Answer:
- Hardness
Hardness is a mineral’s ability to resist being scratched. Minerals that are not easily scratched are hard. You test the hardness of a mineral by scratching its surface with a mineral of a known hardness. Mineralogists use the Mohs Hardness Scale, shown in Table below, as a reference for mineral hardness. The scale lists common minerals in order of their relative hardness. You can use the minerals in the scale to test the hardness of an unknown mineral.
Mohs Hardness Scale
As you can see, diamond is a 10 on the Mohs Hardness Scale. Diamond is the hardest mineral; no other mineral can scratch a diamond. Quartz is a 7. It can be scratched by topaz, corundum, and diamond. Quartz will scratch minerals that have a lower number on the scale. Fluorite is one. Suppose you had a piece of pure gold. You find that calcite scratches the gold. Gypsum does not. Gypsum has a hardness of 2 and calcite is a 3. That means the hardness of gold is between gypsum and calcite. So the hardness of gold is about 2.5 on the scale. A hardness of 2.5 means that gold is a relatively soft mineral. It is only about as hard as your fingernail.
Mohs Scale
Hardness Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase feldspar
7 Quartz
8 Topaz
9 Corundum
10 Diamond
sorry im so late -_-ll
You notice that heat is released during a chemical reaction. This reaction is a(n) _______ reaction.
you see a coin at the bottom of a fountain of water but when you reach for it it is in another place than it appears to be
A molecule contains 24.36g of N and 62.64 g of Ag. What is its empirical formula
Answer:
AgN3
Explanation:
How many moles of Ca(OH)2 are in 3.5kg of Ca(OH)2? Answer in units of mole
Answer:
47.3 moles of [tex]Ca(OH)_2[/tex] are in 3.5 kilograms of [tex]Ca(OH)_2[/tex].
Explanation:
[tex]n=\frac{m}{M}[/tex]
Where:
n = Moles of the compound
m= Given mass of the compound
M = Molar mass of the compound
Mass of the calcium hydroxide, m = 3.5 kg = 3500 g (1kg = 1000 g)
Molar mass of the calcium hydroxide = M = 74 g/mol
Moles of calcium hydroxide = n
[tex]n=\frac{3500 g}{74 g/mol}=47.297 mol\approx 47.3 mol[/tex]
47.3 moles of [tex]Ca(OH)_2[/tex] are in 3.5 kilograms of [tex]Ca(OH)_2[/tex].
What unit of time on Earth is based on the rotation of the Earth? A. month B. day C. year D. hour
Will mark as Brainliest.
Two hundred grams of a substance requires 0.52 kJ of heat to raise its temperature from 25°C to 45°C. Use the table to identify the substance. q = mC▲T. Mass (m) is in grams. Temperature is in degrees Celsius.
Substance: Specific Heat (C) in joules per gram/degrees centigrade:
Water (ice) 2.05
Iron 0.46
Aluminium 0.90
Gold 0.13
Copper 0.39
Ammonia (liquid) 4.70
Ethanol 2.44
Gasoline 2.22
Water (liquid) 4.18
Water (vapor) 2.08
Air (25 degrees Celsius) 1.01
Oxygen 0.92
Hydrogen 14.30
Question options:
water
gasoline
ammonia
gold
Answer:gold
Explanation:
is the equation 2C2H2+5O2=4CO2+2H20 A BALANCED EQUATION
Why is it not a good idea to use a stopper when combining two unknown substances in test?
Which statement describes the valence electrons in metallic bonds?
Answer:
They are shared among many atoms.
Explanation:
In metallic bonds, the valence electrons of interacting metal atoms from s and p orbitals are delocalized. Therefore, instead of revolving their respective metal atoms they form a sea of electrons.
Therefore, the positively charged atomic nuclei of the interacting metal ions gets surrounded by this sea of electrons.
Hence, we can conclude that the valence electrons in metallic bonds are shared among many atoms.
Final answer:
Valence electrons in metallic bonds are delocalized, allowing them to move freely and contribute to properties like conductivity and malleability. The metallic bond consists of the attraction between cations and a 'sea of electrons,' resulting in varying strengths and melting points for different metals.
