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3 years ago

Explain how a wedge changes an input force

1 answer:

5 0

It is the ratio of the output force to the input force. A wedge applies more force to the object than the user applies to the wedge, so the mechanical advantage of a wedge is greater than 1. A longer, thinner wedge has a greater mechanical advantage than shorter, wider wedge.

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The rate law for a hypothetical reaction is rate = k [A]2. When the concentration is 0.10 moles/liter, the rate is 2.7 × 10-5 M*

Oksanka [162]

Given:

rate = k [A]2

concentration is 0.10 moles/liter

rate is 2.7 × 10-5 M*s-1

Required:

Value of k

Solution:

rate = k [A]2

2.7 × 10-5 M*s-1 = k (0.10 moles/liter)^2

k = 2.7 x 10^-3 liter per mole per second

5 0

4 years ago

Read 2 more answers

If 15.0 g of nitrogen reacts with 15.0 g of hydrogen, 10.5 g of ammonia is

Alexxx [7]

Answer:

Percent yield = 57%

Explanation:

Given data:

Mass of nitrogen = 15.0 g

Mass of hydrogen = 15.0 g

Mass of ammonia produced = 10.5 g

Percent yield = ?

Solution:

Chemical equation:

N₂+ 3H₂ → 2NH₃

Number of moles of hydrogen:

Number of moles = mass/molar mass

Number of moles = 15.0 g/ 2 g/mol

Number of moles = 7.5 mol

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 15.0 g/ 28 g/mol

Number of moles = 0.54 mol

Now we will compare the moles of ammonia with nitrogen and hydrogen from balance chemical equation.

N₂ : NH₃

1 : 2

0.54 : 2×0.54 = 1.08

H₂ : NH₃

3 : 2

7.5 : 2/3×7.5= 5 mol

Theoretical yield of ammonia:

Mass = number of moles × molar mass

Mass = 1.08 × 17 g/mol

Mass = 18.36 g

Percent yield:

Percent yield = (actual yield / theoretical yield) ×100

Percent yield = (10.5 g/ 18.36 g) ×100

Percent yield = 0.57 ×100

Percent yield = 57%

8 0

3 years ago

100 points! Formation of an Ion

RUDIKE [14]

$\huge\bold {Answer}$

Aluminum ions have a charge of +3. This means that the atoms have three more protons than electrons. In order to add electrons to aluminum ions, the purification process therefore requires a large amount of electricity.

Uncharged Aluminum atom must need to lose it's electrons,in order to form the bond with oxygen which has vacant orbitals

ion
atom that has a positive or negative charge because it lost or gained one or more electrons

chemical bond
the attractive force that holds atoms or ions together

ionic bond
a chemical bond in which one atom loses an electron and the other atom gains electrons to form ions

chemical formula
a combination of chemical symbols and numbers to represent a substance

covalent bond
bond formed by the sharing of electrons between atoms

Thanks

5 0

3 years ago

Read 2 more answers

A car with constant speed travelso 150 km in 7200 seconds what is the speed of the car

liberstina [14]

7200sec÷60sec in a minute÷60minutes in an hour=2hours. 150km÷ 2 hours= 75 km/hour

4 0

3 years ago

Explain the economic features of gandaki province

mote1985 [20]

Answer:

there are many valleys and mountain in this region