Answer:
D. number of protons
Explanation:
Sana makatulong
What is the oxidation state of P in PO43-?
O A. +8
O B. +3
O C. +5
OD. +2
Answer:
the answer is +5
Explanation:
good luck :)
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
What is the main difference between vascular and nonvascular plants? the ability or inability to perform photosynthesis the presence or absence of xylem and phloem the ability or inability to perform cellular respiration the presence or absence of water
Answer:
Vascular plants are plants found on land that have lignified tissues for conducting water and minerals throughout the body of the plant. Non-vascular plants are plants mostly found in damp and moist areas and lack specialized vascular tissues. Vascular plants are also known as tracheophytes.
Explanation:
Answer:
The correct answer is B. The presence or absence of xylem and phloem.
Explanation:
I did this quiz. :)
PLZZZ HURRY
Stuart designed and built a water filter in class. He wants to know if it will make water from lakes or streams safe to drink. Which of
the following would it be best for Stuart to measure in an experiment in order to test his design and answer this question?
А. the amount of time required for different volumes of water to pass through his filter
В. the diameter of the largest grain of dust, dirt, or sand that can pass through his filter
C. the amount of bacteria and impurities in water both before and after it passes through his filter
D. the maximum force that can be applied to his filter without breaking it
Answer:
c or d
Explanation:
C! The amount of bacteria and impurities in water both before and after it passes through his filter!
Explanation:
Although each of these properties of Stuart's filter may be worth testing, the one that will tell him whether his filter can make lake water safe to drink is the amount of bacteria, parasites, and impurities in water both before and after it passes through his filter. Some filters are good at removing impurities, but not bacteria. Other ways of purifying water may kill bacteria but not remove impurities.
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
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
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.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].
If the bark is stripped off a tree, the tree will
Answer:
may die depending on how completely it was girdled.
Explanation:
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.
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.
12. True or False: Objects with balanced forces acting upon them may be at rest.
Answer:
True
Explanation:
I think the answer is true
__________ are composed of two or more covalently bonded atoms.
a). elements
b)molecules
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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The IR spectrum of a solid can be taken by dissolving it to create a solution. An appropriate solvent is ________because its IR stretches are _______
Answer:
An appropriate solvent is carbon tetrachloride [tex](CCl_{4} )[/tex] because its IR stretches are not visible in the infrared region.
Explanation:
Non-polar solvents don not show peaks at the IR frequency region because they do not have dipoles which would absorb the infrared light. This makes them suitable solvents in IR Spectroscopy.
Therefore non-polar solvents such as CCl4 or Carbon disulfide are appropriate for the IR spectrum. They also do not interfere with the halide disks used in the spectrometer, as a solvent like water would.
Let me know if you need any other assistance.
What type of energy drives the turbines that produce electricity from water?
Answer:
Wind energy
Explanation:
Answer: Wind energy
Explanation:
Perform the following operation
and express the answer in
scientific notation.
5.0x10-5 +2.0x10-4
Answer:
[tex]2.5[/tex] × [tex]10^{-4}[/tex]
Explanation:
[tex]5+10^{-5} + 2[/tex] × [tex]10^{-4} = 0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex]
[tex]0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex] = [tex]2.5[/tex] × [tex]10^{-4}[/tex]
In the provided issue, the scientific notation-expressed integers 5.0x10-5 and 2.0x10-4 are added, and the solution is 2.5x10^-4.
Thus, first transform the smaller integer to have the same exponent as the larger number in order to complete the addition. In this situation, by shifting the decimal point one position to the right, we rewrite 5.0x10-5 as 0.5x10-4.
The outcome of adding the numbers together is 2.5. Finally, we use the common exponent—in this example, -4—to express the result in scientific notation. The final solution is 2.5x10^-4 as a result. Therefore, by adjusting the exponent and adding the numbers, the final solution, 2.5x10^-4 is obtained.
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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
Is tissue a element or compound
Answer:
compound
Explanation:
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 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 !!!!!!!
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:
c. When 4.46 moles of ethylene, C2H4, burns in oxygen to give carbon dioxide and
water, how many grams of carbon dioxide are formed?
C₂H4 + 30₂
-
2 H2O + 2 CO2
Answer:
finding believability
Amplitude measures the light's
Select one:
a. frequency
b. equilibrium
c. wavelength
d. intensity
Answer:
d.) intensity
Explanation:
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.
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.
The elaboration likelihood model emphasizes the use of __________ persuasion and __________ persuasion methods. A. direct . . . elaborative B. peripheral . . . elaborative C. direct . . . peripheral D. indirect . . . direct Please select the best answer from the choices provided A B C D
Answer:
It's C, direct and peripheral.
Explanation:
Just took the test
The elaboration likelihood model emphasizes the use of direct persuasion
and peripheral persuasion methods.
This theory involves a dual process which explains how attitudes are
changed in individuals through persuasion. The two methods of persuasion
include:
Direct persuasionPeripheral persuasionThese methods help in the formation of attitude which makes option C the
most appropriate choice.
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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
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:
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In what order do electrons fill orbitals?
A. Before pairing, 1 electron occupies each s and p orbital.
B. Electrons fill orbitals in order of increasing orbital energy.
C. Orbitals s, p, and then d fill in one energy level before starting the
next level.
D. The p orbitals fill before the s orbitals in an energy level.
SUBM
Answer:B electrons fill orbitals In order of their increasing energy from left to right
Explanation: