As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the effective nuclear charge and increase in the ionization enthalpy.
What is effective nuclear charge?Effective nuclear charge of an atom is the attraction force of positive charge of protons present inside the nucleus acts as an valence electrons.
The effective nuclear charge is alway slower than the total number of protons of the nucleus because of shielding effect. Where Z is the atomic number and S is the number of shielding electrons.
Therefore, the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the effective nuclear charge and increase in the ionization enthalpy.
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Explain why hydrogen is a substance.
Answer:
Hydrogen is a substance because it has mass and combined with other molecules it can make another substance such as water.
Explanation:
is density defined as the volume in a given mass orthe mass in a given volume?
Answer:
mass in a given volume
Explanation:
Density is the mass in a given volume or mass per unit volume of a substance.
Mass is defined by the amount of matter present in a substance.
Volume is the space occupied by a body.
Density is the mass divided by the volumeMathematically;
Density = [tex]\frac{mass}{volume}[/tex]
The ionization energy of chlorine is lower than the ionization energy for
Answer: Fluorine.
Explanation:
whats the difference between spring tides and neap tides
Answer:
Spring tides have higher high tides and lower low tides whereas neap tides have lower high tides and higher low tides.
Explanation:
Answer:
Spring tides have higher high tides and lower low tides whereas neap tides have lower high tides and higher low tides. Hence, the range (difference in water level between high and low tide) is much larger in a spring tide than in a low tide.
Who used scientific investigations to study atoms? Check all that apply.
Answer:
In the early 1900s, Ernest Rutherford studied (among other things) the organization of the atom — the fundamental particle of the natural world. Though atoms cannot be seen with the naked eye, they can be studied with the tools of science since they are part of the natural world.
Newton’s second law can be written using two formulas, what are they?
Answer:
In equation form, Newton's second law of motion is a=Fnetm a = F net m . This is often written in the more familiar form: Fnet = ma. The weight w of an object is defined as the force of gravity acting on an object of mass m. ... Friction is a force that opposes the motion past each other of objects that are touching.
Explanation:
have a nice day :)
How does energy change form when friction causes the temperature of an object to increase?
Friction causes the molecules on rubbing surfaces to move faster, therefore they have more energy. This gives them a greater temperature, and they feel warmer.
What is friction ?The term friction is defined as the resistive force that occurs when two bodies in contact move relative to one another.
Adhesion between body surfaces, and the adhesion is the molecular force that occurs when two materials come into contact with each other are the causes of friction.
Friction is an everyday force that is generated by two surfaces when they are interacting. When these surfaces slide against each other, this interaction increases the thermal energy of the two surfaces.
Thus, Friction causes the molecules on rubbing surfaces to move faster, therefore they have more energy.
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In the rock cycle, which rock type may be weathered to become sediment, and eventually sedimentary rock?
I. Igneous Rock
II. Sedimentary Rock
III. Metamorphic Rock
I and II only
I and III only
II and III only
I, II, and III
i think it is I. and III.
:)
Answer:
d (I think)
Explanation:
the rock cycle is a very slow, but natural process, and it may skip a stage (for example, metamorphic rocks might skip the igneous stage and weather right to sedimentary) if this is incorrect, I apologize
please help!!!
Which of the following are found as the lithosphere moves a volcano away from a mantle plume?
a- sea mounts
b- lithospheric mountains
c- subduction zones
d- none of these
Answer:
c- subduction zones
Explanation:
A mental plum is generally found within the mantel and is a mechanism of convection, the plume is often invoked as the causes of volcanic hotspots. Such can be seen on Iceland and Hawaii islands. They represent a large volume of volcanism near the plate boundary. Mantle plumes are believed to be a source of molten magma from the earth.The four level pyramid model revolves around the. Who use the system
Answer:
Explanation: The pyramid model of four level in an organization is based on and is depends on the various levels of the hierarchy systems or management in the organization. These four level is of different types of the Information System in the organization.
Explanation:
Your older sister drove 500 miles to college one way in ten hours. What was her average speed?
7. Calculate the amount of energy required heat 100.g to
H2O(s) changes to H2O(l) at 0°C
Answer:
33300J
Explanation:
Given parameters:
Mass of ice = 100g
Unknown:
Amount of energy = ?
Solution:
This is a phase change process from solid to liquid. In this case, the latent heat of melting of ice is 3.33 x 10⁵ J/kg.
So;
H = mL
m is the mass
L is the latent heat of melting ice
Now, insert the parameters and solve;
H = mL
mass from gram to kilogram;
100g gives 0.1kg
H = 0.1 x 3.33 x 10⁵ = 33300J
What is responsible for the high electrical conductivity of a metal
Answer:
Electrical conductivity in metals is a result of the movement of electrically charged particles. Because valence electrons are free to move, they can travel through the lattice that forms the physical structure of a metal.
Explanation:
Based on the following electronegativity values, which of the following best explains the polarity of the bond formed?
Element
Electronegativity
Carbon 2.5
Fluorine 4.0
Lithium 1.0
Question 1 options:
Li-F is covalent because the electronegativity difference is 5.0
C-F is ionic because the electronegativity difference is 1.5
Li-F is ionic because the electronegativity difference is 3.0
C-F is covalent because the electronegativity difference is 6.5
Answer:
see the pic for the answer
No matter where the moon is in its orbit around Earth, how much is it lit up?
Where the light source come from?
