Answer:
Roman numeral notation indicates charge of ion when element commonly forms more than one ion. For example, iron(II) has a 2+ charge; iron(III) a 3+ charge.
Explanation:
What 3 particles make up an atom and what is their electrical charge?
A nuclear power plant produces huge amount of electricity. However, it dumps radioactive wastes into the sea. This has led to an increase in illness among people living along the coast. Which of these is the best method to solve this problem?
Question 1 options:
Convert the nuclear power plant into a hydroelectric power plant which does not produce wastes.
Shift the nuclear power plant to locations far away from the sea.
Increase public awareness to close the nuclear power plant.
Provide the nuclear power plant with a plan to properly dispose of and recycle the wastes.
Answer: Provide the nuclear power plant with a plan to properly dispose of and recycle the wastes.
Explanation:
The nuclear power plant is producing huge amounts of electricity which is beneficial to the economy as it pushes growth. Shutting it down or relocating it is therefore not the right solution.
The problem is the radioactive waste being produced so a solution that is specific to this problem should suffice. That solution would be the provision of the nuclear plant with plans to properly dispose of the waste.
Should this happen, the nuclear plant can still stay in the same area and keep contributing to economic growth without adversely affecting people's heath.
Answer: yup the correct answer is c
Explanation:
Heelllpp ASAP .............
Answer is
Chloromethane
Explanation: because c stand for carbon an the h stands for hydrogen and ci stands for
Chemical ionization
Ricardo is working on a refrigeration system and needs to know the fluid pressure of a water tank. He knows that the tank is 12 in long, 12 in wide, and 12 in high, and holds 1 cubic foot of water. He also knows that the weight of 1 cubic foot of water is approximately 62.4 lb.
What's the fluid pressure?
Answer:
I also have this question but see the 69 page of ur question book
A metallic bond is formed between what two types of elements
Answer:
metallic bonds are defined as those in which metals share valence electrons for example when sodium metallically bonds with itself each atom is sharing the electrons in the third orbital with up to eight other atoms the same thing happens with magnetism or other metals metallically bond to themselves.
What are the respective central-metal oxidation state, coordination number, and overall charge on the complex ion in Na2[Cr(NH3)2(NCS)4]?
A) +3; 6; -1
B) +2; 6; -2
C) +1; 6; -2
D) +3; 6; +1
Answer:
B) +2; 6; -2
Explanation:
In order to know what the coordination number is, all we need to do is to count the number of ligands present in the coordination sphere. Coordination number refers to the number of ligands in the coordination sphere of a given complex. The coordination number here is 6.
The counter ion here is 2Na+. It means that the overall charge on the complex must be -2 because the magnitude of charge on the complex ion is exactly balanced by the number of counter ions.
The charge on the metal (x) must now be;
x + 0 + 4(-1) = -2
x - 4 = -2
x = -2 + 4
x = +2
Note that NH3 is designated as zero because it is a neutral molecule. Each NCS^- ion has a charge magnitude of -1.
Robert makes a glass of tea and takes it outside with him. While outside, the thermal energy within the glass of tea is transferred to its surroundings. Based on this information, what else is happening within the glass of tea?
A.
The kinetic energy of the particles is increasing and the temperature is decreasing.
B.
The kinetic energy of the particles is increasing and the temperature is increasing.
C.
The kinetic energy of the particles is decreasing and the temperature is increasing.
D.
The kinetic energy of the particles is decreasing and the temperature is decreasing.
Answer:
A
Explanation:
i had answer it and it was A
Don’t know need the anwser !!DUE MONDAY!!
Answer: The distance is slightly less than 3.5 m
Explanation: assuming wall and target are the same thing, and the bullet has constant velocity, the bullet will travel 7 m in half a second, so half that distance is 3.5 m.
In reality, the bullet is decelerating (at an unknown rate) so the distance is slightly less than 3.5 m.
There is also a vertical velocity component, which means it hits the target/wall at an angle. The trajectory is such that it hits the wall above the shooter because the ricochet hits at ~the level at which it left the firearm.
If the wall was absent, the bullet would have described a parabola which brough it back to the initial level after 7m. This could be calculated, but it means that the actual distance between the shooter and the wall is slightly less than 3.5 m
In addition, the collision with the wall is not 100% elastic, so the velocity aftercthe ricochetvis further reduced.
A calculation would be complex because these confounding factors are not completely independent of each other, but all reduce the average velocity and therefore the distance.
Therefore it is only possible to say that the distance was somewhat less than 3.5 m
Describe how the periodic
table is organized and how
that organization increases
its usefulness (hint: think
about how the position of an
element in the table matters)
Answer:
Elements in the periodic table are arranged according to the increasing atomic number.
We can predict the chemical properties of an element by looking at it's position in the periodic table.
