Answer:
?
Explanation:
Is there supposed to be a picture or is that only 5he question?
What is the independent variable?
Time or Concentration?
the local high school recently passed a rule reducing how much teachers can count homework as a part of a student's grade. Consequently, a larger portion of the students stop doing their homework. A teacher there decides to conduct there experiment. All of his classes get an optional ''test guide'' to help them study for their test.
An experiment occurs when we want to study the relationship between the dependent and the independent variable. We know that the independent variable is the variable that is manipulated in the experiment and the dependent variable variable is the variable that undergoes a change as we change the independent variable.
It must be known that an experiment is the only way that we could be able to establish a cause and effect relationship. In other words, the results of an experiment tell us categorically if the effect owes to a supposed cause as was captured in the hypothesis of the experiment.
In this case we have the following in this experiment;
The independent variable is the use or absence of the test guide
The dependent variable is the overall performance in the academic year
The control group is the group that did not use the test guides
The experimental group is the group that used the test guides
The constants are the method of instruction, the structure of the test and the difficulty of the test.
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Missing parts;
The local high school recently passed a rule reducing how much teachers can count homework as part of a student's grade. Consequently, a larger portion of the students stop doing their homework. A teacher there decides to conduct an experiment. All of his classes get an optional "test guide" to help them study for their tests. He allows two classes to use the "test guides" (that they must fill in and complete) on their exams. He hypothesizes that students will complete the test guides and learning will occur from filling them out. In his other 2 classes, the teacher does not allow students to use test guides on the exam, and consequently very few of them filled them out. After the 2017-2018 year is over, he wants to compare scores between the 4 classes on the final exam to see if allowing students to use test guides during each test throughout the year improved their later overall performance.
Independent Variable: _____________________________ Dependent Variable: ___________________________________
Experimental Group: _______________________________ Control Group: _________________________________________
3 constants: ______________________________________________________
Moisture is in the air, as compressed air cools it condenses, why must moisture be removed from air feeding pneumatic controls?
The moisture must be removed from air feeding pneumatic controls because moisture corrodes the walls of an air cylinder, dilutes the oil needed for the head and rod, and reduces reaction time.
What is the mechanism of a pneumatic controller?
A pneumatic controller is a mechanical apparatus created to gauge temperature or pressure and send a corrective air signal to the last control element. The heat or pressure sensing system and the air signal relay system work together to power a pneumatic controller.
Moisture corrodes the walls, dilutes the oil needed for an air cylinder's head and rod, and slows reaction time. Efficiency and output are lost as a result. Rubber valve diaphragms may harden and rupture if moisture is allowed to get to them. Spools and pistons can develop pits as a result of moisture.
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This problem has to be solved using algor mortis.
3. Approximately how long as the victim been dead if his body temperature was 85.2 F?
Answer:
The victim has been dead for approximately 12 hours.
Explanation:
Algor mortis, or the cooling of the body after death, is a reliable way to estimate time of death. The average body temperature is 98.6 degrees Fahrenheit, so 85.2 degrees Fahrenheit would be 12 hours after death.
an iron ( Fe ) bar that loses 2.42 kJ when its temperature decreases from 252 ∘C to 79 ∘C
The calculated mass is 35.6.
The movement of minuscule atoms, molecules, or ions in solids, liquids, and gases produces heat energy. From one thing to another, heat energy can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.
Q = m*c*ΔT,
ΔT = Initial T - Final T
For iron, the specific heat capacity is 0.450 J/(g°C) and ΔT Q is the heat energy in calories (2.92 KJ = 2920 Joules).
The mass of water is m.
The values 2920 J= m* 0.450 J/g°C * are entered (254 °C-72 °C)
The solution is mass=2920 J/ 0.450*180°C
mass = 35.6.
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Water (2450 g ) is heated until it just begins to boil. If the water absorbs 5.35×105 J of heat in the process, what was the initial temperature of the water?
Express your answer with the appropriate units.