Explanation:
The valence electrons in metallic bonds are delocalized, which means that they do not belong to any one atom but are free to move about the entire metal structure. The metallic bond is characterized by an electrostatic attraction between the positively charged nuclei, known as cations, and these free-moving, or delocalized, valence electrons. This forms a 'sea of electrons' that is responsible for many properties of metals such as conductivity, malleability, and ductility.
In solid metals, these valence electrons can move relatively easily throughout the crystalline lattice, forming an attraction with positive ions. The strength of these bonds varies, but typically metallic bonds are weaker than ionic or covalent bonds, with dissociation energies ranging from 1 to 3 eV. Some metals have very high melting points and are hard, while others are softer and have lower melting points, primarily depending on the number of delocalized electrons.
How does the potential energy of an object change as its distance from the ground changes?
How many atoms are in 5.03 moles of silicon dioxide
Which of the following elements is the most reactive?
Chlorine
Bromine
Fluorine
Helium
Answer:
Fluorine is the most reactive element in this list
Explanation:
2. What charge does an electron have? a. Positive b. Negative c. Neutral d. No charge
Why do submarines have to be built with such strong, thick walls, compared to ships? Explain in as much detail as you can using ideas about water pressure.
If a light bulb is missing or Broken in a parallel circuit,will the other bulb light
A 1.0 mole sample of HNO3 is added to water. The final volume of the solution is 1.5 L. Calculate the pH of the Solution
The pH of the solution is 1.12.
HNO₃ is a strong acid, which means it completely dissociates in water to form H⁺ and NO₃- ions.
The number of moles of HNO₃ added is 1.0 mole.
The final volume of the solution is 1.5 L, so the concentration of HNO₃ can be calculated as:
[HNO₃] = number of moles / volume (in liters) = 1.0 mole / 1.5 L = 0.67 M
Since HNO₃ is a strong acid, it completely dissociates to form H+ ions. Therefore, the concentration of H⁺ ions is equal to the concentration of HNO₃:
[H⁺] = [HNO₃] = 0.67 M
Now, we can calculate the pH using the following equation:
pH = -log[H⁺] = -log(0.67) = 1.12
Therefore, the pH of the solution is 1.12.
The force produced by the pull of the earth's gravity on an object is called what?
yeah weight is the answer
PLEASE HELP ME!?!?! What technology did scientists use in the mid-1900s to map the mid-ocean ridge
The force that slows down and eventually stops a ball you roll across the pavement is called A) kinetic force. B) friction force. C) the slow force. D) potential force.
The ball stops moving because of friction force. Friction is the force that opposes all motion. Therefore, the answer is friction force...
Answer:
friction
Explanation:
took test
During a phase change the temperature of a substance
Answer:
remains constant
Which is the largest atom? A. Bromine (Br) B. Chlorine (Cl) C. Iodine (I) D. Fluorine (F)
If 1.98 moles of C are reacted with an excess of Cu2O how many moles of CO would be produced? moles
Using the balanced chemical equation 2C + Cu2O → 2CO + 2Cu, it can be determined that 1.98 moles of carbon will produce 1.98 moles of carbon monoxide (CO) when reacting with an excess of copper(I) oxide.
Explanation:The subject of this question is Chemistry, specifically dealing with stoichiometry which involves the calculation of the amounts of reactants and products in chemical reactions. Given that 1.98 moles of carbon (C) react with an excess of copper(I) oxide (Cu2O), we need to know the balanced chemical equation to find the amount of carbon monoxide (CO) produced.
The chemical equation for the reaction between carbon and copper(I) oxide to produce carbon monoxide and copper would be:
2C + Cu2O → 2CO + 2Cu
From this balanced equation, we can see that 2 moles of carbon react with 1 mole of copper(I) oxide to produce 2 moles of carbon monoxide. Therefore, if we start with 1.98 moles of carbon, we will also produce 1.98 moles of CO, since the ratio of carbon to carbon monoxide is 1:1.
When 1.98 moles of C are reacted with an excess of Cu2O, it would produce 1.98 moles of CO assuming the reaction follows the stoichiometry of 2 moles of C producing 2 moles of CO.
Explanation:If 1.98 moles of C are reacted with an excess of Cu2O, the number of moles of CO produced can be determined by using stoichiometry and the balanced chemical equation for the reaction. Unfortunately, the actual balanced chemical equation is not provided in the question. However, a typical reaction between carbon and copper (I) oxide might look like this:
2C(s) + Cu2O(s) → 2CO(g) + Cu(s)
According to this balanced equation, 2 moles of carbon react with 1 mole of copper(I) oxide to produce 2 moles of carbon monoxide. Therefore, if we have 1.98 moles of carbon, it would produce 1.98 moles of CO, assuming carbon is the limiting reactant and since there's an excess of Cu2O.
which two factors determine sound intensity
Factors that determine
sound intensity are amplitude and the distance.
Amplitude
Amplitude depends on the starting energy of the sound wave. If the amplitude is high
then the intensity will be high.
Distance
Distance is the measure of how far does the sound wave travel
from its source. If the distance is high then the intensity will be low.
which of the following is not an example of a music parameter
Answer:
Fragmentation
Explanation:
APEX
Planetesimal definition
Classify these elements by whether they get oxidized or reduced in the reactions shown here: 2Ca(s)+ O 2 (g) F 2 (g)+2Li(s) → → 2CaO(s) 2LiF(s
Calcium and lithium are oxidized and Florine and oxygen are reduced.
What are oxidizing agent?Oxidizing agent are defined as a substance or component that participates in an oxidation-reduction reaction and receives electrons from a separate species. The oxidizing agent, often referred to as the electron acceptor, is typically in one of its higher oxidation states since it will receive electrons and be reduced.
Reducing agent are defined as a reactant in an oxidation-reduction reaction that decreases another reactant by discharging electrons to that reactant. Reducing one's consumption of energy-dense foods and canceling undesired magazine subscriptions are two examples. Another example of reduction is to turn off the water when brushing your teeth rather than letting it run the full two minutes.
Thus, calcium and lithium are oxidized and Florine and oxygen are reduced.
To learn more about oxidizing agent, refer to the link below:
https://brainly.com/question/10547418
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What was the hiker's average velocity during part B of the hike? In Part A, a hiker travels four kilometers east from nine to nine-forty-five a.m. In Part B, a hiker travels six kilometers south from nine-forty-five to ten-forty-five a.m. In Part C, a hiker travels four kilometers west from ten-forty-five to eleven-fifteen a.m. In Part D, a hiker travels six kilometers north from eleven-fifteen a.m. to twelve p.m.
You have this in Chemistry. It should be in physics, but never mind that.
A
d = 4 km due east. See note for part B.
t = 45 minutes = 3/4 hour
v = ??
d = v * t
4 = v * (3/4)
v = 4/(3/4) = 4 * 4/3 = 16/3 = 5 1/3
So his rate of travel is 5 1/3 km/hr due east. If you do not give the direction when it says velocity, you are wrong. Velocity has direction.
B
10 45 to 11 45 is 1 hour.
d = v * t
d = 6 km due south (this is actually a displacement which also has direction).
t = 1 hour
6 = v * (1)
6/(1) = v
6/(1) = v
v = 1 km/ hr due south
What has cells that are dried out?
1.the water on the surface of the earth
2. a solution that will conduct an electric current
3. process used by plants to make simple sugars and starches
4. process used to produce fresh water from saline
photosynthesis
desalination
hydropshere
electrolyte
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HELP ASAP!!!!!!!!!!!!!!!!!!!!
The temperature of an object is directly related to A. the volume of the object. B. the motion of its particles. C. the potential energy of its chemical bonds. D. the mass of the object.
Answer: Option (B) is the correct answer.
Explanation:
In a solid object, molecules are closely packed together due to strong intermolecular forces between them. So, when heat is provided to the object then forces between the atoms decreases and as a result, atoms start to move from their initial place.
Hence, atoms gain kinetic energy due to increase in their motion.
For example, when ice is heated it changes into liquid state of water.
Also, K.E = [tex]\frac{3}{2}kT[/tex]
where k = Boltzmann constant
T = temperature
Hence, kinetic energy is directly proportional to temperature.
Thus, we can conclude that the temperature of an object is directly related to the motion of its particles.