Answer:
D
Explanation:
calicium exchange valency of 2 with 1 valency of chlorine
Which sublevel contains valance electrons in an atom of magnesium (mg)?
A. 2s
B. 2p
C. 3s
D. 3p
What is the oxidation state of each element in the compound CaSO4?
What happens to the electric force between two particles if the distance
between them is doubled?
Answer:
The size of the force varies inversely as the square of the distance between the two charges. Therefore, if the distance between the two charges is doubled, the attraction or repulsion become weaker, decreasing to one-fourth of the original value. ...The size of the force is proportional to the value of each charge.
please help bbg'sssss
Answer:
Explanation:
from the way the trees look, i would say A: Wind from the sky, it seems B: Clouds and in the distance C:Precipitation(rain)
3. Pretend you're a farmer and you want to grow more crops. You have three different
fertilizers to choose from. Design an experiment that will help you choose which
fertilizer is best.
a. What variables would you need to control in your experiment?
b. Which variable would you change to test the fertilizers?
C. What is the measurable data point for this experiment?
d. What would the procedure be for your experiment?
Answer:
A
Explanation:
The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. What can be said about the coils when they are accepting the heat inside the house?
Answer:
c
Explanation:
Answer:
B: They must be cooler than the air inside the house.
Explanation:
I got it right on edge!
How do hydrogels retain water?
Answer:
The combination of the polymer opening up and the water molecules sticking to it make a solution of the hydrogel get thicker and more viscous (sticky). Disposable nappies make use of the ability of hydrogels to take up and retain water, even under pressure.
Explanation:
Fe2O3 (s) + CO (g) -> Fe(s) + CO2 (g) (unbalanced)
1.Calculate the number of grams of CO that can react with 0.150kg of Fe2O3
2. Calculate the number of grams of Fe and the number of grams of CO2 formed
when 0.150 kg of Fe2O3 reacts
Answer:
1. 78.9g of CO
2. 104.9g Fe and 124.0g CO2
Explanation:
Based on the balanced reaction:
Fe2O3 (s) + 3CO (g) -> 2Fe(s) + 3CO2 (g)
1 mole of Fe2O3 reacts with 3 moles of CO to produce 2 moles of Fe and 3 of CO2
1. The moles of 0.150kg = 150g of Fe2O3 -Molar mass: are:
150g * (1mol / 159.69g) = 0.9393 moles Fe2O3
Moles CO:
0.9393 moles Fe2O3 * (3mol CO / 1mol Fe2O3) = 2.818 moles CO
Mass CO -Molar mass: 28.01g/mol-:
2.818 moles CO * (28.01g/mol) = 78.9g of CO
2. The moles of Fe produced are:
0.9393 moles Fe2O3 * (2mol Fe / 1mol Fe2O3) = 1.8786 moles Fe
Mass Fe -Molar mass: 55.845g/mol-:
1.8786 moles Fe * (55.845g/mol) = 104.9g Fe
The moles of CO2 produced are:
0.9393 moles Fe2O3 * (3mol CO2 / 1mol Fe2O3) = 2.818moles CO2
Mass CO2 -Molar mass: 44.01g/mol-:
2.818moles CO2 * (44.01g/mol) = 124.0g CO2
Does a reaction involving an acid and a base have to take place in a water environment? Justify your answer.
Answer:
Yes, because the water solvent is better
Explanation:
Hope this helps
Write a balanced equation state the reaction type, and perform the requested stoichiometry: Carbon and hydrogen combine to form
methane. How many grams of carbon would be needed to react with 30.2 grams of hydrogen?
Answer:
C + 2H2 = CH4
Given 30.2g of H2
Find the Moles
Mole =Mass/Molar Mass
Molar Mass of H2 = 1x2 = 2g/mol
Mole = 30.2/2
= 15.1moles of Hydrogen gas.
Now from the balanced equation of Reaction above...
1mole of Carbon reacts completely with 2moles of Hydrogen gas.
"x" moles of carbon with react with 15.1moles of Hydrogen
x = 15.1/2
=7.55moles of carbon.
We now have moles of carbon.
To find mass
Mole =Mass/Molar Mass
Mass = Mole x Molar Mass
Molar mass of carbon = 12g/mol
Mass = 7.55 x 12
Mass = 90.6g of carbon is needed.
N is another unit for mass True or False
Given the reaction at equilibrium:
H2(g) + Cl2(g) → 2HCl(g) + heat
The equilibrium will shift to the right when there is an
increase in
A temperature
B pressure
C concentration of H2(g)
O concentration of HCl(g)
Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction? O sodium hydroxide + water → Sodium + hydrogen O sodium + water → sodium hydroxide + hydrogen O sodium + hydrogen → sodium hydroxide + water O sodium + sodium hydroxide → Water + hydrogen
The word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen.
What is a chemical reaction?A chemical reaction is the process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
According to this question, sodium (Na) and water (H2O) are involved in a chemical reaction to produce sodium hydroxide (NaOH) and hydrogen gas (H2).
Therefore, the word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen
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i need help answering this question on my homework, could anyone help?
1. Ecosystems are composed of biotic and abiotic factors. Which of the following
represent only an abiotic factor in an ecosystem that could have an effect on
the ecosystem?
a. rivers with more dams
b. wood being taken for manufacturing
c. waste not being used by fungi
d. decomposers only taking nutrients from plants
Answer:
wood being taken for manufacturing
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
2HCl → H2 + Cl2
Is synthesis?
Answer:
It's decomposition
explanation:
The correct formula for finding the relative velocity of an object is:
Vac= vah-vыс
Valc = ab + b c
Vad = ab + b c
b c = ab + b c
Answer:
va/c = v a/b + v b/c
Explanation:
This is the correct formula for relative velocity
Which element has their valence electron farthest from the nucleus?
K (Potassium)
Li (Lithium)
Na (Sodium)
Rb (Rubidium)
An ionic substance is formed between a positively charged cation and a negatively charged anion. Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions. Which of the following substances are ionic? Check all that apply. Check all that apply. AlCl3 MgI2 C2H5OH NH3
Answer:
Which of the following substances are ionic?
Check all that apply.
AlCl3
MgI2
C2H5OH
NH3
Explanation:
An ionic substance is formed between a positively charged cation and a negatively charged anion.
Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions.
Among the given substances,
MgI2 is an ionic substance.
Since Mg is the metal atom. It forms a cation.
I is a nonmetal atom. It forms anion.
Hence,
MgI2 is an ionic substance.
Though AlCl3 looks like an ionic substance it is a covalent compound.
This is due to the high polarizability of [tex]Al^3+[/tex] ion.
The remaining two compounds do not contain any metal atoms.
So, ethanol and NH3 are not ionic compounds.
Answer:
MgI2
An Element X has been discovered. Element X forms an Xt ion and
G9 EOT3 2020-
has an atomic number of 11. The X* ion of Element X forms a bond
with CI.
1-3
5.00
11
Na
Mg
3
22.99
19
24.10
20
21
K
Ca
Sc
19.10
400
19
Rb
Sr
Y
NOT
R$ 47
53
N7
so
CS
Ba
3.71
112.91
117 11
Ra
malleable and co
malene bi
Answer: The chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
Explanation:
An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).
The element losing electron (metal) forms a positive ion known as a cation while the element gaining electron (non-metal) forms a negative ion known as an anion.
Element X has the atomic number 11 which is sodium. The electronic configuration of it is [tex]1s^22s^22p^63s^1[/tex]
This element will lose 1 electron to form [tex]X^+[/tex] ion of [tex]Na^+[/tex]
Chlorine has the atomic number 17. The electronic configuration of it is [tex]1s^22s^22p^63s^23p^5[/tex]
This element will gain 1 electron to form [tex]Cl^-[/tex] ion
When these two ions combine, they lead to the formation of an ionic compound having a chemical formula of [tex]XCl[/tex] or [tex]NaCl[/tex]
Hence, the chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
A sample of oxygen gas has volume 150.0 mL, at 0.947 atm, what will be the volume of the gas at 750.12 mm of Hg if temperature remain constant.
Answer:
143.9 mL
Explanation:
Applying,
PV = P'V'................. Equation 1
Where P = Initial pressure, V = Initial Volume, P' = Final pressure, V' = Final volume.
Make V' The subject of equation 1
V' = PV/P'............. Equation 2
From the question,
Given: P = 0.947 atm, V = 150 mL, P' = 750.12 mm of Hg = (750.12/760) = 0.987 atm,
Substitute these values into equation 2
V' = (0.947×150)/0.987
V' = 143.9 mL
How many grams of ammonia (NH3) can be produced by the synthesis of excess hydrogen gas (H2) and 253.8 grams of nitrogen gas (N2) in a synthesis reaction?
Answer:
308.2 g of NH₃.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
3H₂ + N₂ —> 2NH₃
Next, we shall determine the mass of N₂ that reacted and the mass of NH₃ produced from the balanced equation. This can be obtained as follow:
Molar mass of N₂ = 2 × 14 = 28 g/mol
Mass of N₂ from the balanced equation = 1 × 28 = 28 g
Molar mass of NH₃ = 14 + (3×1)
= 14 + 3 = 17 g/mol
Mass of NH₃ from the balanced equation = 2 × 17 = 34 g
Summary:
From the balanced equation above,
28 g of N₂ reacted to produce 34 g of NH₃.
Finally, we shall determine the mass of NH₃ produced by the reaction of 253.8 g of N₂. This can be obtained as illustrated below:
From the balanced equation above,
28 g of N₂ reacted to produce 34 g of NH₃.
Therefore, 253.8 g of N₂ will react to produce = (253.8 × 34)/28 = 308.2 g of NH₃.
Thus, 308.2 g of NH₃ were obtained from the reaction.
The theoretical yield of NH3 is 945 grams. You conducted the experiment and only produced 598 grams.
Answer:
Given theoretical yield of NH3 is 945g.
The actual yield is 598g.
What is the %yield?
Explanation:
%yield of a chemical reaction can be calculated by using the formula:
[tex]%yield=\frac{actual yield}{theoretical yield} * 100[/tex][tex]\frac{actual yield}{theoretical yield} * 100[/tex]
Substitute the given values in this formula to get the %yield.
[tex]\frac{598g}{945g} * 100\\=63.3[/tex]
Hence, the %yield for the formation of ammonia is ---- 63.3.
What is the number of Co2 in a 220 gram
Dos moléculas de Clorato de Potasio en estado sólido, al aplicarle calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso ¿como se representan?
Answer:
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
Explanation:
Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.
Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.
Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.
Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple
What are the two functional group present in the molecule
Answer:
carboxyl group (COOH) and amines
Explanation:
The two functional group present in the shown molecule are carboxylic acid group and amine group.
What are functional groups?Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.
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For an ideal gas, evaluate the volume occupied by 0.3 mole of gas.
Answer:
V=0.3×22.4=6.72 liters hope this helps
PPE 15. What variables are you manipulating in this exercise? Identify a symbol to represent each variable.
WILL GIVE BRAINLIEST - A solution has a [H3O+] of 1 × 10−3 M. What is the [OH−] of the solution?
11 M
14 M
1 × 10−14 M
1 × 10−11 M
Answer:
The answer is 1 x 10 - 11 M. :))
