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Alex Ar [27]
3 years ago
12

A thief who has stolen large quantities of uranium-235 may have increased

Chemistry
1 answer:
Gala2k [10]3 years ago
3 0
Nuclear waste not a b or d it’s nuclear waste
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What was the first property used to organize the periodic table?
Thepotemich [5.8K]

Answer:

Explanation:

atomic mass

In 1869, Mendeleev published the first periodic table of the elements. In his periodic table, Mendeleev arranged elements in rows by increasing atomic mass. Within a row, elements with lower atomic masses were on the left. Mendeleev started a new row every time the chemical properties of the elements repeated.

6 0
3 years ago
What mass of Na2SO4 is needed to make 2.5L of 2.0 M solution?
Gala2k [10]
Moles of Na2SO4 = conc. x volume(dm3)
= 2 x (2500cm3/1000)
= 5 mol


Mass of Na2SO4 = moles x molar mass
= 5 x ((23 x 2) + 32.1 + (16 x 4))
= 710.5g
5 0
3 years ago
We want to find how much charge is on the electrons in a nickel coin. follow this method. a nickel coin has a mass of about 5 g.
Lady bird [3.3K]
The mass of a nickel coin is 5 g.
1 mol of Ni weighs 58 g. 1 mol contains 6.022 x 10²³ atoms of Ni.
therefore in 58 g  there are 6.022 x 10²³ atoms of Ni
then in 5 g the number of Ni atoms are - 6.022 x 10²³ /58 x 5 = 5.2 x 10²² Ni atoms
Therefore number of Ni atoms are 5.2 x 10²² atoms in a nickel coin

3 0
3 years ago
Scientists decide that in an experiment on fish, all the fish will be fed the same amount of food
Liula [17]
This is a controlled variable
4 0
3 years ago
How does energy change when it moves?
qwelly [4]

Answer:

Moving objects contain energy. The faster the object moves, the more energy it has. ... Energy can be converted from one form to another form. Kinetic energy can be distinguished from the various forms of potential energy.

Explanation:

8 0
3 years ago
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