The mineral hardness depends on its resistance to being scratched. Mohs scale is used to determine the hardness of an unknown mineral. The unknown mineral is harder than Orthoclase, but not harder than Quartz.
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The hardness of a mineral is its resistance to being scratched or marked on the surface by another material.
Several elements are used to test the hardness of a mineral, like another mineral of known hardness.
Many different scales can be used to identify the mineral. However, the most commonly used is the Mohs scale.
Let us say that you have two minerals. You already know which mineral is one of them and its hardness.
If the unknown mineral scratches the known mineral, means that the first one is harder than the second one.But if the unknown mineral does not get to scratch the known one, it means they are equally hard, or the known mineral is harder than the unknown one.In the exposed example, the table must be as follows
Mineral Was a scratch produced?
Chalcopyrite YES
pyrite YES
Orthoclase YES
Quartz NO
Quartz is the hardest of these minerals. Its hardness level is 7 according to the Mohs scale.
Because scratches were produced using Chalcopyrite, Pyrite, and Orthoclase, we can assume that the unknown mineral is harder than these three ones.
However, no scratch was produced using quartz, suggesting that the unknown mineral is between orthoclase and quartz in the Mohs scale.
The unknown mineral is harder than Orthoclase, but not harder than Quartz. It is between 6 and 7 hardness levels.
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You can learn more about the Mohs scale at
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Answer:
I can conclude that the mineral that the scientist found is harder than chalcopyrite, pyrite, and orthoclase, but not harder than quartz. I can also conclude that the unknown mineral is a relatively hard mineral.
Explanation:
edge example 2023
H2O decomposes to hydrogen and oxygen as describe in the
following reaction:
2H20 (1) ► 2H2 (9) + O2 (9)
What is the mole fraction of hydrogen gas in the products?
a 0.5
b 0.33
C 0.4
d 0.67
When magnesium ium is left in moist air for several hours, the metal Sur face taanishes?why
Answer:
due to the formation of an oxide or hydroxide layer
Explanation:
magnesium is a reactive metal...when left in air it reacts with oxygen to form an oxide layer of MgO and it can react with moisture to form Mg(OH)2 LAYER ON THE SURFACE.
Of the elements listed, circle the one that will form the LARGEST ion:
Br, Zn, Ni, Cu, Fe, Mn
A compound contains 40%carbon, 6.7%hydrogen, and 56.3%oxygen
calculate the molecular formula of the compound, if it’s vapour density is 90. Note that molecular
mass=2 x vapeur density
What is the formula for atomic weight amu of neon
Answer:
abundance of the first isotope times the Mass of the first isotope
What does a chemical equation show that a word equation does not
Answer: I do believe it shows variables.
Explanation:
1. Predict the shape of the graph for a y versus x plot of air pressure versus altitude.
How does temperature affect winds all
over the globe?
Answer:
The differences in atmospheric pressure generate winds.
Explanation:
At the Equator, the sun warms the water and land more than it does the rest of the world. Warm equatorial air rises higher into the atmospher and migrates towards the poles. The complex relationships between fronts cause different types of winds and weather patterns.
I hope this helps :)
I need answer for a. (ii) pls
Answer:
Stopwatch
Stopwatch is a time measuring tool.
Use the Periodic Table to find molar mass of water. Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to form sodium chloride (NaCl) and water according to the equation: NaOH HCl → NaCl H2O What mass of water forms when 2. 75 Ă— 10â€""4 mol NaOH reacts completely? 2. 75 Ă— 10â€""4 mol NaOH = g H2O.
Considering the reaction stoichiometry, 0.00495 grams of water is produced when 2.75×10⁻⁴ moles of NaOH reacts completely.
Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to form sodium chloride (NaCl) and water. So, the balanced reaction is:
NaOH + HCl → NaCl + H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
NaOH: 1 moleHCl: 1 moleNaCl: 1 moleH₂O: 1 mole
In the periodic table, you can find the molar mass of the elements, also called atomic mass or atomic weight. So, to calculate the molar mass of a compound, you must add the molar mass of the elements of the compound multiplied by the times they appear in the compound.
So, in the case of water:
H₂O= 2× 1 g/mole + 16 g/mole
H₂O= 18 g/mole
Then, if by stoichiometry of the reaction 1 mole of water is produced, the mass of water produced is calculated as:
mass H₂O= 1 mole× 18 g/mole
mass H₂O= 18 g
Then you can apply the following rule of three: if by stoichiometry 1 moles of NaOH produce 18 grams of H₂O, 2.75×10⁻⁴ moles of NaOH will produce how much mass of H₂O?
[tex]mass of H_{2} O=\frac{2.75x10^{-4} moles of NaOHx18 grams of H_{2} O}{1 mole of NaOH}[/tex]
mass of H₂O= 0.00495 grams
In summary, 0.00495 grams of water is produced when 2.75×10⁻⁴ moles of NaOH reacts completely.
Learn more about stoichiometry:
brainly.com/question/16487206?referrer=searchResults brainly.com/question/14446695?referrer=searchResults brainly.com/question/11564309?referrer=searchResults brainly.com/question/4025026?referrer=searchResults brainly.com/question/18650135?referrer=searchResultsElement of group 2 loses two electrons in the process of a chemical combustion. what is the ionic charge? +2 or -2
the valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emiting the excess energy as light which property of metals is explained by this?
