Answer:
a
Explanation:
contains subatomic particles named the proton,neutron and electron
An atom is the smallest particle of a substance that can take part in a chemical reaction. It is composed of subatomic particles.
The statements that best describe an atom are;
contains subatomic particles named the proton, neutron, and electronhas no net charge and has a cloud surrounding a dense inner coreis the smallest particle of an element that retains its identity in a chemical reactionAtoms of elements are the smallest particle of the element. According to the law of conservation of mass, atoms of elements retain their identity in a chemical reaction.
An atom is composed of a massive inner core having neutrons and protons and then a cloud of charge hovering over this dense inner core.
The atom has no net charge because the number of protons and electrons are exactly equal.
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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).
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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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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Write each of the following numbers to 3 significant figures in non-exponential notation
(Do not include a decimal point for numbers greater than 1.)
5.95 x 10^-3
7.33 x 10^4
4.09 x 10^3
9.15 x 10^-5
5.95 x 10^-3 = 0.006
7.33 x 10^4 = 73,300
4.09 x 10^3 = 4090
9.15 x 10^-5 = 0.000
Calculation of significant figuresTo calculate the significant figure for a given mathematical expression means to represent the end value to specific number of digits that are accurate.
The given figures are in scientific or exponential notation but to convert them to 3 significant figures the following steps are taken:
If it's a number that is less than one, there must be three digits before decimal point as seen in 0.006.If it's a number greater than one, it must contain three significant digits such as 73300.Therefore three significant figures of the expressions given include the following:
5.95 x 10^-3 = 0.006
7.33 x 10^4 = 73,300
4.09 x 10^3 = 4090
9.15 x 10^-5 = 0.000
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Which phrase best describes electronegativity?
The phrase which best describes electronegativity is the relative strength with which an element attracts electrons in a chemical bond and is denoted as option A.
What is Electronegativity?This is referred to as the chemical property which is possessed by an element that involves its tendency to attract electrons especially during chemical bond formation.
Electronegativity increases from bottom to top in groups, and increases from left to right across periods in the periodic table and are influenced by factors such as number of valence electrons etc.
This is usually done so that they can achieve a stable octet configuration which results in the bonds being formed and the new substance being produced thereby making it important in a chemical reaction.
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The options are:
the relative strength with which an element attracts electrons in a chemical bond.the partial charge an element carries in a covalent or ionic bond.the number of electrons an element has.the number of electrons an element shares in an ionic bond.Phosphorus combined with hydrogen to form phosphine. Compare, in terms of matter, phosphorus and phosphine.
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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50 points
Which elemental family receives electrons in an ionic bond?
Responses
noble gases
metals
halogens
nonmetals
Answer: es no metales
Explanation:
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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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
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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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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29) The existence of electrons in atoms of all elements was demonstrated by
A) Millikan's oil drop experiment.
B) Rutherford's gold foil experiment.
C) Thomson's cathode ray tube experiment.
D) None of the above.
Answer:
c Thomson's cathode ray tube experiment
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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whats defination isomer
Answer:
Isomer
1.
CHEMISTRY DEFINITION
each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
2.
PHYSICS DEFINITION
each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states.
Explanation:
Brainliest pls thank you have a good day bye bye
Answer:
each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
Explanation:
What is the rule for translating the point 3 units to the right?
1. (x,y+3)
2. (x+3,y)
3. (x,y−3)
4. (x−3,y)
Answer:
Second option
Explanation:
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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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
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
Which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction?
1. Suppose 10 atoms of carbon (C) tear with 20 atoms of (O)….
B. 30
2. Which procedure could be used to demonstrate that matter is conserved during a chemical reaction?
B. Find the mass of an acid and a base. Combine them to produce water and salt. Find the mass of the water and salt.
3. What is always true according to the law of conservation of matter?
A. Atoms can be rearranged during a chemical reaction but cannot be added or taken away.
4. A student combines 2 liquids in a beaker…
B. The reaction produced a Gas that escaped the beaker
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
How do you dispose material that decay?
Answer:
compost at home it can reduce the amount of food you throw in the trash
Explanation:
can make a greater envoirment and is very eco friendly
when is science meaningful?
Li+ has larger radius than Li true or false
Answer:
true I believe
Explanation:
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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What is the importance of Steriochemistry in the field of medicine?
Answer:
Stereochemistry is of critical importance to drug action because the shape of a drug molecule is an important factor in determining how it interacts with the various biological molecules (enzymes, receptors, etc.) that it encounters in the body.
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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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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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: