CHEMISTRY HIGH SCHOOL

Which element has an atom in the ground state with a total of three valence electrons

Answers

Answer 1
Answer: 1) Aluminum
2) Lithium
3) Phosphorus

Related Questions

Gases tend to diffuse because
__CH4 + __S8 ----> __CS2 + __H2SBalance this equation and calculate the mol CS2 produced when 1.50 mol S8 is used.
Suggest two ways to liquefy the gases.
A city planner needs a new method for cleaning a town’s water supply. He hires a scientist to research the issue. Because the scientist is being paid by the city planner, her research is not valid.True False
Why does the addition of acid increase the solubility of calcium phosphate? a. It decreases the phosphate ion concentration, forcing the equilibrium to the right. b. It increases the phosphate ion concentration, forcing equilibrium to the left. c. It decreases the phosphate ion concentration, forcing the equilibrium to the left. d. It increases the phosphate ion concentration, forcing the equilibrium to the right. e. It decreases the calcium ion concentration, forcing the equilibrium to the right. f. It increases the calcium ion concentration, forcing the equilibrium to the right. g. It decreases the calcium ion concentration, forcing the equilibrium to the left. h. It increases the calcium ion concentration, forcing equilibrium to the left.

The mass of an object is constant, but its weight may change depending on:

Answers

Answer:

gravity

Explanation:

your mass is the same on the moon as is on earth or underwater but your weight changes because of gravity

Increasing temperature increases the number of collisions and the potential energy of the colliding molecules anddecreases the reaction rate.
True or False PLZ HELP!!

Answers

Increasing temperature does increase the amount of collision but it increases the kinetic energy of the molecules not the potential energy. Potential energy brings molecules together or apart (depending) and kinetic energy makes the molecules move around or not. Hope this helps

Which two properties are used to define matter? A.has mass and conducts heat
B.has buoyancy and volume
C.has mass and takes up space
D.conducts energy and has characteristic properties

Answers

The two properties which are used to define matter are that it has massand it takes up space. The other properties do not necessarily apply toeach matter. Such some matter can be a conductor of heat (such as metal)and some not (such as non metals). Likewise, some matter can be buoyantand float on liquid of density more than it but others would not on theliquids of density less than it. In-fact not all the matters areconductors of energy (such as heat, sound, electricity) or at-least avery poor conductor of energy and tend to find application asinsulating agents (non conductors). So the only thing which isnecessarily true is that the matter would definitely have mass in eventheir minutest form as atom and would take up some space.

Ricardo wants to determine the length of a strip of zinc metal. What is the SI unit for length? foot inch liter meter

Answers

Answer : The correct option is, meter

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.

There are seven basic units in the system from which the other units are derived.

The seven base unit are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

As per question, the S.I unit of length of a strip of zinc metal is, meter.

Hence, the correct option is, meter

The Si unit for length is meters.

Which of the following is most likely to be amorphous?-glass
-solid sulfur
-solid calcium
-gold

Answers

Answer: Option (a) is the correct answer.

Explanation:

Amorphous means without any crystalline structure or definite shape. Whereas a solid whose atoms are not bonded together in a definite lattice pattern. This solid is non-crystalline in nature.

For example, glass, gel, plastic etc are all amorphous solids.

Whereas solid sulfur, solid calcium, and gold have a definite lattice pattern and has a crystalline structure. Thus, they are not amorphous solids.

Thus, we can conclude that out of the given options glass is most likely to be amorphous.
the best answer here would be glass.

What needs to happen for a solute to dissolve in a particular solvent?

Answers

Answer: In order to a solute to dissolve in a solvent, both the attraction forces that bind the units of solute together and the intermolecular forces that bind the molecules of solvent together must be weaker than the attraction forces between the particles of solute and the molecules of solvent.


Explanation:


The solute particles in are binded together in virtue of attractive forces (the nature and strength of these forces depends on the particular solute).


The same happens with the solvent molecules: they are binded by attractive forces (similarly, the nature and strength of these forces depend on the particular solvent).


To get dissolved (form solution) the particles of solute must be separated and mixed with the solvent particles in a process called solvatation.


The solute particles must surrounded by the solvent particles.


When the forces of attraction between the solute particles and the solvent are stronger than the forces of attraction that bind the solute particles, the solute particles move away from the solid solute and are integrated into the solution.
the attractions between the solute and solvent molecules must be greater than the attractions keeping the solute together and the attractions keeping the solvent together.
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In any pure sample of CO2, the ratio of the mass of carbon to the mass ofoxygen is always the same. You can justify this ratio by the fact thatcompounds are composed of which of the following?A. Identical molecules created from atoms combined in wholenumber ratiosB. Atoms whose chemical properties do not change during achemical reactionO C. Atoms whose masses do not change during a chemical reactionD. Different molecules which together produce the observedelemental ratios
The first particles to evaporate from a liquid are those
Perform the followingmathematical operation, andreport the answer to theappropriate number ofsignificant figures.1204.2 +4.79613 = [ ? ]