Chemistry, 04.02.2020 23:59 engbarthcobie

#1: how are the elements arranged in the modern periodic table?

a. by increasing atomic mass
b. by decreasing atomic mass
c. by increasing atomic number
d. by decreasing atomic number

#2: which of these sets of elements has similar properties?

a. hydrogen, helium, neon
b. oxygen, nitrogen, carbon
c. strontium, magnesium, calcium, beryllium
d. chromium, magnesium, iron, cobalt

#3: which element has properties most similar to sodium?
a. potassium
b. calcium
c. aluminum
d. neon

#4: why didn't mendeleev include helium, neon, and argon in his periodic table?
a. these elements did not fit in with his pattern.
b. these elements are gases and he didn't include gases.
c. the atoms of these elements had no atomic mass.
d. these elements had not yet been discovered.

#5: the periodic law describes trends seen across which of the following?
a. the top half of periodic table
b. periods within the periodic table
c. radioactivity within the periodic table
d. elements with the same number of protons

Answers: 1

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Answers

1. The elements are arranged in the modern periodic table by increasing atomic number. The correct option is option "C".

2. "Strontium, magnesium, calcium, beryllium" are the elements among the choices given in the question are the elements having similar properties. The correct option is option "C".

3. "Potassium" is the element among the choices given in the question that has properties most similar to sodium. The correct option is option "A".

4. Mendeleev didn't include helium, neon, and argon in his periodic table because these elements had not yet been discovered. The correct option is option "D".

5. The periodic law describes trends seen across periods within the periodic table. The correct option is option "B".

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

the answer is 303.15 or 303

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#1: how are the elements arranged in the modern periodic table?

a. by increasing atomi...

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