pliz answer 1 & 2 .... I'll tag best answer brainliest .... no spamming ​

Explanation:

Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.

Answer:

A because even if its a minor cut, it's always a better choice to inform someone.

Answer:

Explanation:

Answer:

water: H2O,

carbon dioxide: CO2

oxygen:O₂

hydrogen: H2

Explanation:

Explanation:

Chlorine is a non metal so covalent bond. KBr has K metal and Br non metal of opp. charges so ionic bond. Na is a metal so ionic bond. NaCl has Na as metal and Cl as a non metal so ionic bond.

D is incorrect

Answer:

Valence Shell

Explanation:

Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons.

Answer:-

the central part of an atom compsed of protons and neutrons.

Mashing two marshmallows together can be an appropriate model to explain nuclear fusion.

Nuclear fusion is the reaction that occurs when two or more light elements combine to form heavier elements with the release of energy.

Nuclear fusion reactions occur mainly in the production of stars and the main-sequence star, The Sun by the fusion of hydrogen nuclei into helium.

Therefore,The following  cannot be a model of Nuclear fusion, because they do not follow the basic concept of nuclear fusion which two light nuclei react to form a single heavy nuclei.

Marshing two marshmallows together can be a good model to explain nuclear fusion because it follows the basic concept of nuclear fusion

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Answer:

mashing two marshmallows together

Explanation:

i've taken the test

Answer:

..

...

....

Explanation:

hop it helps.....

Answer:

identify two ways in which carbon-12, carbon-13, and carbon-14 are alike. they each have 6 protons and neutrons and they're all carbon atoms. what is a chemical compound?

Answer:

transmission clutches

Since we are starting from the number of atoms of Sulfur, we need to know two sets of formulas:

        ⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

  mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)  

            = 107.01 g

The molar mass of sulfur S is 32.06 g/mol, then the mass in grams of a sample of S containing 2.01x10^24 atoms  is 107.01 g

The molar mass can be defined as the weight of one sample mole, by Multiplying  the subscript means  the number of atoms times that element’s atomic mass and add the masses of all the elements in the molecule to obtain the molecular mass.

Molar mass is  expressed in either gram ( g) or kilograms (kg).

Mass  = moles × molar mass

moles = atoms ÷ Avogadro's Number

       ⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

 mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)  

          = 107.01 g

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Answer:

Answer is the third one

Explanation:

All living organisms are made up of one or more cells, which are considered the fundamental units of life. Even unicellular organisms are complex! Inside each cell, atoms make up molecules, which make up cell organelles and structures.

Answer:

Nonbiodegradable substance

Selectivity is relatively easy to alter, with mobile phase composition and stationary phase being the primary means of adjustment. The hydrophobicity, polarity and nature of the chosen stationary phase all play a crucial role in analyte interaction and directly affect the selectivity of a separation.

In chromatography, it is important to select a good stationary phase so as to ensure proper separation of components.

Chromatography is a separation technique which is generally used for separating substances based on their solubilities. The technique makes use of two phases the mobile phase and the stationary phase.

The components are separated from each other based on their solubility in the mobile phase. Component which is least soluble does not travel along the mobile phase while component which is highly soluble travels with the mobile phase.

The difference in the solubility of the components is measured with the reference to the solvent front and is expressed in terms of Rf value.Chromatography finds application in forensics, separation of organic compounds,etc.

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Answer:

a. Calcium: [Ar]4s^2

or 1s^2 2s^2 2p^6 3s^2 3p^6 (= Argon) 4s^2

b. Xenon

c. Zinc

d. Carbon

Explanation:

Group 2A = Alkaline Earth; period 4 shows that the element will be calcium.

To write the Electron Configuration we remember that Columns 1&2 and Helium represent the s-orbital which holds a maximum of 2 electrons. Columns 13 through 18 fill the p-orbital.

According to the forces of attraction , ice is a solid which will melt under applied pressure.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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2 moles of HCl solution reacts with one mole Calcium Hydroxide

Ca

(

O

H

)

2

One mole of HCl has mass : 36.5 g/mol, two moles of HCl will have mass, 73 g.

One mole of Ca

(

O

H

)

2

has mass 74.1 g

as per equation; 73 g of HCl reacts with 74.1 g of Ca

(

O

H

)

2

1g of HCl reacts with 74.1g / 73 of Ca

(

O

H

)

2

1g of HCl reacts with 1.015 g of Ca

(

O

H

)

2

Answer:

i think it would be answer D

Explanation:

Answer:

As shown in the attachment,

Explanation:

The example of a unicellular organism is amoeba

Answer:

Nice experiment

Explanation:

Answer:

B. Saliva breaking down molecules in the mouth

Explanation:

I'm pretty sure it's this because saliva contains enzymes and enzymes use chemicals to break down food in your mouth. For example, your mouth has an enzyme called amylase which helps to break down starches.

Answer:

B. Saliva breaking down molecules in the mouth

Explanation:

I'm pretty sure it's this because saliva contains enzymes and enzymes use chemicals to break down food in your mouth. For example, your mouth has an enzyme called amylase which helps to break down starches.Explanation:

Answer:

ELECTRONEGATIVITY is the tendency of an atom in the molecule to attract the bonded pair of electrons .

Explanation:

it might help you!!!!!!

Answer:

the relative strength with which an element attracts electrons in a chemical bond

Explanation:

Answer:

They all have the same density

Explanation:

Density is an intensive physical property, meaning that as long as the chemical formula is the same, that specific intensive physical property will be the same. For example. One kilogram of feathers has the same mass as one kilogram of bricks. Why? They both have a mass of one kilogram.

It's the same thing here. Since all the objects are (assumed to be) made up of 100% gold, they would all have the same density regardless of the mass. For extra points, say the density of each object is [tex]19 \frac{g}{cm^3}[/tex].

Answerthey all have the same density Explanation:

Answer:

Total of 4 isomers of hepta-2,4-diene are given

Explanation:

pls mark brainliest

hope this helps  <3

Answer:

Postulates of Dalton's Atomic Theory:

1) Atoms can neither be created nor destroyed.

2) During chemical reaction, atoms combine or separate or re-arrange. They combine in simple ratios.

3) All elements are composed of the indivisible particles called atoms.

4) Atoms of a particular element are identical. They have the same mass and volume.

Postulates of modern atomic theory:

1) All matter is composed of atoms.

2) Atoms consist of protons, electrons and neutrons.

3) Atoms of an element may differ in masses. (as in isotopes)

4) The ratio in which elements combine may not be simple.

Similarities:

1) All elements/matter are/is composed of atoms.

2) Atoms can neither be created nor destroyed.

3) During chemical reactions, atom combine or separate or rearrange.

Differences:

1) Dalton's theory said that atoms are indivisible particles but modern theory denies it and calls atom a divisible particle consisting of sub-atomic particles, protons, electrons and neutrons.

2) Dalton's theory said that atoms of the same element have same mass and volume but according to modern theory, it is said that atoms of the same element can differ in mass (as in isotopes).

3) Dalton said that atoms combine in simple ratio but modern theory denies it.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

i think the answer is B. scientists used evidence, analysis, and experiments to disprove Alchemy. apologies if its incorrect.

Answer:

12. A

13. A

14. D

15. B

Explanation:

12. The 3rd law of motion is the force of our object being equal and opposite the other. If the Buller goes forward with force, the the gun recoils backwards with the same force.

13. There's nothing else described in the problem besides him getting kicked in the face

14. If you mive the oars forwards then the boat itself moves backwards

15. The gas helps push the rocket upwards since it goes downwards.