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Answer:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Explanation:

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Answer:

It is soft and white. It has a low melting and boiling point, a good conductor electricity, and reacts with water. Furthermore, it is also highly reactive, malleable, and ductile.

Explanation:

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Answer:

silvery-white and waxy

Explanation:

Properties means the observations you can make just by looking at it or the qualities that the object has.

So when I looked at the sodium I saw a silvery-white metal (sodium is a metal), that has this waxy appearance to it.

Answer:

c

Explanation:

Answer:

2 hydrogen and 1 oxygen

Explanation:

H2O

Hydrogen has the coefficient so you multiply 1 by 2 and it equals 2

Oxygen does not have any sub or coe so its automatically 1

Answer:

The oxidation number of Oxygen is -2.

Answer:

-2

Explanation:

I just had that question!

Answer:

C

Explanation:

5 moles of oxygen are needed to produce 1 mols of P4O10

x moles of oxygen are needed to produce 2 mols of P4O10

5/x = 1/2             Cross multiply

1*x = 2 * 5           Combine

x = 10

C

Answer:Conduction: Touching a stove and being burned. Ice cooling down your hand

Convection: Hot air rising, cooling, and falling (convection currents)

Radiation: Heat from the sun warming your face

Explanation:

Answer:

Radiation: Radio Waves, Conduction: An ice cube on a warm hand, Convection: A radiator

Answer:

The atomic number of silicon 14

According to periodic table

The atomic number of silicon is 14

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Answer:

The new volume of the air inside when the cabin is pressurized to 75 kPa is 37818.[tex]\overline 6[/tex] m³

Explanation:

The given 747 airplane parameters are;

The volume of air in the airplane, V₁ = 28,000 m³

The pressure of the air on the ground, P₁ = 101.3 kPa

The pressure of the air once it is in flight, P₂ = 75 kPa

Let V₂ represent the new volume of the air inside when the cabin is pressurized to 75 kPa

Boyle's Law states that the pressure of a given mass of air is inversely proportional to its volume at constant temperature

Therefore, by Boyle's law, we have;

P ∝ 1/V and P₁·V₁ = P₂·V₂

Which gives;

V₂ = P₁·V₁/P₂

Substituting the known values, we get;

V₂ = 101.3 kPa × 28,000 m³/(75 kPa) = 37818.[tex]\overline 6[/tex] m³

The new volume of the air inside when the cabin is pressurized to 75 kPa = V₂ = 37818.[tex]\overline 6[/tex] m³.

The given orbital diagram are iron and symbol for the element is Fe

Orbital diagrams are a pictorial description of electrons in an atom and where electron go in atom then we have to follow three rules, and the first one being the Auf bau Principle, the Auf bau Principle states that each electron occupies the lowest energy orbital  first filled and the second is pauli exclusion principle in which only two electron are present which is in opposite spin and third is hunds rule of maximum multiplicity in which pairing of electron is not possible until orbital are singly occupied this rules are used for filling the electron here given orbital diagram in which 1s²2s²2p⁶3s²3p⁶4s²3d⁶ means the element is iron and symbol of this element is Fe

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Answer:

B. Add more water to decrease the concentration.

Explanation:

If we add more water to the solution, the concentration is decreased and like wise the conductivity of the solution.

Concentration and conductivity are directly proportional to one another. The higher the concentration, the higher the conductivity and vice versa.

Answer:

45.9m

Explanation:

Given parameters:

Mass of the ball  = 1kg

Initial velocity  = 30m/s

Unknown:

Height the ball will travel  = ?

Solution:

At the maximum height, the final velocity of the ball  will be 0;

  Using ;

   V²   = U²   - 2gh

V is the final velocity

U is the initial velocity

g is the acceleration due to gravity

h is the height

     0² = 30²   - (2 x 9.8 x h)

    0 = 900 - 19.6h

      h  = 45.9m

Answer:

Lithium

Explanation:

Answer:

0.355L

Explanation:

1fl oz (Fluid ounce) is an unit of volume widely used in United States of America. 1fl oz is equivalent to 29.5735mL.

12.0 fl oz are:

12.0fl oz * (29.5735mL / 1fl oz) = 354.9mL

There are 354.9mL in 12.0 fl oz.

As 1L = 1000mL, in 354.9mL you have:

354.9mL * (1L / 1000mL =

Answer:

A

Explanation:

B. That's a solid

C. Liquid is the only thing that can have viscosity

D. Not necessarily the case

Answer:

It should be 1. 1.2 X 10^24

Explanation:

Answer:

3

Explanation:

It is based on empirical evidence

The characteristic of science is that it is based on empirical evidences comprising of a hypothesis.

Hypothesis can be defined as an assumption which is made for the sake of argument . It is an interpretation of a practical condition for which action needs to be taken.It is defined as a tentative assumption which is made to test logical consequences.It is an antecedent clause of a statement which is conditional.

It is constructed before research. There are six types of hypothesis 1)simple hypothesis 2) complex hypothesis 3) directional hypothesis 4)non-directional hypothesis 5) null hypothesis 6)casual hypothesis

The hypothesis should be clear and precise, it must be specific and way of explanation of hypothesis should be simple.

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Answer:

B. Mass in motion. Is the definition of momentum

Answer:

Electrical energy (form of kinetic energy)

Explanation:

Answer:

Cu   +   2AgNO₃    →   2Ag   +  Cu(NO₃)₂

Explanation:

We are to give the reaction expression for this displacement reaction.

 Reactants  = copper and silver nitrate solution

 Products  = silver and copper (II) nitrate

Copper  = Cu

 Silver nitrate solution  = AgNO₃  

Silver  = Ag

copper (II) nitrate  = Cu(NO₃) ₂

So:

         Cu   +   2AgNO₃    →   2Ag   +  Cu(NO₃)₂

Answer:

As temperature increases, a substance will change from solid, to liquid, to gas. ... Apply Butter is made by intentionally changing the density of liquid milk.

Explanation:

Answer:

If an object is at rest, then there are no forces acting on the object. It would take an unbalanced force to keep an object in motion at a constant velocity. It is the natural tendency of all objects to eventually come to a rest position.

Explanation:

Answer:

55 protons, 78 neutrons, 55 electrons

Explanation:

In a neutral Cesium atom we have 55 protons, 78 neutrons and 55 electrons. This can be found on the periodic table of elements.

Protons are the positively charged particles within an atom

Neutrons do not carry any charges.

Electrons are the negatively charged particles.

The amount of these subatomic particles can be obtained from the periodic table of element.

For a neutral atom, the number of protons and electrons are the same.

Since the atomic number is 55, it is also the number of protons in the atom.

Answer:

Explanation:

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Answer:

12.67g of Mg / 15.33g of MgO * 100% = 82.6% of Mg

Explanation:

Answer:

5.6[tex]\frac{6.02*10^{23} }{1}[/tex] = 3.4 X [tex]10^{24}[/tex]

Explanation:

the correct answer to it is 3.4 instead of 3.2. I got 3.4 from rounding it from 3.37.

The number of atoms in 5.6 moles of Na have been [tex]\rm \bold{3.37\;\times\;10^2^4}[/tex] atoms.

Atoms have been defined as the smallest unit of matter. The number of atoms in a mole of compound has been given by Avogadro law.

According to the Avogadro law, the number of atoms in mole of sample has been equal to the Avogadro number. The values of Avogadro number has been [tex]6.023\;\times\;10^2^3[/tex].

The available moles of Na have been 5.6 moles.

The number of atoms has been given by:

[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;atoms\\ 5.6\;mol=5.6\;\times\;6.023\;\times\;10^2^3\;atoms\\ 5.6\;mol=3.37\;\times\;10^2^4\;atoms[/tex]

The number of atoms in 5.6 moles of Na have been [tex]\rm \bold{3.37\;\times\;10^2^4}[/tex] atoms.

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