Answer:
c . Desert
Explanation:
desert biome is character as a drive with temperature ranging from Hot cold and little plant life .
Answer:
desert
Explanation:
the desert does not have a diverse community with animals, is very dry with little precipitation, and is usually incredibly hot but has a cold/warm temperature at night in the winter.
please help againnn!!!!
Answer:
B. covers all body surfaces
Explanation:
epi=upper (outside of skin)
- Hope that helps! Please let me know if you need further explanation.
Select all of the areas of the periodic table that contain elements that form cations in ionic compounds.
The elements on the periodic table that form cations in ionic compounds are primarily found in the alkali metals (group 1), alkaline earth metals (group 2), transition metals and the representative metals. These elements lose electrons to achieve a stable electron configuration and form cations with positive charges.
Explanation:The areas of the periodic table that contain elements which form cations in ionic compounds are primarily the groups that contain metals. These are the alkali metals (group 1), alkaline earth metals (group 2) and transition metals (groups 3-12). These elements lose electrons and form cations with positive charges. For example, an atom of an alkali metal like sodium (Na) loses one electron and forms a cation with a 1+ charge.
Transition elements and post-transition metals can also form cations in ionic compounds. Although their charges can vary, they often lose electrons to achieve a stable electron configuration.
These are termed as representative metals, including aluminum, zinc, and tin, which can exhibit different positive charge magnitudes based on their group and period. For instance, aluminum (Al) from group 13, and zinc (Zn) from group 12, commonly lose 3 and 2 electrons respectively to form cations.
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Which of the following must be true in order for a newly designed product to function properly?
A.
The design must be aesthetically pleasing as well as functional.
B. The construction materials must be compatible with the design and the intended use of the product.
C.
The cost of building the product must be accurately determined, and production stays under budget.
D.
all of these
Answer:
B
Explanation:
How many significant figures are in each measurement?
73,102 L
0.230 mg
603.00 dm
0.002750 m
Answer:
the first is 5
the second is 3
The third is 5
the last one is 4:)
Explanation:
Based on the table above, which of the following is usually the smallest?
A.
a planet
B.
the Sun
C.
a moon
D.
the Solar System
Type the correct answer in the box. Express your answer to two significant figures. An industrial vat contains 650 grams of solid lead(II) chloride formed from a reaction of 870 grams of lead(II) nitrate with excess hydrochloric acid. This is the equation of the reaction: 2HCl + Pb(NO3)2 → 2HNO3 + PbCl2. What is the percent yield of lead(II) chloride?
88.98 %
The Balance Chemical Equation is as follow,
2 HCl + Pb(NO₃)₂ → 2 HNO₃ + PbCl₂
According to equation,
331.2 g (1 mole) Pb(NO₃)₂ produces = 278.1 g (1 mole) PbCl₂
So,
870 g of Pb(NO₃)₂ will produce = X g of PbCl₂
Solving for X,
X = (870 g × 278.1 g) ÷ 331.2 g
X = 730.5 g of PbCl₂
Therefore,
Theoretical Yield = 730.5 g
Also as given,
Actual Yield = 650 g
So using following formula for percentage yield,
%age Yield = (Actual Yield / Theoretical Yield) × 100
Putting values,
%age Yield = (650 g / 730.5 g) × 100
%age Yield = 88.98 %
Brianliest please and thank you.
Final answer:
To find the percent yield of lead(II) chloride, calculate the theoretical yield based on the balanced chemical equation and the given amount of lead(II) nitrate. Then, divide the actual yield by the theoretical yield and multiply by 100% to find the percent yield.
Explanation:
To find the percent yield of lead(II) chloride, we need to compare the actual yield to the theoretical yield. The theoretical yield is the amount of lead(II) chloride that would be formed if the reaction went to completion. The actual yield is the amount of lead(II) chloride that was actually obtained in the experiment. To calculate the theoretical yield, we can use the stoichiometry of the balanced chemical equation.
