The above observation is made as follows:
There is a bird circling right above where we sit. It appears to be a hawk. It has circled round our location five time each time being at least 25 meters above the ground. It is to be noted that the weather as at this time is sunny. and it is about noon. After the fifth time, it swoops down at a terrific speed of about 80 miles per hour. Then it snatches a lizard off the ground and flies off to a tree which is about 50 yards from where we are. As it flies off, the sounds of the wings beating against the air can be heard faintly.
What is observation?Observation is the active gathering of information from primary sources. In living things, observation uses the senses. In science, observation can also involve capturing and recording data using scientific instruments.
Why is observation relevant in Science?Science relies heavily on observation. Scientists gather and record data through observation, which allows them to develop and test hypotheses and ideas.
Scientists observe in a variety of ways, using their own senses as well as instruments like microscopes, scanners, and transmitters to enhance their vision or hearing.
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Hydrologists are closely monitoring the health of a reservoir to determine if it will remain a suitable habitat for a rare species of fish. Which species would make the BEST bioindicator?
Responses
A Species C, a microbacterium that records show has lived in the reservoir for at least 70 years and can tolerate only slight variations in pH and dissolved oxygen levels.Species C, a microbacterium that records show has lived in the reservoir for at least 70 years and can tolerate only slight variations in pH and dissolved oxygen levels.
B Species A, a migratory bird which stops in the reservoir zone twice a year in great numbers.Species A, a migratory bird which stops in the reservoir zone twice a year in great numbers.
C Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures.Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures.
D Species D, a local hawk that lives in the reservoir zone year-round and preys upon some aquatic wildlife from the reservoir as well as many species from areas outside the reservoir zone.
The species that would make the BEST bioindicator is option C: Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures. Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures.
What are reservoir?Humans, animals, and the environment are known to be the constituent of reservoirs. The source from which an agent is moved to a host may or may not be is known to be the reservoir.
For instance, since the soil serves as the reservoir for Clostridium botulinum, such that canned food harboring C. botulinum spores is the main reason of botulism diseases.
Therefore, The species that would make the BEST bioindicator is option C: Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures. Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures.
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how many elements are in 3caso4
Answer:
there are only three elements in 3CaSO4: calcium, sulfur and oxygen
Which angle is complementary toE0D
Answer:
?
Explanation:
Is there supposed to be a picture or is that only 5he question?
I need help right now please
Answer:
Explanation:
It is A because the electrice flows through the cord to give energy for the blades to move.
2. Calculate the wavelength in nm of a photon with an energy of 2.57 x 10-19 J.
The calculated energy is 3.97×10⁻²¹J
A single photon has an energy of hv or = (h/2), where h is the Planck constant of 6.626 x 10-34 Joule-sec. If the photon's frequency is known, we may apply the formula E = h f to determine a photon's energy. The equation E = h c can be used to determine a photon's energy if its wavelength is known.
The photon has a 3.97 1021 J energy.
E=hf, with
Planck's constant is h, and the photon's frequency is f.
The second equation is f=c, where c is the speed of light and is the photon's wavelength.
F=c, so we can write
E=hcλ
=6.626×10⁻³⁴J⋅s×2.998×10⁸m⋅s⁻¹/5.00×10⁴×10⁻⁹
=3.97×10⁻²¹J
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Calcium chloride (a solid ionic salt formed from a group 2A metal and group 7A Halogen) is dissolved into a water solvent. Can the calcium chloride be separated from the solution, and will it retain its properties?
a
No, it cannot be separated through any means. It does not retain its original properties.
b
Yes, it can be separated through evaporation. It does not retain its original properties.
c
No, it cannot be separated through any means. It retains its original properties.
d
Yes, it can be separated through evaporation. It retains its original properties.
Answer:
Yes, it can be separated through evaporation. It retains its original properties.
Explanation:
how to separate bean from mixture without picking them out one by one
MATCH THE ANSWER TO SOLVE THE PH
1.
The pH of a solution with a [H3O+] = 7.5 x 10-4 M.
:
The pH of a solution with a [H3O+] = 7.5 x 10-4 M.
2.
The pH of a solution with a [H3O+] = 9.4 x 10-7 M.
:
The pH of a solution with a [H3O+] = 9.4 x 10-7 M.
3.
The pH of a solution with a [H3O+] = 3.7 x 10-14 M.
:
The pH of a solution with a [H3O+] = 3.7 x 10-14 M.
4.
The pH of a solution with a [H3O+] = 4.2 x 10-2 M.
:
The pH of a solution with a [H3O+] = 4.2 x 10-2 M.
a.pH = 2.6
b.pH = 4.9
c.pH= 1.4
d.pH= 3.1
e.pH = 14.6
f.pH = 8.0
g.pH = 13.4
h.pH = 6.0
The pH of a solution with a [H3O+] is 4.9 .Thus option (b) is true.
What is pH?pH is defined as negative log of H3O+ ion construction.
The pH can be calculated using formula:
pH = - log [H3O+].
[H3O+] = 7.5 x 10-4 M
pH = - log[7.5 x 10-4M]
pH = 4.9
The pH of a solution with a [H3O+] = 9.4 x 10-7 M = 2.6 = (a)
The pH of a solution with a [H3O+] = 3.7 x 10-14 M = 4.9 = (b)
The pH of a solution with a [H3O+] = 4.2 x 10-2 M = 2.6 = (a)
Thus, the pH of a solution with a [H3O+] is 4.9 .Thus option (b) is true.
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Water is homogeneous substance true or false
Answer: pure water is homogeneous and pure substance.
Explanation: However, when a homogeneous substance consists of two or more different types of molecules uniformly intermingled with one another, then it’s called a homogeneous mixture. A mixture’s composition can vary, but a pure substance does not.
Answer:
True
Explanation:
since the gases and minerals dissolved in water are in the same state as water and they do not form separate layers
What happens to the molecules that make up a as it is heated up in the oven?
6. 2074 Old Q.No. 20 2072 Q.No. 20 What is normality? How can you prepare sodium carbonate in 250 ml? 10 solution of sodium carbonate in 250 ml?
Answer: what is normality =
As per the standard definition, normality is described as the number of gram or mole equivalents of solute present in one liter of a solution. When we say equivalent, it is the number of moles of reactive units in a compound.
How can you prepare sodium carbonate in 250 ml?
Procedure
Take a watch glass, wash it with distilled water and dry it.
Weigh the exact amount of clean and dried watch glass and record its weight in the notebook.
Weigh correctly on the watch glass with 1.325 g of sodium carbonate and record this weight in the notebook.
Using a funnel, transfer sodium carbonate softly and carefully from the watch glass into a clean and dry measuring flask.
Wash the watch glass with distilled water to move the particles that stick to it into the foam with the assistance of a wash bottle.
For this purpose, the volume of distilled water should not exceed 50 ml.
Wash funnels several times with distilled water to move the sticking particles into the measuring flask using a wash bottle. Add water in tiny quantities while washing the funnel. The distilled water quantity used for this purpose should not exceed 50 mL.
Using a wash bottle, wash the funnel carefully with distilled water to pass the solution attached to the funnel into the measuring flask
Turn the flask of measurement until the sodium carbonate dissolves.
Using a wash bottle, thoroughly add enough distilled water to the measuring flask just below the etched mark on it.
Add the last few mL of distilled water drop into the measuring flask until the reduced meniscus level just touches the mark.
Put the stopper on the mouth of the flask and shake softly to make the entire solution uniform. Calculate it as a solution of sodium carbonate N/10.
10 solutions of sodium carbonate in 250 ml?
Normally in the laboratory, we are required to prepare 250 ml of solution. Therefore, to prepare 250 ml of \frac{M}{10} Na2CO3 solution, \frac{10.6}{4} = 2.650 g of sodium carbonate are dissolved in lesser quantity of water and the solution is diluted to exactly 250 ml
Explanation:
B
1
2
3
4
5
sodium (Na)
boron (B)
O magnesium (Mg)
lithium (Li)
6
7
8
9
10
An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron
than beryllium. Which element is element X?
Save and Exit
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Sodium has three shells while beryllium has two shells. Beryllium has one more valence electron compared to sodium.
Valence electron are the electrons present in outer most shell of the atom Atomic number of beryllium is 4 and its electronic distribution is 2,2. this indicates there are 2 electrons in outermost shell Atomic number of sodium is 11 and its electronic distribution is 2,8,1.This indicates there is 1 electron in outermost shell.Beryllium is found in period 2 of group 2 of the periodic table, which is also known as the alkaline earth metal group. Sodium is found in period 3 of group 1 of periodic table,also called alkaline earth metal group. Thus ,sodium has one less valence electron in outermost shell as compared to berylliumLearn more about valence electron here-
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Gold has an atomic mass of 197.0 grams per mole. How many moles of gold is 10 grams? How many gold atoms are found in 10 grams of gold?
Oxygen has six electrons in its outer shell. How many electrons do you predict sulfur, selenium, tellurium and polonium will have in their outer shell? Why?
The number of electrons for sulfur, selenium, tellurium, and polonium will have in their outer shell is 6,6,6,6 respectively.
The electronic configuration of an element depicts the number of electrons in the outermost shell.Oxygen has six electrons which are for the configuration 1s22s22p4Similarly sulfur has the electronic configuration as [Ne]3s23p4So the number of outer shell electrons is 6Similarly, selenium has 34 atomic number, and electrons is 2,8,18,6 so the outer shell electrons is 6The number of valence electrons of tellurium is 6 as the electronic configuration is 2,8,18,18,6The number of valence electrons is 6The electronic configuration of polonium is 2,8,18,32,18,6So the outer shell electrons is 6To learn more about the outermost shell visit:
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Mercury has a density of 13.6 g/mL. What is
the mass in pounds of 556 mL of mercury?
Answer: 16.7 pounds of mercury
Explanation:
556 mL * 13.6 g/mL=
556 mL * 13.6 g/1 mL=
556 * 13.6/1=
556*13.6=
7561.6 g=
7561.6 g * 1 pound/453.592 g= ==> 1 pound=453.592 grams
7561.6 * 1/453.592=
7561.6/453.592=
16.67=16.7 pounds of mercury
The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition. The mass in pounds of mercury is 16.635 pounds.
The term "density" refers to the ratio between the volume (the amount of space an object or substance occupies) and the mass (the quantity of material it contains). Density can also be defined as the quantity of mass per unit of volume. A dense object is one that is both hefty and small.
Density is the measure of an object's mass per unit volume. Kilograms per cubic meter (kg/m³) is the SI unit for density.
Density = Mass / Volume
13.6 g/mL = (m) / (556 mL)
m = 13.6 g/mL × 556 mL
m = 7561.6 g
1 g = 0.0022 pound
7561.6 g = 16.635 pounds
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How long will it take a car to accelerate from 30 m/s to 60 m/s, if it’s accelerating at 5 m/s 2
Answer:
6 metres per second squared
Explanation:
Gain in velocity = 60 - 30 = 30 m/s.
Time taken for this gain = 5 seconds
Average acceleration = 30 / 5 = 6 m/s/s.
So, 6 metres per second squared.
What is the name of this lab equipment
The name of the lab equipment is bunsen burner.
What is a bunsen burner?A bunsen burner is a piece of equipment found in many laboratories primarily used for the controlled burning of flammable gas in the air.
In the laboratory, the bunsen burner is used as a source of heating for reactions. The gas-air mixture can be controlled to determine the level of flame and heat that will be produced.
Bunsen burners can vary in structure depending on the maker. The gas supply can be any of butane, propane, etc.
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Use
the periodic table to choose the element that matches each description.
halogen
group IIA:
A
nonreactive:
alkali metal:
DONE
Halogens are p-block elements, group IIA & alkali metal belongs to s-block and nonreactive elements are known as noble gases.
What is the periodic table?Chemical elements are listed on a periodic table according to their atomic number. Carbon and oxygen are two of the chemical elements listed in the periodic table.
What are the main features of the periodic table?The Periodic Table groups the elements according to their linked chemical and physical properties. The table consists of rows and columns. Vertical columns of the periodic chart represent groups. The table displays periods as horizontal rows.
