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3 years ago

Which of the following fossils are trace fossils?

Chemistry

2 answers:

Anastasy [175]3 years ago

6 0

Answer:

idk

Explanation:

idk

baherus [9]3 years ago

4 0

Trace fossils may consist of impressions made on or in the substrate by an organism: for example, burrows, borings, footprints and feeding marks, and root cavities. Trace fossils contrast with body fossils, which are the fossilized remains of parts of organisms' bodies, usually altered by later chemical activity or mineralization.

Hope this helps! :D

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Determine the partial negative charge on the bromine atom in a c−br bond. the bond length is 1.93 å and the bond dipole moment i

vaieri [72.5K]

Answer:

The value is $x = 0.151 \ e$

Explanation:

From the question we are told that

The bond length is $l = 1.93\ \r a = 1.93 *1 *10^{-10} =1.93 *10^{-10}\ m$

The bond dipole moment is $\mu = 1.40 d = 1.40 * 3.33564 *10^{-30} = 4.6699 *10^{-30} \ C \cdot m$

Generally the dipole moment is mathematically represented as

$\mu = Q * l$

Here Q is the partial negative charge on the bromine atom

$Q = \frac{\mu}{ l}$

=> $Q = \frac{4.6699 *10^{-30}}{ 1.93 *10^{-10} }$

=> $Q = 2.42 *10^{-20} C$

Generally

1 electronic charge(e) is equivalent to $1.60*10^{-19} C$

So x electronic charge(e) is equivalent to $Q = 2.42 *10^{-20} C$

=> $x = \frac{2.42 *10^{-20}}{1.60*10^{-19} }$

=> $x = 0.151 \ e$

3 0

3 years ago

Several constructive processes helped build mountains on Earth. All BUT one of these is a way mountains can be built. That is A)

Naddik [55]

It is landslides i got it right on the test

7 0

4 years ago

How many molecules are in 15.0 milliliters of ethanol (C2H3OH)(The density of ethanol is 0.789 g/mL)

Kryger [21]

Answer:

1.57×10²³ molecules

Explanation:

Given data:

Number of molecules of ethanol = ?

Volume of ethanol = 15.0 mL

Density of ethanol = 0.789 g/mL

Solution:

Mass of ethanol :

Density = mass/ volume

0.789 g/mL = mass/ 15.0 mL

Mass = 0.789 g/mL× 15.0 mL

Mass = 11.84 g

Number of moles of ethanol:

Number of moles = mass/molar mass

Number of moles = 11.84 g / 46.07 g/mol

Number of moles = 0.26 mol

1 mole contain 6.022×10²³ molecules

0.26 mol × 6.022×10²³ molecules / 1mol

1.57×10²³ molecules

5 0

3 years ago

First: Calculate the number of moles of Kool-Aid powder needed to make 100mL of a 0.1M solution.

morpeh [17]

For this question, we can use the molarity formula, which is as follows:

$Molarity= \frac{moles}{Liters}$

We know that we want a 0.1M solution in 100 mL, so we can plug those into the equation to find the number of moles required:

$0.1M= \frac{moles}{0.1L}$
$moles=0.01$

So now we know that the number of moles of the Kool-Aid powder is 0.01. We also know that the chemical formula for this powder is $C_{12} H_{22} O_{11}$ .

We can find the molar weight of this powder by taking the atomic weight from the periodic table and multiply it by the number of atoms in the compound. Let's find the molar weight of the powder:

Find the atomic weight of carbon:

$C=12.01 g$

There are 12 C's, so we multiply by 12:

$12.01g*12=144.12g$

Then we have 22 H's, each having an atomic weight of 1.008g:

$1.008g*22=22.18g$

And finally there are 11 O's, each with an atomic weight of 15.99g:

$15.99g*11=175.89g$

Then we add up all of the weights:

$144.12g+22.18g+175.89g=342.19g$ -> So we know that the molar weight of the Kool-Aid powder is 342.19g.

Now we can find the amount of grams that we need for the desired solution as follows:

$\frac{342.19g}{1mol}* \frac{0.01mol}{1}=3.42g$

So now we know that we need 0.01 moles of the powder, and we need 3.42g of the powder to make the desired solution.

7 0

3 years ago

So anyone know the answer to this

abruzzese [7]

Answer:

Exosphere

Explanation:

it’s the furthest away from the earths surfest which would make it furthest away from earths center.

4 0

3 years ago