The element that would have properties most like calcium (ca) is
Beryllium (Be)
Magnesium (Mg)
Strontium (Sr)
Barium (Ba)
This are elements in group two in the periodic table. They are also known as Alkaline earth metals. They have an oxidation state of 2+ since they have two valence electrons in their outermost energy levels.
For every mole of any substance or element, the total number of atoms is 6.022 x 10^23. This is called the avogadro's number. Hence, for a) for a 0.90 mole copper, the number of atoms is 5.42 x10^23. This also applies for B) which gives silver as given. For c), the number of molecules present in a compound is also the same. Thus, for a,b,and c, the answer is 5.42 x10^23.
Not all DNA codes for proteins
Explanation:
- DNA (Deoxy Ribonucleic acid) is the genetic material present in all the eukaryotes.
- An experiment conducted in the 1960s proved that most parts of DNA are composed of long strings of repeated sequence which does not code for proteins.
- The process involves in coding for a protein are the transcription of DNA to RNA, then translation followed by protein synthesis. There are enzymes involved in these processes.
- As per the latest study, it states that only 1 per cent of genes code for proteins rest 99 per cent is called the non-coding DNA.
Answer:
Ca(OH)₂ + H₂SO₄ → CaSO₄ + H₂O
Explanation:
Chemical equation:
Ca(OH)₂ + H₂SO₄ → CaSO₄ + H₂O
Balanced chemical equation:
Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O
The given reaction is double displacement reaction in which anion and cation of both reactant exchanged with each other. Calcium hydroxide react with sulfuric acid and form calcium sulfate and water.
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AD +CB
Answer:
Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel, and cobalt, and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone.
Gravitational force is is a force that attracts two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. Every object, including you, is pulling on every other object in the entire universe!
An example of gravitational force in the real world is the force that holds the gases in the sun. The force that causes a ball you throw in the air to come down again. The force that keeps the Earth and all of the planets in line in the proper position in their orbits around the sun.
