Answer:
c Thomson's cathode ray tube experiment
In Chemistry we look at the composition and the_____of matter
I need help with this question
Answer:
I think It's the 2nd "There are two compounds present"
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.
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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What is the percent by mass of Ca in CaCl2?
The percent by mass of Ca in CaCl2 is 36 percent
mass of Ca = 40 gram
mass of CaCl2 = 35.5 x 2 = 111 gram
percent by mass of element = molar mass of element/mass of compound x 100
percent mass of Ca = 40/111 = 36 percent
What is mean by percent by mass ?The concentration of an element in a compound or component in a mixture can be expressed, for example, as a mass percentage. The mass of a component is divided by the entire mass of the combination, then multiplied by 100%, to compute the mass percentage. Other Names: mass percent, (w/w)%
With the aid of this formula, one can determine the lowest entire number of moles and the proportional number of atoms of each element present in a compound. The true molecular formula can be calculated by chemists using the empirical formula. The number of atoms in the compound are specified in this formula.Learn more about Percent by mass here:
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Phosphorus combined with hydrogen to form phosphine. Compare, in terms of matter, phosphorus and phosphine.
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 2.64 L aqueous solution of KOH. The solution has a density of 1.29 g/mL.
Calculate the molarity, Molality, and mass percent concentration of the solution.
The molarity of the solution is 0.023 M and the molality of the solution is 17.9 m.
What is the molality?The concentration of a solution is defined as the amount of substance in a solution. Now we are told that we have a solution of 2.64 L aqueous solution of KOH. The solution has a density of 1.29 g/mL.
Density of the solution = 1.29 g/mL
Volume of the solution = 2.64 L
mass of the solution = 1.29 g/mL * 2.64 L = 3.4 g
Number of moles of the solute = 3.4 g/56 g/mol = 0.061 moles
Molarity = 0.061 moles/2.64 L = 0.023 M
Molality of the solution = 0.061 moles/3.4 * 10^-3 Kg = 17.9 m
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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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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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The Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60×10^−26 . Calculate the solubility of this compound in grams per liter.
The solubility of the compound is obtained as 9.5 * 10^-14 M.
What is the solubility product?The solubility product refers to the equilibrium constant that shows the extent to which a thing is soluble in water, Now we can write the solubility product as;
Ksp = [Hg^2+] [2OH^-]^2
Let [Hg^2+] = [OH^-] = x
Then I can write;
Ksp = x * (2x)^2
Ksp = 4x^3
When x = solubility
x = ∛Ksp/4
Ksp = 3.60×10^−26
x = ∛ 3.60×10^−26/4
x = 9.5 * 10^-14 M
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A new linear temperature scale, degrees Zunzol ( ∘Z ), is based on the freezing point and boiling point of a newly discovered compound zunzol. The freezing point of zunzol, −117.3 ∘C, is defined as 0 ∘Z, and the boiling point of zunzol, 78.4 ∘C, is defined as 100 ∘Z. What is the freezing point of water in degrees Zunzol?
The boiling point of water in Zunzol is 59.9∘Z.
What are fixed points?A thermometer must have two fixed points, the upper fixed points and the lower fixed point. The upper fixed point corresponds to the boiling point while the lower fixed point corresponds to the melting point.
Having that;
x - 0/100 = 0 - (-117.3)/78.4 - (-117.3)
x/100 = 117.3/195.7
195.7x = 117.3 * 100
x = 117.3 * 100/195.7
x = 59.9∘Z
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Identify the nuclide produced when carbon-14 decays by beta emission: 14 6C→ 0−1e + ?
This nuclear reaction would give Boron - 14 as the product.
What is beta emission?A beta emission has to do with the transformation of a proton to electron. This occurs with the change in the atomic number of the element. In this case, the parent nucleus that undergoes decay is carbon - 14.
The daughters nucleus will have the same mass number but a different atomic number. Let us now see the product of this reaction.
From the equation shown, this nuclear reaction would give Boron - 14 as the product.
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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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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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A Se ion has a mass number of 77 and a charge of −2
. Determine the number of neutrons, protons, and electrons in this ion.
number of neutrons:
number of protons:
number of electrons:
Answer:
neutrons = 71
protons = 6
electrons = 6
Explanation:
Hope this works :)
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
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:
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
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:
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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What is the volume of a metal with the mass of 24.6 g and a density of 4.0 g/mL?
The volume of a metal with mass of 24.6 g and a density of 4.0 g/mL is 6.15mL.
How to calculate density?The density of a substance is a measure of the mass of matter contained by a unit volume. It is measured in grams/litres.
The density can be calculated by dividing the mass by its volume as follows:
Density = mass ÷ volume
According to this question, a metal has a mass of 24.6 g and a density of 4.0 g/mL. The volume can be calculated as follows:
Volume = 24.6g ÷ 4g/mL
Volume = 6.15mL
Therefore, the volume of a metal with mass of 24.6 g and a density of 4.0 g/mL is 6.15mL.
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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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when is science meaningful?
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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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.50 points
Which elemental family receives electrons in an ionic bond?
Responses
noble gases
metals
halogens
nonmetals
Answer: es no metales
Explanation:
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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How many silver atoms are there in 3.74 g of silver?
Express your answer using three significant figures.
2.01214904 × 10²² silver atoms are there in 3.74 g of silver
The most common isotope of silver has 60 neutrons, 47 protons, and 47 electrons. Silver is a soft metal with a glossy metallic luster under normal circumstances. It is exceedingly malleable and ductile (can be formed into a wire).
The molar mass of silver is as follows:
Molar mass of Ag = 107.8682 g/mol
The number of atoms in a molar mass is Avogadro’s number:
6.022140857 × 10²³
Therefore 3.8 g of silver contains 3.8 times 6.022140857 × 10²³ divided by 107.8682 that equals 0.03522818 times
6.022140857 × 10²³
= 2.01214904 × 10²² atoms.
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An IV is prepared to deliver 2.00 L of a saline solution to a patient with a drop factor of 60.0 gtt/mL and a drip rate of 115.0 gtt/min. How many hours will it take to deliver all of the solution?
2 hour 30 minute it take to deliver all of the solution
Normal saline is a cornerstone of intravenous solutions commonly used in the clinical setting IV saline to replenish lost fluids, flush wounds, deliver medications, and sustain patients through surgery, dialysis, and chemotherapy and saline IV have even found a place outside the hospital, as a trendy hangover remedy
Here given data is IV saline solution deliver = 2.00 L and drop factor = 60.0 gtt/mL and drip rate = 115.0 gtt/min.
We have to calculate hours = ?
So for calculating hours
Time = volume × drip rate
Time = 2.00 L × 115.0 gtt/min
Time = 230 means 2hours 30 minute
2 hours 30 minute will it take to deliver all of the solution
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