The Nebular Theory explains the formation of:

A). only planets

B). galaxies

C). the Universe

D). a Star and orbiting planets

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 45 × 1544

We have the final answer as

Hope this helps you

Answer:

69,480 kg. m/s

have a nice day!

Answer:

25% XX

50% Xx

25% xx

Explanation:

see picture

Answer:

Your answer is B : 25% :)

Explanation:

B's correct on Edg for me.

Answer:

Building artificial reefs and limiting fishing activity

Explanation:

The only activity that can successfully increase the natural biodiversity of fishes in the area would be building artificial reefs and limiting fishing activities.

The building of artificial reefs would create several microhabitats for fishes to thrive while limiting fishing activities would ensure that the rate of thriving or multiplication of fishes far outweighs the rate fishes are being removed from the area. Both actions will work synergistically to increase the natural biodiversity of fishes in the area.

The introduction of non-native species can have a negative consequence for the area as non-native species have a history of reducing biodiversity by outcompeting the native species and becoming invasive.

Building artificial reefs and increasing fishing activities would be counterproductive. While artificial reefs can increase the thriving of fishes, increasing fishing activities would take away the gains of the artificial reefs.

Eliminating non-native species and encouraging fishing for large predatory fish will disrupt the ecological balance of the area and might have negative effects on biodiversity.

Answer:

Magnesium also reacts with nitrogen in the air to produce some magnesium nitride (Mg3N2). Safety: Do not look directly at the burning magnesium due to the intensity of the light. A dry-powder fire extinguisher should be available. Disposal: Once cooled the solid magnesium products can be thrown in the trash.

Explanation:

Answer:

Number of protons = 16

Number of neutrons = 16

Number of electrons = 18

Explanation:

The atom given is (32,16)S_2.

This simply Sulphur atom.

What (32,16)S_2 implies is that;

Atomic number = 16

Mass number = 32

Now atomic number means number of protons present in the atom

While mass number means number of sum of protons and neutrons present in the atom

Thus;

Number of protons = 16

Number of neutrons = 32 - 16 = 16

Now, for a neutral atom, number of protons is equal to number of electrons.

However, in this case it's not neutral but has a charge of -2.

Thus,

Number of electrons = 16 + 2 = 18 electrons

Answer:  C. 6

Explanation:

According to the Law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction for photosynthesis is :

[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O+energy[/tex]

Thus the coefficient of water is 6.

Answer:

Decrease the distance between them or increase the mass.

Explanation:

F= GM1M2/ R²

Answer:

decrease the distance between the objects

Explanation:

i did the test and got da epic 100 score

Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

From the question we have

[tex]P_2 = \frac{5 \times 1200}{2000} = \frac{6000}{2000} = \frac{6}{2} = 3 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

B- shield

Explanation:

C IS NOT CORRECT.

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Answer: B shield

Explanation:

Answer:

Mass = 547.02 × 10⁻²³g

Explanation:

Given data:

Number of atoms of Al = 122 atom

Mass in gram = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

122 atom/6.022 × 10²³ atoms ×  1 mol

20.26× 10⁻²³ mol

Mass in gram:

Mass = number of moles  × molar mass

Mass = 20.26× 10⁻²³ mol  × 27 g/mol

Mass = 547.02 × 10⁻²³g

Answer:

A 65-kg object and an 75-kg object.

Explanation:

The gravitational force is given by :

[tex]F=G\dfrac{m_1m_2}{r^2}[/tex]

F is directly proportional to the product of masses and inversely to the distance between them.

In this problem, the distance separating the objects is same for each pair. We need to find the greatest gravitational force between them.

(1) a 50-kg object and an 80-kg object

[tex]F_1=G\dfrac{4000}{r^2}\ N[/tex]

(2) a 65-kg object and an 65-kg object

[tex]F_2=G\dfrac{4225}{r^2}\ N[/tex]

(3) a 65-kg object and an 75-kg object

[tex]F_3=G\dfrac{4875}{r^2}\ N[/tex]

(4) a 60-kg object and an 70-kg object

[tex]F_4=G\dfrac{4200}{r^2}\ N[/tex]

From the above calculations we find that if the product of masses is maximum, it lead to maximum gravitational force between objects. Hence, a 65-kg object and an 75-kg object will have maximum gravitational force between them.

Answer:

I only know 3 its 0 N because 10-8=2 and 2-2=0

Explanation        10-8=2 2-2=0

Answer:

The third option "A molecule of a compound is composed of at least two types of atoms" is correct

Explanation:

This question isn't about molecules, it's about elements and compounds.

Elements are made of one and only one type of atoms, while compounds are made of more than one type of atoms.

(Molecules are just groups of atoms, it doesn't matter what they're made of)

Answer:

a

Explanation:

Answer:

The answer is A

Explanation:

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The force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.

Force is defined as a push or pull upon any object resulting from the object's interaction with another object. It is a vector quantity.

Force can also be defined as an external cause that, when applied, changes or tends to change the state of the body, if the body is in motion.

Force is expressed as

Force = mass x acceleration

There are five types of force

Digestion is define as the breakdown of food into smaller component  that can be absorbed into blood streams.

Thus, the force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.

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Answer:

Li2SO4

Explanation:

Balance the reaction of Li3PO4 + MgSO4 = Li2SO4 + Mg3(PO4)2 using this chemical equation balancer!

