How many kilojoules are absorbed when 280 g of pcl5 reacts? pcl5(g)→pcl3(g)+cl2(g)δh=+67kj?
The molar mass of PCl5 is 208.24 g/mol. So calculating for the number of moles:
moles PCl5 = 280 / 208.24
moles PCl5 = 1.34 mol
From the equation, 67 kJ of heat is absorbed for every 1 mole hence:
total heat = 67 kJ / mol * 1.34 mol
total heat = 90 kJ
Which state of matter takes both the shape and volume of its container?
a. solid
c. gas
b. liquid
d. both b and c ____ 11. which state of matter is characterized by having an indefinite shape, but a definite volume?
a. gas
c. solid
b. liquid
d. none of the above?
Answer:
For 10: The correct answer is Option c.
For 11: The correct answer is Option b.
Explanation:
There are 3 states of matter:
Solid state: In this state, the particles are closely packed and does not have any space between them. Thus, this state of matter has the highest intermolecular forces of attraction.
This state have a definite shape and volume.
Liquid state: In this state, the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. The intermolecular forces between the particles are less as compared to the solid state.
This state have a definite volume but does not have a fixed shape as they can take up the shape of container in which they are kept.
Gaseous state: In this state, the particles are loosely arranged and have a lot of space between them. Thus, this state of matter has the lowest intermolecular forces of attraction.
This state have indefinite volume as well as shape. It can take up the volume and shape of the container in which they are kept.
From the above information:
For 10: The state of matter which takes up the shape and volume of the container is gaseous state.
Hence, the correct answer is Option c.
For 11: The state of matter which has indefinite shape but have a definite volume is liquid state.
Hence, the correct answer is Option b
A gas takes both the shape and volume of its container, while a liquid has a definite volume but takes the shape of its container. A solid does not conform to the container's shape or volume.
States of matter are characterized by their ability to take the shape and volume of their containers. The state of matter that takes both the shape and volume of its container is the gas state. This is because the particles in a gas are spread out and can move freely to fill any space available. On the other hand, a liquid has a definite volume but takes the shape of its container. Conversely, a solid does not change to fit the shape or volume of its container as its particles are tightly packed and only vibrate in place.
Which state of matter takes both the shape and volume of its container?
The answer is gas (c), as gases will expand to fill the entire volume of their container and take its shape.
Which state of matter is characterized by having an indefinite shape but a definite volume?
The answer is liquid (b). Liquids have a fixed volume but will flow and change their shape to conform to the shape of their container, without changing volume.
Why did Rutherford conclude that the atom was mostly empty space?
Rutherford deduced that an atom is mostly empty space because most alpha particles in his experiment passed through the gold foil unabated; only a few particles deflected due to the presence of a small, dense, positively charged nucleus.
Rutherford concluded that the atom was mostly empty space based on his gold foil experiment. He observed that the vast majority of the alpha particles passed through the gold foil without deflection, indicating that they encountered no significant obstacle, hence most of the atom was empty space. A very small number of alpha particles were deflected at large angles, and even fewer were deflected straight back, which suggested that they interacted with something very small and with a substantial positive charge and mass. This led Rutherford to propose the nucleus, a tiny, dense center within the atom composed of protons and neutrons. He surmised that the electrons orbit this nucleus, much like planets around the sun, in what is known as the planetary model of the atom.
The element chlorine is represented by the symbol ____. (Capitalization is important.)
HELP ASAP!! THIS IS DUE TOMORROW!! I WILL MARK YOU AS A BRAINLIEST IF ANSWERED NOW!!
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Giraffes with short necks lived in arid regions. Over time, grasses disappeared, forcing giraffes to eat from trees. Mutations in the genome led to some giraffes inheriting the trait for long necks. Over time, there were more giraffes with long necks in the region. What are the two reasons for the change in the population of giraffes? (More than one answer)
- adaptation?
- artificial selection?
- natural selection?
- harmful genetic traits?
Answer: adaptation
natural selection
Natural selection refers to the differential survival of the organisms in the population. It describe the fact that individual that have favorable phenotypic characteristics have better chances of survival over others in the changing environment. Adaptation is a genetic change or mutation that helps organism to survive in it's ecological niche. Due to the helpful nature of these genetic changes they are passed down from one generation to the next generation and favors the survival and abundance of a species.
Adaptation and natural selection has resulted in the change in the population of the giraffes. The giraffes being in short neck adapted the increase in neck length with an effort to obtain leaves from tall tries. The long neck giraffe got the better chances of survival and reproduction, due to natural selection the trait was passed on to generation. This resulted in the evolution of long neck giraffe species.
Write down an example of any chemical reaction. identify reactants, products, direction of the reaction and explain equilibrium.
What change takes place when a liquid absorbs heat energy without increasing its temperature?
the pressure increases
What do the elements sulfur (s), nitrogen (n), phosphorus (p), and bromine (br) have in common? refer to the periodic table for help?
Answer:
They have the same number of valence electrons.
"What is salt composed of?" Maria wondered. She took a microscope from the cabinet in her science classroom, put some salt on a microscope slide, and focused on the salt. She saw tiny squares on the slide. "I guess salt is made only of crystals:" Maria observed. Is Maria correct in her conclusion?
Answer is: No. Salt, like all matter is composed of atoms.
For example, table salt is sodium chloride mixed with small amount of potassium iodide (KI), sodium iodide (NaI) or sodium iodate (NaIO₃).
Atomic level - sodium chloride (NaCl) has crystal cubic structure (lattice-type arrangement) with ionic bonds. Sodium is cation with charge 1+ and chlorine is an anion with charge 1-.
Macroscopic level - table salt is colorless crystal, soluble in water with high melting and boiling temperature.
Each element has its own emission bright line spectrum pattern. True or false?
the answer is true. Each element has it's own emission bright line spectrum pattern
PLEASE HELP!!!The measurement of how fast an object moves over a certain amount of time.
Question 1 options:
Speed
Acceleration
Displacement
Velocity
Which of the following depends on an object's displacement not distance from the starting point?
Question 2 options:
Acceleration
Displacement
Speed
Velocity
What is the average speed of an object that travels 50 miles in 2 hours?
Question 3 options:
25 mph
50 mph
100 mph
2 mph
Which of the following is an example of velocity?
Question 4 options:
100 mph
25 east
50 mph east
100 miles east
Which of the following is defined as displacement over change in time?
Question 5 options:
Velocity
Acceleration
Speed
Displacement
What is the velocity of an car that travels 50 miles north, turns around and travels 50 miles south, in 5 hours?
Question 6 options:
25 mph north
2 mph south
0
5 mph south
I dont need number 7
Macon is 50 miles from Atlanta. If the time of the trip increases, what happens to the speed?
Question 8 options:
It decreases
It increases
It stays the same because the distance stays the same
It averages out to the same speed.
1. Speed, since we know that [tex]s=\frac{d}{t}[/tex], where s is speed, d is distance and t is time
2. Velocity, for velocity you need to consider the direction and displacement gives the direction of travel.
3. 25 mph, because [tex]s=\frac{d}{t} =\frac{50}{2} =25mph[/tex]
4. 50 mph east, velocity unlike speed has direction.
5.Velocity, displacement gives the formula [tex] v=\frac{d}{t}[/tex] direction.
6. 0, the displacement is zero so velocity is zero
7. It decreases, speed is inversely proportional to time
is MgBr2 a covalent bond or an ionic bond
In the given question, [tex]\rm MgBr_2[/tex] is an ionic bond. The correct answer is option 2.
A covalent bond is a type of chemical bond in which two atoms share one or more pairs of electrons.
Ionic bonds is formed between a metal and a nonmetal, where one atom gives up an electron to another atom. In [tex]\rm MgBr_2[/tex], magnesium (Mg) is a metal and bromine (Br) is a nonmetal. Magnesium gives up two electrons to bromine, forming an ionic bond.
