Which statement about the Periodic Table is correct?
A Elements are arranged in order of decreasing proton number.
B Group number is the number of electron shells in atoms of the elements in the group.
C Group numbers can be used to predict the charges of ions.
D Metallic character increases left to right across a period.
answer :c
explanation :
group numbers can be used to determine the number of electrons in the outer most shell thus if the group numbers are above four then the elemnts are negative ions if less than four then posetive
True or false? In giant covalent structures the atoms form strong bonds by sharing electrons.
Answer:
True
Explanation:
its true don't lie on here please
In giant covalent structures such as graphite or diamond, the atoms form strong bonds by sharing electrons. Therefore, the given statement is true.
What is a covalent bond?A covalent bond can be defined as a chemical connection formed by the sharing of electron sets between particles. A covalent bond can be created by the mutual sharing of electrons from both atoms.
The pair of electrons that are shared in this kind of bonding is known as the shared or bonding pair. Covalent bonds are the sharing of bonding pairs of electrons that will provide the stability of the atom in its outer shell.
Elements that have very high ionization energies are incapable of exchanging electrons or elements having low electron affinity cannot accept electrons. Covalent bonding between two non-metallic atoms is characterized by the equal sharing of electrons between the atoms and covalent bonds with an electronegativity difference of participating atoms is more than 2.0.
Therefore, a giant structure like a diamond has strong covalent bonds that require a lot of energy to break.
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arrange the compounds from lowest boiling point to highest boiling point.
Answer:
ion- ion> H - bonding > dipole > dipole> london dispersion
It accounts for the differences in the behavior of particles in different states. *
Answer:
Matter
Explanation:
Solids, liquids, and gases are the three types of matter that can be found in the world around us today. In solids, all of the particles are close together. They move more in liquids, but they are spread out in gas.
What percentage of the Periodic Table of Elements is Metals?
80 percent
About 80 percent of the elements are metals (shiny elements that conduct heat and electricity well), and 15 percent of the elements are nonmetals (poor conductors of heat and electricity). The remaining elements are metalloids, which share properties of both metals and nonmetals.
Answer:
80% of the Periodic Table consists of metals and 15% non-metals and 5% other elements.
Explanation:
Given that the molar mass of NaCl is 58. 44 g/mol, what is the molarity of a solution that contains 87. 75 g of NaCl in 500. ML of solution? Use Molarity equals StartFraction moles of solute over liters of solution EndFraction. 0. 333 M 0. 751 M 1. 50 M 3. 00 M.
Answer:
D
Explanation:
Given that the molar mass of NaCl is 58.44 g/mol, we want to determine the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution.
Recall that molarity is given by:
[tex]\displaystyle \text{M} = \frac{\text{ mols solute}}{\text{ liters soln.}}[/tex]
Therefore, we can convert the amount of NaCl in the solution to moles of NaCl and the volume from milliliters to liters:
[tex]\displaystyle \begin{aligned} \text{M} & = \frac{(87.75 \text{ g NaCl})}{(500. \text{ mL soln.})} \cdot \frac{1 \text{ mol NaCl}}{58.44 \text{ g NaCl}} \cdot \frac{1000 \text{ mL soln.}}{1 \text{ L soln.}} \\ \\ & = 3.00\text{ } \frac{\text{mol NaCl}}{\text{ L soln.}} \\ \\ & = 3.00 \text{ M} \end{aligned}[/tex]
Hence, our answer is D.
Which elements are the most reactive and why?
Answer:
Fluorine is identified as the most reactive nonmetal and the most electro-negative element in the periodic table, making it the strongest oxidizing agent. Caesium is the most reactive metal in the periodic table, so much that working with this metal often ends in explosions!
Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.
Hope that helps.
what is the ph of a peach with a [ –oh] = 3.2 × 10 –11 m?
Answer:
Amerigo Vespucci, was the first European to reach the Caribbean Islands.
