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3 years ago

Describe the life of a damselfly

2 answers:

6 0

Life Span. The life span of damselflies varies between species and within species depending on environmental factors. After one to three weeks, the eggs, laid in water, usually hatch, releasing the larvae or nymphs, but eggs laid in late summer may overwinter before hatching.

antiseptic1488 [7]3 years ago

3 0

<span>Dragonflies and damselflies have a fascinating life history. Most their life is spent underwater, first as an egg and then as a larva (or nymph) and they have a comparatively short adult life, being "on the wing" for a few weeks only.

Hope this helps :)</span>

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If He gas has an average kinetic energy of 4310 J/mol under certain conditions, what is the root mean square speed of O2 gas mol

Free_Kalibri [48]

Answer:

The root mean square speed of O2 gas molecules is

<u></u>

Explanation:

The root mean square velocity :

$v_{rms}=\sqrt{\frac{3RT}{M}}$

$K.E_{avg}=\frac{3}{2}RT$

$K.E =\frac{1}{2}mv_{rms}^{2}$

Molar mass , M

For He = 4 g/mol

For O2 = 2 x 16 = 32 g/mol

O2 = 32/1000 = 0.032 Kg/mol

First calculate the temperature at which the K.E of He is 4310J/mol

K.E of He =

$K.E_{avg}=\frac{3}{2}RT$

$T=\frac{2(K.E)}{3(R)}$

K.E of He = 4310 J/mol

$T=\frac{2(4310J/mol)}{3(8.314J/Kmol)}$

$T=345.60K$

<u>Now , Use Vrms to calculate the velocity of O2</u>

$v_{rms}=\sqrt{\frac{3(8.314J/Kmol)(345.60K)}{0.032Kg/mol}}$

$v_{rms}=\sqrt{\frac{8619.9552}{0.032}}$

$v_{rms}=\sqrt{26935.001}$

$v_{rms}=519.01m/s$

6 0

3 years ago

What is the basic form for the names of ionic compounds containing a metal that forms more than one type of ion?

professor190 [17]

Answer:

Metal (appropriate charge on metal) nonmetal-ide

Explanation:

1) Write the name of transition metal as shown on the Periodic Table.

2) Write the name and charge for the non-metal.

Use the total charge on the non-metal (or polyatomic ion) find the charge on the transition metal.

3) After the name for the metal, write its charge as a Roman Numeral in parentheses. Example: Iron (II) chloride.

8 0

2 years ago

Why is helium considered as a noble gas

dolphi86 [110]

Noble gases are known for having a full outer shell of electrons which helium has as it has two electrons its first electron shell is completely filled

7 0

2 years ago

Read 2 more answers

What is the mass, in grams, of each of the following

MaRussiya [10]

Answer:

Gram atomic mass is another term for the mass, in grams, of one mole of atoms of that element. "Gram atom" is a former term for a mole. ... This is a dimensionless quantity (i.e., a pure number, without units) equal to the molar mass divided by the molar mass constant

Explanation:

7 0

2 years ago

How many moles is 50g of CaCO3?

Neko [114]

$\huge\underline\mathbb\pink{♡Your Answer♡}$

Formula mass of CaCO3 is

40 + 12 + 3-100amu....

100g CaCO3 = 1 mole..

50g of CaCO3 = 1÷ 100x 5 = 0.5mole...

<h3>Hence ,answer is 0.5mole...</h3>

Hope it helps you..

Thanks...

3 0

2 years ago