Three groups of students are given study outlines for 6 weeks. one group studies 2 hours a night, a second group studies 1 hour a night, and the third group only studies 30 minutes. their final exam grade will be at the end of the 6 weeks. whats the independent variable
Here independent variable is Time spent on studying.
An eye tracking experiment must include variables. Anything that may vary or be altered is a variable. To put it another way, it refers to any variable that can be altered, taken into account, or measured in an experiment.Independent variable: These are the variables or circumstances that you control in an experiment. the dependent variable is directly impacted by this variable.In this case group of students can change their duration of time which they spent on studying. it could be 1 hour a night, 4 hour a night or anything therefore time spent on studying is independent variable.
Time they spent on studying will directly affect their final exam grade at the end of the 6 weeks therefore final exam grade is dependent variable.
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a material that has more than one set of properties
Answer:
heterogeneous mixture
Explanation:
the particles of each substance can be seen and the mixture has more than one set of properties.
Pleaseeeeeee help meeee
Answer:
2
1
2
3
3
1
Explanation:
In the first law, an object will not change its motion unless a force acts on it.
This is exactly how it worked in the (Last one). There is no movement with no force. The Second one seems a bit strange, but it's been known that inertia is the same as the first law. Why is that? Because there is no force acting on the water but there is some force acting on the glass.
In the second law, the force on an object is equal to its mass times its acceleration.
(First one& Third One) Increasing mass means increasing the force to accelerate with the same magnitude
In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction
The Fifth one. The combustion of the fuel produce force which is greater than the gravititional force acting on the rock. Therefore, a force has a reaction force which accelerates the rock upwards.
The Fourth is pretty much the same. A force of inertia acting as the reaction force here which refuses to move with the paper.
If you didn't get what i mean in any of those please let me know
In this experiment you are going to use 100. Mg of sodium borohydride. How many moles of sodium borohydride will you use?.
0.00264 moles of sodium borohydride will be used.
m(NaBH₄) = 100 mg ÷ 1000 mg/g
m(NaBH₄) = 0.1 g; mass of sodium borohydride
M(NaBH₄) = 37.83 g/mol; molar mass of sodium borohydride
n(NaBH₄) = m(NaBH₄) ÷ M(NaBH₄)
n(NaBH₄) = 0.1 g ÷ 37.83 g/mol
n(NaBH₄) = 0.00264 mol; amount of sodium borohydride
Sodium borohydride is white solid and it is a reducing agent.
Sodium tetrahydridoborate is an inorganic compound with the formula NaBH₄.
Mass is a fundamental measure of the amount of matter in the object.
Kilogram (symbol: kg) is the base unit of mass in the International System of Units.
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during a gravimetric analysis experiment to determine the salt (nacl) content of a chicken soup sample, a precipitate of silver chloride was produced, dried and weighed. the sources of error in the analysis include
Some precipitate remained in the reaction flask after the filtration process, which is one of the sources of mistake in the analysis.
Where is the use of gravimetric analysis?Gravimetric analysis has several practical applications, such as monitoring lead concentrations in drinking water, which, if left unchecked, could result in lead poisoning and even death.
How does a gravimetric analysis work?After the sample has been dissolved, the stages necessary for gravimetric analysis are as follows: solution preparation, precipitation, digestion, filtration, washing, drying or igniting, weighing, and finally calculation.
The principle of gravitational analysis:The idea underlying gravimetric analysis is that it is possible to determine the mass of an ion in a pure substance. The mass percent of the same ion in a known quantity of an impure chemical is later determined using this method.learn more about gravimetric analysis here
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the question you are looking for is
During a gravimetric analysis experiment to determine the salt (NaCl) content of a chicken soup sample, a precipitate of silver chloride was produced, dried and weighed. The sources of error in the analysis include
I)The precipitate was not washed before it was dried.
II)The soup contained some sodium iodide in addition to the sodium chloride.
III)Some precipitate remained in the reaction flask after the filtration process.
Which of these errors could account for a lower than expected mass of silver chloride precipitate?
what do you think will happen to the temperature if you use 75 ml of hcl and 75 ml of naoh instead of the 50 ml each that you used in experiment 1?
The thing that will happen to the temperature if you use 75 ml of HCl and 75 ml of NaOH instead is that it increases as more heat is released.
