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julia-pushkina [17]
4 years ago
9

How could you tell if a sample of matter is a element

Chemistry
1 answer:
avanturin [10]4 years ago
4 0
<span><span>Terms of good sample

</span>In general, a good sample is which can represent as much as possible the characteristics of the population. In the language of measurement, meaning that the sample must be valid, which can measure something that should be measured. <span>A valid sample is determined by two considerations.

</span>First: The accuracy or precision, the degree of absence of "bias" (error) in the sample. In other words, the less the error rate is in the sample, the more accurate the sample. <span>Benchmarks for "bias" or error is population.

</span><span>Cooper and Emory (1995) states that "there is no systematic variance" that means is there is no diversity of measurement due to the influence of known or unknown, which led to scores tend to lead to a certain point.

</span>Second: Precision. The second criterion is to have a good sample estimate of the level of precision. Precision refers to the question of how close we are to estimate population characteristics. There has never been a sample that can fully represent the characteristics of the population. Therefore, in each sampling always attached keasalahan-error, which is known as "sampling error" Precision is measured by standard deviation (standard error). The smaller the difference between the standard deviation obtained from the sample (S) with a standard deviation of the population (s), the higher the level of precision. Though not always, the level of precision may be increased by adding the number of samples, the fault may be reduced if the number of samples plus (Kerlinger, 1973).</span>
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Which of the following is NOT a function of bones?
saveliy_v [14]

Answer:

d

Explanation:

all of the above are functions of bones

8 0
3 years ago
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When heated, KCIO3 decomposes into KCl and O2
Oksana_A [137]

Answer:

Explanation:

First, the KClO3 moles is determined by using given grams of KCl produced from the reaction.

Next, the moles of O2 produced is obtained by using the moles of KClO3 which then, finally converted into mass of O2.

Analyzing the given chemical reaction clearly shows that, 2 moles of KClO3 produces 2 moles of KCl and 3 moles of O2.

From the given grams of KCl produced the initial grams of KClO3 used in the reaction is determined as follows,

5 0
3 years ago
Locate the ion that has no change in oxidation number in redox reactions.
natali 33 [55]

a. Spectator ions are the ones that are present but does not enter into the actual chemical  reaction.

b. Na⁺ and NO₃⁻ ions are spectator ions involved in this above mentioned reaction

<u>Explanation:</u>

  • In redox reactions, for example reaction of aqueous silver nitrate and aqueous sodium chloride, silver chloride settles down as a precipitate by the addition of Ag⁺ ion from AgNO₃ and Cl⁻ ions from NaCl .
  • The other 2 ions that is NO₃⁻ ion and Na⁺ ion in the reaction do not enter into the reaction and they are called as Spectator ions.

This can be expressed as the following equation,

AgNO₃(aq) + NaCl(aq) →AgCl(s) + NaNO₃

5 0
4 years ago
How many moles are in 3.4×10^23 molecules of H2SO4
Kazeer [188]
1 mole ----------- 6.02x10²³ molecules
? moles ---------- 3.4x10²³ molecules

(3.4x10²³) x 1 / 6.02x10²³ =

3.4x10²³ / 6.02x10²³ => 0.564 moles of H2SO4
6 0
3 years ago
OMG HELP!!!! I SUCK AT SCIENCE
Maksim231197 [3]
Organism are made up of organic molecules consisting of carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus.

The answer is B.
6 0
3 years ago
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