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san4es73 [151]
4 years ago
5

Trial and error learning is an example of

Chemistry
1 answer:
lbvjy [14]4 years ago
8 0

Answer:

A is your answer i believe

Explanation:

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A class of substances known as __________ are used for their medicinal properties.
Misha Larkins [42]

Answer: Alkaloids

A class of substances known as alkaloids are used for their medicinal properties.

Explanation:

Alkaloids are small but complex organic substances with at least one nitrogen atom in its ring structure. Hence, they have strong basic properties, and are produced in naturally by some plants.

Examples of alkaloids and their medicinal properties are as follows:

- caffeine, used in certain drug and drinks to stimulate the nervous system

- morphine, used to reduce pain and induce sleep in humans.

- cocaine, nicotine etc

6 0
3 years ago
Read 2 more answers
How many moles of caco3 are there in an antacid tablet containing 0.515 g caco3?
MaRussiya [10]
The  moles  of  CaCO3  which  are  there  in  antacid  tablet  that  contain  0.515g  CaCO3  is  calculated  as  follows

moles  =mass/molar  mass

the  molar  mass  of  CaCO3 =  ( 40  x1)+  (12  x  1)  + (16 x  3)=  100  g/mol

moles  is  therefore=  0.515g/100 g/mol=  5.15  x10^-3  moles


8 0
3 years ago
Read 2 more answers
Which correctly summarizes the trend in electron affinity?it tends to be very high for group 2.it tends to be more negative acro
STALIN [3.7K]
The statement that correctly summarizes the trend in electron affinity is the second option: it tends to be more negative across a period".<span> Electron affinity is the energy absorbed or released by a neutral atom when it absorbs an electron. The more negative the electron affinity the higher the affinity of the atom for an additional electron. So as the electronegativity trends to increase across a period, indicating that the atoms of the left side pull stronger the electrons, the fact that the electron affinity is more negative across a period tells that the atoms to the left accept better an additional electron.</span>
4 0
4 years ago
Read 2 more answers
Seawater has a salinity of 3.5%, i.e. 35 g of solid NaCl for one kilogram of seawater. For simplicity, assuming that all dissolv
artcher [175]

Answer:

π = 29.3 atm

Explanation:

The osmotic pressure π is given by

π = i MRT, where i=Vant Hoff factor =2 for NaCl ( 2 moles ions/mol NacL)

                            M = molarity

                            R = 0.0821 Latm/molK

                            T = temperature K

Assuming density of solution is 1 g/mL

M= 35 g/58.44 gmol / 1 L =  0.60 M

π = 2.0 x 0.60 mol/L x 0.0821 Latm/kmol x 300K = 29.3 atm

6 0
3 years ago
Whag is the answer. please i need help​
icang [17]

Answer:

First option

Explanation:

Students 1 and 2 have precise measures yet is is not accurate since they measure around 5.

5 0
3 years ago
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