Answer:
Predictions:
1. Half of the world will be cold and the other half will be hot, which will cause unbalanced state of climate on Earth.
2. The whole world will start to get hotter and there will be no winters or rain which causes water shortage, unable to grow crops. Polar ice is melting is an example.
3. Floods can come, because water level in sea is rising and it could kill all of us.
4. Earthquake can occur because in the Bible Jesus tells about earthquakes, etc at the second coming of Jesus.
Explanation:
4. Calculate AH for the reaction
Ca(OH)2(aq) + 2HCl(aq) → CaCl2(aq) + 2H2O(1)
delta H = ?
Given:
CaO(s) + 2HCl(aq) + CaCl2(aq) + H2O(1) delta H = -186 kJ
CaO(s) + H2O) + Ca(OH)(s) delta H = -62.3 kJ
Ca(OH)2(s) + Ca(OH)2(aq)
delta H = - 12.6 kJ
Answer:
ΔH = -111.1kJ
Explanation:
ΔH of any reaction could be obtained from similar reaction doing algebraic operations. Using the reactions:
(1) CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) ΔH = -186 kJ
(2) CaO(s) + H₂O(l) → Ca(OH)₂(s) ΔH = -62.3 kJ
(3) Ca(OH)₂(s) → Ca(OH)₂(aq) ΔH = - 12.6 kJ
(1) - (2):
Ca(OH)₂(s) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l)
ΔH = -186kJ - (-62.3kJ) = -123.7kJ
This reaction -(3):
Ca(OH)₂(aq) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l)
ΔH = -123.7kJ - (-12.6kJ) = -111.1kJ
ΔH = -111.1kJ
Help please I will give brainliest ASAP
Answer:
2H2S + 3O2 --> 2H2O + 2SO2
2 mol H2S/8 mol H2O = 0.25 mol
Explanation:
Reactants: H is 2; S is 1; O is 2
Products: H is 2; S is 1; O is 3
There are 3 oxygens so add a 2 to the H2O e and 3 to the reactants side.
H2S + 3O2 → 2H2O + SO2
Reactant side: H is 2; S is 1; O is 6
Product side: H is 4; S is 1; O is 4
Hydrogen is now out of balance, so a coefficient of 2 can be placed in front of H2S to give:
2H2S + 3O2 → 2H2O + SO2
Reactant side: H is 4; S is 2; O is 6
Product side: H is 4; S is 1; O is 4
Sulfur is unbalanced, so a coefficient of 2 can be placed in front of SO2 to give:
2H2S + 3O2 → 2H2O + 2SO2
how is bacteria on mars counted as life but a heartbeat on earth is not?
6 Which element requires the least amount of
energy to remove the most loosely held electron
from a gaseous atom in the ground state?
(1) Na
(3) P
(2) Ar
(4) Ci
Answer: 1) Na because it requires least amount of energy.
Na requires the least amount of energy to remove the most loosely held electron.
Why does Na have the least ionization enthalpy among the given elements?Electronic configuration of the elements:Na - [Ne] 3s¹
P - [Ne] 3s² 3p³
Ar - [Ne] 3s² 3p⁶
Cl - [Ne] 3s² 3p⁵
As it can be seen, Na after losing one electron from its outermost subshell attains a stable noble gas configuration. So, it will require a very less amount of energy i.e., ionization enthalpy, to remove that electron.P, which already has a half-filled subshell, will not readily lose the electrons and hence requires more amount of energy.Ar has the noble gas configuration i.e., all its subshells are fully filled. A very large amount of energy will be required to remove its electron.Learn more about ionization energy here:
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Where does the sunlight energy enter from during photosynthesis?
Answer
Through the leaves
Explanation:
Find the mass of 3.66 moles of nitrogen.
Answer:
102.5166Explanation:
Molar mass of N2 = 28.01
3.66 moles x 28.01 grams/mole = 102.5166
Which gas is a greenhouse gas?
Argon
Methane
Nitrogen
Oxygen
Answer:
The answer is Methane
Hope it helped
Answer:
Methane
Explaination:
The main greenhouse gases are:
Water vapor.
Carbon dioxide.
Methane.
Ozone.
Nitrous oxide.
Chlorofluorocarbons.
What is a atmosphere
the metallic compound reduced to the metal by electrolysis is _____
please girls answer, because I think u r always right.