How do you draw the Lewis structure of compound with an ionic bond
Answer:
[Na]^+ [Cl]^-
Explanation:
Lets say its sodium, its number of electrons is 11, but when its stable (an ion), it is 10. and chloride, number of electrons is 17, but when its stable (an ion) it is 18. So the lewis structure for that is, remember with the straight brackets (not sure what it's called, but you know what I mean I guess) its this one: [ ]
Sodium will be + because it has more protons (11-10 = +1), and chloride will be - because it gained an electron, so has more electrons than protons (17-18 = -1)
So the lewis structure would be:
[Na]^+ for sodium
and
[Cl]^- for chlorine
Sodium chloride:
[Na]^+ [Cl]^-
Also just to add, only 1 of each atom (Na and Cl) was needed for the bonding, but if let's say example; 2 Cl was needed to bond with sodium, there would be 2 Cl (same) and 1 Na.
You want to measure the volume of a gold bracelet. For this purpose, a specimen with 20 mL of water is available; when inserting the bracelet, the water level rises to 25 mL. If the density of gold is 19300 Kg/m3. What will be the mass of the bracelet?
Answer:
volume of bracelet is 5cm3
mass is 0.0965Kg
Explanation:
1ml = 1cm3
1m3 = 1000000cm3
0.000005m3
Mass = volume*density
19300 Kg/m3 * 0.000005m3 = 0.0965Kg
In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium sulfide?
A. one
B. two
C. three
D. four
E. none
Answer:
E.none
Explanation:
because the bonds join with each other and no lone pair is left
How many moles are in 3.4 x 10-7 grams of Silicon dioxide, SiO2?
Answer:
Number of moles = 0.057 × 10⁻⁷ mol
Explanation:
Given data:
Mass of SiO₂ = 3.4 × 10⁻⁷ g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of SiO₂ = 60 g/mol
by putting values,
Number of moles = 3.4 × 10⁻⁷ g / 60 g/mol
Number of moles = 0.057 × 10⁻⁷ mol
why do chemist synthesize polymers in the lab?
The reason why chemists synthesize polymers in the lab is;
because of the need to perform and observe the results of a variety of synthesized polymer reactions and to predict when a reaction will happen.
Polymers are simply defined as a substance or material made up of long repeating chemical chains of molecules.
Now, polymer synthesis is simply called polymerization and it is the process by which smaller molecules called monomers undergo covalent bonding to form a longer polymer chain.
Now, from the definition above, the reason why chemists synthesize polymers in the lab is because of the need to perform and observe the results of a variety of synthesized polymer reactions and to predict when a reaction will happen.
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What is the concentration in mol L-l of a 12% solution of tetrahydrate magnesium chloride (MgCl2)?
Mg = 24.31 g mol-1
Cl = 35.45 g mol-1
H = 1.01 g mol-1
O = 16.00 g mol-1
The concentration in mol L-l (M) = 0.717
Further explanationGiven
12% solution of tetrahydrate magnesium chloride (MgCl₂)
Required
The concentration
Solution
Tetrahydrate magnesium chloride (MgCl₂)⇒MgCl₂.4H₂O
MW = Ar Mg+2. Ar Cl+8. Ar H + 4. Ar O
MW=24.31 + 2 x 35.45 + 8 x 1.01 + 4 x 16
MW=24.31+70.9+8.08+64
MW=167.29 g/mol
12% solution = 12 % m/v = 12 g in 100 ml solution
For 1 L solution :
[tex]\tt \dfrac{1}{0.1}\times 12~g=120~g[/tex]
The concentration in g/L = 120 g/L
Convert grams to moles :
[tex]\tt mol=\dfrac{120}{167.29}=0.717[/tex]
A compound has an empirical formula of
CHN. What is its molecular formula, if its
molar mass is 135.13 g/mol?
(C=12.01 amu, H=1.008 amu, N=14.01)
A
B
C5H5N5
CG HONG
Explanation:
Given -
molar mass = 135.13 g/mol
To Find -
molecular formulaSolution:
we know that -
molecular mass = n × empirical massSo,
Here empirical mass =
12.01 + 1.008 + 14.01 = 27.028
Then,
135.13 = n × 27.028
n = 4.99 ≈ 5
We know that,
molecular formula = n × empirical formulaThen,
molecular formula = 5(CHN)
= C₅H₅N₅
Therefore,
Option A is correct✔
PLEASE HELP WILL GIVE BRAINLIEST
Answer: B
We use stoichiometric amounts of P4 and PH3
NO.9) It's actual yield
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation:
(
)O2 → (
)O3
Answer:
3
2
Explanation:
3O2 => 2O3
the equation is balancing
Which of the following would be most useful in trying to obtain procedural information to replicate an experiment previously published?
Answer: Peer-reviewed journal article is the most useful because the information in them had been carefully scrutinized and aproved by people who are experts in that particular field.
Choose all the right answers.
Why do all machines lose some energy while they operate?
They run out of fuel.
Some heat radiates out.
