Negative and positive ions alternate in the ionic crystals. For instance, the melting point of calcium fluoride (CaF[tex]_2[/tex]) is 1418 °C. Therefore, the correct option is option C.
What is Crystalline Solid?The description of crystalline solid states that it is a substance whose atoms or even subatomic particles are organized in a highly structured form. Atomic nuclei in metallic crystals are surrounded by a "sea" of delocalized electrons.
Molecules of many types make up molecular crystals. Atoms that are covalently bound to one another make up covalent network crystals. Jewelry is crafted with diamond. Quartz is used to create things like watches and wall clocks. Among all the given options diamond is the only compound which is Crystalline Solid.
Therefore, the correct option is option C.
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22. Write a balanced equation for each of the following reactions.
b) Magnesium metal with steam.
Answer:
2Mg(s) + O2(g) - >2MgO(s)
how do you find molecules????? asap please!!!
how did Bohr change Rutherford's model
Explanation:
To solve that deadlock problem, in 1913 Bo kept Rizopho's model of planetary atom and combined with Plang quantum theory, he produced a hydrogen atom model with the following three determinations: - In atoms, The clectron cannot orbit any other, but only rotates with a certain number of orbits. Each "allowed" orbit is equivalent to a certain energy. - When rotating in "allowed" orbits, electrons do not lose energy, meaning they do not emit radiation, but emit radiation only when the electron jumps from an orbit with the high energy level in the orbit corresponding to the the low energy and the household energy of radiation are equal to the difference of the two energy levels. - - When rotating in those "allowed" orbits, the electron has a momentum moment that is an integer times of h / (2π).
what are the formulas?
Explanation:
Answer 1-4
1. Cr(NO2)3
2. AlCl3
3. Na2CO3
4. Ba(OH)2
Round 1047.78 to three sig figs
105
1048
1050.00 and 1050 PLEASE HELP
Answer:
105
Explanation:
round 104 to the nearest whole number...since 7 is greater than 5 4 goes up..but if 7 is less than 5,4 remains the same
If the density of a set of keys is 8 g/cm', what is the volume if its mass is 54 g?
a.432 mL
b. 6.75 mL
c. 432 g
d. 0.148 mL
Answer:
the volume of a set of keys is 6.75ml
Maggie loves fresh brownies, and her grandma told her if she places a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of Betty Crocker brownies. She places 6 brownies in 6 individual tupperware containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the brownie containers, and leaves the other three alone. Each day for three weeks she measures the moistness of the brownies and records her results. What is the independent variable? What is the dependant variable? What are the constants? Hypothesis? What are the control groups? What is the experimental group?
Answer:
Independent variable - Piece of bread
Dependant variable - Moistness of brownie
Constants- Same size and location of brownie
Hypothesis - IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Control groups- The set of brownie containers she adds no piece of bread to
Experimental group- The set of brownie containers she adds a piece of bread to
Explanation:
The hypothesis in an experiment is a testable explanation to a given problem, which is whether a piece of bread can make brownie moist in this question. Hence, a possible hypothesis will be: IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Independent variable is the variable that the experimenter changes or manipulates in the experiment. In this case, the independent variable is the PIECE OF BREAD added to the brownie.
The dependent variable is the variable that is being measured in an experiment. The dependent variable in this case is the MOISTNESS of the brownie
Constants are variables that the experimenter keeps unchanged for all the groups throughout the experiment. In this case, the constants are SAME SIZE AND LOCATION OF BROWNIE.
Control group is the group that does not receive the experimental treatment or independent variable while the experimental group is the group that receives the experimental treatment. The control group in this experiment is: The set of brownie containers she adds no piece of bread to, while the experimental group is the: The set of brownie containers she adds a piece of bread to
Why doesn’t the temperature of an object constantly rise as you add more and more kinetic energy?
Given the reaction for the nickel-cadmium battery: 2NiOOH + Cd +2H2O -> 2Ni(OH)2 + Cd(OH)2 What species is oxidized during the discharge of the battery?
