CHEMISTRY HIGH SCHOOL

Which of the following shows a periodic pattern?A.there are two ducks in one pond.

B.there is meat next to the cheese in the refrigerator

C.a boy waits five minutes to talk to his father

D.the mother takes her medication everyday at seven

Answers

Answer 1
Answer: Out of the following choices, the one that shows a periodic pattern is "the mother takes her medication everyday at 7." 

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A chemical reaction in which compounds break up into simpler constituents is a _______ reaction. A. double replacementB. substitutionC. decompositionD. combination

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Answers

It is an empirical formula 

The height of a building is 31.0 meters.how tall is the building in kilometers?

Answers

The metric system is used for the measurement of the fundamental parameters. The building is 0.031 kilometers tall when it has a height of 31.0 meters.

What are units of height?

Height has been the measure of the distance that is vertical and depicts the tallness of the object. The height of the object can be measured in feet, inches, meters, centimeters, kilometers, etc.

The conversion factor for the height from meters to kilometers is given as,

1 meter = 0.001 kilometers

Given,

Height of building = 31.0 meters

Substituting values in the conversion data the height of the building in kilometers is calculated as

1 meter = 0.001 kilometers

31.0 meters =? km

Solving further,

(31.0 meters × 0.001 kilometers) ÷ 1 meter

= 0.0310 kilometers

Therefore, the building is 0.0310 kilometers tall.

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To find the answer, you would use Dimensional Analysis, as follows:

31 meters * (1 kilometer)/(1000 meters) = 0.031 kilometers

Is sodium element a metal nonmetal or metalloid

Answers

Sodium Na is a soft, low-density member of the alkali metal family. The element sodium is a very delicate silvery-white.

Sodium makes up 2.8 percent of the Earth's crust and is the most prevalent alkali metal and sixth most plentiful element on the planet.

A metal is a substance that has a shiny look when freshly processed, polished, or shattered, and conducts electricity and heat rather effectively. Typically, metals are malleable and ductile.

Ionic linkages mix metals with non-metals, whereas metallic connections happen between metal atoms. The metallic bonding joins metal atoms.

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Sodium Na is a metal that belong to the alkali metal with low density and soft 

Hydrogen has three isotopes 1H, 2H, and 3H. What is the difference between these three isotopes?

Answers

The main difference between the 3 isotopes of hydrogen are the number of neutrons in the nucleus. Hydrogen has no neutrons, Deuterium has one neutron, and tritium has two neutrons. All three have one proton and one electron.

The making of ice cubes is an endothermic reaction

Answers

Answer:

no

Explanation:

it is not endothermic reaction

What is true about an ocean current that is moving toward the equatorA. Warm
B. Fast
C. Cold
D. Slow

Answers

Ocean current that is moving toward the equator is cold. The windblown surface currents distribute heat all over the globe through moving the water which is warm away from the equator and the cool water will replace which is from the north and south poles. An example of this is the Gulf Stream which moves warm water towards the Great Britain and Europe.
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