Answer:
Explanation:
u wanted to talk
How much copper is present in a cube that measures 3.20cm on each side, if the density of copper is 8.96 g/mL
Answer:
290.32 g
Explanation:
First we calculate the volume of the cube:
Volume = (3.20 cm)³ = 32.768 cm³Now we convert cubic centimeters to mililiters:
32.768 cm³ * 1 mL / 1 cm³ = 32.768 mLFinally we calculate the mass, using the equation for density:
Density = mass / Volumemass = Density * Volumemass = 8.86 g/mL * 32.768 mL = 290.32 gplease I need help please thanks you
Answer:
m=0
Explanation:
(x1,y1)=(3,0)
(x2,y2)=(−3,0)
hi can you help me with these questions please
Molecular masses
1. CaCo3 (calcium carbon)
2. C6H12O6 (glucose)
3. Fe2O2 (iron oxide 11)
Avogadro's number
1. A sample of iron is known to contain 2.35 mol of Fe. How many iron atoms are there in the sample?
2. how many molecules are present in 150 grams of sulfuric acid (H2SO4)
Molar volume
1. What volume will 110g of dichloro (CI2) occupy when under normal conditions? 2. If you have 600g of CO2 gas and knowing that its molecular mass is 44g / mol, find
a) the number of moles
b) the number of molecules
c) the volume it occupies under normal conditions of pressure and temperature.
Answer:
iron oxide11
Explanation:
iron oxide is the chemical compound with formula fe304. it occurs in nature as the mineral magnetite.
What does it mean if a trait is inherited
Answer:
An inherited trait is one that is genetically determined. Inherited traits are passed from parent to offspring according to the rules of Mendelian genetics.
Explanation:
A substance joined by this type of bond has a low melting point
Answer:covalent bonds
Explanation:
Different measures are used to specify amounts. The store has the same red delicious apples at two pricing options: a) 10 apples for $10.50 b) 3 lb bag of apples for $5.00 What do you need to know before you can select one of the above options?
Answer:
You need to know the weight in lb of 1 apple (or how manly apples there are in a 1 lb bag of apples)
Explanation:
Option a) presents the price for unit of apple: 10 apples for $10.50. So, the price of 1 apple is calculated as $10.50/10 = $1.05
Option b) presents the price for weight of a bag of apples: 3 lb bag of apples for $5.00. So, the price for 1 lb bag of apples is $5.00/3 = $1.66/lb. But we don't know how many apples there are in a 1 lb bag.
If we knew the approximate weight in lb of an apple, we would know how many apples there are in a 1 lb bag and then we can compare with the price for unit (option b vs option a). For example, if there is 1 apple in a 1 lb bag, option b) is more expensive than option a) ⇒ $1.66/apple > $1.05/apple
What is the relationship between the density and position of each Earth layer?
Answer:
The atmosphere and Earth's interior are layered by density. Gravity pulls more strongly on denser materials so denser materials are at the center of things. Earth's core, at its center, is denser than its crust. The lowest layer of the atmosphere is denser than the upper layer.
Hope it helps
Please mark me as brainliest
THank you
Answer:
Gravity pulls more strongly on denser materials so denser materials are at the center of things.
Explanation:
Earths core at its center is denser than its crust the lowest layer of the atmosphere is denser than the upper layer
20 points
Which of the following objects below is NOT needed to test electrical conductivity?
battery
object powered by electricity
insulated wire
electrical tape
Answer:
I`m pretty sure it`s electrical tape.
Explanation:
The objects which does not conduct electricity are called insulators which are not needed to test electrical conductivity. Hence, insulated wire is the correct option.
What is conductivity ?Conductivity of a substance is the ability to conduct electrically or thermally through the substance. Based on their conductivity, there are three classes of materials conductors, semiconductors and insulators.
Conductors are materials conducting heat and electricity at all temperatures. Semiconductors conduct only at higher temperature or on doping. Insulators are material does not conduct at any condition.
Metals are good conductors. Silicon , germanium etc. are semiconductors. Whereas, wood, plastic etc. are insulators they does not allow flow of electrons through it. Therefore, an insulated wire is not needed to test conductivity.
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Chemical energy is contained in the chemical bonds of a substance. True or False
One mole of any gas at 298 K and 1 atm occupies a volume of 22.4 L.
Group of answer choices
True
False
Answer:
false darling
Explanation:
write any three reason for the profuse use of plastic . although it is harmful .
Plssssssssssssssss help me!!!!!
It's due soon!!
It's worth 4 marks about bonding.
Answer:
See explanation
Explanation:
Ammonia is a covalent molecule. We should remember that a covalent molecule is formed by the sharing of electrons.
Now hydrogen has only one valence electron while nitrogen has five valence electrons. Two among these five valence electrons is a lone pair of electrons.
