Metals have the property of being shiny. Tellurium is a metal and belongs to the metallic region of the periodic table. Solid nonmetals are brittle, and most nonmetals are poor conductors of electricity.
The property that most metals have in common is that they are shiny. This is due to the way metals reflect light. Metals have free electrons that are able to move around, creating a smooth and shiny surface.
Tellurium is a silvery-white, brittle element that belongs to the metals region of the periodic table.
Most of the elements located directly to the right of the metalloids in the periodic table are nonmetals.
The property that most solid nonmetals have in common is that they are brittle. Nonmetals tend to be brittle because they lack the metallic bonding that gives metals their strength and ductility.
A property that most nonmetals have in common is that they are poor conductors of electricity. Nonmetals do not have free electrons like metals, so they are not able to conduct electricity as well.
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Significant figures communicate the level of precision in measurements
You are right! That is true.
What chemical element did hennig brand discover and what was he boiling down when he discovered it
Most of the mass of an atom is contained in its _____. A. electrons B. protons C. nucleus D. neutrons
What process uses atomic particles and uranium to determine exact age ?
the decay of the neutrons in the nucleus of the atom
The process of radiometric dating uses the decay of uranium-238 to lead-206 to determine the age of ancient rocks.
U-238 decays to stable Pb-206 largely by the emission of α particles, with a half-life of about 4.5 × 10⁹ a.
Thus, geologists can determine the age of rocks by measuring the relative amounts of U-238 and Pb-206.
However, the method is not “exact”.
The rock must be more than ten million years old so that enough uranium can decay to make the amount of lead measurable.
The age uncertainty for 100-million-year-old rocks ranges from 100 000 a
to 3 000 000 a.
The error margin for older rocks, say, 2.5 billion years old, can be as low
as 2 000 000 a. That’s a long time, but it’s an uncertainty of less than 0.1 %.
Round off the measurement 0.0070857 m to three significant figures
A gas at constant volume has a pressure of 4.50 atm at 200. K. What will be the pressure of the gas at 250. K?
The Ideal Gas Law allows us to assume that at constant volume the variation in pressure is proportional to the variation in temperature.
Hence,
[tex]\frac{P1}{T1} = \frac{P2}{T2}\\ \\
\frac{4.50}{200} =\frac{P2}{250} \\ \\
P2 = \frac{4.50 * 250}{200}\\ \\
P2 = 5.63 atm[/tex]
Using Gay-Lussac's Law, we get [tex]P_2[/tex] [tex]5.625 atm[/tex] at [tex]250 K[/tex].
To find the new pressure of a gas at constant volume when the temperature changes, we use Gay-Lussac's Law, which states that pressure is directly proportional to temperature for a given mass of gas at constant volume. The formula for Gay-Lussac's Law is:
[tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]
Where:
[tex]P_1[/tex] is the initial pressure[tex]T_1[/tex] is the initial temperature[tex]P_2[/tex] is the final pressure[tex]T_2[/tex] is the final temperatureGiven:
[tex]P_1 = 4.50 \, \text{atm}[/tex]
[tex]T_1 = 200 \, \text{K}[/tex]
[tex]T_2 = 250 \, \text{K}[/tex]
Rearrange the formula to solve for [tex]P_2[/tex]:[tex]P_2 = P_1 \times \frac{T_2}{T_1}[/tex]
Substitute the known values:[tex]P_2 = 4.50 \, \text{atm} \times \frac{250 \, \text{K}}{200 \, \text{K}}[/tex]
Calculate:[tex]P_2 = 4.50 \, \text{atm} \times 1.25 \\ \implies P_2= 5.625 \, \text{atm}[/tex]
The new pressure of the gas at [tex]250 K[/tex] will be [tex]5.625 atm[/tex].
you rent a car in Germany with a gas mileage rating of 12.8km/L. What is its rating in miles per gallon?
so one liter is about 2. something gallons so at 12.8 km/l you would get about 30 mpg which is insane but yeah
Answer: The mileage rating of the car is 30.05 miles per gallon
Explanation:
We are given:
Mileage rating = 12.8 km/L
To convert this level into milligrams per deciliters, we use the conversion factor:
1 mile = 1.61 km
1 gallon = 3.78 L
Converting the above rating into miles per gallon, we get:
[tex]\Rightarrow (\frac{12.8km}{L})\times (\frac{1mile}{1.61km})\times (\frac{3.78L}{1 gallon})\\\\\Rightarrow 30.05miles/gallon[/tex]
Hence, the mileage rating of the car is 30.05 miles per gallon
Please help ASAP. I'm stuck on this one question. >.<
Which is a pure substance?
A. A mixture
B. A solution
C. a compound
C. A compound !hope this helps!
Im pretty sure the answer is C. a compound
Classify the reactions as endothermic or exothermic....PLEASE HELP ASAP
1) Endothermic reactions:
a) The reaction between ammonium nitrate and water absorbs heat from the surrounding environment.
There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).
b) Ammonium chloride dissolved in a beaker of water makes the beaker cold.
Dissolving this salt absorbs heat from beaker.
c) Water separates on hydrogen and oxygen when an electric current is run through it.
Electrolysis of water is the decomposition reaction (heat is required), because from one molecule (water) two molecules (hydrogen and oxygen) are produced. Water is separated into two molecules.
2) Exothermic reactions:
a) Three drops of concetrated sulfuric acid added to 100 milliliters in a beaker makes the beaker hot.
Energy is released, beaker absorbs that heat.
b) Uranium atoms are split to produce nuclear energy.
Nuclear energy is released.
c) Methane and oxygen are combined to produce methanol and heat.
Balanced chemical reaction: 2CH₄ + O₂ → 2CH₃OH + heat.
Upon landing, the 90.7 kg carbon fiber brakes of an airliner heat up 312∘C, producing heat. As the brakes start to cool back to their initial temperature, the heat is absorbed by the 123 kg rubber tires. Assuming that all of the heat is transferred from the brakes to the tires, what is the specific heat of the tires if their temperature rises 172∘C?
Round your answer to two decimal places.
Use 1.400Jg∘C for the specific heat of carbon fiber.
The calculation results in a specific heat of approximately 1.89 J/g°C.
To calculate the specific heat of the tires we first find the amount of heat absorbed by the brakes when they cool down.
Using the formula Q = mcΔT:
Heat absorbed by brakes Q = (90.7 kg)(1.400 J/g°C)(312°C)
Note that 1 kg = 1000 g, so we convert the mass of brakes from kg to grams.
Q = (90700 g)(1.400 J/g°C)(312°C) = 39930720 J
This same amount of heat is transferred to the tires. We can now calculate the specific heat of the tires.
Q = mcΔT, where m is mass, c is specific heat, and ΔT is the temperature change.
Rearranging the formula to solve for specific heat c:
c = Q / (mΔT)
Substituting Q = 39930720 J, m = 123000 g (since tires are 123 kg), and ΔT = 172°C:
c = 39930720 J / (123000 g * 172°C)
c = 39930720 J / 21156000 g°C
c = 1.89 J/g°C
The specific heat of the tires is approximately 1.89 J/g°C.
Please help so I can study I am also giving brainest anwer
What happens when metals and nonmetals react?
No electrons are shared or move.
Electrons move from the metals to the nonmetals.
Electrons move from the nonmetals to the metals.
Electrons are shared equally.
B. Electrons move from metals from nonmetals creating ionic compounds.
(PLEASE HELP will give first correct answer brainliest!!) Which option correctly describes glucose catabolism?
1. Glucose is broken down in glycolysis, yielding two ATP molecules; after the Krebs cycle, 34 molecules of ATP are formed in ETS reactions.
2. Glucose is broken down in glycolysis, yielding pyruvic acid; after the Krebs cycle, two molecules of ATP are formed in ETS reactions.
3. Glucose is broken down in glycolysis, yielding two ATP; after the Krebs cycle, NADH and FADH2 are formed, yielding NAD+ and FAD in ETS reactions.
4. Glucose is broken down in glycolysis, yielding pyruvic acid; after the Krebs cycle, NADH and FADH2 are formed, yielding 34 ADP in ETS reactions.
what is the strongest metal known to man? may mark brainliest
I'm pretty sure the strongest metal known to man is Tungsten.
Which examples demonstrate responses to stimuli? Check all that apply.
