Answer:
57.0kJ/mol is ΔH of the reaction
Explanation:
The reaction is:
1/2 Ba(OH)₂ + HCl → 1/2 BaCl₂ + H₂O + ΔH.
Where ΔH is the heat of reaction per mole of water.
Moles of water produced are equal to moles of HCl that are:
70.0mL = 0.070L * (0.640mol / L) = 0.0448moles HCl = Moles of water produced.
Now, heat produced is determined using coffee-cup calorimeter equation:
Q = m×ΔT×C
Where Q is heat released
m is mass of solution (70mL + 70mL = 140mL = 140g -Density of 1g/mL-)
ΔT is change in temperature (27.36°C - 23.00°C = 4.36°C)
And C is specific heat of the solution (4.184J/gK)
Replacing:
Q = 140g×4.36°C×4.184J/gK
Q = 2553.9J
This is the heat released when 0.0448 moles of water are produced, that means ΔH is:
2553.9J / 0.0448moles
ΔH = 57000J/mol =
57.0kJ/mol is ΔH of the reaction
What is the difference between the interaction of matter in a compound and the interaction of matter in a mixture?
Answer:
Matter in compound having chemical bonds while in mixture matter have physical interaction.
Explanation:
We know that element is a substance that is made up of atoms. The atoms of different elements combine to form compound. These are the form of matter that have characteristic properties and having fixed chemical composition. The atoms of different elements are combine to gather through the chemical bond.
For example:
Consider the compound water. It has hydrogen and oxygen. Atoms are bonded together through chemical bond and having fixed proportion. So we can say that their interaction is chemical interaction.
While in mixture different matter combined through the physical interaction.
Atoms of different elements are not chemically bonded together.
For example:
Mixture of sand and water.
Mixture of oil and water.
An isotope has 21 neutrons and a mass number of 40, it has 19 electrons and protons and 21 neutrons. true or false plz explain the answer
Answer:
True
Explanation:
Given parameters:
Number of neutrons = 21
Mass number = 40
Unknown:
Number of electrons = 19
Number of neutrons = 21
Solution:
To find verify whether it is true or false, we must understand the relationship between the given species.
Protons are the positively charged particles
Neutrons do not carry any charge
electrons are the negatively charged particles
Mass number = number of protons + neutrons
Number of protons = 40 - 21 = 19
In an atom, the number of protons and electrons are the same for charge stability.
Number of electrons = 19
This diagram shows one plate sliding beneath another. what landform is most likely to form at this boundary?
A) Rift Valley
B) Volcanic Islands
C) Fault Line
D) Trench
Answer:
D) Trench
Explanation:
At this boundary, the landform that is most likely to form is trench.
A trench is one of the notable subduction features that occurs as a prominent depression on the earth surface where one plate slides under another.
A trench is very deep and also very narrow. It is a highly conspicuous and prominent feature on the ocean floor. At a subduction zone, the denser oceanic plate slides under that lighter continental plate. Some of the deepest part of the earth can be found along deep ocean trenches. An example is the Mariana trench.Fluorine 19 has an atomic number of 9 and a mass number of 19 How many neutrons does an atom of fluorine 19 contain ?
Answer:
10
Explanation:
Atomic mass subtracted by the atomic number to get your answer
Explain Newton's first law of motion. Write your answer in the essay box below.
Answer:
Gravity
Explanation:
Answer:
that something that’s in rest will stay that way until a force moves it. And that a moving object will keep moving until a force stops it.
Explanation:
2. Which statement is true about all metals?
A. They have one valence electron.
B. They have freely moving electrons.
C. They have more electrons than protons.
D. They always gain electrons.
Answer:
they have freely moving electrons
Answer:
Explanation:
a) 1/2 true: The Alkali metal group has one valence electron but Earth metals have two valence electrons.
b;) true Metals are good conductors because they have many free electrons.
c:)a negative ion has more electrons than protons
d;) metals lose electrons and non-metals gain electrons. metals transfer electrons to nonmetals.
I think B is your best answer.
What is the formula for diphosphorus pentoxide
NEED HELP PLEASE ANSWER Which of the following statements is true?
Rocks usually absorb heat evenly.
Water expands when it freezes.
Caves are formed through oxidation.
The movement of sediment is called weathering.