The mass of FeS formed : 11.97 g

Reaction

Fe(s) + S(s) → FeS(s)

mass Fe=7.62 g

mol Fe(MW=56 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{7.62}{56}\\\\mol=0.136[/tex]

mass S=8.67 g

mol S(MW=32 g/mol) :

[tex]\tt mol=\dfrac{8.67}{32}=0.271[/tex]

Limiting reactant : smaller ratio(mol:coefficient) ⇒coefficient=1

Fe : S =0.136 : 0.271⇒Fe limiting(smaller), S excess

Mol FeS based on Fe , so mol FeS=0.136

Mass FeS(MW=88 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=0.136\times 88=11.97~g[/tex]

Answer:

Both have a definite mass and volume, but only the frozen Ice cube has definite shape

Explanation:

Water(Liquid) Takes on the forms of other things, Such as cups

Answer:

Translation: Air resistance is a force that is caused by air. The force acts in the opposite direction to an object moving through the air.

Data are characteristics or information, usually numerical, that are collected through observation. In a more technical sense, data are a set of values of qualitative or quantitative variables about one or more persons or objects, while a datum (singular of data) is a single value of a single variable.

a physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.

Answer:

thermal conductivity: the rate at which heat is transferred by conduction through a unit cross-section area of a material, when a temperature gradient exits perpendicular to the area

electrical conductivity: the measure of the amount of electrical current a material can carry or it's ability to carry a current

solubility: the ability to be dissolved, especially in water

magnetism: a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects

melting point: the temperature at which a given solid will melt.

boiling point: the temperature at which a liquid boils and turns to vapor

Explanation:

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The concentration of hydrogen ion of a sample of vinegar : 1.514 x 10⁻⁷

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.

A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.

pH = - log [H⁺]

pH of a sample vinegar = 6.82

The concentration of hydrogen ion :

[tex]\tt 6.82=-log[H^+]\\\\(H^+]=10^{-6.82}=1.514\times 10^{-7}[/tex]

Answer:

electron, proton, nucleus, atom, molecule teacher

Answer:

If this anwser helped you mark it the brainest please

Explanation:

Properties are features, qualities or characteristics of an item. Properties shall be used to classify the components. Properties are the attributes of a material that separates it from another substance. These properties are called physical properties and chemical properties in chemistry.

Answer:

490. g H₂SO₄

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

3.01 × 10²⁴ molecules H₂SO₄

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of H - 1.01 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol

Step 3: Convert

[tex]3.01 \cdot 10^{24} \ molecules \ H_2SO_4(\frac{1 \ mol \ H_2SO_4}{6.022 \cdot 10^{23} \ molecules \ H_2SO_4} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 490.287 g H₂SO₄

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

490.287 g H₂SO₄ ≈ 490. g H₂SO₄

Answer:

A

Explanation:

I believe the answer is A. An object is every color except the color we see, or the color that bounces off of said object. Therefore if a carpet is yellow, the carpet is every color but yellow. Yellow is the color that it rejects, bounces off of it, and the one we see.

To solve this we must be knowing each and every concept related to reflections. Therefore, a pair of jeans look blue because  it reflects blue light.

In physics, reflection usually described as a change in the orientation of a waveform at the interface of two distinct media, bouncing the waveform back onto the original medium.

The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. A pair of jeans look blue because  it reflects blue light.

Therefore, a pair of jeans look blue because  it reflects blue light.

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Answer:

The solutions are most likely hydrogen peroxide since it is the compound of hydrogen and oxygen that has a ratio of Hydrogen to Oxygen ratio of 1 : 1.

Note:The question is not complete.

Explanation:

The empirical formula of the two compounds are determined

Solution in beaker A:

Mass of Hydrogen = 4.425 g

Moles of hydrogen = reacting mass/molar mass = 4.425 g / 1 g/mol = 4.425 moles

Mass of oxygen = 70.575 g

Moles of oxygen = reacting mass/molar mass = 70.575 g / 16 g/mol= 4.411 moles

Mole ratio of Hydrogen to Oxygen = 4.425 : 4.411

Simplest mole ratio = 1 : 1

Therefore, empirical formula of solution in A = H₁O₁

Solution in beaker B:

Mass of Hydrogen = 7.38 g

Moles of hydrogen = reacting mass/molar mass = 7.38 g / 1 g/mol = 7.38 moles

Mass of oxygen = 117.6 g

Moles of oxygen = reacting mass/molar mass = 117.6 g / 16 g/mol= 7.35 moles

Mole ratio of Hydrogen to Oxygen = 7.38 : 7.35

Simplest mole ratio = 1 : 1

Therefore, empirical formula of solution in B = H₁O₁

The solutions in beakers A and B have the same empirical formula. Their molecular masses are not given, so their molecular formula is not certain. However, the solutions are most likely hydrogen peroxide since it is the compound of hydrogen and oxygen that has a ratio of Hydrogen to Oxygen ratio of 1 : 1.

Answer: A. 5.41

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} Al=\frac{2.50g}{27g/mol}=0.0926moles[/tex]

[tex]\text{Moles of} Pb(NO_3)_2=\frac{8.65g}{331g/mol}=0.0261moles[/tex]

[tex]2Al(s)+3Pb(NO_3)_2(aq)\rightarrow 3Pb(s)+2Al(NO_3)_3(aq)[/tex]  

According to stoichiometry :

3 moles of [tex]Pb(NO_3)_2[/tex] require  = 2 moles of [tex]Al[/tex]  

Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] will require=[tex]\frac{2}{3}\times 0.0261=0.0174moles[/tex]  of [tex]Al[/tex]

Thus [tex]Pb(NO_3)_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al[/tex] is the excess reagent.

As 3 moles of [tex]Pb(NO_3)_2[/tex] give = 3 moles of [tex]Pb[/tex]

Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] give =[tex]\frac{3}{3}\times 0.0261=0.0261 moles[/tex]  of [tex]Pb[/tex]

Mass of [tex]Pb=moles\times {\text {Molar mass}}=0.0261moles\times 207g/mol=5.41g[/tex]

Thus 5.41 g of solid lead will be produced from the given masses of both reactants.