I need help fast...........

Answer:

B.Mendeleev

Explanation:

I think this is right

Answer:

velocity

Explanation:

"Speed is a measure of the distance an object travels per unit of time."

Answer:

Explanation:

1 Calorie = 4184 Joules

450 Calories = 450 x 4184 J

= 188.28 x 10⁴ J

3.5 x 10⁶ joules

4184 joules = 1 Calorie

3.5 x 10⁶ joules = 836.52 Calories.

Answer: Option (C) is the correct answer.

Explanation:

When electrons between two combining adjacent atoms attain positions which leads to the formation of temporary charges over the atoms then there exists a temporary adjacent force called London dispersion force.

This force is also known as induced dipole-induced dipole attraction.

When the temperature is lowered to a certain point then London forces causes the non-polar substances to condense to liquid and then they freeze into solids.

Answer:

It's an element.

Explanation:

Au is gold. An "element " on the periodic table. Trust me. Im 100% sure.

Explanation:

gold is an element

{au 79 is the atomic number}

Answer:

Radiology departments in hospitals use x-rays, MRIs, CT scans, etc. on a daily basis, meaning they are heavily exposed to radiation without protective equipment, and said exposure can cause cancer down the line and shorten their life significantly. To prevent this from happening, they give the radiologist (and the patient) with equipment with lead (and other materials) which reflects or absorbs the radiation from these scans, including shoes with special soles. These shoes are most likely worn due to the radiation left in the scanning room floors after scans. Radiologists also go to a special room with heavy radiation protection where they can activate and monitor the scan.

Answer:

Describes its potential to undergo some chemical change or reaction by virtue of its composition

The mass of Nickel(II) phosphate = 5508.646 g

Given

9.06 x 10²⁴ of Nickel(II) phosphate

Required

The mass

Solution

1 mol = 6.02 x 10²³ particles(molecules,ions, atoms)⇒Avogadro's number

So mol Nickel(II) phosphate :

n = N : No

n = 9.06 x 10²⁴ : 6.02 x 10²³

n = 15.05

mass of Nickel(II) phosphate(Ni₃(PO₄)₂ , MW=366.023 g/mol) :

mass = mol x MW

mass = 15.05 x 366.023

mass = 5508.646 g

Answer:

0.96 mol AG

Explanation:

To see the number of atoms of an element, we need to multiply stoichiometry of that molecule to the number that is written on the foot of element. Thus the balanced reaction is

[tex]\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+2Ag[/tex]

And the mole of silver produced from  0.480 mol is  0.96 mol    

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.

The unbalanced equation is

[tex]\rm Mg+AgNO_{3}\rightarrow Mg(NO_{3})_{2}+Ag[/tex]

Magnesium atoms on reactant and product side is 1.

Nitrogen atoms on reactant side is 1 and on product side it is 2 so, multiply [tex]AgNO_{3}[/tex] by 2, now the reaction becomes

[tex]\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+Ag[/tex]

Silver atom on reactant side is 2 while on product side it is 1 so, multiply Ag by 2, now the balanced equation is

[tex]\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+2Ag[/tex]

The mole ratio of Mg to silver is 1:2

1mole of Mg produce=2 mole of Silver

0.480 mol of magnesium produce= 2×0.480=0.96 mol fo silver

Thus the balanced reaction is

[tex]\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+2Ag[/tex]

And the mole of silver produced from  0.480 mol is  0.96 mol        

Learn more about the balanced equation, here:

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Answer:

protons, neutrons, and electrons

Explanation:

protons have a positive charge, neutrons have a neutrel charge, and electrons have a negative charge

Answer:

35 minutes

Explanation:

The flow rate of the stream is the rate of volume of water with respect to time. It expresses the volume of water flowing per unit time.

Flow rate = [tex]\frac{volume}{time}[/tex]

From the given question,

average flow rate of the stream = 420 cubic meters per minute, and the required volume = 14700 cubic meters.

So that;

time = [tex]\frac{volume}{flow rate}[/tex]

       = [tex]\frac{14700}{420}[/tex]

       = 35

time = 35 minutes

Therefore, with the given average flow rate, the steam will produce 14,700 cubic meters of water in 35 minutes.

Answer:

21 mol of O₂ will react

Explanation:

Based on the combustion of ethanol:

C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(g)

1 mole of ethanol, C₂H₅OH reacts with 3 moles of O₂

With this ratio of 1 mol C₂H₅OH / 3 moles O₂ we can solve the moles of O₂ that react with 7mol of ethanol:

7 mol C₂H₅OH * (3mol O₂ / 1 mol C₂H₅OH) =

Answer:

____________________________________________________________________________

Answer:

covalent

Explanation:

Answer:

a. forces acting on the object

Answer:

s was oxidized in the reaction

Answer:

Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. The surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.

