Explanation:
Note: Molar masses of elements can be found online or in the periodic table.
Moles of Magnesium
= 3.60g / (24.3g/mol) = 0.148mol.
Moles of Chlorine
= 10.65g / (35.45g/mol) = 0.300mol.
Mole ratio of Magnesium to Chlorine
= 0.148mol : 0.300mol = 1 : 2.
Hence we have the empirical formula MgCl2.
Moles of Lithium
= 9.1g / (6.94g/mol) = 1.311mol.
Moles of Oxygen
= 10.4g / (16g/mol) = 0.650mol.
Moles ratio of Lithium to Oxygen
= 1.311mol : 0.650mol = 2 : 1.
Hence we have the empirical formula Li2O.
What is the best way to measure the age of the Earth and why? Explain how scientists do this.
Explanation:
the best way to understand the age of the earth is to estimate the age of matirials in it
What does the term "resolution" mean
Answer:
there's two
Explanation:
resolution means:
a decision to do or not to do something
resolution also means:
the quality of being determined
TIME REMAINING 52:03 Considering the activity series given below for metals and nonmetals, which reaction will occur?
Al > Mn > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag > Pd >Hg > Pt F > Cl > Br > I
2NaBr + I2 Right arrow. 2NaI + Br2
2Fe + Al2O3 Right arrow. 2Al + Fe2O3
2AgNO3 + Ni Right arrow. Ni(NO3)2 + 2Ag
Pb + Zn(C2H3O2)2 Right arrow. Zn + Pb(C2H3O2)2
Answer:
2NaBr + I2 Right arrow. 2NaI + Br2
2AgNO3 + Ni Right arrow. Ni(NO3)2 + 2Ag
Explanation:
The activity or electrochemical series is an arrangement of elements according to their order
of reactivity.
If we look at the reactions, one thing that we must note is that the reactions that can occur are those in which an element that is higher in the series displaces another element that is lower in the series.
Br is higher in the electrochemical series than I so it can displace it. Ni is higher than Ag in the electrochemical series hence it can displace it.
Answer: c
Explanation: Edge2021
PLS HELP! BRAINLIEST IF RIGHT WITH EXPLANATION :)
Answer:
I'm going to have to go with double displacement. Sue me if I'm wrong.
Explanation:
Synthesis? No. There would have to be one product, not two.
Decomposition? No. There would have to be one reactant, not two.
Single displacement? No. There are two elements/compounds that are switching places.
Double displacement? Highly likely. From the reactants' side to the products' side, nitrate and iodine switch places.
Neutralization? Uh, I don't think so. I can't remember why, though.
Combustion? No. O₂ would have to be one of the reactants.
Lead nitrate + potassium iodide(?) ==> lead iodide(?) + potassium nitrate
Which statement is true regarding a catalyst?
A). A catalyst increases the activation energy for a chemical reaction.
b). A catalyst decreases the difference in energy for a chemical reaction.
c). A catalyst allows the reactants to start at a higher energy level.
d). A catalyst lowers the activation energy for a chemical reaction.
Answer:
d). A catalyst lowers the activation energy for a chemical reaction.
Explanation:
From the given choices, it is true that a catalyst lowers the activation energy for a chemical reaction.
The activation energy is the energy barrier that must be overcome before a chemical reaction can occur.
Some reactions have very high activation energy and would not occur without the introduction of a catalyst.
The catalyst brings the reactants into contact by removing the energy deficiency in the system.
What region of the periodic table contain atoms that form covalent bonds?
A. Right side
B. Bottom left side
C. Middle
D. Top left side
Answer:
A. the right side
Explanation:
Taking into account the definition of covalent bond, the correct answer is option A.) right side of the periodic table contain atoms that form covalent bonds.
The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The shared electron pair is common to the two atoms and holds them together.
In other words, a covalent bond is a force that joins two atoms of non-metallic elements to form a molecule. Atoms share pairs of electrons from their valence shell to achieve the stability of the molecule formed. The tendency of the elements to reach a stable configuration is known as the octet rule.
Finally, since the nonmetallic elements are found on the right side of the periodic table, the correct answer is option A.) right side of the periodic table contain atoms that form covalent bonds.
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Which model shows 5 electrons in the outer shell of the atom?
