Which of the following is not true of atoms?
They are extremely small.
O They make up elements.
They can combine with other atoms.
O They are composed of water.
Answer:
they are composed of water
Answer:
guess its the last one should be right
Explanation:
prove me wrong
A sample of gas has a mass of 4.45 g and has a volume of 1095 mL at 711 torr and 23.0°C. What is the density of the gas?
Please help!!! I’ll mark brainlist
Explanation:
they are closer and made of gas
Which of the following factors will affect the freezing point of a solution?
The concentration of the solute only.
Neither the concentration nor type of solute.
The type of solute used only.
Both the concentration and type of solute.
The freezing point of the solvent in a solution changes as the concentration of the solute in the solution changes (but it does not depend on the identity of either the solvent or the solute(s) particles (kind, size or charge) in the solution).
Generally, pressures lower than 1 atmosphere lower the temperature at which a substance freezes, but for water, a higher pressure gives a lower freezing point. The force from a pressure change figures into the molecular forces already at play in a substance.
Solid calcium hydroxide is dissolved in water until the pH of the solution is 10.44. Determine the concentration of the calcium hydroxide in the solution.
Answer:
1.38x10⁻⁴ M
Explanation:
First, we calculate the pOH of the solution, using the given pH:
pOH = 14 - pHpOH = 14 - 10.44pOH = 3.56Now we calculate the concentration of OH⁻, using the pOH:
pOH = -log[OH⁻][OH⁻] = [tex]10^{-pOH}[/tex] = 2.75x10⁻⁴ MFollowing the reaction Ca(OH)₂ → Ca⁺² + 2OH⁻, we divide [OH⁻] by 2 to calculate [Ca(OH)₂]:
[Ca(OH)₂] = 2.75x10⁻⁴ M / 2 [Ca(OH)₂] = 1.38x10⁻⁴ MThe concentration of the calcium hydroxide in the solution is 1.38 * 10⁻⁴ M
pH:pH is calculated using the expression:
[tex]pH = - log [H_3O^+][/tex]
Given:
pH of the solution = 10.44
Calculation of pOH of the solution, using the given pH:[tex]pOH = 14 - pH\\\\pOH = 14 - 10.44\\\\pOH = 3.56[/tex]
Calculation for concentration of OH⁻, using the pOH:[tex]pOH = -log[OH^-]\\\\[OH^-] = 2.75* 10^{-4} M[/tex]
From the reaction:Ca(OH)₂ → Ca⁺² + 2OH⁻
The concentration of OH⁻ is then divided by 2 according to the given reaction.
[tex][Ca(OH)_2] = \frac{2.75*10^{-4}M}{2}\\\\[Ca(OH)_2] = 1.38*10^{-4}M[/tex]
Thus, the concentration of the calcium hydroxide in the solution is 1.38 * 10⁻⁴ M.
Find more information about pH here:
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For each of the pictures below, decide what element it comes from and circle atom or
ion Then write the chemical symbol and the charge if any.
Answer:
#1 Atom
Oxygen
Charge neutral atom
#2 ion
Oxide ( oxygen anion)
Charge 2-
Formula O2-
#3 Atom
Flourine
Neutral atom no charge
#4 atom
Flourine
Neutral atom no charge
#5 ion
Sulphide
Charge 2-
S2-
#6 ion
Chloride Cl-
Charge -1
#7 atom
Chlorine
No Charge neutral
#8 ion
Calcium ion cation
Charge 2+
Ca++
#9 atom
Hydrogen (protium)
No charge neutral
#10 atom
Hydrogen (deutrium)
No charge neutral
#11 ion
Proton H+
Charge +1
#12 atom
Helium
No charge neutral atom
Explanation:
To find charge we need difference in proton and electron if proton are equal to electron then this is neutral atom
If electron are more this is negative charge ion
For example in oxygen 8 proton and 10 electron its charge is negative 2
If proton are more this is positive charge ion
For example in calcium 20 proton and 18 electron positive ion is formed.
