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3 years ago

Thomson's plum pudding model of the atom was most directly replaced or refuted by

Chemistry

2 answers:

andriy [413]3 years ago

7 0

Answer:

A. Rutherford's discovery that atoms contain a nucleus

Explanation:

Goryan [66]3 years ago

4 0

Answer:

A is the answer

Explanation:

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Considering the activity series given below for metals and nonmetals, which reaction will occur?

kozerog [31]

Answer:

the answer is C i just took the test

Explanation:

2AgNO3 + Ni Right arrow. Ni(NO3)2 + 2Ag

5 0

4 years ago

What characteristic frequencies in the infrared spectrum of your sodium borohydride reduction product will you look for to deter

kkurt [141]

Answer:

A)The characteristic frequency to look out for is 1720-1740 cm-1 (for C=O) for which will disappear in the end product but initially present in the reactant.

B)Characteristic frequency present in the infrared spectrum will be at a peak of 3300-3400 cm-1 which will be due to O-H stretch.

C)If the product is wet with water there will be no change in the infrared spectrum

Explanation:

The characteristic frequency to look out for is 1720-1740 cm-1 (for C=O) for which will disappear in the end product but initially present in the reactant.

Characteristic frequency present in the infrared spectrum will be at a peak of 3300-3400 cm-1 which will be due to O-H stretch.

If the product is wet with water there will be no change in the infrared spectrum

5 0

3 years ago

The materials or compounds that are changed into a new compounds in a chemical reaction are know as

OLga [1]

Answer:

Reactants

Explanation:

They become known as reactants

4 0

3 years ago

A pycnometer is a precisely weighted vessel that is used for highly accurate density determinations. Suppose that a pycnometer h

dexar [7]

Answer:

5.758 is the density of the metal ingot in grams per cubic centimeter.

Explanation:

1) Mass of pycnometer = M = 27.60 g

Mass of pycnometer with water ,m= 45.65 g

Density of water at 20 °C = d = $998.2 kg/m^3$

1 kg = 1000 g

$1 m^3=10^6 cm^3$

$998.2 kg/m^3=\frac{998.2 \times 1000 g}{10^6 cm^3}=0.9982 g/cm^3$

Mass of water ,m'= m - M = 45.65 g - 27.60 g =18.05 g

Volume of pycnometer = Volume of water present in it = V

$Density=\frac{Mass}{Volume}$

$V=\frac{m'}{d}=\frac{18.05 g}{0.9982 g/cm^3}=18.08 cm^3$

2) Mass of metal , water and pycnometer = 56.83 g

Mass of metal,M' = 9.5 g

Mass of water when metal and water are together ,m''= 56.83 g - M'- M

56.83 g - 9.5 g - 27.60 g = 19.7 g

Volume of water when metal and water are together = v

$v=\frac{m''}{d}=\frac{19.7 g}{0.9982 g/cm^3}=19.73 cm^3$

Density of metal = d'

Volume of metal = v' = $\frac{M'}{d'}$

Difference in volume will give volume of metal ingot.

v' = v - V

$v'=19.73 cm^3-18.08 cm^3=$

$v'=1.65 cm^3$

Since volume cannot be in negative .

Density of the metal =d'

= $d'=\frac{M'}{v'}=\frac{9.5 g}{1.65 cm^3}=5.758 g/cm^3$

5 0

3 years ago

Write an equation that shows the formation of a barium ion from a neutral barium atom.

Colt1911 [192]

Answer:

Ba -> Ba2+ + 2e-

Explanation:

A neutral atom becomes an iron when that atom loses electrons. The number of electroms lost by that atom determines the ionic charge or charge of it's ion. In this case, a neutral Barium atom (Ba) will become a barium ion, which has a charge of +2, when it loses 2 electrons to a more electronegative atom in a reaction.

The equation is:

Ba -> Ba2+ + 2e-

2e- is the two electrons lost

3 0

3 years ago