How to explain the reaction?A neutralization occurs when NaOH and HCl are combined. Each chemical reaction has a unique heat of reaction, which is the heat exchanged during the process.
The reaction in issue is exothermic (emits heat), and the amount of heat emitted relies on the chemicals used, their concentrations, and the working temperature (it is produced at a low temperature).
The fluctuation in temperature and the mass used determine how much heat is allocated.
In this case, the thing that will happen to the temperature if you use 75 ml of HCl and 75 ml of NaOH instead is that it increases as more heat is released.
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why is baking soda used in soda acid fire extinguisher?
Answer:
Explanation:
because seems it has a chemical that can remove fire they added it on a fire extinguisher
Answer:
Explanation:
why is baking soda used as acid fire extinguisher? Carbon dioxide gas is neither combustible nor helps combustion. It is heavier than air and cuts off the supply of oxygen from air and hence extinguishes the fire. … Hence, sodium bicarbonate is used in fire extinguishers.
the general molecular formula for alkanes is cnh2n 2. what is the general molecular formula for cycloalkanes? click in the answer box to activate the palette.
The cycloalkanes have the general formula CnH2n, where n is the number of carbons.
The carbon atoms of cyclic hydrocarbons, such as cycloalkanes, are organized in the shape of a ring. Additionally saturated, cycloalkanes have single bonds between all of the carbon atoms that make up the ring (no double or triple bonds). Additionally, there are polycyclic alkanes, which are compounds made up of two or more cycloalkanes linked together to form numerous rings.Cycloalkane naming adheres to a straightforward set of guidelines that are based on the same fundamental procedures used to name alkanes. The prefix "cyclo-" is used to identify cyclic hydrocarbons.Numerous organic molecules, referred to as cycloalkanes, can be found in nature or made in a lab and include rings of carbon atoms with distinctive chemical properties.Therefore, the general formula for cycloalkanes is CnH2n.
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Select all of the objects that (essentially) maintain a constant velocity.
A planet in orbit around a star
A hockey puck sliding on the ice
An apple sitting on a table
A baseball after being hit by a bat
Answer: baseball after being hit by a bat planet in orbit around a starExplanation:
If a hydrolysis reaction forms a carboxylic acid from an ester and water, what type of molecule will the other product be?.
If a hydrolysis reaction forms a carboxylic acid from an ester and water, the other product will be an alcohol.
Hydrolysis breaks down compounds by adding a water molecule.
Hydrolysis is a reaction that breaks down the chemical bonds between molecules via the addition of a water molecule.
Hydrolysis of an ester gives an alcohol and a carboxylic acid:
R-COOR + H₂O ⇄ R-COOH + R-OH
R-COOR is general molecular formula of an ester.
H₂O is water.
R-COOH is general molecular formula of a carboxylic acid.
R-OH is general molecular formula of an alcohol.
An ester is a compound in which at least one hydroxyl group is replaced by an alkoxy group.
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which metal is best for making metal canister
Answer:
Are there any answer choices? There are many options: stainless steel, aluminum, etc.
Explanation:
How do i find the charge?
Answer:
An easy way to work out the charge of an atom is to look at the periodic table. Elements on the left side of the table usually become positively charged ions and elements on the right side of the table typically have a negative charge. However, you can use a scientific formula to determine the formal charge of an atom.
Explanation:
a strong acid like hcl . group of answer choices is a strong buffer at low ph dissociates completely in an aqueous solution dissociates completely in aqueous solutions and is a strong buffer at low ph increases the ph when added to an aqueous solution reacts with strong bases to create a buffered solution
A strong acid like hcl dissociates completely in an aqueous solution
Acid :A Brnsted-Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or establish a covalent bond with an electron pair. Proton donors, also known as Brnsted-Lowry acids, are the first class of acids.
What is an acid and what does it do?LSD, sometimes known as acid, is the chemical name for lysergic acid diethylamide. Given that it's a potent psychedelic, you run the risk of seeing things and reality differently if you use it. Tripping is the term used to describe the LSD experience. Acidic substances fall below 7.0, while alkaline or basic substances rise above 7.0.
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TASK 3:
Figure 2 shows the chemicals given to a student.
Figure 2
W
Four different powdered metals
X
Y
Z
Dilute
sulfuric
acid
The student wants to investigate the reactivity of the four metals.
Outline a plan the student could use to investigate the relative reactivity of the four
metals, W, X, Y and Z
The plan should use the fact that all four metals react exothermically with dilute
sulfuric acid.
