Answer:
Cell are too small to see without a micrscope
Explanation:
Cuz I learned in school
The following which is not one of the basic points of Cell Theory is cells are too small to see without a microscope. Hence option c is correct.
What is microscope?Microscope is defined as a lab tool for inspecting things that are too small to be seen with the eye. The study of small objects and structures under a microscope is known as microscopy. Being microscopic means being difficult to see without a microscope. A specimen that has been placed on a slide is seen, magnified, and imaged using the microscope's optical components.
Cell theory is defined as a cells are believed to be the primary building blocks of all living tissues according to a basic biological scientific hypothesis. The essential unit of structure and function in living things is the cell, according to the current Cell Theory, which is widely recognized. One or more cells make up every living thing. Cellular division creates new cells from existing ones.
Thus, the following which is not one of the basic points of Cell Theory is cells are too small to see without a microscope. Hence option c is correct.
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A 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O. Find the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g.
The mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.
How to calculate mass of an element in a compound?According to this question, a 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O.
This means that the mass of sulfur in the 10.4g of CaSO4 is 10.4g - (3.06g + 4.89g) = 10.4g - 7.95g = 2.45g
Next, we calculate the percent ratio of each element in the compound; CaSO4.
Ca = 3.06g/10.4g × 100 = 29.42%S = 2.45g/10.4g × 100 = 23.56%O = 4.89g/10.4g × 100 = 47.02%According to this question, a sample of CaSO4 with a mass of 65.8 g is given. The mass of each element in this compound is as follows:
Ca = 29.42/100 × 65.8g = 19.36gS = 23.56/100 × 65.8g = 15.50gO = 47.02/100 × 65.8g = 30.94gTherefore, the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.
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A substance has a specific gravity of 0.841. What is the mass (in dg) of 24.5 mL of this substance?
The mass (in dg) of the 24.5 mL of the substance having a specific gravity of 0.841 is 206.045 dg
We'll begin by obtaining the density of substance. This can be obtained as follow:
Specific gravity = 0.841Density of water = 1 g/mLDensity of substance =?Density of substance = Specific gravity × density of water
Density of substance = 0.841 × 1
Density of substance = 0.841 g/mL
How to determine the mass of the substanceThe mass of the substance can be obtained as illustrated below:
Density of substance = 0.841 g/mLVolume of substance = 24.5 mLMass of substance =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of substance = 0.841 × 24.5
Mass of substance = 20.6045 g
Multiply by 10 to express in dg
Mass of substance = 20.6045 × 10
Mass of substance = 206.045 dg
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A classical radio station broadcasts at 93.5 MHz. Find the wavelength of this radiation, in meters, and the energy of one of these photons, in J
a quarter made predominantly of silver (density=10.5 g/mL), was determined to have a mass of 6.25g. what is the volume of the quarter?
Taking into account the definition of density, the volume of the quarter is 0.5952 mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Volume of the quarterIn this case, you know that:
Density= 10.5 g/mLMass= 6.25 gReplacing in the definition of density:
10.5 g/mL= 6.25 g÷ volume
Solving:
10.5 g/mL× volume= 6.25 g
volume= 6.25 g÷ 10.5 g/mL
volume= 0.5952 mL
In summary, the volume of the quarter is 0.5952 mL.
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Predict the products of the following acid-base reactions and predict whether the equilibrium lies to the left or to the right. CH3COO + H3O
The products of the reaction between acetate ion and hydronium ion are acetic acid and water.The equilibrium lies to the left side of the reaction.
The equilibrium lies to the left side of the reaction as when the concentration of acetate or hydronium ion is increased the reversible reaction is favored leading to the formation of acetic acid and water.
What are the factors affecting equilibrium direction?Factors affecting equilibrium direction are as follows:
1)Change in concentration:When the concentration of any component is altered,equilibrium direction changes to minimize the effect of concentration change.
When the concentration of reactants is increased, reaction proceeds in forward direction and when concentration of products is increased, reaction proceeds in backward direction.
2)Change in temperature:Increase in temperature causes equilibrium to move in direction of endothermic reaction while decrease in temperature causes equilibrium to move in direction of exothermic reactions.
3)Change in pressure:An increase in pressure causes the reaction to reverse as the number of mole's of gas on reactant's side is decreased.
A decrease in pressure causes the reaction to move forward as the number of moles of gas on product side is reduced.
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the length of a soccer field; 120. m (three significant figures), to inches
given the following equivalences:
1 in 2.54 cm
=
1 ft = 12 in
When we convert 120 meter to feet we obtain 393.6 feet.
How do you convert from meter to feet?Unit conversions is very important in science. It is important that we are able to express a value in different units as this is able to ease the process of making calculations.
