Answer:
Lithium
Explanation:
lithium because metallic character decreases down the group and lithium comes before in group then calcium
Please help! Urgent!
Given the reaction: 2CH3OH(l) + 3O2(g)—> 2CO2(g) + 4H2O(g) how many liters of O2(g) are needed to produce exactly 200 liters of CO2
0. Calculate the amount of heat absorbed when 5.50 g of aluminum is heated from
25.0°C to 95.0°C. The specific heat of aluminum is 0.897 J/g °C).
Answer:
34.5J
Explanation:
Amount of Heat(Q) = mc∆T
where m (mass of aluminum) = 5.50g
c (specific heat capacity of aluminum) = 0.897J/g°C and ∆T = 95.0°C - 25.0°C = 70.0°C
Q = 5.50x 0.897x 70.0
= 34.5354J = 34.5J
The amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.
What is heat?Heat is defined as a form of the energy transmitted from one body to another as a result of a temperature difference.
It can also be defined as the potential energy stored in the bonds that hold the object's particles together.
Heat absorption is defined as absorption of heat without increasing the temperature at the certain point.
Amount of heat = mcΔT
Where m = 5.50g
c = 0.897 J/g °C
ΔT = 95.0°C - 25.0°C
= 70.0°C
So, amount of heat = 5.50 x 0.897 x 70.0
= 34.5354 J = 34.5 J
Thus, the amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.
To learn more about heat, refer to the link below:
https://brainly.com/question/1429452
#SPJ2
The mass of the door handle is 140 g, and 10 % of its mass is copper. How many *
MOLES of copper does the handle contain?
0.22 moles
Explanation:Moles are a measurement used in chemistry that describes the amount of an atom based on the number of atoms. One mole is equal to [tex]6.022*10^{23}[/tex], which is the number of atoms in 12 grams in Carbon-12.
Mass of Copper
Before finding the moles of copper, we need to know the mass. We are told that a door handle is 140g, but only 10% is copper.
To find 10% for 140 we can multiply 140 * 0.1.
140 * 0.1 = 14This means there are 14 grams of copper.
Moles of Copper
Now, we can use dimensional analysis to convert grams to moles. To do this we need to know how many grams of copper are in 1 mole. This number is called the molecular mass and can be found on the periodic table. This number is usually directly below the element's symbol and is the only number with decimal points (not all periodic tables will have the exact same molecular mass because the number can change, but they will be close).
The molecular mass for copper is 63.55. Next, we can set up a dimensional analysis conversion. Dimensional analysis is when you multiply some value by a ratio of 2 different values with 2 different units. This may sound confusing but it makes more sense when you do it.
[tex]14 g*\frac{1 mole}{63.55g}[/tex]When setting up an expression like this, make sure that the units cancel out so you are only left with the one you want. Units will cancel out if one is in the numerator of a ratio and the other is in the denominator.
Next, multiply this out (which is equivalent to dividing 14/63.55)
[tex]14 g*\frac{1 mole}{63.55g} = 0.22 moles[/tex]So, when rounded to significant figures, there are 0.22 moles in 14 grams of copper.
SCIENCE!
Kaila was organizing data about the rise in popularity of computers and internet usage
in the US. She made a table with the percentages of home with computers and internet access. Which of the following is NOT a reason that home computer and internet usage have increased?
A.more options for computer technologies
B.better offsite storage facility and server farms
C.home computers contain better technology and can be cheaper
D.better reliability of data transmissions
what is the most important thing to know about the general term "discrepant event"?
Answer:
Discrepant events — demonstrations that produce unexpected outcomes — are used in science to capture students' attention and to confront their beliefs about a “phenomenon by producing an outcome which is contrary to what their previous experiences would lead them to believe is true” (Misiti, 2000, p.
Write the formula unit equation for this reaction occuring in water:
Calcium sulfide and iron(II) bromide are mixed to form iron(II) sulfide and calcium bromide.
1. CaS(aq) + FeBr(aq) →FeS(s) + CaBr(aq)
2. CaS(aq) + Fe2Br(aq) →Fe2S(s) + CaBr2(aq)
3. CaS(aq) + FeBr2(s) →FeS(s) + CaBr2(aq)
4. CaS(aq) + FeBr2(aq) →FeS(s) + CaBr2(s)
5. CaS(aq) + FeBr2(aq) →FeS(s) + CaBr2(aq)
6. CaS(s) + FeBr2(aq) →FeS(s) + CaBr2(s)
7. CaS(aq) + FeBr2(aq) →FeS(aq) + CaBr2(aq
The formula unit equation for the given reaction occurring in water is
CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq).
What is chemical reaction?
Chemical reactions are those reaction in which reactant molecules react with each other for the formation of product.
When calcium sulfide reacts with iron (II) bromide for the formation of iron(II) sulfide and calcium bromide will be represented through the following equation:
CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq)
Above reaction best explains the formula unit of given reaction as all valency of atoms are satisfied there.
Hence, the required formula unit is CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq).
To know more about chemical reactions, visit the below link:
https://brainly.com/question/26018275
#SPJ1
What is the repeating unit in this polymer? −CH2−CCl2−CH2−CCl2−CH2−CCl2−
The repeating unit in this polymer is −CH2−CCl2 (i.e., Methylene-Dichlorocarbene).
What is a polymer?In chemistry, a polymer is a molecule and/or structure composed of two or more repeating units.
These repeating units can be very reactive in a single composition or form a polymer when bound.
In conclusion, the repeating unit in this polymer is −CH2−CCl2 (i.e., Methylene-Dichlorocarbene).
Learn more about polymers here:
https://brainly.com/question/766968
#SPJ1
Bases contain hydroxide, which is a
Vanessa made a list comparing the differences between the outer coverings in plants and animals, but she made a mistake. Read the table and then choose the statement that explains why the list is incorrect.
The difference between the outer covering of plants and animals is that plant cell has cellulose cell wall while animal cell is surrounded by a cell membrane
What is a cell?A cell is the structural and functional unit of an organism which is capable of existing alone as it contains organelles that perform specific functions.
The plant cell is covered by a rigid cell wall which contains cellulose as its outer covering.
The animal cell contains not cellulose cell wall at its out covering but instead it is covered by a cell membrane.
Therefore, the difference between the outer covering of plants and animals is that plant cell has cellulose cell wall while animal cell is surrounded by a cell membrane.
Learn more about cell here:
https://brainly.com/question/18243320
#SPJ1
what is the molarity of a solution in which 0.381 moles of CuCl is dissolved in 1039ml of water
Answer:
= 0.366 M
Explanation:
data;
moles = 0.381 moles
volume = 1039ml
= 1039 / 1000
= 1.039dm^3
molarity = ?
solution
molarity = [tex]\frac{moles}{volume in dm^3}[/tex]
= 0.381 / 1.039
molarity = 0.366 M
A certain compound is made up of one carbon (C) atom, two chloride (Cl) atoms and one oxygen (o) atom what is the chemical formula of this compound
CO(Cl)2 will be the formula which has a common name of phosgene a highly poisonous gas .
1.consider the following overall reaction 6 CL + 2 AU³ → 3C L₂(g) + 2 AU (s)
(I) write down the cell notation for the cell
(i) Construct a fully labelled Galvanic cell for the reaction given above
Answer:
AU(s)| AU³||CL,Cl2|Pt(s)
Explanation:
I started with the anode on my left hand side because AU id undergoing oxidation and on the right hand side CL is undergoing reduction hence it's a cathode, and since for the cathode we don't have a metal in a solid state we are going to add Pt
what is the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water
Answer:
= 0.524M
Explanation:
data;
volume = 490ml
= 490 / 1000
= 0.49 dm^3
moles = 0.257 moles
molarity = ?
solution:
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.257 / 0.49
molarity = 0.524M
If 5.81 moles of magnesium (Mg) reacts to completion, how many moles of hydrochloric acid (HCI) are need to react with magnesium.
advantage of fossil fuels
Answer:
I don't know
Explanation:
I don't know the answer but it is use for car
A student weighs out 51.57 grams of sodium permanganate, NaMnO4. How many moles of NaMnO4 is this? The molar mass of NaMnO4 is 141.93 g/mol. Use the standard abbreviation for the units.
Your Answe
A student weighs out 51.57 grams of sodium permanganate. The moles of sodium permanganate is 0.363 mol.
What is molar mass?Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
The molar mass is given 141.93 g/mol.
To calculate the moles
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\rm Number\;of \;moles= \dfrac{51.57}{141.93} = 0.363\;mol[/tex]
Thus, the moles are 0.363 mol.
Learn more about molar mass
https://brainly.com/question/12127540
#SPJ1
a 20.0 L container of helium used to fill balloons is at a pressure of 150 atm and a temperature is 30.0 C. How many balloons can be filled to 5.0 L, if the temperature is 22 C and the atmospheric pressure is 1.05 atm?
The number of balloons that can be filled by the container of helium is 380.
To calculate the number of balloons that can be filled, we use the formula below.
Formula:
N = PVT'/P'V'T........... Equation 1\Where:
N = Amount of balloons that can be filled by the containerP = Pressure of helium in the containerV = Volume of helium the containerT = Temperature of the containerP' = Pressure of the balloonV' = Volume of the balloonT' = Temperature of the balloon.From the question,
Given:
P = 150 atmV = 20 LT = 30 °C = 203 KP' = 1.05 atmV' = 5 LT' = 22 °C = 295 KSubstitute these values into equation 1
N = (150×20×295)/(5×1.05×203)N = 380.4 balloonsN ≈ 380 balloons.Hence, the number of balloons that can be filled by the container of helium is 380.
Learn more about pressure here: https://brainly.com/question/25736513
#SPJ1
Based on the kinetic theory, which statement is true? (5 points)
O Matter consists of only large molecules.
Matter is made up of only charged particles.
The particles of matter have zero kinetic energy and potential energy.