A. A Venus flytrap closes on a fly.
B. Large amounts of bacteria are present in a soil sample.
C. A plant grows toward the sunlight.
D. A rabbit has both white and black fur.
E. Bright lights cause a baby to blink.
Answer:
A.C. and E.
Explanation:
i just got it right so that's it.
Jena's blueberry-pineapple smoothie measured 200g and was contained in 300ml. What is it's density?
The density of Jena’s smoothie is 0.667 g/mL.
Mass = 200 g
Volume = 300 mL
Density = mass/volume = 200 g/300 mL = 0.667 g/mL
Answer:
rounded it is 0.67 g/ml
Explanation: i took the test it was a bit confusing but i figured it out
What is the name for the ocean current that brings warm water from the Gulf of Mexico to Western Europe
that is called the Gulf Stream
question answered by
(jacemorris04)
What is the formula for water
Formula for water? There is no formula, but there is a symbol, if that's what you meant. The symbol for water is H2O. It means 2 Hydrogen molecules, because the symbol is H. And the O stands for Oxygen. So it meands two hydrogen molecules bonded with one oxygen molecule. Hope I helped :)
Answer:
Explanation:
what do you mean do you mean H2O
How many moles of ammonia, NH3, can be made from 7.5 moles of H2? N2 + 3H2 → 2NH3 A. 15 moles B. 22 moles C. 5 moles
The reaction will produce C. 5 mol NH₃.
N₂ + 3H₂ ⟶ 2NH₃
Moles of NH₃= 7.5 mol H₂ × (2 mol NH₃/3 mol H₂) = 5 mol NH₃
5 moles of ammonia, [tex]NH_3[/tex], can be made from 7.5 moles of [tex]H_2[/tex].
What is a mole?The mole is an SI unit used to measure the amount of any substance. The abbreviation for a mole is mol. One mole is exactly 6.02214076×[tex]10^{23}[/tex] particles.
Given data:
Moles of H₂ react = 7.5 mol
Moles of NH₃ formed =?
Chemical equation:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of ammonia with hydrogen.
H₂ : NH₃
3 : 2
7.5 : [tex]\frac{2 X 7.5}{3}[/tex] = 5
Hence, 5 moles of ammonia would be formed from 7.5 moles of hydrogen.
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What happened to the moon and earth if the sun did not exist
Anything in orbit around the Sun is basically moving fast enough to be in a constant state of freefall towards it. If the planets, for example, suddenly stopped moving they would immediately be pulled towards the Sun and fall into it.
What is one chemical property of iron?
A) Iron is malleable.
B) The density of iron is 7.86 g/cc.
C) Iron combines readily with oxygen.
D) Iron is a good conductor of electricity and heat.
A chemical property of iron is its ability to combine with oxygen to form iron oxide, commonly known as rust; this process is known as corrosion. Therefore, the correct answer is that iron combines readily with oxygen "C".
The question asks about the chemical property of iron. Chemical properties describe the ability of a substance to undergo a specific chemical change. For iron, a key chemical property is its capability to combine with oxygen to form iron oxide, commonly known as rust. This process is part of a broader category of chemical changes known as corrosion. Unlike physical properties, which can be observed without changing the substance, chemical properties can only be seen as the substance is transformed into a different substance. Therefore, the correct answer to the question is C) Iron combines readily with oxygen.
If an decrease in temperature accompanies a reaction, what occurred?
I think the correct answer from the choices listed above would be the last option. If a decrease in temperature accompanies a reaction, then energy was absorbed which means that the reaction is endothermic. Hope this answers the question. Have a nice day.
Answer:
It should be endothermic reaction.
Explanation:
Because it absorbs more energy than release it.
I took the test before.
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Chemical Reactions Learning for quiz Unit 3 Lesson 2 Physics
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What is the pH of a 0.28 M solution of ascorbic acid
Hey there!
Values Ka1 and Ka2 :
Ka1 => 8.0*10⁻⁵
Ka2 => 1.6*10⁻¹²
H2A + H2O -------> H3O⁺ + HA⁻
Ka2 is very less so I am not considering that dissociation.