We know that;
1 meter = 3.28 foot
120 meter = 120 meter * 3.28 foot/1 meter
= 393.6 feet
Thus, when we convert 120 meter to feet we obtain 393.6 feet.
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The density of nonadecane, C₁9H40, is 0.7860 g/mL. Calculate the volume occupied by 4.605 moles of nonadecane.
volume= mL
The volume of nonadecane that has a density of 0.7860 g/mL is 1573.2mL.
How to calculate volume?The volume of a substance can be calculated by dividing the mass of the substance by its density. That is;
Volume = mass ÷ density
According to this question, nonadecane has a density of 0.7860 g/mL and has 4.605 moles.
First we calculate the mass of nonadecane as follows:
mass = 4.605 mol × 268.518 g/mol
mass = 1236.53g
Volume = 1236.53g ÷ 0.7860 g/mL = 1573.2mL
Therefore, the volume of nonadecane that has a density of 0.7860 g/mL is 1573.2mL.
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Direction: Solve the polarity of the following compounds by subtracting the electronegativity of the compounds. Determine their polarity and type of compound based on the answer.
1) CH2CI1
2) CH3OH
3) OF2
4) CCI4
5) BF3
Polarity is the distribution of electrical charge among the atoms connected by a chemical bond.
1. CH2CL- Carbon has an electronegativity of 2.5, hydrogen has a 2.2 electronegativity, and the chlorine atom has a 3.1 electronegativity. Their electronegativities differ by 0.3 for C-H and 0.6 for C-Cl. The fact that dichloromethane is a polar molecule is therefore confirmed.
2. CH3OH- The C-O bond has a difference in electronegativity of 3.44 - 2.55 = 0.89, which cannot be disregarded. The C-O bond is hence polar. The O-H bond is polar because the difference in electronegativity is 3.44 - 2.2 = 1.24.
3. OF2 - Two O-F covalent bonds can be found in OF2 O F 2. Oxygen has an electronegativity of 3.5. Fluorine has an electronegativity of 4.0. Therefore, there is a 0.5 discrepancy between the electronegativity values. Thus OF2 is polar.
4. CCl4 - Carbon tetrachloride (CCl4) is a non-polar molecule with µ=0
5. BF3 - It is more than 0.5 because the difference between the electronegativity values of B and F is equivalent to 1.94 (3.98 - 2.04 = 1.94). Therefore, each B-F bond in the molecule of boron trifluoride (BF3) is polar.
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All of the following changes to a metal are physical changes except
A: polishing
B: bending
C: melting
D: rusting
An object weighs 15.50 grams the object was placed in water the initial volume of the water was 12.5ml and the final volume was 16.0ml after the object was placed inside what is the density of the object
The density of the object weighing 15.50 g when placed inside the water having initial volume 12.5 mL and the final volume 16.0 mL is 4.42 g/mL.
Density is defined as the mass of a substance per unit of its volume. It is denoted by a Greek symbol ρ. Density is the mass of a substance divided by its volume. It is given by -
ρ = m
v
where,
ρ = density
m = mass
v = volume
Given data :
Mass (m) = 15.50 g
Volume (v) = (Final volume - initial volume)
v = 16.0 mL - 12.5 mL = 3.5 mL
Putting the values in above formula,
Density = mass
volume
Density = 15.50 = 4.42 g/mL
3.5
The density of object is found to be 4.42 g/mL
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A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 4.1 mL. If the metal weighs 4.5 g, what is the density of the metal in g / m * L ?
Taking into account the definition of density, the density of the metal is 1.097 g/mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density in this caseIn this case, you know that:
Mass= 4.5 gVolume= 4.1 mLReplacing in the definition of density:
density= 4.5 g÷ 4.1 mL
Solving:
density= 1.097 g/mL
In summary, the density of the metal is 1.097 g/mL.
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40 POINTS!!!
Listed in the Item Bank are key terms and expressions, each of which is associated
with one of the columns.
Choose the number associated with Extensive or Intensive
for each characteristic in the column. Order does not matter.
Extrinsic properties (also called extensive) are directly related to the amount of
material being measured.
Intrinsic properties (also called intensive) are those which are independent of the
amount of matter present.
Volume
Density
Mass
Temperature
Length
Melting Point
Color
Boiling Point
Luster
Answer:
ddddddfrvtrnsyjemn
Explanation:
dddddddddddd
look at the screenshot
Initially, the volume of water in a graduated cylinder is 15.35 mL. When a 12.91-gram piece of copper is dropped into this cylinder, the water level goes. Find the final water reading in the graduated cylinder if the density of copper is 8.96 g/mL.
The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL
What is the relation between density, and volume?Density is defined as mass per unit volume. Density and volume have a directly proportional relationship. That is, any change in volume causes a change in density and vice versa.
