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.
- (Total 11 marks) Q10. This question is about the reaction between sodium thiosulfate solution and hydrochloric acid. The equation for the reaction is: Na_(2)S_(2)O_(3)(aq)+2HCl(aq)arrow 2NaCl(aq)+H_(2)O(l)+SO_(2)(g)+S(s) (a) The mass of the conical flask and contents was greater at the start of the reaction than at the end. Explain why. __
- How many moles are present in 10.0 grams of sodium hydroxide (NaOH)? __ moles Your answer should be rounded to the nearest hundredth. Do not include units in your answer.
- An __ is a single negatively charged sub-atomic particle found in the shells of an atom
- Magnesium chloride (MgCl_(2)) is an ionic compound. The diagram shows the electronic configurations of atoms of magnesium and chlorine. (i) Describe how magnesium atoms and chlorine atoms form magnesium ions and chloride ions. __ (ii) Drawa diagram to represent the electronic configurations of each of the ions in magnesium chloride. Show the charge on each ion.
- 1. Find the number of atoms of phosphorus (P) in 3,44 moles of phosphorus. 2. What is the mass of 0.38 moles of cobalt (Co)? 3. How many moles of nickel (Ni) is 3.88times 10^25 atoms of nickel? 4. How many atoms is 3.75 moles of iron (Fe)? 5. Find the number of moles of sodium (Na)in 145 g of sodium. 6. How many moles is 0.55 g of magnesium (Mg) 7. If you have 7.22times 10^23 atoms of chromium (Cr) how many moles of chromium do you have? 8. What mass of tungsten (W) is 35 moles of tungsten? 9. How many atoms is 5.2 moles of titanium (Ti)