true or false all cells are the same size
Answers
Answer:
False
Explanation:
Answer:
false
Explanation:
yes
Related Questions
3. the atomic radii of mg2 and f− ions are 0.072 and 0.133 nm, respectively. ex 2.2 (a) calculate the force of attraction between these two ions at their equilibrium interionic separation (i.e., when the ions just touch one another).
Answers
The force of attraction between these two ions at their equilibrium interionic separation is F = -1.10 x 10⁻⁸.
What is the force of attraction?The force of attraction is when the atoms of two molecules attract one another.
To calculate the attraction (F), we will use Coulomb's Law:
F = k Q1Q2 / r2
where
Q₁ and Q₂ are the fees on the ions,
r is that the distance between them, and
k = the Coulomb constant
Given the Q₁ = 2+
Q₂ = 1-
r₊ = 0.072 nm
r₋ = 0.133 nm
k = 8.988 × 10⁹ N· m²C⁻²
Q₁ = (+2) × 1.602 × 10⁻¹⁹ C
= +3.204 × 10⁻¹⁹ C
Q₂ = (-1) × 1.602 × 10⁻¹⁹ C
= -1.602 × 10⁻¹⁹ C
r = r₊ + r₋
0.072 nm + 0.133 nm = 0.205 nm
= 0.205 × 10⁻⁹ m
F = -1.10 x 10⁻⁸
Thus, the force of attraction is F = -1.10 x 10⁻⁸.
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please help me figure out which has 3 significant figures
Answers
Answer:
D
Explanation:
0 is between 6 and 2 so it's also a significant figure
What is the Cp (in J/gC) of a material if a 50 gram sample of it at 100 C is placed into 500 grams of water at
20 C and the water temp rises to 23 C and the material temp goes down to 23 C?
Answers
Answer:
The specific heat capacity of this material is approximately [tex]1.6\; \rm J\cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].
(Assume that there is no energy loss. Assume that the specific heat capacity of water is [tex]4.182\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].)
Explanation:
Let [tex]c[/tex] denote the specific heat capacity of a material. Consider a sample of that material with mass [tex]m[/tex]. If the temperature of that objects changes by [tex]\Delta T[/tex], the corresponding energy change would be [tex]Q =c \cdot m \cdot \Delta T[/tex].
Start by finding the amount of energy that water has gained from the [tex]50\; \rm g[/tex] sample.
Specific heat capacity of water: [tex]c(\text{water}) \approx 4.182\; \rm J \cdot g^{-1} \cdot \left(^\circ C\right)^{-1}[/tex].Mass of water: [tex]m(\text{water}) = 500\; \rm g[/tex].Temperature change: [tex]\begin{aligned}\Delta T(\text{water}) &= T(\text{final}) - T(\text{initial}) \\ &= 23\; \rm ^\circ C - 20\; \rm ^\circ C = 3\; \rm ^\circ C\end{aligned}[/tex].That [tex]500\; \rm g[/tex] of water would have gained:
[tex]\begin{aligned} & Q(\text{water}) \\ &= c(\text{water}) \cdot m(\text{water}) \cdot \Delta T (\text{water}) \\ &\approx 4.182\; \rm J \cdot g^{-1} \cdot \left(^\circ C\right)^{-1} \times 500\; \rm g \times 3\; \rm ^\circ C \\ &\approx 6.27\times 10^{3}\; \rm J \end{aligned}[/tex].
Assume that the [tex]50\; \rm g[/tex] sample and the [tex]500\; \rm g[/tex] of water were insulated from the surroundings. The energy that water gained would be exactly the same as the energy that the [tex]50\; \rm g\![/tex] sample had released through cooling.
In other words, the [tex]50\; \rm g[/tex] sample has released approximately [tex]6.27 \times 10^{3}\; \rm J[/tex] of energy as it is cooled from [tex]100\; \rm ^\circ C[/tex] to [tex]23\; \rm ^\circ C[/tex].
Energy change: [tex]Q(\text{sample}) \approx -6.27 \times 10^{3}\; \rm J[/tex] (negative because this sample has lost energy through cooling.)Mass of sample: [tex]m = 50\; \rm g[/tex].Temperature change: [tex]\begin{aligned}\Delta T(\text{sample}) &= T(\text{final}) - T(\text{initial}) \\ &= 23\; \rm ^\circ C - 100\; \rm ^\circ C = -77\; \rm ^\circ C\end{aligned}[/tex].Rearrange the equation [tex]Q = c \cdot m \cdot \Delta T[/tex] to find an expression for specific heat capacity, [tex]c[/tex]:
[tex]\begin{aligned}c = \frac{Q}{m \cdot \Delta T}\end{aligned}[/tex].
Apply this expression to find the specific heat capacity of the sample:
[tex]\begin{aligned}c(\text{sample}) &= \frac{Q(\text{sample})}{m(\text{sample}) \cdot \Delta T(\text{sample})} \\ &\approx \frac{-6.27\times 10^{3}\; \rm J}{50\; \rm g \times \left(-77\; \rm ^\circ C\right)} \approx 1.6\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}\end{aligned}[/tex].
Solid Silicon can be reacted with Nitrogen gas at a high temperature to form silicon nitride (Si3N4).
1.20 moles of Silicon are added to 1.00 moles of Nitrogen gas.
(5 Points) Balance the equation and indicate the phases.
Si (___) + N2 (___) → Si3N4 (___)
(5 Points) What is the limiting reactant? You must show your work.
Answers
1.20 moles of Silicon are added to 1.00 moles of Nitrogen gas.
(5 Points) Balance the equation and indicate the phases.
Si (___) + N2 (___) → Si3N4 (___)
(5 Points) What is the limiting reactant? You must show your work.
What did Scientist found that surprised them after making a map of the ocean floor?
a
Subduction
b
Pangea
c
Mid-Ocean ridge
d
Volcanoes
Answers
Answer:
C
Explanation:
In 1953 they made soundings and discovered the ocean ridges
The ___ is the nations consumer protection agency to help prevent fraud , deception , and unfair business practices .
Answers
Answer:
I think it B
Explanation:
Answer:
The answer is FTC or C!!!!!!!!!!!!!!!!!!!!!!!!!!!
Explanation:
what is reduction potential?
a. a measure of ionization energy of an element
b. a measure of the electronegativity of an element
c. a measure of the ability of the substance to be reduced
d.a measure of the oxidation state of an element
Answers
Reduction potential is a measure of the ability of a substance to be reduced
What is reduction potential?Reduction potential (Eo) can simply be defined as as that tendency of a chemical species or a substance to be reduced by gaining an electron.
Generally, the reduction potential of any chemical species can be determined by subtracting the standard reduction potential for the reaction occurring at the anode from the standard reduction potential for the reaction occurring at the cathode.
So therefore, reduction potential is a measure of the ability of a substance to be reduced
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Answer: c. a measure of the ability of the substance to be reduced
Explanation:
What is the difference in actual yield and theoretical yield?
Answers
Answer: Theoretical yield Is what you expect stoichiometrically from a chemical reaction; actual yield is what you actually get from a chemical reaction
Explanation:
When a reaction happens we can have two yields
TheoreticalActualTheoretical is proved before or stochiometrically tested multiple times and stored as theory which we expect
Actual yields is that which we get actually from our reaction
A 60.0 g sample of chromium at 82.0°C (specific heat for chromium is 0.11 J/g°C) was placed in 80.0 g of water. Assume there is no loss of heat to the environment. What is the temperature of the water and the chromium? The water's initial temperature was 24.0°C.
Answers
The temperature of the water and the chromium : 25.122 ° C
Further explanationThe law of conservation of energy can be applied to heat changes, i.e. the heat received / absorbed is the same as the heat released
Q in(gained) = Q out (lost)
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Q Chromium= Q water
[tex]\tt 60\times 0.11\times (82-t)=80\times 4.18\times (t-24)\\\\541.2-6.6t=334.4t-8025.6\\\\341t=8566.8\\\\t=25.122^oC[/tex]
what two ways do nuclear power reactors harm the enviornment
Answers
Why does a pair of jeans look blue?
A. It reflects blue light.
O B. It transmits blue light.
O C. It absorbs blue light.
O D. It reflects all colors of light except blue.
Answers
Answer:
A
Explanation:
I believe the answer is A. An object is every color except the color we see, or the color that bounces off of said object. Therefore if a carpet is yellow, the carpet is every color but yellow. Yellow is the color that it rejects, bounces off of it, and the one we see.
To solve this we must be knowing each and every concept related to reflections. Therefore, a pair of jeans look blue because it reflects blue light.
What is reflection?In physics, reflection usually described as a change in the orientation of a waveform at the interface of two distinct media, bouncing the waveform back onto the original medium.
The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. A pair of jeans look blue because it reflects blue light.
Therefore, a pair of jeans look blue because it reflects blue light.
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Can someone write a speech about Chemistry. plzzzz help
Answers
Answer:
Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
n the scope of its subject, chemistry occupies an intermediate position between physics and biology.[5] It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.[6] For example, chemistry explains aspects of plant chemistry (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).
Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. Primary Chemical bonds e.g covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); Metallic bonds and 2. Secondary chemical bonds e.g. hydrogen bonds;Van der Waals force bonds, ion-ion interaction, ion-dipole interaction etc.
Explanation:
need thanks and make me brainiest if it helps you
A child on a high dive has a mass of 40 kilograms. If the high dive is 10 meters in the air, what is the potential energy?
3920 Joules
400 Joules
4 Joules
Answers
Answer:
3920 JoulesExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question we have
PE = 40 × 9.8 × 10
We have the final answer as
3920 JHope this helps you
Is potassium transparent
Answers
Answer:
some potassium can be
Explanation:
write three types of boiling
Answers
Answer: Natural Convection Boiling.
Nucleate Boiling.
Transition Boiling.
Explanation:
what causes a mountains to change in height or location
Answers
Movement of tectonic plates, erosion, earthquakes, and landslides, etc causes a mountains to change in height or location.
Some mountains might change due to the volcanic activities. Erosion occurs due to the rain and wind and primary reason for landslides to happen is flooding. When earth's crust presses against each other, the crust collects up to form the mountains. When erosion occurs, it erodes down the mountains and decreases their height making them shorter and less steep.The height and location of mountains change due to the movement of tectonic plates. When these tectonic plates shows movement, the height of mountains gradually increases and these plates produces high elevations resulting in the expansion of mountains. As much as the plates collide with each other, mountains will get taller and taller.The tectonic plates continuously moves slowly, but due to the friction, they stuck at the edge. These plates move away from each other and cause mild shocks of earthquake, or they move towards each other resulting in collision. This collision is very destructive. It brings down a mountain, resulting in gradual decrease of height of mountains.To learn more about mountains,
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5. How many moles of calcium atoms are in each mole of calcium carbonate? (1 point)
Answers
Answer:
One mole of calcium is present in one mole of calcium carbonate
Explanation:
Because its formula is CaCO3
Ca contains 2+ charge and CO3 contains 2- charge
how many electrons are in krypton
Answers
Answer: 36
Explanation:
What would happen if Jupiter gravitational pull was increased or reduced?
Answers
Before I answer your question let me quickly say something. The force of gravity is dependent on two things: the masses of the two objects in question and the distance between them.
Jupiter will not increase its gravitational pull unless it swallows a black hole or merges with Saturn.
So...with that being said, should the gravitational pull hypothetically increase, the orbits of the moons would decrease in a radius squared proportionally and increase in angular velocity.
Answer:
Jupiter would have the strongest gravitational pull on a satellite.
Gravity is directly proportional to mass.
Jupiter is the most massive, so it will have a stronger gravitational pull.
Explanation:
If a pea plant is hybrid for height, this means that
a) It has one dominant and one recessive allele
b) it has two of the same allele
PLSSSS HELP ASAP!!
Answers
Answer:
A
Explanation:
By nature, a hybrid has one dominante allele and one recessive allele
Classify the following as a solution, suspension or colloid
(a) Brine
(b) milk
(c) sand and water
(d) soda
(e) air
(f) smoke
(g) chalk and water
Answers
Answer:
Solution - (a) Brine . Suspension - (c) sand and water, (g) chalk and water Colloid - (e) air, (f) smoke , (d) soda , (b) milk
Explanation:
A solution is an homogeneous mixture of two or more compounds.