O The particles of matter are arranged in different ways for the different states.
Answer:
the particles of matter are arranged in different ways for the different states
Explanation:
because solid liquid and gas all three matters have different states for example the particles in a solid are closely packEd and form of movement is vibration
Which sport is required to have both male and female competitors?
A. Water polo
B. Swimming
C. Hockey
D. Mixed doubles tennis
Answer:
D. Mixed doubles tennis
Explanation:
Mixed doubles tennis is just normal tennis but the 'mixed' means that on both teams there is both one man and one woman.
What branch of chemistry studies the flow of electrons?
A. Inorganic chemistry
B. Electrochemistry
C. Quantum chemistry
D. Organic chemistry
Answer:
Your answer is B, Electrochemistry!
Explanation:
This is the part of chemistry that studies the chemical process in which electrons flow. This flow is called electricity. Electricity is generated by the flow of electrons, from one element to another element. This reaction is called oxidation reduction.
Answer: B
Explanation:
Boyle's Law
A container holds 500 mL of CO2 at 20° C and 742 torr. What will be the volume of the CO2 if the pressure is increased to 795 torr?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert vol to L
500mL=0.5LApply Boyles law
P1V1=P2V2742(0.5)=795V2371=795V_2V2=0.467LV2=467mL[tex]\large{\underline{\underline{\pmb{\sf{\pink{Ꮧnswer:-}}}}}}[/tex]
P1=742 torrP2=795 torrV1=500mLV2=?T1=20∘C+273=293KT2=20∘C+273=293KP1V1 = P2V2
V2 =P1V1/P2
=(742×500)/(795) = 467mL CO2
When the atoms that are transition elements form ions, the __ electrons are lost before the _electrons are lost.
Answer:According to the Aufbau principle, the electrons fill the 4s sublevel before beginning to fill the 3d sublevel. However, the outermost s electrons are always the first to be removed in the process of forming transition metal cations.
Explanation:hope its help
Calculate the volume of a 1.50M HCl solution that contains 0.920 mol of HCI. (SHOW WORK)
Answer:
= 0.613dm^3
Explanation:
Data:
Molarity, M = 1.50M
no. of moles = 0.920 moles
volume=?
Solution:
as, molarity= [tex]\frac{moles}{volume in dm^3}[/tex]
so, volume =[tex]\frac{moles}{molarity}[/tex]
putting values:
= [tex]\frac{0.920}{1.50}[/tex]
volume = 0.613dm^3
Which of the following best describes science?
A. The use of experiments and investigations to form opinions
B. The study of the natural world in order to formulate answers to
untestable questions
C. The use of observations and experiments to answer questions
about the natural world
D. The study of the universe to answer philosophical questions
Answer:
c
Explanation:
Science is best described as a way of building knowledge about the world around us through observation and experimentation.
a student wants to fry an egg in a 1,770 g iron skillet. an egg will become firm at 70 degrees Celsius. the specific heat capacity of iron is 0.444. if the skillet begins at room temperature of 25 degrees Celsius, what is the minimum amount of energy that must be transferred to the skillet in order to fry the egg.
How would a scientist classify a centipede? 12 points!!! pls help.
A. Arthropod
B. Amphibian
C. Mammal
D. Reptile
How many mole of water would be found in 4.54 X 10 34 molecules of H2O help me please
Taking into account the definition of avogadro's number, in 7.54×10¹⁰ moles of water are 4.54×10³⁴ molecules of water.
Definition of Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of moles of H₂OYou can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of water, then 4.54×10³⁴ molecules are contained in how many moles of water?
amount of moles of water= (4.54×10³⁴ molecules × 1 mole)÷ 6.023×10²³ molecules
amount of moles of water= 7.54×10¹⁰ moles
Finally, in 7.54×10¹⁰ moles of water are 4.54×10³⁴ molecules of water.
Learn more about Avogadro's Number:
brainly.com/question/11907018?referrer=searchResults
brainly.com/question/1445383?referrer=searchResults
brainly.com/question/1528951?referrer=searchResults
#SPJ1
What will most likely cause a sudden wind to start blowing? Help ;-;
A. Clouds
B. Humidity
C. Precipitation
D. Air pressure
it is D. Air pressure!!! :)
Acids and bases are both what?
Answer:
Both acids and bases are electrolytes which means that they're good conductors of electricity. Acids and bases both produce ions in water solution. Acids release hydrogen ions (H+) whereas Bases release hydroxide ions (OH-). The process of mixing acid or a base in water is an exothermic one.
Answer:
Electrolytes
Explanation:
Both acids and bases are electrolytes which means that they're good conductors of electricity. Acids and bases both produce ions in water solutions. Acids release hydrogen ions (H+) whereas Bases release hydroxide ions (OH-). The process of mixing acid or a base in water is an exothermic one.
SI unit are used for scientific measurement why
Answer:
Explanation:
SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit systems.
Unit of Electric Charge: Unit of Wavelength
Unit of Mass: Unit of Velocity: