CHEMISTRY HIGH SCHOOL

Calculate the density of a rectangular metal bar that is 7.00 cm long, 4.00 cm wide, and 1.00 cm thick and has a mass of 352 g is?

Answers

Answer 1
Answer: Density is mass divided by volume (d=m/v)
To calculate volume you multiply the length, width, and height of the object (v=lwh)
In this example, we get a product of 28
So 352/28 is 12.57142.... Round to the nearest decimal place indicated in your instructions or keep as is
Answer 2
Answer:

Answer:

12.58 g/cm³

Explanation:

V = 7×4×1 = 28cm³

ρ = m/V = 352/28 ≈ 12.58 g/cm³

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Describe how chemistry is a part of your morning routine?

Answers

Explanation:

There are many examples of chemistry in daily life showing how important chemistry is. For example digestion is based on chemical reaction. In our morning routine we brush our teeth by paste that is a chemical, the soap or shampoo we use is also a chemical. The process of making food is also chemistry that involve chemical reaction.
brushing your teeth uses a chemical to dissolve bacteria, the milk you drink or eat with your cereal is treated with a series of chemical reactions in order for it to sit in tour frindge

Compounds that do not conduct an electric current in either aqueous solution or when molten are referred to as _____.a. electrolyte
b. nonelectrolyte
c. not listed
d. ionic

Answers

The answer is B. Nonelectrolyte. Nonelectrolytes are substances that do not dissociate into ions when dissolved in a solution. In some cases, they dissociate into molecules rather than ions. They are usually polar covalent substances such as sucrose (C12H22O11). Nonelectrolytes are considered to be poor conductors of electricity.

What is 0.001012, 123, & 1.52 in scientific notation

Answers

0.001012=1.012*10^(-3) \n 123=1.23* 10^(2) \n 1.52=1.52* 10^(0)

What is the difference between a homogeneous and a haterogeneous mixture

Answers

a homogeneous mixture has the same uniform appreance, and composition throughout. heterogeneous mixture consists of visibly different substances or phases, that would be your answer to that question.

A photon has a wavelength of 3.8 × 10-7 meters, which is between visible and ultraviolet. Calculate the energy of this photon.

Answers

Answer:

Energy of the photon is 5.2* 10^(-19) J.

Explanation:

Energy of a photon (E) is given by the following equation-

                                              E=(hc)/(\lambda )

Where h is the plank constant, c is the velocity of light and \lambda is the wavelength of photon.

Hence, E=((6.626* 10^(-34)J.s)* (3* 10^(8)m/s))/(3.8* 10^(-7)m)

So, E=5.2* 10^(-19) J

use the equation Energy of photon = h * c / wavelength

where h is Planck constant = 6.62607004 × 10-34 m2 kg / s

c is velocity of light in vacuum = 3.00 × 108 m/s and

wavelength value already you know

Determine the density of CO2 gas at STP.

Answers

The ideal gas law is presented by the equation PV = nRT. n, the number of moles, is equal to mass over molar mass. And density is M/V.

 

PV = nRT

PV = (M/molar mass)RT

P/RT = (1/molar mass)(M/V)

M/V = D = (molar mass)(P/RT)

 

Molar mass of CO2 = 44 g/mol

D = (molar mass)(P/RT)

D = (44 g/mol)(1 atm)/(0.08206 L-atm/mol-K)(273K)

D = 1.964 g/L
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