Identify the following examples as either physical or chemical change.
(Ill give brainliest if right)

Answer:

electrons

Explanation:

since they are at the outer part of nucleus

Answer:

Weakly

Explanation:

Being farther from the nucleus and with more electrons shielding the protons results in the valence electrons being held weakly.

Explanation:

Omg How Am I supposed to get the answer tell me what to do

Explanation:

Density is an intensive property of any matter. Any given pure sample of a substance will have the same density value.

Density is the mass per unit volume of a compound;

  Mathematically;

    D = [tex]\frac{M}{V}[/tex]  

where M is the mass

          V is the volume

          D is the density

Answer:

See explanation

Explanation:

The question is incomplete but i will try to answer it to the best of my ability.

An element of configuration  2.8.6 is in group 16. This element will form a divalent anion Z^2-

Z is a nonmetal which combines with metals to form ionic bonds. Z can also react with other non metals to form covalent compounds.

Z is expected to have high electronegativity and electron affinity since it is a nonmetal of group 16.

The oxides of Z will dissolve in water to yield acidic solutions.

Answer:

positive

Explanation:

Answer:

Positive feedback is a type of feedback in which a system is triggered to produce an output.

Explanation:

Have a great rest of your day
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Answer:

Yes, NaNO3 is the formula for sodium nitride.

Answer:

10=CaF2

11=Na3N

12=MgCl2

Explanation:

Answer:

10. CaF2

11. Na3N

12. MgCl2

Explanation:

Answer:

B

Explanation:

when  you increase the pressure of a closed container , its volume decreased.

in general  when pressure is increased, rate of reaction is increased.

Answer:

Explain your answer. mg2+ would be the smaller ion this is because each ion has the same number of electrons however mg2+ has a greater number of protons and therefore is more charge dense and the outer electrons feel a greater pull from the nucleus.

Hope this helps, have a great day/night, and stay safe!

Answer:

Ionization

Melting

Vaporization

Explanation:

▶Ioniztion changes the charge of an electron,  this usually happens between a chemical reaction. It takes a small amount of energy. Most of the time energy is absorbed instead of expelled!

▶ Melting changes the shape of the item and takes about 334 Joules/gram of energy.

▶ Vaporization changes the state of matter that the item is in and  requires 2260 Joules/gram.

Brainliest is much appreciated! Hope I helped!

Answer:

Compression is common at convergent boundaries, tension in divergent boundaries, and shear at transform boundaries.

Explanation:

The three main types of stress go along with the three types of plate boundaries. Rocks can bend and fold. Rocks can also fracture and break.

Answer:

That means that the isotope that has a mass number of 28 is probably the most abundant. This is because your average atomic mass is 28.086 amu, which is closest to 28.

Formula used to calculate average atomic mass follows:

average atomic mass=(atomic mass of an isotope)*(fractional abundance)

we are given=

Three isotopes of Silicon, which are Si-28, Si-29 and Si-30.

Average atomic mass of silicon = 28.086 amu

As, the average atomic mass of silicon is closer to the mass of Si-28 isotope. This means that the relative abundance of this isotope is the highest as compared to the other two isotopes.

Percentage abundance of Si-28 isotope = 92.2%

Percentage abundance of Si-29 isotope = 4.7 %

Percentage abundance of Si-30 isotope = 3.1%

Hence, the abundance of Si-28 isotope is the highest as compared to the other isotopes.

Answer:

Energy is required to break bonds in a molecule and released when bonds are made.

Explanation:

Energy is added to break bonds and released when making bonds.

Answer:

chemical

Explanation:

Some bronze objects tarnish to a dark brown color. Chemical properties can be identified by the changes they produce. The change of one substance into another substance is called a A piece of wood burning, an iron fence rusting, and a silver spoon tarnishing are all examples of chemical changes.

Answer:

[tex]23.32\ \text{days}[/tex]

Explanation:

N = Final mass of atom = 125 g

[tex]N_0[/tex] = Initial mass of atom = 16000 g

t = Time taken = 163.24 days

[tex]t_{1/2}[/tex] = Half life

We have the relation

[tex]N=N_0\dfrac{1}{2}^{\dfrac{t}{t_{1/2}}}\\\Rightarrow 125=16000\times \dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \dfrac{125}{16000}=\dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \ln0.0078125=\dfrac{163.24}{t_{1/2}}\ln0.5\\\Rightarrow t_{1/2}=\dfrac{163.24\times\ln0.5}{\ln0.0078125}\\\Rightarrow t_{1/2}=23.32\ \text{days}[/tex]

The half life of the atom is [tex]23.32\ \text{days}[/tex].

Answer:

Covalent bonding

Explanation:

covalent bonding

Answer:

D They have the same properties.

Explanation:

The same no. of isotopes doesnot describes because isotopes have same symbol but didderent atomic mass.

Answer:

B

Explanation:

Answer: 45

Explanation:

mass number = number of protons and neutrons

atomic number = number of protons

to find neutrons subtract atomic number from mass number

so 80 - 35 = 45 neutrons

Answer:

B

Explanation:

Heating a piece of iron until it glows.

Heating a piece of iron until it glows causes a physical change in the shape of an object. Therefore, option B is correct.

The term physical change is define as a type of change where the physical properties of matter change. In physical change, composition and chemical nature of matter does not change.

It involves in change in physical properties. The examples of physical changes are textural change, shape, size, color, volume and density.

Heating a piece of iron until it glows causes a physical change in the shape of an object, because it involves physical property. The changes in which only physical properties of substances are changed, and no new substance is formed

Thus, option B is correct.

To learn more about the physical change, follow the link;

https://brainly.com/question/3680148

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Answer:

Por ejemplo, el Litio se ubica en el grupo 1A, entonces tiene 1 electrón de valencia.

Explanation

Excepto los grupos 3-12 (los metales de transición), el dígito de las unidades del número de grupo identifica cuántos electrones de valencia se pueden asociar con un átomo neutro de un elemento listado en dicha columna.E

Answer:

Explanation:

The number of atoms of potassium can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 1.65 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

A. They contain older stars and less gas and dust.

Explanation:

There are three types of galaxies:

Elliptical galaxies are galaxies shaped like an ellipse, while spiral galaxies consist of a flat, rotating disk that contains stars, gas, and dust, and a central concentration of stars called the bulge.

The difference between elliptical and spiral galaxies is in the amount of gas and dust they contain. Spiral galaxies contain large amounts of gas and dust, which means that new stars are born very often. This makes them brighter than relatively dim elliptical galaxies, which contain less gas and dust. This is why fewer new and brighter stars are born in elliptical galaxies, leaving them with older, dimmer stars.

Answer:

Negative Ions

Explanation:

Nonmetals naturally form Negative Ions by gaining electrons to fill the valence shell

Answer: Reacting 12 g of C with 32 g of O2 to form 44 g of CO2

Explanation: I took the test just now, and the law of conservation of mass means to energy and that is exactly what they do in this answer!  

Answer:

A

Explanation:

Answer; molecule

Explanation: