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Sveta_85 [38]
3 years ago
13

Mucin, a component of saliva, functions to __________.

Chemistry
1 answer:
Mariulka [41]3 years ago
4 0
A critical function of mucin in saliva is to protect the mouth from drying out. Mucin also lubricates the tissues and teeth in the mouth and protects them against pathogens and toxins
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How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal
Svet_ta [14]
Ca + 2HCl = CaCl₂ + H₂

m(Ca)=60 g
c=1.25 mol/l
M(Ca)=40g/mol
v-?

m(Ca)/M(Ca)=m(HCl)/[2M(HCl)]=n(HCl)/2

n(HCl)=2m(Ca)/M(Ca)

n(HCl)=cv

cv=2m(Ca)/M(Ca)

v=2m(Ca)/{cM(Ca)}

v=2·60g/mol/{1.25mol/l·40g/mol}=2.4 l = 2400 ml

2400 milliliters of a 1.25 molar HCl solution would be needed

3 0
3 years ago
Help please!!!! I need to know the answer to this problem it would mean a lot if u helped :))
inn [45]
Nobel gas, it is in the last row of the periodic table and therefore is a noble gas
4 0
3 years ago
How to write 310,763,136 in expanded form
andreyandreev [35.5K]

Answer:

Explanation:

"Three hundred ten million, seven hundred sixty-three thousand, one hundred thirty-six".

8 0
3 years ago
Read 2 more answers
The correct lewis structure for COH2 contains how many covalent bonds?
VARVARA [1.3K]

Answer:

Four covalent bonds.

Explanation:

Hello,

In this case, given the attached picture in which you can find the Lewis dot structure for metanal (formaldehyde) we can see two C-H bonds and two C-O bonds via a double bond, thus, we can compute the type of each bond given the electronegativities of hydrogen, carbon and oxygen which are 2.1, 2.5 and 3.5 respectively:

C-H=2.5-2.1=0.4\\C-O=3.5-2.5=1.0

Thus, since both electronegativity difference are less 1.7 we infer that all of them are covalent, therefore, it has four covalent bonds, two C-H bonds and a double C-O bond.

Best regards-

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3 years ago
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