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PolarNik [594]
4 years ago
5

Name the process that changes matter into one or more new substances

Chemistry
1 answer:
Brums [2.3K]4 years ago
6 0
Chemical change or process
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What is heterogenous mixture​
natulia [17]

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<em>heterogeneous mixture is a mixture that is non-uniform and contains smaller component parts.</em>

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why only elements 1-20 (hydrogen to calcium) are shown through Bohr-Rutherford models. Any element bigger than calcium (those in
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As previously discussed, there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. Each element, when electrically neutral, has a number of electrons equal to its atomic number.

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3 years ago
B. the radioactive atom decays by alpha emission. write an equation showing the decay. (1 point)
zalisa [80]

alpha decay is an emission of ₂⁴He nucleus. If an element undergoes an alpha decay, the mass of the daughter nucleus formed is reduced by 4 compared to mass of parent atom and atomic number is reduced by 2 compared to atomic number of parent atom.

Let's assume that the parent atom is X, atomic number is z and mass number is A. Then the formed daughter nucleus, Y should have atomic number as z-2 and mass number as A-4.

The equation is

(z) (A)X → ₂⁴α + (z-2)(A-4)Y


Example:

₉₄²³⁹Pu → ₂⁴α + ₉₂<span>²³⁵U</span>

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3 years ago
How many grams of AgNO3 are needed to make 250 ml of a solution that is 0.135 M
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( About ) 5.7 grams

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Take a look at the attachment below for a proper explanation;

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Which of the following statements is true?
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