Explain how cobalt-60 and cobalt -59 can be the same element but have different mass numbers

Answers

Answer 1

Answer: The number of protons and the atomic number are the same for both forms of cobalt, but the number of neutrons varies for each cobalt ion.

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What happens when atoms of uranium split apart __?

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a large amount of heat comes out as E= m c^2

The chemical symbol for iron is

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Fe
FeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFeFe

Fe is the chemical symbol for iron FEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

Consider the reaction below. 2Al2O3 mc031-1.jpg 4Al + 3O2 How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed?

Answers

2Al₂O₃ ----> 4Al + 3O₂
2 moles 3 moles

2 moles of Al₂O₃ ---------- 3 moles of O₂
26,5 moles of Al₂O₃ ------ X
X = (26,5×3)/2
X = 39,75 moles of O₂

:)

Answer:

the answer is 3;4

Explanation:

i did the Assignment on edge

The first major source of oxygen gas was _____.a. volcanic outgassing
b. meteorite impacts
c. cyanobacteria
d. banded iron formations

Answers

The first major source of life on Earth was c. cyanobacteria. These organisms produce food by using energy from the sun; they are photosynthetic organisms. Over millions of years these organisms used CO2 in the air for photosynthesis and released oxygen as a byproduct. Over time oxygen concentrations rose high enough to support life.

The word that best fits in the blank in the sentence, "The first major source of oxygen gas was _____" is cyanobacteria. Thus, the answer is letter C. Cyanobacteria are blue-green algae and they are believed to have caused the "great Oxidation Event".

if a jar of honey sits for a long time, sugar may crystallize in the jar.describe two possible cause for this crystallization?

Answers

Answer:

Temperature and humidity

Explanation:

Crystallization occurs in super saturated solution. These are the solutions that have solute to solvent ratio of 2:1 or more. Typical honey is 70% sugar and 20% water (the solute concentration is too high).

Two things cause honey to crystallize.

Temperature
Humidity level

If temperature is lowered the rate of crystallization increases. This is because at low temperature the molecules of solvent come closer and the space between them reduces. This causes the additional solute molecules to be pushed up to form crystals.

Secondly, humidity also plays a key role. If the humidity reduces, the water molecules evaporates from honey into air. This increases the relative concentration of the solute inside the honey, which causes the honey to crystallize.

The two possible causes for crystallization in honey is 1. The condition of the room. (if the temperature keeps rising and dropping rapidly) 2. Crystallization rate also depends on the type of honey you keep in your cabinet. There are 300 different kinds of honey and each type crystalizes differently

10.0 grams of a gas occupies 12.5 liters at a pressure of 42.0 mm Hg. What is the volume when the pressure has increased to 75.0 mm Hg? 0.143 L 6.72 L 7.00 L 22.3 L

Answers

To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

P1V1 =P2V2

V2 = P1 x V1 / P2

V2 = 42.0 x 12.5 / 75.0

V2 = 7.0 L

Answer:

7.00 L

Explanation:

The only thing that varies between the two situations is pressure and volume.

we have the ideal gas equation

$PV=nrT$