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CaHeK987 [17]
3 years ago
5

A solution of known concentration is called

Chemistry
1 answer:
oee [108]3 years ago
3 0

Answer:

It is called standard solution.

Explanation:

I hope this helps! Have a nice dayy! :)

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For which elements are outer electrons and valence electrons the same?
spin [16.1K]

Answer:

The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.

Explanation:

4 0
3 years ago
A student conducts an experiment to determine how the temperature of water affects the time for sugar to dissolve. In each trial
V125BC [204]

The fact that the student used different amount of water (another independent variable) is wrong with the experimental design

WHAT ARE THE COMPONENTS OF AN EXPERIMENT?

  • An experiment aims at solving a scientific problem or answering a scientific question. An experiment should contain a variable being changed called INDEPENDENT VARIABLE and a variable being measured called DEPENDENT VARIABLE.

  • In an ideal experiment, only one independent variable should be used while every other variable should be kept constant. This is done so as not to affect the result of the experiment.

In the experiment conducted by the student in this question, two independent variables were used i.e. the different amount of water and the different temperatures. This is what is wrong about the experimental design.

  • In a nutshell, the fact that two independent variables were used by the student is what is wrong about the experimental design.

Learn more at: brainly.com/question/967776

8 0
3 years ago
A solution has a pH of 12. This solution is:
kolezko [41]

Answer:

basic

Explanation:

pH 7: neutral

12>7

so it is basic

(if <7 than acidic)

3 0
3 years ago
Write the chemical symbols for three different atomic cations that all have 14 protons
yuradex [85]

The symbols for three different cations with 14 protons are Si²⁺, Si⁴⁺, and Si³⁺.

An element with 14 protons must be <em>silicon, S</em>i.

Its electron configuration is [Ne] 3s²3p², so it could lose up to four valence electrons.

The most likely cations are Si²⁺, Si⁴⁺, and Si³⁺ (or Si⁺).

7 0
3 years ago
Read 2 more answers
An alkane used as a lubricant contains 25 carbon atoms. How many hydrogen atoms are present in its structure?
nadya68 [22]

Answer:

52

Explanation:

Alkanes are saturated hydrocarbons, that is, they are formed just by carbon and hydrogen atoms bonded through single covalent bonds. The general formula for alkanes is CnH2n+2.

If n = 25 (25 carbon  atoms), 2n + 2 = 2 × 25 + 2 = 52. There are 52 hydrogen atoms in the structure and the alkane has the formula C₂₅H₅₂.

5 0
3 years ago
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