Answer:
Trees can be planted, grown up and harvested for wood and other things. it can be maintained by properly watering them when they are young trees or during a drought.
Explanation:
hope this helps!
The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are:
69.2% for a mass of 63
30.8% for a mass of 65.
Answer:
Take the weighted average of the individual isotopes.
Explanation:
63
C
u
has
69.2
%
abundance.
65
C
u
has
30.8
%
abundance.
So, the weighted average is
62.93
×
69.2
%
+
64.93
×
30.8
%
=
63.55
amu
.
If we look at the Periodic Table, copper metal (a mixture of isotopes but
63
C
u
and
65
C
u
predominate) has an approximate atomic mass of
63.55
g
⋅
m
o
l
−
1
, so we know we are right.
Hey does anyone know how to find valence electrons in any periodic table element?
Answer:
Number of valence electrons = Group number of the element on the periodic table.
Explanation:
Hope that helps ^^
How did Ernest Rutherford's experiment relate to J.J. Thomson's work?
A Rutherford looked for magnetic fields, while Thomson looked for electric
fields.
B Rutherford repeated Thomson's experiment and confirmed the results.
C Rutherford tested a conclusion based on Thomson's results.
D Rutherford had not known about Thomson's experiment.
Answer:
D
Explanation:
I am sorry if wrong
Answer:
C
Explanation:
I tested the other answer and it was wrong, when I put C I got 100... Your welcome!
Is it acceptable to simply add the partial pressure of each species to determine the total pressure? why or why not?.
In a redox reaction, which reactant is the oxidizing agent? the reducing agent?.
Answer:
An oxidizing agent is a reactant that gains electrons and that is reduced. A reducing agent is a substance that causes the reduction of another substance, meaning that the reactant is losing electrons therefore it is oxidized.
Explanation:
Which process is separating out solute from a solvent through evaporation?.
Crystallisation
(used to separate solids from a solution)
Hope this helps!
Explain the difference between a metal and a nonmetal
WILL GET BRAINLIEST!!!!!
The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3). NH4NO3 Right arrow. N2O 2H2O A chemist who is performing this reaction starts with 160. 1 g of NH4NO3. The molar mass of NH4NO3 is 80. 03 g/mol; the molar mass of water (H2O) is 18. 01 g/mol. What mass, in grams, of H2O is produced? 9. 01 grams 18. 01 grams 36. 03 grams 72. 06 grams.
72.06 grams is the mass of produced H₂O in the given reaction.
How we calculate mass from moles?Mass of any substance can be calculated by using moles as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
NH₄NO₃ → N₂O + 2H₂O
From the stoichiometry of the reaction it is clear that:
1 mole of NH₄NO₃ = produce 2 mole of H₂O
Given mass of NH₄NO₃ = 160.1 g
Molar mass of NH₄NO₃ = 80.03 g/mole
Mole of NH₄NO₃ = 160.1 g / 80.03 g/mole = 2 moles
2 moles of NH₄NO₃ = produce 2 × 2 = 4 moles of H₂O
Molar mass of H₂O = 18.01 g/mol
So, required mass of H₂O will be calculated as:
W = 4mol × 18.01 g/mol = 72.06 grams
Hence, 72.06 grams is the mass of H₂O.
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What effect do you think boiling and freezing would have on amylase enzyme.
Answer:
boiling have an effect while freezing so not
What is the pressure (in millimeters of mercury) inside a container of a gas connected to an open-end manometer when the level in the arm connected to the container is 203.3 mm in height lower than the level in the arm open to the atmosphere? Atmospheric pressure is 757.1 mm Hg and the density of mercury is 13.546 g/mL.
Answer:
See explanation below
Explanation:
In this case, you just need to apply the following expression:
Pc = Patm + h + d1/d2
Where:
Pc: Pressure of container
Patm: Atmospherical pressure
h: height of the arm of manometer
d1: density of gas
d2: density of mercury
You are not providing the density of the gas which is filled the container, so, let's assume we are filling this with hexane (d = 0.65 g/mL)
We have all in mm Hg so we just need to apply the above expression:
Pc = 757.1 + 203.3 * (0.65/13.546)
Pc = 757.1 + 9.7553
Pc = 766.8553 mmHg
Choose the atom or ion that is larger.
Select one:
a. S
b. S-2
Answer:
In general, anions are larger than the corresponding neutral atom, since adding electrons increases the number of electron-electron repulsion interactions that take place. Cations are smaller than the corresponding neutral atoms, since the valence electrons, which are furthest away from the nucleus, are lost.
Explanation:
The ion S⁻² (sulfide ion) is larger than the atom S (sulfur atom).
b. S⁻²
Atoms are composed of a nucleus at the center, containing protons and neutrons, and a cloud of electrons surrounding the nucleus. The size of an atom is determined mainly by the arrangement and energy levels of its electrons.
