The weak base ionization
constant (Kb) for HS is
equal to:

Answer:

solid is definite volume and shape

liquid is a definite volume but not a definite shape because it can move around and fit into different shapes, like on different water bottles.

gas is not a definite volume and not a definite shape because gas particles can expand and spread out which affects both volume and shape

Answer:

3. The proton number is 15.

Explanation:

Phosphorus, P is the element with the atomic number = 15. The atomic number = Number of protons. That means:

3. The proton number is 15.

Now, the number of protons = Number of electrons = 15.

And, nucleon number = Number of protons + number of neutrons. The must abundant phosphorus atom contains 16 neutrons and nucleon number is: 15+16 = 31.

Thus, we can know which statement is true.

Answer:

3.6 ×10^23

Explanation:

moles = mass/ molar mass

molar mass= (1×32) +(3×16)= 80

moles = 48/ 80

=0.6

moles = number of molecules/ 6×10^23

number of molecules = moles × 6×10^23

=0.6 × 6×10^23

=3.6 ×10^23

A plane mirror is a flat piece of glass that reflects an image that is identical (or nearly identical) to the object in front of it.

Answer:

Sodium is very reactive in nature. When exposed in air, it automatically forms Na2O. When it is put in water it reacts vigorously and starts burning on water. Due to the above reasons Sodium is called an active metal

Explanation: hope this helps pls mark as brainliest ty

Answer:

it is the last one

Explanation:

cause over time the meatl will imit heat and heat up the air around it as it cools down slowly

Answer:

the equation is balanced

Explanation:

the equation is balanced

Explanation:

the equation is blanced

C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)(propane)

CH4 + 2O2 → CO2 + 2H2O. (Methane)

2C4 H10 + 13O2 → 8CO2 + 10H2 O.(butane)

Answer:

The errors in the case are;

1. Error; Removing the tape containing the signatures of the crime scene evidence collector, which removes the record/signature of the crime scene evidence collector in chain of custody

Correct; The original signature of the crime scene evidence collector should left on the package and the package should be opened at another location

2. Error; Placing the reseal back at the same location of the initial seal placed by the evidence collector

Correct; The package should be opened at a different area from the point in which it was sealed when it is received

3. Incorrect; Resealing the bag at the same point it was opened

Correct; On completion, the lab technician should place the evidence with the package, which was opened at a location different from its original opening, in a new package, which is then sealed and she should sign off on the evidence chain-of-custody log before bringing the evidence to the next lab technician at the lab

Explanation:

Evidence collection process requires the documentation of the specific place or spot that the evidence was located, proper evidence packaging, and maintenance of a correct chain of custody

A complete and proper chain of custody

a) Ensure the number of persons who handle the evidence is limited

b) Verify tat the chain of custody documents lists all the names, dates and identification number

c) Ensure to collect signed or secured receipt when the evidence is being transferred

Answer:

D. Fusion

Explanation:

D. Fusion

Hope this helps! :)

Answer:

See explanation

Explanation:

According to the particulate theory of matter, gas particles do not interact with each other. A gas is composed of isolated particles moving at high velocities and collide frequently with each other and the walls of the container.

Since the particles of a gas are mostly isolated, it is easy to compress the gas when pressure is applied thereby bringing the gas particles closer together.

On the other hand, in the solid state, the particles that compose matter are close together. These particles only vibrate about their mean positions due to strong intermolecular interaction between particles. The fact that the particles of the solid ion are so close together makes the solid iron lump to possess high density.

Answer:

Si.

Explicación:

Sí, el método de cristalización se utiliza para separar la sal del agua y obtener los componentes de la sal y del agua por separado. La cristalización es un método o técnica que se utiliza para purificar compuestos sólidos. Este proceso funciona mejor debido a las diferentes solubilidades del compuesto deseado y las impurezas que están presentes en un solvente dado. El proceso de cristalización implica enfriar agua salada para formar cristales de hielo puro. Luego, los cristales de hielo se separan de la salmuera no congelada, se lavan para eliminar la sal residual y luego se derrite la solución para producir agua dulce.

Answer:

Use a line graph

Explanation:

Answer:

Explanation:

Answer: The correct option is [tex]NO_2(g)[/tex]

Explanation:

A catalyst is defined as the chemical species that increases the reaction rate but does not participate in it and is left behind after the completion.

A homogeneous catalyst is one that is present in the same phase as the reactants and products.

A heterogeneous catalyst is one that is present in different phase as that of reactants and products.

