A supply of copper pipes is stored outdoors. Over the course of many years, the copper reacts with oxygen and turns green. What clue indicates a chemical reaction took place?
Answer: the oxidation of the copper (it turning green)
Explanation:
need help asap first comment gets brainiest answer
a 100 gram sample of iron ore was found to contain 44g of iron. How many grams of iron are in a 450 gram sample of the ore?
Answer:
There are 198 grams of iron in a 450-gram sample of the ore.
Explanation:
From the given information:
Given that:
100-gram sample of iron ore is found in 44g of iron.
Thus. the grams of iron that can be found in a 450-gram sample of the iron ore can be computed as follows:
100g of iron ore = 44g of iron
450 gram of iron ore = x g of iron
x(g) of iron = ( 44g of iron × 450 gram of iron ore) / 100g of iron ore
x(g) of iron = 198 grams of iron
Thus, there are 198 grams of iron in a 450-gram sample of the ore.
Calculate the energy of a photon with a frequency of 2.36 x 10-19 Hz.
Answer:
Explanation:
energy for photon is calculated in same wasy as for electromagnetic radiation
energy for electromagnetic radiation = hf
where f is the frequency of photon
h is Planck's constant = h = 4.14 × 10−15 eV · s.
thus
energy of photon = 4.14 × 10−15 eV · s * 2.36 x 10-19 Hz
energy of photon = 9.77 * 10−(-15+ -19) eV
energy of photon = 9.77 * 10−34eV answer
Plz help! :) :D I will mark you as BRAINLIEST for the best answer!!! ( I actually mean it)
Physical and Chemical Properties of Magnesium
Here is an EXAMPLE of how it has to be like. Instead of Mercury, you HAVE to do Magnesium
Physical Properties of Mercury: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Mercury: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
convert the following
Help plz (will mark brainleist)
Answer:
energy disturbance easy
What does the (II) mean in the name Nickel(II) Chloride?
Answer:
A compound of nickel and chloride in which the ratio of nickel (in the +2 oxidation state) to chloride is 1:2. Stars
Explanation:
For lunch you have a glass of sweetened ice tea. The glass contains crushed tea leaves, sugar, a slice of lemon, and both liquid and frozen water (ice cubes). Which of the following categories of matter best describes the contents of the glass? *
Answer:
I think solids
Explanation:
sorry if its not right
filtering air to remove dust and pollen is it chemical or physical change
Answer:
Physical Change
Explanation:
Because the filter is removeing the dust by having the air go though a thin material.
Hope it helps!
Hydrogen can be found in many things. It cannot be broken down to create something else. An example of something like hydrogen is oxygen. We call things like hydrogen or oxygen _ .
Answer:
matter im pretty sure sorry if its wrong
Explanation:
based on the property of conserving matter, matter can not be created or destroyed
what is an atoms nucleus made of
Answer:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.
what is your impression of nuclear power
5. The prefox Semi-Deans Capardy SC Based on your knowledge of the properties of elements, which kind of elements is most likely to make semiconductors?
1. Compare the masses and the charges for the three particles which make
up
the atom.
Answer:
The charge on a neutron=1+-/neutral
It has a mass 1
The charge on electron is 1-/negative
It's mass is 1/1840
The charge on a proton is 1+
It has a mass 1 too.
Explanation:
Show with dot and cross diagram of the formation of ions in the reaction of Fluorine with sodium ions.
Answer:
Electron dot diagram is attached below
Explanation:
Sodium is alkali metal and present in group one. It has one valence electron. All alkali metal form salt when react with halogens.
Sodium loses its one electron to get stable. While all halogens have seven valence electrons they need only one electron to get stable electronic configuration.
When alkali metals such as sodium react with halogen fluorine it loses its one valence electron which is accepted by fluorine and ionic bond is formed. The compound formed is called sodium fluoride.
Na + F → NaF
In cross and dot diagram electrons of one atom are shown as dots while other atom shown as cross to distinguish.
Electron dot diagram is attached below.
are books on a table transparent ir opaque
Answer:
no
hope this helps
:)
Explanation:
Explain why the several different types of microscopes are all necessary.