The initial temperature of water is 47.8⁰C
In this case, the challenge is to determine how much heat is required to bring a particular sample of water from its original temperature to its boiling point.Given,
mass of water is 2450g
absorbed heat is 5.35×105 J
we have to find out initial temperature
First Calculate the change in temperature when 5.35×10^5 J of heat is provided to 2450g of water.
q = m . c . ∆T
q is amount of heat gained
m is the mass of water
c is the specific heat of the substance
∆T is change in temperature
Specific heat of water is 4.18 J/g⁰C
∆T = q / m . c
= 5.35×10^5 / 2450 × 4.18
= 52.2⁰C
Now we know that the final temperature of the water is
100⁰C and that this final temperature is 52.2⁰C
is higher than the initial temperature of the water.
So by, ∆T = T(f) - T(i)
T(i) = T(f) - ∆T
T(i) = 100⁰C - 52.2⁰C
= 47.8⁰C
Therefore, initial temperature of water is 47.8⁰C
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Determine the volume of hydrogen gas needed to react completely with
5.00 L of oxygen gas to form water,
The volume of hydrogen needed to react with 5.00 L of oxygen based on the mole ratio is 10.00 L.
What volume of hydrogen gas is needed to react with 5.00 L of oxygen?The volume of hydrogen gas is needed to react with 5.00 L of oxygen is determined from the mole ratio of the reactants as shown in the equation of reaction below:
Equation of reaction: 2 H₂ + O₂ → 2 H₂O
Mole ratio of hydrogen to oxygen = 2 : 1
Moles of gases occupies equal volume
Therefore, Volume ratio of hydrogen to Oxygen = 2 : 1
Volume of hydrogen needed to react with 5.00 L of oxygen = 5.00 * 2
Volume of hydrogen needed to react with 5.00 L of oxygen = 10.00 L
In conclusion, the volume of hydrogen required is obtained from the mole ratio of hydrogen and oxygen in the reaction.
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a tightly packed box of crackers contains 250 g of crackers and measures 7.0cm X 17.0.cm X 19.0 cm. what is the average density in kilograms per liter of the crackers in the package? Assume that the unused volume is negligible.
The average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.
How to calculate average density?The density of a substance is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated using the following formula:
D = m/v
Where;
D = densitym = massv = volumeAccording to this question, a tightly packed box of crackers contains 250 g of crackers and measures 7.0cm X 17.0.cm X 19.0 cm.
Volume = 7.0cm X 17.0.cm X 19.0 cm = 2261cm³
1 cubic centimetre = 0.001 litre
2261cm³ = 2.261L
Density of the crackers = 0.25kg ÷ 2.261L
Density = 0.1105Kg/L
Therefore, the average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.
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What is the molarity of a solution of 0.5 mol of Cu(NO3)2 in 0.5 L water?
OA. 2 M
OB. 1 M
C. 0.25 M
OD. 0.5 M
The molarity of a solution of 0.5 mol of Cu([tex]NO_3[/tex][tex])_2[/tex]in 0.5 L water is 1 M.
molarity of a solution of 0.5 mol of Cu([tex]NO_3[/tex][tex])_2[/tex] in 0.5 L water
as per statement , we have got
moles of Cu(NO3)2 = 0.5 mol
volume of solution = 0.5 L
now:
we use the formulae of molarity written as M
molarity = moles of solute / volume of solution
molarity = 0.5/0.5
molarity = 1 M
Molarity is defined as the number of moles of solute per liter of solution.molarity is a volume based concentration, as the temperature increases the volume increases and molarity decreases but the molality is not depend on volume is by the variation in temperature molality remins constant.To know more about molarity visit :
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find heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C
Heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C is 22.23 J/ ∘C g .
from the above statement we have got
Q = 47.0 J
MASS = 13.0 g
temperature (T) = 1.71 ∘C
heat capacity ( c ) = ?
