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Aleks04 [339]
3 years ago
6

All the simple machines make work easier to do by changing the _____ or _____ of a force. A. size; type B. work; type C. size; d

irection D. type; direction
Chemistry
1 answer:
REY [17]3 years ago
8 0

Answer:

C. size; direction

Explanation:

By definition, a machine is referred to any device that makes work easier. It takes force to do work, hence, work refers to the application of force over a particular distance. A machine aims at making the work easy by changing how it is done. Simple machines, which include: levers, pulleys, inclined planes etc. all carry out the same thing, which is to make work easier, by changing the size/magnitude and direction of the applied force.

A simple machine tends to change the size of the inputted force by increasing it over a shorter distance. The machine increases the force applied better than it can be done manually e.g. a plier and nutcracker increases/changes the applied force better than it can be done with bare hands.

Also, a simple machine can achieve making work easier by changing the direction at which the force is applied. The machine applies the force on the object in an opposite direction or contrary to the way it was manually applied.

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For an alloy that consists of 93.1 g copper, 111.7 g zinc, and 4.0 g lead, what are the concentrations of (a) Cu, (b) Zn, and (c
Andrew [12]

Answer:

(a) weight percent of Cu = 44.59%

(b) weight percent of Zn = 53.49%

(c) weight percent of Pb = 1.91%

Explanation:

Given: Alloy contains- Cu=93.1 g, Zn=111.7 g, Pb=4.0 g

Therefore, the total mass of the alloy (m) = mass of Cu (m₁) + mass of Zn (m₂)+ mass of Pb (m₃)

m= 93.1 g + 111.7 g + 4.0 g = 208.8 g

(a) weight percent of Cu = (m₁ ÷ m)× 100% =  (93.1 g ÷ 208.8 g)× 100% =44.59%

(b) weight percent of Zn = (m₂ ÷ m)× 100% =  (111.7 g ÷ 208.8 g)× 100% =53.49%

(c) weight percent of Pb = (m₃ ÷ m)× 100% =  (4.0 g ÷ 208.8 g)× 100% =1.91%

5 0
3 years ago
What is the equilibrium constant for I2+Cl2=2ICl if I2=0.50m,Cl2=o.60m and ICl=5.0
Murljashka [212]

Answer:

0.5

Explanation:

because equilibrium constant is products over reactants

substituting values will give you 0.5

8 0
2 years ago
Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine
dolphi86 [110]

Answer:

The pH of saturated solution of the quinine is 10.05

Explanation:

Quinine (Q) is C20H24N2O2 has a molar mass of 324.4 g/mol

Q can behave as a weak base. Kb and pKb can be calculated for weak bases

pKb1 is to be considered when solving the question.

pKb1 = 5.1

Step 1 : Calculate the Kb of Quinine

            pKb1 = - log [kb]

                5.1  = - log [kb]

                take Antilog of both side

             [kb] = 7.94 x 10∧-6

Step 2: Calculate the concentration of saturated solution of Q in mol/dm3

           From the question, 1900 ml of solution contains 1 g of Q

           Therefore,  1000 ml of solution will contain........... x g of Q

           x = 1000 /1900

           x = 0.526 g in 1 dm3

In calculating concentration in mol/dm3,

Concentration in mol/dm3 = concentration in g /dm3 divided by molar mass

Molar mass of Q = 324.4

Concentration in mol/dm = 0.526 /324.4

                                         = 0.0016 mol/dm3

Step 3: Calculating the Concentration of OH-

            At Equilibrium, Kb = x² / 0.0016

            7.94 x 10∧-6 = x² / 0.0016

            x = √ 0.0016 × 7.94 x 10∧-6

            x = 1. 127 × 10∧-4 mol/dm3

The concentration of OH- = 1. 127 × 10∧-4 mol/dm

Step 4:  Calculating the pH of Quinine

           Recall, pOH = - log [OH-]

           pOH = - log [1. 127 × 10∧-4]

           pOH = 3.948

           Also recall that pH + pOH = 14

           pH = 14 - 3.948

           pH = 10.05

           

8 0
3 years ago
A student measures the mass of 40 mL of a liquid 3 times. They obtain mass readings of 28.5 g,
algol [13]

It can be said that the measurements of the students are precise but not accurate.

<h3>What is accuracy and precision?</h3>

Accuracy is the degree of conformity of a measure to a true or standard value while precision is the ability of a measurement to be reproduced consistently.

Simply put, measurements are said to be accurate when they are close to a true or standard value but are said to be precise when they are close to one another.

According to this question, a student measures the mass of 40 mL of a liquid 3 times and obtained the following mass readings: 28.5g, 28.4g and 28.2g.

Based on the measurement, the measured data are precise because they are close to one another but are not accurate because they are not near the standard value of 37.9g.

Learn more about precision and accuracy at: brainly.com/question/15276983

#SPJ1

4 0
1 year ago
An element with 20 protons and 20 electrons gains one electron. the electron goes into what type of orbital?
katrin2010 [14]
  3d

 <span>20 electrons means that the one 4s orbital is filled up. Then the electrons will fill up the five 3d orbitals and finally the three 4p orbitals to complete energy level 4 </span>
8 0
3 years ago
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