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riadik2000 [5.3K]
3 years ago
5

Why is each year's vaccine different?

Chemistry
2 answers:
Degger [83]3 years ago
5 0
Because the birds that fly overseas carry different flu viruses every year.
Gemiola [76]3 years ago
5 0

Answer:

Flu vaccinations are needed each year to ensure you have continuous protection. Though you may have received a flu vaccine last year, your body's immune system from previous vaccinations gradually decreases over time. By the time flu season comes around, your body's immunity to it is virtuality non-existent.

Explanation:

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Balance the following equation<br><br><br><br> WILL GIVE BRAINLIEST!!!!
Darina [25.2K]
The order is
1CH4 + 2O2 ----------- 1CO2 + 2H2O
please give me brainliest
4 0
4 years ago
Elaborate on how to classify elements and pure compounds.
tankabanditka [31]

Answer: C) Elements and pure compounds are homogeneous materials because they have a uniform composition throughout.

Explanation: Element is a pure substance which is composed of atoms of similar elements. Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Elements are compounds form homogeneous materials as they have uniform composition throughout and the components are evenly distributed throughout the material.

Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material.

4 0
3 years ago
Read 2 more answers
Be sure to answer all parts. The balanced equation for the reaction of aluminum metal and chlorine gas is 2Al(s) + 3Cl2(g) → 2Al
Arada [10]

Answer: a) Cl_2 is the limiting reagent

b)  0.27 g of AlCl_3 will be produced.

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} Al=\frac{0.80g}{27g/mol}=0.030moles

\text{Moles of} Cl_2=\frac{0.23g}{71g/mol}=0.003moles

2Al(s)+3Cl_2(g)\rightarrow 2AlCl_3(s)

According to stoichiometry :

3 moles of Cl_2 require = 2 moles of Al

Thus 0.003 moles of Cl_2 will require=\frac{2}{3}\times 0.003=0.002moles  of Al

Thus Cl_2 is the limiting reagent as it limits the formation of product and Al is the excess reagent.

b) As 3 moles of Cl_2 give = 2 moles of AlCl_3

Thus 0.003 moles of Cl_2 give =\frac{2}{3}\times 0.003=0.002moles  of AlCl_3

Mass of AlCl_3=moles\times {\text {Molar mass}}=0.002moles\times 133g/mol=0.27g

Thus 0.27 g of AlCl_3 will be produced.

8 0
4 years ago
Which alignment of the Sun, Moon, and Earth causes a lunar eclipse? А. B. C. D.​
alukav5142 [94]

Answer:

A.

Explanation:

I'm awesome

7 0
3 years ago
When 16.4 g of steam at 100°C condenses how much heat is released?
OLEGan [10]

Answer:

37064 J

Explanation:

Data Given:

mass of Steam (m) = 16.4 g

heat released (Q) = ?

Solution:

This question is related to the latent heat of condensation.

Latent heat of condensation is the amount of heat released when water vapors condenses to liquid.

Formula used

            Q = m x Lc . . . . . (1)

where

Lc = specific latent heat of condensation

Latent heat of  vaporization of water is exactly equal to heat of condensation with - charge

So, Latent heat of  vaporization of water have a constant value

Latent heat of  vaporization of water = 2260 J/g

So

Latent heat of condensation of water will be = - 2260 J/g

Put values in eq. 1

          Q = (16.4 g) x (- 2260 J/g)

          Q = - 37064 J

So,  37064 J of heat will be released negative sign indicate release of energy

4 0
4 years ago
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