When an atom gains electrons to become an ion, it undergoes a process called electron gain or electron attachment. In this case, sulfur (S) has six valence electrons (electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁴). It tends to gain two electrons to achieve a stable electron configuration similar to the nearest noble gas, argon (Ar: 1s² 2s² 2p⁶ 3s² 3p⁶). By gaining two electrons, sulfur forms the sulfide ion (S⁻²), which has an electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁶.
When an atom gains electrons to become an ion, it forms a negatively charged ion, and this is the case for S⁻². The extra electrons in the ion's electron cloud cause repulsion, leading to an increase in the ion's size compared to the neutral atom. In other words, the addition of two extra electrons in the S⁻² ion increases its electron cloud's size, making it larger than the S atom.
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Choose the correct products for the double replacement reaction below. Click here to access the solubility rules to determine which product, if any, forms a solid precipitate in the reaction. PbCl2 MgSO4Upper C subscript 3 upper H subscript 8 plus upper O subscript 2 right arrow. ? Pb O2 MgCl PbMg ClSO4 PbSO4 MgCl2 Pb(SO4)2 MgCl.
MgCl₂ & PbSO₄ is the correct product for the given double replacement reaction.
What is double displacement reaction?In the double displacement reaction displacement of two substrate will take place among two reactants and formation of products takes place.
In the question, PbCl₂ reacts with MgSO₄ and displacement between the cations takes place and formation of MgCl₂ and insoluble precipitate PbSO₄ is formed.
Given reaction is represented as:
PbCl₂ + MgSO₄ → MgCl₂ + PbSO₄
According to the activity series, reactivity of Magnesium is more as compared to the lead atom. So lead is displaced by the magnesium atom and form the above given products.
Hence, option (3) is correct i.e. MgCl₂ & PbSO₄.
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Answer:
1st Question: C
2nd Question: A
Explanation:
bc i said so
someone please help me i dont understand how too do these
Answer:
0.55
Explanation:
When multiplying values, the number of significant figures in the answer should be the same as the number with the lowest sig figs in the problem which in this case is 2 sig figs (0.17)
3.22 * 0.17 = .5474
Rounded to 2 sig figs = 0.55
Match the following.
1.
an agreement to temporarily cease fighting
recession
2. an economic setback in commercial and industrial activity
reparations
3. indemnities paid by defeated countries for acts of war
armistice
Answer:
The answer is number 1
Explanation:
this is because cease means to stop,and recession also means to squeeze
What is the maximum number of electrons possible in energy level 4?.
Answer:
I think its 32 electrons
Explanation:
im so sorry if im wrong!
Answer:
32 electrons :)
Explanation:
What is the charge
on an electron?
-1
O
+1
+2
What type of chemical reaction is the following: CH4 + O2 ➜ CO2 + H2O
Complete combustion of an alkane (methane)
You're essentially burning CH4 in the excess presence of oxygen gas, which results in the liberation of water and carbon dioxide
Which of theses best explains whether alchemy is a science or pseudoscience?
If a beach ball has a volume of 261 L at a temperature of 502 K, what will be the new
temperature of the balloon if the volume decreases to 176 L? Formula: V/T, -V2/T2
The new temperature of the balloon if the volume is decreased to the given amount is 338.5K.
Charles's law
Charles's law states that the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
Given the data in the question;
Initial volume; [tex]V_1 = 261L[/tex]Initial temperature; [tex]T_1 = 502K[/tex]Final volume; [tex]V_2 = 176L[/tex]Final Temperature; [tex]T_2 = \ ?[/tex]
To determine the new temperature as the volume is decrease, we substitute our given values into the expression above.
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\\\V_1T_2 = V_2T_1\\\\261L * T_2 = 176L * 502K\\\\261L * T_2 = 88352L.K\\\\T_2 = \frac{88352L.K}{261L}\\ \\T_2 = 338.5K[/tex]
Therefore, the new temperature of the balloon if the volume is decreased to the given amount is 338.5K.
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*30 POINTS*
Now build the complete circuit. Connect a wire to each end of the pair of batteries. Then add the lightbulb and the switch, using additional wires as needed. To disconnect two parts, click where they’re joined, and then click Split Junction. You can also click Reset All to start over. You’ll be successful when you can close the switch (click, hold, and drag it) and the lightbulb glows. Use the drawing tool to sketch the parts of your successful circuit.
Based on the data provided, the electric circuit is completed when the key is closed.
What is an electric circuit?An electric circuit is a complete path through which electric current flows
An electric circuit can either be:
An open circuitA closed circuit A short circuitAn electric circuit consists of :
A power source e.g. batterieswiresloads A keyTherefore, an electric circuit is completed when all the components are connected and the key closed.
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Answer:
Explanation: HAVE A GREAT DAY EVERYONE <3
11. To “see” the spaces in matter, add one cup of______. The total volume is ______.two cups, since alcohol has a lot of______ between molecules, where water molecules can_______.
According to the forces of attraction, to “see” the spaces in matter, add one cup of alcohol.The total volume is less than two cups, since alcohol has a lot of spaces between molecules, where water molecules can fill.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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The bond line formula,
represents the molecular formula
A
C₂ H18
C₃H15
Answer:
C8H18
Explanation:
The end carbons have 3 hydrogen atoms each and the ones in the middle have 1 hydrogen atom each which gives. (3 x 5) + (1 x 3) = 18 hydrogen atoms
A 65.0 g sample of copper (specific heat = 0.20 J/g °C) is heated to 97.6 °C and then
placed in a container of water at 20 °C. The final temperature of the water and copper is
24.9 °C. What is the mass of the water in the container, assuming that all the heat lost
by the copper is gained by the water?
A 65.0 g sample of copper at 97.6 °C is added to 46.1 g of water at 20 °C, reaching a final temperature of 24.9 °C.
What does the law of conservation of energy state?In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
Step 1: Calculate the heat lost by the sample of copper.A 65.0 g (m) sample of copper is cooled from 97.6 °C to 24.9 °C. Given that its specific heat (c) is 0.20 J/g.°C, we can calculate the heat (Q) lost using the following expression.
Q(Cu) = c(Cu) × m(Cu) × ΔT
Q(Cu) = (0.20 J/g.°C) × 65.0 °C × (24.9 °C - 97.6 °C) = -945 J
Step 2: Calculate the heat gained by the water (Qw).We will use the law of conservation of energy.
Qw + Q(Cu) = 0
Qw = -Q(Cu) = 945 J
Step 3: Calculate the mass of water.We will use the same expression as in Step 1.
Qw = c(w) × m(w) × ΔT
m(w) = Qw / c(w) × ΔT
m(w) = 945 J / (4.18 J&g.°C) × (24.9 °C - 20 °C) = 46.1 g
A 65.0 g sample of copper at 97.6 °C is added to 46.1 g of water at 20 °C, reaching a final temperature of 24.9 °C.
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Sophia had been reading about the history of the Earth. She was surprised at the different ways geologists learn about the ages of rocks. Why is it important for geologists to use both relative and absolute ages to determine the age of rocks? A. Scientists want to learn about the age of rocks.
B. Scientists need only one way to determine the age of rocks.
C. Scientists may not be able to determine the absolute age of some rocks.
D. Scientists can tell the age of rocks using the law of superposition
Both relative and absolute ages of te rock are important because, scientists want to learn about the age of rocks.
What is rock?The rock is part of the solid part of the earth. rocks are studied by geologists in order to determine the actual age of the rock. The age of a rock can tell us a lot about the rock.
We must know that rocks tell something about the earth hence scientists want to learn about the age of rocks.
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How many moles are in 28.2 grams of sodium?
O 648 moles
O 1.69 moles
O 1.23 moles
O 7.38 moles
Take the given weight (28.2 g) and divide it by the atomic weight of sodium.
The atomic mass can be found under the element symbol on the periodic table. The atomic mass for sodium is 22.98 g.
28.2/22.98 = 1.23 moles
Therefore, there are 1.23 moles in sodium.
Calculate the pOH of this solution. Round to the nearest hundredth. PH = 1. 90 pOH =.
Answer:
it's 12.10
Explanation:
pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions. The pOH of this solution is 12.10.
What is pH and pOH ?pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions.
It is a scale used to determine the solution's hydrogen ion ( H⁺ ) concentration. It is a scale used to determine the solution's hydroxide ion ( OH⁻ ) concentration.
The difference between the two is that [OH-] represents the concentration of [OH-] or the molarity of OH-. It basically represents the concentration of OH- that is produced when a strong base reacts with water for example. pOH is a value that represents the basicity of a solution.
pH + pOH = 14
1.90 + pOH =14
pOH = 14 - 1.90
pOH = 12.10
Thus, the pOH of this solution is 12.10.
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1. What is a metal replacement reaction?
Answer:
a reaction in which one element is substituted for another element in a compound
Explanation:
what is the mass of an isotope with 8 protons and 7 neutrons?
Answer:
15 amu.
Explanation:
I looked it up on google.
In an exercise to teach students how to use an analytical balance, the instructor gives a student a one dirham coin which has been pre-weighed ( accepted value)as 4.6026 g. The weight that the student obtains for the same one dirham coin is 4.6013 g. What is the percentage error in the students' reading
Answer:
0.028%
Explanation:
From the question given above, the following data were obtained:
Accepted value = 4.6026 g
Measured value = 4.6013 g.
Percentage error =..?
Thus, we can obtain the percentage error in the student's reading as follow:
Percentage error = |measured value – accepted value|/accepted value × 100
Percentage error = |4.6013 – 4.6026| / 4.6026 × 100
Percentage error = 0.0013 / 4.6026 × 100
Percentage error = 0.13/4.6026
Percentage error = 0.028%
Therefore, the percentage error in the student's reading is 0.028%
Did I do number one correctly???
Explanation:
yup you are right. The answer is 2,3- Dimethyl butane