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3 years ago

10

When heat, light, or sound is given off or absorbed, is it a chemical change, chemical property, physical change, or physical pr

operty?

1 answer:

Levart [38]3 years ago

6 0

Physical because it does not change the molecular composition.

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What is 8.3 x 10^4 in standard form

seraphim [82]

Explanation:

83,000 is 8.3x10^4 in standard form

when it's a positive move decimal to the right as many as exponent say

if it's negative move decimal to left and and zeros till you move what exponent says

8 0

2 years ago

use the heisenberg uncertainty principle to calculate the uncertainity in meters in the position of 0.68g and traveling at a vel

My name is Ann [436]

Answer:

7.7439×10⁻³¹ m

Explanation:

The expression for Heisenberg uncertainty principle is:

$\Delta x\times \Delta v=\frac {h}{4\times \pi\times m}$

Where m is the mass of the microscopic particle

h is the Planks constant

Δx is the uncertainty in the position

Δv is the uncertainty in the velocity

Given:

mass = 0.68 g = 0.68×10⁻³ kg

Δv = 0.1 m/s

Δx= ?

Applying the above formula as:

$\Delta x\times 0.1=\frac {6.62\times 10^{-34}}{4\times \frac {22}{7}\times 0.68\times 10^{-3}}$

<u>Δx = 7.7439×10⁻³¹ m</u>

8 0

3 years ago

What is one differrence between a mixture and a compound

Ann [662]

Answer:

A mixture can contain components in any proportions while a compound contains components in fixed proportions. All components in a mixture do not chemically react, while the components in a compound do react and their original properties are lost.

3 0

3 years ago

Electrons move in what is called an atoms electron _______. Plz help me

kupik [55]

Electrons move in what is called an electron cloud. Each atom has its own electron cloud associated with it. This region simply represents an area or likelihood within that an electron of corresponding energy can be found within.

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2 years ago

After 20 min, a reactant has decomposed to 85 % of its original concentration. Which order would the reaction need to be to allo

rjkz [21]

Answer : The value of rate constant is, $0.0949\text{ min}^{-1}$

Explanation :

First we have to calculate the rate constant, we use the formula :

Expression for rate law for first order kinetics is given by:

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant = ?

t = time passed by the sample = 20 min

a = let initial amount of the reactant = 100 g

a - x = amount left after decay process = 100 - 85 = 15 g

Now put all the given values in above equation, we get

$k=\frac{2.303}{20}\log\frac{100}{15}$

$k=0.0949\text{ min}^{-1}$

Therefore, the value of rate constant is, $0.0949\text{ min}^{-1}$

7 0

2 years ago