What element is this? How do you know?
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Atom is the most basic unit of matter. They are the general term used to describe pieces of matter. But a different kind of atom makes up an element. A combination of atom of different elements creates a molecule. For example, you have water; it has a chemical formula of H2O. If you separate H from O, you have two atoms. Two atoms for hydrogen and one atom for oxygen. However, they are of different elements. And when you combine them to form H2O, you create a molecule.
Related Questions
A cluster of billions of atoms that all have magnetic fields lined up in the same way is known as aa. magnetic field line. b. magnetic pole. c. magnetic domain. d. permanent magnet. The region around a magnet where the magnetic force is exerted is known as its a. magnetic pole. b. lodestone. c. magnetic field. d. magnetic domain.
A mixture of uneven distribution and easy separation is called. homogeneous a solution heterogeneous a standard
The standard cell potential for the aqueous reduction of Pb4+ to Pb2 + ions by the corresponding oxidation of Ce3+ to Ce4+ ions, Pb4 •(aq) + 2 Ce' •(aq) --'> Pb'•(aq) + 2 Ce4+(aq) is 0.06 V a
When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. +1 D. -2
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The right answer is physical change.
In the general sense, dissolution is the action of dissolving something, that is to say, of decomposing it by the separation of its parts.
In chemistry, dissolution is an intimate mixture of two bodies, at least one of which is liquid.
Eg: the dissolution of sugar in the water, the sugar will pass from the solid and dry state to the dissolved state so there is a physical change. The sugar is going to be surrounded by water molecules and form hydrogen bonds, so it can be a chemical change.
physical change
chemical change
the easy way to tell the difference is
a physical change is genrally reversable
it changes the look but not the composition
for example, water freezes into ice is physical change
a chemical change is generally not reversable (easily)
ex metal rusting, egg rotting
it changes theh composition itself
when a substance disolves, it actually merges and the molecules move around and sometimes bond
so it's a chemical change
(3) unstable nuclei emit alpha particles
(4) unstable nuclei emit beta particles
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The unstable nuclei emit beta particles.
What is unstable nuclei?
An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom's nucleus may result from an excess of either neutrons or protons.
What is beta particle?
- An unstable nucleus can emit a fast-moving electron called a beta particle, to become more stable.
- Beta radiation is made up of a stream of beta particles emitted from unstable nuclei.
- Beta radiation is normally emitted from unstable nuclei in which the number of neutrons is much larger than the number of protons.
- A beta particle has a relative mass that can be considered to be zero, so its mass number is zero, and as the beta particle is an electron, it can be written as ⁰₋₁e. It can also be written as ⁰₋₁β.
Atoms of I-131 spontaneously decay when the unstable nuclei emit beta particles.
The unstable nuclei undergo spontaneous decay by emitting radiations to attain stability. Stability of isotopes is based on the ratio of neutrons and protons in its nucleus. Although most nuclei are stable, some are unstable and spontaneously decay, emitting radiation.
Hence, option 4 is the answer.
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Answer;
(4) unstable nuclei emit beta particles
Atoms of I-131 spontaneously decay when the unstable nuclei emit beta particles.
Explanation;
-Unstable nuclides undergo spontaneous change or the spontaneous decay by emitting radiations to attain stability. Stability of isotopes is based on the ratio of neutrons and protons in its nucleus. Although most nuclei are stable, some areunstable and spontaneously decay, emitting radiation.
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b. Carbonates
c. Hydrocarbons
d. Nitrous oxides
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Hydrocarbons are a type of organic compound. The answer is letter C. Hydrocarbons contains a carbon, hydrogen and oxygen bond that makes it organic. Chlorides, carbonates and nitrous oxides are not organic compounds but they are inorganic compounds.
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Answer:
A) Stratosphere
B) trosphere
C)mesosphere
D)thermosphere
Explanation:
D) thermosphere
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The balanced equation of the reaction between hydrogen and nitrogen to produce ammonia would be:
Ammonia is produced when nitrogen reacts with hydrogen.
Stoichiometrically, 1 mole of nitrogen is required to react with 3 moles of hydrogen with 2 moles of ammonia being the product.
Thus, the balanced chemical equation for the reaction would become:
More on balancedequations can be found here: brainly.com/question/7181548?referrer=searchResults
Answer:
Balanced chemical equation:
N₂ + 3H₂ → 2NH₃
Explanation:
Chemical equation:
N₂ + H₂ → NH₃
Balanced chemical equation:
N₂ + 3H₂ → 2NH₃
Step1:
Left side of equation Right side of equation
N = 2 N = 1
H = 2 H = 3
Step 2:
N₂ + H₂ → 2NH₃
Left side of equation Right side of equation
N = 2 N = 2
H = 2 H = 6
Step 3:
N₂ + 3H₂ → 2NH₃
Left side of equation Right side of equation
N = 2 N = 2
H = 6 H = 6