A.2
B.3
C.4
D.1
Answer:
D
Explanation:
there are 5 electrons in the outer shell of the first picture
According to electronic configuration, model 1 shows 5 electrons in the outer shell of the atom.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Explain when and why parentheses are necessary when writing chemical formulas that include
polyatomic ions. Provide an example with your explanation. Make sure to discuss how removing the
parentheses from your example would change the readers understanding of the formula.
Answer:
- the 2 in this formula is called the subscript. It refers only to the element preceding it. In this case the F (fluorine).
- in some chemical formulas it is necessary to use parentheses. The subscript outside the parentheses refers to all the elements inside the parentheses. In this example there are: one Al (aluminum), three N (nitrogen), and nine O (oxygen).
- the 3 in this formula is called the coefficient. It refers to each element that follows. In this case there would be 3 Ba (barium) and 3 F2 (a total of 6 fluorine).
Explanation:
What is the molarity of a solution
made by dissolving 18.9 g of
ammonium nitrate (NH4NO3) in
enough water to make 855 mL of
solution?
Molar Mass N: 14.01 g/mol
Molar Mass H: 1.008 g/mol
Molar Mass O: 16.00 g/mol
Answer:
Molarity = 0.28 M
Explanation:
Given data:
Mass of NH₄NO₃ = 18.9 g
Volume of solution = 855 mL (855mL × 1 L/1000 mL = 0.855 L)
Molarity of solution = ?
Solution:
Number of moles of NH₄NO₃:
Number of moles = mass/molar mass
Number of moles = 18.9 g/ 80.043 g/mol
Number of moles = 0.24 mol
Molarity:
Molarity = number of moles of solute / volume in L
Molarity = 0.24 mol /0.855 L
Molarity = 0.28 M
Answer:
0.28
Explanation:
:D
What element am I if I have 6 protons and
8 neutrons?
Answer:
The element you would have is Carbon-14.
Explanation:
Carbon-14 has 6 protons and 8 neutrons. To find the atomic mass, you add the protons to the neutrons, so the atomic mass of Carbon-14 is 14.
#teamtrees #WAP (Water And Plant)
What does it mean when you ask your dad whats he going to do with the chikens and hes says feed them some fried chiken?
Answer:
It means your dad is making those chickens cannibal's.......
Explanation:
Answer:
Hes gonna cook those chickens.....
What is the correct name for a compound with two iron atoms and three oxygen atoms?
iron(II) oxide
iron(I) oxide
iron(III) oxide
iron(3) oxide
PLEASE HELP ASAP
Answer:
iron(lll)oxide
Explanation:
has three oxygen atoms
The correct formula for the compound is iron(III) oxide with two iron atoms and three oxygen atoms. Therefore, option (3) is correct.
What is iron(III) oxide?Fe₂O₃ is an inorganic compound that has the chemical name Iron(III) oxide. Iron(III) oxide is also known as Hematite or Red iron oxide. This compound is naturally found in rocks of all ages. It is odorless, appears as a Red-brown solid, and has a pH value of 7.
Iron (III) oxide also called ferric oxide, is formed by the oxidation of iron. This can be prepared by electrolyzing a sodium bicarbonate solution in the laboratory, with an iron anode. The hydrated iron(III) oxide obtained which is dehydrated at around 200 °C.
The oxidation state of iron can be calculated as oxygen has an oxidation number of -2.
2x + 3(-2) = 0
2x = 6
x = +3
Therefore, the chemical formula Fe₂O₃ has the name Iron(III) oxide.
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hi can you pls help :)
Answer:i think it is c, it explodes in water because that’s a chemical reaction
Explanation:
How many more electrons than lithium does an atom of sodium have?
Answer:Each lithium atom provides one. You can see that the oxygen atom has eight electrons (6 of its own, and one from each lithium), and the two lithium atoms have two electrons each.
Explanation:
PLZ ANSWER ASAP!! BRAINLIEST IF RIGHT WITH EXPLANATION! :)
Answer:
Combustion
Explanation:
Naphthalene
The burning of naphthalene is one of the more well known school experiments for combustion reactions. This is because naphthalene combustion involves a simple burning reaction which involves simple burning procedures. The reaction involved is represented by the reaction equation: C10H8 + 12 O2 → 10 CO2 + 4 H2O + energy.
In layman's terms, Naphthalene plus oxygen will burn, and produce carbon dioxide and water. This exothermic reaction that involves releasing heat in the form flame and also produces carbon dioxide gas.
Once we use up all the nonrenewable Energy sources they cannot be replenished.
O True
O False
Answer:
true
Explanation:
it says none renewable so you can't reuse it
Answer:
false
Explanation:
becuase nonrenewable means it can not be replenished
Which of the following elements is the least electronegative?
A. NA
B. Al
C. Cl
D. Si
Answer:
na
Explanation:
gggggggggggggggggggggggggg
Cl (chlorine) ion is negatively charged.
Which has a greater momentum: cheetah with a mass of about 74 kg and a running speed of up to 31 m/s, or an elephant with a mass of 7000 kg running at 18 km/hr?
help im gonna diee....*^*
Answer:
i say the elephant
Explanation: mainly because its heavier!
When plant cells make food, they transform________________ into ________________
Answer:
Carbon dioxide into energy
Explanation:
Plants are autotrophs and prepare their own food through the process of photosynthesis. During the process of photosynthesis, plants utilizes, carbon dioxide and water in the presence of sunlight and produce energy and oxygen.
Plants cell during photosynthesis, uses carbon dioxide and transform it into energy in the form of glucose and releases oxygen.
Hence, the correct answer is "Carbon dioxide into energy".
What does percent composition tell you about a substance?
O
A. It gives you the molecular formula of the substance,
B. It tells you what the substance is made of
O C. It gives you the total mass of the substance,
OD. It tells you how many moles are in the substance,
Answer:
Percent composition tells you which types of atoms (elements) are present in a molecule and their levels. Percent composition can also tell you about the different elements present in an ionic compound as well.ion:
Answer:
Explanation:hey
Hi does anyone have the data table answers for the Charles Law Lab Report from Edge?
Answer:
Last Column is:
Explanation:
98 , 7.8 , 371 and 0.98
1. What is the name for the material that stacks around the edges of impact craters on the moon?
basaltic lava
maria
regolith
ejecta
Answer:
regolith
Explanation:
PLEASE HELP FAST!!! 50 PTS PLUS BRAINLIEST
Convert the following:
0.0087 micrograms = ______ centigrams
87,000,000
becuase itis
Part C
Why do you use the same amount of baking soda and same amount of liquid for each combination?
Answer:
because you might have a too much bigger than explosion if you add more baking soda or vinegar
Explanation:
You use the same amount of baking soda and the same amount of liquid for each combination for the explosion.
We know that,
When you use the same amount of baking soda and the same amount of liquid for each combination then be get the explosion.
Baking soda and liquid are base and acid so they react chemically.
Here, the given liquid is vinegar
If you will increase the amount of baking soda and if you will increase the amount of liquid then no reaction
So, you use the same amount of baking soda and the same amount of liquid for each combination for the explosion.
Reference:
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h) Given that the boiling point of substance X is around 105°C. Why can't we
use water bath to determine the boiling point of substance X?
Answer:
because the boiling point of water is 100°C the water bath would boil before the substance
Alex's teacher showed him a model of gas particles in a sealed container. How should Alex change the model to show the particles of this gas at a higher temperature?
Answer:
Increased volume of particles in the containergreater vibration of particlesExplanation:
At higher temperature, the particles of the gas would be more active and vibrate more, or even have greater collisions. Alex can indicate this in the altered model to depict higher temperature.
Consequently, Charles law gives meaning to why there would be an increased volume of gas in the stable pressurized container, if the temperature were to be increased.
I hope this explanation was clear and concise?
Please i’ll give brainliest uwu
what type of potential energy do fuels contain
Answer:
It contains chemical potential energy.
Explanation:
6
The
force between each planet and the Sun keeps the planets in orbit around the Sun.
OA.
frictional
OB magnetic
OC.
gravitational
OD.
nuclear
Reset
Next Question
Answer:
oc gravitaional
Explanation:
Need help in these 2 questions
Answer:
1 = 7.5m/s and 2 = 8m/s
Explanation:
For question no. 1
Given
wavelength = 5 m
Frequency = 1.5 Hz
Velocity =?
We have the formula that
Velocity = wavelength * frequency
= 5 * 1.5
= 7.5 m/s
For question no. 2
Frequency = 2 Hz
Wavelength = 4 m
Velocity = ?
We have the formula that
Velocity = wavelength * frequency
= 4* 2
= 8 m/s
Hope it will help :)
Answer:
1. 7.5m/s
2. 8m/s
Explanation: velocity = Wavelength x Frequency so 5m*1.5Hz=7.5m/s and 2Hz*4m=8m/s