For the given chemical reaction:

[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]

As all the reactants and products are in gaseous state so, the homogeneous catalyst must also be in the gaseous state only.

Hence, the correct option is [tex]NO_2(g)[/tex]

Answer:

a

Explanation:

Answer: b

Explanation:

I took the test

The correct answer is LiOH and Li2SO4.

A strong acid is neutralized by a strong base to yield a normal salt.

A neutralization reaction is a reaction between an acid and a base to yield salt and water only.

An acid can be strong or weak. A base can also be strong or weak.  "Strong" or "weak" has to do with the extent of ionization of the acid or base in water. Usually, a strong acid is neutralized by a strong base.

Since H2SO4 is a strong acid, it will require a strong base such as LiOH to neutralize it and the product will be the normal salt Li2SO4.

https://brainly.com/question/16255996

Answer:

Some of the common impacts of earthquakes include structural damage to buildings, fires, damage to bridges and highways, initiation of slope failures, liquefaction, and tsunami.

Answer:

C. WATER VAPOUR

these are gaseous in state so gases have more entropy than other states.

nope it helps

have a nice day

Answer:

0.0602g

Explanation:

60.2mg is equal to 0.0602grams.

Answer:

Temperature.

Explanation:

Kinetic molecular theory of gases states that gas particles exhibit a perfectly elastic collision and are constantly in motion.

According to the kinetic-molecular theory, the average kinetic energy of gas particles depends on temperature.

This ultimately implies that, the average kinetic energy of gas particles is directly proportional to the absolute temperature of an ideal gas. Thus, an increase in the average kinetic energy of gas particles would cause an increase in the absolute temperature of an ideal gas.

Temperature can be defined as a measure of the degree of coldness or hotness of a physical object. It is measured with a thermometer and its units are Celsius (°C), Kelvin (K) and Fahrenheit (°F).

Answer:

e) 5

Explanation:

Because it's H

Answer:

The atoms present at the beginning of the reaction is equal to the atoms present at the end of the reaction. This is because matter can neither be created nor be destroyed in an ordinary chemical reaction.

Explanation:

During photosynthesis, 6 molecules of water react with 6 molecules of carbon dioxide to form 1 molecule of glucose and 6 molecules of oxygen. The equation for the photosynthesis reaction is

6CO2 + 6H2O --> C6H12O6 + 6O2

At the beginning of the reaction, there is 6 carbon atoms, 18 oxygen atoms and 12 hydrogen atoms while at the end of the reaction, there is 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms.  This is because according to the law of conservation of mass and matter, it can neither be created nor be destroyed in an ordinary chemical reaction. The number of atoms present at the beginning of the reaction must be equal to the number of atoms present at the end of the reaction.

Answer:

What happens when one adds (NH4)2S to a solution that contains Al3+?

Explanation:

When a solution that contains [tex]Al^{3+}[/tex] reacts with ammonium sulfide solution, then a precipitate of aluminum sulfide is formed.

The chemical equation for the reaction is shown below:

[tex]3(NH_{4})_{2} S(aq)+2 Al^{3+}(aq) -> Al_{2} S_3} (s) +3 NH_{4}^{+}[/tex]

Answer:

(i) Protons, Neutrons

(ii) Mass number = 15

(iii) Atomic number = 12

(iv) Neutrons present in the atom = 17

(v) Nuclear symbol for the silicon isotope with mass number, A = 29 is ²⁹₁₄Si

Explanation:

(i) An atom is composed of three fundamental sub-particles: electrons, protons and neutrons. Electrons are found in orbits or energy levels some distance away from The nucleus of the atom. The nucleus of an atom contains the protons and neutrons which accounts for the mass of the atom.

(ii) The mass number of an atom of an element is the sum of the protons and neutrons present jn the nucleus of the atom.

The mass number of an atom of oxygen with proton or atomic number 8 and neutron number 7 is 8 + 7 = 15

(iii) Atomic number of an atom of an element is equal to the number of protons in the atom of the element.

Mass number = proton number + neutron number

Proton number = mass number - proton number

Proton number = 25 - 13 = 12

(iv) In the atom of sulfur represented bymthe symbol, the number in superscript is the mass number A, and the number in subscript is the atomic number Z.

Mass number = proton number + neutron number

Neutron number = Mass number - proton number

Neutron number = 33 - 16 = 17

(v) The nuclear symbol for the silicon isotope with mass number, A = 29 is ²⁹₁₄Si

Where the number in superscript is the mass number A, and the number in subscript is the atomic number Z.