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3 years ago

What causes velocity to change?

Chemistry

1 answer:

Aleonysh [2.5K]3 years ago

6 0

Acceleration. Due to Gravity and how heavy the object is.

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In 2 hours a bicyclist traveled 75 kilometers. What was the bicyclist's average speed?

sleet_krkn [62]

Answer:

37.5 miles per hour....

7 0

3 years ago

Which of the following pairs of elements is most likely to form an ionic compound? a oxygen and fluorine b sodium and aluminum c

irina [24]

An ionic compound consists of a metal AND a non-metal.

<em>Option A:</em>

Oxygen and fluorine are non-metals.

<em>Option B:</em>

Sodium and aluminium are non-metals.

<em>Option C:</em>

Calcium is a metal and chlorine is a non-metal.

<em>Option D:</em>

Nitrogen and sulfur are non-metals.

Thus, the answer is C.

4 0

3 years ago

Draw the Lewis Dot structure for the following diprotic acid: HOOC-(CH2)4-COOH. 35.50 mL of this acid is titrated to end point w

Sliva [168]

hey there!:

Attached resolution.

5 0

3 years ago

Osmosis occurs when two solutions of different concentrations are separated by a semipermeable membrane. The membrane allows sol

Finger [1]

Answer:

Part A → 7.82 atm

Part B → The unknown solution had the higher concentration

Part C → 0.83 mol/L

Explanation:

Part A

Osmotic pressure (π) = M . R. T . i

NaCl → Na⁺ + Cl⁻ (i =2)

0.923 g of NaCl must be dissolved in 100 mL of solution.

0.923 g / 58.45 g/m = 0.016 moles

Molarity is mol/L → 0.016 m / 0.1L = 0.16M

π = 0.16M . 0.08206 L.atm/molK . 298K . 2 ⇒ 7.82atm

Part. B

The solvent moves toward the solution of higher concentration (to dilute it) until the two solutions have the same concentration, or until gravity overtakes the osmotic pressure, Π. If the level of the unknown solution drops when it was connected to solution in part A, we can be sure that had a higher concentration.

Part. C

π = M . R . T

20.1 atm = M . 0.08206 L.atm/mol.K . 294K

20.1 atm / (0.08206 L.atm/mol.K . 294K) = 0.83 mol/L

8 0

3 years ago

More accurate dates of the reigns of ancient Egyptian pharaohs have been determined recently using plants

ArbitrLikvidat [17]

King Tut's reign came to an end at 3350 years ago

<h3>Further explanation</h3>

Carbon-14 is a radioactive isotope that can decay. This isotope can be used to determine how long ago an organism died by knowing the ratio from 12C to 14C

Can be formulated

$\tt Nt=No\dfrac{1}{2}^{t/t1/2}$

Or we can use :

$t=-\frac{1}{\lambda }\text{ln}\left(\frac{{N}_{t}}{{N}_{0}}\right)\longrightarrow t=-\frac{1}{\lambda }\text{ln}\left(\frac{{\text{Rate}}_{t}}{{\text{Rate}}_{0}}\right)$

The half-life of C-14, 5730 years, so the decay constant :

$\tt \lambda =\dfrac{\text{ln 2}}{{t}_{1\text{/}2}}=\dfrac{0.693}{\text{5730 y}}=1.21\times {10}^{-4}}$

Assume the initial C-14 activity was 13.6 disintegrations/min/g of C

$\tt t=-\dfrac{1}{\lambda }\text{ln}\left(\dfrac{{\text{Rate}}_{t}}{{\text{Rate}}_{0}}\right)=-\dfrac{1}{1.21\times {10}^{-4}}\text{ln}\left(\dfrac{9.07}{13.6}\right)=\text{3348}\approx 3350~y$

7 0

3 years ago