The exception to the rule concerning the solubility of chlorides in water is PbCl2.
The solubility rules give us an idea of which substances are soluble in water and what substances are not soluble in water. According to the solubility rules, chlorides are soluble in water.
However, chlorides of lead are not soluble in water hence, the exception to the rule is PbCl2.
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From the options given, the chloride salt that is not soluble is PbCl₂.
Solubility simply means the ability of liquid, solid, or gaseous chemical substance to be bake to dissolve in solvent and then form a solution.
It should be noted that most chloride salts are soluble. Examples include NH₄Cl, AlCl₃, ZnCl₂, CuCl₂, etc. However, the chloride of lead aren't soluble in water. Therefore, PbCl₂ isn't soluble in water.
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Balancing Chemical Equations
Based on the chemical equation, use the drop down menu to choose the coefficients that will balance the chemical
equation
(vbo,- (v]),
Will make Brainlyest plzzzz help!!!
Answer:
3O2→ 2O3
Explanation:
by multiplying 2 by 3 we get 6 on both sides
One mole of what substance contains a total of 6.02x10^23
Answer:
oxygen
Explanation:
One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.
The diagram shows the box for an element in the periodic table. Whats is the atomic mass of the element shown?
Explanation:
option C is correct!
hope this answer helps you dear!
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The Correct choice is ~ C
Atomic mass of Sulfur (S) is 32.1 u
a) Explain the changes in the following properties when going across Period 3 from
sodium (Na) to argon (Ar).
i. The element's reactivity towards oxygen
ii. The electrical conductivity of the oxides
Answer:
The ironization energies increase as you go across the period So the electrical conductivity of the oxides is your answer
A burning candle demonstrates the following type of energy transformations.
A: chemical → heat → light
B: heat → chemical → light
C: electrical → light
D: chemical → electrical → light
Answer:
B
Explanation:
the candle is hot so the first energy form should be heat. u could now just eliminate the rest but for further notice. the heat melts the wax in the candle, which is a physical change but also the thread is burning out which is a chemical change then light follows
Imagine that scientists have just discovered a non-bird dinosaur skeleton. They want to know whether the dinosaur was closely related to birds. What features in ...
might help them decide?
Answer:
This evidence includes fossilized bones, teeth, eggs, footprints, teeth marks, and even dung. When paleontologists compare a skeleton of a living bird to the fossilized skeleton of a non-bird theropod, like Sinornithosaurus, they see many similarities.
Explanation:
Answer:
When people think of dinosaurs, two types generally come to mind. There were the huge herbivores,
like Apatosaurus, with their small heads and long tails. There were also those fearsome carnivores,
like Tyrannosaurus rex, that walked on two legs and had a mouthful of teeth like kitchen knives.
Living Dinosaurs
These large dinosaurs are no longer around, but dinosaurs still live among us today. They are the
birds. It's difficult to imagine that a bird on your window sill and a T. rex have anything in common.
One weighs less than a pound. The other was the size of a school bus, tipping the scales at eight
tons. But for all their differences, the two are more similar than you might think. In fact, birds and T.
rex are close relatives. They all belong to a group of dinosaurs called theropods.
This is a cladogram, a "" showing the relationships among organisms. The group called dinosaurs includes the extinct dinosaurs
and all their living descendants. All its members, including living birds, descended from the very first dinosaur-their common ancestor.
That's why birds are a kind of dinosaur (just as humans are a kind of primate).
Skeletal Evidence
When paleontologists compare a skeleton of a living bird to the
fossilized skeleton of a non-bird theropod, like Sinornithosaurus,
they see many similarities. They both have a hole in the hipbone, a
feature that distinguishes most dinosaurs from all other animals.
This feature allows an animal to stand erect, with its legs directly
beneath its body. All theropod dinosaurs, including birds, have a
furcula, also known as a wishbone. Another shared characteristic is the presence of hollow bones.
Hollow bones reduce the weight carried by an animal. This feature enables the animal to run faster. It
probably also played a role in the evolution of flight.
thought to have evolved for flight. The discovery of more and more non-flying dinosaurs with feathers
disproved that explanation. For these dinosaurs, feathers may have served other functions, like
gliding, insulation, protection, and display. Feathers play that same role in many bird species today.
