Answer:
Thick layer of body fat for food storage and insulation
Explanation:
Polar bears store food for themselves and so do camels. Option B is not correct because bears do not definitely have small surface area and even if camels do they do not need to reduce heat loss because they stay in the deserts. For option C polar bears have thick fur and much body fat to protect itself from the cold. Lastly D cannot be true because camels don't normally have large feet they have small padded foot.
What is the molarity of 4 g of NaCl in 3,800 mL of solution?
Answer:
.018 M
Explanation:
Mole weight of NaCl (from periodic chart) = 58.44 g /mole
4 g / 58.44 gm/mole = .06845 mole
.06845 mole / (3.8 liter ) = .018 M
For the reaction 2N2O5(g) → 4NO2(g) + O2(g) which of the following expressions is equal to the rate of the reaction?
Answer:
Rate=k[N2O5]^2
Explanation:
It is more accurate to determine the rate law using experimental data instead of stoichiometry. The answer I just gave was derived from stoichiometry.
The correct expression for the rate of the reaction [tex]\rm 2N_2O_5(g) ---- > 4NO_2(g)[/tex]+ O2(g) is Rate = Δ[[tex]\rm N_2O_5[/tex]] / (2Δt). Therefore, the correct option is B.
In the chemical equation, 2 moles of [tex]\rm N_2O_5[/tex]result in 4 moles of [tex]\rm NO_2[/tex]. The rate expression for the reaction can be expressed on the basis of stoichiometry as follows:
Rate = -Δ[[tex]\rm N_2O_5[/tex]] / (2Δt)
Because of the stoichiometric coefficient of 2, this expression shows that the rate of reaction is equal to the rate of decomposition of [tex]\rm N_2O_5[/tex]divided by 2. Since [tex]\rm N_2O_5[/tex]is a reactant in the forward process, the negative sign means that its concentration is decreasing with time. ,
Therefore, the correct option is B.
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Your question is incomplete, most probably the complete question is:
For the reaction 2N2O5(g) → 4NO2(g) + O2(g) which of the following expressions is equal to the rate of the reaction?
A) Rate = -Δ[N2O5] / Δt
B) Rate = Δ[N2O5] / (2Δt)
C) Rate = -Δ[NO2] / Δt
D) Rate = Δ[NO2] / (4Δt)
HELP ME OUT PLS!!!!!!!!!
All stars begin their life in a
O black hole
O main sequence
O protostar
O nebula
nebula
↪ExplanationAll stars start in a large cloud of dust and gas called a nebula. Gravity can pull some of the gas and dust in a nebula together, forming a proto-star. A star is born when the gas and dust from a nebula become so hot and dense that hydrogen atoms are smashed together to form helium.
hope this helps...
what major organic product would you expect to obtain when acetic anhydride reacts with ch3ch2ch2oh nh3
The major product of the reaction between acetic anhydride and CH3CH2CH2OH is CH3COOCH2CH2CH3. While, the major product of the reaction between acetic anhydride and NH3 is CH3CONH2.
What is acetic anhydride?Acetic anhydride is the compound (CH3COO)2. It is a precursor for the synthesis of many organic compounds.
Now let us consider the use of acetic anhydride in synthesis. The major product of the reaction between acetic anhydride and CH3CH2CH2OH is CH3COOCH2CH2CH3. While, the major product of the reaction between acetic anhydride and NH3 is CH3CONH2.
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Which of the following is an example of chemical weathering?
A. A river carrying dirt into a lake.
B. Wind carrying sand from a beach.
C. Chemicals in water dissolving minerals in rock.
D. Friction between two rock surfaces grinding away minerals.
Answer:
C
Explanation:
Answer: D. Friction between two rock surfaces grinding away minerals.
Explanation: chemical weathering involves erosion from rocks/materials
What type of microorganism turns milk into yogurt?
For yogurt production, probiotic bacteria and the Streptococcus thermophilus strain work together to produce a stable balance of bacteria in the culture.
Haley recorded several notes in her lab journal about the experiment. Which of her notes below is an interpretation of the data that she collected?
Answer:
picture
Explanation:
i need the picture
we need a picture to
answer this sire
A sample of gold has a mass of 38.6 grams and a volume of 2cm. What is the density of gold?
mass of the sample gold= 38.6g
volume =
[tex]2 {cm}^{3} [/tex]
to find:the density of the gold.
solution:D = m/V
[tex]m = 38.6g[/tex]
[tex] = 0.0386kg[/tex]
[tex]v = 2 {cm}^{3} [/tex]
[tex] = 0.000002 {m}^{3} [/tex]
then substitute the values.
[tex]d = \frac{0.0386}{0.000002} [/tex]
[tex]d = 19300kg | {m}^{3} [/tex]
therefore, the density of the sample gold is 19300kg/m3
Matter is made of atoms that have positive centers of neutrons and protons
surrounded by a cloud of negatively charged electrons.
This statement is...
Answer:
the statement is a theory
Explanation:
A 25.0-L balloon at 20.0 ⁰C is placed in a hot water bath at 90 ⁰C. After 15 minutes, the volume of the balloon stops expanding. What is the new volume of the balloon?
Apply Charles law
V1T2=V2T125(90)=20V225(9)=2V2225=2V2V2=225/2V2=112.5LWrite a net ionic equation for the reaction that occurs when excess hydroiodic acid and chromium(II) carbonate (s) are combined.
Step 1: Write the balanced "molecular equation:
[tex]2HI(aq) + CrCO₃ (s) → CrI₂ (s) + H₂O(l) + CO₂(g)[/tex]
Step 2: Carbon dioxide and water are written in molecular form. Consult the solubility and net ionic equation rules on the information page to determine which of the other substances will dissociate:
[tex]2HI(aq) + CrCo₃ (s) → Crl₂ (s) +H₂O(l)+CO₂(g)[/tex]
yes no yes
Step 3: Dissociate all soluble salts, strong acids, and strong bases (except calcium hydroxide), Leave together all "not soluble" salts and weak acids or bases:
[tex] {2H₂O}^{ + } (aq) + {2I}^{ - } (aq) + CrCO₃ (s)→ {Cr}^{2 + } (aq) + {2I}^{ - }(aq) + 3H₂O(l) + CO₂(g)[/tex]
Step 4: Cross out "spectator lons that appear on both sides of the reaction (these lons do not participate in the chemistry) and rewrite the "net" reaction using the smallest possible coefficients:
[tex] {2H₂O}^{ + } (aq) + CrCO₃ (s) →3H₂O + CO₂ + {Cr}^{2 + } [/tex]
Aerobic decomposition of organic matter requires
A.nitrogen.
B.oxygen.
C.carbon dioxide.
D.water.
Answer:
Option B: Oxygen.
Explanation:
Hope this helped.
Without conducting an experiment, how could you predict if a species in a solution is acidic or basic? Give some examples.
Without conducting an experiment, one can determine if a species in a solution is acidic or basic by using a litmus paper.
Litmus testAcidic species would turn a blue litmus paper to red but have no effects on red litmus paper.
Basic species would turn a red litmus paper to blues but have no effects on blue litmus paper.
Thus, in order to determine if a species in a solution is acidic or basic without conducting any experiment, dipping a litmus paper into the solution would give an indication.
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Which chemical symbol describes an element? C2H6 Cl2 H2O2 CuSO4
Answer:
Cl2
Explanation:
Chlorine is a diatomic element so it is Cl 2
the others are MOLECULES (made up of atoms of ELEMENTS)
Which of the following compounds will have the lowest molar solubility in pure water?
a-AgBrO3, Ksp = 5.38 x 10-5
b-MnCO3, Ksp = 2.24 x 10-11
c-Hgs, Ksp = 1.60 x 10-54
d-Zns, Ksp = 2.00 x 10-25
e-SrS04, Ksp = 3.44 x 10-7
Answer:
C
Explanation:
It has the lowest Ksp, so it will have the lowest Molar Solubility
What is the solubility of MgCO₃ in a solution that contains 0.080 M Mg²⁺ ions? (Ksp of MgCO₃ is 3.5 × 10⁻⁸)
Answer: 4.4 x 10^-7
Explanation:
The dissociation equation for this reaction is:
MgCO3 (s) → Mg+2 (aq) + CO3-2 (aq)
[tex]\text { So, } k_{s p}=(x+0.08) x[/tex] (Here 0.08 >>> x )
[tex]\begin{aligned}\Rightarrow 3.5 \times 10^{-8} &=0.08 \times x \\\Rightarrow x &=\frac{3.5}{0.08} \times 10^{-8} \\&=4.37 \times 10^{-7} \\\Rightarrow x & \approx 4.4 \times 10^{-7} \mathrm{~M}\end{aligned}[/tex]
So the solubility MgCO₃ in a solution that containing 0.080 M Mg²⁺ is 4.4 x 10^-7
Can marble turn back into limestone?
Answer:
the alteration of limestone by heat and pressure.
Explanation:
Answer:
YES :)
Explanation:
How does marble turn back into Limestone?
»MARBLE is a Metharopic rock formed by the alternation of Limestone by heat and pressure
»The calcite in the limestone changes and fosills and layering in the original limestone disappear as interlocking grains grow.
»If the limestone is pure ,a white marble is formed
activity acid bases solutions project need help !!!!
1. Acids have highest concentration of hydronium ions.
2. Bases have highest concentration of Hydroxide ions
3. a. less than 7 b. more than 7
4. Acids (Presence of hydronium ions)
You need Conclusions too?
Determine the number of atoms in 30.0g of Ne
What are the names of the compounds below?
Answer:
See below ~
Explanation:
a. 3-hydroxy, 3-methyl hexaneb. 3-methyl butanolc. Methoxy methaned. Propoxy ethanee. Ethoxy methane#1
Here the functional group attached is OH(Alcohol) so we need to use -ol suffix
There are total 6 carbons in the straight chain .Naming should be started from functional group.At max there can be 4carbons in the chain then on left hand sideRight hand side is 2 carboned substituent i.e it's ethyl group
Hence the naming is
2-ethyl-2-methyl butanol#2
Start numbering from alcohol towards left end .
4 carbons chainPent prefix to be usedThe name is
3-methyl-butanol#3
O is at centre and two methyl groups are branched both sides
Methoxy Methane#4
O is at centre,left side propane ,right side methane
Propoxy ethane#5
Left side ethane,Centred O,Right side methyl.
Ethoxy methaneWhich answer best describes this reaction?
C is bonded above, left, and below to H, and right to a second C bonded above and below to H and to the right to a third C. That third C is double bonded above right to O and below right to O bonded to H + H bonded to O bonded to C bonded above and below to H and to the right to C. Also bonded above, below, and to the right to H right arrow C is bonded above, left, and below to H, and right to a second C bonded above and below to H and to the right to a third C. That third C is double bonded above right to O and below right to O. That O is bonded to C bonded above and below to H and to the right to C, bonded above, below, and right to H + H Subscript 2 Baseline O.
formation of an ester by condensation
formation of an ether by condensation
formation of a new product using a substitution reaction
formation of a new product using an addition reaction
Answer:
formation of an ester by condensation
Explanation:
Edge 2022
Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation.
What is condensation?A condensation reaction is one in which a new compound is formed by the loss of a small molecule such as water from the two reacting compounds.
Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation. Hydrogen ion is lost from the first compound and -OH from the second one which is an instance of condensation.
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what happens when muscle cells are triggered?
Answer:
When myocytes (aka muscle cells) are triggered at a certain point for awhile it can cause strain and pain throughout the muscle.
10 POINTS!
What stops beta particles?
skin
aluminum foil
paper
air
Answer:
The answer is aluminum foil.
Answer:
aluminum foil Mark me brainliest, please.When 3.00 g of hydrogen reacts with 4.00 g of oxygen, 4.00 g of water is formed.
(a) What is the limiting reactant?
(b) What is the theoretical yield?
(c) What is the percent yield?
Question 11 options:
a)
(a) oxygen
(b) 4.51 g
(c) 88.7 %
b)
(a) hydrogen
(b) 4.51 g
(c) 88.7 %
c)
(a) oxygen
(b) 4.05 g
(c)13.0 %
d)
(a) hydrogen
(b) 4.05 g
(c) 13.0 %
Answer:
Answer A
Explanation:
2 H2 + O2 = 2 H2O
knowing the mole weights of these elements shows O2 is the limiting reactant in this situation.
4 g oxygen is 4 /31.998 = .125 mole O2
We should get two times these moles of water = .250 moles
weight = .250 (1.008 * 2 + 15.999) = 4.50 gm H20 (theoretical)
....but we only got 4 gm
4/4.50 = 88.8%
Step 1: Pick your favorite physical activity This can be almost anything! Try to pick an activity that you like to participate in, but you can pick anything you want. It could be hockey, tennis, wakeboarding, dancing, rock climbing, or even walking your dog! Almost ANY activity will work for this assignment. Step 2: Research the activity Get on the internet and learn about the activity you selected. Step 3: Write a brief report - 2 full paragraphs Be sure to include the following information in your report: - What activity you selected and why you selected it. - 2 health benefits of your activity. - 3 different muscles that your activity uses or "works out." - If participating in your activity presents any safety concerns. When you have finished your 2 full paragraphs, submit your assignment here!
Dancing is a physical activity which strengthens the abdominal and calf muscles as well as improves flexibility.
What is a physical activity?A physical activity is any activity which involves movement of the body in order to strengthen the muscles and to be physically fit.
Dancing is a physical activity which involves intricate and repeated movements of the body.
Dancing is beneficial because;
it helps to relieve stress it improves flexibility it builds muscle enduranceSome muscles involved in dancing include;
The abdominal muscles The quadricepsthe glutesSome risks in dancing include muscle injuries, dislocations and possibly fractures due to falls.
Therefore, a dancing routine strengthens the abdominal and calf muscles as well as improves flexibility.
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6.11C In 1976, the Viking I Lander was sent to Mars to analyze atmospheric gases and soil samples. The Viking I Lander was most likely a
a space probe.
b lunar module.
c space shuttle.
d natural satellite.
what is the molar mass of slicon
Answer:
28.0855 grams per mole
What is the molarity of a solution that has 175 g of LICI in 1085 mL of solution?
Answer:
3.8 M
Explanation:
Mole weight of LiCl = 6.94 + 35.45 = 42.39 ( from periodic table)
175 g of this is then 175 / 42.39 = 4.13 moles
4.13 moles / (1085/1000) = 3.8 M
5. When you breathe, your lungs absorb oxygen
and release carbon dioxide. Which of these are
your lungs releasing?
(1) O
(2) O2
(3) CO
(4) CO2
(5) NH3
How many electrons are in an atom of nitrogen (N)?
The Periodic Table
A. 2
B. 7
C. 14
D. 5
Answer:
There are 7 electrons in the nitrogen atom two in k shell and 5 in l shell
Explanation:
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