Explanation:

go.ogle :)

Answer:

6th period

Explanation:

Answer:

1,15mL = V₂

Explanation:

Based on Charle's law the volume is directely proportional to the absolute temperature in a gas under constant pressure. The equation is:

V₁T₂ = V₂T₁

Where V is volume and T absolute temperature of a gas where 1 is initial state and 2, final state.

The V₁ is 1.23mL

T₁ = 32°C + 273.15 = 305.15K

T₂ = T₁ - 20°C = 285.15K

Replacing:

1.23mL*285.15K = V₂*305.15K

Answer:

nooo all cells are not same

Explanation:

like heart cell, muscles cell

100% no.

Blood cells and white cells, for example, have different colors.

White cells are larger with not much of them while blood cells are opposite.

They are in our body

Answer:

a.)Semiconductors are more conductive than a nonmetal and less conductive than a metal.

Explanation:

Answer: A is your answer

Explanation: yor welcome =]=]=]=]

Answer:

Molecular Formulas for Compounds

Explanation:

Answer:

StartFraction 37 over 2 EndFraction divided by StartFraction 17 over 4 EndFraction

Explanation:

This problem deals with solving and find the rate at which water flowed out of the tank.

Quantity of water that flowed out of the tank = 18[tex]\frac{1}{2}[/tex] gallons   = [tex]\frac{37}{2}[/tex]gallons

Time taken  = 4[tex]\frac{1}{4}[/tex]hr  = [tex]\frac{17}{4}[/tex]hr

Now to find the rate;

  Rate of water flow = [tex]\frac{Quantity of water }{Time taken}[/tex]  

 Rate of water flow  = [tex]\frac{37}{2}[/tex] / [tex]\frac{17}{4}[/tex]  

                                 =  [tex]\frac{37}{2}[/tex] x [tex]\frac{4}{17}[/tex]

                                 = [tex]\frac{74}{17}[/tex]gallons/hr

Answer:

D

37/2 divided by 17/4

Explanation:

edge 2020

Answer:

the force needed to produce the same acceleration is 480kg

Answer:

NH₃ is limiting reactant .

Explanation:

Given data:

Number of moles of NH₃ = 45 mol

Number of moles of NO₂ = 50 mol

Limiting reactant  = ?

Solution:

Chemical equation:

8NH₃ + 6NO₂        →      7N₂  + 12H₂O

Now we will compare the mole of reactants with products.

               NH₃           ;          N₂

                 8              :          7

               45              :        7/8×45 = 39.4 mol

                NH₃           ;         H₂O

                 8              :          12

               45              :        12/8×45 = 67.5 mol

               NO₂           ;          N₂

                 6              :          7

               50              :        7/6×50 = 58.3 mol

               NO₂           ;         H₂O

                 6              :          12

               50              :        12/6×50 = 100 mol

Less number of moles of product are formed by the ammonia thus it will be limiting reactant.

Answer:

C

Explanation:

USA Test prep

The aluminum metal has atoms with greater attraction than the atoms in nitrogen gas. Hence option C is correct.

Metals are defined as a substance that appears shiny when freshly manufactured, polished, or broken, and conducts electricity and heat rather well. A metal element is an element with metallic bonding and positive ions. The periodic table contains mostly metals. The earth's crust is where most pure metals are found. The majority of the planet's iron mass, which makes up over a third of its mass, is located in its core.

Under a specific set of circumstances, a substance's state of matter is controlled by its molecular qualities rather than the other way around. While relatively weak intermolecular interactions promote the gaseous state, strong intermolecular forces favor a condensed form of matter (liquid or solid).

Thus, the aluminum metal has atoms with greater attraction than the atoms in nitrogen gas. Hence option C is correct.

To learn more about metals, refer to the link below:

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Answer:

The kinetic energy of an object is also measured in joules. Anything that is moving has kinetic energy, but various factors affect how much kinetic energy an object has. The first factor is speed. If two identical objects are moving at different speeds, the faster object has more kinetic energy.  In physics, the kinetic energy  of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

Explanation:

Answer: Potential energy is a little different. It is the energy an object has the potential to create. The energy produced is determined similarly to kinetic. It depends on the object's mass, the gravitational pull when up or down slopes, and the height of the reference point.

another explanation:

a) Potential Energy:

mass and height

We know that potential energy, PE is equal to the product of the mass, the gravitational acceleration and the height.

Since gravity is constant, the mass and height are the factors.

b) Kinetic Energy:

The mass (m) of the object and the speed (v) of the object.

Because kinetic energy is proportional to the velocity squared, increases in velocity will have an exponentially greater effect on transitional kinetic energy. Doubling the mass of an object will only double its kinetic energy, but doubling the velocity of the object will quadruple its velocity.

Answer:

A

Explanation: