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3 years ago

When describing velocity what should be included?

Chemistry

2 answers:

Andrei [34K]3 years ago

7 0

Direction and speed. Hope it helps

ioda3 years ago

5 0

Answer:

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).

Other units: mph, ft/s

In SI base units: m/s

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"A crosslinked copolymer consists of 57 wt% ethylene (C2H4) repeat units and 43 wt% propylene (C3H6) repeat units. Determine the

ch4aika [34]

Explanation:

Percentage ethylene by weight = 57%

Percentage propylene by weight = 43%

Suppose in 100 grams of polymer:

Mass of ethylene = 57 g

Mass of propylene = 43 g

Moles of ethylene = $\frac{57 g}{28 g/mol}=2.036 mol$

Moles of propylene = $\frac{43g}{42g/mol}=1.024 mol$

1 mole = $N_A =6.022\times 10^{23}$ molecules/ atoms

Units of ethylene = $2.036 mol\times N_A$

Units of propylene = $1.024 mol\times N_A$

a) Fraction of ethylene units:

$=\frac{2.036 mol\times N_A}{2.306 mol\times N_A+1.024 mol\times N_A}=\frac{509}{765}$

b ) Fraction of propylene units:

$=\frac{1.024mol\times N_A}{2.306 mol\times N_A+1.024 mol\times N_A}=\frac{256}{765}$

3 0

3 years ago

At the equivalence point of a titration of the [H+] concentration is equal to:

icang [17]

B. At the equivalence point of a titration of the [H+] concentration is equal to 7.

<h3>What is equivalence point of a titration?</h3>

The equivalence point of a titration is a point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution.

At the equivalence point in an acid-base titration, moles of base equals moles of acid and the solution only contains salt and water.

At the equivalence point, equal amounts of H+ and OH- ions combines as shown below;

H⁺ + OH⁻ → H₂O

The pH of resulting solution is 7.0 (neutral).

Thus, the pH at the equivalence point for this titration will always be 7.0.

Learn more about equivalence point here: brainly.com/question/23502649

#SPJ1

5 0

2 years ago

Who created the onion model in chemistry?

11111nata11111 [884]

Rick Maurer i think that’s how you spell his last name

8 0

3 years ago

I don’t get it How do you solve the problems

pogonyaev

It would be D, 90.0 g

5 0

3 years ago

Prediction for Scandium (II) and Cl

Nimfa-mama [501]

Answer:

ScCl₂

General Formulas and Concepts:

Chemistry

Reading a Periodic Table
Reaction Prediction
Determining Chemical Compounds

Explanation:

Step 1: Define

Scandium (II)

Step 2: Determine Charges

Sc²⁺

Cl⁻

Step 3: Predict Compound

We need to balance out the charges so the overall charge is 0.

ScCl₂

Step 4: Reaction

RxN: Sc²⁺ + Cl₂ → ScCl₂

3 0

3 years ago