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3 years ago

9 different lab rules Explain how students will do a safe lab

2 answers:

7 0

1. Wear equipment at all times when doing procedures.
2. If something breaks step away and do not try to fix it
3. Do not smell or eat the chemicals it is very dangerous
4. Do not put anything up to your eye.
5. Make sure you do not wear something loose so it does not interfere with anything.
6. Do not run or anything with testing tubes.
7. Pay close attention when doing something with chemicals, you do not want to go wrong or explore something up.
8. If glass breaks or something goes wrong, such as accidents or injuries tell the teacher.
9. Do not take off anything you are suppose to wear in class, such as safety goggles, also do not try to mess with chemicals.

motikmotik3 years ago

4 0

Answer:

Report all accidents, injuries and breakage of class or equipment to instructor immediately.
Keep pathways clear by placing extra items on the shelves or under the work tables. If under the tables make sure that these items can no be stepped on.
Long hair (chin-length or longer) must be tied back to avoid catching fire.
Wear sensible clothing including footwear. Loose clothing should be secure so they do not get caught in a flame or chemicals.
Work quietly - know what you are doing by reading the assigned experiment before you start to work. Pay close attention to any cautions described in the laboratory exercises.
Do not taste or smell chemicals.
Wear safety goggles to protect your eyes when heating substances, dissecting, etc
Do not attempt to change the position of glass tubing in a stopper.
Never point a test tube being heated at another student or yourself. Never look into a test tube while you are heating it.

Hope this helps:))

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3 years ago

23491pa undergoes beta decay. what is the mass number of the resulting element?

qaws [65]

Answer is: mass number is 234.
Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.
There are two types of beta decay: beta minus and beta plus. In beta minus decay, neutron is converted to a proton and an electron and an electron antineutrino and in beta plus decay, a proton is converted to a neutron and positron and an electron neutrino, so mass number does not change.

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3 years ago

Read 2 more answers

A hypothetical metal crystallizes with the face-centered cubic unit cell. The radius of the metal atom is 234 picometers and its

AleksAgata [21]

Answer:

$\delta=101.13 g/cm^3$

Explanation:

As can be seen in the Figure in a face-centered cubic unit cell you have:

Six halves of atoms
Eight 1/8 of atom (1 in each corner)

In total:

$n_{atom}=6*0.5+8*\frac{1}{8}=4 atoms$

Now, each side of the cell is 234 picometers (2.34e-8 cm) long

$V_{cell}=L^3=(2.34e^{-8} cm)^3$

$V_{cell}=1.28*10^{-23}cm^3$

Atoms per cm3:

$n=\frac{4 atoms}{1.28*10^{-23}cm^3}$

$n=3.12*10^{23} atoms/cm^3$

Expressing in mass:

$\delta=3.12*10^{23} atoms/cm^3* \frac{1 mol}{6.022*10^{23}}*195.08 g/mol$

$\delta=101.13 g/cm^3$

6 0

3 years ago

How many grams of P4O10 would be produced when 0.700 mole of phosphorus is burned?

AysviL [449]

We can solve the equation and show the solution below:

Oxygen atomic number is 16.
Phosphorus atomic number is 32.

We have the molecular weight:
Molecular weight = (31*4) + (16*10)
Molecular weight = 284 grams/mol

Solving for the grams:

0.4 mole (for P4) * (1 mol P4O10/1 mol P4) * (284 grams P4O10/1 mole P4O10)
Total grams = 113.6

The answer is 113.6 grams.

8 0

3 years ago