Answer:
water expands when it freezes
Explanation:
Answer:
B. Water expands when it freezes.
Explanation:
What happens to energy when water changes states of matter from solid to gas?
Answer:
Sublimation is the process from a solid directly into a gas. The particles of a solid absorb enough energy to completely overcome the force of attraction between them. Solid carbon dioxide changes directly to the gaseous state. Therefore the state from soiid and gas can be observed.
Explanation:
Hope this helps! <3
Which structure captures and stores the sun's energy in plant cells?
Choose the correct answer.
O chloroplast
O mitochondria
O Golgi apparatus
endoplasmic reticulum
Pls hurry
Answer:
chloroplast
Explanation:
mixing chocolate syrup into milk
picking up a paper clip with a magnet
Mass or state
Were new substances created from old substances during electrolysis? Explain.
What is used to determine the number of each atom in an ionic formula?
Answer:
The Oxidation State of each atom
Explanation:
What is the correct electronic configuration for I?
Answer: [Kr] 4d10 5s2 5p5
Comparing Protists and Prokaryotes
Which statement correctly compares protists to prokaryotes?
The cells of protists and prokaryotes contain nuclei.
The cells of protists have cell walls, but prokaryotes do not.
Both protists and prokaryotes are multicellular.
Most protists and all prokaryotes are unicellular.
.Answer: Physically, the cell structure of protists and prokaryotes differ. First, the external structures of prokaryotes consist of cell walls made of peptodoglycan. Protists do not have a cell wall, and instead have a semi-permeable plasma membrane in the form of a phospholipid bilayer
Explanation: 1 - Most of the and all Prokaryotes are unicellular organisms. 2- Prokaryotes lack a proper nucleus and other membrane-bounded organelles while have membrane-bounded nuclei and other organelles.
Answer:
its D
Explanation:
I took the assignment on edg
Part B: Short Answer - Answer the following questions
6. Why are the elements so important?
7. The transition metal Cobalt has an atomic number of 27 and an atomic mass of approximately 59
AMU. How many neutrons does it have? Show all your calculations for full marks.
I
28
tv
I need help fast 50 points
Answer:
7. 32neutrons
Explanation:
mass number is equal to number of protons plus the number of neutrons
the atomic number is also known as the number of protons
therefore 59-27=32
How would you describe the mood in the section nose to the ground?
Answer:
The mood of the section “Nose to the Ground” could be described as suspenseful.
Explanation:
please help!! im taking the test now
Which lists the elements in order from least conductive to most conductive?
A. nitrogen (N), antimony (Sb), bismuth (Bi)
B. nitrogen (N), bismuth (Bi), antimony (Sb)
C. antimony (Sb), nitrogen (N), bismuth (Bi)
D. bismuth (Bi), antimony (Sb), nitrogen (N)
Answer:
b
Explanation:
Answer: nitrogen (N), antimony (Sb), bismuth (BI)
Explanation:
The elements listed belongs to Group V on the periodic table.
compared to nonmetals, metals tend to have-
A. higher ionization energy
B. an acidic form of oxide
C. lower electronegativity
D. higher electron shielding
Answer:
C. Lower Electronegativity
Periodic table is divided into metals, non metals, semiconductors and noble gases on the basis of electron gain or loss. Metals have lower electronegativity. The correct options is option C.
What is metal?Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.
Lets take properties
1.Since metals have free electrons that's why they can conduct electricity.
2. Since atoms in metals are very closely packed in a definite crystal so these are solid. Metals are not brittle that is, it can not be broken down easily
3.Metals do not react with water easily.
4.Metals are denser than water hence sink in water.
5. Metals are meant to give electrons so these have low ionization energy. and lower electronegativity.
6. Metals form basic form of oxide.
7. Metals have lower electron shielding.
Therefore the correct options is option C.
Learn more about the metals, here:
https://brainly.com/question/27859211
#SPJ2
Changing a chemical property of a substance
never alters its chemical composition.
always alters its chemical composition.
will only alter its chemical composition if the change is small.
will only alter its chemical composition if the change is large.
Answer:
A chemical change in a substances always alters the chemical composition.
Explanation:
Molecules always are combined to create a new substance, otherwise it would only be a physical change and the substance would have still had the same molecular design.
How many atoms are in 3.5 moles of carbon?