Moving parts cause friction.
High pressure gases move the piston.
Answer:
They run out of fuel
Some heat radiates out
High pressure gases move the piston
What is the definition of a chemical bond?
(A) a mutual repulsion between the nuclei and electrons in two different atoms
(B) a mutual attraction between the nuclei and electrons in two different atoms
(C) a mutual attraction between the nuclei and electrons in a single atom
(D) a mutual repulsion between the nuclei and electrons in a single atom
Answer:
B
Explanation:
bonding is a process of two different atoms sharing electrons for stability and these electrons are attracted by one atom losing it's electrons to another
Rosie balanced the equation below with the lowest coefficients, however she made a mistake.
2 AgCl + 2 Mg(NO3)2 --> 1 AgNO3 + 2 MgCl2
What was her error and what should the correct answer be?
Answer:
2 AgCl + Mg(NO3)2 --> 2AgNO3 + MgCl2
Explanation:
This is balanced equation
An object with a
mass of 7 g and a
volume of 10 mL is
most likely what
substance?
Answer:
Ethanol
Explanation:
Given parameters:
Mass of the object = 7g
volume of the object = 10mL
Unknown:
The kind of substance it is = ?
Solution:
Since from the parameters, we can determine the density of the object. Density is an intensive property of substances.
So, we simply find the density and check a density table for the type of substance it is.
Density is the mass per unit volume.
Density = [tex]\frac{mass}{volume}[/tex]
Let us take the volume to cm³;
10mL = 10cm³
Density = [tex]\frac{7}{10}[/tex] = 0.7g/cm³
This is most likely ethanol
17. What is the correct empirical formula for H4C408?
A
H2C204
B HCO2
C
HCO4
D
H2C202
Answer:
B
Explanation:
by simlfying it you get HCO2
15
Question 56 (1 point)
What is the name of the compound with the chemical formula SnSnO3?
Answer: sodium sulfite
Explanation:
What happens to a rock formation that undergoes a repeated and frequent freeze and thaw cycle of water?
Answer:
Water from melting snow or rainfall infiltrates into cracks in rocks. ... As this process of freezing and thawing happens repeatedly, the rock begins to weaken and eventually breaks apart into angular fragments.
Explanation:
Water melting from snow or rainfall which infiltrates into cracks in rocks, this is repeated process of freezing and thawing, the rock begins to weaken and eventually breaks apart into angular fragments.
What are types of rock layers ?A rock can be formed due to the aggregation of mineral constituents in the earth’s crust and it can be classified is based on different factors like Geological classification, Physical classification, Chemical classification.
Geological classification can be either Sedimentary rock formed by the deposition of sediments by the weathering of pre-existing rocks and it can be carried out by various agents like water, wind, gravity, etc.
Igneous rocks formed by the solidification of magma below the earth’s surface which is held together below the earth’s surface and unable to descend, when these magma cools down and solidifies into igneous rocks.
Learn more about rock layer, here:
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Elisa feels tired because she has a condition that affects whether the right molecules are getting to her cells. If her body were functioning correctly, this is what would happen with oxygen:
Answer:
It would be working properly and providing her energy for her daily activities.
Explanation:
Hello!
In this case, since her oxygen is actually working properly, it is going to be travelling throughout her entire body (via blood) and therefore carbon dioxide would be released as the exhalation product due to cellular respiration carried out in the alveoli which provides energy for her daily activities.
However, the intrusion of different molecules to oxygen into her cells may affect the rate at which cellular respiration is carried out and therefore she may feel tired because such process provides energy to the body.
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Which is a pure substance?
They are chemically bonded together.
They can be classified as pure substances.
They have fixed ratios between their components.
They can be separated by physical processes.
Answer: C. They have fixed ratios between their components.
Two models of the same compound are shown.
On the left labeled Model A 2 large overlapping black spheres with 3 small blue spheres overlapping the rear black sphere and 2 medium red spheres overlapping the front black sphere. One of the red spheres has a small blue sphere overlapping it. On the right labeled Model B 2 C's connected by a black line. The C on the left has 3 H's attached by 1 black line each and the C on the right has 2 Os attached to it. The top O is attached by 2 black lines and the bottom O by 1 black line. The bottom O also has an H attached to it by 1 black line.
In what way is Model A better than Model B?
Model A shows the types of elements in the compound, but Model B does not.
Model A shows the total number of atoms in the molecule, but Model B does not.
Model A shows the three-dimensional shape of the molecule, but Model B does not.
Model A shows the number of atoms of each element in the molecule, but Model B does not.
Answer: C. Model A shows the three-dimensional shape of the molecule, but Model B does not.
Explanation:
i took the test and it makes the most sence for the modeles.
as we go down a group
the number of valence electrons?
a Increases
b Decreases
C Remains the same
d None of the above
Answer:
Number of valence electrons stays the same
remains the same
it remains teh same