Answer:
Temperature increase = ΔT = 2.08 °C
Explanation:
Given data:
Energy absorbed by plant = 4200 J
Specific heat capacity of soil = 0.84 J/g°C
Mass of soil = 2400 g
How much temperature increase = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
by putting values,
4200 J = 2400 g ×0.84 J/g°C × ΔT
4200 J = 2016 J/°C × ΔT
ΔT = 4200 J / 2016 J/°C
ΔT = 2.08 °C
Please help outttt:(
Explanation:
1)
2Fe+3Cl2 →2FeCl3
2)
CH4+2O2 → CO2 +2H2O
3)
SnO2+2H2 →2H2O +Sn
4)
2KOH + H2SO4 → K2SO4+2H2O
Which substance has a melting point greater than room temperature
O A. argon
O B. oxygen
O
C. mercury
O D. aluminum
Aluminum is solid at room temperature and will, therefore, have a melting point that is above room temperature.
Melting pointThe room temperature is about 25 degrees Celsius.
Argon and oxygen are gases at room temperature.
Mercury is a liquid at room temperature.
Aluminum, on the other hand, is solid at room temperature. Hence, its melting point is definitely somewhere above room temperature.
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what is the mass in grams of a sample of 7.3 x 10^23 molecules of (iodine heptafluoride) IF7
320 g IF₇
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.3 × 10²³ molecules IF₇
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of I - 126.90 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of IF₇ - 126.90 + 7(19.00) = 259.9 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 7.3 \cdot 10^{23} \ molecules \ IF_7(\frac{1 \ mol \ IF_7}{6.022 \cdot 10^{23} \ molecules \ IF_7})(\frac{259.9 \ g \ IF_7}{1 \ mol \ IF_7})[/tex]Multiply/Divide: [tex]\displaystyle 315.056 \ g \ IF_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
315.056 g IF₇ ≈ 320 g IF₇
What is Johann Dobereiner's contribution to the development of the periodic table?
PLEASE HELP!!
How many moles are present in 431.56 grams of sodium bicarbonate ( NaHCO3)?
Molar mass of sodium bicarbonate (NaHCO3) = 84.01 g/mol
Answer:
5.14mole
Explanation:
Given parameters:
Mass of sodium bicarbonate = 431.56g
Unknown:
Number of moles = ?
Solution:
To find the number of moles, we use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass = 84.01g/mol
Number of moles = [tex]\frac{431.56}{84.01}[/tex] = 5.14mole
Which element has the following complete electron configuration : 1s22s22p63s23p64s23d5?
Answer:
Manganese
Explanation:
The electronic configuration of the atom is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵
The powers in this configuration is the number of electrons in each orbital:
2 + 2 + 6 + 2 + 6 + 2 + 5 = 25
The compound has 25 electrons and it is Manganese
The electron configuration 1s22s22p63s23p64s23d5 corresponds to the element manganese (Mn).
In the electron configuration provided:
1s2 represents the filling of the 1s subshell with two electrons.
2s2 represents the filling of the 2s subshell with two electrons.
2p6 represents the filling of the 2p subshell with six electrons.
3s2 represents the filling of the 3s subshell with two electrons.
3p6 represents the filling of the 3p subshell with six electrons.
4s2 represents the filling of the 4s subshell with two electrons.
3d5 represents the filling of the 3d subshell with five electrons.
Based on this electron configuration, we can correctly identify the element as manganese (Mn), which has an atomic number of 25.
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When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid _____
O has no observable changes
O boils vigorously
O begins to boil
O evaporates
Answer:
O begins to boil
Explanation:
When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid suddenly begins to boil.
At this point the boiling point of the liquid has been reached. Further addition of heat energy will cause the liquid to boil vigorously Subsequently evaporation will start from the surface of the boiling liquid.The atmospheric pressure is the ambient pressure measured with the respect to the sea level pressure.Answer:
has no observable changes
Explanation:
Which of the following explains the VSEPR geometry of a carbon tetrachloride molecule? (5 points)
It is bent because there are four bonded pairs around carbon.
It is tetrahedral because there are four bonded pairs around carbon.
It is bent because there are two bonded pairs and two lone pairs around carbon.
It is tetrahedral because there are two bonded pairs and two lone pairs around carbon.
Answer:
(B) It is tetrahedral because there are four bonded pairs around carbon
Explanation:
CCl4 means four chloride ions bonded covalently with single carbon.
its coordination figure is:
CF = 1/2(Vallence of central atom + electrons donated from substituents - charge)
CF = 1/2(4 + 4.1 - 0)
CF = 4
Bond electrons = 4
Lone pair electrons = 0
Hence, CCl4 is tetrahedral
whats the unit for mass
Answer:
The unit for mass is the kilogram (Kg).
Explanation:
Hope this helped!! <3 good luckk!!
how did leeuwenhoek discover bacteria
Answer:
Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa. His extensive research on the growth of small animals such as fleas, mussels, and eels helped disprove the theory of spontaneous generation of life.
Explanation:
Hope this helps and have a great day :)
Question 5 (5 points)
True or False. Open clusters are groups of up to a few thousand stars that are loosely held together by gravity and
tend to appear blue.
Answer:
have a p000000000000000000
Heat is transferred in all but which way.
Select one:
a. convection
b. sublimation
c. conduction
d. radiation
Btw I know it’s science but chem was closest thing to that
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Answer:
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Explanation:
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Help Please with this
mass = 325.2 volume = 62.5 cm what's the density ?