Answer:
Cd is oxidized during the discharge of the battery
Explanation:
Based on the reaction:
2 NiOOH + Cd + 2H₂O → 2Ni(OH)₂ + Cd(OH)₂
And knowing Oxygen and hydrogen never change its charge, we must to find oxidation state of Ni and Cd before and after the reaction:
Ni:
In NiOOH: 2 O = -2*2 = -4 + 1H = +1, = -4 + 1 = -3. And as the molecule is neutral, Ni is 3+
In Ni(OH)₂: OH = -1. As there are 2 OH = -2. That means Ni is +2
The Ni is gaining one electron, that means is been reduced
Cd:
Cd before reaction is as pure solid with oxidation state = 0
Cd after the reaction is as Cd(OH)₂: 2 OH = -2. That means Cd is +2
The Cd is loosing 2 electrons, that means is the species that is oxidized.
How many lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO3-)?
Answer: 8
Explanation: just took the mastery test
The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. Therefore, eight lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO₃⁻).
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.
3 oxygen (O) atoms and a nitrogen (N) atoms make up basic Lewis dot of a nitrate [NO₃]⁻ ion. The molecular ion has a nitrogen (N) atom in its core and three oxygen (O) atoms, one on each side, at terminal positions.
Therefore, eight lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO₃⁻).
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Iron has a density of 5.5 g/mL. What would be the volume of a 1500 g sample?
Answer:
volume = 272.7 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{Density} [/tex]
From the question
mass of Iron = 1500 g
Density = 5.5 g/mL
Substitute the values into the above formula and solve
That's
[tex]volume = \frac{1500}{5.5} \\ = 272.727272...[/tex]
We have the final answer as
volume = 272.7 mLHope this helps you
Hey student made a model of a river in a sandbox a pile of sand represents soil and bits of rocks in the riverbed water pouring from 100% river water as it flows downhill which two characteristics are limitations of the students model
Answer:
The model is missing plants, fish and other details found in a real river
The model is much smaller then a real river
Explanation:
Answer:
The model is missing plants, fish and other details found in a real river
The model is much smaller then a real river
Explanation:
Write in standard notation 6.078 x 10 expo 3
Answer:
6078
Explanation:
Which of the following means a natural occurring solid that has a specific chemical makeup?
A. Rock
B. Mineral
C. Erosion
Answer:
mineral
Explanation:
Because every natural thing has mineral
Examine the data table below. Most adult sparrows have a wing span falling into which of the following ranges?
Adult Sparrows Measured
Answer:
19-24 cm
Explanation:
Answer:
the answer is 19-24 cm
Explanation:
i did the study island
Please help, urgent!! Will give extra points, thank you so much!!
Answer:
1.proton
2.nucleus
3. electrons
4.nucleus??
5. protons and neutrons
6. electrons
7.neutrons
Explanation:
In DNA replication, what is the leading strand? A. the strand that is unzipped at the replication fork B. the strand that assembles new nucleotides in a continuous fashion C. the strand that does not assemble new nucleotides in a continuous fashion D. the strand that waits for the DNA replication process to be finished
Answer:
B
Explanation:
Answer: B.) the strand that assembles new nucleotides in a continuous fashion
Explanation: edgenuity
Behold a mixture of oily/hydrophobic (yellow) and water (purplish) molecules. recall that hydrophobic regions are ones with few or no partial charges--so there's nothing for water's hydrogen interaction donors or acceptors to 'play with'. so! how many of the water molecules are 'stuck' contacting at least part of a hydrophobic molecule in this arrangement?
Answer:
about 40
Explanation:
In the attached diagram, there are 5 hydrophobic molecules show, each of which has 9 water molecules shown around it. There are "about 40" water molecules 'stuck' to the hydrophobic molecules.
How can a new element be made?
Answer:
You have to change the number of protons in the nucleus. While it is possible, it requires bombarding and putting together elements, which creates high energy particle accelerators.
In the reaction glucose + fructose → sucrose + water, __________ is a reactant and __________ is a product.
