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Liula [17]
2 years ago
7

Plzz help 15 points List the fossils in order from oldest to youngest in the diagram. What can you conclude about

Chemistry
1 answer:
Fed [463]2 years ago
7 0
A= Molds and cast fossils
B= Petrification Fossils
C= Whole Body Fossils
D= Footprints and Trackways
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Tetrachloromethane,CC15,is classified as a
prohojiy [21]
Correct Answer: compound because the atoms of the elements are combined in a fixed proportion.
7 0
3 years ago
Electrons can jump between energy levels but can never be found in what energy level
yawa3891 [41]

Answer:

Electrons can jump from energy level to energy level (for example energy level 1 to 2) but they can NEVER be found in between energy levels.

6 0
2 years ago
4 Elliot has some stearic acid. It is in the solid state.
Ahat [919]

Answer:

it is in solid state

Explanation:

at 100% heat

6 0
3 years ago
What mass of zinc is needed to react with 23.1 g of phrosphoric acid according tot he equation?
Hitman42 [59]

<u>Complete Question:</u>

what mass of zinc is needed to react with 23.1 g of phosphoric acid according tot he equation?

3 Zn + 2 H₃PO₄ = 3 H₂ + Zn₃(PO₄)₂

<u>Answer:</u>

22.98 g, the mass of zinc (Zn) is needed to react with 23.1 g of phosphoric acid according to the given equation.

<u>Explanation:</u>

Given chemical reaction:

           3 Zn + 2 H₃PO₄ = 3 H₂ + Zn₃(PO₄)₂

If the substance’ molecular weight is the number of grams required per mole, the number of moles expressed as a given quantity of substances shall correspond to the grams of that substance divided by the molecular weight. Hence,

              \text {number of moles}=\frac{\text {mass}}{\text {molar weight}}

To find no. of moles of phosphoric acid:

Given:

mass of phosphoric acid = 23.1 g

molar weight of of phosphoric acid = 97.994 = 98 g/mole

Therefore,

no. of moles of phosphoric acid =\frac{23.1}{98}=0.2357 \text { moles }

Look into the given chemical reaction and divide as the following:

If 2 moles of H₃PO₄ reacts with 3 moles of Zn then 0.2357 moles of H₃PO₄ reacts with X moles of Zn. Then,

   \text { X moles of } \mathrm{Zn}=\frac{(0.2357 \times 3)}{2}=\frac{0.707}{2}=0.3535 \text { moles of } \mathrm{Zn}

Now, calculate mass of zinc as follows, we know

molar mass of zinc is 65 g/mol

 mass\ of\ zinc = number\ of\ moles \times molar\ weight =0.3535 \times 65

Mass of zinc = 22.98 g

7 0
3 years ago
A pitcher throws a 142 g baseball, which accelerates at a speed of 9 m/s^2. How much force does the pitcher apply to the ball?
VLD [36.1K]

Answer:

<h3>The answer is 1.28 N</h3>

Explanation:

The force acting on an object given the mass and acceleration we use the formula

<h3>force = mass × acceleration</h3>

From the question

mass = 142 g = 0.142 kg

acceleration = 9 m/s²

We have

force = 0.142 × 9 = 1.278

We have the final answer as

<h3>1.28 N</h3>

Hope this helps you

6 0
3 years ago
Read 2 more answers
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