A suspension is a heterogeneous mixture of two or more compounds while a colloid is a homogeneous mixture of two or more compounds with suspended particles which do not settle.
So, under these definitions, the classifications are as follows-
Solution - (a) Brine .
Suspension - (c) sand and water, (g) chalk and water
Colloid - (e) air, (f) smoke , (d) soda , (b) milk
If the density of hydrochloric acid is 1.49 g/mL , what is the volume of 3.5 g of hydrochloric acid
Answers
The volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.
How to calculate volume?Density is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated by dividing the mass of the substance by its volume as follows:
Density = mass ÷ volume
According to this question, 3.5g of hydrochloric acid has a density of 1.49 g/mL. The volume contained in this mass of hydrochloric acid can be calculated as follows:
1.49g/mL = 3.5g ÷ V
V = 3.5 ÷ 1.49
V = 2.35mL
Therefore, the volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.
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I need help urgently see where it says text here answers the questions PLS I NEED AN 100%
Answers
Based on the properties of elements, atoms, compounds and mixtures:
Part 1:
There are four protons in the atomThere are two electrons in the atom.There are five neutrons in the atomThe atom has a negative chargePart 2: Oxygen
The atomic number is the number of protonsThe atomic mass represents the sum of the mass of the proton and neutronPart 3:
Pure element = CMixture of element & compound = DPure compound = BMixture of two compounds = AWhat are elements, atoms, compounds and mixtures?Elements are pure substances which cannot be split into simpler substances by an ordinary chemical process.
Atoms are the smallest particle of elements that can take part in a chemical reaction.
Compounds are substances composed of two or more elements chemically combined together
Mixtures are substances composed of two or more constituents physically combined together.
Considering the given questions:
How many protons are in this atom? There are four protons in the atomHow many electrons are in this atom? There are two electrons in the atom.How many neutrons are in this atom? There are five neutrons in the atomDoes this atom have a positive, negative, or neutral charge? The atom has a negative charge as it has lost two electrons.Oxygen 15.999
What does the atomic number represent? The atomic number is the number of protonsWhat does the atomic mass represent? The atomic mass represents the sum of the mass of the proton and neutronThe correct matches are:
Pure element = CMixture of element & compound = DPure compound = BMixture of two compounds = ALearn more about elements, compounds and mixtures at: https://brainly.com/question/519068
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Can someone please help me with number 10
Answers
For the reaction N2 + 3H2 - 2NH3, how many moles of nitrogen are required to produce 9.58 mol of ammonia?
Answers
Answer:
3.193 mol
Explanation:
The reaction is
[tex]N_2+3H_2\rightarrow 2NH_3[/tex]
We use the stoichiometry in order to find the moles of nitrogen required.
[tex]9.58\ \text{mol of }NH_3\times \dfrac{1\ \text{mol of }N_2}{2\ \text{mol of }NH_3}[/tex]
[tex]=3.193\ \text{mol of }N_1[/tex]
The amount of nitrogen required is 3.193 mol to produce 9.58 mol of ammonia.
what is universal indicator solution used for
Answers
I have no idea what is what
Answers
Answer:
The first one would be C. The second one would be E. The third one would be B. The fourth one would be D. Lastly, the fifth one would be A.
An aqueous solution of potassium iodide turns from colourless to brown.
What happens to the iodide ions?
A.)lodide ions are oxidised due to gain of electrons
B.)lodide ions are oxidised due to loss of electrons.
C.)lodide ions are reduced due to loss of electrons.
D.)lodide ions are reduced due to gain of electrons.
Answers
Answer:B
Explanation:
It’s pretty obvious lol
How many Barium would there be in the formula of Barium lodide
Answers
Answer: one barium atom and two iodine atoms are present in barium iodide
Explanation:
BaI2 is formula of barium iodide
How did conservatism affect the nationalist movements in Europe?
A.
It promoted the overthrow of absolute monarchies.
B.
It forced nationalist leaders to adopt socialism.
C.
It delayed or extended nationalist struggles.
D.
It emphasized the rights of individuals over nations.
Answers
Answer:
The answer is C. (It delayed or extended nationalist struggles.)
Explanation:
Hope this helps!