`The oxidation of aluminium is a pretty commoon reaction, and happens via the equation 4Al + 3O2 → 2Al2O3. Which reactant is limiting if you begin with 5.00 grams of Al and 9.50 grams of O2?

Rusting of iron is a very common chemical reaction. It results in one form from Fe reacting with oxygen gas to produce iron (III) oxide. Your sample of iron is 12.0 moles of iron. So which if these is a true statement? NOTE: All numbers located immediately after elemental symbols below should be considered subscripts.

Which of the following is NOT true regarding calculating percent yield?

If I need 2 slices of bread, 3 slices of ham, and 1 slice of cheese to make 1 sandwich, how many slices of bread are needed to make 5 sandwiches?

Solid Iron (III) reacts with oxygen gas to form iron (III) oxide, which is the compound we see when rust is present.  Based on this information, which of the following is true? 4Fe + 3O2 ---> 2Fe2O3

If you happen to be fortunate enough to have some silver laying around the house, you are aware if its ability to tarnish. For example, elemental silver can react with hydrogen sulfide (H2S) gas in a single displacement, gas evolution reaction. Assuming there was 1.00 g of H2S floating around in the air, and you had a 2.00 g of pure silver, and there was nothing else preventing them from reacting completely, what would be the limiting reactant?

Let's just consider the concept of stoichiometry without any confusing chemicals. Here is a generic equation: 2Q + 3R → 3S + 4T. If you mix 5 units of Q and 7 units of R, what would be the limiting reactant?

As much as we would like for it to be the case, we never get all I the product we are supposed to get when we run a real reaction. Suppose you have a theoretical yield of a 50.0 grams of product. However, your actual yield is only 32.0 g. What is your percent yield?

One way to make ammonia is to synthesize it directly from elemental nitrogen and hydrogen (though this isn't that easy). The equation for this reaction would be N2 + 3 H2 → 2 NH3. If you are able to stream in 7.0 g of N2, what would be the minimum amount of H2 in grams that would be required to completely react with this amount of N2?

Percent yield is very important in terms of money. The higher the percent yield, the more of a product you can make. If you are working for a drug company and your theoretical yield is 120 kg, but you actually made 105 kg, what is your percent yield?

Let's just consider the concept of stoichiometry without any confusing chemicals. Here is a generic equation: 2A + 3B → C + 3D. Suppose you mix 6 units of A with 8 units of B, which of these would be a true statement?

Most metals are very reactive, as are the elements in the halogen group. Aluminum, for instance, For example, reacts with elemental chlorine to form aluminum chloride. If you have a 13.5 g sample of Al, which choice below is true?

To determine the limiting reactant in a chemical reaction, you need to know all of the following EXCEPT:

In chemistry, some reactions are linked to other reactions.  For example, in the decomposition of potassium chlorate, oxygen and potassium chloride are produced. Then, the oxygen can react with magnesium and produce magnesium oxide. Using the reactions below, if you start with exactly 6 moles of potassium chlorate, how much magnesium oxide can you produce? 2 KClO3 → 3 O2 + 2 KCl 2 Mg + O2 → 2 MgO

Propane is commonly used to heat gas grills. Using the balanced equation below and stoichiometry, which of the following is FALSE? C3H8 + 5O2 → 3CO2 + 4H2O

Milk of magnesia (Maalox) contains magnesium hydroxide. Magnesium hydroxide can be reacted with hydrochloric acid to form magnesium chloride and water, as seen in the reaction below.  Using this reaction, how many grams of hydrochloric acid are needed to fully react 355g magnesium hydroxide? Mg(OH)2 + 2HCl --> MgCl2 + 2H2O

Calculating your percent yield based on your amount of reactants is a very important concept in chemistry. There's a little math involved, but it's something we have to be able to track for many reasons, including but not limited to cost, safety, and time. Regarding the concept of limiting reactant and percent yield, which of these choices are NOT true?

Sodium and chlorine are very dangerous by themselves. However, when we combine them together in a chemical reaction, we eat it--it's table salt: 2Na + Cl2 → 2NaCl. If I have 5.00 mol of chlorine gas and excess sodium, how many moles if table salt could I theoretically make? NOTE: All numbers located immediately after elemental symbols should be considered subscripts.

If you run a particular reaction, and in theory it was supposed to yield 50.0 grams of product, and the percent yield is 75%, how many grams did you actually end up with?

Methanol is an ingredient in windshield washer fluid and ingesting as little as 4 mL can cause blindness in humans. In the reaction below, methanol is produced from carbon dioxide and hydrogen gas. If the reaction has a △H rxn = -128 kJ, how much heat is released when 16.8 g CO is reacted? CO + 2 H2 → CH3OH

N2 is non-reactive, however, if you can get it to react with H2, it does so in a 1:3 mole ratio (N2:H2) and releases 92.0 kJ of thermal energy. That means which if these statements are true?

How many significant figures does 0.105 have?

What does accuracy refer to when discussing data measurement?

How many significant figures does 0.005 have?

What is the transmittance if you measure the potassium permanganate on the preset conditions at 544 nm and 100 μM?

What is the absorbance if you measure the potassium permanganate on the preset conditions at 544 nm and 100 μM?

What is the transmittance if you measure the drink mix on the preset conditions at 508 nm and 100 mM?

What is the absorbance if you measure the copper (II) sulfate on the preset conditions at 780 nm and 100 mM?

What is the absorbance if you measure the potassium dichromate on the preset conditions at 392 nm and 100 μM?