helps (^^)
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