Three hydrogen atoms can share one electron each with all of the available valence electrons in nitrogen to form NH3 with the lone pair of electrons still localized on the nitrogen atom.
NEED ASAP. WILL MARK BRAINLIEST!
1. (06.01 LC)
Based on the kinetic theory, which statement is true? (15 points)
A. The particles of matter are stationary.
B. Matter is composed of very small particles.
C. Matter is made up of only charged particles.
D. The particles of matter have zero kinetic energy.
Answer:
B. Matter is composed of very small particles.
Explanation:
All matter is composed of extremely small particles called atoms. All atoms of a given element are identical in size, mass,
The statement is true based on the kinetic theory is that; "matter is composed of very small particles.".
Kinetic theory of matter
The kinetic theory of matter holds that the particles that compose matter are in constant random motion. In this theory, all matter is composed of molecules.
Now, the statement is true based on the kinetic theory is that; "matter is composed of very small particles.".
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Which phrase explains how a range of fault-block mountains forms? O A. Shear forces cause large earthquakes to happen often and suddenly O B. Tension affects a wide area of crust and causes many normal faults. C. Eruptions of volcanoes cause many reverse faults to happen slowly D. Compression affects a small area of crust and acts for a long period of time.
Answer:
the answer is letter b eruptions
Señala en cuál de los siguientes sistemas puede haber un equilibrio físico dinámico o un equilibrio químico. a. Cristalización y disolución del cloruro de sodio. b. Conversión de oxígeno gaseoso en ozono. c. Condensación y evaporación de un líquido. d. Reacción entre H2 y l2 para producir Hl. e. Una solución saturada de azúcar. por favor, solo me falta esa pregunta.
Answer:
Ver explicacion
Explanation:
Cristalización y disolución de cloruro de sodio: equilibrio físico dinámico
Conversión de oxígeno gaseoso en ozono - equilibrio químico
Condensación y evaporación de un líquido - equilibrio físico dinámico
Reacción entre H2 y 12 para producir Hl - equilibrio químico
Una solución saturada de azúcar - equilibrio físico dinámico
El equilibrio alcanzado en los procesos físicos se llama procesos físicos. El equilibrio físico se llama. Ejemplos de tales procesos físicos incluyen; condensación y evaporación, cristalización y disolución, etc.
Un equilibrio dinámico ocurre en un sistema químico cuando la reacción directa y la reacción inversa se desarrollan a la misma velocidad.
1. Suppose that the volume of a gas in a cylinder is 1.35 L at a pressure of 2.15 atm. What is the new volume if the
pressure is decreased to 1.86 atm? (Temperature and amount of gas remain constant.)
The volume of a gas in a cylinder is 1.35 L at a pressure of 2.15 atm, if the pressure is decreased to 1.86 atm then the new volume is 1.56 L.
What is pressure?Pressure is defined as the force applied perpendicular to the surface of an object per unit area over which the force is distributed.
It can also be defined as the force exerted on a given area.
Pressure can be expressed as
Pressure = force / area
There are mainly four types of pressure
Absolute pressureGauge pressureDifferential pressureVacuum pressureUsing the formula P1V1 = P2V2
As given P1 = 2.15, V1 = 1.35 and P2 = 1.86
So, V2 = P1V1 / P2
= 2.15 x 1.35 / 1.86
= 1.56 L
Thus, the volume of a gas in a cylinder is 1.35 L at a pressure of 2.15 atm, if the pressure is decreased to 1.86 atm then the new volume is 1.56 L.
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1) How many radial seconds are in 80 degree angle?
Answer:
288000 sec
Explanation:
can someone help me please-
i just need some answers-
Answer:
1.Newton's first law is often called the law of inertia.
2.Newton's second law of motion is F = ma
3.An object not wanting to change its speed or direction
4.a bike would have more acceleration
5.it doesn't have auto brakes and its lighter than a motorcycle
6. Second law
7. First law
8. First law
9. Second law
10. First law
Those should be right!
How many per tickets are in one mole?
Answer:
Avogadro's number is a proportion that relates molar mass on an atomic scale to physical mass on a human scale. Avogadro's number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022×1023 mol-1 and is expressed as the symbol NA.
Explanation:
am i correct?????????????????????????????
Answer:
yep you are correct.
Explanation:
A substance joined by this type of bond shares electrons
Answer: Covalent
Explanation:
A covalent compound is formed when an element shares its valence electron with another element. This compound is formed between two non metals. Example: [tex]HF[/tex]
An ionic compound is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal. Example: [tex]NaCl[/tex]