Find the final water reading in the graduated cylinder
[tex]D=\frac{M}{V}[/tex]
where,
D= density
M= mass
V= volume
volume due to copper pieces
V= M/D
V=12.91g/8.96
=1.440
find volume = original volume + displaced volume
= 15.35 + 1.440
= 16.79mL
The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL
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the NCC Libraries
What atoms listed below would form a covalent bond with each other?
-F (fluorine) and K (potassium)
-C (carbon) and Cl (chlorine)
-Ag (silver) Cu (copper)
-Ag (silver) and Br (bromine)
-Na (sodium) and Mg (magnesium)
Answer: F,C,NA
Explanation:
bc it is
Which statements are true about balancing chemical equations?
Check all that apply.
A. Balancing chemical equations does not involve trial and error.
B. Balancing chemical equations involves trial and error.
C. Atoms that are in only one of the reactants and only one of the
products should be done last.
D. Single atoms should be done last.
Answer:
statement C is the correct answer
What is the frequency of the wave shown below assuming it is light (electromagnetic radiation)?
4.17 x 107 m
The frequency of the wave assuming it is light having compete distance as 4.17×10^7 m is 1.44×10^15 Hz
Wavelength:- It is defined as the distance between the two Consecutive Crest or trough. OR distance travelled by the wave to Complete one Complete Cycle.
The distance for completing two cycle is 4.17×10^7 m
so 2λ=4.17×10^7m
λ=2.085×10^-7m
Also f=c/λ
f=3×10^8/2.085×10^-7
f=1.44×10^15 Hz
A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles is wavelength.The number of cycles or vibrations that a body in periodic motion experiences during one unit of time, as well as the number of waves that pass a given point in a unit of time is frequency.To learn more about frequency visit:
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50 points
Which elemental family receives electrons in an ionic bond?
Responses
noble gases
metals
halogens
nonmetals
Answer: es no metales
Explanation:
Question 3 of 10
What is nuclear fission?
Answer:
Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. The fission process often produces gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay
You carefully weigh out 15.00 g of CaCO3 powder and add it to 60.75 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 69.60 g . The relevant equation is
CaCO3(s)+2HCl(aq)→H2O(l)+CO2(g)+CaCl2(aq)
Assuming no other reactions take place, what mass of CO2 was produced in this reaction?
According to the law of conservation of mass, the mass of CO₂ formed is 6.15 g.
What mass of Carbon dioxide, CO₂ is produced from the given reaction between 15.00 g of CaCO3 powder and add it to 60.75 g of HCl solution?The mass of Carbon dioxide, CO₂ is produced from the given reaction between 15.00 g of CaCO3 powder and add it to 60.75 g of HCl solution is determined as follows:
The mass of the calcium carbonate, CaCO₃ reacting = 15.0 g
Mass of HCl solution reacting = 60.75 g
Total mass of reactants = 60.75 g + 15.0 g
Total mass of reactants = 75.75 g
On addition of the calcium carbonate to the HCl solution, bubbles of carbon dioxide gas, CO₂, were observed and the gas allowed to escape.
Equation of the reaction: CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)
Mass of resulting solution = 69.60 g
According to the law of conservation of mass, mass of product = mass of reactant
Therefore, mass of CO₂ formed = 75.75 g - 69.60 g
mass of CO₂ formed = 6.15 g
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Combining 0.395 mol [tex]Fe_{2} O_{3}[/tex] with excess carbon produced 11.4 g Fe.
2Fe+3CO
[tex]Fe_{2} O_{3} +3C[/tex] ⟶ [tex]2Fe + 3CO[/tex]
What is the actual yield of iron in moles?
actual yield: ________ mol
What is the theoretical yield of iron in moles?
theoretical yield: ________ mol
What is the percent yield?
percent yield: ________%
The actual yield of iron in moles is 0.2 mole and theoretical yield of iron is 0.8 mole. The percent yield of iron is 25%.
What is yield?Yield can be defined as a measure of chemical reactions efficiency, as a ratio of mole of product to the mole of reactant.
Percent yield can be calculated as actual yield divided by theoretical yield, multiply by 100.
Molar mass of Fe is 55.84 g/moles
To calculate actual yield = mass/ molar mass
= 11.4/55.84 = 0.2 moles
Theoretical yield = 0.395 x 2 = 0.8 moles
Percent yield % = actual yield/theoretical yield x 100%
= 0.2/0.8x100%
= 25%
Thus, the actual yield of iron in moles is 0.2 mole and theoretical yield of iron is 0.8 mole. The percent yield of iron is 25%.
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Li+ has larger radius than Li true or false
Answer:
true I believe
Explanation:
Does a small standard deviation mean that the results of the experiment were successful?
True or False
Answer: Ture
Explanation: A small standard deviation means that the data is more clustered around the mean (More reliable).
Which is the MOST important safety measure to follow when using an acid in a classroom laboratory?
The most important safety measure to follow when using an acid in a classroom laboratory is wearing gloves, wear face shield and protective clothing etc
On performing experiments in a lab, then it is necessary to follow the instructions of the teacher and safety measures thoroughly so that any accident will not lead to any a major injury kind. Wearing gloves, goggles, and other safety gear is the minimum requirement for doing an experiment while the teacher is not present. protective clothing.To guarantee appropriate protection from concentrated acid spills, you must wear a face shield over your safety glasses, nitrile gloves (if available), and neoprene aprons.To learn more about face shield visit:
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What is the numerical value of 1.2 × 1.222? Express your answer using the correct number of significant figures.
Using simple multiplication, we can conclude that 1.5 is the numerical value of 1.2 × 1.222.
What is numerical ?When solving mathematical analysis issues, numerical analysis is the study of methods that employ numerical approximation rather than symbolic manipulation (as distinguished from discrete mathematics). The study of numerical techniques aims to identify approximate rather than precise answers to issues.
Numerous engineering and physical science disciplines, as well as the life and social sciences, as well as commerce, the arts, and even medicine, use numerical analysis.
The use of more complex numerical analysis is now possible thanks to the rise in computing power, which also enables the creation of intricate and accurate mathematical models for use in engineering and science. Ordinary differential equations, which are used in celestial mechanics to forecast the motion of planets, stars, and galaxies, are examples of numerical analysis.
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How many atoms are in 1.50 moles of lithium, Li?
Answer:
1 LITHIUM= 6.022140857×1023 atoms
0.50 LITHIUM = 3.01 × 102^3
ADD THEM TOGETHER AND YOU GET YOUR ANSWER.
Explanation:
Drag each tile to the correct box. Based on your observations in this task, rank the three types of substances according to the strength of the forces between particles, from weakest to strongest. Tiles polar substancesnonpolar substancesionic substances Sequence <
Intermolecular force is the force of attraction that holds the particles in the atom together. The force referred to in the question is the force that binds the various elements together when they come together.
The intermolecular forces presented in the answer options in order of strength to weakness are ion-dipole hydrogen bonds dipole-dipole and van der Waals forces. The dipole-dipole interaction is the strongest intermolecular attraction. These are the weakest intermolecular forces and exist between all types of molecules, whether ionic or covalent, polar or non-polar.
Solids usually have the strongest intermolecular forces compared to liquids and gases. In solids, they are incompressible and dense because the particles are close together. The weakest intermolecular force is the London dispersion force. London Dispersion Force The London dispersion force is also known as the induced dipole induced dipole because it is a temporary attractive force that generates a temporary dipole. London dispersion exists in nonpolar monatomic gases.
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Answer:
nonpolar substance < polar substance < ionic substance
Explanation:
Answer key
Rounding off 0.072251 to four significant figures
0.072251
Explanation:
The Sig Figs would be 5 (0.072251)
In Decimals 6 (0.072251)
Scientific Notation 7.2251 × 10-2
E-Notation 7.2251e-2
Question Completion Status:
PUESTIVITY
Refer to Activity 2 in Lab 3A to answer the question below
Two amino acids are shown below in the process of forming a peptide bond (labeled). The hydroxyl (-OH circled in red) is being removed from the carboxyl group of the first amino acid. A hydrogen
atom (-H circled in red) is being removed from the amine group from the second amino acid. The removed -OH and -H will form water (H20)
Question
What chemical reaction takes place when water is removed to form a bond (as is being shown below)?
Explanation:
Refer to Activity 2 in Lab 3A to answer the question below
Two amino acids are shown below in the process of forming a peptide bond (labeled). The hydroxyl (-OH circled in red) is being removed from the carboxyl group of the first amino acid. A hydrogen
atom (-H circled in red) is being removed from the amine group from the second amino acid. The removed -OH and -H will form water (H20)
Question
What chemical reaction takes place when water is removed to form a bond (as is being shown below)?
2.4.5 x 10³ dm³ to m³
Answer:
The conversion factor is 0.001; so 1 cubic decimeter = 0.001 cubic meters. In other words, the value in dm3 divide by 1000 to get a value in m3.
Explanation:
How many atoms are in 100.0 grams of neon, Ne?
Answer: 20.179 grams
I had to do a project on this recently, so here is your answer!
Hope this is helpful!
Answer:
2.894 x 10²⁴ atoms Ne
Explanation:
To find the amount of neon atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator of the ratios in this case). The final answer should have 4 sig figs like the given value (100.0 = 4 sig figs).
Atomic Mass (Ne): 20.180 g/mol
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
100.0 g Ne 1 mole 6.022 x 10²³ atoms
-------------------- x ----------------- x ------------------------------- = 2.894 x 10²⁴ atoms
20.180 g 1 mole