Answer:
The correct answer is -
1. 1 grain of sand = 244 red blood cells.
2. 1 penny = 2439
Explanation:
A normal red blood cell has a normal disk diameter of 6.2 - 8.2 micron or micrometer is way small than a grain of sand which ranges in diameter from 0.0625 mm (or 1⁄16 mm) to 2 mm. The size of the diameter of a penny is given 0.02 m.
Let take the highest value of them:
RBC = 8.2 micrometer
The grain of sand = 2 mm
Penny = 0.02 m
we know:
1 meter = 10e+6 or 100000 micron
1 millimeter = 1000 micron
then, the grain of sand = 2* 1000 = 2000
so, the 1 grain sand = 2000/8.2
= 244
Similarly,
Penny = 0.02*100000= 20000
= 2439
Thus, the correct answer is =
1. 1 grain of sand = 244 red blood cells.
2. 1 penny = 2439
2. Why do ions form?
Answer:
When atoms lose or gain electrons, they become positively or negatively charged ions. In an ionic compound, the ions are arranged in a three-dimensional structure called a crystal. ... When an atoms gains or loses electrons, it gains a charge, thus becoming an ion.
Explanation:
Answer:
The iron ore deposits began forming when the first organisms capable of photosynthesis began releasing oxygen into the waters.
Explanation:
(HELP FAST )The model shows a molecule of silk made by a spider.
What is the wavelength of a wave with energy equal to 1.528 x 10-13 J? E=hc/LaTeX: \lambdaλ Energy= Measured in Joules h=Plank's constant, 6.626 x 10-34 J x s c=speed of light, 3.00 x108 m/s LaTeX: \lambdaλ= wavelength in meters Group of answer choices 1.301 x 1029 m 6.918 x 1028m 6.918 x 10-13m 1.301 x 10-12m
Answer:
1.301 × 10⁻¹² m
Explanation:
Step 1: Given and required data
Energy of the electromagnetic wave (E): 1.528 × 10⁻¹³ JPlanck's constant (h): 6.626 × 10⁻³⁴ J . sSpeed of light (c): 3.00 × 10⁸ m/sStep 2: Calculate the wavelength (λ) of the electromagnetic wave
We can calculate the wavelength of the electromagnetic wave using the Planck-Einstein's relation.
E = h × c / λ
λ = h × c / E
λ = (6.626 × 10⁻³⁴ J . s) × (3.00 × 10⁸ m/s) / 1.528 × 10⁻¹³ J
λ = 1.301 × 10⁻¹² m
The wavelength of this wave is equal to: D. [tex]1.301 \times 10^{-12}\;meter[/tex]
Given the following data:
Energy = [tex]1.528 \times 10^{-13} \;Joules[/tex]Plank's constant = [tex]6.626 \times 10^{-34}\;Js[/tex]Speed of light = [tex]3 \times 10^8\;m/s[/tex]To determine the wavelength of this wave, we would apply Einstein's equation for photon energy:
Mathematically, Einstein's equation for photon energy is given by the formula:
[tex]E=\frac{hc}{\lambda}[/tex]
Where:
E is the energy. h is Plank's constant.[tex]\lambda[/tex] is the wavelength.c is the speed of light.Making [tex]\lambda[/tex] the subject of formula, we have:
[tex]\lambda = \frac{hc}{E}[/tex]
Substituting the given parameters into the formula, we have;
[tex]\lambda = \frac{6.626 \times 10^{-34}\; \times \;3.0 \times 10^{8}}{1.528 \times 10^{-13} }\\\\\lambda = \frac{1.99 \times 10^{-25}}{1.528 \times 10^{-13} }\\\\\lambda =1.301 \times 10^{-12}\;meter[/tex]
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differentiate between stream load stream discharge and stream gradient
Answer:
Differentiated below
Explanation:
- Stream load is defined as the quantity of solid matter that's carried by the erosion of the stream.
- Stream discharge is defined as the quantity (which is volume) of water that passes a given point for a particular amount of time.
- Stream Gradient is defined as the slope of the stream. This is basically expressed as:
Stream gradient = Change in elevation between two points on a stream ÷ actual distance between the two points where water actually flows.
what is observed when an iron bar is dipped into a solution of silver nitrate
Answer:
I think it will start to have a greenish color and get lighter
Explanation:
4) 300cm of Hydrogen chloride gas were passed over 7.0g of heated iron fillings until there was no further
change. The reaction vessel was then allowed to cool to room temperature. Use the equation below to
determine the mass of iron that remained at the end of the experiment (molar gas volume = 24000cm"; Fe=56).
