Answer:
anther is not a part of the flower pistil
Harry dissolved 9.36 g sample of LiOH into water in a calorimeter. The temperature of the calorimeter rose from 36.9 degrees Celsius to 52.8 degrees Celsius. The heat capacity of the calorimeter and its contents is 639 J/ degC. What is the enthalpy for the solution process if Harry repeats the lab again and 2.85 mol of the LiOH was dissolved? Given: the molar mass of LiOH is 23.95 g/mol.
Carbon dioxide is returned to the atmosphere primarily by the
A)
eruption of volcanoes.
B)
respiration of consumers.
9.
fallout from solar flares.
D)
process of photosynthesis.
Answer:c or d
Explanation:
Answer:
yall its b
Explanation: cus i took the tested
after searching for artificial sweeteners, do you think it is appropriate to have diet pop available in your school?
who organized elements according to increasing atomic mass
Answer:
Mendeleev
Explanation:
PLZ HELP, NO MESSING AROUND, WILL GIVE BRAINLIEST!
Covalent bond is a type of chemical bond which is due to the sharing an electron from each and every atom that is participating in the bond.
Ionic Bond:Ionic bond is a type of bond which is formed due to the complete donation of an electron from one atom to another.
Ionic bond is formed between metals and non-metals. The group which provide the Metal are IA and IIA i.e. S block elements. The group which mostly provide non-metal is VII A i.e. halogens. The Metals give up their ONLY Valance shell electron which is accepted by the Non-metal. This results in formation of ions, The Metals gets the positive charge thus called cation and The non-metal gets a negative charge thus called anion. These Positive and Negative ion attract each other resulting in the formation of IONIC BOND.
_____________________________________The Ionic bond is formed between The metal and non metal because, the metals have low ionization energy due to which the valence shell is ejected out easily, and The Non-Metals have high electron affinity which means that they attract an electron with greater force because they need one electron to complete their octet. As the non metal has high electron affinity and metal have low electron affinity thus the electronegativity difference between the non metal and metal is more than 2 thus they make ionic bond.
_____________________________________Rule of Electronegativity:Electronegativity is the tendency of an atom to attract shared pair of electron. If there is electronegativity difference between the two atom more than 2 then it makes IONIC BOND. If the electronegativity difference is less than 2, it makes COVALENT BOND.
_____________________________________Question:The question says, the KCl has ionic bond but HCl has covalent bond, why?
Answer:Answer is that KCl has electronegativity difference between K and Cl atom more than 2 thus it forms ionic bond. H and Cl has electronegativity difference of less than 2 thus it makes Covalent Bond. K donates its valence electron completely to the Chlorine atom because chlorine has much more electronegativity than potassium(K). H shares an electron with chlorine, it is not completely donated. H has pair of electron for sometime and chlorine has pair of electron for sometime, It is because the Chlorine and Hydrogen has less difference of electronegativity so they attract with almost same electronegativity.
_____________________________________Best Regards,'Borz'A rigid cylinder with a movable piston contains a sample of hydrogen gas. At 350.
K, this sample has a pressure of 210. kPa and a volume of 9.50 L. What is the
volume of this sample at STP? (Round your answer to correct number of sig figs)
Answer: The volume of this sample at STP is 15.4 L
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 210 kPa
[tex]P_2[/tex] = final pressure of gas = 101.3 kPa ( at STP)
[tex]V_1[/tex] = initial volume of gas = 9.50 L
[tex]V_2[/tex] = final volume of gas = ? ( at STP)
[tex]T_1[/tex] = initial temperature of gas = 350 K
[tex]T_2[/tex] = final temperature of gas = 273 K ( at STP)
Now put all the given values in the above equation, we get:
[tex]\frac{210\times 9.50}{350}=\frac{101.3\times V_2}{273}[/tex]
[tex]V_2=15.4[/tex]
The volume of this sample at STP is 15.4 L
an electrical current only moves through a ____ circuit.