Now Ka = 8.0*10⁻⁵ = [H3O⁺] [HA⁻] / [H2A]
lets concentration of H3O⁺ = X then above equation will be
8.0*10−5 = [x] [x] / [0.28 -x
8.0*10−5 = x² / [0.28 -x ]
x² + 8.0*10⁻⁵x - 2.24 * 10⁻⁵
solve the quardratic equation
X =0.004693 M
pH = -log[H⁺]
pH = - log [ 0.004693 ]
pH = 2.3285
Hope that helps!
what are the limitations of the Klmn electronic configuration style of writing
In the KLMN electronic configuration style of writing K denotes the first shell which can hold up to two electrons, L denotes the second shell which can hold up to eight (2 + 6) or 8 electrons, M denotes the third shell which can hold up to eight (2 + 6 + 10) or 18 electrons etc.
The KLMN style of writing only indicates the number of electrons in each principal quantum number, however the spdf electronic configuration style of writing subdivides each shell into its subshells.
For instance the 3rd principal quantum number has s,p and d subshells, wherein s, p and d orbitals can have a maximum of 2, 6 and 10 electrons respectively.
Which of the following is plotted on the y-axis of a distance versus time graph? A.Distance B.Time C.Slope. D.Velocity
Hello,
Question - Which of the following is plotted on the y-axis of a distance versus time graph?
Answer - A. Distance
Why - The reason its distance is because the fact that distance is a dependant variable and always will remian on the y axis.
WILL GIVE BRAINIEST
Listed in the Item Bank are some important labels for sections of the image below. To find out more information about labels, some have more details available when you click on them. Drag and drop each label to the corresponding area it identifies in the image.
Word Bank:
Alkali Metals
Alkaline Earth Metals
Metalloid
Metals
Noble Gas
Nonmetal
Transition Metals
Explanation:
Elements of group 1 represented in the blue column are alkali metals.
Elements of group 2 represented in the peach column are alkaline earth metals.
Elements from scandium to zinc or all the elements represented in the green columns are transition metals.
Elements in coral pink boxes represent metalloids, that is, they show properties of both metals and non-metals.
Elements present in blue, peach, green and coral pink boxes are all metals.
Whereas elements present in pink, that is, group 18 are all noble gases.
And elements present in yellow boxes are all non-metals.
which two elements are most likely to form an ionic bond? krypton and lithium, magnesium and silicon, calcium and potassium, iodine and chlorine
what is the answer for this thing below? and how you've done it.
[tex]8x - 9 = 8[/tex]
To solve this, first add 9 on both sides.
8x-9+9=8+9
8x=17
Then divide both sides by 8 to find the value of x.
[tex]\frac{8x}{8}[/tex]=[tex]\frac{17}{8}[/tex]
x=[tex]\frac{17}{8}[/tex]
The final answer is x=[tex]\frac{17}{8}[/tex] or 2.125.
What is the name of the compound CO?\
Carbon Monoxide would be the correct answer.
an atom of gallium has 31 proton and a mass number of 70 what is the atomic number for an atom of gallium
Hello!
Atomic Number, is the number where the atom lays on the perodic table and can be found through the number of protons. Meaning that gallium has an atomic number of 31 !
Atomic weight, which is equal to 70 in this case, can be found by subtracting the atomic number from that total to find the remaining number of neutrons that make up the mass. So gallium has 31 protons and 39 protons.
Hope this helps answer your question.
Answer: The correct answer is 31.
Explanation:
Atomic number is defined as the number of protons or electrons that are present in a neutral atom.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Mass number = Number of protons + Number of neutrons
We are given:
Number of protons = 31
Mass number = 70
Number of neutrons = Mass number - Number of protons = 70 - 31 = 39
Atomic number will be equal to the number of protons present in an atom which is 31
Hence, the correct answer is 31.
If the frequency of an FM wave is 8.85 × 107 hertz, what is the period of the FM wave?
Answer: The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].
Explanation:
Frequency of the wave = [tex]8.85\times 10^{7} Hertz[/tex]
Frequency is inverse of time period that is :
[tex]Frequency=\frac{1}{\text{Time period}}[/tex]
[tex]\text{time period}=\frac{1}{frequency}[/tex]
[tex]=\frac{1}{8.85\times 10^{7} Hertz}=0.11299\times 10^{-7} seconds=1.1299\times 10^{-8} seconds[/tex]
The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].