Answer:
The lattice energy decreases down the group and increases across the period, therefore, the lattice energy of LiF > lattice energy of LiI, and the lattice energy of NaCl < the lattice energy of AlCl₃
Explanation:
The given parameters are;
Compound [tex]{}[/tex] Lattice Energy (kJ/mol)
LiF [tex]{}[/tex] 1030
NaCl [tex]{}[/tex] 788
MgCl₂ [tex]{}[/tex] 2326
LiI [tex]{}[/tex] 730
AlCl₃ [tex]{}[/tex] 5376
Lattice is the energy that must be added in order to split one mole of a ionic solid compound into gaseous ions
Given that the force of attraction between charges is inversely proportional to the square of the distance separating the charges, we have that as the atomic radius increases progressively down the group, the lattice energy decreases, therefore, LiF which has a shorter inter nuclear distance than LiI due to fluorine, F, being higher up on the periodic table than iodine, I, has a greater lattice energy than LiI
Similarly, given that the atomic radius decreases across the period, and that sodium, Na, comes before aluminum, Al, as we move across period 3, of the periodic table, the inter nuclear distance between atoms of in NaCl is larger than the internuclear distances between the atoms of AlCl₃, as well as the presence of more chlorine atoms in AlCl₃ than in NaCl, the lattice energy of NaCl is smaller than the lattice energy of AlCl₃.
How are hypotheses different from theories?
Answer:
Explanation:
This is the Difference Between a Hypothesis and a Theory. In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.
two atoms are isotopes of the same element, the atoms must have
Answer:
the answer is isotopes
I hope this will help you
The molarity of 8 grams of an aqueous solution of sodium hydroxide in 2 liters of solution is what?
Answer: 0.125
Explanation:
8g divided by 39.997. Then divide that answer by 2.
Answer:
0.1 M
Explanation:
Pleaseee help me on this
Does the number of molecules change when a substance changes state?
Answer:
Molecules do't break up and reform when a substance boils and cools. Particles stay the same size and shape during state changes.
Explanation:
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7. If we have the same number of protons and electrons, our atom is ___________________________.
A: Negative
B:Positive
Answer:
It's actually Neutral
Explanation:
equal number of negative electric charges (the electrons) and positive electric charges (the protons).
Which postulate of Dalton’s atomic theory has not been disproved by further investigation?
A. All matter is made of tiny particles called atoms.
B. Atoms are indivisible and indestructible.
C. All atoms of a given element have the same mass.
D. Atoms of an element are all identical.
Answer:
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons...
hope this helps u
The Daltons atomic model gave the theory of chemical combination and the law of conservation of atoms. All matter is made of atoms is not disapproved. Thus, option A is correct.
What was Dalton’s atomic theory?Dalton’s atomic theory was given by John Dalton and involved several main points. According to the theory that matter has been composed of tiny atoms that are indestructible and indivisible.
It also stated about the mass, as atoms of various elements have different masses and the properties are shared by the atoms of the same element only. It gave rise to the law of conservation of mass, definite, and multiple proportions.
One of the laws is about matter being made of tiny particles called atoms. It has been not disproved by further investigation in any of the atomic models and theories.
Therefore, option A. the matter is made of atoms is not disproved.
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I need help with 2, 3, and 4 please help i will give the brainliest
Answer:
2=2.28*10^5
3=3.98*10^3
4=5.76*10^3
which factor affects an objects weight but not its mass?
A. Volume
B.Magnetism
C. Gravity
D Conductivity
Answer:
Gravity
Explanation:
Gravity is the pull of an object to another object like a human to the Earth. This is weight.
Answer:
C. Gravity
Explanation:
Just Took The Test And Got A Perfect Score. ;)
How did Moseley establish a more accurate periodic table?
what kind of bond is between a halogen and an alkali metal
will ya'll help me, please
Answer:
Either A or D
But i think D
hope this helps =3
sorry if im wrong
A student wants to find the volume of a rock. the student starts with 25ml of water in their graduated cylinder that water level rises to 37ml. what is the volume of the rock?
Answer:
12 ml
Explanation:
the answer will be calculated by subtracting 37 ml from 25 ml so ,
37 - 25
= 12 ml
A given sample of oxygen occupies 500 mL when the pressure is 800 mmHg. What volume will the gas occupy at 200 mmHg, provided the temperature remains constant?
Answer:
The volume of the gas at 200 mmHg will be 2 L.
Explanation:
As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them fewer times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:
"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"
Boyle's law is expressed mathematically as:
P * V = k
Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:
P1 * V1 = P2 * V2
In this case:
P1= 800 mmHgV1= 500 mLP2= 200 mmHgV2= ?Replacing:
800 mmHg* 500 mL= 200 mmHg* V2
Solving:
[tex]V2=\frac{800 mmHg* 500 mL}{200 mmHg}[/tex]
V2= 2,000 mL= 2 L (being 1,000 mL=1 L)
The volume of the gas at 200 mmHg will be 2 L.
A 4.86 g piece of metal is placed in a graduated cylinder containing 15.5 mL of water the water level rose to 17.3 mL what is the density of the metal
Answer:
The answer is 2.70 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 4.86 g
volume = final volume of water - initial volume of water
volume = 17.3 - 15.5 = 1.8 mL
So we have
[tex]density = \frac{4.86}{1.80} \\ [/tex]
We have the final answer as
2.70 g/mLHope this helps you
Assume that an object has been placed in the pan of a triple beam balance. The
scales of the balance are shown below. What is the mass of the object?
Answer:
190.4 g
Explanation:
To obtain the mass of the object, we must be able to obtain the reading of the triple beam balance.
Thus, the reading of the balance can be obtained by simply adding the various values as indicated by the pointer in each scale.
This can be obtained as follow:
Scale 1 = 90 g
Scale 2 = 100 g
Scale 3 = 0.4 g
Reading of the balance = Scale 1 + Scale 2 + Scale 3
Reading of the balance = 90 + 100 + 0.4
Reading of the balance = 190.4 g
Thus, the mass of the object as indicated by the triple beam balance is 190.4 g.
PLEASE HELP!!!!!
How much energy is needed to raise the temperature of 2.5 L of water from 20 C to 50 C? (anwer must be in Joules)
Answer:
8368 Joules
Explanation:
How can some of the difficulties caused by the Down Syndrome be over come?
The sphere was dropped into water in a graduated cylinder as shown below
Answer:65 ML
Explanation:
the only nonmetal in group 1
Answer:
Hydrogen
Explanation:
Hydrogen is the only non metal in group on of the period table of elements.
Which of the following forces weathers objects by expanding and changing shape?
Moving water
Wind
Plants
Ice
The equation 1/2 N2 + 3/2 H2+ NH3 is not appropriately written because
Answer:
Madar choad sale kuuuta kamina
A combustion reaction occurs between one molecule of methane (CHa) and two molecules of oxygen (O2).
How many atoms of carbon, hydrogen, and oxygen make up the products for this combustion reaction?
O A) 1 carbon, 1 hydrogen, and 1 oxygen
O B) 1 carbon, 1 hydrogen, and 2 oxygen
O C) 1 carbon, 4 hydrogen, and 2 oxygen
OD) 1 carbon, 4 hydrogen, and 4 oxygen
The total number of atoms make up the products :
D) 1 carbon, 4 hydrogen, and 4 oxygen
Further explanationComplete combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O compounds.
If O₂ is insufficient there will be incomplete combustion produced by CO and H and O
Hydrocarbon combustion reactions (especially alkanes)
For combustion of methane (CH₄) and two molecules of oxygen (O₂).
[tex]\tt CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
The number of atoms make up the products
CO₂ : 1 carbon, 2 oxygen
2H₂O : 4 hydrogen , 2 oxygen
The total number of atoms make up the products :
D) 1 carbon, 4 hydrogen, and 4 oxygen
Combustion Reaction:Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat.
Combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O compounds.
If O₂ is insufficient there will be incomplete combustion produced by CO and H and OFor combustion of methane (CH₄) and two molecules of oxygen (O₂).The number of atoms make up the products:CO₂ : 1 carbon, 2 oxygen
2H₂O : 4 hydrogen , 2 oxygen
Thus, the correct option is D.
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PLEASEEE HELPPP!!!! AND EXPLAIN PLS
Answer: True?
Explanation: THere is no question but I do know that is true because I answers that on a test and got it right. It was asking about:
how many Helium and oxygen molecules = H2O = + O2
help please lol I’m stuggling
Answer:
balenced
Explanation:
PLEASE ANSWER FAST
A model of an atom is shown above. The blue dots represent electrons, and the red dot represents the nucleus. This model accurately represents
A.
that electrons are found everywhere in an atom, even in the nucleus.
B.
what an atom would look like when seen through a microscope.
C.
that a single atom may have many nuclei.
D.
that the nucleus is located at the center of the atom.
Answer:
D. that the nucleus is located at the center of the atom
I hope that this helps!
There are several atomic models which explain the structure of atoms. Here the given model of atom is similar to Rutherford's model of atom. The nucleus is located at the center of the atom. The correct option is D.
What is Rutherford's atomic model?In Rutherford's atomic model, he bombarded a thin sheet of gold foil with high energy alpha particles and made several observations. He said that most of the space inside the atom is empty. A heavy positively charged body called nucleus is present inside the atom.
The nucleus is capable of repelling and deflecting highly energetic alpha particles and also has a appreciable mass and charge. The volume occupied by the heavy positively charged body must be very very small.
Here in the given model, blue dots are electrons which revolve around the nucleus and the red dot is the nucleus which is present at the centre.
Thus the correct option is D.
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Which element has a greater atomic radius Mg or Cl?
True or False?
To increase acceleration of a object, you reduce its mass or increase the applied force.
Help please 2 mins til it submits
What Element am I?
I have 5 Valence Electrons.
I am in the 5th row.
My atomic mass is less than Bismuth *
с
Answer:
Nitrogen
Explanation:
Nitrogen has 5 Valence Electrons.
And its atomic mass is also less than Bismuth.
There are other elements in the 5th row but this one has the lowest atomic mass compared to the others.