Answer:
glucose + fructose is a reactant, sucrose + water is a product
Explanation:
The first part of the equation is a reactant(s), and the other part of the equation is the product(s).
Is 500mL greater than 5L
What is the first step in cell division?
Answer:
prophase,
Explanation:
during which the nucleus dissolves and the chromosomes begin migration to the midline of the cell.
The first step of cell division is known as prophase, during which the nucleus dissolves and the chromosomes start the migration to the cell.
What is cell division?Cell division can be described as the process by which a parent cell divides into two daughter cells. Cell division takes place as part of a cell cycle in which the cell grows and replicates chromosome(s) before dividing.
In eukaryotes, there are two types of cell division: a vegetative division (mitosis), producing daughter cells genetically similar to the parent cell, and a cell division that forms haploid gametes for sexual reproduction (meiosis), decreasing the number of chromosomes from two of each kind in the diploid parent cell to one of each kind in the daughter cells.
The phases of cell division are interphase, Prophase, Metaphase, Anaphase, Telophase, and Cytokinesis.
In the Prophase, the nuclear envelope will be broken down and chromatin condenses to produce shorter more visible strands known as chromosomes.
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A gold-colored ring has a mass of 17.5 grams and a volume of 0.82 mL. What is the density of this ring?
Answer:
21 g/mL
Explanation:
To solve this problem, first look at the density equation, which is D=M/V, which D stands for density, M stands for mass, and V stands for volume. When you substitute in the variables, you get D=17.5/.82, which is equivalent to 21.34. However, since we need to pay attention to the sig fig rules for multiplying, we need to have the same amount of sig figs as the value with the least amount of sig figs, which is the number .82. .82 has two sig figs, so you round down. Your answer will be 21 g/mL.
Which of the following is not likely to appear on a map?
A. Remote sensors
B. compass rose
C. contour lines
D. latitude lines
E. the equator
The density of aluminum is 2.70 g/cm3. What is the mass of 235 cm3 of aluminum?
634.5 g
635 g
635 g/cm3
634.5 ml
Answer:
JUST B
Explanation:
carbon + oxygen= carbon dioxide ( give me answe)
Answer:
C+O2=CO2
Explanation:
During combustion the reaction is formed.
why do living things need water, food, and space
living thing need water to survive
and food to get energy and perform life processes.
and living organism need space to gets the energy and materials it needs
What are the favourable condition
the formation of ionic bond?
for
Answer: Favourable conditions for the formation of ionic bond are low ionization energy of metal and high electronegativity of non-metal.
Explanation: An ionic bond is defined as the bond formed due to transfer of one or more number of electrons from one atom to another.
Answer: Favourable conditions for the formation of ionic bond are low ionization energy of metal and high electronegativity of non-metal. Explanation: An ionic bond is defined as the bond formed due to transfer of one or more number of electrons from one atom to another
hope this helps, sorry if im off
What is the formal charge of i in icl4
Answer:
Explanation:
in the Lewis structure of ICl4- there are total of 36 valence electrons. Since Iodine (I) is below Period 3 on the periodic table it can hold more than 8 electrons. ... Also note that you should put the ICl4- Lewis structure in brackets with as 1- on the outside to show that it is an ion with a negative one charge.
The formal charge present on the iodine atom of ICl₄ is -1.
How do we calculate formal charge?Formal charge on any atom present in any compound will be calculated by using the below formula:
Formal Charge = (No. of valence electrons in neutral atom) - 1/2 (No. of electrons in covalent bond) - (No. of electrons in lone pair)
In the structure of ICl₄, 4 covalent bonds are present and for iodine atom no. of valence electrons in iodine is 7 and lone pair present on iodine is 2 means 4 electrons of lone pair is present. Structure is shown in the attached image.
On putting these values we get,
Formal charge = 7 - 1/2(8) - 4 = -1
Hence in iodine atom -1 charge is present.
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How to prevent environmental hazards?
Answer:
by throwing away or recycle
Explanation: