Chemistry Homework Assistance
QuestionAI's chemistry problem solver is a middle school chemistry tutoring tool that summarises key chemical reactions and equations in real-time, featuring a robust learning system to empower even those with a weak foundation in chemistry.
You needn't fret over the elemental properties of the periodic table anymore. Here, you can effortlessly access chemical reactions and reaction principles corresponding to each element. Deductive reasoning from microscopic phenomena to discern the original structure of molecules and atoms is a research technique we staunchly champion.
- 22. The table shows standard enthalpy changes of combustion, Delta_(c) H . Substance & Delta_(mathrm(c)) mathrm(H) / mathrm(kJ) mathrm(mol)^-1 mathrm(C)(mathrm(s)) & -393.5 mathrm(H)_(2)(mathrm(~g)) & -285.8 mathrm(C)_(4) mathrm(H)_(10)(mathrm(~g)) & -2876.5 What is the enthalpy change for the following reaction? A 4 mathrm(C)(mathrm(s))+5 mathrm(H)_(2)(mathrm(~g)) arrow mathrm(C)_(4) mathrm(H)_(10)(mathrm(~g)) A -2197.2 mathrm(~kJ) mathrm(~mol)^-1 B -126.5 mathrm(~kJ) mathrm(~mol)^-1 C +126.5 mathrm(~kJ) mathrm(~mol)^-1 D +2197.2 mathrm(~kJ) mathrm(~mol)^-1
- Question 4 of 16 You want to measure the heat given off during four different reactions Each of the reactions takes place in a flask with a lid. Why must each flask have a lid on? so that oxygen doesn't affect the reactions so that contaminants do not foll into the reactions to contain the heat equally in each reaction so that the reaction doesn't get in your eyes
- (r) Iron chloride is produced by heating iron in chlorine gas. The equation for the reaction is: 2Fe+3Cl_(2)arrow 2FeCl_(3) Calculate the volume of chlorine needed to react with 14 g of iron. You should calculate: the number of moles of iron used the number of moles of chlorine that react with 14 g of iron the volume of chlorine needed. Relative atomic mass (A_(r)): Fe=56 The volume of 1 mole of gas=24dm^3 __ Volume of chlorine =underline ( )dm^3
- A GIANT COVALENT structure is hard to melt because... [BOTH of these] there are many strong BONDS that must be broken they do not ABSORE HEAT energy [NEITHER of these]
- (b) Methane burns in oxygen to form carbon dioxide and water. Write the balanced equation for this reaction. __