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steposvetlana [31]
3 years ago
8

Need these solved ASAP please​

Chemistry
1 answer:
satela [25.4K]3 years ago
5 0

Explanation: SHHHSHHH

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Carbon Hydrogen ......
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An isotope of potassium with a half-life of roughly one billion years is often used in radioactive dating. This isotope decays t
Archy [21]

Answer : The chemical symbol for the element that results from this process is, (Ar) for argon.

Explanation :

Electron capture : In this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. Simply, a proton and an electron combines together to form a neutron. Mass number does not change in this process.

_Z^A\textrm{X}+_{-1}^0\textrm{e}\rightarrow _{Z-1}^A\textrm{Y}

The equation for the given reaction is,

_{19}^{40}\textrm{K}+_{-1}^0\textrm{e}\rightarrow _{18}^{40}\textrm{Ar}

Thus, the chemical symbol for the element that results from this process is, argon (Ar).

5 0
4 years ago
To save time, you can approximate the initial mass of the solid to the nearest ±1 g. For example, if you are asked to add 14.3 g
tensa zangetsu [6.8K]

Answer: Set with equal densities are:

15.2 g copper and 50.0 g copper ; 11.2 g gold and 14.9 g gold

Explanation:

Density is defined as mass of the substance present in unit volume of the substance.

Density=\frac{Mass}{Volume}

It is an intensive property which means that two different masses of same substance will have same value of density under same conditions.

So, from the given samples with equal density are:

  • 15.2 g copper and 50.0 g copper will have the same value density.
  • 11.2 g gold and 14.9 g gold will have the same value density.
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3 years ago
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Which of the following is always a reactant in a combustion reaction?
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Answer:

Oxygen

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Any Hydrocarbon + Oxygen ----> Carbon Dioxide + H2O (Water vapour, gas, water)

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<span>Acetylene is a pure substance so it is homogeneous.</span>
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