Answer:
2.3*10^-19 M/s
Explanation:
Generally, reaction rate is the product of the rate constant, and the concentrations of the reactants in the system. Therefore, the rate of the reaction can be expressed as:
rate = k*![[CF_{3}CH_{2}F][OH]](https://tex.z-dn.net/?f=%5BCF_%7B3%7DCH_%7B2%7DF%5D%5BOH%5D)
The value of the rate constant k is 1.6*10^8 [1/(M*s)] at the given temperature.
![[CF_{3}CH_{2}F]](https://tex.z-dn.net/?f=%5BCF_%7B3%7DCH_%7B2%7DF%5D)
= 6.3*10^8 molecules/cm^3
![[OH]](https://tex.z-dn.net/?f=%5BOH%5D)
= 8.1*10^5 molecules/cm^3.
However, we need to convert to mol/(L(M). Therefore:
6.3*10^8 *(1000/6.023*10^23) = 1.05*10^-12
8.1*10^5 molecules/cm^3 *(1000/6.023*10^23) = 1.3*10^-15
Thus:
rate =k* = 1.6*10^8* 1.05*10^-12* 1.3*10^-15 =2.3*10^-19 M/s
The answers to your question is B hope this helps.
Answer:
There are many reasons to examine human cells and tissues under the microscope. Medical and biological research is underpinned by knowledge of the normal structure and function of cells and tissues and the organs and structures that they make up. In the normal healthy state, the cells and other tissue elements are arranged in regular, recognizable patterns. Changes induced by a wide range of chemical and physical influences are reflected by alterations in the structure at a microscopic level, and many diseases are characterized by typical structural and chemical abnormalities that differ from the normal state. Identifying these changes and linking them to particular diseases is the basis of histopathology and cytopathology, important specializations of modern medicine. Microscopy plays an important part in haematology (the study of blood), microbiology (the study of microorganisms including parasites and viruses), and more broadly in the areas of biology, zoology, and botany. In all these disciplines, specimens are examined under a microscope.
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Answer:
The answer is flattening
Explanation:
A physical change is generally something that affects the shape of form of the matter and a chemical change results from a chemical reaction. Flames are caused by chemical reactions, as is rust, and the process of a fruit becoming ripe. Thus, the answer is “flattening”.
Answer:
The number of atoms in the outermost shell
Explanation:
For example, the electron shells in the alkali metals contain the following numbers of electrons:
Li: 2, 1
Na: 2, 8, 1
K: 2, 8, 8, 1
They all have one electron in their outermost shell, and they have similar chemical properties.
