Answer:
3) Br-Br
Explanation:
Polarity occurs between Two atoms of unequal electronegativities.
since Br-Br contain only one atom ( ie.Bromine), they have equal electronegativity. So they can't be polar.
Molecules have Question 19 options: A) only potential energy. B) neither kinetic nor potential energy. C) only kinetic energy. D) both potential and kinetic energy.
Answer:
D
Explanation:
molecules have potential energy and kinetic energy.
Tempreture is defined as the average kinetic energy and internal energy is PE+KE. Pptential energy in particles or molecules is just there position relative to one another. A gas which has seperated particles will have a greater potential energy than a solid/liquid.
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 children's liquid medicine contains 100 mg of the active ingredient in 5 mL. If a child should receive 150 mg of the active ingredient, how many milliliters of the medicine should the child be given? For the purposes of this question, assume that these numbers are exact. The package states that one teaspoon (tsp) is approximately equal to 5 mL. Calculate the number of teaspoons that the child should receive. Use the given approximation as your conversion factor.
Answer:
Explanation: A children's liquid medicine contains 100 mg of the active ingredient in 5 mL . If a child should receive 150 mg of the active ingredient, how many milliliters
which element requires the least amount of energy to remove the outer-most electron from a gaseous atom i the groud state
The element that requires the least amount of energy to remove the outer-most electron from a gaseous atom in the groud state is Sodium (Na). That is option 3.
What is a ground state of an atom?A group state of an atom is defined as the level of energy attained by an atom in which all its electrons are in the lowest possible energy levels.
From the periodic table, the elements are arranged in groups and periods according to their atomic mass number.
From the atoms listed, sodium is element that requires the least amount of energy to remove the outer-most electron from a gaseous atom in the groud state.
This is so because of the following reasons:
It had very low nuclear charge, Small size, and A negligible shielding effect.Learn more about elements here:
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Complete question
Which Element Requires The Least Amount Of Energy To Remove The Most Loosely Held Electron From A Gaseous Atom In The Ground State?
(1) bromine
(2) calcium
(3) sodium
(4) Silver
What do we call the state of a neuron when it is not firing a neural impulse? (2 points) action potential resting potential myelination signal transmission impulse inhibitory stage
The correct option is B.
Resting potential is the state of a neuron when it is not firing a neural impulse.
Resting potential is considered as the imbalance of electrical charge which existed between electrically excitable neurons or nerve cells in the interior and in their surroundings.
The resting membrane potential of a particular cell defines as the difference in electrical potential across the plasma membrane as when the cell exists in a non-excited state. The electrical potential difference that takes place across a cell membrane traditionally is expressed inside the cell by its value which is relative to the extracellular environment
When the condition of not sending a signal by a neuron takes place, it is considered to be at the "rest" stage. When a neuron exists at rest position, the inside region of a neuron is negative with respect to the outside.
The potential is recorded whenever a living cell is impaled with a microelectrode and is termed as the resting potential and it varies from one cell to another cell. Here it is valued to be -60 mV, but the value can range between -80 mV and -40 mV which depends on the particular type of nerve cell existed.
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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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www 15. Using the idea of particles explain why: a. The smell of burnt food travels through the houses? b. When two solids are placed on top of each other, they do not mix? c. Pumping up your bike tyres gives a smooth ride? d. Smokers can cause lung damage in other people? e. Heating gas in a closed container will increase its pressure? f. Poisonous gasses from a factory chimney can affect a large area?explain it ?
a. The smell of burnt food travels through the houses- Because the particles are really heated up and have a lot of kinetic energy, which causes them to move quickly, the stench of burnt food permeates the entire house.
b. When two solids are placed on top of each other, they do not mix- Because they have clear boundaries and a definite shape, two solids stacked on top of one another do not mix.
c. Pumping up your bike tires gives a smooth ride- Because the tire's air pressure is what maintains it in place. Even though the tires appear to be firm when you push on them with your palm, they actually have a lot of give as the vehicle's weight shifts and it bounces around the road.
d. Smokers can cause lung damage in other people- The heart and blood arteries are impacted by secondhand smoke, which raises the risk of suffering a heart attack. The risk of developing and passing away from heart disease rises when people are exposed to secondhand smoke.
e. Heating gas in a closed container will increase its pressure- When gases in containers are heated, the average speed of their molecules increases. They consequently strike the container walls more frequently, more forcefully, and with greater force. Therefore, when the gas's temperature rises, it is under more pressure.
f. Poisonous gasses from a factory chimney can affect a large area- manufacturing chimney smoke, and power plant emissions all contribute to air pollution. Acids are created when poisonous gases, like sulfur dioxide, combine with rain and mist. A large area of plants are killed when acid rain occurs.
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______ is the amount of heat present a.energy b.temperature c.potential d.thermometer
Answer:
[tex]b[/tex]
[tex]temperature[/tex]
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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Using the dimensional Analysis
In the Above questions to convert 14,612 mL to DAL which of the following portrays to correct set up
Option A displays the accurate dimensional analysis for converting 14,612 mL to daL.
Determining the value of measurement across many units is crucial in many situations.This means that we must convert from one unit to another. The application of a conversion factor enables such a conversion.Now that we are aware of a conversion factor, we can utilize it to change mL into daL. In order for the units to cancel out, this conversion factor needs to be dimensionally precise in its arrangement.Option A displays the accurate dimensional analysis for converting 14,612 mL to daL.Learn more about unit conversion at:
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What are the main categories of properties of matter? Mark all that apply.
Physical
Chemical
Pure Substance
Mixture
Physical, chemical, pure substance, and mixture are all categories of properties of matter.
What is Matter?
The matter is defined as something that has mass and occupies space.On basis of physical state, the matter is classified into solid, liquid, or gas.On basis of chemical property, the matter is categorized as homogenous and heterogeneous.The matter is also categorized into pure substances and mixtures.Pure substances are further divided into elements and compounds.The matter is made up of specific chemical and physical properties called elements which are not further broken down.Therefore, physical, chemical, pure substances, and mixtures are the main categories of matter.
Hence, all the given options are correct.
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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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2. Note how many of each element would be found in one particle of the following compounds:
Compound
sugar (C12H22O11)
salt (NaCl)
baking soda (NaHCO3)
Number of Each Element
Sugar has 12 elements of carbon, 22 elements of hydrogen, and 11 elements of oxygen.
Salt has 1 element of sodium, and 1 chlorine
Baking soda has 1 sodium, 1 hydrogen, 1 carbon and 3 oxygen
What is an element?A chemical element is a substance that cannot be further broken down by any chemical reaction.
Each element has its own specified number of proton in their nuclei.
An element’s atoms must all have the same number of protons but they can have different numbers of neutrons and hence different masses.
Examples of elements include:
hydrogenheliumlithiumcarbonoxygenSome elements are more abundant that others in the universe. At 75 percent, hydrogen is the most abundant element in the universe, followed by helium at 23 percent, then oxygen at 1 percent.
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An epicenter station is4,000 km away. How long after the the first wave did the first wave arrive?
The first wave appear after 320 seconds and after the arrival of P wave
We can use the formula TD = d × t / 100 km
TD = d × t / 100 km
= ( 4000 km × 8 s ) / 100 km
= 32000 km /s / 100 km
= 320 seconds
The first s-wave will arrived in 320 seconds after the arrival of the first p-wave
The earliest waves to reach a seismograph are known as P waves, or primary waves. The fastest seismic waves, known as P waves, can pass through solid, liquid, or gas. On the medium they travel through, they leave a trail of compressions and rarefactions
The second waves to arrive during an earthquake are called S waves, or secondary waves. They can only pass through solids and are substantially slower than P waves
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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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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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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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Which of the following is the steepest slopeWhich statement about DNA is true?
Responses
Different people can have the same copy of DNA in their cells.
Different people can have the same copy of DNA in their cells.
DNA is made up of genes that carry hereditary information.
DNA is made up of genes that carry hereditary information.
DNA controls the genotype but not the phenotype of an organism.
DNA controls the genotype but not the phenotype of an organism.
DNA controls the genotype only in the second and third generations.
DNA is made up of genes that carry hereditary information
The molecule inside cells that contains the genetic information responsible for the development and function of an organism and DNA molecules allow this information to be passed from one generation to the next generation and a molecule that contains the biological instructions that make each species unique
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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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propane (c3h8) is burned with air. for each case, obtain the balanced reaction equation for complete combustion a. with the theoretical amount of air. b. with 20% excess air. c. with 20% excess air, but only 90% of the propane being con- sumed in the reaction.
Combustion of propane is the exothermic reaction
Combustion reactions are reactions in which a substance reacts with an excess of air or oxygen to form products. the combustion of hydrocarbons in the presence of stoichiometric or excess levels of oxygen forms carbon dioxide and water and with the release of heat the molecular formula of propane is C₃H₈. one mole of propane needs five moles of oxygen for complete oxidation to form carbon dioxide and water.
The balanced equation for combustion of propane is:
C₃H₈(g) + 5O₂(g)→3CO₂(g)+4H₂O(g)
The products are 3 moles of CO₂ and 4 moles of H₂O for every mole of the alkane burnt completely. propane combust completely
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Which of the following are used to make
predictions?
hypotheses
laws
theories
Answer:A hypothesis is a tentative explanation that can be tested by further investigation. A theory is a well-supported explanation of observations. A scientific law is a statement that summarizes the relationship between variables. An experiment is a controlled method of testing a hypothesis.
Explanation:
A large rainstorm hits your town, and it rains all day. how does this event relate to the water cycle, and what happens to the water after the rain storm? first, state which stage of the water cycle is demonstrated by the storm. next, use the remaining stages of the water cycle to explain what happens to the water as the water cycle is completed. remember that the stages of the water cycle include evaporation, precipitation, condensation, and runoff.
Answer: here is the answer, I tried. lol, remember to re-write it!
The first stage is where it rains into grass, water, anything. Then it goes into the air and into more clouds, and produce more rainfall, which is evaporation. After that, it goes into precipitation, where it can cause hair, mist, rain, or snow. Then condensation, where water collects droplets when there is humid air, into the clouds. Then runoff, where the water is transported to a new location to produce rainfall.
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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Conductivity is directly related to the number of ions present in a solution. Insoluble compounds do not dissociate to any appreciable extent. What kind of conductivity would you expect such a solution to have?.
An incompletely dissociating solution would have weak conductivity. Ions that have completely broken free from their bonding conduct more effectively than those that are still connected.
Why conductivity is important?Aquatic organisms and plants prefer a particular spectrum of salinities. Outside of this area, they will have negative effects and possibly even die. Others can endure both low and high salinities, whereas certain creatures can only endure low salinity.
In addition to its direct effects on aquatic life, salinity has various other important influences on the chemistry and density of water.
How is Conductivity measured?
The most popular way to quantify saltiness is in parts per thousand, or grams per liter.
A Siemen is a unit used to measure conductivity. It is also known by its smaller equivalents, the milli-Siemen and the micro-Siemen, which are each one millionth of a Siemen. The most popular type of conductivity is referred to as specific conductivity.
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identify what each ghs symbol signifies about the type of chemical present in a bottle or storage cabinet.
If this symbol is seen on a chemicals bottle, it means that it is an oxidizing chemical.
What is the symbol?
In a chemical laboratory there is usually a special cabinet for the storage of chemicals. The chemicals that are stored are often chemicals that are used to carry out one kind of experiment or the other in the laboratory.
However, symbols are used to symbolize the peculiarity of each particular chemical. Now we can see the symbol as shown in the image attached. If this symbol is seen on a chemicals bottle, it means that it is an oxidizing chemical.
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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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the pits in a cd are 1.6e-8 m deep. how many of these pits would need to be stacked on top of each other to make a hole .305 m deep?
Answer:
4.5 written in scientific notation is 4.5×100 4.5 × 10 0 .
The only exponent number that will produce 1 as the value of the number is 0.
Explanation:
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
- Why is the FBI interested in studying explosives?
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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