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Yuri [45]
3 years ago
9

Im sorry if its difficult to read

Chemistry
1 answer:
anzhelika [568]3 years ago
6 0

Answer:

A ball is thrown straight up from a rooftop 320 feet high. The formula below describes the ball's height above the ground, h, in feet, t seconds after it was thrown. The ball misses the rooftop on its way down and eventually strikes the ground. How long will it take for the ball to hit the ground? Use this information to provide tick marks with appropriate numbers along the horizontal axis in the figure shown.

h=-16t^2+16t+320

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Phenolphthalein is used as a visual indicator in a strong acid-strong base titration because
marysya [2.9K]
A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions. ... It is known as the titrant.
3 0
3 years ago
An inventor claims to have devised a closed cyclic engine which exchanges heat with cold and hot reservoirs at 25 and 350 ◦C, re
kati45 [8]

Explanation:

The given data is as follows.

T_{c} = 25^{o}C,  T_{h} = 350^{o}C

Work produced per kJ of heat extracted from hot reservoir = 0.45 kJ = Efficiency

If the device is Carnot cycle then its efficiency will be maximum and its value will be equal to [1 - (\frac{T_{c}}{T_{h}} )]

Using this relation we will calculate the efficiency as follows.

                 Efficiency = [1 - (\frac{T_{c}}{T_{h}} )]

                        = 1 - (\frac{25}{350})

                       = 0.928

Hence, it means that this type of device is possible and the claim is also believable.

7 0
3 years ago
Which of the following is an incorrect name for an acid? A. acetic acid B. hydrocarbonate acid C. hydrocyanic acid D. sulfurous
just olya [345]

Answer:

The answer to your question is letter B

Explanation:

Incorrect name

A. acetic acid               This name is correct for the acid with formula CH₃COOH

B. hydrocarbonate acid  This is not the name for acid but for a molecule that has hydrogen and a metal.  

C. hydrocyanic acid   This name is correct for the inorganic molecule with formula HCN

D. sulfurous acid          This name is correct and is the name of the inorganic molecule with formula H₂SO₃.

E. phosphoric acid       This name is correct for the acid with formula H₃PO₄.

5 0
3 years ago
At a particular temperature, 12.0 moles of so3 is placed into a 3.0-l rigid container, and the so3 dissociates by the reaction 2
saul85 [17]
            2 SO₃ --> 2 SO₂ + O₂
I             12             0          0
C           -2x           +2x      +x
---------------------------------------------
E         12-2x          2x         x

Since the moles of SO₂ at equilibrium is 3 mol, 2x = 3. Then, x = 1.5 mol. So, the amounts at equilibrium is:
SO₃: 12 - 2(1.5) = 9
SO₂: 2(1.5) = 3
O₂: 1.5

The formula for K basing on the stoichiometric reaction is:
K = [SO₂]²[O₂]/[SO₃]² 
where the unit used is conc in mol/L.

K = [3 mol/3 L]²[1.5 mol/3 L]/[9 mol/3 L]²
<em>K = 0.0556</em>
4 0
3 years ago
How might the government make sure scientific research is done in an ethical<br> way?
antiseptic1488 [7]

Answer:

They could possibly make daily check ups to the research facility?

7 0
2 years ago
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