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3 years ago

14

Fossils can be body parts of ancient organisms, or they can be traces. Give five examples of traces. Help this is due today!!!!!

7 grade

1 answer:

SSSSS [86.1K]3 years ago

6 0

Burrows, tracks, coprolites, nests and footprints are examples of traces that can be found in a fossil.

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icang [17]

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3 0

3 years ago

Magnesium and Iodine will combine to make a compound.

anygoal [31]

Magnesium and I think its MG12 for the other part

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3 years ago

Example 2: Write the slope-intercept form of an equation for the line that passes through (-3.-2) and is perpendicular to y = 4x

Brilliant_brown [7]

Answer:

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8 0

3 years ago

Alveoli are tiny sacs of air in the lungs. Their average diameter is 4.50 × 10−5 m. Calculate the uncertainty in the velocity of

Arisa [49]

<u>Answer:</u> The uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

<u>Explanation:</u>

The diameter of the molecule will be equal to the uncertainty in position.

The equation representing Heisenberg's uncertainty principle follows:

$\Delta x.\Delta p=\frac{h}{2\pi}$

where,

$\Delta x$ = uncertainty in position = d = $4.50\times 10^{-5}m$

$\Delta p$ = uncertainty in momentum = $m\Delta v$

m = mass of oxygen molecule = $5.30\times 10^{-26}kg$

h = Planck's constant = $6.627\times 10^{-34}kgm^2/s^2$

Putting values in above equation, we get:

$4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg\times \Delta v=\frac{6.627\times 10^{-34}kgm^2/s}{2\times 3.14}\\\\\Delta v=\frac{6.627\times 10^{-34}kgm^2/s^2}{2\times 3.14\times 4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg}=4.424\times 10^{-5}m/s$

Hence, the uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

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3 years ago

What is the empirical formula for a compound that is 82.2% nitrogen and 17.8% hydrogen?

Stolb23 [73]

Empirical formula=CH3

3 0

3 years ago