1.broken
2.new
3.closed
4.open
Answer:
Closed
Explanation:
What does water's polarity cause?
An example of a physical change is
A) crushing a rock
B) shirt fading in the sun
(From USATESTPREP)
Answer:
A: Crushing a Rock
Explanation:
The rock is physicially being broken down and turned into either smaller pieces of rock or dust if you pound it hard enough.
Answer:
the answer is a) crushing a rock because even though you broke it, its still a rock just in smaller pieces. B is not the answer because its a chemical change. The shirt is losing colour and you can't reverse it.
Homework: Earth's Outer Layer
You have been investigating the question What is the land like underneath Earth's surface?
Use the map below to show your thinking about this question. Show where Earth's outer layer is
made of hard, solid rock by shading those regions.
Answer:
It goes the crust mantle outer core and inner core. The crust is what we are standing on it has dirt, rock, stone, the mantle it has lots of silicate rocks and magnesium. The outer core has liquid nickel and iron and the inner core has solid metals
Mantle and core layers are present underneath Earth's surface.
The land underneath Earth's surface has mantle, outer core and inner core. The surface of the earth is the crust which is solid and hard. This surface of earth becomes hard due to cooling of the surface with the help of environmental conditions.
Mantle layer of earth has high temperature than crust whereas the inner and outer core is more hotter than mantle where all the materials are present in liquid state so we can say that inside the earth mantle and core layers are present.
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Which balanced equation BEST describes this reaction?
Answer:
Explanation:
It is 1.
Answer:
2Al + 5 Br2-----> 2AlBr3 + 2Br2
Explanation:
Write the electron configuration for Gold
Answer:
[Xe] 4f145d106s1
Explanation:
What causes some atoms of the same element to have different atomic masses?
Answer:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
Hope it helped
What is the outcome of all chemical changes when two substances are combined?
A. A new substance forms with identical properties.
B. The two substances release an odor.
C. The two substances change color.
D. A new substance forms with different properties.
Answer:
D
Explanation:
Because when you combine chemical substances they create a new substance unlike physical substances .
Answer:
D- A new substance forms with different properties
Explanation:
When a chemical change occurs, it causes the matter to form into a completely new substance. Because of this, the new substance will have different properties than the original substance. Options B and C are true for some chemical changes, but not all changes. Option A is incorrect because the substance has different properties than the original substance. Thus, Option D is correct.
- I took the quiz and got 100%
Hope this helps!
What is the classification of igneous rock which forms from lava on the earths surface?(Why is there no option for Geology for the subject thing btw)
Answer:
Extrusive and intrusive are the two major types of igneous rocks. On the Earth's surface, extrusive rocks are created from lava, which is magma that has erupted from the underground. Intrusive rocks are formed from magma within the planet's crust that cools and solidifies.
Explanation:
Yeet
Someone answer the limited regent...
Answer:
20 g Ag
General Formulas and Concepts:
Chemistry - Stoichiometry
Using Dimensional AnalysisChemistry - Atomic Structure
Reading a Periodic TableExplanation:
Step 1: Define
[RxN] Cu (s) + AgNO₃ (aq) → CuNO₃ (aq) + Ag (s)
[Given] 10 g Cu
Step 2: Identify Conversions
[RxN] 1 mol Cu = 1 mol Ag
Molar Mass of Cu - 63.55 g/mol
Molar Mass of Ag - 197.87 g/mol
Step 3: Stoichiometry
[tex]10 \ g \ Cu(\frac{1 \ mol \ Cu}{63.55 \ g \ Cu})(\frac{1 \ mol \ Ag}{1 \ mol \ Cu} )(\frac{197.87 \ g \ Ag}{1 \ mol \ Ag} )[/tex] = 16.974 g Ag
Step 4: Check
We are given 1 sig fig. Follow sig fig rules and round.
16.974 g Ag ≈ 20 g Ag
An example of matter made up of only one type of element is
Answer:
Carbon, in all its states of matter.
Explanation:
Margie used arrows to represent the gases that enter and leave a plant during the process of photosynthesis, as shown below.
Answer:
the last one
Explanation:
Answer:
D
Explanation:
Which is a difference between animal populations in primary succession and secondary succession?
A.
Animals can be present during the start of secondary succession, but they are never present during the start of primary succession.
B.
There is more animal biodiversity after the process of secondary succession has been completed.
C.
There is more animal biodiversity after the process of primary succession has been completed.
D.
Animals can be present during the start of primary succession, but they are never present during the start of secondary
Answer:
this may help
Explanation:
in primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area that was previously occupied by living things is disturbed, then re-colonized following the disturbance.
Animals can be present during the start of secondary succession, but they are never present during the start of primary succession is a difference between animal populations in primary succession and secondary succession. Therefore, option A is correct.
What is primary succession ?When a new piece of land is produced or is first exposed, primary succession occurs. This may occur, for ex., when lava solidifies and forms new rocks or when a glacier recedes and reveals bare rocks. In the initial succession.
Primary succession takes place in a habitat that has never supported life. In a region that was formerly populated but had a disturbance, such a wildfire, secondary succession happens. In this case, dirt would still exist.
In primary succession, living organisms first occupy newly exposed or newly created rock. In secondary succession, a previously inhabited region is disrupted, then recolonized as a result of the disturbance.
Thus, option A is correct.
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The half life for uranium-235 is 7.0x10 8years. a. How many half-lives did the sample go through at the end of 2.8x10 9years? b. How much of a 0.74mg sample of uranium-235 will remain after 2.8x10 9years?
Answer:
A 4 half-life
B. 0.05 mg
Explanation:
A. Determination of the number of half-lives after 2.8×10⁹ years.
From the question given above,
7×10⁸ years = 1 half life
Therefore
2.8×10⁹ years = 2.8×10⁹ years × 1 half life / 7×10⁸ years
2.8×10⁹ years = 4 half life
Thus, the sample went through 4 half-lives at the end of 2.8×10⁹ years.
B. Determination of the amount of the sample remaining after 2.8×10⁹ years.
Original amount (N₀) = 0.74 mg
half life (t½) = 7×10⁸ years
Time (t) = 2.8×10⁹ years
Amount remaining (N) =?
Next, we shall determine the rate of disintegration. This can be obtained as follow:
half life (t½) = 7×10⁸ years
Decay constant (K) =?
K = 0.693 / t½
K = 0.693 / 7×10⁸
K = 9.9×10¯¹⁰ /year
Finally, we shall determine the amount remaining as follow:
Original amount (N₀) = 0.74 mg
Time (t) = 2.8×10⁹ years
Decay constant (K) = 9.9×10¯¹⁰ /year
Amount remaining (N) =?
Log (N₀/N) = kt / 2.303
Log (0.74/N) = 9.9×10¯¹⁰×2.8×10⁹ /2.303
Log (0.74/N) = 2.772 / 2.303
Log (0.74/N) = 1.2036
Take the antilog of 1.2036
0.74/N = antilog (1.2036)
0.74 / N = 15.98
Cross multiply
0.74 = N × 15.98
Divide both side by 15.98
N = 0.74 / 15.98
N = 0.05 mg
Thus, 0.05 mg of the sample will remain after 2.8×10⁹ years
The amount of uranium sample remained after 4 cycles in [tex]\rm 2.8\;\times\;10^9[/tex] years has been 0.04625 mg.
The half-life can be described as the time required by the element to reduce to its half concentration from the initial concentration.
A. The number of half-life cycles can be calculated as:
[tex]\rm 7.0\;\times\;10^8[/tex] = 1 cycle
[tex]\rm 2.8\;\times\;10^9[/tex] = [tex]\rm \dfrac{1}{\rm 7.0\;\times\;10^8}\;\times\;2.8\;\times\;10^9[/tex]
= 4 cycles.
