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4 years ago

7

HELP!!! When fat comes in contact with sodium hydroxide, it produces soap and glycerin. Determine whether this is a physical cha

nge or a chemical change. Explain your answer.

1 answer:

dimaraw [331]4 years ago

5 0

Answer:it's a chemical change.physical changes occur without 2 or more reactants,a reaction,and a product

Explanation:

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The specific heat of copper is 0.39 j/g*degrees celcius how much heat is needed to raise the temperature of 1000.0 g of copper f

lapo4ka [179]

In order to calculate the amount of energy needed, we will apply:
heat energy = mass x specific heat capacity x change in temperature
Q = mcΔT

Substituting the given values,
Q = 1000 x 0.39 x (45 - 25)
Q = 7,800 Joules of heat energy are needed

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3 years ago

A gas has an initial volume of 168 cm3 at a temperature of 255 K and a pressure of 1.6 atm. The pressure of the gas decreases to

denis23 [38]

I do not have a calculator, but let’s think...

Imagine a ballon with a certain amount of gas. When you decrease the volume by squeezing the balloon, you increase the pressure.

Which means volume is inversely proportional to the pressure:
PV=PV

Now to speed things up because class is about to start :/

PV/T=PV/T, I think

Tip: check your units and any questions let me know

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3 years ago

When drawing ray diagrams involving thin lenses, how many rays (at a minimum) are needed show the image distance and magnificati

Rufina [12.5K]

Answer:

GGG he fggfggfufbvg I Rd cbh

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4 years ago

Calculate the wavelength (in nm) of light that produces its first minimum at an angle of 21.0° when falling on a single slit of

Cerrena [4.2K]

To solve this problem it is necessary to apply the related concepts to the principle of overlap, specifically to single slit diffraction experiment concept.

Mathematically this can be expressed as:

$dsin\theta = m\lambda$

Where,

d = Width of the slit

$\lambda =$ Wavelength

$\theta =$ Angle relative to the original direction of the light

m = Any integer which represent the order of the equation (number of repetition of the spectrum)

To solve the problem we need to rearrange the equation and find the wavelength

$\lambda = \frac{dsin\theta}{m}$

Our values are given as,

$d = 1.46\mu m = 1.46*10^{-6}m$

$\theta = 21\°$

$m = 1$

Replacing in our equation we have,

$\lambda = \frac{dsin\theta}{m}$

$\lambda = \frac{(1.46*10^{-6})sin(21)}{1}$

$\lambda = 5.232*10^{-7}m$

$\lambda = 523.2nm$

Therefore the wavelength is 523.2nm

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4 years ago

Magnitude of u = 15, direction angle θ = 35° Magnitude of v = 18, direction angle θ = 60° Find the magnitude and direction angle

djverab [1.8K]

Answer:

32.225 and angle is 48.7 degree.

Explanation:

u = 15, θ = 35 degree

v = 18, θ = 60

First represent the u and v in vector form.

u = 15 (Cos 35 i + Sin 35 j ) = 12.287 i + 8.6 j

v = 18 ( Cos 60 i + Sin 60 j ) = 9 i + 15.6 j

The sum of the two vectors is given by

u + v = 12.287 i + 8.6 j + 9 i + 15.6 j = 21.28 i + 24.2 j

Magnitude of u + v = $\sqrt{21.28^{2}+24.2^{2}}$ = 32.225

Let Ф be the angle

tan Ф = 24.2 / 21.28

Ф = 48.7 degree

5 0

3 years ago