Therefore, option 2. ionic bond is the correct answer.
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How do the electrons in bonds (bonding domains) differ from lone pairs (non-bonding domains)?
The electrons in bonds (bonding domains) differ from lone pairs (non-bonding domains) is because the bonding domains are bonded to the central atom vs the lone pairs are just stuck on as extra electrons. The difference of bonding domains from non-bonding domains is that the bonding domains are bonded to the central atom and the non-bonding domains are just stuck on as extra electrons.
Answer:
The bonding electrons are different from nonbonding electrons by the arrangement with the central atom. Bonding electrons are bonded with the central atom. Nonbonding electrons appear are electron clouds.
Explanation:
During the formation of a chemical bond, there are bonding electrons and loan pairs.
The electrons of both the atom in a chemical bond share with each other and form a stable sigma bond. The electrons are linearly bonded with each other.
The electrons which are not directly bonded with other atoms, occupy the space at the top and bottom of the sigma bond. These electrons are present as the electron cloud and are termed the non-bonding electrons.
The bonding electrons differ from non-bonding electrons as bonding electrons are bounded by the central atom. Loan pair of electrons or nonbonding electrons are present as the electron cloud above or below the bond.
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Which shows the temperatures of three substances, in order, from greatest to least?water vapor, ice, waterice, water, water vaporwater, water vapor, icewater vapor, water, ice?
The temperatures of three substances in order from greatest to least is
Water vaporWaterIceWhat is Temperature?This is the degree of hotness or coldness of a substance. It is also the
average kinetic energy present in a body.
Higher temperatures usually have the highest average kinetic energy.
Gases have the highest kinetic energy while Solids have the least kinetic
energy. In the case of Water, the gaseous form is Water vapor and the
solid form is Ice.
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Consider n2 (g) + 3h2 (g) →→ 2nh3 (g). what is the mass of nitrogen gas required to react with 0.129 g h2?
Answer:pookie dookie
Explanation:
Consider a neutrally charged atom that has an atomic mass number of 80, which includes 35 neutrons. how many electrons does this atom have?
Answer:
45 electrons.
Explanation:
mass number = 80
no. of neutrons = 35
Given that it is a neutrally charged atom,
no. of electrons = mass no. - no. of neutrons
= 80 - 35
= 45 electrons.
Ionic compounds can conduct electricity when dissolved in water or melted, because A. they have shared electrons. B. they have no ions to contribute to the solution. C. the ions are fixed in place. D. the ions are free to move.
Which of the following statements correctly describe metalloids?
- Metalloids are elements that have both metal and nonmetal properties
- Metalloids are metals that do not lose
-Metalloids are metals that do not attract electrons
-Metalloids are elements that only have metal properties Save
The statements that describe metalloids are these are elements that have both metal and nonmetal properties. The correct option is A.
What are metalloids?Metalloids are chemical elements that have the properties of both metals and non-metals. Metalloids are brittle and good conductors of electricity. They form alloys with metals. They have various chemical and physical properties that are used in many things like catalysis, flame, or glasses.
So, metalloids are elements that contain both metals and non-metals. They are not the metals that don't lose. They always do not attract electrons and only metal properties are also wrong because it has the properties of both.
Thus, the correct option is A. Metalloids are elements that have both metal and nonmetal properties.
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∠3 and ∠4 are _______.
supplementary angles
complementary angles
vertical angles
congruent
Answer : The [tex]\angle 3\text{ and }\angle 4[/tex] are, supplementary angles.
Explanation :
Supplementary angles : The two angles are supplementary angle in whcih the the sum of those two angle are [tex]180^o[/tex]
Complementary angles : The two angles are complementary angle in whcih the the sum of those two angle are [tex]90^o[/tex]
Vertical angles : Vertical angles are the angles that are opposite to each other when two lines intersect each other.
Congruent angle : It is defined as they have the same angles.
From the above information we conclude that,
[tex]\angle 1\text{ and }\angle 2[/tex], [tex]\angle 2\text{ and }\angle 3[/tex], [tex]\angle 3\text{ and }\angle 4[/tex] and [tex]\angle 4\text{ and }\angle 1[/tex] are the supplementary angles.