Please select the best answer from the choices provided
T
F
Explanation:
What is the percent, by mass, of water in MgSO4.2H20
Answer:51.1%
Explanation:
Mass percent : It is defined as the mass of the given component present in the total mass of the compound. Formula used : First we have to calculate the mass of and . Mass of = 18 g/mole Mass of = 7 × 18 g/mole = 126 g/mole Mass of = 246.47 g/mole Now put all the given values in the above formula, we get the mass percent of in . Therefore, the mass percent of in is, 51.1%
what happens when carbon dioxide gas is cooled to -78 degree Celsius
Answer:
It will be solid
Explanation:
-78 C° is the freezing point of carbon dioxide, so at the temperature of -78 Celsius, the particles of carbon dioxide will come closer together and have about a fixed position to vibrate. The carbon dioxide will turn into solid. The solid form of carbon dioxide is also called dry ice.
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Jason completed an experiment and found the materials that conduct electricity and the materials that do not conduct electricity well. He made a table of his findings, but he made one mistake. Review his table, and choose the best answer that will correct the error in his table.
Conducts Electricity Does Not Conduct Electricity Well
Silver necklace
Rubber boot
Cast iron frying pan
Plastic cell phone case
Ceramic coffee cup
Glass cup
A. A rubber boot does not conduct electricity well, so it is in the wrong group.
B. A glass coffee cup conducts electricity well, so it is in the wrong group.
C. A plastic cell phone case conducts electricity well, so it is in the wrong group.
D. A cast iron frying pan does not conduct electricity well, so it is in the wrong group.
Answer:
A.) A rubber boot does not conduct electricity well, so it is in the wrong group.
Explanation:
A glass coffee cup conducts electricity well when it is heated
Answer:
i think the answer is a rubber boot if i am correct
Explanation:
11. The ease with which water can pass
through a rock or sediment is called
a. permeability c. porosity.
b. carbonation. d. velocity
Answer:
It's option a) Permeability.
Pls help if you only know the correct answer! Thanks! :)
Answer:
i think itd be an exothermic reaction
Explanation:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.
5. Scientists always develop a plan when they try to learn something about our natural world. Which
sequence correctly shows the steps scientists follow in their plan?
A. make observations, develop an idea, obtain evidence, suggest an explanation
B. obtain evidence, suggest an explanation, develop an idea, make observations
C. suggest an explanation, obtain evidence, make observations, develop an idea
D. develop an idea, suggest an explanation, obtain evidence, make observations
dose any body know 2(-3+6)=
______
3
Answer: The answer is 6
1) Simplify -3+6 to 3.
2×3
And then Simplify.
6
Sorry if im wrong
4. Which of the following statements accurately compares the wavelengths of the waves shown below?
A) wave 1 has a smaller wavelength than wave 2
B) wave 1 has a larger wavelength than wave 2
C) wave 2 has a larger wavelength than wave 1
D) wave 1 and wave 2 have the same wavelength
Answer:
B. wave 1 has a larger wavelength than wave 2
Wave 1 has larger wavelength than wave 2. Hence, option B is correct.
What is Wavelength?Wavelength is defined as "the difference between two successive crests and troughs of the wave. The wavelength described the how long wave is. It is measure in the direction of wave.
Wavelength is usually denoted by the Greek letter ( λ ).
Wavelength is equal to the speed ( V ) of wave train to divided by frequency ( F ). It is given as,
λ = V ÷ F
Here,
λ = wavelength
V = speed
F = frequency
The distance between one crests (top) to another crests is a Wavelength. Alternately the distance between one troughs (bottom) to another troughs is wavelength.
The distance between two crests in wave 1 is more comparatively wave 2 so , wave 1 will have larger wavelength than wave 2.
Therefore, wavelength is used for measuring the radiation.
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Summarize: Complete the following statements:
A. 1 mole of any element contains 6.0221 x 1023 _____
B. 1 mole of any compound contains 6.0221 x 1023 ______
Answer:
Explanation:
Taking into account the definition of Avogadro's Number, the correct answers are:
1 mole of any element contains 6.023×10²³ atoms
1 mole of any compound contains 6.023×10²³ molecules
You have to know that Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression.
Avogadro's number applies to any substance, because the number of elementary units in a mole of a substance is, by definition, a constant that does not depend on the material or the type of particle considered.
So, in this case, the correct answers are:
1 mole of any element contains 6.023×10²³ atoms
1 mole of any compound contains 6.023×10²³ molecules
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It takes 25 mL of 0.20 M of hydrochloric acid (HCI) to neutralize 50 mL of
sodium hydroxide (NaOH). What is the concentration of sodium
hydroxide?
