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AVprozaik [17]
3 years ago
15

A bluebird lives in a maple tree. It builds a nest in the tree, where its eggs can be protected from the harsh environment. This

is an example of:
Chemistry
1 answer:
zysi [14]3 years ago
4 0

Answer:

commensalism

(hope i spelled that right)

Explanation:

if the bird only nest in it and

the tree isn't really bothered or affected by the bird.

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Scientists use this technology to map the human genome.
Luden [163]
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8 0
3 years ago
Read 2 more answers
1. Find at least 3 elements named after countries
Kazeer [188]

Answer:

1. Elements named after Countries or Places

Americium

Am

Made in 1945 at Chicago USA

Berkelium

Bk

Made in 1950 at the University of California, Berkeley, USA

Californium

Cf

Made in 1950 at the University of California, Berkeley, USA

Copper

Cu

The Romans were the biggest users of copper. Their source of copper was the island of Cyprus. Their name for the island was "Cyprium". They called the metal "Aes Cyprium" - metal of Cyprus. The name became shortened to Cyprium which then became "Cuprum" from which copper gains its modern day symbol.

Francium

Fr

Discovered in 1939 at the Curie Institute, Paris, France.

Gallium

Ga

Named after the Latin name for France - Gallia

Germanium

Ge

Discovered in 1886 by a German Chemist - Winkler.

Polonium

Po

Discovered in 1898 by Marie Curie, who was Polish.

Scandium

Sc

Discovered and mined in Scandinavia

Strontium

Sr

Named after Strontian, a small village in the Western Highlands of Scotland.

__________________________________________________________

4. Elements named after Planets

Helium

He

From the Greek word "Helios" - the Sun. In 1868 during an eclipse of the Sun, Scientists observed a spectral line caused by an unknown element. They named the element Helium. Twenty seven years later in 1895, the element was discovered on Earth.

Neptunium

Np

Named after the planet Neptune. Find the position of the three planets Neptune, Pluto, and Uranus in the Solar system. Now find the position in the Periodic Table of the three elements named after these planets...

Plutonium

Pu

Named after the planet Pluto

Uranium

U

Named after the planet Uranus. The element was discovered in 1789, shortly after the discovery of the planet.

Elements named from Mythology

Tantalum

Ta

Named after the Greek mythological king, Tantalus. It was discovered in 1802 and great difficulties were encountered in dissolving its oxide in acid to form salts. It proved to be a tantalizing problem!

Niobium

Nb

Named after Princess Niobe, the daughter of King Tantalus. According to legend, father and daughter were always found together and were very much alike. The two elements Niobium and Tantalum are usually found together in nature and their properties are very similar. Niobium was discovered in North America in 1801 and was originally named Columbium. It was renamed in 1844 after the connections with tantalum was realized. Find the positions of both elements in the periodic table

Thorium

Th

Named after Thor, the Scandinavian God of War and Thunder. It was discovered and named in 1828. Coincidentally, thorium is used today as a nuclear fuel in nuclear weapons and reactors.

Titanium

Ti

Named after Titans, the Greek supermen. Titanium is an extremely strong metal which resists attack by acids.

Vanadium

V

Named after Vandis, the Scandinavian Goddess of Beauty. The salts of vanadium have beautiful colors.

3. Elements named after Famous Scientists

Curium

Cm

Made in 1944 at Chicago. It was named in honor of Marie and Pierre Curie.

Einsteinium

Es

Made in 1952 at the University of California. It was named in honor of Albert Einstein.

Lawrencium

Lw

All of the man-made elements have been made as a result of the Nuclear Age. The majority of these elements were made at the University of California USA, in a machine called the Cyclotron. The Cyclotron was invented by Professor Ernest Lawrence. Lawrencium was made at the University of California in 1961 and named in his honor.

Mendelevium

Md

Made in 1955 at the University of California. It was named after a world famous Russian Chemist Dimitri Mendeleev.

------------------------------------

8. The chemical symbol for lead is Pb, which comes from the Latin word plumbum, meaning "waterworks," referring back to ancient times when the metal was widely used in the construction of water pipes.

**** MORE ANSWERS ARE UNDER THE QUESTION -- Scroll all the way up ****

I hope this helps!

8 0
3 years ago
What will happen to the pressure inside a closed container of gas if more gas is added to the container?
Novay_Z [31]
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5 0
3 years ago
Calculate the number of particles in 8grams of oxygen molecule
lana [24]
Moles of oxygen = mass/molar mass of O2 = 8/31.998 = 0.25 moles.

Number of particles = moles x 6.02 x 10^23 = 0.25 x 6.02 x 10^23 = 1.505 x 10^23 particles.

Hope this helps!
5 0
3 years ago
A gas occupies 3.8 L at -18° C and 975. torr. What volume would this gas occupy at STP?
Aleks04 [339]

To solve the question we will assume that the gas behaves like an ideal gas, that is to say, that there is no interaction between the molecules. Assuming ideal gas we can apply the following equation:

PV=nRT

Where,

P is the pressure of the gas

V is the volume of the gas

n is the number of moles

R is a constant

T is the temperature

Now, we have two states, an initial state, and a final state. The conditions for each state will be.

Initial state (1)

P1=975Torr=1.28atm

V1=3.8L

T1=-18°C=255.15K

Final state(2), STP conditions

P2=1atm

T2=273.15K

V2=?

We will assume that the number of moles remains constant, so the nR term of the first equation will be constant. For each state, we will have:

\begin{gathered} \frac{P_1V_1}{T_1}=nR \\ \frac{P_2V_2}{T_2}=nR \end{gathered}

Since nR is the same for both states, we can equate the equations and solve for V2:

\begin{gathered} \frac{P_{2}V_{2}}{T_{2}}=\frac{P_1V_1}{T_1} \\ V_2=\frac{P_{1}V_{1}}{T_{1}}\times\frac{T_2}{P_2} \end{gathered}

We replace the known values:

V_2=\frac{1.28atm\times3.8L}{255.15K}\times\frac{273.15K}{1atm}=5.2L

At STP conditions the gas would occupy 5.2L. First option

8 0
1 year ago
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