CHEMISTRY HIGH SCHOOL

Why do some substances react with each other while others do not

Answers

Answer 1
Answer: it depends on the Chemical the Substance has. The more Chemicals, the better the Substance gets when its mixed with another.

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Which substance will require more energy to heat if all the samples have the same mass and same temperature change?
Match the following characteristics with their respective tissue types. [ Choose tissue can be multilayered and waterproof to protect from external threats or it can single layered to allow for gas and nutrient exchange this tissue's major function is to support and join other tissues [ Choose ] examples of this tissue are blood, bone, adipose tissue, loose and fibrous [Choose) this tissue type conveys information in the form of electrical transmission; found in the brain and spinal cord [Choose] epithelial tissue connective tissue nervous tissue muscle tissue this tissue type consists of long, thin cylindrical cells that have specialized proteins for contraction
An aqueous solution was prepared containing 1.0mol of AgNO3 and 1.0mol of FeSO4 in 1.00 dm^3. of water. When equilibrium was established, there was 0.44mol of Ag+(aq) in the mixture. Ag + (aq) + Fe2 + (aq) <==> Ag(s) + Fe3+ (aq) . What is the numerical value of Kc? . A 0.35 B 0.62 C 1.62 D 2.89
Which type of formula represents the simplest whole-number ratio of atoms of the elements in a compound?
Excess reagent definition

How does calcium and potassium react differently with water and why

Answers

calcium with water:
When a metal reacts with water( cold water or hot water) then the products formed are metal hydroxide and hydrogen gas.

Metal + steam --------> Metal hydroxide + Hydrogen

Calcium reacts with cold water to form calcium hydroxide and hydrogen gas:

potassium with water.

Potassium reacts violently with cold water to form potassium hydroxide and hydrogen gas:

2K(s)+ 2H2O(l) --------> 2KOH(aq) + H2(g) + heat.
In this reaction so much heat is produced get hydrogen gas formed catches fire and burns explosively.

If an atom has six protons and four neutrons, what is its charge?

Answers

+4 that is the answer  hoped i helped
the charge is always the second number.
4 would be the charge.

did this help?

What is the charge of an electron? Positive one

Positive two

Negative one

Negative two

Answers

Answer:

The correct answer is the c = negative one

Explanation:

Hello! Let's solve this!

The electron is a particle that is part of the atom. The atom is also made up of neutrons and protons. Protons have a positive charge and are located in the nucleus. Neutrons have a neutral charge and are also located in the nucleus.

The electron has a negative charge and travels its orbitals around the nucleus.

The correct answer is the c = negative one
The charge on an electron is negative one

A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher’s head?

Answers

The ball will be subject to potential and kinetic energy at this point in time as it is still rising away from the ground and not yet subject to the pull of gravitational force. The potential energy will account for the forces occurring due to change in relative position of the ball during its flight while kinetic energy will account for the energy derived by its motion.

Answser: as the ball is ascending, its kinetic energy decreases and the gravitational potential energy decreases. When the ball is at the maximum altitude, the gravitational potential energy is maximum and the kinetic energy is minimum. As the ball is descending, it loses gravitational potential energy and gains kinetic energy. The total mechanical energy is conserved.

Explanation:

Remember, gravitational potential energy is due do the position (altitude) and the kinetic energy is due to motion (speed).

Mathematically they are:

Gravitational potential energy = mass × gravitaional acceleration × altitude

Kinetic energy = mass × speed² / 2.

Total mechanical energy = gravitational potential energy + kinetic energy.

The ball starts with a very low gravitational potential energy (low altitude) and high kinetic energy (high speed), as the travels upward and far away from the hitter, the kinetic energy is transferred to gravitational potential energy, so the ball gains altitude and loses speed.

When the ball reaches the maximum altitude, it has lost all the vertical speed, and the kinetic energy is at a minimum level, while its gravitational potential energy is at the maximum.

From that point, the ball starts to descend, losing grativational potential energy and gaining kinetic energy. At the moment that the ball reaches the ground it will be again at the minimum grativational potential energy and maximum kinetic energy.

A gas that extinguishes a flame is hydrogen. true or false

Answers


This is true because it reacts with oxygen

The molar heat of vaporization of water is 40.7kJ/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 100oC to steam at 100oC?A) 1.46 X 10 kJ
B) 1.13 X 102kJ
C) 2.04 X 103kJ
D) 3.66 X 104kJ

Answers

During a phase change the temperature does not change since all of the heat is being absorbed in order to break the intermolecular forces.  Due to that, the formula will not need to have T in it and is actually q=nΔH(v).
n=the number of moles (in this case 2.778mol of water since you divide 50g by 18g/mol).
ΔH(v)=the molar heat of vaporization (in this case 40.7kJ/mol).
q=the heat that must be absorbed
q=2.778mol×40.7kJ/mol
q=113.1kJ
Therefore the water needs to absorb 1.13×10²kJ.

I hope this helps.  Let me know if anything is unclear.
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I need help please, I will give you five stars
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