Answer:
Lustrous
Explanation:
Metals are lustrous which gives them a property of having Shiny surfaces
The valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous property of metals.
What are valence electrons?Valence electrons are defined as a negatively charged particle that can be shared or transmitted between atoms that is found in the outermost shell of an atom. Valence electrons have a crucial role in determining how an atom will behave. The electrical configurations of elements can be used to find valence electrons. The total number of valence electrons in that element is then determined by counting the number of electrons in the outermost shell.
When newly treated, polished, or broken, a material takes on a bright look and conducts electricity and heat reasonably well. Metals are typically ductile and malleable. These traits are the result of the metallic bond that connects the atoms or molecules of the metal.
Thus, the valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous property of metals.
To learn more about valence electrons, refer to the link below:
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15. Which reaction produces a coloured substance?
A. The addition of sodium metal to water.
B. The addition of sulfur dioxide gas to water.
C. Burning sodium metal in chlorine gas.
D. The addition of chlorine gas to a solution of potassium iodide.
Answer:
the addition of chlorine gas to a solution of potassium iodide.
The reaction that produces a colored substance is the addition of chlorine gas to a solution of potassium iodide. The correct option is D.
What is a chemical reaction?In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, when humans breathe in oxygen, it combines with glucose to create carbon dioxide, water, and energy.
Another sign that a chemical reaction has taken place is a change in color. If two solutions are combined and a color change occurs that is not just the effect of diluting one of the reactant solutions, a reaction has taken place. A solid and a liquid combined may also result in a change in color.
Therefore, the correct option is D. The addition of chlorine gas to a solution of potassium iodide.
To learn more about chemical reactions, refer to the link:
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why does fluorine have the highest electronegativity
Answer:
Because it only needs one more electron to get to a full valence shell (8), so it really wants it and is pulling other electrons in. It also has to do with needing one more electron to fill the 2p shell. It is a small element which means its electrons are pulled tightly to the nucleus.
Hope this helps!
Explanation:
What is the minimum uncertainty in a simultaneous measurement of the y-component of the proton's velocity?.
Answer: c
Explanation:
Which of the following is unlikely to form a compound?
a. S
b. H
c. K
d. Ar
d. Si
Answer:
I think the answer is Ar, k or just k. Can you pick two answers?
Explanation:
I hope this helps.
P.S. you put two d's
which aqueous solution has the lowest vapor pressure?
Answer:
Since all of them are aqueous solutions, the solvent in each solution is H2O. Based on the Raoult's Law, we only have to determine which solution contains the highest mole fraction of the solvent, H2O. The solution that will have the lowest vapor pressure is a. 0.20 m Na2SO4.
Explanation:
plz give brainliest
Write word equations for the reactions of a) magnesium with chlorine b) potassium with oxygen c) sodium with bromine d) carbon with oxygen.
what is an example of force pair
he interaction between a baseball bat and a baseball
How many elements are present in the compound Na_2S_2O_3
Answer:
3 elements are present in thr compound
what is an atom plz answer to get 10 points +brainliest
If a number has the units g/L then its
A) a number we are not going to use at all.
B) an imaginary unit that we are not going to use.
C) creating a relationship between mass and volume
D) a relationship between volume and distance.
Answer:
C) creating a relationship between mass and volume
g/L
g or gram is mass
L or Litres is for volume
what is the chemistry between us?
What is the main cause of global convection currents?
A. Deforestation
B. The Greenhouse effect
C. The increase in the number of cities
D. Uneven heating of the Earth by the sun
Answer: The answer is D, uneven heating of the Earth by the Sun.
Match each term in the first column with an example in the second column. On a sheet of paper, write the letter of the answer.
1. physical property
2. chemical property
3. solid.
4. liquid
5. physical change
6. chemical change
———————————————
A. ability to burn
B. rust appears on a nail
C. a puddle freezes
D. substance that has a definite shape and volume
E. temperature or destiny
F. substance that has a definite volume, but no definite shape
Answer:
4 = f
3 = d
5 = c
6 = b
2 = a
1 = e
Explanation:
why does adding lemon juice to blueberry smoothie make it change colour from purple to pink
Why is there a large difference between day and night temperatures in a desert?
All rainfall in a desert happens at night.
There are no plants to trap the heat.
Heat escapes rapidly at night because the air is so dry.
The ground absorbs all heat. 20 points :,)
Answer: Heat escapes rapidly at night because the air is so dry.
Explanation: The desert has little humidity and rarely is cloudy. These two factors allow the desert to heat up rapidly during the day and cool off quickly at night.
PLEASSE HELP gotta get the answers neowww, basically just match the letters with the things.
Answer:
North pole-A
South pole- F
Equator- E
Polar Easterlies-C
Prevailing Westerlies-D or B-not sure
Trade Winds-D or B-not sure
An aqueous solution has a volume of 2.0 L and contains 36.0g of glucose. If the Molar Mass of glucose is 180g/mol, what is the molarity of the solution
Convert grams of Glucose to moles of Glucose and then solve for Molarity
show all work.
Answer:
moles = 36/180 = 0.2 moles
molarity = 0.2/2 = 0.1 mol/dm3
what type of elements form ionic bonds with metals
Answer:
between metal and nonmetal ions
Explanation: