Answers
Answer:
a
Explanation:
i took test
Related Questions
A student states that a graduated cylinder contains 150 mL of water the statement is
Answers
Answer:
Explanation:
An Observation
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which method is used to separate salt form salt solution
Answers
Explanation:
As we know, salt and water have different boiling points. Hence, we can use the "evaporation" technique to separate salt from salt solution. For this, one has to simply heat the salt solution till all the water boils and evaporates, and salt is left behind.
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Describe what does happen to the electrons when metal atoms are bonded together.
Answers
Answer: In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions. Metals are shiny.
Explanation: Hope this helped!
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Answers
NO LINKSSSS PLEASE!!!
Which of the following is an example of a gas solution?
Select one:
a. Air in water.
b. Antifreeze in water.
c. Bronze alloy.
d. Helium in air.
Answers
d- Helium in air me air is made up of various gases
which part of the chemical structure differentiates one amino acid from another?
Answers
Answer:
Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. This R group, or side chain, gives each amino acid proteins specific characteristics, including size, polarity, and pH.
Which two elements are in the same group based on their atomic model?
Please help me with this ASAP.
Answers
Answer: 1 and 2
i think
Explanation:
A solution is made by adding 200 g table salt to 1 L water. The solubility of salt is 36 g/100 mL water.
Which term best describes this solution?
dilute
saturated
supersaturated
unsaturated
Answers
Answer:
The answer is unsaturated
Answer:
supersaturated
Explanation:
how many valence electrons does P have?
Answers
Answer:
5 valence electrons
Explanation:
Phosphorus is in group VA so it has 5 valence electrons and Oxygen is in group VIA so each oxygen has 6 valence electrons.
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Answers
Answer:
the first one
Explanation:
hope this helps
The system containing all the muscles of the body especially those involved in movement CONSIST of the three types of muscle skeletal smooth and cardiac
Answers
how many atoms are there in 1.25 moles of Zn?
Answers
Answer:
7.53×10^23
Explanation:
i dont know how
Answer:
There are 6.25×10²³ atoms in 1.25 moles of Zn
Which subatomic particle has a positive charge?
Question 1 options:
all particles
neutron (n0)
proton (p+)
electron (e-)
Question 2 (2 points)
What information does the atomic mass of an element provide?
Question 2 options:
the difference between the number of protons and electrons (p - e)
the number of isotopes
the sum of electrons and protons in an atom (e + p)
the number of protons and neutrons in an atom (p + n)
Question 3 (2 points)
What is the atomic number of an atom?
Question 3 options:
the number protons and neutrons
the number of protons
the number of neutrons
the number of electrons and neutrons
Question 4 (2 points)
What is H2O (water) classified as?
Question 4 options:
a diatomic molecule
an atom
an element
a molecule
Question 5 (2 points)
Which property is a physical property?
Question 5 options:
easy to digest
becomes moldy quickly
does not burn
malleable (the quality of something that can be shaped into something else without breaking )
Question 6 (2 points)
What state of matter has a defined volume but undefined shape?
Question 6 options:
solids and liquids
liquids
liquids and gases
gases
Question 7 (2 points)
Which statement best describes the difference between a physical change and a chemical change?
Question 7 options:
A chemical change does not result in a new substance being formed, whereas a physical change does.
A chemical change results in a new element being formed, and a physical change results in a new compound being formed.
A physical change produces a new element, and a chemical change results in a bond breaking between atoms.
A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
Question 8 (2 points)
Where are nonmetals located in the periodic table?
Question 8 options:
in the middle
along the bottom
along the upper left side
along the upper right side
Question 9 (2 points)
The elements fluorine (F), chlorine (Cl), and Iodine are all part of the same ____________________ on the periodic table.
Question 9 options:
period
group
Question 10 (2 points)
How are elements arranged on the periodic table?
Question 10 options:
atomic mass (# of protons and neutrons)
atomic number (# of protons)
density
boiling point
Help please ill give 100 points
Answers
Answer:
SCORE WARNING ! ! ! (JUST FINISHED MY TEST AND GOT A B IM NOT SURE WHICH ONE WAS INCORRECT btw it was the K12 8th grade test)
1. C / Proton (p+)
2. D / the number of protons and neutrons in an atom (p + n)
3. B / the number of protons
4. D / a molecule
5. B / becomes moldy quickly
6. D / gases
7. D / A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
8. D / upper right side
9. B / group
10. B / atomic number (# of protons)
Explanation:
I just took the test
The positively charged subatomic particles are called protons. The mass number of an atom is the sum of number of protons and neutrons and the atomic number is the number of protons.
What is an atom?An atom is the basic unit every substances. It is made up of subatomic particles electrons, protons and neutrons. The positively charged particles are called protons. Whereas electrons are negatively charged.
The atomic number is the number of protons and the mass number indicates the sum of number of protons and neutrons.
Water can be classified as a diatomic molecule formed from two hydrogens and one oxygen atom. Among the given, malleability is a physical property. It is the ability to change the shape and size of metal blocks.
Liquids has definite volume but does not have a defined shape. They assume shape of the container.A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
Nonmetals are located in the side upper right side of periodic table. Metals are covered in left and middle portion. The elements F, Cl are in same group. All the elements are arranged in periodic table based on their atomic number.
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write the formulas of alkanes that contain three, five, seven, and nine carbon atoms
Answers
Answer:
Explanation:
Name Number of Carbon Atoms Molecular Formula
methane 1 CH4
ethane 2 C2H6
propane 3 C3H8
butane 4 C4H10
What happens to the wavelength and frequency of light as you move from red to violet?
A. Both wavelength and frequency increases.
B. Both wavelength and frequency decreases.
C. Wavelength decreases and frequency increases.
D. Wavelength increases and frequency decreases.
Answers
The volume of a balloon is 30 L at 313K and a pressure of 153KPA What is the volume at 273K and 101.3kPa?
Answers
Answer:
Explanation:
The volume of a balloon is 30 L at 313K and a pressure of 153KPA What is the volume at 273K and 101.3kPa?
from PV=nRT we can derive
PV/T =P'V'/T' so
153X30/313 = 101.3 X V'/273
OR 153 X 30 X273/(313 X 101.3) =V'
V' = 39.5 L
in structural isomers atoms and functional groups join together in different ways. which of the following statements is not correct with respect to structural isomers
Answers
Structural isomerism is based on the existence of different molecular
structures formed by the same elements.
The statement that is not correct with respect to structural isomers is; All
structural isomers show hydrogen bonding.
Reason:
Structural isomers are isomers that have different molecular structures but
the same molecular formula. They are referred to as constitutional isomers
Therefore;
The empirical formula which is obtainable from the molecular formula is the same for structural isomers.The structural formula of structural isomers are differentStructural isomers that are functional isomers have different chemical properties.However;
Structural isomers that are linkage isomers may not have hydrogen bonding.Therefore, the statement that is not correct with respect to structural isomers is; All structural isomers show hydrogen bonding.
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The question options are;
The same empirical formula among structural isomers.
Different physical and chemical properties can be possessed by structural isomers.
Structural isomers have different structural formulas.
Hydrogen bonding is shown in all structural isomers.
All the above statements are correct.
Which answer choice is it?
A 3d
B 4p
C 4d
D 4f
Answers
Answer:
3d
Explanation:
Franklin added a solid yellow dye tablet to each of these beakers one beaker (A) contained cold water, and the other beaker contained (B) hot water he took this picture after ten seconds to compare the results. What is the most likely investigating? Answer a. He is investigating the effect temperature has the movement of molecules.
b.he is investigating how food coloring tablets affect the temperature of water
c.he is investigating how to how to create new colors by mixing two or more or more other colors
d. he is investigation the effects of evaporation on water mixed with colored tablets
Answers
Answer:
a
Explanation:
a
PLEASE HELP ASAP 100 POINTS!!!!!
Answers
Answer:
Melting
Explanation:
• A chemical change is a change that can be reversed.
Other chemical changes include;
Melting (solid to liquid)Evaporation (liquid to gas)Condensation(gas to liquid)Sublimation (solid to gas and gas to solid)[tex].[/tex]Mitotic cyclins control the progression of S phase and mitosis. G1 phase and G2 phase. S phase and G2 phase. G2 phase and mitosis
Answers
Answer:
D
Explanation:
Its D
Answer:
Its d for edge
Explanation:
Design a procedure to test whether the honey that your mother bought from the
supermarket is pure honey or not.
Answers
Answer:
i would test it and get real honey to see if the ingredients are the same
Explanation:
Explanation:
Water Test: In a glass of water, put a spoon of honey, if your honey is dissolving in water then it's impure. Pure honey has a thick texture that will settle at the bottom of a cup or a glass. –Vinegar Test: Mix a few drops of honey into vinegar water, if the mixture starts to foam, then your honey is impure.
feeling generous today thank you guys so much
Answers
Answer:
16
Explanation:
you can line up the fareinheit and celsius and see that the celsius is 16
Answer:
15 and 290 for the first question, if it drops 30 it will get to be 30 f, -0 c and 273 k
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the source of gases for the secondary atmosphere of the earth was _______
Answers
The source of gases for the secondary atmosphere of the earth was Volcanic Eruptions.
What is Secondary Atmosphere ?
The scientist think that the atmosphere today is completely different from what it used to be originally and therefore they call it secondary atmosphere.
Internal volcanic activity or the deposit of debris from comet collisions produce a secondary atmosphere.
The secondary atmosphere is thought to have formed as a result of the numerous volcanic eruptions that occurred from the start of Earth's early periods.
Although each volcano is unique, they all emit gases such as H₂O, CO₂, SO₂, H₂S, HCl, N₂, NO₂, and others.
These gases are formed due to melting of the Earth's crust.
Volcanic activity renew the atmosphere's molecules.
These molecules are not the Nitrogen and Oxygen that make up the atmosphere today.
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Why do planets orbit faster as they get closer to the Sun?
The orbit becomes smaller closer to the Sun.
The orbit becomes smaller closer to the Sun.
The eccentricity changes as the planet gets closer to the Sun.
The eccentricity changes as the planet gets closer to the Sun.
The force of gravity increases closer to the Sun.
The force of gravity increases closer to the Sun.
The Sun's magnetism causes a "sling shot" effect.
Answers
Explanation:
The speed at which a planet orbits the Sun changes depending upon how far it is from the Sun. When a planet is closer to the Sun the Sun’s gravitational pull is stronger, so the planet moves faster. When a planet is further away from the sun the Sun’s gravitational pull is weaker, so the planet moves slower in its orbit.
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The reaction of aluminum with chlorine gas is shown.
2Al+3Cl2⟶2AlCl3
How many units of aluminum chloride (AlCl3) can be produced from 30 aluminum atoms?
number of AlCl3 units: _________________
Answers
The number of units of aluminum chloride (AlCl₃) that can be produced from 30 atoms of aluminum (Al) is 30 units
The balanced equation for the reaction is given below:
2Al + 3Cl₂ — > 2AlCl₃
From the balanced equation above,
2 atoms of Al reacted to produce 2 units of AlCl₃.
With the above information, we can determine the number of units of AlCl₃ that can be produced by the reaction of 30 atoms of Al. This can be obtained as follow:
From the balanced equation above,
2 atoms of Al reacted to produce 2 units of AlCl₃.
Therefore,
30 atoms of Al will also react to produce 30 units of AlCl₃.
Thus, 30 units of AlCl₃ were obtained from the reaction.
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What determines the energies of light that an element can absorb?
Answers
Answer:
Atom
Explanation:
An atom can absorb or emit one photon when an electron makes a transition from one stationary state, or energy level, to another. Conservation of energy determines the energy of the photon and thus the frequency of the emitted or absorbed light.
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Answers
Answer:It’s cyclone movement
Explanation:
Compared to the atomic radius of sodium, the atomic radius of argon is smaller. This is a result of
Answers
The atomic radius of Argon is smaller than the atomic radius of sodium because the effective nuclear charge increases as we move left to right in a period.
What is the atomic radius?The atomic radius can be described as the shortest distance between the center of the nucleus of the atom and the outermost shell of the atom. An atomic radius can also be defined as half the distance between two atoms of the same element bonded together.
In general, the atomic radius of an atom reduces as we move from left to right in a period on the periodic table because while moving from left to right in a period, there is an increase in the effective nuclear charge. In periods, the valence electrons enter in the same outermost shell.
The atomic radius of atom increases when we move down a group because of the addition of a new principle shell.
Sodium is present at beginning of the third period and the Argon is present at the end of the same period. Therefore, Argon experiences a more effective nuclear charge than sodium so it has a smaller atomic radius.
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