According to the picture, the name of each element along with its charge and chemical symbol is as follows:
Picture 1 represents an oxygen atom that is neutrally charged. Picture 2 represents an oxide ion (oxygen anion), formula [tex]O^2^-[/tex]. Picture 3 represents a fluorine atom that is a neutrally charged atom.Picture 4 also represents a fluorine atom that is a neutrally charged atom.Picture 5 represents a sulfide ion with the charge of [tex]2^-[/tex]. Picture 6 represents a chloride ion with a charge of -1. Cl-Picture 7 represents a chlorine atom with a neutral charge. ClPicture 8 represents a calcium ion with the charge of +2 (cation).Picture 9 represents a neutral hydrogen atom (protium).Picture 10 represents a neutral hydrogen atom (deuterium).Picture 11 represents a hydrogen ion with a charge of +1. Picture 12 represents a neutrally charged helium atom. (He)What is a chemical element?A chemical element may be defined as the characteristics of atoms that possess a given number of protons in their nuclei, along with the number of neutrons including the pure substance typically consisting only of that species.
Therefore, according to the picture, the name of each element along with its charge and chemical symbol is well mentioned above.
To learn more about Chemical elements, refer to the link:
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The enthalpy of vaporization for water is 40.67 kJ/mol and the enthalpy of fusion for water is
6.01 kJ/mol. What is the enthalpy of deposition?
Answer:
[tex]\Delta H_{dep}=-46.68kJ/mol[/tex]
Explanation:
Hello!
In this case, since vaporization is the processes by which a liquid goes to the gas phase, fusion by which a solid goes to liquid and deposition by which a gas goes to solid; we infer that the following set up relates the enthalpies associated to each process:
[tex]\Delta H_{fus}+\Delta H_{vap}=-\Delta H_{dep}[/tex]
Because deposition goes from a state with more energy to a state with less energy, therefore it is negative; in such a way, by plugging in we obtain:
[tex]\Delta H_{dep}=-(\Delta H_{fus}+\Delta H_{vap})\\\\\Delta H_{dep}=-(6.01kJ/mol+40.67kJ/mol)\\\\\Delta H_{dep}=-46.68kJ/mol[/tex]
Best regards!
What is the male reproductive part of the plant that produces pollen
Answer:
Stamen
Explanation:
Answer:
stamen
Explanation:
The stamen is the male reproductive organ. It consists of a pollen sac (anther) and a long supporting filament.
Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 3.45 g of hexane is mixed with 19. g of oxygen. Calculate the minimum mass of hexane that could be left over by the chemical reaction. Round your answer to significant digits.
10. Identify the products in the combustion of methane.
(1 Point)
a. CO2 and H20
O b. CH4 and 02
O c. O2 and H20
O d. CH4 and CO2
Answer:
a. CO2 and H20
Explanation:
Chemically, this combustion process consists of a reaction between methane and oxygen in the air. When this reaction takes place, the result is carbon dioxide (CO2), water (H2O), and a great deal of energy. The following reaction represents the combustion of methane:
CH4[g] + 2 O2[g] -> CO2[g] + 2 H2O[g] + energy
One molecule of methane, (the [g] referred to above means it is gaseous form), combined with two oxygen molecules, react to form a carbon dioxide molecule, and two water molecules usually given off as steam or water vapor during the reaction and energy.
A student sets up the following equation to solve a problem in solution stoichiometry. (The ? stands for a number the student is going to calculate.) Enter the units of the student's answer. (0.34 L)(1 mL/10^-3 L) (0.58 g/mL)/(64.63 g/mol) = ?
Answer:
The units are moles.
Explanation:
Hello!
In this case, considering the following dimensional analysis operation:
[tex]0.34L*\frac{1mL}{1x10^{-3}L} *\frac{0.58g}{1mL} *\frac{mol}{64.63g}[/tex]
We can see liters, milliliters and grams are cancelled out as they are put at both denominators and numerators; it means that the final units are moles.
In addition, the result should be:
[tex]3.1mol[/tex]
Which has two significant figures as the data is given with two significant figures.
Best regards
Does silver form a gas? Yes or no.
Answer:
Yes it does
Explanation:
Silver is a chemical element with the symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.[citation needed] The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.
A 7.298 g sample of copper reacts with oxygen, forming a copper oxide. The final mass of the copper oxide is 8.217 g. What is the formula of the copper oxide
Answer:
Cu2O
Explanation:
We get mass of Cu and O in copper oxide.
Cu = copper
O = Oxygen
Cu = 7.298g
Then the mass of o is given as
CuO - Cu
= 8.217 - 7.298
= 0.919g
Then we get the number of moles
n = m/M
m = mass
M = molar mass
M of Cu = 63.55g/mol
M of oxygen = 16g/mol
n(copper) = 7.298/63.55
= 0.1148mol
n(oxygen) = 0.919/16g
= 0.0574mol
From here we get the molar ratio
n(copper)/n(oxygen)
= 0.1148/0.0574
= 2/1
Cu:O = 2:1
Cu2O is therefore the formula of copper Oxide
Which natural forces can weather and erode rock? Check all that apply.
clouds
ice
heat
water
wind
u don't have to rush but help please
Answer:
The answer would be ice, heat, water, and wind. (Hope this helps).
Answer:
the last four options
ice
heat
water
wind
Explanation:
edg2020
One of the products of the combustion reaction below:
C5H12 + O2 → CO2 + _____ is
1. C2H5OH 3. CH4
2. H2O 4. NO
Answer:
H₂O
Explanation:
Chemical equation:
C₅H₁₂ + O₂ → CO₂ + H₂O
Balanced chemical equation:
C₅H₁₂ + 8O₂ → 5CO₂ + 6H₂O
The given reaction is combustion reaction. The balance equation shows that there are equal number of moles of carbon, hydrogen and oxygen on both side of equation thus it follows the law of conservation of mass.
Combustion reaction:
The reaction in which substance react with oxygen and produced carbon dioxide and water.
Mostly hydrocarbons burns in the presence of oxygen and form carbon dioxide and water.
What is the mass of 5 moles of Fe2O?
Explanation:
1 miole of Fe2O is 6.22 × 10^-23
5mole of Fe2O = 5×6.22×10^-23
=31.1×10^-23
Mass of 5 moles of [tex]Fe_2O[/tex] is 636 g.
Formula for the calculation of mass is as follows:-
[tex]Number\ of\ mole=Mass/Molar mass[/tex].......(1)
The molar mass of [tex]Fe_2O[/tex]is [tex]2\times55.6\ g+16\ g=127.2 \g[/tex]
So ,the mass of 5 moles of [tex]Fe_2O[/tex]is as follows:-
[tex]5\ mol=Mass/127.2\ g/mol\\5\ mol/times127.2\ g/mol=Mass\\636\ g=Mass[/tex]
Hence, the mass of 5 moles of [tex]Fe_2O[/tex] is 636 g.
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when one end of a short, metal bat is heated, the opposite end will eventually become hot. which of the following processes transfers the heat through the bar?
a.condensation
b. conduction
c. convection
d. radiation
Answer:
No Its c
Explanation:
-_-
Magnate is to weak as philosopher is to:_______
A. History B. Thoughtless C. Strong D. Logic
Answer:
Thoughtless
Explanation:
A magnate usually refers to a wealthy and an influential business person.
But here, it is referred to as weak. So what this question requires from us is to give the antonym of philosopher.
A philosopher is one who is usually a logical person. That is he uses logic. Now the antonym for logic is thoughtless.
So if magnate is to weak, then philosopher is to thoughtless.
True or false let me know ASAP
Answer:
false
Explanation:
In any chemical reaction, the atoms of any substance that you begin with, you must end with follows the ___
Law of Definite Proportions
Law of Conservation of Mass
Rule of Zero
Law of Multiple Reactions
Answer:
IAM at exam sorry that's why I can't answer
What is the ionic equation for the following
2FeCl(aq)
3Mg(s)
3MgCl(aq)
2Fe(s)
Answer : The net ionic equation will be,
[tex]2Fe^{3+}(aq)+3Mg(s)\rightarrow 3Mg^{2+}(aq)+2Fe(s)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The given balanced ionic equation will be,
[tex]2FeCl_3(aq)+3Mg(s)\rightarrow 3MgCl_2(aq)+2Fe(s)[/tex]
The ionic equation in separated aqueous solution will be,
[tex]2Fe^{3+}(aq)+6Cl^{-}(aq)+3Mg(s)\rightarrow 3Mg^{2+}(aq)+6Cl^{-}(aq)+2Fe(s)[/tex]
In this equation, [tex]Cl^{-}[/tex] is the spectator ion.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]2Fe^{3+}(aq)+3Mg(s)\rightarrow 3Mg^{2+}(aq)+2Fe(s)[/tex]
A precipitate is a solid that sometimes forms when two liquids combine.
A true
B False
A precipitate is a solid that sometimes forms when two liquids combine.
