Chemistry High School

which is the country to use paper currency​

Answers

Answer 1

Answer:

the first country that uses paper currency is china

Answer 2

the first use of paper currency can be traced back to the year 806 AD in China where they were used as flying currency

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PLESE HELP WILL GIVE BRAINLYESTY
Imagine that you are Andreas Vesalius. Write a short autobiographical statement that talks about who you are, where you’re from, and some of your important contributions.

Answers

Answer:

My name is Andreas Vesalius and I'm a 16th-century Flemish anatomist, physician, and author of one of the most influential books on human anatomy, De Humani Corporis Fabrica Libri Septem. I am often referred to as the founder of modern human anatomy. I was born in Brussels, December 31, 1514 which was then part of the Habsburg Netherlands. I was a Flemish doctor who was notable for my contribution to the science of anatomy of the human body. I was the first to perform public dissection on a human corpse, a practice that was unusual in the Middle Ages due to spiritual beliefs.

Explanation:

is zinc an example of a element or compound?

Answers

Answer:

Zinc is an element.

Explanation:

Compounds are composed of two or more elements

Answer:

element

Explanation:

zinc is an element with atomic number 30

Ann is studying acid base neutralization reactions and mixes sodium hydroxide and hydrochloric acid. The reactants were clear,
colorless solution and mixing them produces a clear, colorless final solution and the beaker becomes warm. She knows this reaction
forms liquid water and an aqueous salt based on the neutralization rules as shown by the chemical equation. What physical evidence
indicates that there has been a chemical rea
NaOH(aq) + HCl(aq) - NaClaq) + H2 °C)
图 40)
A)
The solution changes color.
B)
Precipitate formation occurs.
C)
The beaker changes temperature.
D)
Gas bubbles form during the reaction.

Answers

Answer:C

Explanation:

Got it right in usatestprep

The physical evidence that indicates that there has been a chemical reaction is that the beaker changes temperature and the correct option is option C.

What is Neutralization reaction?

Neutralization is a chemical reaction in which acid and base react to form salt and water. Hydrogen (H⁺) ions and hydroxide (OH⁻ ions) react with each other to form water.

The strong acid and strong base neutralization have a pH value of 7.

The beaker gets warm which indicates that the reaction between acid and base is an exothermic reaction releasing heat energy into the surroundings.

Therefore, The physical evidence that indicates that there has been a chemical reaction is that the beaker changes temperature and the correct option is option C.

Learn more about Neutralization reaction, here:

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help me pass this test my last day of school is may 26 if you don’t mind I have more questions :)

Answers

Answer:

equal

Explanation:

Add coefficients to balance the equation to make water.
H2(g) +O2 (g)H20 (1)

Answers

Answer:

2H2+2O2=2H2O

Explanation:

hope this helps

A nebula is often made up of hydrogen and helium gases.
True
False

Answers

Answer:

Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.

Explanation:

Hope this helps

pls help it's about density ​

Answers

1. 100.67
2. 168.55
3. 2.747
So I’m not sure if 2 or 3 are right sorry
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