Why were Democritus's ideas not science?

Answer:

Newtons Third Law

Explanation:

His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A.

Answer:

Just look up specific heat capacity of a certain element and it should give you the specific heat in the form of energy/mass×temperature i.e J/kg°C (joules per kilogram, and degrees celsius).

Answer: Earth is a part of this galaxy so the rest is not easily visible.

Explanation:

Milky Way consists of 200 billion stars, dust and gas. It solar system lies in the center of the galactic center. 20 light years above the plane of galaxy. The galactic center consists of huge number of stars which keep on rotating in the center. It is considered as a supermassive black hole. The planets also rotate in the galaxy. The earth is the part of the solar system which is the part of the galaxy. The earth is not visible in the galaxy so we cannot observe the entire galaxy from the earth.

Answer:

there is no change in mass

Explanation

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Decay of carbon-14 will forms a daughter nuclide with same mass by emitting the one beta. The resulting daughter nuclei have a lower mass and are lower in energy (more stable) than the parent nucleus that decayed.

The two general kinds of nuclear reactions are nuclear decay reactions and nuclear transmutation reactions. In a nuclear decay reaction, also called radioactive decay,

The radioactive decay of carbon-14 is as shown bellow

C¹⁴ → N¹⁴ + β−

The carbon-14 atoms undergo beta-minus decay and produce a beta particle and a nitrogen-14 atom.

Beta means, an electron.

The radioactive decay is also same as the normal reaction in organic, inorganic. Reaction is always follows the law of conservation of mass. Total mass of left hand side is equal to right hand side.

In radioactive decay, beta, gamma, alpha partical is the byproduct

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Answer:

0.5M is the answer.

Explanation:

1M solution is the solution containing 1mole solute dissolved per litre of solution.

Using unitary method,

1000cc gives 1M.

1cc gives 1/1000M.

500 cc gives 500/1000M=0.5M

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[tex]\bold{Meanings:}[/tex]

  [tex]1.)~Homogenous~-~Particles~distributed~uniformly,~(Evenly.)[/tex]

        [tex]\left[\begin{array}{ccc}O&o&O\\o&O&o\\O&o&O\end{array}\right][/tex]

[tex]2.)~Heterogenous~-~Particles~distributed~non~uniformly,~(Random.)[/tex]

       [tex]\left[\begin{array}{ccc}o&O&O\\O&o&o\\O&o&o\end{array}\right][/tex]

[tex]3.)~Colloid~-~This~mixture~is~made~up~of~particles~that~can~not~be~seperated.[/tex]  

______________________________

[tex]\bold{Answer:}[/tex]

[tex]\bold{Soil~is~considered~a~heterogeneous~mixture}\\\bold{becuase~there~are~so~many~compontents~that~make~up~soil,~and~none~}\\\bold{of~them~are~ordered~evenly.}\\\\\bold{So~your~answer~is~\boxed{C.}}[/tex]

______________________________

[tex]\bold{Hope~this~helps,}\\\bold{And~best~of~luck!}\\\\\bold{~~~-TotallyNotTrillex}[/tex]

Answer:

She has Saturn and Jupiter in the wrong order.

Explanation:

In the voltaic cell :

at the cathode ⇒reduction reaction

at the anode ⇒ oxidation reaction

We can see which metal is more reactive between Ag and Mg with voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

From the series , Mg more reactive than Ag, so that Mg undergoes an oxidation reaction and Ag reduction reaction

Half-reactions

cathode : Ag⁺ (aq) + e⁻ ⇒ Ag (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

So the answer for :

15. A. Ag⁺ (aq) + e⁻ ⇒ Ag (s)  (Reduction reaction)

16. C. Mg (s) → Mg²⁺ (aq) + 2e−  (Oxidation reaction)

17. A. the anode (oxidation reaction)

Answer:

there is only 1 significant figure in 100l

Answer: 5 atoms

Explanation:

Answer:

The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question.  In a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition

Hope this helped! :) Have a wonderful day/night!

Answer:

0.010285949393128987

Explanation:

I just used a conversion calculator

The concept of moles is a fundamental unit of measurement in chemistry that helps quantify the amount of a substance. There are approximately 10.28 moles of magnesium in 0.250 kg of Mg.

The mole (mol) is a unit used to express the number of entities, such as atoms, molecules, or ions, in a sample of a substance. One mole is defined as the amount of a substance that contains as many entities as there are atoms in exactly 12 grams of carbon-12.

The number of entities in one mole is known as Avogadro's number, which is approximately 6.022 x 10²³. This means that one mole of any substance contains approximately 6.022 x 10²³ entities.

To calculate the number of moles of magnesium (Mg) in 0.250 kg of Mg, we need to use the molar mass of magnesium and the given mass.

The molar mass of magnesium (Mg) is approximately 24.31 grams per mole (g/mol).

