How did later chemists change Mendeleev’s periodic table?

A. They included physical properties such as melting point and density.

B. They used atomic number instead of atomic mass to organize the elements.

C. They used atomic mass instead of atomic number to organize the elements.

D. They included chemical properties such as bonding power.​

Answer: Projectiles travel with a parabolic trajectory due to the influence of gravity. There are no horizontal forces acting upon projectiles and thus no horizontal acceleration, The horizontal velocity of a projectile is constant (a never changing in value.

Explanation: I hoped that helped yall !!

c) so they could benefit from using the most accurate measurement system

Explanation:

yuh

Its becuase weight and mass are different. Even if an object weighs more than another object it might not have more mass than the other object.

Answer:

Answer is A

Explanation:

GOT IT RIGHT ON A P E X :)

The reason for the apparent motions of the sun and other stars across the night sky is the rotation of earth. Hence, option (A) is correct.

The rotation of the planet Earth around its own axis and variations in the orientation of the rotation axis in space are referred to as Earth's rotation or Earth's spin. Earth rotates prograde in an easterly direction. Earth rotates against the direction of the northern polar star Polaris.

The Northern Hemisphere's North Pole, sometimes referred to as the Geographic North Pole or Terrestrial North Pole, is where the Earth's axis of rotation and surface meet. The North Magnetic Pole of the Earth is distinct from this place. The other location where the axis of rotation of Earth crosses the surface is the South Pole, which is located in Antarctica.

The reason for the apparent motions of the sun and other stars across the night sky is the rotation of earth. Hence, option (A) is correct.

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Answer:

Wheres. The. Pics. Of. The. Structures

Explanation:

Answer:

I think the answer is A but I could be wrong but I think the answer is A. please let me know if I am wrong.

Answer:

c. Joints allow the roadway to expand and contract as cars put force on the bridge

Explanation:

Joints in the roadways of bridges allows for the roadway to expand and contract as cars put force on the bridge.

The force on the bridge and the ambient temperature causes expansion of the materials used in making the bridge.

Answer:

Explanation:

I think its

c.d and a.a

im so sorry if i get it wrong

Answer:

the sum of an object kinetic and potential energy

Answer:

In air the particles are much faster than in the ice water

Explanation:

In ice water it's logically much colder, aso ice is solid, which means the particles can't move freely, otherwise it wouldn't be solid. In the air they can move around freely, because air isn't solid, it's gaseous.

Answer:

more massive objects fall faster than less massive objects because they are acted upon by a larger force of gravity

Explanation:

Anwser

For general projectile motion with no air resistance, the horizontal component of a projectile's velocity ... D. first decreases and then increases ... E. The speed of the object is constant but its velocity is not constant. C ... Neglecting air resistance, when the package hits the ground

Explanation:

Explanation:

well its depends for example one car might be going down the hilll and the other up a hill and there the velocity can change between the cars because of gravity so one can be going faster and the other slower.

Answer:

When work is being done, the practie of labor is being performed. When work isn't being completed, this is a sign of procrastination.

Explanation:

In the answer.

Answer:

D- energy is being transferred

Explanation:

Answer:

0.0136

Explanation:

For the series connection

Effective resistance= 6 + 12= 18 ohm

Current= 6/18=0.33 A

Heat= I^2R= 0.33^2 × 18= 1.96 J

For parrallel

Effective resistance= 6^- 1+12^-1 = 0.167 + 0.083= 0.25 ohm

Current= 6/0.25= 24 A

Heat= 24^2 × 0.25=144J

Ratio of series to parallel= 1.96/144=0.0136

Answer:

C

Explanation:

you cannot any other thing if you don't even know what you are designing.

The first step in the technological design process is to define a need or problem, therefore the correct answer is option C.

There are mainly five stages of technological design,

Identifying the issue that needs to be solved is the first step in every problem-solving process.

The second stage is to imagine; during this phase,

The chosen product from the imaging stage is planned in the third stage.

Testing, evaluating, and modifying the product are the fourth stage.

The sharing of your solution is the fifth step. To gather comments, discuss your ideas with others, and enhance your product,

Technological designing is a lengthy process that involves a number of steps but identifying the problem we are going to is the most important step among all of the steps because a wrong approach to the problem would lead to faulty design in the later stages.

