2. How do the ancient Greek model and Ptolemy's model differ?

Answer:

a element

Explanation:

In science copper is a element. It is one of the transition metals found on the periodic table of elements.

Elements are distinct substances that cannot be split-up into simpler substances. Such substances consist of one kind of atom.

There are over a hundred elements that are known till date.

Each elements combines to form a compound

Answer:its an element

Explanation:

Answer:

The anwser to this problem is C :)

Explanation:

The compounds can be classified as C. as either reactants or products, depending on the rate that photosynthesis occurs.

Based on the information given, in the light-dependent reactions, light strikes the oval thylakoids. Also, as compound A enters the thylakoid, compound B leaves it, and compound C enters a cycle in the stroma, and sugars leave the cycle.

It can be deduced that the compounds can be classified as either reactants or products, depending on the rate at which photosynthesis occurs.

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Answer:

true

Explanation:

Answer:

This is true

Explanation:

if birthrate is higher than death rate then more babies= higher population

Answer:

Mechanical waves travel through matter, causing it to vibrate, expand and contract, move up and down, side to side, or in circles. They include water waves, sound waves, and seismic waves. ... They all travel at the same speed — the speed of light — in a vacuum, but when they come into contact with matter, they slow down.

Answer:

2KCl + F₂   →     2KF + Cl₂

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

2KCl + F₂   →     2KF + Cl₂

In this equation mass of reactant and product is equal. There are 2 potassium 2 chlorine and fluorine atoms on both side of equation it means mass remain conserved.

All other options are incorrect because mass is not conserved.

Mg₂ + LiBr ---> LiMg + Br

In this equation mass of magnesium is more on reactant side.

Na +O₂ ---> Na₂O

In this equation there is more oxygen and less sodium on reactant side while there is more sodium and less oxygen on product side.

H₂O ---> H₂ + O₂

In this equation there is less oxygen on reactant side while more oxygen on product side.

Answer:

B

Explanation:

Explanation:

double replacement is type of reaction of this.it is already balanced.

Answer:

1:2:1

Explanation:

i just think hai .its just a guess from my side...sorry if i m wrong...

Answer:

1:2:1

Explanation:

Hello person in the future. Good luck with your test and I hope you do great things with your life. You got this!! :D

Answer:

Seven electrons.

Explanation:

There are seven valence electrons in each fluorine atom because it belongs to halogens. Fluorine atom requires one electron to complete its valence shell to become stable so for that it form both ionic and covalent bonds with different atoms. It makes ionic bond with alkali metals by accepting one electron to complete its valence shell and also make covalent bond by sharing of electrons.

Answer:

D.

Explanation:

I did this question in school and got it right.

Answer:

The answer to your question is when the size, shape, or state of matter changes.

Explanation:

Change that does not undergo in the chemical composition.

Answer:

12.5%

Explanation:

Given data:

Volume/Volume % = ?

Volume of solute = 25 mL

Volume of solution = 200 mL

Solution:

Formula:

v/v% = ( volume of solute / volume of solution ) × 100

by putting values,

v/v% = ( 25 mL / 200 mL)  × 100

v/v% = 0.125  × 100

v/v% = 12.5%

Answer:

15 neutrons

Explanation:

Number of neutrons = atomic mass - number of protons.

So Neutrons = 28 - 13 protons

(Since atom is neutral, number of electrons = number of protons, which is how I get the 13 protons)

Neutrons = 15

Answer:

Newton's law also states that the strength of gravity between any two objects depends on two factors: the masses of the objects and the distance between them. Objects with greater mass have a stronger force of gravity between them.

Answer:

1. Volcanoes and minor earthquakes

2. Volcanoes, earthquakes and fold mountains.

3. Earthquakes and fold mountains.

4. Magma from volcanoes is filled with nutrients that makes land fertile.

Explanation:

Answer:

7 sublimation

8 freezing

9 melting

10 condensation

11 evaporation

Explanation:

Answer: Rate = 0.14 kg/s

Explanation: The Haber reaction is demonstrated below in the balanced equation

[tex]N_{2}+3H_{2}[/tex] → [tex]2NH_{3}[/tex]

To determine the rate of ammonia production, we need to determine the amount of nitrogen gas is being consumed.

As it is a gas, we can find moles by using Ideal Gas Law, whose formula is

PV = nRT

P is pressure

V is volume

n is moles

R is universal gas constant

T is temperature in Kelvin (K)

For the nitrogen gas, temperature will be

T = 273 + 17.2

T = 290.2 K

Solving for moles:

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{0.88(112)}{0.082(290.2)}[/tex]

n = 4.14 moles

In the Haber reaction, it is consumed 4.14 moles per second of nitrogen gas.