NOW, from the formulae , Q = mcΔt
put all the values given in equation
47.0 J = 13.0 g [tex]\times[/tex] c [tex]\times[/tex]1.71 ∘C
c = 47.0 ÷ 13.0[tex]\times[/tex]1.71
c = 47/22
c = 22.23 J/ ∘C g
heat capacity It is the amount of heat energy required to elevate the temperature of an object by 1 degree celsius.To know more about heat capacity visit :
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Whats oxide element name
Answer: Oxide anion. Oxide ion. Atomic oxygen(2-) Oxygen, ion(O2-)
Description: Oxide(2-) is a monoatomic oxyge...
Molecular Formula: O-2
Synonyms: oxideoxide(2-)16833-27-5Oxide a...
Molecular Weight: 15.999
Explanation: I hope this helps.
Q1.
An athlete decides to try a new type of protein drink after he exercises.
(a)
The athlete tests the protein drink to check it contains protein.
Which solution is used to test for protein in the drink?
Tick one box.
Benedict's
Biuret
lodine
Universal indicator
To check the protein in the drink the test carried out is Biuret Test
What is Biuret Test?
The chemical test known as the "Biuret test" uses the Biuret reagents to produce the compound known as "Biuret," which is created by heating urea to 180 °C. A 1% solution of Copper II sulphate is used in the test
([tex]CuSO_{4}[/tex]). The peptide bonds found in proteins create a compound with the [tex]Cu^{2+}[/tex] in the Biuret reagent. This test therefore aids in identifying peptide bonds in any substance.
The reagent in the biuret test does not really include biuret; however, the test's name derives from the fact that the peptide-like linkages in the biuret molecule produced a favorable reaction.
Two of the many more sophisticated variations of the biuret test are the Lowry test and the BCA test.
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Explain why pure iron is malleable
Answer:
Metals are malleable : They can be bent and shaped without breaking. This is because they consist of layers of atoms that can slide over one another when the metal is bent, hammered or pressed.
Explanation:
Pure iron is a bright silvery white metal which oxidizes (rusts) rapidly in moist air or in water containing dissolved oxygen. It is soft, malleable, and ductile, and is strongly magnetic (ferromagnetic).
convert 64.3 kilograms to milligrams
Answer:
64.3 kilograms = 64300000 milligrams
Hope this helps :)
Pls help which of the following statements is true
A. None are correct.
Explanation:
Proton has positive charge and mass too.
A neutron is chargeless and has mass as well.
An electron has negative charge and has mass.
The atomic number of carbon is 6.
Hence none are correct.
4. In what region of the periodic table are you likely to find elements that form more than one stable
ion?
Answer:
in the middle region of the periodic table, where the transition metals are
aka between Group II and III
To separate a mixture of hard candies and
marbles, the most efficient method would be
DONE
To separate a mixture of hard candies and marbles, the most efficient method would be filtration .
A mixture is just the physical mixing of a mixture's constituent parts, including suspensions and colloids, that maintain their identities and are thus combined in the necessary proportions.
One or more sweetener syrups are heated to 160°C to create a sugar confection known as a hard candies , often referred to as a boiled sweet.
To avoid damaging the water pipes, boil the candies if marbles are present unless they dissolve in water. Then, place a filter in the sink and run cold water for two minutes when pouring the water into the strainer and after emptying it.
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calculate the volume in (L) of 1.13x10^5 grams of liquid sodium which has a density of 0.929g/cm3
The volume of the liquid sodium is 121.64 L
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can obtain the volume of the liquid. Details below
How to determine the volume of the sodium liquidMass of liquid = 1.13×10⁵ gDensity of liquid = 0.929 g/cm³Volume of liquid =?Density = mass / volume
Thus,
Volume = mass / density
Volume of liquid = 1.13×10⁵ / 0.929
Volume of liquid = 121636.17 cm³
Divide by 1000 to express in liter
Volume of liquid = 121636.17 / 1000
Volume of liquid = 121.64 L
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Question 5 (1 point) Which statement is NOT TRUE about molecules and compounds? a All molecules and compounds are made of atoms. b Compounds are made up of the same type of atom. c All molecules are compounds. d Molecules are made up of two or more chemically bonded atoms.
All molecules are not compounds. Option C.
What are compounds?A compound is a substance made from two or more atoms of different elements that are linked together by bonds. The bond could be an ionic, covalent, metallic, or hydrogen bond.
