Answer:
The correct answer is A, or "so they can effectively communicate their findings.
Explanation:
The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.
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PLS I WILL GIVE BRAINLY How do the number of violence electrons of the light metals compared to those heavier than boron
The valence electron of the light metals are all in the range of 1 to 3.
What are Valence electron ?Valence Electron is the number of electrons in the outer shell of an atom which participate in bond formation.
Number of Valence Electron in Boron is 3 and other light metals lighter than Boron have 1 , 2 of Lithium and Beryllium respectively,
The valence electron of the light metals are all in the range of 1 to 3.
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Name all these please I need help. Write the names of the fallowing accoring to the IUPAC rules.
#1
You used red pen highlight which made things messier
The correct name should be.
9-methyl dec-1,2-dieneAs a methyl group attached with 9th carbon
#2
methyl group at 4
double bond at 2
4-Methyl Pent-2-ene#3
Three methyl groups are present
Double bond at 2
2,5,5-Trimethyl Hex-2-ene#4
2,5-Dimethyl Hept-3,5-diene#5
2,5-Dimethyl Hex-3-ene
Having problems figuring out molar mass in general. steps would be most appreciated.
Answer:
The periodic table
Explanation:
As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.
When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.
example. Find the molar mass of
H₂SO₄
Hydrogen (2) + sulphur (1) +oxygen (4)
= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)
=1(2) + 32(1)+16(4)
=2+32+64
=98
N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript
pls help me with this chem question
Answer:
B
Explanation:
i just know
Answer:
B
Explanation:
Hydrocarbons are with hydrogen and carbon only, so therefore you can immediately eliminate C and D. Therefore, we are left with A and B. Unsaturated hydrocarbons have double bonds or more, so B would be our answer (Double bond between carbon 1 and 2)
Two chemicals react in an endothermic reaction. what can be known about this reaction? the new substance will need more energy to form its chemical bonds than the old substance will release. more energy will be released from the old substance than the new substance will need to form its chemical bonds. a precipitate will form as a result of the reaction. a gas will form as a result of the reaction.
The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.
Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.
The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.
When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
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At what temperature would 0.46 moles of a gas occupy 13.3 L if the pressure is 734 mm Hg?
Answer: 339.84 K
Explanation:
[tex]$$We are given: \\$\mathrm{n}=0.46$ moles \\$V=13.3 \mathrm{~L}$\\$\mathrm{P}=734 \mathrm{~mm} \mathrm{Hg}=0.965 \mathrm{~atm}$\\Putting these values in ideal gas equation we get:\\$0.965$ batm * $13.3 \mathrm{~L}=0.46 \mathrm{~mol} * 0.0821 \frac{\mathrm{atmL}}{\mathrm{molK}} * \mathrm{~T}$\\$\mathrm{T}=\frac{0.965 * 13.3}{0.46 * 0.0821} \mathrm{~K}$$$\mathrm{T}=339.84 \mathrm{~K}$$[/tex]
Which of the following atoms require the greatest amount of ionization energy? Cu, Ag, or Au
Ionization energy is the periodic property of an element. The copper atom has the highest ionization energy among gold and silver atom.
What is ionization energy?Ionization energy is the amount of energy required for the removal of the loosely bounded electron from an atom. The ionization energy can be first, second, and third based on the number of electrons.
Ionization energy down the group decreases from top to bottom as the atomic radii of the element increase. So, the ionization energy for the given elements is Cu > Au > Ag.
Therefore, copper has the highest ionization energy.
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A company is announcing the construction of a new skyscraper to the public. Which model will give the best idea of how the new building will change the city skyline?
A.
a drawing showing the interior of the building
B.
a full scale, three-dimensional model of the building
C.
a rough sketch of the building's shape
D.
a drawing showing both the new and old buildings
Answer:
D.
Explanation:
This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.
How do you know which element the little number (subscript) goes with?
Answer:
you will not
Explanation:
the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.
there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1
Answer:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.
In industrialized states every tenth adult suffers daily, and every third occasionally, from heartburn. In Germany almost ten million people are affected by this disease. Helpful medicines against heartburn are the so-called ‘antacids’.
