Student Safety Contract - Flinn Scientific
ties which require the use of hazardous chemicals. Safety in ... vided to you in this student safety contract. ... 3. Never work alone. No student may work in the laboratory without an instructor ... Look for things such as.
Missing: five | Must include: five
Lead is a pure substance
paint is a mixture substance
Answer:
C
Explanation:
In covalent bond there is equal sharing of electrons between the bonding atoms
Answer:
falls to 5.00 M. He'll do this by adding distilled water to the solution until it reaches a certain final volume.Calc
Explanation:
<span>H2O2
First, let's determine how many moles of hydrogen and oxygen atoms we have. Start by looking up the atomic weights of those elements:
Atomic weight hydrogen = 1.00794
Atomic weight oxygen = 15.999
Moles hydrogen = 1.33 g / 1.00794 g/mol = 1.319522987 mol
Moles oxygen = 21.3 g / 15.999 g/mol = 1.331333208 mol
We now have a ratio of 1.319522987 : 1.331333208 and we want a ratio of small integers that is close. Start by dividing all the numbers in the ratio by the smallest value, giving:
1 : 1.008950371
This ratio is acceptably close to 1:1 so I assume the formula is of the form HnOn where n is a small integer. Let's initially assume that n is 1, so the mass would be
1.00794 + 15.999 = 17.00694
Obviously 17 is far smaller than 34.1. So let's divide 34.1 by 17.00694 and see what n should be:
34.1 / 17.00694 = 2.005063815
So the formula we want is H2O2, which is hydrogen peroxide.</span>