Answer:
0.1 M
Explanation:
(25 mL) (0.20 M) / 50 mL = 0.1 M
Calculate the following. Be sure to follow significant figure rules.
1.) 1.2 m + 2.35 m =
Ignore me I dont know what im doing.
What is the enthalpy of combustion when 1 mol C6H6(g) completely reacts with oxygen? 2C6H6(g) 15O2(g) mc001-1. Jpg 12CO2(g) 6H2O(g) â€""6339 kJ/mol â€""3169 kJ/mol 1268 kJ/mol 6339 KJ/mol.
The enthalpy of combustion of 1 mole of benzene is 3169 kJ/mol .
The first step in answering this question is to obtain the balanced thermochemical equation of the reaction. The thermochemical equation shows the amount of heat lost or gained.
The thermochemical equation for the combustion of benzene is;
2 C6H6(l) + 15 O2(g) → 12 CO2(g) + 6 H2O(g) ΔrH° = -3169 kJ/mol
We can see that 1 mole of benzene releases about 3169 kJ/mol of heat.
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Answer:
-3169 kJ/mol
Explanation:
what are the products of any combustion reaction involving a hydrocarbon
Answer:
The products of the combustion of hydrocarbons are carbon dioxide and water. Many hydrocarbons are used as fuel because their combustion releases very large amounts of heat energy.
Answer:
The products of the combustion of hydrocarbons are carbon dioxide and water. Many hydrocarbons are used as fuel because their combustion releases very large amounts of heat energy.
Explanation:
Q2. Fill in the blank with correct words.
A: Chemical B: Horizontal C: Shells D: Columns E: Group VII
1) The vertical ___________are called groups and the_____________rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer_______________ for example, all the elements in ___________ have 7
electrons on their outer shells.
3) Elements in the same group have similar ___________ and physical properties
Answer:
Explanation:
1) The vertical Columns are called groups and the Horizontal rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer Shells for example, all the elements in Group VII have 7
electrons on their outer shells.
3) Elements in the same group have similar Chemical and physical properties
Explanation:
1) Columns
Horizontal
2)Shell
Group VII
3)Chemical
Lead has an atomic number of 82. Which statement describes all neutral atoms and ions of lead?
Neutral atoms of lead must have 82 electrons. Ions must have 82 electrons, as well.
Neutral atoms of lead must have 82 neutrons, but ions can have more or fewer.
Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
Neutral atoms of lead must have 82 protons, but ions can have more or fewer.
The neutral atom of lead must have 82 protons while ions can have b or less than 82.
The atomic number of an element is the number of protons in the nucleus of the element.
Also, for neutral atoms, the number of protons equals the number of electrons.
In ionic form, the number of protons/electrons of an atom may vary and be different from that of the neutral form.
Positive charges mean that the ion has less proton than its neutral version while negative charges mean that it has more electrons than its neutral version.
Thus, the neutral atom of lead will contain an equal number of protons as the electrons while its ionic form can have more or less than 82 protons.
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I hope you can see because I really need help! I’ll give you 5 stars!
Answer:
In the picture A kettle is boiling water and evaporating it we can see the water vapours coming out of the kettle and there is a paper on top of the kettle from where the water vapours are coming out .
Explanation:
is this right ?? i hope it helps
Which of the following giant covalent structures is a good conductor of electricity?
a) polythene
b) diamond
c) graphite
d) silicon dioixide
what is the mechanical hound in the book fahrenheit 451
Explanation:
The Mechanical Hound is a robotic animal that firemen can deploy to hunt and catch fugitives. It can be trained and programmed to hunt its prey very quickly by smell. Once it catches its prey, the Hound injects the person with a sedative; unable to run, the drugged fugitive is easily captured.
give explanation ~~
Why are cloudy nights warmer than clear nights?
4
Which statement about an ionic compound is not correct?
A It conducts electricity when dissolved in water.
B It has a high melting point due to strong attractive forces between ions.
с It has a regular lattice of oppositely charged ions in a 'sea of electrons'.
D The ionic bonds are formed between metallic and non-metallic elements.
Answer:
it conducts electricity when dissolved in water
Explanation:
the water molecules bond to positive and negative ions results to breaking of lattice and it's fixed position broken
What is a Chemical Properties and Physical Properties? Please tell me the deffinition of them both.
Answer:
All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.
Explanation:
what is the difference between hydrophilic and hydrophobic?