A molecule, on the other hand, is a group of atoms, the same or different, chemically bonded together and represents the smallest fundamental unit that can participate in chemical reactions.
Going by these two definitions, one can conclude that while all compounds are molecules, not all molecules are compounds. If the group of atoms that bond together is chemically identical, a molecule is formed but not a compound.
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Gelatinous precipitate such as Aluminium hydroxide are best filtered using O a. ashless filter paper b. ash filter paper O c. oxalate d. sintered glass crucible.
Ashless filter paper is the correct option.
The process of turning unusable water into drinkable (potable) water is known as water purification. Since water creates an excellent solvent, getting pure water without treatment is challenging.Coarse filtering is used in the initial stage to get rid of big foreign objects. By letting the water pass through a mesh screen, this is accomplished. Sedimentation is the subsequent phase. To allow for the separation of tiny particles, the water is left to stand. Aluminum sulfate and calcium oxide in the water help in this process. Aluminum hydroxide reacts with some of the water to generate a gelatinous substance. The slow-moving gelatinous precipitation drags down particles as it settles.Following aeration, the water is filtered through a fine sand bed to oxidize dissolved organic molecules. Sterilization of the water is the last step. This is frequently done by bubbling chlorine gas through the water, which creates a mild acid that kills any germs that are still present. In this procedure, ozone can also be employed in place of chlorine.Therefore, option a. is correct.
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In a density measurement, you determine the mass of an object to be 10.50 +/- 0.02 g and the volume of the object to be 1.638 +/- 0.005 mL. You divide the mass by the volume to determine the density of the object in g/ml. What is the final propagated error on the density?
Select one:
a.
+/- 0.0004 g/mL
b.
+/- 0.04 g/mL
c.
+/- 0.0002 g/mL
d.
+/- 0.02 g/mL
The final propagated error on the density is +/-0.02g/mL
The density is the amount of a specific material per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per centimeter are a common measurement unit used for density.
The relationship between mass and volume can be easily determined using density; for instance, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). By multiplying a body's mass by the acceleration of gravity, one can get the weight of the object, which is usually more important practically than its mass.
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A __________ is a piece of land that is formed when a river splits into smaller rivers before flowing into an ocean.
butte
delta
glacier
hill
Answer: A) Delta
Explanation:
A river delta is a landform shaped like a triangle, created by deposition of sediment that is carried by a river and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or another river that cannot carry away the supplied sediment.
Hope this helped!
How many moles of each type of atom are in 1.0 mol of K2Cr2O7?
1.0 mol of K₂ Cr₂07 contains 2 mol K, 2 mol per 7 mol 0.
One mole of atoms of any element carries 6.022 X 1023 atoms, regardless of the kind of detail. Use the periodic table to determine the molar mass of the element. Divide the given mass in grams by the molar mass to locate the range of moles. Multiply the number of moles via Avogadro's wide variety to attain the variety of atoms. There are 24 atoms in a single molecule of C6 H12 06. This chemical compound has 6 atoms of carbon, 12 atoms of hydrogen, and six atoms of oxygen. this is a total of 24 atoms.
The mole is the quantity of substance of a system that includes as many fundamental entities as there are atoms in zero. 012 kilogram of carbon 12 its symbol is mol To discover the number of moles in a sample, simply weigh it and divide the weight by way of the molecular weight. The quotient is equal to the variety of moles. The number of atoms or different particles in a mole is the same for all substances divided by the mass of the substance in grams via its molecular weight. this could provide you with the range of moles of that substance that are inside the targeted mass.
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2NH3 + H₂SO4 → (NH4)2SO4
Calculate the percentage atom economy to form the fertiliser ammonium sulphate in the above reaction
The percentage atom economy is 62%
2NH3 + H₂SO4 → (NH4)2SO4
34 gram 98 gram 210 gram
2 mol 1 mol 1 mol
% atom economy = mass of atoms in desired product/total mass of atom in Product x 100
% atom economy = 132/210 x 100 = 0.62 = 62%
What is Atom economy ?The amount of desirable useful products produced from reactants is measured by atom economy, also known as atom efficiency. It is frequently expressed as a percentage and is referred to as percentage atom economy. The required product atoms are divided by the total number of reactants, which is equal to the total number of product atoms, to determine the percent atom economy
Higher atom economy reactions provide more of the desired product while producing less waste.