Answer:A. True
Explanation:Because the Precipitate it's forms solid when two liquids combine to precipitate. #CARRYONLEARNING #STUDYWELLA precipitate is a solid that sometimes forms when two liquids combine.
Choosing:A. True
B. False
Answer:A. True
#READINGHELPSWITHLEARNING #CARRYONLEARNING #STUDYWELLHeat energy can be transferred from a source to a receiver by
I. radiation.
II. convection.
III. conduction.
A.
I, II, and III
B.
II only
C.
I only
D.
III only
Answer:
It's I, II, and III
Explanation:
Trust me.
What is the molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL.
a) 0.528 M
b) 0.436 M
c) 0.479 M
d) 0.048 M
e) 22.9 M
Answer:
a. 0.528 M ..
Explanation:
Hello!
In this case, since the given by-mass percent can be written as:
[tex]\frac{10gCdSO_4}{100g\ sol}[/tex]
By using the density and molar mass of the solute, cadmium sulfate, we can compute the molarity, by also making sure we convert from mL to L of solution:
[tex]M=\frac{10gCdSO_4}{100g\ sol}*\frac{1molCdSO_4}{208.46gCdSO_4} *\frac{1.10g\ sol}{1mL\ sol} *\frac{1000mL\ sol}{1L\ sol} \\\\M=0.528M[/tex]
Thereby, the answer is a. 0.528 M .
Best regards.
which action describes chemical weathering
A. Water carving out a limestone cave
B. Water cutting downward to deepen a river channel
C. Water freezing and thawing to widen cracks in rock
D. Water depositing beach sand
(Note: This is from Earth Science)
Answer:
A
Explanation:
just took the test and it’s right
The action that best describes chemical weathering is water carving out a limestone cave.
CHEMICAL WEATHERING:
Weathering generally means the breakdown of rocks into smaller particles. Weathering can occur either chemically or mechanically. Chemical weathering is caused by chemical reactions involving water. Water reacts with minerals in rocks and dissolves it into new substances. Therefore, the action that best describes chemical weathering is water carving out a limestone cave.Learn more at: https://brainly.com/question/18346756?referrer=searchResults
Please help
What is the formula for pentaboron nonahydride?
SRPH
What is the solution to log (9x)-log 3 = 3?
Answer:
[tex]\frac{1000}{3}[/tex]
Explanation:
Given problem:
log 9x - log 3 = 3
To solve this problem, we need to find the value of x for which when the expression is simplified, we would a solution of 3;
From log rules;
log a - log b = log [tex]\frac{a}{b}[/tex]
So;
log 9x - log 3 = 3
log( [tex]\frac{9x}{3}[/tex]) = 3
log 3x = 3
So;
3x = 10³
x = [tex]\frac{1000}{3}[/tex]
This data was collected after conducting an experiment about the amount, in liters, of water a specific plant needs per month. An accepted value for the measurement is 6 liters. These are the collected experimental values.
Which values in the collected data are precise? Check all that apply.
1.1 liters
1.2 liters
1.5 liters
6.0 liters
8.1 liters
Answer:
1.1 liters
1.2 liters
1.5 liters
Explanation:
Precision in data refers to how close the experimental values of an experiment are to one another irrespective of the true or accepted value. In other words, a set of values are said to be PRECISE if they are close to one another.
In this case, data was collected after conducting an experiment about the amount, in liters, of water a specific plant needs per month. However, according to the set of experimental values provided, only 1.1 litres, 1.2litres and 1.5litres are close to one another and, hence, are said to be PRECISE even if they are not close to the accepted value of 6litres.
Answer:
1.1 liters
1.2 liters
1.5 liters
Explanation:hope you do good in edge
classify the chemical equation CaCO3 → CaO + CO2
This is displacement reaction.
Nicotine can be made when the following ammonium salt is treated with Na2CO3. Draw a stepwise mechanism for this reaction. N N N nicotine CH3 NH2CH3 Na2CO3 NaHCO3 NaBr
Answer:
Explanation:
The mechanism showing the process of the reaction is as follows:
From the given information, the starting compound includes a bromine atom & a protonated primary amine group. At the initial stage, dissociation of sodium carbonate occurs to form carbonate ions. This is followed by the attraction of a proton by the carbonate ion from the protonated amine group.
After that, there is a nucleophilic attack on the carbon atom at the nitrogen site by a bromine atom which results in the formation of a cyclic product. Finally, deprotonation of the nitrogen atom occurs to form Nicotine.