[tex]\angle 1\text{ and }\angle 3[/tex] and [tex]\angle 2\text{ and }\angle 4[/tex] are the vertical angles.
Hence, the [tex]\angle 3\text{ and }\angle 4[/tex] are, supplementary angles.
Suppose an aqueous mixture is prepared containing magnesium sulfate (mgso4), copper(ii) sulfate (cuso4), metallic magnesium, and metallic copper. what reaction, if any, will occur?
Which substance can be decomposed by a chemical change?
1. Sodium
2.argon
3.sulfur
4.amonia
Among the given substances, Ammonia, a compound, can be decomposed into Nitrogen and Hydrogen by a chemical change.
Explanation:The substance that can be decomposed by a chemical change among Sodium, Argon, Sulfur, and Ammonia is Ammonia. In a chemical change, one or more substances are converted into different substances. In this context, Sodium, Argon, and Sulfur are elements that exist in their most simplified form and cannot be broken further down by chemical change. On the other hand, Ammonia (NH3) is a compound and can be decomposed into Nitrogen and Hydrogen via chemical changes.
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HELP ASAP PLEASE!!!! 15 PTS!!
Identify the information that can be included in a chemical equation. Check all of the boxes that apply.
how long the reaction takes to occur
the states of the reactants and products
the temperature and pressure at which the reaction was carried out
the relative amounts of reactants and products
the actual mass of product that is produced by the reaction
the type of catalyst that is used to speed up the reaction
whether the reaction can go in both directions
the correct answer is 2,3,4,6, and 7
Answer:
the states of the reactants and products
the temperature and pressure at which the reaction was carried out
the relative amounts of reactants and products
the type of catalyst that is used to speed up the reaction
whether the reaction can go in both directions
2, 3, 4, 6, 7 / B, C, D, F, G
Which two categories of organic compounds store energy? which of these organic compounds is more common?
How many moles of lithium phosphate are in 77.6 g of this substance?
Which of the following planets has a shorter year than Earth, as measured in Earth days? A. Uranus B. Mercury C. Saturn D. Jupiter
Mercury is the answer
Which has more mass, a 28.0-cm3 piece of lead or a 16.0-cm3 piece of gold? the density of lead is 11.4 g/cm3; the density of gold is 19.3 g/cm3?
The lead piece has more mass with a mass of 319.2 g, while the gold piece has a mass of 308.8 g.
To determine which piece has more mass, we need to calculate the mass of each piece using the given densities.
The mass of an object can be calculated using the formula:
mass = density x volume
For the lead piece:
mass of lead = density of lead x volume of lead
mass of lead = 11.4 g/cm3 x 28.0 cm3
mass of lead = 319.2 g
For the gold piece:
mass of gold = density of gold x volume of gold
mass of gold = 19.3 g/cm3 x 16.0 cm3
mass of gold = 308.8 g
Comparing the masses of the two pieces, we can see that the lead piece has more mass with a mass of 319.2 g, while the gold piece has a mass of 308.8 g.
N writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
Answer:
H2
Explanation:
The 2 in this equation is supposed to be little.
Which of the following would form a cation? Ne Li O I
Among the following, Li will form Catian due to its high probability of donating electron as it have low ionization enthalpy.
What is Ionization Enthalpy ?The ionization enthalpy of an element can be defined as the amount of energy required to remove an electron from an isolated gaseous atom in its gaseous state.
Among th given options ;
Ne is an inert gas element i.e, inactive element and has complete outermost orbit thus no need to accept or donate electron.
Li will form Catian due to its high probability of donating electron as it have low ionization enthalpy.
O has stable outermost orbital and thus no need to accept or donate electron.
I is the least reactive element and comparatively high ionization enthalpy.
Hence, Among the following, Li will form Catian due to its high probability of donating electron as it have low ionization enthalpy.
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The metric system is only used in France
True
or
False