Antacids bound acids against an over-acidification of the stomach. The stomach acid contains hydrochloric acid (HCl, dissolved in water), which reacts with the antacid to form water, carbon dioxide and the corresponding salt. Generally, antacids are carbonates. Very common is ‘Bullrichs salt’, which uses sodium hydrogen carbonate as active ingredient. A single dose of an antacid is to be chosen in a way that it will react with two grams of hydrochloric acid. You are to formulate the instruction leaflet for a pharmaceutical company, which sells calcium carbonate (CaCO3) as an antacid. The dosing instruction says that in case of heartburn, one tablet with sufficient water is to be ingested.
But the specification, how many grams of calcium carbonate one tablet contains, is still missing…
Answer:
Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.
How many moles of na contain 7.88x1021 atoms of na
Answer:
the answer to the qustion is 0.013089701 na
Explanation:
n/a
Based on Charles's law, which of the following statements is true for an ideal gas at a constant pressure and mole amount?
The number of collisions is independent of volume.
The number of collisions decreases with increase in volume.
Volume is directly proportional to absolute temperature.
Volume is inversely proportional to absolute temperature.
Answer:
the number of collisions is independent of Volume.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
What is Charles's law?Gases have a propensity to expand while heated, according to Charles' law, an innovative gas law.
What is collisions?A collision would be any situation in where two or even more bodies quickly number of factors on one another.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
Therefore, the correct answer will be option (A).
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After learning about climate change in her science class, selena wants to make a few changes at home so she can affect climate change in a small way. which changes will give her the best results?
Selena can change from burning fossil fuel in her home to using solar energy.
What causes climate changes?Climate change is caused by the release of the greenhouse gases which is gotten through the use and burning of fossil fuels such as coal.
The use of solar panels and solar energy by Selena in her house can help adjust the climate changes by decreasing the amount of greenhouse gases released into the atmosphere.
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20 ml of a mixture of C2H6 and C3H8 gases in X : Y mole ratio, is burnt completely by which 52 ml CO2 gas is evolved. If 20 ml of a mixture of CH4 and C4H10 gases in Y : X mole ratio is burnt completely then what is the volume (in ml) of CO2 gas evolved?
A) 40 B) 44 C) 50 D) 55
The volume of CO2 prodiced when 12 mL of CH4 and 8 mL of C4H10 is burnt is 56 mL.
What is the equation of the reaction?The equation of the combustion of C2H6, CH4, C4H10, and C3H8 gases are given below:
2 C2H6 + 7 O2 ---> 4 CO2 + 6 H20
C3H8 + 5 O2 ---> 3 CO2 + 4 H20
CH4 + 2 O2 ----> CO2 + 2 H2O
2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O
X moles of C2H6 will produce 2X moles of CO2
Y moles of C3H8 will produce 3Y moles of CO2
Thus;
X + Y = 20 mL
X =20 - Y ---(1)
2X + 3Y = 52 mL ---(2)
Solving for X by substituting in (2)
2 (20 - Y) + 3Y = 52
40 - 2Y + 3Y = 52
Y = 12 mL
Then X = 8 mL
Volume of CO2 produced when 12 mL of CH4 and 8 mL of C4H10 is burnt = (12 × 2 + 8 × 4) = 56 mL
Therefore, the volume of CO2 produced is 56 mL.
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a person who eats three servings of the cereal without milk will consume__ calories__ grams of carbohydrates
A person who eats three servings of the cereal without milk will consume about 117 percent of calories.
What is Calorie?This is defined as a unit of energy and is commonly used in the body system.
One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.
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(i) Give the two dyes that are mixed to make brown hair dye.
Answer:
green n yellow and white and black and white sq
Compare the temperature change for cold sand and cold water when the same amount of hot water was added. what do you discover?
When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
What is specific heat capacity?Specific heat capacity is the quantity of heat required to raise a unit mass of a substance by 1 kelvin.
Specific heat capacity of water and sandWater, c = 4,200 J/kg⁰C
Sand, c = 830 J/kg⁰C
Q = mcΔθ
where;
Δθ is temperature changeQ is quantity of heat addedΔθ = Q/mc
Thus, for an equal mass of water and sand, when the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
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Answer:t
Explanation:
density is ______ to pressure
Answer:
When pressure increases, density increases.
