CHEMISTRY HIGH SCHOOL

What are the horizontal rows on the periodic table?

Answers

Answer 1
Answer:

Answer:

Periods the horizontal rows on the periodic table.

Explanation:

In a modern periodic table elements are arranged increasing number of their atomic numbers.

The horizontal rows known as periods , there are 7 seven periods

In his periodic table, elements lying in the same period have same number of shells around the nucleus.

The vertical columns known as groups, there total 18 groups.

In his periodic table, elements having similar properties lied in the same vertical columns or groups because all the elements had same number of valence electrons.
Answer 2
Answer: They are called periods

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Which reaction occurs most rapidly at standard conditions?H2(g) + I2(s) 2HI(g) Cu(s) + S(s) CuS(s) C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g) 5C2O42-(aq) + 2MnO4-(aq) + 16H+(aq) 10CO2(g) + 2Mn2+(aq) + 2H2O(l) Ag+(aq) + I-(aq) AgI2(s) NextReset
Find the final equilibrium temperature when 15.0 g of milk at 13.0 degrees c is added to 148 g of coffee with a temperature of 88.3 degreesc. assume the specific heats of coffee and milk are the same as for water (c = 4.19 j/g•c), and disregard the heat capacity of the container.

Calculate the number of moles
230 g of C2H5OH 
560 g of C2H4 
0.640 g of SO2

Answers

mass of C = 12g
mass of H = 1g
mass of O = 16g
mass of C2H5OH = 46g = 1 mole

1 mole of C2H5OH ------------ 46g
x moles of C2H5OH ----------- 230g
x = 5 moles of C2H5OH

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mass of C = 12g
mass of H = 1g
mass of C2H4 = 28g = 1 mole

1 mole of C2H4 -------------- 28g
x moles of C2H4 ------------- 560g
x = 20 moles of C2H4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mass of S = 32g
mass of O = 16g
mass of SO2 = 64g = 1 mole

1 mole of SO2--------------------- 64g
x mole of SO2 -------------------- 0,64g
x = 0,01 moles of SO2

Which of the following describes the Bohr atomic model?A. Protons, neutrons, and electrons orbit around each other in set paths.
B. The nucleus contains protons and neutrons and is orbited by electrons.
C. Protons, neutrons, and electrons occupy the same spaces within the atom.
D. Protons occupy the center of an atom, with neutrons and electrons circling.

Answers

Answer: option B. The nucleus contains protons and neutrons and is orbited by electrons.

This is the planetary model, which is so known nowadays, but it is not correct. The quantum model is based in orbitals (not orbits), which are regions around the nucleus where are the electrons, but they are not circling around the nucleus. 

Juan created a chart to help him study for a test.A 2-column table. The first column labeled X has entries some light is reflected, some light is absorbed, no light passes through. The second column labeled Y has entries some light is reflected, some light is absorbed, some light is reflected, most light passes through.

Which headings best complete the chart?

X: Transparent Objects
Y: Opaque Objects
X: Opaque Objects
Y: Transparent Objects
X: High Frequency Waves
Y: Low Frequency Waves
X: Low Frequency Waves
Y: High Frequency Waves

Answers

The light in the electromagnetic spectrum which passes in first case is through opaques objects while in second case it is transparent objects.

What is an electromagnetic spectrum?

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

Learn more about electromagnetic spectrum,here:

brainly.com/question/23727978

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Answer:

B) X: Opaque Objects

Y: Transparent Objects

Explanation:

Just had this question and got it right

What would happen if Earth absorbed all of the heat from the sun?(1 point)

Answers

The Earth would then intern become way too hot.

At the moment the sun provides just the right amount of heat to sustain all life on Earth, if the Earth absorbed all of the heat from the sun, the temperature would increase dramatically, leading to extreme heat. That would also lead to pretty much everything on the planet to die.

Hope this helps! :)
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The first table was arranged by atomic mass, but later Mosely improved it by arranging by _______________.

Answers

Order of increasing atomic mass!

hope this helps :)
The first table, created by Mendeleev, was arranged by increasing atomic mass. However, it was later changed by Mosley, who arranged it the way it is today. He organized it by atomic number.

A student wants to make an electromagnet. Which items are needed?magnet copper wire
copper wire, metal nail, battery
magnet, copper wire, metal nail
battery, heat source, copper wire

Answers

Answer:

copper wire, metal nail, battery

Explanation:

To create an electromagnet, the material to be magnetized (such as a metal nail) is placed inside a solenoid, the ends of the coils are connected to a circuit that includes a battery.

Current is allowed to flow for a few seconds and then cut off. The polarity of the magnet depends on the direction of flow of current in the solenoid.
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