First, we need to convert the given mass from kilograms (kg) to grams (g):

[tex]0.250 kg * 1000 g/kg = 250 g[/tex]

Now we can use the molar mass to calculate the number of moles:

Number of moles = Mass (g) / Molar mass (g/mol)

[tex]=0.250 kg * 1000 g/kg = 250 g[/tex]

Therefore, there are approximately 10.28 moles of magnesium in 0.250 kg of Mg.

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Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus. It is the average weight of an element. It is the total number of nucleons in the atom's nucleus.

Explanation:

Hope this helps have a great day its kinda hard to put it in one sentence so uhh just read this and make it into one sentence  

Answer:

atomic number is equal to no.of protons or no.of electrons and no.of neutros+atomic num=atomic mass

Explanation:

in above give the correct explanation

Answer:

My answer would be

B.

Explanation:

Although helium is twice as heavy as (diatomic) hydrogen, they are both significantly lighter than air, making this difference negligible. The lifting power in air of hydrogen and helium can be calculated using the theory of buoyancy as follows: Thus helium is almost twice as dense as hydrogen.

Answer:

It is lighter.

Each organ system performs specific functions for the body, and each organ system is typically studied independently. However, the organ systems also work together to help the body maintain homeostasis. For example, the cardiovascular, urinary, and lymphatic systems all help the body control water balance.

Answer:

The metals list which makes up the periodic table includes iron, lead, gold, aluminum, platinum, uranium, zinc, lithium, sodium, tin, silver, etc.

Explanation:

Answer:

iron, lead, gold, aluminum, platinum, uranium, zinc, lithium, sodium, tin, silver

Explanation:

Answer:Silicon

Explanation:

Silicon - Element information, properties and uses | Periodic Table.

Royal Society of Chemistry › 14 › si...

Silicon - Element information, properties and uses | Periodic Table

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Answer:

b. source

Explanation:

The source is where something comes from. i.e. The source of sunlight is the sun.

Answer:

PLZ HELP ME. This is my second time posting my question because the first time a person put a random answer. If you do not know the question please do not answer it and leave it to someone else. Thank you, and my question is on the attached image below

Explanation:

PLZ HELP ME. This is my second time posting my question because the first time a person put a random answer. If you do not know the question please do not answer it and leave it to someone else. Thank you, and my question is on the attached image below.

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Answer:

1.6125 g/cm^3

Explanation:

Density= mass/volume

Answer:

The answer is 18.01528.

Explanation:

This compound is also known as Water or Dihydrogen Monoxide. The SI base unit for amount of substance is the mole.

Answer:

1) NaCl, 5)MgS

Explanation:

What makes something an Ionic Bond:

For 1) Na has a charge of 1+ and Cl has a charge of 1-. They both come together to form table salt. Their electronegativity is also larger than 2.0. Also Na is a metal and Cl ion is a nonmetal.

For 2) C and O are both nonmetals and are covalent bonds

For 3) Water is a polar covalent molecule because there is a electronegativity difference between H and O, but not great. H and O are also nonmetals.

For 4) While Fe is a metal and O is a nonmetal, their electronegativity difference is not greater than 2.0. This makes it polar covalent.

For 5) Mg is a metal and S is a nonmetal. They have a large electronegativity difference. Also Mg has a charge of 2+ while S has a charge of 2-.

Answer is A

At the bottom of the periodic table is a special group of metallic radioactive elements called actinides or actinoids. These elements, usually considered ranging from atomic number 89 to atomic number 103 on the periodic table, have interesting properties, and play a key role in nuclear chemistry.

The correct option is D. Group 14 are metalloids and they contain both metals and non metals.

The lowest class of elements, known as the metaloids, only has six members: the elements boron, silicon, germanium, arsenic, antimony, and tellurium (Te). Metalloids have both nonmetal and metal qualities, including the ability to conduct electricity (elements that cannot conduct electricity).

The majority of metalloids, for instance, may conduct electricity, though not as well as metals. Metalloids frequently have a metallic sheen but a nonmetal brittleness.

Depending on the quantity of valence electrons they contain, metalloids can behave chemically like metals or nonmetals.

Therefore, The correct option is D. Group 14 are metalloids and they contain both metals and non metals.

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1.distance

Explanation:

I hope it will help you

please mark me has brainlist

Answer:

option 4 - it can have different compositions, and it has a set of characteristics that change.

Mixture is defined to have different compositions, and it has a set of characteristics that does change.There are 2 types of mixtures:1) homogenous mixtures 2)heterogenous mixtures

Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

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Answer:

they determine what element it is, and what charge it will be.

Explanation:

the amount of neutrons determines the mass of the atom

the amount of protons determines the element of the atom

the amount of electrons determines the charge of the atom

Answer:

The amount of mass in a certain volume

Explanation:

Answer:

Density is mass divided by volume. Density is the determination of something floating or sinking.

Hope this helps!!!

Answer:

change of state only