Based on the evidence of shared characteristics, scientists have concluded that birds are a type of
Birds are the only dinosaurs with the ability to fly. This is
very interesting to scientists who want to know when the
capability of flight emerged. To find out, some scientists
study the brains of bird and non-bird dinosaurs. Soft
tissue, such as brains, is almost never preserved in the
fossil record. What is preserved is the imprint the brain
left on the inside of the skull. Now scientists are using
computed tomography (CT) scanners to create
endocasts. These are detailed, three-dimensional
reconstructions of the interiors of fossilized skulls.
In a recent study, researchers were able to peer inside
the braincases of more than two dozen specimens.
"Technology allows us to look inside these specimens
without destroying them," says Dr. Amy Balanoff, a
Museum research associate. "It's a non-destructive way
to basically slice up a dinosaur brain. We look inside and see what it can tell us about the evolution of
the brain within dinosaurs. Most of us grew up thinking that dinosaurs had tiny brains, but actually
some had really big brains."
The endocasts allow Balanoff and other researchers to
explore the outer shape of the brain in more detail. In
addition, the casts also provide new information about
the volume and shape of different regions of the brain.
For example, scientists looked at a detailed view of the
dinosaur cerebrum, a region of the brain related to
cognition and coordination. They found that this region
was very large in non-bird dinosaurs closely related to
birds. Dr. Balanoff's research suggests that these
dinosaurs developed big brains long before flight and that
these bigger brains prepared the way for them to fly.
When examining skeletal, behavioral, and brain
evidence, scientists see that birds and non-bird dinosaurs
share many features. This helped them conclude that
dinosaurs aren't extinct after all. They're living among us today.
(Im a really fast Typer and Thinker)
Have a nice day
Which of the following has the greatest number of groups or branches?
A hexane
B. 3-ethylhexane
C. 2,3-dimethylpentane
D. 2-methylheptane
*correct answers only*
Answer:
C
Explanation:
Option C should be the correct one, since you have two methyl groups in the alkane (parent) chain.
OIIIIIIIIIIIIIIII BAAAAKKKKAA
Answer:
what is meaning of this.
Answer:
On April 30, 1789, George Washington, standing on the balcony of Federal Hall on Wall Street in New York, took his oath of office as the first President of the United States.
Which group is composed entirely of nonmetals?
Answer:
These are the nonmetals.
Hey! Please help. Will mark brainlist if u are right, ty
Answer:
40 hopefully right
Explanation:
A sample of hydrogen sulfide, H2S, has a mass of 13.7513.75 g. Calculate the number of hydrogen sulfide molecules in the sample
Answer: 2.43 x 10^23 molecules
Explanation:
Molar mass of H2S: 2(1.008) + 32.06 = 34.1 g/mole
Avogadro’s number for converting moles to atoms or molecules: 6.02 x 10^23
(13.751375g H2S)(1 mole H2S)(6.02x10^23 molecules) / (34.1g/mole H2S)(1mole H2S) = 2.43 x 10^23 molecules H2S
What does percent composition tell you about a molecule?
O A. It tells you how the elements are arranged in the molecule.
B. It tells you the ratio of elements in the molecular formula.
C. It gives you the total number of atoms in the molecule.
D. It tells you how much of a molecule is made up of each element.
SUBMIT
Answer:
B
Explanation:
percentage composition helps to determine the percentage of each element in a compound
Usain Bolt went from 0.0 to
11.0m/s in 3.4s. What was his
acceleration?
Answer:
Answer: Change in speed = 11 m/sTime taken = 3.4sHence, acceleration = (11/3.4) m/s² = 3.235 m/s²
Explanation:
(winks and runs off)
Acceleration is 3.235 m/s² when Usain Bolt went from 0.0 to 11.0 m/s in 3.4 seconds.
What is acceleration?
Acceleration is defined as a rate at which the velocity changes with time with respect to both speed and direction.An object is said to be accelerated if it's speeds up r slows down.
Motion along a circle is always accelerated even when speed is constant it's direction is continuously changing.Acceleration is a vector quantity as it has both magnitude as well as direction.The magnitude of acceleration is described by Newton's second law of motion.
Formula of acceleration is change in speed /time.Substituting the given values in the given formula,(11.0-0.0)/3.4=3.235 m/s².
Thus, the acceleration is 3.235 m/s² when Usain Bolt went from 0.0 to 11.0 m/s in 3.4 seconds.
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SUPPER EASY WILL GIVE BRAINLIEST NEED HELP ASAP
7. Which
pocess is an example of a chemical
change?
A. Salt mixes with water and
dissolves.
B. An aspirin tablet is crushed into a fine
powder.
C. Water droplets form on the outside of a
cold drink glass.
D. An antacid tablet is added to water and
bubbles are produced.
Answer:
Your answer will be (D).
Hope this helps!
Answer:
D
Explanation:
You can tell when a chemical change occurs if a gas is produced (bubbles), an odor is produced, if there is a color change, or if the surroundings get hotter or colder.
ssignment (1) Nitrobenzene has a dipole moment of 4.2 x 10-9 esu cm while phenol has a value of only 1.7 x 10-8 esu cm. However, nitrobenzene is soluble only to the extent of 0.0155mole/kg in water while phenol is soluble to the extent of 0.95mole/kgat 20C. explain this phenomenon.
Phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.
Polar molecules tend to be soluble in water. The greater the dipole moment, the greater the polarity of the compound. We can see that Nitrobenzene has a dipole moment of 4.2 x 10-9 esu cm while phenol has a dipole moment of 1.7 x 10-8 esu cm.
Now, It is confusing to observe that the solubility of Nitrobenzene in water is far less than that of phenol despite its higher dipole moment. The reason for this observation is that, phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.
Therefore, phenol is more soluble in pure water as a solvent compared to nitorbenzene.
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what is another extraction that uses gravity filtration and describe it
Answer -ˋˏ ༻༺ ˎˊ-
A common use for gravity filtration is for separating anhydrous magnesium sulfate (MgSO4) from an organic solution that it has dried (Figure 1.68b). Anhydrous magnesium sulfate is powdery, and with swirling in an organic solvent creates a fine dispersal of particles like a snow globe.
help! giving brainliest
Hypothesis of 6. You decide to clean your bedroom. You notice that your floor is covered with clothes.
You try to get rid of the clothes by throwing them into the air. You throw clothes
from 1/3 of the room into the closet and a second 1/3 of the room straight up in
the air. In the last 1/3 of the room, you leave the clothes on the floor. After 30
minutes of “cleaning,” the floor of the room is now visible.
IV: Where clothes are thrown
DV: visible floor
Hypothesis????
Answer: So you could for example say, “IF I through my clothes into the closet. THEN the floor will be visible” I capatlized if and then because you need them in a hypothesis.
Explanation:
Think about the parts of an egg, and write down why you think it can act as a model of an animal cell. Also write down your predictions of what will happen when you leave an egg in vinegar for three days.
Answer:
Explanation:
Determine the treatments you’ll be using on your eggs, and prepare the substances you’ll need. You can make salt-water solutions by dissolving different amounts of table salt in containers of water (e.g. 100g, 200g, 300g of salt (NaCl) per liter). You can make solutions of food coloring by adding a few drops of each color into containers of
The Eggsperiment with Vinegar solution. The first experiment conducted was the egg placed in vinegar solution which allowed the egg to become soft and bouncy . Vinegar is a weak acid which is 5% acetic acid in water (meaning vinegar is largely just water). The egg has a shell that is made up of calcium carbonate an air cell forms at the large end of the egg. While the embryo is growing, the shell membranes surround and contain the white or albumen of the egg. The albumen provides the liquid medium in which the embryo develops, and it also contains a large amount of the protein necessary for proper development. I hope this was hopeful
Why do some hockey players go flying when they are checked?
List key terms associated with the carbon cycle
The main parts of the carbon cycle are photosynthesis, respiration, diffusion, absorption, fossil fuel burning, and land use.
