CHEMISTRY HIGH SCHOOL

Earth is divided into 24? A) equators
B) coordinates
C) degrees
D) time zones

Answers

Answer 1

Answer:

Answer is: D) time zones.

Earth is divided into 24 timezones.

Most timezones are exactly one hour apart.

Timezone is a region on Earth bounded by lines of longitude.

Coordinated Universal Time (UTC) is the basis for modern civil time.

For example, UTC±00:00 is the Western European Time (Ireland, Portugal and UK).

UTC+01:00 is Central European Time, West Africa Time.

Answer 2

Answer:

The earth is divided in 24 time zones. The correct option is D.

What is the earth divided into?

The earth is divided into 24 time zones. Each time zone represents a region where the same standard time is used. These time zones are approximately 15 degrees of longitude wide and are centered on the Prime Meridian (0 degrees longitude).

As the Earth rotates 360 degrees in 24 hours, each time zone covers roughly 1 hour of time difference from its neighboring zones. Time zones are crucial for coordinating activities and scheduling across different regions, ensuring global synchronization and smooth functioning in a world that spans multiple longitudes.

Read more about earth here: brainly.com/question/25624188

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Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds. sulfate = SO4 -2 phosphate = PO4 -3 hydroxide = OH- sodium sulfateNaSo4
Na2SO4
Na(SO4)2
NaSO8

Answers

Answer:

The correct answer is $Na_2SO_4$ .

Explanation:

Given polyatomic ions:

1) Sulfate = $SO_(4)^(2-)$

2) Phosphate = $PO_(4)^(-3)$

3) Hydroxide = $OH^-$

The formula of Sodium sulfate will be:

$2Na^++ SO_(4)^(2-)\rightarrow Na_2SO_4$

Sodium carries 1+ charge and and sulfate ion carries 2-charge. In order to neutralize negative charge on sulfate ion two sodium ions will be needed.

Since the sodium ion is Na+, and sulfate is SO4(2-), you'll need 2 sodiums for a sulfate, making sodium sulfate Na2SO4.

Determine the pH of a 5x10^-4 M solution of Ca(OH)2

Answers

Ca(OH)₂ ==> Ca²⁺ + 2 OH-

Ca(OH)₂ is strong Bases

Therefore, the [OH-] equals 5 x 10⁻⁴ M. For every Ca(OH)₂ you produce 2 OH⁻.

pOH = - log[ OH⁻]

pOH = - log [ 5 x 10⁻⁴ ]

pOH = 3.30

pH + pOH = 14

pH + 3.30 = 14

pH = 14 - 3.30

pH = 10.7

hope this helps!

How many grams of water are produced when 2.50 mol oxygen reacts with hydrogen?

Answers

Given:

2.5 mol O2

Required:

Grams of water

Solution:

2H2 + O2 -> 2H2O

Moles of H2O = (2.5 mol O2)(2moles H2O/1 mole O2) = 5 moles H2O

Molar mass of H2O = 18.02 g/mol

Mass of H2O = (5 moles H2O)( 18.02g/mol)

Mass of H2O =90.1g H2O

The falling of rain, snow, hail, or ice pellets from the atmosphere is called watering

precipitation

perception

Answers

Precipitation is when water falls from the clouds in one form or another.
Watering isn't the right term.
Perception is seeing something.

Answer:

Precipitation

Explanation:

Determine the mass 2 mol Li??

Answers

You can look on the periodic table for the number of automic mass units in each element.

1 mole Li = 6.94 amu
6.94 • 2 = 13.9 amu

There are 13.9 amu in 2 moles of Li

Molar mass Li = 6.94 g/mol

1 mol --------- 6.94 g
2 mol --------- ?

Mass Li = 2 * 6.94 / 1

Mass Li = 13.88 g

hope this helps!

Cigarettes contain many chemicals. Which of the following chemicals is the addictive component to cigarettes?a. tar
b. nicotine
c. carbon dioxide
d. carbon monoxide