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pogonyaev
3 years ago
5

When children are young and go to the doctor, the doctor will give them booster shots. This re-exposes the children to a dead po

rtion of a disease to help them build immunity. Which type of immunity is described?
Chemistry
2 answers:
galben [10]3 years ago
7 0

Answer: active

Explanation: i did the quiz was esay

-BARSIC- [3]3 years ago
4 0
Active immunity!

I hope this helped! Mark me Brainliest! :) -Raven❤️
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Create the Lewis structure of CF4. NOTE: do only the step asked for in each part and then click Check–don't work ahead to solve
Naya [18.7K]

To create the Lewis structure we need to take into account the octet rule: atoms tend to gain, lose or share electrons to complete their valence shell with 8 electrons.

C belongs to Group 4A in the periodic table so it has 4 valence electrons. It needs to share 4 pairs of electrons to complete the octet.

F belongs to Group 7A in the periodic table so it has 7 valence electrons. Each F needs to share 1 pair of electrons to complete the octet.

As a consequence, in CF₄, C will form a single bond with each F and all the octets will be complete.

5 0
3 years ago
Hello people ~
pochemuha

Answer:

C

H²O is dissociated in water into H³O+ (hydronium ions) and OH- (hydroxide) given by;

2H²O <-----> H³O+ + OH-

If you notice initially we have 4 hydrogen atoms and 2 oxygen atoms. And similarly after the reaction we have 4 hydrogen atoms and 2 oxygen atoms.

Ratio of H to O is 4:2

or 2:1

This is very intuitive as we have 2 hydrogen atoms and 1 oxygen atom in a water molecule.

8 0
2 years ago
Read 2 more answers
what is the work done by a bird pulling a worm from the dirt with a force of .05 N and a distance of .07 m
masya89 [10]
Hello!

Work=Force*Displacment

Work=.05N * .07m = .0035J

Any questions please feel free to ask. Thank you.
5 0
2 years ago
Displacement
Tanya [424]

Answer:

Option D

Explanation:

Displacement is a vector quantity.

7 0
3 years ago
Humans breathe about 500 mL of air per breath and take about 12 breaths per minute during normal activities. If a person is expo
sasho [114]

Answer:

mass of benzene in the lungs = 28.8 g of benzene

Explanation:

Volume of air breathed per hour = 500 mL * 12 * 60 = 360000 ml = 360 Litres of air

In 8 hours, volume of breathed air = 360 L * 8 = 2880 Litres of air

Concentration of benzene in air = 10 ppm

Note:  1 ppm = 1 mg per liter (mg/L)

10 ppm = 10 mg/L

Therefore, mass of benzene in the lungs in an 8-hour shift = 10 mg/L * 2880 L

mass of benzene in the lungs = 28800 mg

Converting to grams = 28800/1000

mass of benzene in the lungs = 28.8 g of benzene

3 0
2 years ago
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