Balance the equation
Ca(s) + H3PO4(aq) ---->Ca3(PO4)2(s) + H2(g)
if 38 gr of water are produced in reaction, how many mole are CO2 are produced.
How many total atoms of Nitrogen are shown in the formula below?
formula in question: 4N20
awnsers for problem
A.2
B.4
C.6
D.8
includes photo
Giveing 50 brainlys to the right awnser
The number of atoms of nitrogen in 4N₂O is 8 atoms.
Atom are the basic or fundamental units of matter that defines its structure.
The atom housed the proton, neutron and electron. The atoms of nitrogen in 4 moles of the Nitrogen oxide is the number of each nitrogen present in it .
Therefore,
4N₂O → Number of atoms of Nitrogen will be 4 × 2 = 8 atoms.
Therefore, the number of atoms of nitrogen in the compound 4N₂O is 8.
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Observe the superscript of N
It's 2Means
There is 2 atoms of N in 1 molecule of Nitric oxideNow as there is 4 multiplied
Total atoms=4(2)=8Stems are important plant structures because they _________.
A.
are the main sites of photosynthesis for plants
B.
are the only site of water and nutrient transport
C.
allow plants to absorb water and nutrients from the soil
D.
give the plant structure and support
Answer:
D
Explanation:
Answer:
for plato users, the answer is: give the plant structure and support
How are mass and weight alike?
A. Both change with gravitational force.
B. Both are measured in pounds.
C. Both depend on how much matter an object has.
D. Both are the same everywhere in the universe.
Answer:
C. Both depend on how much matter an object has.
Explanation:
weight is the gravitational force acting on an object, so it does vary depending on gravity.
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outlines four uses of fat and oil
Fats and oils are used throughout the world for both food applications and industrial uses. They are consumed in butter, shortening, margarine, salad oils, and cooking oils, as well as in animal feeds, fatty acids, soaps, personal care products, biodiesel, paints (made from alkyd resins), lubricants, and greases.
How many grams are contained in the quantity 0.34 mol Ca
Answer:
13.6272 Grams
Explanation:
Moles of Calcium × atomic weight = Grams
0.34 × 40.08 = 13.6272
0.34 Moles of Calcium = 13.6272 Grams
I need help solving the picture
Answer:
213 kJ-1704 kJ852 kJ (ignore what's on my paper, accidentally added a negative)Explanation:
These problems are pretty easy, you just need to do to the enthalpy what is done to the equation itself. Numbers one and 3 are reversed, so they become positive values. When a coefficient changes in the equation, you multiply the enthalpy by that number. I have attached my work below. Let me know if there is any confusion left.
Hope this helped! :^)
identify key concept/terminologies about solution or concentration of solution?
pls help me
thanks~
Answer :
[tex] \: [/tex]
Concentration of Solutions
Recall that a solution consists of two components: solute (the dissolved material) and solvent (the liquid in which the solute is dissolved). The amount of solute in a given amount of solution or solvent is known as the concentration. The two most common ways of expressing concentration are molarity and molality.
Molarity
The molar concentration (M) of a solution is defined as the number of moles of solute (n) per liter of solution (i.e, the volume, V solution):
M = n / V solution
The units of molarity are mol/L, often abbreviated as M.
For example, the number of moles of NaCl in 0.123L of a 1.00M solution of NaCl can be calculated as follows:
[tex]0.123 \: l \: \: of \: solution \: \times \: \frac{1.00 \: mole}{1.00 \: l \: of \: solution \: } \: \\ = 0.123 \: moles[/tex]
Molality :
The molal concentration (m) of a solution is defined as the number of moles of solute (n) per kilogram of solvent (i.e., the mass of the solvent, msolvent):
[tex]m = \frac{n}{v \: solution} [/tex]
For example, the number of moles of NaCl dissolved in 0.123kg of H2O (the solvent), in order to make a 1.00m solution of NaCl, can be calculated as follows:
[tex]0.123 \: kg \: of \: solvent \: = \frac{1.00 \: mole}{1.00 \: kg \: of \: solvent \: } \\ = 0.123 \: moles[/tex]