Answer:
some zoom in farther
Explanation:
some microscopes zoom in farther than others so we can see even smaller things
Which concept guided Mendeleev’s organization of the periodic table?
In a chemical reaction, atoms are not created nor destroyed.
All matter is composed of atoms.
Matter can be classified as a pure substance or mixture.
Properties of elements repeat in predictable patterns
Answer:
Properties of elements repeat in predictable patterns.
Plz Help!
Make a funny sentence for flammability and compounds for Magnesium
Last 2 pages out of 4 please help me with the others if you can't help me with this one.
Soil is an important resource. The erosion of soil is a problem worldwide. Which human activity MOST directly increases soil erosion?
Group of answer choices
Answer:
Farming/agriculture
Hope this helps and have a great day :)
And please mark me brainliest if you can :)
What is the volume, in liters, of 1.40 mol of oxygen gas at 20.0°C and 0.974 atm?
Answer:
V = 34.55 L
Explanation:
Given that,
No of moles, n = 1.4
Temperature, T = 20°C = 20 + 273 = 293 K
Pressure, P = 0.974 atm
We need to find the volume of the gas. It can be calculated using Ideal gas equation which is :
PV=nRT
R is gas constant, [tex]R=0.08206\ L-atm/mol-K[/tex]
Finding for V,
[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{1.4\times 0.08206\times 293}{0.974 }\\\\V=34.55\ L[/tex]
So, the volume of the gas is 34.55 L.
Two reasons photosynthesis is important
Answer:
Gives us oxygen to live, and if produces products such as, rubber, timber, herbs, and medicines.
What phenomenon does the Coriolis effect arise from?
Answer:
because our planet is spinning
which means the objects near the equator are moving at much faster velocities than objects at higher latitudes
I hope this helps✌
#7- pls help me ill mark you brainliest and ill give you 5 stars <3
Answer:
I think it is synthesis
Answer:
The answer is Synthesis
Explanation:
The two objects combine to make a bigger object
Determine the number of moles of 35.4 grams of Magnesium.
Answer:
1.46 moles
Explanation:
You need to multiply 35.4g by Magnesium's molar mass.
Molar mass =1 mole/24.305g
(35.4g)(1 mole Mg/24.305g)= 1.46 moles <- rounded to 3 significant figures
As you can see, grams cancel out and you're left with moles.
Be sure to answer all parts. Given that an E2 reaction proceeds with anti periplanar stereochemistry, draw the products of each elimination. The alkyl halides in (a) and (b) are diastereomers of each other. How are the products of these two reactions related? When drawing alkene substituents, remember that it is preferable to draw them as regular lines than as dashes and wedges. a. untitled draw structure ...
Answer:
hello your question is incomplete attached below is the complete question and answer
answer: attached below
Explanation:
A) attached below
B) attached below
Please answer correctly..
will give the brainliest!
Urgent!!!
a) lithium
Execution:
First, a magnesia stick is dipped in hydrochloric acid and then in lithium chloride. The stick is then held in the burner flame.
Observation:
The flame turns carmine.
b) ammonium ion
Execution:
Some ammonium sulfate is placed in a small vessel. A strip of indicator paper is moistened and stuck to the inside of a watch glass case. Then a few drops of hydrochloric acid are added to the ammonium sulfate and the watch glass bowl is held over the vapors that develop.
Observation:
The indicator paper turns blue because gaseous ammonia is produced, which reacts with the water in the indicator paper to form a base.
c) sulfate ions
Execution:
The ammonium sulfate is dissolved in water and treated with barium chloride solution.
Observation:
A white, poorly soluble precipitate of barium sulfate is formed.
d) presence of water
Execution:
Anhydrous copper sulfate, which is white, is added to the substance to be tested.
Observation:
In the presence of water, the salt turns light blue.
e) carbonate ions
Execution:
A few drops of hydrochloric acid are placed on the solid calcium carbonate.
Observation:
A gas evolution can be observed, during which carbon dioxide is produced.
f) iodide ions
Execution:
A potassium iodide solution is mixed with silver nitrate solution.
Observation:
A yellow precipitate of silver iodide is formed.
Which of the following elements has the largest electronegativity? A) Bismuth B) Nitrogen C) Potassium D) Arsenic