From the equation, we can see that 1 mole of lead(II) nitrate reacts with 2 moles of hydrochloric acid to produce 1 mole of lead(II) chloride. Therefore, the amount of lead(II) chloride that would be formed from 870 grams of lead(II) nitrate can be calculated as follows:
Calculate the number of moles of lead(II) nitrate:
Use the mole ratio from the balanced equation to calculate the number of moles of lead(II) chloride that would be formed:
Convert moles of lead(II) chloride to grams:
The actual yield of lead(II) chloride is given as 650 grams. To calculate the percent yield, we use the formula:
Percent Yield = (Actual Yield / Theoretical Yield) x 100%
Substituting in the values we found:
Percent Yield = (650 / 748) x 100% = 86.77%
When Holly injures her shoulder playing baseball, she uses an instant ice pack to reduce the swelling. She breaks the inner, activator portion of the instant cold pack releasing the solid urea into the surrounding water. What process does Holly observe as she uses the cold pack? A) Urea absorbs and releases heat energy into the surroundings. B) When the urea dissolves it absorbs heat and the cold pack gets colder. C) The urea causes the surroundings heat up as the cold pack releases energy. D) As the urea mixes in the water it releases heat making the cold pack colder.
Answer:
B) When the urea dissolves it absorbs heat and the cold pack gets colder.
Explanation:
Cold packs usually contains two bags, one contains a water and the other inside is a form of ammonium nitrate as the solid (s) or urea.
Breaking the inner portion activates the instant cold pack thereby releasing the solid urea into the surrounding water makes the urea to react with the water and makes it cold. This is because the reaction that takes place then undergoes an endothermic reaction, Hence heat is absorbed from the surroundings and the cold pack gets colder
The cold pack gets colder as a result of an endothermic reaction where urea dissolves in water and absorbs heat from the surroundings.
Explanation:When Holly activates her instant ice pack by breaking the inner compartment, she initiates an endothermic reaction in which the solid urea dissolves in water. During this endothermic dissolution, the urea absorbs heat energy from the surrounding environment, which includes Holly's injured shoulder. This absorption of heat causes the temperature of the pack and the surrounding area to decrease, thus the pack feels cold to the touch. Therefore, the process that Holly observes as she uses the cold pack is B) When the urea dissolves it absorbs heat and the cold pack gets colder.
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Concentrated HCl is 98% and has density 1.46g/cm 3 what volume of
concentrated acid required to make 2L of 0.25M HCl .
Answer:
12.64 cm^3 to the nearest hundredth
Explanation:
1 L of 0.25M of HCl contains 0.25 * (1.008 * 35.45) g of HCl
= 9.1145 g HCl.
So 2 litres contain 18.229 g HCl.
So we need the volume of concentrated acid which contains 18.229 g HCl.
1.46 * 0.98 = 1.4308 g are in 1 cm^3
So 18.229 g are in 18.229/1.4308
= 12.6404 cm^3 (answer).
The greater the
of a gas at a given temperature, the smaller its volume.
5) Plasma osmolarity is approximately:
a) 300mOsm
b) 0.3 Osm
c) 300 x 10-3 Osm
d) They are all correct
Answer:
a
Explanation:
A substance is made up of slow-moving particles that have very little space between them. Based on this information, what
can most likely be concluded about this substance?
It is not a gas because its particles do not move continuously.
It is a gas because its particles move continuously in a straight line,
O It is not a gas because its particles do not have large spaces between them.
O It is a gas because its particles move in many different directions.
Mark this and return
Save and Exit
Next
Submit
Answer:
It is not a gas because its particles do not have large spaces between them.
Explanation:
All of the following are true about science except (2 points)
it is a body of knowledge.
it can be disproven by philosophy or religion.
it is tested by many scientists over time.
it uses the scientific method.
A common isotope of iron (Fe) has an atomic number of 26 and a mass number
of 56. The total number of subatomic particles in the nucleus is: *
26
Answer:
82
Explanation:
Atomic number of the isotope is 26 and it has a mass number of 56
X = ⁵⁶₂₆Fe
The three main subatomic particles in an atom are
1. Proton
2. Neutron
3. Electron
The number of protons and electrons are usually equal so as to maintain electrical neutrality in the atom except in cases where it's a charged particles hence the number of proton and electrons will differ.
In this case, the atomic number is 26 and atomic numbers are also known as the number of protons (positively charged particle).
Proton = 26
Electrons = 26 (since it's a naturally charged particle)
Neutron = ?
Mass number = sum of proton and neutrons. This variation in the mass number usually leads to isotopes of an atom and this is mainly caused by variation in the number of neutrons eg. Carbon-12 and Carbon-13 have different number of neutrons.
Mass number = protons + neutrons
Neutrons = mass number - protons
Neutrons = 56 - 26
Neutrons = 30
Subatomic particles present are
Protons = 26
Electrons = 26
Neutrons = 30
Total number = (26 + 26 + 30) = 82
The total number of subatomic particles is 82.
The total number of subatomic particles in the nucleus of this common isotope of iron (with an atomic number of 26 and a mass number of 56) is the sum of protons and neutrons, which is 56.
Explanation:An isotope is a variant of an element that has the same number of protons (which is the atomic number) but differs in the number of neutrons. The atomic number of iron (Fe) is 26, which reflects the number of protons in the nucleus. The mass number (56) is the combined total of protons and neutrons in the nucleus. Since we know there are 26 protons (from the atomic number), the remainder must be neutrons. So, 56 (mass number) minus 26 (atomic number) gives us 30 neutrons.
Therefore, the total number of subatomic particles in the nucleus of this isotope of iron is 26 (protons) + 30 (neutrons) = 56 particles in total.
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10. A basic solution of Al(OH)3, has a pH of 9.85, what is the [OH-] concentration of the aluminum
hydroxide solution? *
Answer: The [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pOH is calculated by taking negative logarithm of hydroxide ion concentration.
[tex]pOH=-\log [OH^-][/tex]
Putting in the values:
[tex]9.85=-\log[OH^-][/tex]
[tex][OH^-]=10^{-9.85}=1.41\times 10^{-10}[/tex]
Thus the [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]
Answer: [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].
Explanation:
It is given that pH is 9.85 and the relation between pH and concentration of ions is as follows.
pH = [tex]-log [H^{+}][/tex]
9.85 = [tex]-log [H^{+}][/tex]
antilog (9.85) = [tex][H^{+}][/tex]
[tex][H^{+}] = 7.1 \times10^{-9}[/tex]
We also know that,
[tex][H^{+}][OH^{-}] = 10^{-14}[/tex]
[tex][OH^{-}] = \frac{10^{-14}}{7.1 \times 10^{-9}}[/tex]
= [tex]1.41 \times 10^{-6}[/tex]
Therefore, we can conclude that [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].
Which number is equal to -906,060?
NEWS
-9.0606 x 105
-9.06 x 105
9.06 x 10-5
9.0606 x 10-5
Answer:
answer is point no 9.o6×10-5
Answer:
A
Explanation:
Did it on edge 2020
What did J.J. Thomson’s experiments with cathode ray tubes imply about the mass of an electron?
A. Electrons are many thousand times larger than the nucleus and negatively charged.
B. Electrons are many thousand times smaller than the nucleus and positively charged.
C. Electrons are many thousand times smaller than the nucleus and negatively charged.
D. Electrons are many thousand times larger than the nucleus and possess no charge.
J.J. Thomson's experiments with cathode ray tubes showed that electrons are many thousand times smaller than the nucleus and negatively charged.
Explanation:J.J. Thomson's experiments with cathode ray tubes implied that electrons are many thousand times smaller than the nucleus and negatively charged. Thomson discovered that cathode rays, which were later identified as streams of electrons, were deflected by electric and magnetic fields in a way that indicated they had a negative charge. Furthermore, based on the amount of deflection, Thomson was able to deduce that electrons had far less mass than atoms, leading to the conclusion that electrons are much smaller than the nucleus.
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J.J. Thomson's experiments with cathode ray tubes showed that option C) electrons are many thousand times smaller than the nucleus and negatively charged.
Explanation:J.J. Thomson's experiments with cathode ray tubes implied that electrons are many thousand times smaller than the nucleus and negatively charged. He noticed that the rays in the tube were deflected towards the positive plate, indicating that they possessed a negative charge. By measuring the deflection and applying known magnetic and electric fields, Thomson was able to determine the mass-to-charge ratio of the electron and estimate its mass.
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A sample of a gas occupies 2.76 L at 303K. What would the volume be if the temperature was increased to 404K? Assume constant
pressure and mass.
L Round your answer to the hundredths place.
Blank 1:
Answer:
If the temperature was increased to 404 K, its volume would be 3.68 L.
Explanation:
Charles' Law gives a relationship between the volume and the temperature of the gas at constant temperature. This law states that the volume of a given amount of gas held at constant pressure is directly proportional to the temperature.
[tex]V\propto T[/tex]
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
Let
[tex]V_1=2.76\ L\\\\T_1=303\ K\\\\T_2=404\ K[/tex]
Let [tex]V_2[/tex] is new volume. Using above formula we get :
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{2.76\times 404}{303}\\\\V_2=3.68\ L[/tex]
If the temperature was increased to 404 K, its volume would be 3.68 L.
Charcoal can be soaked in lighter fluid when grilling food. Lighter fluid is extremely flammable. This is an example of which type of property?
Physical property
Chemical property
Both A and B
Neither A nor B
Any one help me on this one
Answer:
0.0679
Explanation:
Anexample of a weak acidis
OH SO.
OH
What is the medium of sound?
water
solids
Ogases
air, liquids, or solids
Answer:
Air, liquids or solids.
Explanation:
Sound is a form of mechanical waves, which needs a material medium to propagate. There is no sound in the void. Sound can be propagated in gases, liquids and solids. The best choice is "Air, liquids or solids".
Distilled vinegar contains a solution of acetic acid (CH3CO2H) in H2O. What is the concentration of the solution that results from diluting 500 ml of 0.839 M vinegar solution to 2.5 L?
A) 0.148 M CH3CO2H
B) 0.168 M CH3CO2H
C) 1.48 M CH3CO2H
D) 1.68 M CH3CO2H
Answer:
it is B 168 It is 100% sure
Explanation:
Akia is balancing the equation Na + H2O NaOH + H2. He tries to find the coefficients that will balance the equation. How could he find the correct coefficients?
Answer:
he can by checking up each person particle and make beyond any doubt the atom numbers are the same within the reactants and the products
Explanation:
i hope this helps
counting up each individual atom and make sure the atom numbers are the same in the reactants and the products
Explanation:
just found it on quizzlet
Potassium hydroxide (KOH) is a strong base
because it
A. easily releases hydroxide ions.
B. does not dissolve in water.
c.
reacts to form salt crystals in water.
D. does not conduct an electric current.
Final answer:
Potassium hydroxide is a strong base because it fully dissociates in water, A. easily releasing hydroxide ions. Potassium hydroxide (KOH) is a strong base because it easily releases hydroxide ions (OH-). When dissolved in water, KOH dissociates completely into K+ and OH- ions, increasing the concentration of hydroxide ions in the solution.
Explanation:
Potassium hydroxide (KOH) is considered a strong base because when it dissolves in water, it completely dissociates into potassium ions (K+) and hydroxide ions (OH-). This complete ionization in solution is characteristic of a strong base. Wrapping up, the correct answer to why KOH is a strong base is that it easily releases hydroxide ions into the solution.
Final answer:
Potassium hydroxide (KOH) is a strong base because it completely dissociates into potassium ions (K+) and hydroxide ions (OH-) in water, easily releasing hydroxide ions. This complete ionization defines its strength as a base and sets it apart from weak bases, which do not fully ionize.
