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3 years ago

I’ll give you a lot of points and mark you brainlist if you awnse all 3

Chemistry

2 answers:

miskamm [114]3 years ago

8 0

Answer:

Magma,

Volcanic Glass,

Granite and Pumice,

Lava

Explanation:

suter [353]3 years ago

7 0

Answer:

Magma

Volcanic glass

Granite and pumice

Explanation:

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Which species can conduct an electric current?

weeeeeb [17]

Answer:

H2O(s)

Explanation:

because it is a solid and an aqueous can not conduct electricity

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3 years ago

One of the emission lines that provides the green color in fireworks, which com s from barium salts, has a wavelength of 505nm.

PSYCHO15rus [73]

Explanation:

(a)

The relation between frequency and wavelength is shown below as:

$c=frequency\times Wavelength
$

c is the speed of light having value $3\times 10^8\ m/s$

Given, Wavelength = 505 nm

Also, 1 m = $10^{-9}$ nm

So,

Wavelength = $505\times 10^{-9}$ m

Thus, Frequency is:

$Frequency=\frac{c}{Wavelength}$

$Frequency=\frac{3\times 10^8}{505\times 10^{-9}}\ Hz$

$Frequency=5.94\times 10^{14}\ Hz$

(b)

Also, $E=\frac {h\times c}{\lambda}$

Where,

h is Plank's constant having value $6.626\times 10^{-34}\ Js$

c is the speed of light having value $3\times 10^8\ m/s$

So,

$E=\frac{6.626\times 10^{-34}\times 3\times 10^8}{505\times 10^{-9}}\ J$

$E=\frac{10^{-26}\times \:19.878}{10^{-9}\times \:505}\ J$

$E=3.94\times 10^{-19}\ J$

(c)

Electromagnetic spectrum is range of the frequencies and their respective wavelengths of the various type of the electromagnetic radiation.

In order of the increasing frequency and the photon energy and the decreasing wavelength the spectrum are:

Red , Orange, Yellow, Green, Blue, Indigo, Violet

Increasing wavelength is the opposite trend. Thus, The longest visible wavelength is red and the shortest is violet.

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3 years ago

How many moles are 7 grams of calcium oxide? (Atomic mass of Calcium - 40 u, oxygen-16 u)

White raven [17]

Answer:

0.125

Explanation:

no of moles = given mass / molar mass

no of moles = 7/

molar mass of calcium oxide = atomic mass of calcium + oxygen

molar mass = 40 + 16

molar mass = 56

no of moles = 7/ 56 = 1/8 = 0.125

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3 years ago

The digestion of food in the body is an example of ____________ reaction

Anit [1.1K]

Answer:

A Chemical Reaction

Explanation:

There are 2 kinds of reactions physical and chemical. The digestion process often involves the use of digestive enzymes in your mouth and acid in your stomach.

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4 years ago

The table above shows data collected on five apples while doing field research outside the laboratory. What type of lab equipmen

nalin [4]

D a gram scale would measure grams

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4 years ago

Read 2 more answers