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6. CCC Patterns Compare the ions of elements listed in the table with the atoms of
the element. Based on the patterns in their particle compositions and charges,
write a definition for "ion."
CCC Pattern compare the ions of elements listed in the table with the atoms of the element. Based on the patterns in their particle compositions and charges, the definition of ion would be that CCC pattern compare ions of elements.
An ion is a structure in crystal system having regular repeating arrangement, which can be called as an ionic lattice.
Lattice is formed because ions attract each other and form a regular pattern with oppositely charged ion next to each other.
An atom is the smallest unit of an element that retains the chemical properties of element. Every atom includes a nucleus, generally containing both positively charged particles called ions and uncharged particles called ion.
In the space surrounding, the nucleus are negatively charged particles called electron.
Therefore, ions are oppositely charged particles in lattice.
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Choose your favorite element. Complete the blank periodic table entry for that element to the left. Research your element and write one interesting fact you discovered below
CAN YOU HELP ME, PLESE RIGHT NOW
Sodium is a metal that belongs to group 1 of the periodic table.
What is my favorite element?My favorite element is sodium. Sodium is found in group one of the periodic table. The element is univalent and also forms univalent positive ions. Like every other metal, sodium is able to react with dilute acids to liberate hydrogen gas.
Sodium is a light metal and is known to react with mercury to form the sodium mercury amalgam which is obtained during the electrolysis of sodium chloride. All of the compounds that are formed by sodium are ionic in nature. However the hydrides of sodium are unstable.
Sodium is highly reactive thus it must not be exposed to air since it could ignite spontaneously in air. As such, sodium must be stored under paraffin oil. All the compounds of sodium are ionic in nature.
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What is the atomic weight of gold ?
Answer:
the atomic weight of mass is 196.96657 u
Indicate the type of observation that is best represented by the figures below.
Identifying Types of Observations
qualitative
quantitative
Identifying Types of Observations
qualitative
quantitative
Identifying Types of Observations
qualitative
quantitative
The observation shown in the image is qualitative.
Chemical analysis will be; Qualitative
Quantitative :In a qualitative chemical analysis, we can determine the components of a substance. In a quantitative analysis, we want to determine the amount of every of the components of a substance. Both sorts of analysis are of very much important in chemistry.
From the image, we could observe a change in color . Qualitative analysis might be carried out by the use of chemical reagents which could give positive tests like as change in color to show the presence or absence of some constituents of a given substance.
Qualitative :Qualitative analysis provides the details of the presence or nonappearance of different chemical components in a unknown sample. Qualitative chemical analysis, deals with the branch of chemistry identification of elements or grouping of elements provided in a sample. This techniques employed in qualitative analysis vary in complexity, depending on the nature of the sample
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what is the mass of 3.2 mL of a liquid with specific gravity of 0.986?
The mass of 3.2 mL of a liquid with specific gravity of 0.986 is 3.155 g
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 determine the mass of the liquid. Details below
How to determine the mass of the liquidThe following data were obtained from the question:
Volume of liquid = 3.2 mLDensity of liquid = 0.986 g/mLMass of liquid =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of liquid = 0.986 × 3.2
Mass of liquid = 3.155 g
Thus, the mass of the liquid is 3.155 g
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Choose the combination of factors that creates a thunderstorm
Relative Humidity
Low or high?
Air Temperature
Cold or warm?
Air Pressure
Low or high ?
Helpppp
Answer:
High humidity
Warm
High Pressure.
Answer:
Relative Humidity: high
Air Temperature: warm
Air Pressure: low
Write orbital diagrams for each ion. Determine if the ion is diamagnetic or paramagnetic. Cd2+
The orbital diagram is shown below ,
The [tex]Cd^{+2}[/tex] ion is diamagnetic .
The Atomic number of Cd = 48
Electronic configuration of Cd is is [tex]1s^{2} 2s^{2}2p^{6} 3s^{2} 3p^{6} 3d^{10} 4p^{6} 4d^{10}5s^{2}[/tex] .
After the removing two electrons from Cd , Cd gets two positive charges and becomes [tex]Cd^{+2}[/tex] .
The electronic configuration of [tex]Cd^{+2}[/tex] is [tex]1s^{2} 2s^{2}2p^{6} 3s^{2} 3p^{6} 3d^{10} 4p^{6} 4d^{10}[/tex] .
The [tex]Cd^{+2}[/tex] has no unpaired electron . Hence , it is diamagnetic in nature .
The orbital diagram of is shown as follows,
The shell structure of a cadmium atom, which has 48 electrons, is 2.8. 18.18.2. Ground state gaseous neutral cadmium has the electron configuration [Kr] in its ground state.
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Which of the following statements is TRUE?
A sodium (Na) atom has a larger radius than a potassium (K) atom.
A neon (Ne) atom has a smaller radius than an oxygen (O) atom.
A fluorine (F) atom has a smaller first ionization energy than oxygen (O) atom.
None of the statements are true.
pls explain the correct answer. i have to explain why its correct
Explanation:
hi I am not sure if you have any questions or concerns please visit the plug-in settings to try and you have any questions or concerns please visit
What temperature does Sulfur freeze at
Answer:
115.21 degrees Celsius
a.
Neutrons have a neutral charge, a mass of 1 amu, and are found in an atom's ______
b.
Protons are a little smaller than neutrons, they still have a mass of 1 amu though. They are found inside an atom's nucleus and carry a
_______ charge.
C.
Electrons almost have no mass, it's so small we say it is 0 amu. They sail around the nucleus in the _______ They have a ______
charge.
Neutrons have a neutral charge, a mass of 1 amu, and are found in an atom's Nucleus , Protons are a little smaller than neutrons, they still have a mass of 1 amu though. They are found inside an atom's nucleus and carry a positive charge, Electrons almost have no mass, it's so small we say it is 0 amu. They sail around the nucleus in the orbit, They have a negative charge
Atoms of all elements except for most atoms of hydrogen have neutrons in their nucleus unlike protons and electrons, which are electrically charged, neutrons have no charge they are electrically neutral. that's why the neutrons in the diagram above are labeled n⁰ and the zero stand for zero charge neutron has a neutral charge
Protons are found in the nucleus of the atom and this is a tiny, dense region at the center of the atom protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit proton carry positive charge in the nucleus of atom
Electrons are one of three main types of particles that make up atoms and protons and neutrons, which consist of smaller, simpler particles, electrons are fundamental particles that do not consist of smaller particles electron has 0 amu and they have negative charge around the nucleus in the in the orbit called electron
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20 POINTS
A certain intermolecular force is created when a cation or an anion comes in contact with a neutral molecule that has dipole. What best explains the strength of this intermolecular force?
Strong, because it is a result of interactions between polar covalent molecules.
Strong, because it is a result of interaction between ions and polarized molecules.
Negligible, because it is a result of interactions between molecules with instantaneous dipoles.
Negligible, because it is a result of interactions between symmetrical molecules causing cancelling of dipoles.
The strength of this intermolecular force will be Strong, because it is a result of interaction between ions and polarized molecules.
This contact will produce a very powerful electric force.The force between two charged particles is known as the electric force. This power can either be alluring or repellent.Coulomb's law, which was determined from experimental data, governs the interaction between two stationary charged particles.According to Coulomb's law, the electric force between two point particles is inversely proportional to the square of the distance between them and is proportional to their charges. This force resembles Newton's gravitational force, which is likewise governed by the inverse-square rule, in many ways. But unlike gravitational force, which is always attracting, electric force may be both attractive and repulsive.To know more about electric force visit : https://brainly.com/question/2526815
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A light green powder is
heated in a test tube. A gas is given off while
the solid becomes black. What type of change is
occurring? Explain your reasoning.
The sample is undergoing chemical change.
When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical change.
There are five signs that shows us that the object is undergoing chemical change-
1. Change of colour
2. Change of temperature
3. Gas evolution
4. Precipitate formation
5. Production of smell
Therefore According to the given question the sample is giving off a solid precipitate of black colour. Also, there is evolution of gas so the given sample is undergoing a chemical change.
Additionally, this is a type of Decomposition reaction where in the gas evolved is a Carbon dioxide. Also the given sample is a Compound because two products are formed.
Hence, it is a chemical change.
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