List 4 physical properties of each of the following:

1 answer:

4 0

Copper wire - Tensile strength. Coefficient of thermal expansion, Thermal conductivity, Corrosion resistance.

500g of Butter - density, volume, color and smell

Glass of Milk - white color, smell, taste and volume

Candle - size, shape, color and density

Piece of Aluminum foil - melting point, electrical conductivity, thermal conductivity, electrical resistivity

Spoon of sugar - texture, melting point, boiling point, color

Toothpaste - taste, smell, abrasiveness, cohesiveness

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How many fluorine atoms bond with calcium to form calcium fluoride? one two three four five

Elena-2011 [213]

Calcium fluoride.
Ca is metal, F is non-metal, so they form ionic bond.
Ca as metal can form only positive ion. Ca in the second group, so the charge of Ca ion is 2+. Ca²⁺
F is in the 17th group, so it has 7 electrons on the last level. It is non-metal, non-metal, so it has negative charge -(8-7)=-1. "8" because on the last level cannot be more than 8 electrons. F-ion is F¹⁻.

Ca²⁺ F¹⁻
Number of positive charges should be equal to number of negative charges,
Formula of calcium fluoride
CaF2.
2 atoms Fluorine bond with Calcium.

7 0

3 years ago

Explain how the elimination of a predator from an ecosystem might result in starvation amongst its prey species.

hammer [34]

If there weren't any predators, the population of prey would increase and they would starve due to too many mouths to feed.

6 0

2 years ago

Which type of reactions form salts?

s344n2d4d5 [400]

Neutralization reactions are the reactions type which form salts.

Explanation:

Salts are formed by ionic bonds when the oxidation states of anions and cations are equal and have opposite signs. So one should be highly electronegative in nature and another should be highly electropositive in nature. So the electropositive element will be ready to give electrons and the electronegative element will be ready to accept all the electrons given by the electropositive element. As a whole the compound will be neutrally charged by adding of equal number of positively charged and negatively charged ions.

The reduction or addition of electrons will be occurring in cations and the oxidation or removal of electrons will be occurring in anions.

So the salt formation is based on neutralization reactions.

8 0

3 years ago

Atoms of metallic elements tend to

melomori [17]

Answer:

Explanation:

One of the properties of metals is their abilities to form a stable compounds by losing electron(s). Metals form positive ions (cations) when they lose electron(s).

6 0

3 years ago

What are the n, l, and possible ml values for the 2p and 5f sublevels?

elixir [45]

Answer:

1. 2p sublevels, n = 2, orbital p, l = 1, ml = 0, ±1

2. 5f sublevels n = 5, orbital f, l = 3, ml = 0, ±1, ±2, ±3

Explanation:

The rules for electron quantum numbers are:

1. Shell number, 1 ≤ n

2. Subshell number, 0 ≤ l ≤ n − 1

3. Orbital energy shift, -l ≤ ml ≤ l

4. Spin, either -1/2 or +1/2

So,

1. 2p sublevels,

n = 2, orbital p, so l = 1, ml = 0, ±1

2. 5f sublevels

n = 5, orbital f, so l = 3, ml = 0, ±1, ±2, ±3

7 0

2 years ago