PLZ HELP IRS DUE TODAY
Answer:
the light comes from the sun
Explanation:
the light from the sun reflects on the moon and the moon gets its light.
The moon is always half-lit by the light that comes from the sun except during the lunar eclipse. The light source for the moon is the sun.
What are the phases of the moon?The lunar phase or Moon phase can be described as the shape of the Moon's directly sunlit portion, which can be demonstrated quantitatively using areas or angles, or qualitatively utilizing the terminology of the four major phases: new moon, first quarter, full moon, last quarter.
The lunar phases gradually change over a month as the Moon's orbital positions around Earth and the position of the Earth around the Sun shift. The visible side of the Moon is sunlit, according to the position of the Moon in its orbit.
Thus, this face's sunlit part of the moon can vary from 0% to 100%. Each of the 4 major lunar phases is approximately 7.4 days, with +/− 19 hours in variation due to the elliptical shape of the orbit of the Moon.
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A scientist observes hot water erupting from a vent in the Earth.What most likely caused the water to rise and erupt from the vent? someone pls answer i if u answer u get 57 points
Answer/Explanation:
A geyser is hot water erupting from a vent in the earth. Geysers are somewhat rare and occur in certain parts of the earth. Underneath, there are hidden chambers that provide constant flows of water. Sometimes when the tectonic plate of the earth move, it leaves gaps in between the hot earth's inner core and the ground. The magma inside is able to heat up the water from the earth. Since hot particle tend to rise, the water explodes out of the vent with such power from the heat.
Helpppppp please helpppp helpppp
What does the big ‘2’ in 2NH3 mean?
Answer:
hiiii ;) how ru to day
Explanation:
How could two objects have the same temperature but different thermal energies? One object could have more particles and greater total kinetic energy. One object could have more particles and lesser total kinetic energy. One object could have more calories. One object could have more heat.
Answer:
One object could have more particles and greater total kinetic energy
Explanation:
The higher the temperature the more the particles. So, when we have high temperature, there is more particles interacting.
Temperature can simply be defined or gotten by taking the average of of the kinetic energy of the particles in the object that is the keywords here are TAKING THE AVERAGE KINETIC ENERGY
Thermal energy is the energy that can be gotten from adding up all the total kinetic energy of the particles in the object. So, the keywords here are; ADDING UP THE TOTAL KINETIC ENERGIES.
So, when two particles of the same temperature have the different thermal energy it means that One object could have more particles and thus having greater total kinetic energy.
What are minerals the building blocks of?
Answer:?
Explanation:
Answer:
Minerals are the building blocks of rocks. Nature cements combinations of minerals together to form rocks.
Explanation:
C2H6BrCl is a compound. What is the ratio of carbon to bromine atoms in the molecules!
1:1
1:3
1:6
3:1
3:6
6:1
3:6:1
Answer:
3 1
Explanation:
Plz help on question 3
Answer:I wish I could help but I can’t I have to answer 5 questions to get help on my question!
Explanation: I’m really sorry
Answer:5.5 grams
Explanation: because you have to divide 19.3 /3.5 and you will get 5.5
If you have 1kg of carbon and 1 kg of gold, they will weigh the same.
Help please ASAP I’ll mark you as brainlister
Answer: FeO is called ferrous oxide while Fe2O3 is ferric oxide
Explanation:
Ferrous oxide, commonly known as iron(II) oxide contains iron that lost 2 elections in the oxidation process. So it is able to bond with other atoms that have an extra 2 electrons to share. Ferric oxide, is commonly known as iron(III) oxide
Which of the following is an indication of a chemical reaction? ( freezing, melting ,release of heat ,all of the above)
Answer:
all of the above
Explanation:
Answer: All of the above
Explanation:
Humans and animals are not able to use all the energy that is obtained The extra energy is released as:
A. light
B. sound
C. heat
D. kinetic
Answer:
The C. Heat
Explanation:
It is logical, when you workout you feel hot cause your body emanates heat
plants get energy from the
Answer:
Plants need energy from the sun, water from the soil, and carbon from the air to grow. Air is mostly made of nitrogen, oxygen, and carbon dioxide. So how do plants get the carbon they need to grow? They absorb carbon dioxide from the air.
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How many grams of H2SO4 do I need to use in order to produce 3.01 moles of water? consider the equation. _Ca(OH)2 + _H2SO4 = _CaSO4 + _H20
Answer:
148 g H₂SO₄
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableBalancing RxN'sUsing Dimensional AnalysisExplanation:
Step 1: Define
RxN: Ca(OH)₂ + H₂SO₄ → CaSO₄ + H₂O
Given: 3.01 moles H₂O
Step 2: Balance RxN
Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O
Need the same amount of O's and H's on both sidesStep 3: Define conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol
Step 4: Stoichiometry
[tex]3.01 \ mol \ H_2O(\frac{1 \ mol \ H_2SO_4}{2 \ mol \ H_2O} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 147.625 g H₂SO₄
Step 5: Check
We are given 3 sig figs. Follow sig fig rules.
147.625 g H₂SO₄ ≈ 148 g H₂SO₄
What is Zirconium-78 protons and neutrons?
Answer:
Zirconium has 40 protons and 51 neutrons
Which cellular process allows a cell to make an exact copy of itself?
A. mitosis
B. photosynthesis
C. respiration
D. waste elimination
Explanation:
the answer is letter A. mitosis