Answer:
Explanation: There are 5.418⋅1024 atoms in 3 moles of Carbon Dioxide. Explanation: 1 Mole is 6.02⋅1023 molecules. Therefore 3 Moles of Carbon ...
As in 1 mole there are 6.022 * 10^23 atoms.
So in 3.5 mole of carbon there are 21.077 * 10^23 atoms.
What do we should know about mole concept?
The mole concept is a convenient way to describe a substance's volume. The numerical magnitude and the units in which it is expressed are the two components of any measurement. When a ball's mass is measured to be 2 kilograms, for instance, the magnitude is "2" and the unit is "kilogram."Even one gram of a pure element contains a significant number of atoms when dealing with particles at the atomic (or molecular) level. The mole concept is frequently used in this context. It focuses primarily on the "mole" measurement, which represents a count of a very large number of particles.A mole is the amount of a substance that contains precisely 6.02214076 * 10^23 "elementary entities" of the given substance, as defined in the field of chemistry.Every substance has the same number of atoms or other particles in a mole. The mole and an element's mass are related in the following ways. There are 6.02214076 * 10^23 carbon-12 atoms in one mole, giving it a mass of 12 grams. By definition, one mole of oxygen has the same number of atoms as one mole of carbon-12, but it weighs 15.999 grams. As a result, oxygen has more mass than carbon. Weights of molecules or formulas can be accounted for using this logic as well.
To know more about mole check this:
brainly.com/question/21317316
#SPJ2
In the reaction CaI2 (s) + Cl2 (g) → CaCl2 (s) + I2 (s), what phases are the products in after the reaction? Question 1 options: A) CaI2 is a solid, and CaCl2 is in aqueous solution. B) CaCl2 is a liquid, and I2 is a gas. C) Both products are liquids. D) Both products are solids.
Answer:
D) Both products are solids.
Explanation:
In a chemical reaction such as:
CaI2 (s) + Cl2 (g) → CaCl2 (s) + I2 (s)
You can see the phases of the chemicals involved in the reaction inmediately after the chemical formula. Where (s) means solid, (l) liquid and (g) gas
The CaI₂, CaCl₂ and I₂ are solids and Cl₂ a gas.
That means the products are solids and right solution is:
D) Both products are solids.In what two ways the organisms in the table similar to organisms in the plat kingdom
Answer:
They both are multicellular and Eukaryotes.
A zebra grazing in the savannah sees a nearby lion charging to attack and eat the zebra Which of the following is the most likely response of the zebra? Ignore the charging lion O Attack the lion O Run away from the lion O Stand tall and intimidate the lion
Answer:
Run away from the lion
Explanation:
A lion is a top predator of the Savannah forest, meaning that it feeds on a wide range of prey. According to this question, a zebra grazing in the savannah sees a nearby lion charging to attack and eat the zebra. The first instinct of the Zebra is to RUN AWAY FROM THE LION.
The zebra runs because it does not want to get eaten by the fierce predator, owing to the fact that it does not have the physical strength to withstand the lion in a physical combat.
1) Determine the grams of phosphate in 0.430 g potassium dihydrogen phosphate and show that the resulting solution when 0.430 g potassium dihydrogen phosphate is dissolved in 100 ml (100 g) water is 3000 ppm (3000 mg/L) in PO43–.
Answer:
3000ppm of PO₄³⁻
Explanation:
First, we need to calculate the moles of potassium dihydrogen phosphate, KH₂PO₄. These moles are equal to moles of phosphate, PO₄³⁻:
Moles KH₂PO₄ -Molar mass: 136.086g/mol-:
0.430g KH₂PO₄ * (1mol / 136.086g) = 3.16x10⁻³moles KH₂PO₄ = Moles PO₄³⁻.
Now, mass of PO₄³⁻ is:
Mass PO₄³⁻ -molar mass: 94.97g/mol:
3.16x10⁻³moles PO₄³⁻ * (94.97g / 1mol) = 0.300g of PO₄³⁻ = 300mg
In 100mL = 0.100L
300mg PO₄³⁻ / 0.100L =
3000ppm of PO₄³⁻0.430 g of KH₂PO₄ contain 0.300 g of PO₄³⁻. When dissolved in 100 mL of water, the resulting solution is 3000 ppm in PO₄³⁻.