Fe(s) + 2HCl(g) → FeCl2(s) + H2(g)
(3 mks)
50
3 of IM colution calcium chloride (Avogadro's
The mass of iron that remained at the end of the experiment : 6.65 g
Further explanationGiven
V HCl gas = 300 cm³
mass Fe = 7 g(Ar Fe = 56 g/mol)
Reaction
Fe(s) + 2HCl(g) → FeCl2(s) + H2(g)
Required
The mass of iron remained
Solution
molar volume for 1 mol gas = 24000 cm³=24 L, so mol HCl :
[tex]\tt \dfrac{300}{24000}=0.0125~mole[/tex]
mol ratio Fe : HCl from equation : 1 : 2, so mol Fe =
[tex]\tt \dfrac{1}{2}\times 0.0125=0.00625[/tex]
mass of Iron(reacted) :
[tex]\tt 0.00625\times 56=0.35~g[/tex]
Mass remained
7 g - 0.35 = 6.65 g
Calculate the number of moles in 125g of Copper (II) Hydroxide. URGENT!
Answer:
1.28 mol Cu(OH)₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
125 g Cu(OH)₂
Step 2: Identify Conversions
Molar Mass of Cu - 63.55 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of Cu(OH)₂ - 63.55 + 2(16.00) + 2(1.01) = 97.57 g/mol
Step 3: Convert
[tex]125 \ g \ Cu(OH)_2(\frac{1 \ mol \ Cu(OH)_2}{97.57 \ g \ Cu(OH)_2} )[/tex] = 1.28113 mol Cu(OH)₂
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.28113 mol Cu(OH)₂ ≈ 1.28 mol Cu(OH)₂
What is the molecular formula of a compound that is composed of 94.1% O and 5.9% H with a molar mass of 34g
Answer:
H2O2
Explanation:
I know it's been awhile since the question was asked but for future people like me its H2O2 I got it right in the quiz.
The whole-number multiple is obtained by dividing its molar mass (34.02 g/mol) by the empirical formula mass. H₂O₂ is the molecular formula of a compound that is composed of 94.1% O and 5.9% H with a molar mass of 34g.
What is molar mass ?The mass of a sample of a chemical compound divided by the quantity, or number of moles in the sample, measured in moles, is known as the molar mass of that compound. The molar mass of a material is a bulk attribute rather than a molecular one.
The mass of 6.022 × 10²³ atoms, molecules, or formula units of a material are equal to its molar mass, which is the mass of 1 mole of that substance represented in grams per mole.
Molar mass is a crucial factor to consider while planning an experiment. The molar mass enables you to calculate the quantity you should weigh out on your scale when testing theories that call for specified amounts of a material.
Thus, H₂O₂ is the molecular formula of a compound that is composed of 94.1% O and 5.9% H with a molar mass of 34g.
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OxYgen and hydrogen particles are kept in a container. Which of the following
accurately describes diffüsion of these gases?
OOxygen and hydrogen particles concentrate at the center of the container.
Oxygen particles move to one corner of the container and hydrogen particles go
to the opposite corner
DOxygen particles and hydrogen particles repel each other.
O Oxygen particles mix evenly with hydrogen particles.
Answer:
Option D
Oxygen particles mix evenly with hydrogen particles.
Explanation:
Diffusion refers to the movement of gasses from a region of higher concentration to a region of lower concentration.
Diffusion occurs in gases because their particles are in a state of constant random motion.
Due to this continuous random motion, once the oxygen and the hydrogen are added to the container, they will begin to mix freely with each other until they fill up the entire volume of the container.
What do elements in a group on the periodic table have in common?
Answer:
They have similar chemical properties.
Explanation:
james madison test
The elements in a group on the periodic table have in common that they all are arranged on the basis of the number of electrons in the outer most shell of the atom.
What is periodic table?The periodic table of elements is defined as in which the classified all the non metals accordance with their properties in such a way that with similar properties are grouped.
Moosley arranged the elements in increasing order of their atomic number and observed that after a certain time of interval elements with same properties are repeated.
Therefore, elements in a group on the periodic table have in common that they all are arranged on the basis of the number of electrons in the outer most shell of the atom.
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⚠️PLS HELP I HAVE ZERO CLUE AND NEED HELP ASAP DUE AT 12 WILL GOVE BRAINLIEST THANK U⚠️
1/4th of a sample of thorium-232 remains.
How long has the sample been decaying?
Answer:
I believe it is 42.3 billion years old
Explanation:
Question 5 please thanks! Due in 4 Minutes xoxo!.
the answer would be B
the particles wouldnt break, nor would the form new particles or just disappear
Draw the structure of 2-bromo, 3-chloro-4,4-dimethyl
Answer:
The compound you are asking for is not complete. But I will give you the answer to one of the compounds.
The complete compound is:
2-bromo, 3-chloro-4,4-dimethylpentane.
Attached is the structure of the compound.
Explanation:
2-bromo, 3-chloro-4,4-dimethylpentane is an organic compound. It's molecular formula is C₇H₁₄BrCl.
This compound has bromine and chlorine attached to the backbone carbon of the pentane compound. The bromine and chlorine are attached to the second and third backbone carbon of the compound respectively.
Also, the dimethyl means that the compound has two methyl (CH₃) attached to the same carbon which is the number 4 backbone carbon.
A circuit is a path along which electric current flows. How would changing the battery in a circuit from 9 volts to 1.5 volts most likely affect the circuit? More electric charge would flow in the circuit. Less electric charge would flow in the circuit. The resistance in the circuit would decrease. The resistance in the circuit would increase.
Answer:
A wave passes from a solid to a liquid while remaining the same temperature.
The medium increases in temperature while remaining in the same phase.
The medium decreases in temperature while remaining in the same phase.
A wave passes from a liquid to a gas while remaining the same temperature.
AND less electric charge would flow in the circuit
The voltage is decreased
Explanation:
PLEZZ MARK ME AS BRAINLYEST PLEZZ!!
Changing the battery in a circuit from 9 volts to 1.5 volts would most likely result in less electric charge flowing in the circuit.
What is Ohm's law ?According ohms law, the electric voltage is the product of current and resistance in the circuit. A lower voltage battery will have less electric potential energy available to move the charges, resulting in a lower electric current flow in the circuit.
The resistance in the circuit would not necessarily increase or decrease due to the change in the battery voltage. Resistance is a property of the components in the circuit, such as resistors, wires, and other devices that can impede the flow of current.
However, if the resistance of the circuit remains the same and the battery voltage decreases, the resulting electric current flow would also decrease according to Ohm's law (I = V/R), where I is the current, V is the voltage, and R is the resistance.
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when will condensation occur?
A. When the humidity equals the relative humidity
B. When sublimation does not occur
C. When the relative humidity drops below 50 percent
D. When the temperature drops below the dew point
Answer:
d
Explanation:
PLEASE HELP ASAP I NEED HELP I LOVE YOU THIS IS URGENT PLEASE MY CLASS ENDS IN LIKE A DAY AND A HAVE 3 UNITS LEFT
Answer:
B: Hemoglobin
Explanation:
that's the answer
Answer:
B.Hemoglobin
Explanation:
Hemoglobin is the red color pigment that gives the color to your blood. Its found in the RBC's [Red Blood Cells]. Its main function is to bind completely with oxygen, due to the presence of iron in it, that helps it to get transported to various parts of the body according to its necessity through blood.
plzz help this is timed! true or false/Continental air masses are cold. Maritime air masses are hot.
Answer:
False.
Explanation:
Na2SO3 + S -------> Na2S2O3
Answer:
Synthesis
Explanation:
A+B=C
3 A student investigates how the concentration of an acid affects the speed of reaction with a 0.5
D filtration
mass of magnesium at 30°C.
The student has a beaker, concentrated acid, water and the apparatus below.
P a balance
Qa dock
R a measuring cylinder
S a thermometer
Which pieces of apparatus does the student use?
A P, Q and R only
B P, Q and S only
C Q, R and S only
DP, Q, R and S
Answer:
C Q, R and S only.
Thermometer: for measuring temperature.
Measuring cylinder: for measuring accurate volume used in standardization during determination of concentration.
dock: for holding solutions
What happens when the number of electrons and protons inside of an atom are Not equel?
