Answer:
The answer to your question is: 1.205 x 10²³ atoms of Carbon
Explanation:
Data
Carbons atoms contained in 2.8 g C₂ H₄
MW C₂ H₄ = (12 x 2) + (4 x 1) = 24 + 4 = 28 g
28 g of C₂ H₄ ---------------- 24 g of carbon
2.8 g C₂ H₄ ----------------- x
x = (2.8)(24) / (28)
= 2.4 grams of C
1 mol ------------------- 12 g of Carbon
x ------------------- 2.4 g
x = (2.4x 1) / 12 = 0.2 mol
1 mol ----------------- 6.023 x 10 ²³ atoms
0.2 mol -------------- x
x = (0.2 x 6.023 x 10 ²³) / 1
= 1.205 x 10²³ atoms
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:
Three double bonds and no lone pairs of electrons- trigonal planar
Two single bonds and two lone pairs of electrons-bent
Five single bonds and no lone pairs of electrons- trigonal bipyramidal
Three single bonds and one lone pair of electrons- trigonal pyramidal
Two double bonds and no lone pairs of electrons - linear
Four single bonds and no lone pairs of electrons- tetrahedral
Six single bonds and no lone pairs of electrons- octahedral
Explanation:
The valence shell electron pair repulsion theory gives a description of the shape of a molecule based on the number of regions of electron density present on the valence shell of the central atom of the molecule.
The molecules are distorted away from the shape predicted on the basis of the VSEPR by the presence of lone pairs on the valence shell of the central atom in the molecule. In the absence of lone pairs, the shape of a molecule is exactly the shape predicted on the basis of the VSEPR theory.
<span>If energy is released, the reaction is exothermic. If energy is absorbed, the reaction is endothermic. Since heat is being absorbed in this reaction (to break down H2O into H2 and O), the reaction is endothermic.</span>