Explanation:
Potassium hydroxide (KOH) is characterized as a strong base because it easily releases hydroxide ions when dissolved in water. The dissolution of KOH in water is a highly exothermic process where it dissociates completely into potassium (K+) and hydroxide (OH-) ions. This characteristic of complete ionization in solution is what defines a strong base, in contrast to weak bases that only partially ionize.
Unlike substances that do not dissolve well or do not conduct electricity, KOH is very soluble in water and is a good electrical conductor due to the movement of ions. Strong bases like KOH are important in various industrial processes due to their reactivity toward acids and their corrosive nature.
Understanding the behavior of strong bases can be crucial in areas such as acid-base chemistry, titrations, and pH calculations. Potassium hydroxide's complete dissociation into ions is typical of soluble metal hydroxides and is an indicator of its strength as a base.
Please help. Is it A.
B.
C.
Or
D.?
Answer: d
Explanation: i got it right on acellus
Using your knowledge of the difference
between the three different temperature scales,
what do you think would happen if a human's
body temperature were 98.6 °C? Why do
doctors worry more about a fever of a couple
of degrees Celsius than a fever of a couple of
degrees Fahrenheit?
Select the phrase that completes each statement
Honey is
Grape juice is
Sand on the beach is
A mixture of carbon dioxide and nitrogen
gases is
Rubbing alcohol is
Answer:
Honey is ------ A mixture and a solution
Grape Juice is ------ A mixture and a solution
Sand on the beach is ----- A mixture but not a solution
A mixture of Carbon Dioxide and nitrogen gases is ----- A mixture and a solution
Rubbing Alcohol is ----- A mixture and a solution
Explanation:
Please put 5.0 stars so other ppl know its corrrect :D
They're correct^^^
The next question:
Question:
Select the term that completes each statement.
When acetic acid is dissolved in water to make vinegar, acetic acid is the
When a small amount of carbon is dissolved in iron to make steel, the iron is the
When a small amount of hydrogen gas mixes with nitrogen gas, hydrogen is the
When carbon dioxide gas dissolves in water, water is the
When a small amount of solid iodine is mixed with ethanol, ethanol is the
Answer:
solute
solvent
solute
solvent
solvent
Explanation:
edge :) have a lovely day!
and thank you for the answers to the first one lovely person above me <3
Calculate the volume of a 0.323-mol sample of a gas at 265 K and
0.900 atm.
Answer:
V = 7.8 L
Explanation:
Message
The volume of gas of 0.323 mole sample of a gas at 265 K and 0.900 atm is 7.798L.
What is ideal gas equation?Ideal gas equation gives idea about the behavior of gas at different condition & represented as:
PV = nRT, where
P = pressure = 0.9 atmV = volume = ?n = moles = 0.323 molR = universal gas constant = 0.082 L.atm / K.molT = temperature = 265KOn putting all these values on the above equation, we get
V = (0.323)(0.082)(265) / (0.9) = 7.798 L
Hence required volume of gas is 7.79L.
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How many joules of energy would it take to raise the temperature of 2.5 grams of magnesium metal from
25°C to 50°C
Report your answer with two significant digits, leave a space, and add the unit.
Answer:
Q = 63.75J
Explanation:
Mass = 2.5g
Initial temperature (T1) = 25°C
Final temperature (T2) = 50°C
Specific heat capacity of Mg = 1.020J/g°C
Heat energy = ?
Heat Energy (Q) = mc∇T
Q = heat energy
M = mass of substance
C = specific heat capacity of substance
∇T = change in temperature = T2 - T1
Q = mc∇T
Q = mc(T2 - T1)
Q = 2.5 × 1.020 × (50 - 25)
Q = 2.55 × 25
Q = 63.75J
The heat energy required to raise magnesium metal from 25°C to 50°C is 63.75J
The two isotopes have the same number of _______ within the nucleus.
Answer:
The two isotopes have the same number of protons within the nucleus.
Explanation:
Answer:
Protons
Explanation:
Odyssey ware