From the balanced equation, we know 1 mol of nitrogen gas produces 2 moles of ammonia, so

[tex]n_{NH_{3}}[/tex] = 2(4.14)

[tex]n_{NH_{3}}[/tex] = 8.48 moles

Number of moles (n) is mass in grams divided by molar mass of the compound:

[tex]n=\frac{m}{M}[/tex]

Molar mass of ammonia is M = 17.031 u, so mass produced is

m = n.M

m = 8.48(17.031)

m = 144.42 g

In kilograms, m = 0.14 kg

When consuming N₂ at a rate of 4.14 moles/s, it will be produced ammonia at a rate of 0.14 kg/s

Answer:

Adding heat and increasing concentration are meant to cause an increase in the rate of a reaction

Explanation:

The rate of a chemical reaction is defined as the number of moles of reactants converted or products formed pee unit time. It is a measure of how quickly the reactants in a given reaction are used up to form products or how quickly products are formed from reactants.

Factors that affect the rate of a chemical reaction include:

1. Nature of reactants

2. Concentration/pressure (for gases) of reactants

3. Temperature of reaction mixture

4. Presence of light

5. Presence of a catalyst

The effect of increasing the concentration of reactants for a given chemical reaction is that the reaction rate will increase. This is so because, according to the collision theory of chemical reactions, the frequency of collision between reactant particles which results in a chemical reaction (effective collisions) will increase when the reactant particles are crowded together in a small space due to an increase in their concentration.

The effect of increasing temperature or adding heat to a reaction is that the reaction rate increases. When the heat is added to a reactant particles, the number of particles with energies greater than or equal to the activation energy (the minimum amount of energy that reactant particles must possess for effective collisions) increases. Also, the average speed of the reactant particles increases resulting in a greater frequency of collision. Hence, the rate of the chemical reaction increases.

Answer:

Tetrahedral

Explanation:

SF2H2 is a derivative of the sulfuranes (SL4) compounds. The quantum mechanics of these sulfuranes is quite complicated.

Simply, they consist of ten electrons around the sulphur central atom one of which is a lone pair. The electronegativity of fluorine plays a key role in the structure and molecular geometry of SF2H2.

The molecule is found to be tetrahedral in shape by quantum mechanical calculations.

Answer:

C₆H₁₂O₆ + 6O₂ —> 6CO₂ + 6H₂O

Explanation:

Glucose (C₆H₁₂O₆) react with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O).

The equation can be written as follow:

C₆H₁₂O₆ + O₂ —> CO₂ + H₂O

The above equation can be balance as illustrated below:

C₆H₁₂O₆ + O₂ —> CO₂ + H₂O

There are 6 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 6 in front of CO₂ as shown below:

C₆H₁₂O₆ + O₂ —> 6CO₂ + H₂O

There are 12 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 6 in front of H₂O as shown below:

C₆H₁₂O₆ + O₂ —> 6CO₂ + 6H₂O

There are a total of 8 atoms of O on the left side and a total of 18 atoms on the right side. It can be balance by 6 in front of O₂ as shown below:

C₆H₁₂O₆ + 6O₂ —> 6CO₂ + 6H₂O

Now, the equation is balanced.

Which group of elements is considered the most reactive non-metals?

D. Noble Gases

The halogens will be considered the most reactive non-metals.

The halogens are just a group of 4 - 6 individual  elements in a particular periodic table.

A nonmetal is just a chemical element which lacks the majority of properties associated, ranging from colorless gases to gleaming, high-melting-temperature  of the solids.

Each outer shell includes seven electrons, hence group 7 metals would have to gain 1 extra electron to achieve a full outer shell of electrons. When we proceed up the group, this allows us to draw one electron, making it much more reactive.

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Answer:I think it’s 70 her speed

Explanation: What I did was divid 1,750/25 and it got me 70

Answer:

Strike-Slip Fault

Explanation:

The scientist observes strike slip fault feature when rock masses that have moved past each other in opposite horizontal directions.

The feature that the scientist observes when rock masses move past each other in opposite horizontal directions is a strike-slip fault.

A strike-slip fault is a type of fault in which two rock masses slide past each other horizontally in opposite directions. This type of fault is caused by shearing forces, which cause the rock masses to move sideways against each other.

As a result, the rocks on either side of the fault can move in different directions, creating an offset in the landscape. Strike-slip faults can occur in various settings, including transform plate boundaries, where two tectonic plates slide past each other, and in areas of high seismic activity, where the Earth's crust is under a lot of stress.

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Answer:

the mass numder of atoms is called atomic mass

Answer:

Green.

Explanation:

Only the particles that hit the nucleus of the atom bounced off.

Answer:

Mitochondrion

Explanation:

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