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

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

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

[tex]n = \frac{3.612 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]

We have the final answer as

Hope this helps you

Answer: True.

Explanation:

Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol. For example, the atomic mass of titanium is 47.88 amu or 47.88 g/mol. In 47.88 grams of titanium, there is one mole, or 6.022 x 1023 titanium atoms.

The characteristic molar mass of an element is simply the atomic mass in g/mol. However, molar mass can also be calculated by multiplying the atomic mass in amu by the molar mass constant (1 g/mol). To calculate the molar mass of a compound with multiple atoms, sum all the atomic mass of the constituent atoms.

For example, the molar mass of NaCl can be calculated for finding the atomic mass of sodium (22.99 g/mol) and the atomic mass of chlorine (35.45 g/mol) and combining them. The molar mass of NaCl is 58.44 g/mol.

Answer: Determination of Equilibrium Constant, Determination of Solubility Products, Determination of pH, Determination of Activity Coefficients,

Explanation:

Answer:

u didnt attach an image or anything so this is quite confusing.

Explanation:

??

Answer:

Okay

Explanation:

Answer:

Experiment Question, Independent & Dependent Variable, Null & Alternate Hypothesis

Explanation:

Experiment Question : Whether fine cloth coverage over chicken jars effect flies & their eggs in ambience ?

Independent Variable : The causal variable, ie cloth cover existence on the chicken jar

Dependent Variable : The resultant variable, ie presence of flies & their eggs near jar, meat

Null Hypothesis [H0] : Cloth cover on chicken jar doesn't effects flies' & eggs' presence around jar, chicken.

Alternate Hypothesis [H1] : Cloth cover on chicken jar effects flies' & eggs' presence around jar, chicken.

Answer:

Dana filtered the sample and larger granules of the sample were left behind.

Explanation:

If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.

One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.

Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.

Explanation:

molecular formula

....

Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas. Therefore, option D is correct.

A chemical formula lists the elements that comprise the compound as well as the number of atoms of each element in the compound's smallest unit, whether a molecule or a formula unit. Knowing the elements' names and a few basic rules allows us to name simple compounds given a chemical formula.

Chemical formulas are classified into three types: empirical, molecular, and structural.

Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.

Thus, Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas, option D is correct.

To learn more about the chemical formula, follow the link;

https://brainly.com/question/29031056

#SPJ6

90 grams. When the state of an object changes, the mass doesn’t change.

*edited*

Answer:

Explanation:

The mass of the object can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{180}{4} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

I am so sorry but I need pts...

Explanation:

Answer: Acceleration

Explanation:

Acceleration.  The rate of change of an objects velocity is essentially the derivative of the velocity which is acceleration

Explanation:

The dangers of ballooning were apparent to aeronauts and the general public. From the early 1800s, attempts to fly over water too often ended in disaster or a narrow escape. Some of the best known aeronauts on both sides of the Atlantic set off across a large body of water never to be seen again.

Answer:

The time of heating

Explanation:

Let us analyse the experiment closely; the temperature of the liquid increases as the time of heating increases. This implies that the temperature of the liquid is dependent on the time of heating of the liquid. The longer the time of heating, the greater the increase in temperature until the boiling temperature is eventually attained.

Hence, the temperature of the liquid is the dependent variable, the time of heating is the independent variable when the heating rate is held constant.

Answer:

The error of an experiment is the difference between the experimental and accepted values. If the experimental value is less than the accepted value, the error is negative. If the experimental value is larger than the accepted value, the error is positive.

Explanation:

I hope that helped if it did mark me brainlest! i really need it :(

Answer:

I'm Pretty Sure It Would Be C

Answer:

C it is yeah...°∆°

Explanation:

......

Answer:

There is on reason why...

Explanation:

This is one reason astronomers and other scientists use scientific notation when working with very large or very small numbers. Scientific notation is a system for writing and working with numbers that makes it much easier to deal with numbers that are very small or very large.

There you go your awnser

Answer : C. A hydrogen bond

Explanation:

Answer:

A. covalent bond

Explanation:

dipole-dipole interaction results from difference in electronegativity , eg H-F where Fluorine has strong electronegativity but Hydrogen has less electronegativity. hence the bond has dipole moment towards F atom.

12.8 g

(Don’t have explanation but it is right on CK-12)

The name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecule is called Unshared pair

Unshared pair of electrons are also called Free radicals, lone pair or non bonding pairs, they refer to electrons that do not take part in covalent bonding of molecules.

Unshared pair together with shared pair occupy the  valence electron shell and make up the valence electrons.

Diatomic oxygen molecule has 4 pair of unshared electrons

See more here: https://brainly.com/question/15451932

Answer:

Protons and neutrons

Explanation:

The particles to forms the nucleus of an atom are the protons and neutrons of the atoms.

These materials are located in the tiny nucleus and contributes the most mass of the atom.

There is differ motion you go through the day translational, rotational, periodic, and non periodic motion.

Hope this helped you

Sorry if it wrong

Answer:

c

Explanation:

Sunlight heating the sand on the beach on a hot summer day is an example of radiation which is electromagnetic radiation.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

Learn more about electromagnetic radiation,here:

https://brainly.com/question/10759891

#SPJ6

Answer:Nonmetals and rubber

Explanation: hope this helps

Answer:

phosphorus

Explanation:

non-metals are poor conductors

Answer:

Answer. Answer: The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.

Explanation:

Answer:

ME AND YOU HAVE THE SAMEEEE USER BUT LOOK

The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.

Explanation:

Answer:

Volume

Explanation:

yo brother these are so easy, just study bro. I helped you answer 3 already lol

whatever.

Hope I helped :)

Answer: A

Explanation: Potassium is a metal.

Answer: Crocodile is a reptile whereas sheep and gorilla are the mammals.

Explanation:

Crocodile, sheep, and gorilla have alimentary canal in their digestive system. The urea is the common excretory waste.

Mouth is typically large in case of crocodile and comparatively small in sheep and gorilla.

In crocodile more sharp teeth are present as compared to sheep and gorilla for mastication of food and capturing the prey like fish or large animals like zebra.

The crocodile palate is more stronger than sheep and gorilla because it enable it to chew the bones of the prey.

Do you go to Millbrook? 23.9kPa

Answer:

The number "1.25" is already at a number that shouldn't be determined using scientific notation. Do you want 1.25ml----> liters ? If so, here

Explanation:

1.25 × [tex]10^{-3}[/tex]

is the amount of liters

Hope this helps!

Have a nice day!

If you find my answer helpful

Pls consider marking my answer as Brainliest! It would mean a lot!

Answer:

Explanation:

decompostion reaction