Thus, the first step in the technological design process is to define a need or problem, therefore the correct answer is option C.

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Initial velocity (u) = 10.8 m/s

Final velocity (v) = 3.7 m/s

Acceleration (a) = -2.67 m/s²

By using equation of motion, we get:

[tex] \bf \longrightarrow v = u + at \\ \\ \rm \longrightarrow 3.7 = 10.8 + ( - 2.67)t \\ \\ \rm \longrightarrow 10.8 - 2.67t = 3.7 \\ \\ \rm \longrightarrow (10.8 - 10.8) - 2.67t = 3.7 - 10.8 \\ \\ \rm \longrightarrow - 2.67t = - 7.1 \\ \\ \rm \longrightarrow \dfrac{ - 2.67}{ - 2.67} t = \dfrac{ - 7.1}{ - 2.67} \\ \\ \rm \longrightarrow t = 2.6 \: s[/tex]

[tex] \therefore [/tex] Time taken (t) = 2.6 s

Answer:

Mass, m = 27g

Explanation:

Given the following data;

Initial Temperature, T1 = 25°C

Final temperature, T2 = 50°C

Quantity of heat = 2825J

Specific heat capacity of water = 4.184

Heat capacity is given by the formula;

[tex] Q = mcdt[/tex]

Where,

Making mass, m the subject of formula, we have;

[tex] m = \frac {Q}{cdt} [/tex]

Change in temperature, dt = T2 - T1

Change in temperature, dt = 50-25 = 25°C

Substituting into the equation, we have;

[tex] m = \frac {2825}{4.184 * 25} [/tex]

[tex] m = \frac {2825}{104.6} [/tex]

Mass, m = 27g

Therefore, the mass of water that can be added is 27 grams.

Answer:

a wave in which the direction of displacement is the same as the direction of propagation, as a sound wave.

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Longitudinal waves are those in which the particles of a medium vibrate to and fro in the direction of propagation of the wave through the medium. Sound wave is an example of longitudinal wave.

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Answer:

B Raise the object farther off the ground

Answer:

B1 and A2

Explanation:

the first one would be B because put 4 into mass times it by the velocity divide it by half because of the radius so the ending result would be 4

number 2 would be  A because just input the numbers by the mass, velocity etc.) then any number  that needs to be divided for an example radius would have to divide so you divide to get the answer.

Hello there,

Answer: The answer to you're question is B.) carrying nutrients to and within cells.

Explanation: Water's extensive capability to dissolve a variety of molecules has earned it the designation of “universal solvent,” and it is this ability that makes water such an invaluable of life sustaining force. On a biological level, water's role as a solvent helps cells transport and use substances like oxygen or nutrients. Catch this, water helps take the toxins out of your body. Water also helps you from getting sick. Plus, the brain is 90% water. So, drink that water..... :3

Answer:

Kinetic energy increases and potential energy decreases when the velocity of an object increases

Answer:

15.3N/s

Explanation:

Given parameters:

Mass of ball  = 0.3kg

Force  = 900N

Contact time  = 0.017s

Unknown:

The impulse on the ball  = ?

Solution:

Impulse is the product of force and time of action of the force;

     Impulse  = force x time

Now insert the parameters and solve;

    Impulse  = 900 x 0.017  = 15.3N/s

Answer:

unmmmmmmmm I think the answerA

Answer:

2mg+o2--->2mgo

2moles of mg react with one mole of o2 to form 2 moles of mgo

given 2.5moles of o2 hence 5moles of mg will react

Answer:

fire

Explanation:

The combustion of propane (C3H8) formed the products of carbon dioxide and water.

Alkanes are known as saturated straight-chain aliphatic hydrocarbons. They undergo combustion reactions with oxygen. Like other alkanes, Propane exhibits combustion reaction in the same way as other alkanes do.

During combustion reaction, Propane burns in the presence of abundant oxygen to produce water and carbon dioxide. This combustion reaction librates a heat of about 50 MJ/kg.

The equation of the reaction can be shown as:

[tex]\mathbf{C_3H_8 + 5O_2 \to 3CO_2 + 4H_2O}[/tex]

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