Hello, It's me Moriah Elizabeth!
Answer:
When the number of electrons does not equal the number of protons, the atom is ionized.
In the diagram of a transverse wave shown, what does M represent?
Transverse Wave
P=1cycle per second
A. Wavelength
B. Frequency
C. Amplitude
D. Rest positions
In the diagram of a transverse wave, P = 1 cycle per second, M represent wavelength. Therefore, option A is correct.
What is transverse wave ?A wave is considered to be transverse if its oscillations run counterclockwise to the wave's direction of advance. A longitudinal wave, on the other hand, moves in the direction of its oscillations. Transverse waves include water waves.
Due to the shear stress produced, transverse waves are frequently observed in elastic solids; in this situation, the oscillations are caused by the displacement of the solid particles from their relaxed state in directions perpendicular to the wave's propagation.
Trough: A transverse wave's lowest point. The distance separating one transverse wave's peak from the next is known as the wavelength. The distance from the wave's resting position to its crest is its amplitude.
Thus, option A is correct.
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In the lab you react 23 g of potassium iodide with an excess of lead (II) nitrate to form 18 g of lead (II) iodide precipitate. What is the percent yield of your experiment?
A) 28
B) 56
C) 84
D) 98
Answer:
B) Percent yield = 56%
Explanation:
Given data:
Mass of potassium iodide = 23 g
Mass of lead iodide formed = 18 g
Percent yield = ?
Solution:
Chemical equation:
2KI + Pb(NO₃)₂ → 2KNO₃ + PbI₂
Number of moles of potassium iodide:
Number of moles = mass / molar mass
Number of moles = 23 g/ 166 g/mol
Number of moles = 0.14 mol
Now we will compare the moles of PbI₂ and KI:
KI : PbI₂
2 : 1
0.14 : 1/2×0.14 = 0.07
Theoretical yield of PbI₂:
Mass = number of moles × molar mass
Mass = 0.07 × 461 g/mol
Mass = 32.27 g
Percent yield:
Percent yield = actual yield / theoretical yield × 100
Percent yield = 18 g/ 32.27 g × 100
Percent yield = 56%
J.J. Thompson in 1987, announced that cathode rays consisted of a stream
of ?
Hydrogen
Nuclei
Isotopes
Electrons
Indicate which one of the two species is larger
A. Mg2+ or Ca2+
Answer:
Ca2+ is larger than Mg2+
Explanation:
Mg2+ has total 10 electrons and Ca2+ has total 18 electrons. So, Ca2+ will have more no of subshell which means greater particle size.
When iso-propanol burns in oxygen, carbon dioxide and water are produced
Explanation:
When liquid isopropanol (C3H8O) burns in oxygen gas, carbon dioxide gas and liquid water are produced. When dissolved sodium hydroxide reacts with sulfuric acid, aqueous sodium sulfate and water are formed.
Can someone answer these two separate questions pls ill give brainliest
The average speed
3. 89.7 m/min
4. 6.13 ft/min
Further explanationGiven
3. 1076 m in 12 min
4. 92 ft in 15 min
Required
average speed
Solution
3.
I am solving for : the average speed
The equation I need is :
[tex]\tt avg~speed=\dfrac{total~distance}{total~time}[/tex]
This is how I set the equation
[tex]\tt avg~speed=\dfrac{1076~m}{12~min}[/tex]
This is my answer = 89.7 m/min
4.
I am solving for : the average speed
The equation I need is :
[tex]\tt avg~speed=\dfrac{total~distance}{total~time}[/tex]
This is how I set the equation
[tex]\tt avg~speed=\dfrac{92~ft}{15~min}[/tex]
This is my answer = 6.13 ft/min
If you put an egg on a plate will it melt ?? Im confused
How many seconds are in 209.7 ms?
Answer:0.21 seconds
Explanation:
Just because it is and how science works
Answer:
0.21 seconds, please let me know if I am wrong
F
19.00
Fluorine
Using the information on the figure above, report the atomic number and atomic mass of fluorine.
Answer:
From the periodic table, Atomic number of fluorine is 7 and atomic mass is 19
How is light energy converted to chemical energy?
Answer:
Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.
Explanation:
Answer:
Photosynthesis is the process in which light energy
Explanation: