Answer:
you tell me
Explanation:
What parts of the body make up the immune system?
Answer:
The immune system is made of lungs, liver, intestine, bone marrow, tonsils, adenoids.Spleen, appendix, lymph nodes, and nodes.
Explanation:
what's the molecular geometry of SiCI4
Answer:
Tetrahedral shape
Explanation:
The compound SiCl₄ has a molecular geometry of a tetrahedral shape. The shape of compound can be predicted using the valence shell electron pair repulsion theory model.
The total electron pair around the central atoms is 4. The number of bond pairs is 4. Lone pair is zero.Explain the importance of camera focus in making good forensic pictures
Answer:
Depth of field, often called the plane of sharpness, is the area in a photograph where objects are in sharp focus. Crime scene and evidence photographs should have as much in focus as possible (a deep plane of sharpness). This is because out of focus areas of a photograph can become issues in court.
Explanation:
Hope this helps!
what is the weight of calcium oxide obtained from igniting 3.2g of calcium oxalate
Answer:
1.4 g
Explanation:
Step 1: Write the balanced combustion reaction
CaC₂O₄ + 1/2 O₂ ⇒ CaO + 2 CO₂
Step 2: Calculate the moles corresponding to 3.2 g of CaC₂O₄
The molar mass of CaC₂O₄ is 128.10 g/mol.
3.2 g × 1 mol/128.10 g = 0.025 mol
Step 3: Calculate the moles of CaO formed from 0.025 moles of CaC₂O₄
The molar ratio of CaC₂O₄ to CaO is 1:1. The moles of CaO formed are 1/1 × 0.025 mol = 0.025 mol.
Step 4: Calculate the mass corresponding to 0.025 moles of CaO
The molar mass of CaO is 56.07 g/mol.
0.025 mol × 56.07 g/mol = 1.4 g
A list of all parts and materials needed to assemble one unit of a product is called:________.
a. a master schedule.
b. a kanban.
c. an inventory record file.
d. a bill of materials.
Answer:
(d ) . A bill of materials.
Explanation:
I hope help you !!!!!!!
12. True or False: Objects with balanced forces acting upon them may be at rest.
Answer:
True
Explanation:
I think the answer is true
Plzz help
its science
The efficiency : 95%
Further explanationEfficiency : the ratio between output and input work
In general, the value of the output of a machine is less than the value of the input because of the frictional force in the machine.
The greater the efficiency of the engine, the better the machine
Can be formulated :
[tex]\tt E=\dfrac{W_{out}}{W_{in}}\times 100\%[/tex]
w output = 190 J
W input = 200 J
The efficiency :
[tex]\tt E=\dfrac{190}{200}\times 100\%=95\%[/tex]
Consider a Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution When the cell is running spontaneously, which choice includes only true statements and no false ones?a) The iron electrode gains mass and the iron electrode is the cathode.b) The tin electrode gains mass and the tin electrode is the cathode.c) The iron electrode gains mass and the iron electrode is the anode.d) The iron electrode loses mass and the iron electrode is the cathode.e) The tin electrode loses mass and the tin electrode is the cathode.
Answer:
b) The tin electrode gains mass and the tin electrode is the cathode.
Explanation:
Iron(ii) ion, Fe⁺ is higher than tin(ii) ion, Sn²⁺ in the electrochemical series, therefore, tin (ii) iron is preferentially discharged to iron(ii) ion in aqueous solutions.
Also, since oxidation occurs at the anode and reduction occurs at the cathode, in the Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution, the Fe electrode serves as the anode, while the Sn electrode serves as the cathode.
The Sn²⁺ ions in the aqueous solution of Sn(NO₃)₂ will accept electrons from the Sn cathode and become deposited as neutral Sn atoms. At the anode, neutral Fe atoms will dissolve into the FeCl₂ solution depositing their electrons at the anode, thereby losing mass.
Therefore the correct option is: (b) The tin electrode gains mass and the tin electrode is the cathode.
Testbank, Question 143 A compound with molecular formula C8H14O4 exhibits a triplet at δ 1.3 (6H), a singlet at δ 2.6 (4H) and a quartet at δ 4.2 (4H) in its 1H NMR spectrum. Its IR spectrum shows a strong absorption band near 1740 cm-1. What is the structure for this compound
Answer: fun fact an apple onion and potatoe all taste the same if you plug your nose
Explanation:
3.How many grams of lithium nitrate will be needed to
make 250 grams of lithium sulfate? Using the following
equation:
Pb(SO ), + 4 LINO - Pb(NO3), + 2 Li SO
4
Answer:
[tex]m_{LiNO_3}=314gLiNO_3[/tex]
Explanation:
Hello!
In this case, for the given chemical reaction:
[tex]Pb(SO_4 )_2, + 4 LiNO_3 \rightarrow Pb(NO_3)_4, + 2 Li_2 SO_4[/tex]
We can see a 4:2 mole ratio between lithium nitrate (68.946 g/mol) and lithium sulfate (109.94 g/mol); in such a way, via stoichiometry, the required mass of lithium nitrate to make 250 g of lithium sulfate turns out:
[tex]m_{LiNO_3}=250gLi_2SO_4*\frac{1molLi_2SO_4}{109.94gLi_2SO_4} *\frac{4molLiNO_3}{2molLi_2SO_4} *\frac{68.946gLiNO_3}{1molLiNO_3}\\\\m_{LiNO_3}=314gLiNO_3[/tex]
Best regards!
How many moles are present in 1.2L of a 0.1 M NaCl solution?
Answer:
0.12 mole.
Explanation:
From the question given above, the following data were obtained:
Molarity of NaCl solution = 0.1 M
Volume of NaCl solution = 1.2 L
Mole of NaCl =.?
Molarity of a solution is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:
Molarity = mole /Volume
Thus, we can obtain the mole of NaCl in the solution by using the above formula as follow:
Molarity of NaCl solution = 0.1 M
Volume of NaCl solution = 1.2 L
Mole of NaCl =.?
Molarity = mole /Volume
0.1 = mole of NaCl /1.2
Cross multiply
Mole of NaCl = 0.1 × 1.2
Mole of NaCl = 0.12 mole
Therefore, 0.12 mole of NaCl is present in the solution.
What kind of energy transfers between molecules of touching substances during conduction
Answer:
heat energy
Explanation:
Conduction is the transfer of heat energy from one substance to another or within a substance.
Amplitude measures the light's
Select one:
a. frequency
b. equilibrium
c. wavelength
d. intensity
Answer:
d.) intensity
Explanation:
Which group in the Periodic Table contains elements that form ions which are larger than their atoms?
Answer:
Which group in the Periodic Table contains elements that form ions which are larger than their atoms?
The second.. . Luckily for you, I just happen to have a chart in my room.
The periodic table that contains elements that form ions which are larger than their atoms is group 2 .
Elements in group 2 of the periodic table known as alkali earth metal usually form ions that are larger than their atoms.
The elements in this group include the following;
Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra).Thus, we can conclude that the group in the periodic table that contains elements that form ions which are larger than their atoms is group 2 .
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You throw a 2-kg rock with a force of 10 N. What is the acceleration of the rock?
Answer:
5 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{10}{2} \\ [/tex]
We have the final answer as
5 m/s²Hope this helps you
What is the importance of gametes?
A. They help to produce proteins for the cell.
B. They are created when a cell splits into two copies of itself.
C. They engage in binary fission.
D. They allow eukaryotes to reproduce.
Answer:
[tex]\boxed {\boxed {\sf D. \ They \ allow \ eukaryotes \ to \ reproduce}}[/tex]
Explanation:
Gametes are also called sex cells.
There are two types: the sperm (male) and egg (female). Gametes are haploid or contain half of the genetic information. When they unite and fertilize, they combine the two halves of the genome to create a diploid zygote that has one complete set of genetic information.
This process is known as sexual reproduction, the type of reproduction that eukaryotes (organism with cells containing a nucleus with DNA and membrane bound organelles) typically use.
So, based on the information we know above, the best answer choice is D. They allow eukaryotes to reproduce
How many helium atoms does water (H20) contain?
OA) O
B) 1
C) 2
OD) 3
Answer:
it's zero
Explanation:
water is composed of hydrogen and oxygen
Which of the following is an organ in the digestive system heart, stomach, intestinal tissue, lungs
Answer:
stomach
Explanation:
stomach
Answer:
Stomach
Explanation:
The heart and lungs aren't part of the digestive system and intestinal tissue is just tissue, not the organ
A.) A student titrated a 15.00-mL sample of a solution containing a weak, monoprotic acid with NaOH. If the titration required 17.73 mL of 0.1036 M NaOH to reach the equivalence point, calculate the concentration (in M) of the weak acid in the sample.
B.) If the sample solution described in A). contained 0.1845 g of the Weak Acid, calculate the molar mass (in g/mol) of the weak acid.
Answer:
A) 0.1225 M
B) 100.4 g/mol
Explanation:
Step 1: Write the generic neutralization reaction
HA(aq) + NaOH(aq) ⇒ NaA(aq) + H₂O(l)
Step 2: Calculate the reacting moles of NaOH
17.73 mL of 0.1036 M NaOH react. The reacting moles are:
0.01773 L × 0.1036 mol/L = 1.837 × 10⁻³ mol
Step 3: Calculate the reacting moles of HA
The molar ratio of HA to NaOH is 1:1. The reacting moles of HA are 1/1 × 1.837 × 10⁻³ mol = 1.837 × 10⁻³ mol.
Step 4: Calculate the molar concentration of HA
1.837 × 10⁻³ moles of HA are in a 15.00 mL volume. The molar concentration is:
M = 1.837 × 10⁻³ mol / 0.01500 L = 0.1225 M
Step 5: Calculate the molar mass of HA
1.837 × 10⁻³ moles of HA weigh 0.1845 g. The molar mass of HA is:
0.1845 g / 1.837 × 10⁻³ mol = 100.4 g/mol
Determine the mole ratio between N2 and NF3. Question is below..
Answer:
The mole ratio is --> 1: 2
5 moles of N2
Explanation:
The balanced equation shows us that for every mole of N2, 2 moles of NH3 will be produced.
This also means that in order for 10 moles of NH3 to be produced, 5 moles of N2 need to react
Answer:
The answer is given to you by as04621.
Explanation:
Question 9 (1 point)
For the following hypothetical reaction:
3A + 2B --> 60
How many moles of C can you produce with 4 moles of A and excess B?
(Enter just the number; not the number and units)
Your Answer:
Answer
Answer:
8 moles of C
Explanation:
From the question given above, the following equation was obtained:
3A + 2B —> 6C
From the equation above,
3 moles of A reacted to produce 6 moles of C.
Thus, the number of mole of C produced by reacting 4 moles of A can be obtained as follow:
From the equation above,
3 moles of A reacted to produce 6 moles of C.
Therefore, 4 moles of C will react to produce = (4 × 6)/3 = 8 moles of C
Thus, 8 moles of C can be obtained from the reaction of 4 moles of A with excess B
Find the number of moles of water that can be formed if you have 130 mol of hydrogen gas and 60 mol of oxygen gas.
Answer:
130 moles of water might be produced by the reaction.
Explanation:
We state the equation for production of water:
2H₂(g) + O₂ (g) → 2H₂O (l)
Moles of hydrogen: 130
Moles of oxygen: 60
We state that the limting reactant is the oxygen
For 2 moles of hydrogen, we need 1 mol of oxygen
For 130 moles of hydrogen, we would need 65 moles, and we only have 60. Ratio is 2:1
1 mol of O₂ can produce 2 moles of water
Then, 60 moles of O₂ will produce (60 . 2) /1 = 130 moles
Why does a solid have a definite shape and volume?
A. The particles in a solid are not attracted to one another.
B. The particles in a solid vibrate around fixed locations.
C. The particles in a solid are not tightly packed.
D. The particles in a solid travel at a high speed of motion.
Answer:
B
Explanation:
The particles are bound to each other and they vibrate at an almost undetectable rate.
An analytical chemist weighs out 0.281g of an unknown diprotic acid into a 250mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.0700M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 48.3mL of NaOH solution. Calculate the molar mass of the unknown acid.
Answer:
166 g/mol
Explanation:
Step 1: Write the neutralization reaction
H₂A + 2 NaOH ⇒ Na₂A + 2 H₂O
Step 2: Calculate the reacting moles of NaOH
48.3 mL of 0.0700 M NaOH react.
0.0483 L × 0.0700 mol/L = 3.38 × 10⁻³ mol
Step 3: Calculate the reacting moles of H₂A
The molar ratio of H₂A to NaOH is 1:2. The reacting moles of H₂A are 1/2 × 3.38 × 10⁻³ mol = 1.69 × 10⁻³ mol.
Step 4: Calculate the molar mass of H₂A
1.69 × 10⁻³ moles of H₂A have a mass of 0.281 g. The molar mass of H₂A is:
M = 0.281 g / 1.69 × 10⁻³ mol = 166 g/mol
A Grignard reagent is prepared by reacting cyclopentanol with first thionyl chloride and then magnesium in ether. The Grignard reagent is then reacted with acetaldehyde (ethanal) and the reaction mixture acidified. What is the major final product of this series of reactions?
Answer:
Grignard reagent is a chemical compound having a halogen group along with magnesium and organic group.
Explanation:
When cyclopentanol reacts with thiogyl chloride, it gives chlorocyclopentane as the product which on further reaction with magnesium metal gives Grigmard reagent as the main product.
A Grignard reagent is a chemical compound which have the chemical formula of R−Mg−X. Here, R is an organic group, Mg is magnesium and X is halogen. The organic group may be aryl or alkyl.
The reaction and the final product is given below at the attachment.
Why was the weight of the fire snake slightly less after it was lit on fire
Answer:
Why did the fire snake weigh a little bit less than the ingredients it came from? When Zoe weighs the ingredients (sugar and baking soda), it weighs 25 grams in total. When she weighs the “snake” it weighs 23 grams. This is because some carbon dioxide gas produced during the chemical reaction escapes into the air
Brainliest
maybe
This volcano is surrounded by water. When the lava hardens, what landform will you see.
If the bark is stripped off a tree, the tree will
Answer:
may die depending on how completely it was girdled.
Explanation:
Calculate the hight of a column of liquid glycerol in meters required to exert the same pressure as 3.02 m if CCl4?
Answer:
Approximately [tex]3.81\; \rm m[/tex].
Explanation:
Look up the density [tex]\rho[/tex] of carbon tetrachloride, [tex]\rm CCl_4[/tex], and glycerol:
Density of carbon tetrachloride: approximately [tex]1.59\times 10^{3}\; \rm kg \cdot m^{-3}[/tex].Density of glycerol: approximately [tex]1.26\times 10^{3}\; \rm kg \cdot m^{-3}[/tex].Let [tex]g[/tex] denote the gravitational field strength. (Typically [tex]g \approx 9.81\; \rm N \cdot kg^{-1}[/tex] near the surface of the earth.) For a column of liquid with a height of [tex]h[/tex], if the density of the liquid is [tex]\rho[/tex], the pressure at the bottom of the column would be:
[tex]P = \rho\cdot g \cdot h[/tex].
The pressure at the bottom of this carbon tetrachloride column would be:
[tex]\begin{aligned} P &= \rho \cdot g \cdot h \\ & \approx 1.59\times 10^{3} \; \rm kg \cdot m^{-3} \times 9.81\; \rm N \cdot kg^{-1} \times 3.02 \; \rm m \approx 4.71 \times 10^{4} \; \rm N \cdot m^{-2} \end{aligned}[/tex].
Rearrange the equation [tex]P = \rho\cdot g \cdot h[/tex] for [tex]h[/tex]:
[tex]\displaystyle h = \frac{P}{\rho \cdot g}[/tex].
Apply this equation to calculate the height of the liquid glycerol column:
[tex]\begin{aligned}h &= \frac{P}{\rho \cdot g} \\ &\approx \frac{4.71 \times 10^{4}\; \rm N \cdot m^{-2}}{1.26 \times 10^{3}\; \rm kg \cdot m^{-3} \times 9.81\; \rm N \cdot kg^{-1}} \approx 3.81\; \rm m\end{aligned}[/tex].
Write a chemical equation representing the second ionization energy for lithium. Use e− as the symbol for an electron.
Answer: Li^+ (g) ----> Li^2+ (g) + e^-
Considering the definition of first and second ionization energy, the second ionization energy of lithium is:
Li⁺ → Li²⁺ + 1 e-
In first place, the electrons are attracted to the nucleus and it is necessary to provide energy to start them. Ionization energy is the energy required to remove an electron from a gaseous atom, isolated and in a ground state. The electrons in the last shell, which are the weakest attracted to the nucleus, are always lost. In this way the neutral atom becomes a gaseous cation (ion with a positive charge).
So, in this case, the first ionization energy of lithium is:
Li → Li⁺ + 1 e-
The energy required to remove a second electron is called the second ionization energy and due to the difficulty of removing an electron from a positive particle, its value is greater than the first ionization energy (the volume of a positive ion is less than that of the neutral atom and the electrostatic force is greater in the positive ion than in the atom)
Finally, in this case, the second ionization energy of lithium is:
Li⁺ → Li²⁺ + 1 e-
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