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oksano4ka [1.4K]
3 years ago
7

An atom from the column 1 can form an iconic compound with another from column 18

Chemistry
1 answer:
Lyrx [107]3 years ago
7 0
The Answer is False





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What is a problem that would likely occur if two cultures had different calenderars
aksik [14]
The Sun, Moon, and stars have helped people for thousands of years. When you look into the sky, you will notice that they follow certain patterns. This happens most of the time, but not all of the time. Since most patterns repeat over and over, they have helped us keep track of time. These patterns have also helped us make calendars. Making calendars was a difficult task. Our ancestors had to decide on the length of a year. Also, they had to decide on the length of a day. As you know a day takes 24 hours. That is the time that Earth takes to rotate once on its axis. A year is longer and takes 365 days. This length of time is related to the time that it takes for Earth to go around the Sun. However, this is not exactly true. Earth’s trip takes 365 days – plus a fraction of another day. This is what complicates our calendar. We have been able to solve this problem by adding an extra day in the month of February. Most often, you will see that February has 28 days. Every four years, February has one extra day. During this year we end up with 29 days in this month. When this happens, the year is called a Leap Year. It helps us keep our calendar in order. Deciding on the length of a month has also been a challenge. Some cultures around the world have used a lunar calendar. A lunar calendar is based on the Moon’s cycle. The Moon takes 29 and one-half days to complete one cycle. Then things got a lot harder. Different cultures start their months at a different time of the Moon’s cycle. For example, the Hebrew and Islamic calendars start their months when a crescent moon is seen in the sky. The Chinese start their new months at the new moon phase. These differences have made it harder for cultures to communicate. Trading with one another has also been hard for this reason. As time went by, most countries began to use the same calendar. When this happened in the twentieth century, trade and communication became a lot easier. Some countries decided to drop thirteen days from their calendar. This is because their old way of counting did not match up with the new way. England had problems with the calendar back in the 1500s. The English decided to divide their calendar into months. Each month had four weeks. By doing this, one week ended up being longer than seven days. Also, this resulted in thirteen months to a yea
3 0
3 years ago
Read 2 more answers
How many valence electrons would an element with atomic number 113 have?
marshall27 [118]

How does the law of conservation of mass apply  to this reaction: C2H4 + O2 → H2O + CO2?

4 0
3 years ago
Add the polynomials (7x^3-2x^2-12)+(3x^3-8x^2+10x)
laiz [17]

Answer:

10 x ^3 − 10 x ^2 + 10 x − 12

Explanation:

4 0
3 years ago
If 2 CH3OH + 3 O2 -> 2CO2 + 4 H2O was carried out in the laboratory and 219 g of water was produced, what would the percent y
ANEK [815]

Answer:

Percent yield = 84.5 %

Explanation:

Given data:

Mass of methanol = 229 g

Actual yield of water = 219 g

Percent yield of water = ?

Solution:

Chemical equation:

2CH₃OH + 3O₂  →  2CO₂  + 4H₂O

Number of moles of methanol:

Number of moles = mass/ molar mass

Number of moles = 229 g/ 32 g/mol

Number of moles = 7.2 mol

Now we will compare the moles of water with methanol.

                        CH₃OH         :            H₂O

                            2               :               4

                           7.2             :           4/2×7.2 = 14.4 mol

Mass of water:

Mass = number of moles × molae mass

Mass = 14.4 mol × 18 g/mol

Mass = 259.2 g

Percent yield:

Percent yield = actual yield / theoretical yield × 100

Percent yield = 219 g / 259.2 g × 100

Percent yield = 84.5 %

7 0
3 years ago
As you go down group one of the periodic table, the reactions become and more
Lady bird [3.3K]

Answer:

vigorous

Explanation:

As you go down group one of the periodic table, the reactions become and more vigorous.

3 0
2 years ago
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