CHEMISTRY HIGH SCHOOL

What has the same number of valence electrons in the outermost shell?“These ____ have the same number of valence electrons in their outermost shell.”


Word bank-
Groups
Families
Periods
Electrons

Answers

Answer 1
Answer:

Answer:

Groups

Explanation:

Elements with the same number of valence electrons are found in the same column(group) of the Periodic Table.

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Which value has more significant figures? A)2.63x10^6 B)0.0000026
If a sample of gas in a rigid container has a temperature of 28.1°C at pressure of 121.2kPa.What will the pressure increase to if heated to a temperature of 89.3°C?
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What is the % yield of CO2 if 10g of CO produces 12.8 g CO2?
2CO + O2 → 2CO2

Answers

Moles CO = 10.0 g / 28.01 g/mol = 0.357 
the ratio between CO and CO2 is 2 : 2 ( or 1 : 1) so we would get 0.357 mole of CO2 ( 100% yield) 

mass CO2 = 0.357 mol x 44.0098 g/mol = 15.7 g ( theoretical yield) 

% yield = 12.8 x 100 / 15.7 = 81.5

Hope this helps.
The % yield is 81.5 :DDDDDD

What did alchemists contribute to the development of chemistry?

Answers

The alchemists were the first chemists, but they were also mixing chemicals, they believed that magic would help with their experiments.but it didn't. but their experiments of the science of chemistry did.

Final answer:

Alchemy made contributions to the development of chemistry through advancements in manipulating matter, discovering the law of conservation of matter, and contributing to the understanding of atoms and the periodic table.

Explanation:

Alchemy made some contributions to the development of chemistry. Although it was not scientific by modern standards, alchemists made progress in manipulating matter and exploring the properties of substances. One example of an alchemist's contribution is the discovery of the law of conservation of matter by Antoine Lavoisier, often regarded as the father of modern chemistry. Lavoisier's work with gases also changed chemistry from a qualitative to a quantitative science and laid the groundwork for further study. Additionally, alchemists played a role in developing the concept of atoms and the periodic table, which are fundamental in chemistry.

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Why do plants grow faster without sun?

Answers

Plants rely on photosynthesis to create energy for all of their cellular functions. The more sun the plant takes in, the more energy it is able to produce, thus allowing it to grow faster.
The plant won't be strong though it will be weak and pale trying to find that light and absorb the rays that help build it's chlorophyll to make it strong.

The SI unit for current is: joules


volts


ohms


amps

Answers

Ampere is the si unit of current

What is the carbon cycle

Answers

the series of processes by which carbon compounds are interconverted in the environment, chiefly involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
the cycle of thermonuclear reactions believed to occur in stars, in which carbon nuclei are repeatedly formed and broken down in the conversion of hydrogen into helium.

Any method of determining whether an event or object is older or younger than others

Answers

the answer is relative dating, btw

I believe its relative dating.
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