Volume of the metal = change in volume reading
Volume = 37.4 - 33
Volume = 4.4 ml
Density = mass / volume
Density = 7.101 / 4.4
Density = 1.61 g/ml
Here is a link to a website that explains these observed trends.
https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_Introductory_Chemistry_(CK-12)/06%3A_The_Periodic_Table/6.15%3A_Periodic_Trends%3A_Atomic_Radius
Answer:
69.7 mL ≅ 70 mL
Explanation:
The chemical reaction between hydrobromic acid (HBr) and lithium metal (Li) produces lithium bromide (LiBr) and hydrogen (H₂) according to the following equation:
2HBr(aq) + 2Li(s) → 2LiBr(aq) + H₂(g)
Thus, 2 moles of HBr reacts with 2 moles of Li. So, the stoichiometric ratio is 1:1 (1 mol HBr reacts with 1 mol Li).
We convert the mass of Li to moles by using the molar mass (MM) of LiBr:
MM(LiBr) = 6.9 g/mol + 79.9 g/mol = 86.8 g/mol
moles of Li(s) = mass/MM(LiBr) = 19.4 g/86.8 g/mol = 0.223 moles Li(s)
Now, we can divide the moles of Li into the molarity of the HBr solution to obtain the volume in liters wee need to add:
V = moles Li(s)/M = (0.223 mol)/(3.2 mol/L) = 0.0697 L
0.0697 L x 1000 mL/1 L = 69.7 mL ≅ 70 mL
Therefore, 70 mL of 3.2 M HBr are needed to entirely dissolve the metal.
Answer : The ionic equation will be:
Explanation :
Neutralization reaction : It is a type of chemical reaction in which an acid react with a base to give salt and water as a product that means it reacts to give a neutral solution.
When baking soda (sodium hydrogen carbonate) base react with lactic acid then it react to gives sodium lactate, carbon dioxide and water as a product.
The balanced chemical reaction will be:
The ionic equation will be:
I read a presentation about this experiment.
Hypothesis: If I add salt to water, then it will take longer for the water to freeze.
The given variables were:
Controlled Variables:
1. Refrigerator
2. type of cups used (contains water and varying amount of salt)
Independent Variable
1. Amount of Salt
Dependent Variable
1. Amount of frozen water
Conclusion: Water with salt take longer to freeze.