CHEMISTRY HIGH SCHOOL

A particular reactant decomposes with a half‑life of 109 s when its initial concentration is 0.280 M. The same reactant decomposes with a half‑life of 231 s when its initial concentration is 0.132 M. 1. Determine the reaction order.
(A)1
(B)2
(C)0
2. What is the value and units of the rate constant for this reaction? ????=

Answers

Answer 1
Answer:

Answer:

The order of reaction is 2.

Rate constant is 0.0328 (M s)⁻¹

Explanation:

The rate of a reaction is inversely proportional to the time taken for the reaction.

As we are decreasing the concentration of the reactant the half life is increasing.

a) For zero order reaction: the half life is directly proportional to initial concentration of reactant

b) for first order reaction: the half life is independent of the initial concentration.

c) higher order reaction: The relation between half life and rate of reaction is:

Rate =

Half life =

where n = order of reaction

Putting values

Hence n = 2

Putting values

K = 0.0328


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MIDDLE SCHOOL

A sample of 0.500 moles of gas is placed in a container of volume of 2.50L. What is the pressure of the gas in ATM if the gas is at 25 degrees celcius

Answers

The  pressure  of  gas  at   ATm  is calculated  using  ideal  gas    equation
that  is Pv  =nRT
P  =  pressure  =?
v=  volume =  2.5  l
n= moles  =  0.500moles
T=  temperature  in  kelvin =  25 +273  =  298k
R=  gas  constant  =  0.082 l.atm/k.mol

p  is therefore =  nRT/V
p  =  (0.5  mol x0.082  l.atm/k.mol  x298k) /(  2.5l)  =  4.89  atm
MIDDLE SCHOOL

a radio controlled airplane is moving at a velocity of 23 m/s. it accelerates to a velocity of 85 m/s in 9.3 seconds. what acceleration did the airplane experience?

Answers

I will show you a method to find a velocity of anything:-


Find average velocity when acceleration is constant.

Set up an equation with position and time instead.

Find the distance between the start and end points.

Calculate the change in time.

Divide the total displacement by the total time.

Solve problems in two dimensions.

HIGH SCHOOL

What is the function of the "collision theory" model?

Answers

You got it, reactant must collide in proper orientation and with enough energy. Imagine you double concentration, you are doubling the amount of reactant thus giving more collision at the molecular level thus increasing the reaction rate. 

Hope that help.

Answer:

Reactant must collide in proper orientation and with enough energy

Explanation:

COLLEGE

Nitric acid reacts with insoluble copper(II) oxide to form soluble copper(II) nitrate, Cu(NO3)2, a compound that has been used to prevent the growth of algae in swimming pools. Write the balanced chemical equation for the reaction of an aqueous solution of HNO3 with CuO. (Include states-of-matter under the given conditions in your answer. Use the lowest possible whole number coefficients.)

Answers

Answer:

Explanation:

CuO(s) + 2HNO3(l)  ----> Cu(NO3)2(l)  + H2O(l).

HIGH SCHOOL

What exactly is an explosion

Answers

An explosion is a sudden release of enormous energy, being released all at once, particularly from a trapped container. The enormous amount of energy being released expands rapidly, more than the air can adjust around them, which makes the sound you hear and the fast light that you see is the energy being released.
HIGH SCHOOL

What quantity is represented by the metric system prefix deci-

Answers

In the metric system, deci- is used to show the quantity that is equal to one tenth of the main unit. A deciliter is a tenth of a liter

Answer:

.1

Explanation:

COLLEGE

What is inaccurate about describing a solution as containing or using free hydrogen atoms?

Answers

Answer: An aqueous solution will contains both hydrogen ion and hydroxide ion.An here we are talking about free hydrogen ions, which means the description will be related to the pH. If the ratio of ion are equal then the pH will be 7 i.e. neutral. But if there are free hydrogen atoms in the solution we have, the pH of solution will be less than 7 and the solution will be described ad acidic. So the inaccurate description for a solution containing free hydrogen ion is that it is basic in nature.

MIDDLE SCHOOL

How many grams of CO(g) are there in 74.5 mL of the gas at 0.933 atm and 30o C?

Answers

Answer:

As per the given statement:

Using ideal gas law equation:

where

P represents the Pressure of a gas

V represents the Volume it occupies

R represents the Universal constant , usually given as:

R = 0.082 atm L/ mol k

First convert Celsius into Kelvin.

T = 273 + 30 = 303 K

Use conversion:

1 L = 1000 mL

V = 74.5 mL = L

Now substitute the given values we have;

Simplify:

n = 0.00279757305

or

n ≈0.0028 moles.

Since carbon monoxide, CO has molar mass of 28.01 g/mol

then;

g

Therefore, 0.078 g of CO(g) are there  in 74.5 mL of the gas at 0.933 atm and 30 degree C


HIGH SCHOOL

Which conclusion was a direct result of the gold foil experiment? (1) An atom is mostly empty space with a dense, positively charged nucleus.
(2) An atom is composed of at least three types of subatomic particles.
(3) An electron has a positive charge and is located inside the nucleus.
(4) An electron has properties of both waves and particles.

Answers

They determined that (1) An atom is mostly empty space with a sense, positively charged nucleus, because most particles passed straight through the gold foil, but occasionally they would deflect, sometimes by a very large margin
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