You should name the apparatus used and comment on the safe use of the
chemicals
_(6)
The apparatus used are dewer vessel 1000ml capacity complete with cover, electric stirrer 300rpm, base with stand, and W = zinc, X = aluminium, Y = magnesium, Z = iron and metals reactivity is chart listing metals in order of decreasing reactivity
Here given data is Four different powdered metals W,X,Y, Z react with Dilute sulfuric acid
When W=zinc, X=aluminium, Y=magnesium, Z=iron this four metals are reactive with Dilute sulfuric acid then give ZnSO₄, Al₂(SO)₃, MgSO₄, FeSO₄ and magnesium is very active metal and gold and platinum are not react with Dilute sulfuric acid and apparatus used are dewer vessel 1000ml capacity complete with cover, electric stirrer 300rpm, base with stand
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tris (short for tris-(hydroxymethyl)aminomethane) is a commonly used buffer for biochemical solutions. it contains an ionizable amino group with pka
200ml of 0.1M tris-H with 732ml water and 68ml of 0.1M NaOH
What is the purpose of tris hydroxymethyl aminomethane?The Food and Drug Administration has approved THAM, a rarely used buffer, for the treatment of metabolic acidosis related to cardiac bypass surgery and metabolic acidosis related to cardiac arrest.
What use does Tris buffer serve?For DNA agarose electrophoresis, Tris buffers are frequently employed. TBE (Tris borate/EDTA) and TAE (Tris acetate/EDTA) are the two major buffers. These Tris buffers can normally be used interchangeably, despite some variations in the resolution of various types of DNA and their mobility during electrophoresis.Using a tris buffer helps keep the pH steady during cell lysis and extraction because DNA extraction is a pH-sensitive procedure.learn more about buffer here
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the question you are looking for is
Tris-hydroxymethyl aminomethane (TRIS) is widely used for the preparation of buffers in biochemical research. Shown here is the structure of TRIS in its protonated form: Its acid dissociation constant, pKa, is 8.32 x10-9 M. You have available at your lab bench a 0.1 M solution of TRIS in its protonated form, 0.1 Msolutions of HCl and NaOH, and ample distilled water. Describe the preparation of a 1 L solution of 0.02 M TRIS buffer, pH 7.8.
a research chemist is trying to create a new plastic to be used as a food container that is more durable and lighter than glass, and so cheaper to transport. this is an example of research chemistry that
A research chemist is trying to create a new plastic to be used as a food container that is more durable and lighter than glass, and so cheaper to transport which is an example of research chemistry that benefits the environment.
What is Environment?
This is referred to as the physical surrounding or conditions in which an organism lives and contains living and non-living components which have various forms of influence on human life.
Plastic is a substance which is hard to decompose and takes many years and also has the tendency to release harmful chemicals into the environment. The creation of one which more durable and easier to transport means there will be less plastic wastes.
This will therefore reduce various forms of pollution and benefit the environment at large and is therefore the reason why it was chosen ad the correct choice.
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making new compunds for high-speed tires is best done by the
A. physical chemist
B. organic chemist
C. inorganic chemist
D. biochemist
Making new compounds for high-speed tires is best done by the physical chemist
Chemical compounds are made up of atoms of different elements, joined together by chemical bonds and a chemical synthesis usually involves the breaking of existing bonds and the formation of new ones and physical chemists aim to develop a fundamental understanding at the molecular and atomic level of how materials behave and how chemical reactions occur, knowledge that is relevant in nearly every area of chemistry
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Can anyone please explain how to use the formula for the given question with work shown
.53 micrometers
take away the zeros and decimal it
A rock will scratch with a fingernail but not a copper penny. According to mohs hardness scale, what can the student determine about the rock?
A rock will scratch with a fingernail but not a copper penny then according to Mohs hardness scale, the student will determine that the rock is more harder than fingernail and copper penny.
What is Mohs hardness scale?Mohs hardness scale can be defined as a qualitative ordinal scale ranges from one to ten characterizing the scratch resistance of various minerals through the ability of harder material to the softer material.
Hardness can be defined as the measure of the material resistance to localized permanent deformation. Permanent deformation is also known as plastic deformation.
Thus, rock will scratch with a fingernail but not a copper penny then according to Mohs hardness scale, the student will determine that the rock is more harder than fingernail and copper penny.
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Suppose that you are doing a lab in which you are observing prepared slides under the microscope. List the numbers of all the lab rules that would directly apply to this situation
The the numbers of all the lab rules that would directly apply to this situation are discussed below.
What is a microscope?A microscope is a laboratory equipment that is made up of lens which helps to magnify an object under investigation for study and observations.
A prepared slide is a slide that has undergone different staining procedures and is ready to be view under the microscope.
To make an efficient use of a microscope, the following laboratory rules needs to be followed:
Always dress appropriately when in the lad with your personal protecting equipments such as the eye goggles, gloves and a face mask.View all stained slides with X100 oil immersion.Focus all stained slides with X10 at the start.All prepared slides should be kept in a slide rack to prevent it from breaking.Learn more about microscope here:
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take two carbon atoms and join by two springs making a double bond. complete the ethene moleeule by adding two hydrogen atoms to each carbon atom. each carbon atom should now have the usual four bonds. this is ethene which is also called ethylene. the structure for ethene is
Ethene (H2C=CH2) is a gaseous by-product of the long-chain hydrocarbons that are cracked to create highly sought-after goods like gasoline and aviation fuels.
What is ethene used for?The uses of ethene include: It is employed in the creation of polythene. It is used to make fruits artificially ripe. Ethene is also utilised to create other beneficial molecules such ethanol, oxyethylene flame, and ethylene glycol, which is used as an antifreeze.Does ethylene resemble ethene?A substance having the chemical formula C2H4 is ethylene, commonly known as ethene. It is both the most easily manufactured organic compound in the world and the simplest alkene. Unsaturated hydrocarbon ethylene, often known as C2H4, is utilised in industrial facilities and is occasionally found in typical medicine cabinets as a hormone.learn more about Ethene here
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An element has two isotopes. one isotope has a relative abundance of 75.0% and mass 25.0 amu. the second isotope has a relative abundance of 25.0% and 28.0 amu. what is the average atomic mass of the element?
The average atomic mass of the element is 25.75 amu.
m(²⁵X) = 25.0 amu; the average atomic mass of isotope-25
m(²⁸X) = 28.0 amu; the average atomic mass of isotope-28
ω(²⁵X) = 75.0% ÷ 100%
ω(²⁵X) = 0.750; fractional abudance of isotope-25
ω(²⁸X) = 25.0% ÷ 100%
ω(²⁸X) = 0.250; fractional abudance of isotope-28
m(X) = m(²⁵X) × ω(²⁵X) + m(²⁸X) × ω(²⁸X).
m(X) = 25.0 amu × 0.750 + 28.0 amu × 0.250
m(X) = 25.75 amu; average atomic mass of an element
The unified atomic mass unit (amu) is a standard unit of atom.
Isotopes are chemical elements with same atomic number, but different atomic mass (different number of neutrons).
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how is copper obtained and separated from other nearby substances
Answer:
Explanation:
Copper mining is usually performed using open-pit mining, in which a series of stepped benches are dug deeper and deeper into the earth over time. To remove the ore, boring machinery is used to drill holes into the hard rock, and explosives are inserted into the drill holes to blast and break the rock.
1. The physician ordered Azithromycin 15 mg/kg IV star for a child who weighs 20.0 kg. How many mg would the pharmacist need to put in the IV bag?
2. Morphine sulfate is used for pain relief but can also become addicting and fatal. The physician order reads: Morphine sulfate 0.30 mg IM ( intramuscular) stat. The recommended dose is 0.01 mg/kg. Is the ordered dose a mg safe for a child who weighs 31.0 kg?
1. The pharmacist would need to put 300 mg of Azithromycin in the IV bag for the child.
2. The ordered dose of Morphine sulfate is safe for the child as 0.30 mg is slightly lower than 0.31 mg.
1. Azithromycin dosage for a child who weighs 20.0 kg:
The physician ordered Azithromycin at a dose of 15 mg/kg IV (intravenous) star.
Weight of the child (W) = 20.0 kg
Amount of Azithromycin needed = Weight of the child × Dose per kg
= 20.0 kg × 15 mg/kg
= 300 mg
Thus, the pharmacist need to put 300 mg of Azithromycin.
2. Morphine sulfate dosage for a child who weighs 31.0 kg:
The physician ordered Morphine sulfate at a dose of 0.30 mg IM (intramuscular) stat.
Weight of the child (W) = 31.0 kg
Recommended dose of Morphine sulfate = 0.01 mg/kg
= 0.01 mg/kg × 31.0 kg
= 0.31 mg
The ordered dose of 0.30 mg is slightly lower than the recommended dose of 0.31 mg for a child who weighs 31.0 kg.
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Periodic Table Project: Element Presentation Your Favorite Element Student Guide Assignment Prompt In this assignment, you will research an element of your choice from the periodic table. Using reference materials and Internet sites, you will collect information about the element.
The element from the periodic table which is choose is Hydrogen.
Behaviour of hydrogen atom as electronegative atomHydrogen behaves as electronegative atom when it combine with the elements of group 1 and group 2. Since, hydrogen have the capability to accept an electron to acquire stable noble gas electronic configuration like helium.
Behaviour of hydrogen atom as electropositive atomHydrogen behaves as electropositive atom when it combine with the elements of group 13, 14, 15, 16 and group 17. Since, hydrogen have the capability to lose an electron to acquire stable noble gas electronic configuration.
Thus, from. above we concluded that hydrogen have unique property rather than another elements. So, it is best suited for assignment project.
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what element makes baking powder so reactive when it touches coke
Answer: El polvo de hornear obtiene su energía de una reacción química que produce burbujas de aire, mientras que la levadura es un organismo vivo real que produce de gas a partir de una reacción biológica. Los dos procesos no son similares, y tampoco son intercambiables en las recetas.
Baking powder gets its energy from a chemical reaction that produces air bubbles, while yeast is an actual living organism that produces gas from a biological reaction. The two processes are also not similar and are interchangeable in recipes.
Explanation:
why do meteorologists study air pressure
Explain how gallium and germanium fit in Mendeleev’s predictions
Mendeleev left gaps in the periodic table to place elements not known at that time. By looking at the chemical properties and physical properties of the elements next to a gap, he predicted the properties of these undiscovered elements.
What is Mendeleev periodic table ? Based on the gaps in the periodic table Mendeleev deduced that in these gaps elements were yet to be discovered. Based on other elements in same group he predicted the existence of eka-aluminum, eka-boron, and eka-silicon, later to be named gallium (Ga), scandium (Sc), and germanium (Ge) respectively.eka-aluminum ⇒ gallium (Ga)eka-boron ⇒ scandium (Sc)eka-silicon ⇒ germanium (Ge)Thus we can conclude that, the chemical and physical properties of the elements next to the gap, he was able to predict gallium and germanium.
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In 1871, the atomic masses and other chemical characteristics of gallium, germanium, and scandium were unknown, but Mendeleev provided slots for each and made predictions about them.
Mendeleev's PredictionsMendeleev became so certain of the validity of his periodic table that he altered the atomic masses of known elements to make them fit where they "belonged" in it. He did this on the basis of his belief in his table alone, not any experimental evidence. In one instance, he adjusted the beryllium atomic mass from 14, which put it in Group 15 above nitrogen (N), to 9, which moved it below nitrogen. It was positioned in Group 2 above magnesium (Mg), with which it shared a closer chemical relationship. Mendeleev's bold prediction of the properties of as-yet-undiscovered elements was even more audacious.To learn more about Mendeleev's Predictions refer:
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please answer these questions. im sure im wrong on all them!!!!! please answer correctly too
Answer:
the graph shows that the filtrated solution was acidic but when we add nh3 (base) ,acid base reaction take place and in this reaction salt and water are form by this oh-ion concentration keep on increasing and change ph from 4 to 10
Mallory discovered that Fluorine (F) is found in Group 17, Period 2 on the periodic table. Where should Mallory look to find another element that has similar
properties to those of Fluorine?
O on the opposite side of the periodic table
O at elements whose symbols begin with the letter F
O in Period 2
O in Group 17
Answer:
I think in period 2
Explanation:
Mallory should look to find another element that has similar properties to those of Fluorine in Group 17 and is denoted as option D.
What is a Periodic table?This is defined as the arrangement of elements based on their atomic number in a tabular form. It consists of 18 vertical columns which are referred to as groups and seven horizontal rows called period.
Group 17 contains halogens such as fluorine, iodine etc and they have similar properties which is therefore the reason why it should be looked at for another element in this type of scenario.
This is also the most appropriate choice is option D.
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