Answer:
Explanation:
Answer:
Explanation:
1. Atomic mass of silver:
Atomic mass of an atom is the sum of all the subatomic particles: protons, neutrons and electrons in the atom.
We know that electrons have very negligible mass and the bulk of the mass of an atom is concentrated in the small nucleus which contains protons and neutrons.
Therefore, we can calculate the atomic mass of such element such as Silver by adding the number of Protons and Neutrons together.
Atomic mass = Proton + Neutron
2. Number of electrons = 17
Number of protons = 17
If this atom of chlorine gains an electron more, the number of protons increases by 1 and we then have 18 electrons.
For this atom, it becomes negatively charged as the number of electrons is now greater than that of protons by 1.
3. An atom is the smallest unit of matter that can take part in chemical reaction e.g Na, K etc.
A molecule is a chemical combination of atoms.
Atoms - - - - molecules - - - - matter
4. Protons are positively charged particles in an atom
Neutrons are neutrally charged ie 0 charge
Electrons are negatively charged particles on an atom.
5. We have two elements:
Lithium and fluorine
For chemical combination to occur, there must be gain or loss of electron in such a way that the atom mimics group 8 elements.
Lithium has a configuration of 2,1
It has a valency of 1
The loss of one electron in its outermost shell makes it looks like an helium atom, a noble gas.
Flouirne has a configuration of 2,7
It would require an electron to complete its octet.
The combination Li and F would result into a loss of an electron by Li and it would become psotively charged
Flourine would gain the electron and becomes a posively charged atom.
The compound resulting is LiF: Lithium Fluoride
There is thus a net transfer of electrons. This is an electrovalent bond being created.
6. Graphite and diamond are allotropes of carbon.
Graphite is made up of carbon atoms that are arranged layers on top of one another. They look like sheet.
The carbon atoms on diamond are crosslinked to one another. Each atom bonded to one another in a cubic form.
Answer:
To determine the atomic mass of silver, or any other element, add the number of protons and the number of neutrons together.
If a chlorine atom gains an electron, it will have an unequal number of protons and electrons, which makes it an ion. Because electrons are negatively charged, the ion will be negatively charged, also called an anion.
An atom is the smallest component of an element that retains all of the chemical properties of that element. A molecule is two or more atoms that have bonded together.
Protons and neutrons are found in the nucleus of an atom, while electrons are found in the area surrounding the nucleus of an atom. Protons have a positive charge, electrons have a negative charge, and neutrons have no charge.
Because the lithium atom loses a negatively charged electron, it becomes a positively charged ion, or cation. Because the fluorine gains a negatively charged electron, it becomes a negatively charged ion, or anion. A bond between an anion and a cation is an ionic bond.
Graphite and diamond look different because the carbon atoms bond to one another in different ways in the two minerals. This gives each mineral a unique lattice structure and, as a result, a different physical appearance.
Explanation:
The resulting
'v' vs 't' graph would have a greater positive slope, and would
be higher at any given time.
True
False
A few sentences will do *3-4 sentences is perfect*
Answer:
This is because of the different latitudes and the movement of the stars.
Explanation:
Some constellations can be seen throughout the year and others only at certain times. In addition to the appearance of the night sky changing throughout the year, it also depends on latitude, that is, the appearance of the sky at the same time is different at different latitudes. For example, you can see the Polar star in the northern hemisphere but you cannot see it in the southern hemisphere. Cruzeiro do Sul, seen in the southern hemisphere, is only seen in the northern hemisphere, close to the horizon, in the tropical region.
Another important difference between the two hemispheres is in the movement we observe for the stars over the course of a night as they revolve around the north celestial pole (in the northern hemisphere) clockwise and around the south celestial pole (in the southern hemisphere) in anticlockwise.
Answer:
What is a Pure Substance?
Explanation:
It is something which cannot be divided into parts by physical means, as it's all made up of the same thing. Pure substances are either elements or compounds. Elements can NOT be separated into other types of matter (physically or chemically).
Answer:
an element
Explanation:
Elements are not able to be separated, but everything else can, whether that be physically or chemically.
Not my work i looked it up, so no copy write please rate!
B) none, because the lens is too close to the object
C) a virtual image
D) an inverted real image
Answer:
C
Explanation:
An object that is less than a focal length from a convex lens forms a virtual, magnified image. When the object is closer to a convex lens than the focal point, its rays do not pass through the focal point to form an image on the opposite side of the lens.