Answer:
Because both compounds (CaCl2 and CaBr2) contain elements (bromine and chlorine) from the same group (group 7)
Explanation:
Elements are organized into groups on the periodic table based on the number of valence electrons contained in their outermost shell. These elements in the same group i.e. same number of valence electrons, will behave in a similar manner chemically.
CaCl2 and CaBr2 are two compounds that contains elements (Chlorine and Bromine) from the same group, which is group 7. Elements in group 7 are called HALOGENS and have 7 valence electrons in their outermost shell.
Bromine (Br) and Chorine (Cl) are responsible for the similarity in the properties of CaCl2 and CaBr2 because the Chlorine and Bromine contained in them will cause them to react similarly and behave similarly in the presence of other compounds.
Considering there are different fields of science and many career involving the matter, I'd say that option D. They learn about the world through observation. makes the most sense in this scenario.
I hope this helps! :)
Rods and cones are both photoreceptors located in the retina of the human eye. A photoreceptor is highly specialized type of nerve and in this case is used to detect and monitor vision.
A rod is called a rod because under close examination the shape is actually has a cylindrical shape like a rod or tube. Within the the rod, there are thousands of optic disks, which contain proteins that absorb light and eventually transmit this to the brain. Rhodopsin is the protein which is contained within these optic disks.
A cone has similar features to a rod, in that is also is composed of layers of optic disks that have protein. Similar to its name, the cone photoreceptor is in the shape of its namesake, a cone, or conical in shape. Photpsin is the protieng which is contained with this optic disks.
The processes are very similar in both rods and cones for their basic process of interacting with light waves, in that the light enters and is absorbed by the particular proteins of the rod or cone and then that information is coordinated and sent to the brain.
A huge contrast is related to the number of each of rods (approximately 120 million) to cones (approximately 6 million) in an average retina. Also the concentration and location of the rods and cones is very different. The rods are found along the top and bottom parts of the retina, called the periphery, whereas the cones are found mostly concentrated in and around a dimple called the fovea, in approximately the middle to upper-middle portion of the retina.
Rods do not have the ability to detect color, but are hyper-sensitive to light and as such are a 1,000 times more sensitive to light than cones. Rods are really good at telling us that light is there. Rods also have a very slow time to recover or be able to adapt to new light circumstances.
Cones have a fast recovery time and are also divided into three different types, red, green and blue, in an approximate ratio of 6:3:1
Answer:
See explanation
Explanation:
Recall that a neutralization reaction is one in which an acid reacts with a base to yield salt and water only. The equation is only balanced when the number of each atom on the reactant side is the same as the number of the same atom on the product side.
Let us now complete and balance each reaction equation;
(a) H2SO4 + 2NaOH --------> Na2SO4 + 2H2O
(b) HNO3 + KOH ---------> KNO3 + H2O
(c) 2HCl + Ca(OH)2 -------> CaCl2 + 2H2O
(d) 2H3PO4 + 3Ba(OH)2 ------> Ba3(PO4)2 + 6H2O
() CH3COOH + NaOH --------> CH3COONa + H2O
(1) 2HNO3 + Sr(OH)2 --------->Sr(NO3)2 + 2H2O
(g) 3HF + Fe(OH)3 ------> FeF3 + 3H2O
(h) 4HBr + Sn(OH)4 --------> SnBr4 + 4H2O