Answer:
159571 lb or cubic feet
Explanation:
8SnCl4
How many atoms
Answer:
i think i like 14 or 8 atom
Explanation:
Pls help me use the graph to answer the questions
Answer:
The first question is option 2
and the second question in option 1
Explanation:
When a substance has large or strongly-attracted particles, they do not flow freely. For example, water flows very quickly compared to honey. Which property of liquids does this example illustrate?
Answer:
Viscosity
Explanation:
Viscosity is how thick a liquid is due to internal friction.
A wave in which particles of matter vibrate at right angles to the direction
the wave travels is called a(n) wave.
Enter the answer
Check It
Answer:
it will transverse wave I think it will help you
Observe the image of sodium. List the properties you see.
Answer:
It is soft and white. It has a low melting and boiling point, a good conductor electricity, and reacts with water. Furthermore, it is also highly reactive, malleable, and ductile.
Explanation:
Hope I helped!
Answer:
silvery-white and waxy
Explanation:
Properties means the observations you can make just by looking at it or the qualities that the object has.
So when I looked at the sodium I saw a silvery-white metal (sodium is a metal), that has this waxy appearance to it.
describe the relationship between potential and kinetic energy
We know potential energy is position relative, and kinetic energy is motion relative. The primary relationship between the two is their ability to transform into each other. In other words, potential energy transforms into kinetic energy, and kinetic energy converts into potential energy, and then back again.
What is the product(s) of the reaction below?
2Al(s) + Fe2O3(s) ---> Al2O3(s) + 2Fe(s)
A. Solid aluminum oxide and solid iron
B. Solid aluminum
C. Saturated aluminum oxide and saturated iron
D. Iron(III) oxide and aluminum oxide
Answer:
A. Solid aluminum oxide and solid iron
Explanation:
The reaction equation is given as:
2Al + Fe₂O₃ → Al₂O₃ + 2Fe
The species on the left hand side are the reactants
Those on the right hand side of the expression are the products.
The products are:
Al₂O₃ and Fe
These are solid aluminum oxide and solid iron
Help asap, A student produced this results table to show the reactivity of the halogens. Explain what the results show.
Explanation:
The results shows the reactivity of the halogens and how they displace one another from any solution of their compounds.
The oxidizing power of the halogens decreases from top to down on the group. This explains why the more powerful oxidizing halogens displaces the less powerful one from simple salts.
We see that chlorine is able to displace Bromine and iodine
Bromine is only able to displace Iodine
Iodine cannot displace bromine or chlorine
Cu(NO3)2 is what compound?
Answer:
the compound's name is copper nitrate
Can someone help me plz!!!
Calculate the mass, in grams, of 2 moles of CaCl2.
Answer:
222.2 grams of CaCl2 in 2 moles
Explanation:
Mole=given mass/gram mass formula
2moles=x/Gram Mass Formula
(Gram Mass Formula of CaCl2):
Ca=40.1
Cl= 35.5 x 2= 71
-----------------------
GFM=111.1
2 moles = x/111.1 g
x=222.2
Lidia sets an empty metal pot on a hot stove burner. Which diagram best shows how heat from the burner will flow through the metal of the pot?
Answer:
The pan on the bottom right with the arrows pointing up.
Explanation:
conduction is the transfer of heat through touching surfaces, so when you place the pan on a hot stove, the heat heats up the bottom of the pan, and then the water in it.
The transfer of energy between systems through work is the expansion of gas in a steam engine. Therefore, the second diagram in the second row shows the correct direction of flow of heat.
What is energy transfer in thermodynamics?
Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. When heat flow through touching surfaces is called conduction. Heat flows in the upward direction from bottom in a pan.
Therefore, the second diagram in the second row shows the correct direction of flow of heat.
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What is the mass in grams of 0.40 moles of sodium borohydrate NaBH4
Answer:
Mass = 15.12 g
Explanation:
Given data:
Mass of sodium borohydride = ?
Number of moles of sodium borohydride =0.40 mol
Solution:
Formula:
Mass = number of moles / molar mass
Molar mass of sodium borohydride = 37.8 g/mol
By putting values,
Mass = 0.40 mol × 37.8 g/mol
Mass = 15.12 g
What is the molar mass of carbon (C)?
The molar mass of carbon (C) is 12.0107 u.
Answer:
Explanation:
The answer is 12.0107 u
Hope it helped you.
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What would be the answer for these?
1. 4
2. 4
3. 2
4. 2
Further explanationGiven
Reaction
2H₂+O₂⇒2H₂O
Required
Number of atoms
Solution
In compounds, the number of atoms of the constituent components in the form of elements is usually indicated by a subscript after the element symbol, while the number in front of the compound which is the coefficient indicates the number of molecules of the compound.
In chemical reactions, the reactants are on the left and the products on the right
1. Number of Hydrogen in reactants
2 molecules x 2 atoms = 4 atoms
2. Number of Hydrogen in products
2 molecules x 2 atoms = 4 atoms
3. Number of Oxygen in reactants
1 molecules x 2 atoms = 2 atoms
3. Number of Oxygen in products
2 molecules x 1 atoms = 2 atoms
The reaction is said to be balanced because the number of atoms of the element is the same between the reactants and products
Most polyatomic ions are cations.
TRUE
FALSE
The answer is False.