Homework Help

HI my name is Sarah im in chemistry 11. im kinda stuck what formula to use and how to get the volume. A gas occupies a volume of 250 mL at 100.0°C and 649 mmHg. What is the volume of the same gas at STP conditions?

HI my name is Sarah, im kinda stuck what formula to use and how to get the volume. A gas occupies a volume of 250 mL at 100.0°C and 649 mmHg. What is the volume of the same gas at STP conditions?

I know how to derive it with the steady state assumptions but I do not know how to approach this question without steady state assumptions (when formation and dissociation of [ES] intermediate is no longer equal to 0 anymore). I can do simple derivations but I’m not too strong in math so if anyone could guide me through, I’d very much appreciate the intellectual help. Thanks. equation: [E] + (k-1)<—>(k1) [ES] —>(k2) [E] + [P]

For my assignment I have to respond to my research question: How has the use of fertiliser in agriculture impacted on the loss of biodiversity in China's marine ecosystems over the past 20 years? I am having trouble finding resources to answer the question. Are there any sites you recommend? I can change the location and time frame in my research question to help get more evidence. The fertiliser is in relation to nitrogen fertiliser and the nitrogen cycle. For the analysis and interpretation, I was aiming on comparing the increase in algae blooms to the consumption / run off of nitrogen fertiliser through using tables and graphs. From there,…

Hello please could I get some help on the below question for an interview! Any useful links, help, blog posts, youtube videos or advice will be great. ‘Potential benefits of triaging evidence at the crime scene’ Consider what the impact of triaging potential body fluid evidence at the crime scene might be, rather than collecting evidence and processing it all back at the laboratory.

Hi my name is Sarah i'm in grade 11. I'm doing this assignment where you have to predict in a double displacement reaction is possible but i don't know how to tell. is there a kind of formula? is it to do if a solid becomes aqueous or vice versa. i asked my teacher but she was no help. Told me i should know this by now. 😔 here are some of my example questions. a) Cu(NO3)2 and Zn(NO3)2 b) AlCl3 and AlBr3 c) Cr2(SO4)3 and FeCl3 d) Ba(NO3)2 and AgCH3COO

Hello, as my username suggests... I am new to science and I am studying online so it is a bit harder to get help with my questions. I have answered the following sum but I have 3 possible answers (probably wrong) so i just want to confirm how to actually work this out properly to see if any of my answers are correct. Also how should I properly display the answer if asked to "give your answer in scientific notation and without any brackets" does this mean show my answer as a sum such as this: A x 10 to the power of B? (not sure how to write in small nexto the 10 to shower the power properly but I'm sure you understand what I mean above)

Hi my name is Sarah iv been stuck on this question for two days, if you could help my it would be amazing 😃 Chromium (II) sulfate is a reagent that has been used in certain applications to help reduce carbon-carbon double bonds to carbon-carbon single bonds. The reagent can be produced by the reaction of zinc, potassium dichromate and sulfuric acid and the other products are zinc sulfate, potassium sulfate and water. a) What is the maximum number of grams of chromium (II) sulfate that can be produced by a reaction mixture containing 3.2 moles of zinc, 1.7 moles of potassium dichromate and 5.0 moles of sulfuric acid? this is the equation i got hopefully i…

Hi My name is Sarah and I need help. Titanium tetrachloride (a gas), carbon monoxide and carbon dioxide can be created from the reaction of titanium (IV) oxide with carbon and chlorine. Iw much (in grams) of each of the excess reagents remain after the reaction takes place? This is the formula: I Think 2TiCl4+Co+Co2=3TiO2+4Cl2+c

Hi My name is Sarah I really need some help The potassium salt of benzoic acid, potassium benzoate, can be created by the reaction of potassium permanganate and toluene (C7H8(l)). By products of the reaction are manganese (IV) oxide, potassium hydroxide and water. If the yield of potassium benzoate cannot realistically be expected to be more than 68%, what is the minimum number of grams of toluene needed to achieve this yield while producing 10.0 g of potassium benzoate? Im just lost as of what to do I dont know if I got it but here is the formula. It just dosint look right to me KMn04+C7H8=Mno2+KOH+H2O

Here are 2 questions: 1. You have a probe pool at 1000 probes in a single pool. The pool concentration is 20nM. We use 5ul of this into our ligation reaction. What is the concentration of each probe in each reaction in fmol/probe? I calculated this out as 100fmol/reaction (20nM*5ul), then 0.1 fmol/probes (100fmol/1000probes). 2. You order some new probes to spike into the 20nM pool. You order as 10 probes in lyophiized (dried) form. You can resuspend dried tube how we want, then spike in some volume of it into the original 20nM probe pool. You want the final molarity to stay as above, 0.1fmol/probe. Calculate and make sure each probe (old and new) ar…

in a triangle ABC, AD is the bisector of angle BAC, meeting BC at D. if AC = 21 cm, BC =12 cm and the length of BD is 2 cm less than DC, then the length of side AB is:

I have a 1x1x1 feet box. I have a heating source in the box which produces "x" watts. How long will it take to increase the temperature of the box by 1 deg C? thankyou.

is sex linked and sex influenced the same thing? do traits that fall under either category also apply to the other one?

Our teacher asked us to use LCM method yo balance PCl5 + H2O. Please help me.

Hi all. I was just wondering how to write balanced dissociation equations (and how to determine the charge of things/the charge of compounds). For example, in class we were given a compound. It was CaCO3 (calcium carbonate). According to the answers, the products of the equilibrium reaction are Ca2+ + CO3-. My first question: How do we know what the products are going to be? (i.e. how do you know that the products aren't going to be Ca + C + O instead?). My second question: How do you know what charges the chemicals are going to have? I always assumed you could just use the periodic table, but our teacher said you can't for transition metals (why is that?). My…

It was reported that a mild earthquake occurred in brass with a result that the plate which is 0.8m square of 0.5m thick usually attached to the base of the antenna pole had its edges displaced by 0.016cm. If the plate is made of brass with a shear modulus of 0.36 x 10^11 N/m². Find the force exerted by the earthquake on the plate.

i need help with my air pressure homework.what happens to a bag of crisps when under water and why? i am only asking because i cant find the answer anywhere else! thx, silverwanderingdoe

Hi! I have been given a question and I have no clue about it, I researched in a lot of sites but nothing... If someone knows the answer to this question, PLEASE HELP! Why did chemists despise alchemists who tried to convert lead into gold?

Hello, I am a student attempting to do photography with Iron Salts and I have a problem. What exactly do these instructions mean? Mix 10 parts of ferrous oxalate (25% aqueous solution), 7 parts of concentrated ammonia solution, and 20 parts of a saturated solution of oxalic acid to produce a photosensitive iron complex. Prepare separately a 25% solution of potassium ferricyanide. Thanks.

Does this do a good job of naming the compound and explaining how I determined it? Step 1 Cation: Fe+3 Anion: O-2 Step 2 Iron has two oxidation numbers Fe+2 and Fe+3 The element iron (a transition metal) has an electron configuration of [Ar] 3d6 4s2 with atomic number 26. It has two electrons in its 4s orbital and 6 electrons in its 4d orbital. When iron loses the two 4s electrons, it attains a valency of +2. It can lose one of the paired electrons from the 3d subshell (which provides a more stable configuration), and it attains a valency of +3. Step 3 Fe2O3 = iron(III) oxide

Phosphorus pentachloride (PCI5) is an exception to the octet rule because it has more than 8 electrons around the valence shell. The chlorine atoms (PCI3) obey the octet rule because the atom has five electrons and need three to fulfill its octet, while the phosphorus atom does not. Phosphorus (PCI5) can form an expanded octet containing ten electrons in the 3d orbitals. is this correct?

Equation is not simplified. It should be Zn + 2HCl —> ZnCl2 + H2 How do do I explain what is wrong with this equation?

I have to show my work for this question and I’m not sure if this is the correct way to do it H2(g) + CI2(g) —> 2HCI(g) The balanced equation is H2 + CI2 —> 2HCI There are two hydrogen (H) atoms on the reactants side and two chlorine (CI) atoms on the reactants side. Two hydrogen (H) atoms and two chlorine (CI) atoms are produced. To balance them, we put a coefficient of 2 in front of the product hydrogen chloride (HCI).

Is this the correct explanation and Lewis structure for ch2O?