The number of half-life cycles after [tex]\rm 2.8\;\times\;10^9[/tex] years are 4 cycles.
B. The amount of sample remained can be calculated as:
Sample remained = Initial sample [tex]\rm \times\;\dfrac{1}{2}^\frac{time}{Half-life}[/tex]
Sample remained = 0.74 mg [tex]\rm \times\;\dfrac{1}{2}^\frac{2.8\;\times\;10^9}{7.0\;\times\;10^8}[/tex]
Smaple remianed = 0.74 [tex]\rm \times\;\dfrac{1}{2}^4[/tex]
Sample remained = 0.74 [tex]\times[/tex] 0.0625 mg
Sample remained = 0.04625 mg.
The amount of uranium sample remained after 4 cycles in [tex]\rm 2.8\;\times\;10^9[/tex] years has been 0.04625 mg.
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Explain how the rock cycle works.
Be sure to include the name of each type of rock in your description.
(Igneous rock, metamorphic rock, and sedimentary rocks)
Which sphere is dependent on all the other spheres in order to exist?
hydrosphere
lithosphere
atmosphere
biosphere
Answer:
biosphere
Explanation:
Living things need water (hydrosphere), chemicals from the atmosphere, and nutrients gained by eating things in the biosphere.
Help ASAP
Avocados have a pH of 6.27. Avocados are categorized as...
O Base
O An Acid
O Neutral
Answer:
Base
Explanation:
Can some please help me fast!!?
Answer:
Last one
Explanation:
Alligators are the large predators that eat many smaller animals in a swamp how might removing the alligators from a swamp habitat create a decrease vegetation
Benzene has been used as a solvent for waxes and oils. In 1981 the EPA listed benzene as a carcinogen. What is the molecular formula of benzene if the empirical formula is C1H1, and the approximate molar mass is 78 g/mol
Answer:
C₆H₆
Explanation:
From the question given above, the following data were obtained:
Empirical formula = CH
Molar mass of compound = 78 g/mol
Molecular formula =?
The formula of the compound can be obtained as follow:
Molecular formula = n × Empirical formula
Molecular formula = ₙ[CH]
n[CH] = 78
n[12 + 2] = 78
14n = 78
Divide both side by side 14
n = 78/14
n = 6
Molecular formula = ₙ[CH]
Molecular formula = ₆[CH]
Molecular formula = C₆H₆
Thus, the molecular formula of the compound is C₆H₆
what is represented on the periodic table by number 4
Answer:
there is nothing there?
Explanation:
Write three sentences that provide evidence supporting your claim about how the illustration and student observations support the cell theory?
Answer:
The cell theory claims these three components:
1. cell is the smallest functional unit of life: It can be observed under the microscope that cells have various type of molecules and organelles present and have adifferent functional role in the cell which explains that the cell is the smallest unit of life as its molecules or organelles can not carry the life process on their own.
2. All organisms are made up of cells: From bacteria and archaea to human and other life forms are made up of a single cell or organization of cells in a specific pattern it also can be observed by the microscopic of blood or other tissue or cell of an organism.
3. Arise from pre-existing cell: The cells are can be studied under a microscope during cell division where we can observe that new cells come from the pre existing cell by the cell division.
2. Vitamin C is known to contain 1.20X1024 hydrogen atoms. Calculate the number of moles of hydrogen
The number of moles of Hydrogen : 1.993
Further explanationGiven
1.20 x 10²⁴ hydrogen atoms
Required
The number of moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated :
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
moles of Hydrogen :
[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.2\times 10^{24}}{6.02\times 10^{23}}\\\\n=1.993~moles[/tex]
True or false: Parasites help their host by providing nutrients to them
Answer:
true
Explanation:
Answer:
False..
Explanation: parasites do not provide you with anything good. The parasite obtains nutrition directly from the body of the host