We want to calculate the mass of PO₄³⁻ in 0.430 g of KH₂PO₄.
We know that:
The molar mass of PO₄³⁻ is 94.97 g/mol.The molar mass of KH₂PO₄ is 136.08 g/mol.The mass ratio of PO₄³⁻ to KH₂PO₄ is 94.97:136.08.0.430 g KH₂PO₄ × (94.97 g PO₄³⁻/136.08 g KH₂PO₄) = 0.300 g PO₄³⁻
When 0.300 g (300. mg) of PO₄³⁻ are dissolved in 100 mL of water, the resulting concentration, in ppm, is:
300. mg/0.100 L = 3000 ppm
0.430 g of KH₂PO₄ contain 0.300 g of PO₄³⁻. When dissolved in 100 mL of water, the resulting solution is 3000 ppm in PO₄³⁻.
Learn more about ppm here: https://brainly.com/question/13395702
If carbon dioxide, methane, and water vapor were not in the atmosphere, then
Answer: they would have to be some where else
Explanation: hope this helps a little
1. The temperature of a sample of nitrogen
gas is a measure of the molecules' average
(1) activation energy
(2) potential energy
(3) kinetic energy
(4) ionization energy
1
Answer:
(3) kinetic energy
Explanation:
The temperature of a sample of nitrogen gas is a measure of the molecules' average kinetic energy. This is one of the postulate of the kinetic theory of gases.
A gas is composed of a large number of identical molecules moving at different speeds. The space occupied by the gas molecules themselves are negligible compared to the volume of the space they occupy. The molecules are independent of one anotherThe molecules collide with one another and with the walls of the container. The temperature of the gas is a measure of the average kinetic energy of the molecules.The temperature of a sample is a measure of the molecules' average
kinetic energy.
Increase in the temperature of a sample increases the degree of
randomliness and elastic collision of its atoms. We can define kinetic
energy as the type of energy as a result of its motion. Gas have more
kinetic energy as a result of it having the highest temperature while solids
have the lowest.
This explains why temperature is the measure of the average kinetic
energy of an object.
Read more on https://brainly.com/question/18698029
which city is most likely experiencing sunny weather due to e high pressure system A- raleigh , B- new york ,C - little rock, D- santa fe
Answer:
a
Explanation:
What is the relationship between the volume of water and the dripping time?
A. As time increases, the volume of water increases. B. As time increases, the volume of water remains steady.
C. As volume increases, the dripping time decreases.
D. As volume increases, the dripping time remains steady.
Answer:
A
Explanation:
The more time given for the water to drip, the more droplets fall, which increase the volume of the water
Hope this helps! Good luck :)
Arrange the electrons in the sulfur atom in the orbital diagram. Use the periodic table to determine the number of electrons for sulfur. Drag each image to the correct location on the diagram. Each image can be used more than once.
Answer: 1s= 11
2s=11 2p= 11,11,11
3s=11 3p=11,1,1
Explanation:
The statement, that describes the electrons in the sulfur atom in the orbital diagram is "[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}[/tex]"
What is electrons?Electron can be referred as subatomic particle containing negative charge on it.
What is an orbital diagram?Orbital diagrams are graphical representations of electrons in an atom. Three rules can be used to create orbital diagrams. Each electron, according to the Aufbau Principle, occupies the lowest energy orbital. According to the Pauli Exclusion Principle, only two electrons can fit into a single orbital.
According to Hund's' rule, electrons enter distinct orbitals within the same sub-level before doubling up inside orbitals. A Sulphur atom is a neutral atom with the atomic number of 16, implying that it possesses a total of 16 electrons. According to the Aufbau rule, electrons will be put into the 1s orbital first, then the 2s, then the 2p, and so on. Because the s subshell can only accommodate two electrons, the first two electrons in the Sulfur electron configuration will go in the 1s orbital.The next two electrons will enter the 2s orbital, followed by the following six electrons, which will enter the 2p orbital because the p subshell can store up to six electrons. The following two electrons will enter the 3s orbital, and the final four electrons will enter the 3p orbital. As an outcome, the Sulphur electron configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}[/tex]
Hence the correct answer is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}[/tex].
Learn more about orbital diagram and electron here
https://brainly.com/question/14487703
#SPJ2