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k0ka [10]
2 years ago
11

When does the first step of digestion usually occur?

Chemistry
2 answers:
SVEN [57.7K]2 years ago
5 0

Answer:

B.

when the food is chewed

Explanation:

first step is from your mouth when you chew the food

USPshnik [31]2 years ago
5 0

Answer:

when the food is chewed

Explanation:

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77julia77 [94]

Answer:

The velocity of ball and man after catching ball is  

Explanation:

Since there is no friction and no external force the momentum is conserved .

Here when man catches ball then man and ball move with common velocity .

3 0
2 years ago
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A gold coin contains 3.47*10^23 gold atoms. what is the mass of the coin in grams
Veseljchak [2.6K]
113.5 g Au I think....
4 0
3 years ago
Rank the effective nuclear charge Z* experienced by a valence electron in each of these atoms:
LekaFEV [45]

Answer:

The atoms are ranked in decreasing order as follows:

Fluorine ---4

Carbon ----3

Boron ------2

Beryllium --1

Explanation:

Effective nuclear charge (Zeff) is defined as the difference between the actual nuclear charge (the atomic number, Z) and the shielding constant (S).

It is calculated by finding the atomic number and electronic configuration, attributing a shielding value to each electron, adding all the shielding values and using the formula:

                 Z eff = Z - S

Effective nuclear charges:

An atom of carbon: 3.25

An atom of fluorine: 5.20

An atom of beryllium: 1.95

An atom of boron: 2.60

5 0
2 years ago
Is Sodium Carbonate exothermic or endothermic?
tamaranim1 [39]
Sodium Carbonate(NaCO3) gives off heat hence the reactions involving Na2CO3 are exothermic.

Hope this helps!
4 0
3 years ago
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Gravity pulls rain and snow down to Earth from the atmosphere through a paire
DerKrebs [107]
Role of gravity in condensation.
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