When the pressure decreases, density decreases.
When density increases, pressure increases.
When density decreases, the pressure decreases.
Explanation:
Select the correct answer from each drop-down menu. a 126.1-gram block of granite at 92.6°c is dropped into a tub of water at 24.7°c in an isolated system. the final temperature of both the granite and the water is 51.9°c. the specific heat capacity of granite is 0.795 joules/gram degree celsius, and the specific heat capacity of water is 4.186 joules/gram degree celsius. the granite block transferred of energy, and the mass of the water is .
Taking into account the definition of calorimetry, the mass of water is 35.70 grams.
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance c. ΔT is the temperature variation.Mass of water in this caseIn this case, you know:
For granite:
Mass of granite= 126.1 gInitial temperature of granite= 92.6 °CFinal temperature of granite= 51.9 ºCSpecific heat of granite = 0.795 [tex]\frac{J}{gC}[/tex]For water:
Mass of water = ?Initial temperature of water= 24.7 ºCFinal temperature of water= 51.9 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgranite = + Qwater
- 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
Solving:
4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C
4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water
mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]
mass of water= 35.70 grams
Finally, the mass of water is 35.70 grams.
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What kind of scientist would study how mistletoe harms trees
Answer:
A Dendrologist! They are the type of Scientist that studie trees.
Can anyone help me figure this out
Answer:
go with the fourth one because I did that one
What differences do you notice when you heat up the brick and the iron at same temperature?
After heating the brick and the iron, it is observed that the brick heats up quicker and the brick releases energy quicker.
What is thermal energy?Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
The iron has more energy than the brick even though it is at the same temperature. That means that the iron must have more particles than the brick.
Iron and brick are both solids and have the same volume, so the difference in total energy must be due to atomic composition.
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Which two phase changes occur when you increase the heat?
Answer:
Heat going into a substance changes it from a solid to a liquid or a liquid to a gas. Removing heat from a substance changes a gas to a liquid or a liquid to a solid.
Liquid → Gas:
VaporizationGas → Liquid:
CondensationSolid → Liquid:
Melting or fusion
Solid → Gas: Sublimation
Explanation:
if energy can neither be created nor destroyed, into what kinds of energy have these resources been transformed?
Answer:
Heat, Sound
Explanation:
I am pretty sure you are addressing mechanical energy and machine efficiency. So you are probably aware a machine can't achieve 100% efficiency because of the first and second laws of thermodynamics. This energy is lost to friction and air resistance. They convert some gravitational potential energy to heat and sound energy rather than all to kinetic energy, and vice versa.
a student used a vernier magnetic field sensor to measure the strength of the magnetic field generated by a bar magnet. at which position is the
strength of the magnetic field strongest point a or point b?
The position is the strength of the magnetic field strongest is is the place where the magnetic field leaves, being point A.
What generates a magnetic field?When an electrically charged particle moves, it creates a magnetic field. According to the laws of electromagnetism, this magnetic field originates from the variation of the electric field strength.
In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense.
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what is the specific heat capacity of propan-1-ol
Answer:
14
Explanation:
sun normal persentage is 14
A solution of potassium nitrate is made when potassium nitrate dissolves in water.
Describe a method you could use to obtain crystals of potassium nitrate from
potassium nitrate solution.
You should include an explanation of the process by which the crystals are produced
from the solution.
[6 marks]
Answer:
Boil the water and stir in potassium nitrate. If it doesn't all dissolve, you can cook it on the stove or microwave it until the water boils again. Remove the solution from heat, but let it cool slowly for the best crystal formation.
compare molecular & covalent network crystal solid?
Answer:
Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.
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In the chemical equation below, name the reactant(s) and product(s).
CH4 (g) + O2 (g) → CO2 (g) + H₂O (g)
Answer:Methane(CH4) and dioxygen(O2) are the reactants
Carbon dioxide(CO2) and water(H2O) are the products
Explanation:
which compund do not exist in independant molecular form
Answer:
Ionic compounds do not exist in independent molecular form
-Lexi