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KengaRu [80]
4 years ago
11

Imagine that you're doing an experiment that requires you to smell the odor of a chemical solution in a beaker. Which procedure

should always be followed? a. Wave the fumes toward your nose with your hand. b. You should never smell chemicals. c. Hold the beaker directly beneath your nose. d. Remove your safety goggles before smelling the chemicals.
Chemistry
2 answers:
Alex787 [66]4 years ago
8 0
The correct answer is (a) wave the fumes toward your nose with your hand. If you smell the chemicals directly, it could be harmful too your health, especially if they are strong. Also remember to <em>never </em>smell chemicals unless you are being told to do so.
Lelu [443]4 years ago
3 0
Wave the fumes toward your nose with your hand so that you don't smell TOO much of the odor. The answer is A
Hope this helps!
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How is pascals law used in the brakes of a car? <br><br> I’m giving 67 points!
bogdanovich [222]

Answer:

A change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid. With that said; in a hydraulic brake system, if the piston in the master cylinder(the part your foot pushes on) is one inch square area and you push with 100 pounds, then 100 pounds per square inch is transmitted to all parts of the hydraulic system. Now if the brake caliper piston(the part that pushes against the brake pad) is 2 square inches then there will be a total of 200 lbs of force being applied by the wheel cylinder, because each square inch has 100 pounds pushing on it. This is basically how cars brake systems are designed in order to reduce the amount of force required by the driver.

Btw if u want to give 67 points u must multiply that by 2 since two people answer and they get half of 67.    Im still happy with my 34 though!

8 0
3 years ago
Explain your thoughts on whether or not using solely IR is a good method to make positive IDs of chemicals.
Fed [463]

Answer:

No, IR should not soely be used to identify molecules

Explanation:

IR is a method that identifies the functional groups in a molecule by deducing the frequency of stretching and vibration of bonds. Each peculiar type of bond has a frequency for the vibration of each bond represented on the IR spectrum.

However, one method is never enough to identify a compound. A combination of methods must always be used to clear up ambiguities arising from overlapping IR frequencies. Also,  interpretation of the nuanced peaks of the fingerprint region in IR spectra is quite challenging and only gives a fair idea of the functional groups present in the compound.

Therefore other methods such as NMR, UV-VISIBLE etc should also be involved in the identification of compounds.

6 0
3 years ago
How many electrons are present in an uncharged atom with its 1s, 2s, 2p, 3s, 3p and 4s subshells filled and with five electrons
marshall27 [118]

25

Explanation

The orbital quantum number of an atomic subshell determines the maximum number of electrons it can contain. For example:

  • Each s orbital (l = 0) holds up to 4 \; l + 2 = 2 electrons
  • Each p orbital (l = 1) holds up to 4 \; l + 2 = 6 electrons
  • Each d orbital (l = 2) holds up to 4 \; l + 2 = 10 electrons

The atom in question here contains four fully-occupied s orbitals, two fully-occupied p orbitals along with 5 electrons in a partially-occupied d orbital. It thus contains

4 \times 2 + 2 \times 6 + 5 = 25 \; \text{electrons}


5 0
3 years ago
What is the chemical formula for an alkene​
aleksandr82 [10.1K]

The formula for alkene is:

C nH 2n

(N is the number of carbon atoms in a molecule)

8 0
4 years ago
Hope me with all this slide :( TYSMMM
White raven [17]

Answer:

exemples of elements with 1 valence electron: Hydrogen, lithium, potassium.

exemples of elements with 2 valence electrons: magnessium, calcium.

boron has 3 valence electrons. Phosphorus has 5 valence electrons.

carbon has 4 valence electrons.

exemples of elements with 5 valence electrons: Phosphorus, nitrogen

exemples of elements with 7 valence electrons: fluorine, chlorine

exemples of elements with 8 valence electrons: helium, argon

Explanation:

the easiest way to know the number of electrons are by the number of the group so 14 is 4, 16 is 6.

7 0
4 years ago
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