b) It did not identify the distance between an electron and the nucleus.
c) It contradicted the Heisenberg uncertainty principle.
d) It stated that spectral lines of atoms are similar.
Answer: C
Explanation: Just took it
b) in the presence of an acid
c) when it is in a neutral solution
d) when it is reacting with a metal
Answer is: a) in the presence of a base.
Phenolphthalein is colorless in acidic solutions and pink in basic solutions.
Acid-base indicators are usually weak acids or bases and they are chemical detectors for hydrogen or hydronium cations.
Example for acid-base indicator is phenolphthalein (molecular formula C₂₀H₁₄O₄).
When solution turns phenolphthalein pink, it means it is basic (pH>7).
Phenolphthalein turns pink in the presence of a base.
Phenolphthalein turns pink in the presence of a base. It is a pH indicator that changes color depending on the acidity or alkalinity of a solution. In an acidic solution, phenolphthalein remains colorless, while in a basic solution, it turns pink.
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D. Stratum Corneum
The layer of the epidermis that contains flat, dead cells filled with keratin and surrounded by lipids is (d) Stratum Corneum. This layer is the outermost layer of the epidermis and serves as a protective barrier for the skin, preventing the loss of water and protecting against external pathogens and environmental factors. The accumulation of keratin and lipids in the stratum corneum gives it its characteristic properties.
B. plants cannot grow on them.
C. the angle of their slope is less than 50 degrees.
D. the angle of their slope is greater than 40 degrees.
The right answer is D.
The slopes are differentiated by the following criteria:
*The inclination;
*The orientation;
*The shape of the slope.
The slope can be measured by degrees or percentages. In the mountains, it is necessary to measure the inclination of a slope by degrees and not by percentages of inclination.
to make the conversion it is necessary to consider that a slope of 45 ° equals a slope of 100%.
The ratio of atoms in HCl is
The ratio of atoms in hydrogen chloride shortened as HCl is 1:1. This is because there is only one atom of hydrogen that is reacted with another atom of chlorine. A ratio indicates the relative sizes of two or more quantities.
When given another compound like H₂ SO₄, we can describe the elements as being in the ratio of 2:1:4. Thus, we can see the relative quantities of the individual elements in the given compound.
In conclusion, the ratio of atoms in HCl is 1:1.
Learn more about the ratio of atoms here:
Answer:
Each molecule of HCl is composed of a one-to-one ratio of hydrogen and chlorine.
Explanation:
At room temperature, HCl is a colorless, poisonous gas. Dissolve it in water, and, voilà, you have hydrochloric acid. For the record, acids are substances that release hydrogen ions in water. The more hydrogen ions an acid releases in water, the stronger the acid (see "What is an ion?" below). If you concluded from the above discussion that HCl releases many hydrogen ions in water, you are right!
(2) ionic and is formed by the transfer of two valence electrons
(3) covalent and is formed by the sharing of two valence electrons
(4) covalent and is formed by the transfer of two valence electrons
The bond between Br atoms in a Br2 molecule is covalent and is formed by the sharing of two valence electrons.
The bond between Br atoms in a Br2 molecule is covalent and is formed by the sharing of two valence electrons.
In a covalent bond, atoms share electrons to complete their outer electron shell. In the case of a Br2 molecule, each Br atom has 7 valence electrons and needs 1 more electron to achieve a stable octet arrangement, so they share one pair of electrons to achieve this.
The bond between Br atoms in a Br2 molecule is covalent and is formed by the sharing of two valence electrons.
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