The following stages can be used as a generic method to compute the atom economy:
Create a chemical equation for the reaction provided.Equilibrate the variables.Utilizing the periodic table's atomic and formula masses, determine the masses of the reactants and products. The total mass of the reactants on the left side and the total mass of the products on the right side are always equal in a correctly balanced equation.Determine the atom economy percentage.
Hence, percentage atom economy is 62%
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An increase in the concentrations of greenhouse gases in Earth’s atmosphere would have which of these effects on temperature?
An increase in the concentrations of greenhouse gases in Earth's atmosphere would cause an increase in the average temperatures on Earth's surface.
The greenhouse effect occurs when gases build up in the upper atmosphere of the Earth, where they absorb solar heat and trap it. Thus, the heat that ought to be fleeing into space is being held back on Earth. The following gases contribute to this effect:
Dioxide of CarbonMethaneNitrogen Oxidewith a ton more. However, the greenhouse effect is mostly caused by them. By retaining heat in the lower (rather than upper) atmosphere, this action will raise temperatures on the surface of the globe.
Heat from the sun would be trapped on Earth as the concentration of greenhouse gases (such the ones described) in the atmosphere increased, resulting in an increase in the global temperature.
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Calculate the formula mass of sodium sulfate decahydrate, Na2SO4⋅10H2O , in atomic mass units (amu or u).
Answer:
Na
2
SO
4
.10H
2
O
=(2×23)+32+(4×16)+(10×18)
=46+32+64+180
=322
Antifreeze has a density of 0.79 g/mL. What mass of antifreeze, in grams, is required to fill a 2.5
gallon car radiator?
Note: 1 gallon = 3.785
The mass of antifreeze required to fill a 2.5 gallon car radiator is
Since, 1 gallon = 3.785 L
2.5 gallon = 9.4625 L
Given,
Gasoline = 9.4625 L x 1000 mL/L
= 9462.5 mL
Density = 0.79 g/mL
Mass = Density x volume (density = mass )
Mass = 0.79 g/mL x 9462.5 mL volume
Mass = 7475.37 g
Therefore,
Mass of antifreeze, in grams = 7475.37 g
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Matter can change state when ______ energy is ______ into or out of the ______.
Fill in the blanks.
Thank you
Matter can change state when thermal energy is absorbed into or out of the body.
What energy is used to change the state of matter?Changing states of matter occur when matter loses or absorbs thermal energy. When a substance absorbs energy, the atoms and molecules move more fast which increases kinetic energy of the atoms that pushes particles far enough from each other which resulted in the change of form. This energy which changes the state of matter is the heat or thermal energy. We know that thermal energy increases kinetic energy so that's why the heat energy changes state of matter.
So we can conclude that Matter can change state when thermal energy is absorbed into or out of the body.
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Based on your reading you know that one elements on the periodic table are listed in order of their atomic numbers. If scientists didn't use that method, hypothesize another wav the periodic table could be organized in an orderly fashion. Write your answer below.
CAN YOU HELP ME RIGHT NOW PLEASE, THANKS YOU
An alternative method for the arrangement of elements is by the use of atomic masses of the elements.
What is the periodic table?The periodic table is an arrangement of elements based on increasing atomic number. This is what is called the modern periodic law. Before the advent of the current periodic table, there have been many other kinds of periodic table.
In the periodic table as it is now, there are about 118 elements that are arranged in groups and periods. The groups contain elements that are chemically similar and could react in the same way while the periods contain elements that have the same number of shells.
However, we know that an alternative method for the arrangement of elements is by the use of atomic masses of the elements. This was the method that was used arrange the old periodic table. However, this method did not account for periodic trends.
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What is the weighted average of a nail in the sample data given
Answer:
11.176
Explanation: