Which of the following is a mineral?
coal
ling
glass
brick
salt
Answers
Related Questions
Which of these statements best describes how scientific ideas change? a. New evidence leads to the modification of ideas. b. As a scientific idea changes, it eventually becomes a scientific theory and, ultimately, a law. c. Scientific ideas rarely change because they are based on extensive evidence. d. Scientists form opinions based on evidence and decide how the idea should change.
Answers
Answer: I think is A
Explanation:
For example, the scientific community used to believe that we lived in a geocentric solar system when in reality, we live in a heliocentric solar system. This idea was proved over time due to famous scientists such as Galileo Galilei, Nicolaus Copernicus, and James Bradley over a course of many years and as such, ideas changed with new scientific evidence.
Convert 3.5mol of CO2 to grams.
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a metal is added to a liquid and bubbles form. what might be concluded?
Answers
If a metal is added to a liquid and bubbles form, it can be concluded that a chemical reaction is occurring between the metal and the liquid, and that a gas is being produced.
The formation of bubbles indicates the evolution of a gas, and the metal is most likely reacting with an acid in the liquid to produce hydrogen gas. Metals like magnesium, zinc, and aluminum react with acids to produce hydrogen gas, which is typically observed as bubbles. The chemical reaction that occurs is an example of a single displacement reaction, in which the more reactive metal (the metal added to the liquid) replaces the less reactive hydrogen ion in the acid to form a metal salt and hydrogen gas.
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Why is carbon-14 used for carbon dating?
A. Carbon-14 is formed from cosmic rays containing neutrons so it is easy to determine which carbon is natural to Earth and which is carbon-14.
OB. It is the only radioactive element not harmful to living organisms.
OC. Carbon-14 has a half-life of millions of years so it can date extremely old remains.
D. The proportion of carbon-14 in living organisms stays constant until they die and then it begins decreasing allowing scientists to calculate approximate time of death.
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3. Which best explains the flow of energy in an internal combustion engine?
O
A. Work is converted into energy stored in chemical bonds.
B. The expansion of gases is used to do work.
C. Heat is converted into work to power the engine.
D. An increase in pressure is converted into heat and work.
Check Answer
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An increase in pressure is converted into heat and work, explains the flow of energy in an internal combustion engine. Gasoline is ignited and consumed within an internal combustion engine (ICE) by the engine itself.
The engine then partially transforms the energy from combustion into work. The engine is composed of a fixed cylinder and a rotating piston. There are three main types of internal combustion engines in use today: the spark ignition engine, which is mainly used in automobiles; the diesel engine, which is used in heavy machinery and industrial systems and has an advantage over the more compact and lighter ones due to improvements in cycle efficiency.
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What system was put into place in 1965 to help people be prepared for future tornados? WILL GIVE BRAINLIEST AND THANKS
Question 2 options:
NOAA
SKYWARN
SKYWATCH
Answers
Answer:
Eas and NOAA is that system
equation
4 is number 4
#13 Using equation 4, calculate the buffer capacity of water = M per unit pH change Answer format: Number: Round to: 4 decimal places. Show Hint √0 % #14 Please show your work for this answer using
Answers
Equation 4 is given as:pH = pKa + log ([A-]/[HA])Where pH is the negative log of the hydrogen ion concentration and pKa is the negative log of the acid dissociation constant. [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.
Using equation 4, the buffer capacity of water can be calculated using the following formula:
β = dC/dpH
where β is the buffer capacity, dC is the change in concentration of the acid or the base, and dpH is the change in pH per unit concentration.
To calculate the buffer capacity of water, we need to know the acid dissociation constant (Ka) of water. The Ka of water is 1.0 x 10-14 M at 25°C.
Therefore, the pKa of water is 14.0 at 25°C.We can assume that the concentration of water is constant, so the change in concentration of water (dC) is zero. Therefore,β = dC/dpH = 0/dpH = 0The buffer capacity of water is zero because water cannot act as a buffer since it is a neutral substance with no acid or base properties.Showing the work for Answer 14:β = dC/dpHwhere dC = 0 (since the concentration of water is constant) and dpH = 1Therefore,β = 0/1 = 0M/pHThe buffer capacity of water is zero M/pH.
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what are the typical properties of a group 1 metal
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Answer:
The group 1 elements are all soft, reactive metals with low melting points. They react with water to produce an alkaline metal hydroxide solution and hydrogen.
Explanation:
Suppose that 5-ml containers of helium (He), neon (Ne), and argon (Ar) are at pressures of 1 atm,
2 atm, and 3 atm, respectively. The He and Ne are then added to the container of Ar.
a. What is the partial pressure of He in the container after the three gases are mixed?
b. What is the total pressure in the container after the three gases are mixed?
Answers
The total pressure in the container after the three gases are mixed is 6 atm and the partial pressure of He is 1 atm.
What is Dalton's Law of Partial Pressure ?According to Dalton's Law of Partial Pressure , the pressure exerted by a mixture of gas is equal to the sum of the partial pressure of the gases in the mixture.
P(total) = p₁ +p₂+p₃+.....
As the volume of the containers are same and the
n = 1*5/RT for Helium
n = 2*5 /RT for Neon
n= 3*5/RT for Argon
Mole fraction = moles of the element/Total moles
Moles fraction of Helium is
\(\rm \dfrac{1*5}{1*5+2*5+3*5}\)
= 1/6
Total Pressure in the container = 1 + 2 +3 = 6 atm
The partial pressure of Helium will be
=Mole fraction * Total pressure
=(1/6)*6 atm
= 1 atm , as the volume is same the temperature is same , the pressure will also be same.
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How much energy is needed to convert 15.0 g of ice at -5.0 oC into water at 50.0 oC?
Answers
Using thermodynamics
\(\\ \sf\longmapsto Q=mc∆T\)
\(\\ \sf\longmapsto Q=0.015(328)(4184)\)
\(\\ \sf\longmapsto Q=20585.28J\)
In the tin oxide laboratory activity, what was the color of the vapor emitted when the nitric acid was added to the tin?
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In the tin oxide laboratory activity, orange-brown was the colour of the vapour emitted when the nitric acid was added to the tin.
Tin is a soft, white silvery metal. It is not easily oxidized and can resist corrosion because it is protected by the layer of oxide. Its properties are somewhat similar to lead and germanium. Nitric acid is a very strong acid and is also known as aqua fortis.
Reaction between metallic tin and concentrated nitric acid is given as follows:
Sn + 4HNO₃ → H₂SnO₃ + 4NO₂ + H₂O
When metallic tin reacts with concentrated nitric acid it forms metastannic acid, nitrogen oxide gas and water.
Reaction between very dilute nitric acid (6%) reacts with tin, the reaction is given as follows:
8Sn + 10HNO₃ → NH₄NO₃ + 8SnNO₃ + 3H₂O
When metallic tin reacts with very dilute nitric acid it forms ammonium nitrate, water and tin nitrate.
Reaction between dilute nitric acid (20%) reacts with tin, the reaction is as follows:
4Sn + 10HNO₃ → NH₄NO₃ + 4Sn(NO₃)₂ + 3H₂O
When metallic tin reacts with dilute nitric acid it forms ammonium nitrate, water and tin (II) nitrate.
Thus when tin reacts with concentrated nitric acid it forms metastannic acid.
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Solid formation begins with the weathering of ____?
Subsoil
Humus
Rock
Litter
Im giving brainliest to the correct answer
Answers
Answer:
The weathering of Rocks
Explanation:
C
How many kinds of horses are there in the world? Give me a real number, plz its for a magazine article!
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Answer:
784
Explanation:
Answer:
784 horse breeds
Part D
Explain how your model is different from the model in the picture.
Answers
Answer:
I am explain you in image
Which equations are true for x = –2 and x = 2? Select two options x2 – 4 = 0 x2 = –4 3x2 + 12 = 0 4x2 = 16 2(x – 2)2 = 0
Answers
Answer:
•4x^2 = 16
•2(x - 2)^2 = 0
Explanation:
To solve this problem, we can simply substitute x = -2 and x = 2 into each of the given equations, and see which ones are true.
Let's start with x = -2:
x^2 - 4 = 0: (-2)^2 - 4 = 0, so this equation is not true for x = -2.
x^2 = -4: (-2)^2 = 4, which is not equal to -4, so this equation is not true for x = -2.
3x^2 + 12 = 0: 3(-2)^2 + 12 = 12, which is not equal to 0, so this equation is not true for x = -2.
4x^2 = 16: 4(-2)^2 = 16, so this equation is true for x = -2.
2(x - 2)^2 = 0: 2(-2 - 2)^2 = 0, so this equation is true for x = -2.
Now let's try x = 2:
x^2 - 4 = 0: 2^2 - 4 = 0, so this equation is not true for x = 2.
x^2 = -4: 2^2 = 4, which is not equal to -4, so this equation is not true for x = 2.
3x^2 + 12 = 0: 3(2)^2 + 12 = 36, which is not equal to 0, so this equation is not true for x = 2.
4x^2 = 16: 4(2)^2 = 16, so this equation is true for x = 2.
2(x - 2)^2 = 0: 2(2 - 2)^2 = 0, so this equation is true for x = 2.
Therefore, the two equations that are true for both x = -2 and x = 2 are:
4x^2 = 16
2(x - 2)^2 = 0
In summary, by substituting x = -2 and x = 2 into each equation and checking for equality, we found the two equations that are true for both values of x.
. If you add boiling water to a cup at room temperature, what would you expect the final equilibrium temperature of the unit to be
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When you add boiling water to a cup at room temperature, you would expect the final equilibrium temperature of the unit to be somewhere between the initial temperature of the cup and the temperature of the boiling water.
The final equilibrium temperature of the unit will depend on a number of factors, including the initial temperature of the cup, the amount of boiling water added, and the rate of heat transfer between the water and the cup.
Assuming the cup is at room temperature, which is typically around 20-25 degrees Celsius, and the boiling water is at 100 degrees Celsius, the final equilibrium temperature will likely be somewhere in the range of 25-100 degrees Celsius.
This is because heat will transfer from the hotter water to the cooler cup until they reach thermal equilibrium or the same temperature. The rate of heat transfer will depend on the materials and properties of the cup and the water, as well as any other factors that may impact the process.
Factors that could impact the final equilibrium temperature include the size and shape of the cup, the type of material it is made from, the amount of boiling water added, and any insulation or other barriers that may affect the rate of heat transfer.
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confrontation, compromise, and withdrawal are all forms of ________.
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Confrontation, compromise, and withdrawal are all forms of conflict management. In conflict management, confrontation means facing up to or standing up to someone, while withdrawal means retreating from a relationship or situation when there is no possibility of conflict resolution.
Similarly, compromise is a way of resolving a conflict or disagreement by giving up something or meeting someone halfway. When a conflict arises, people use different strategies to manage it. Conflict management strategies can be classified into two broad categories; constructive conflict management and destructive conflict management. Constructive conflict management strategies are strategies used to resolve conflicts peacefully without any harm to either party. Such strategies include confrontation, compromise, problem-solving, negotiation, and collaboration. Conversely, destructive conflict management strategies are those that are aimed at causing harm, such as physical violence, emotional abuse, or verbal attacks.
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What does the answer of element 3Na2S2O3?
Answers
Answer:
Explanation:
3× 22+2×32+ 6×16=
66+64+96=236
ASAP please and Thankyou
Answers
WILL GIVE BRAINLIEST!! PLS HELP!!!
Answers
Answer:
Thermal energy is the sum of the kinetic and potential energy of all the atoms in an object or substance.
(This statement is true for ideal gases, but for solids and liquids, thermal energy also includes the energy associated with intermolecular forces.)
Question 1 What is the volume of 12.5 moles of H_(2) at STP conditions?
Answers
The volume of 12.5 moles of H2 at STP conditions is approximately 273 L.To calculate the volume of 12.5 moles of H2 at STP conditions, we need to use the Ideal Gas Law. The Ideal Gas Law states that:
PV = nRT
where
P = pressure
V = volume (unknown)
n = moles
R = ideal gas constant
T = temperature (273 K for STP conditions) Rearranging the Ideal Gas Law equation to solve for volume, we get:
V = nRT/P
Plugging in the given values:
n = 12.5 molR = 0.0821 L atm/mol K (the ideal gas constant)
T = 273 KP
= 1 atm (the pressure at STP)
Substituting these values into the equation above, we get:
V = (12.5 mol)(0.0821 L atm/mol K)(273 K)/(1 atm)V
≈ 273 L
Therefore, the volume of 12.5 moles of H2 at STP conditions is approximately 273 L.
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Describe a method to separate the dyes in coloured inks. [4 marks]
A paper chromatogram from a mixture of two substances, A and B, was obtained using a solvent of propanone. Substance B was found to travel further up the paper than substance A.
What does this tell you about substances A and B. [1 mark]
Look at the boiling points of the three liquids in the table: Liquid Boiling point in °C water 100 ethanol 78 propanol 97 A mixture was made by stirring together equal volumes of these three miscible liquids. Evaluate the effectiveness of fractional distillation as a way of separating this mixture into the three pure liquids.
Answers
Chromatography is a method of separating out materials from a mixture.
Aim: To separate the dye present in ink by the process of evaporation.
Materials required: Beaker, watch glass, water, ink and stove.
Procedure: Take a beaker and fill it to half its volume with water. Keep 3, glass on the mouth of a beaker. Put few drops of ink on the watch glass. Heat the beaker and observe the watch glass.
Observations: We observe some fumes coming from the watch glass. Continue heating till you do not observe any further change on the watch glass. A small residue will be remained on the watch glass.
Inference: We know that ink is a mixture of a dye in water. The residue remained on the watch glass is the dye present in the ink.
Chromatography is a method of separating out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography.
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How many moles of C2H6 in 3.754 x 1023 molecules of C2H6?
Answers
Answer:
n=N/NA
n= 3.754×10²³/6.02×10²³
n= 6.24 s
Explanation
since there is number of molecules, make use of Avogadro's constant to get number of moles.
Which is the best reason for choosing the beaker for heating the solution? the beaker is the only container that can withstand high temperatures. the beaker's wide mouth allows the thermometer to rest against the side. the beaker will not tip over when placed on the hot plate. the beaker is unbreakable.
Answers
The selection of the beaker for heating the solution:
The best reason for choosing the beaker for heating the solution is "The beaker will not tip over when placed on the hot plate".
What is a Beaker?:
A glass container with a flat bottom and a tiny pouring mouth is known as a beaker. It is employed in the chemistry lab to stir, heat, and mix liquids.Beakers can be heated on a hot plate directly. Because of their flat bottoms, these containers will uniformly distribute heat when the mixture is shaken. It is best to heat indirectly any other container without a flat surface.Borosilicate glass, which is frequently used to make glass beakers, has boron trioxide, which gives it the ability to withstand sharp temperature changes. It can endure temperatures of up to 400°C.
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Be sure to answer all parts. Classify the following oxides as acidic, basic, amphoteric, or neutral: (a) Select the acidic oxides: CO2 NO2 Al2O3NO SO3(b) Select the basic oxides: СаOCOSO3K2OBaO(c) Select the amphoteric oxides: K2O Al2O3СаO CO2 SnO2 (d) Select the neutral oxides: CONO SnO2N2O5BaO
Answers
(a) Acidic oxides: CO2, NO2, Al2O3, NO, SO3
(b) Basic oxides: CaO, CO, SO3, K2O, BaO
(c) Amphoteric oxides: K2O, Al2O3, CaO, CO2, SnO2
(d) Neutral oxides: CO, NO, SnO2, N2O5, BaO
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The color _________________ has long wavelengths while the color _________________ has short wavelengths.
Answers
Answer: the color RED has the longest wavelength while the color VIOLET has the shortest wavelength
Consider a bimolecular reaction in the gas phase. Which one of the following charges in condition will not cause an increase in the rate of the reaction? add a catalyst increase the temperature at constant volume Increase the volume at constant temperature All of the above will increase the rate of reaction
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The option that will not cause an increase in the rate of the reaction is: "Increase the volume at constant temperature".
In the gas phase, a bimolecular reaction involves collisions between two molecules. Increasing the temperature at constant volume and adding a catalyst both increase the kinetic energy of the molecules and thus increase the frequency of collisions, which can increase the reaction rate.
However, increasing the volume at constant temperature will decrease the concentration of the reactant molecules, reducing the frequency of collisions and the rate of the reaction.
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How does this benefit me ?
Answers
Answer:
yes cz help me and athers
Explain how scientists study the Earth’s interior. PLEASE HELP :))))!
Answers
Answer:
Scientists study Earth's interior by studying
seismic waves. Seismic waves are waves of energy that travel
through Earth.
Explanation:
What is the steric number of O3(Ozone)