The three classes of lever include first, second and third class lever.
What are levers?Levers are simple type of machine that are used to transfer the force used to lift a load.
Examples of lever include the following:
First class lever: This is the type of lever where the fulcrum is between the load and the effort.Second class lever: This is the type of lever that has the load between the fulcrum and effort.Third class lever: This is the type of lever that has the effort between the fulcrum and the load.Therefore, the three classes of lever include first, second and third class lever.
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How many molecules ?
Answer:
42 millions of single cells
What is the [H+] in a solution if the [OH-] = 5.42 x 10-5 M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
What is pH scale ?The pH scale is used to rank solutions in terms of how acidic or how basic they are.
It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.
These ion concentrations are equal in pure water, which has a pH of 7.
The hydrogen ion and hydroxide ion are related as
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[OH^{-}] }[/tex]
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[5.42\times10^{-5} ] }[/tex]
[tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
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How many grams of LiOH are needed to make 25 mL of a 0.125 M solution?
Please explain because I have no idea how to solve this
Answer:
0.0734 grams LiOH
Explanation:
The molarity formula looks like this:
Molarity (M) = moles / volume (L)
You are given the molarity and volume (in mL). Therefore, you can plug these values into the equation and solve for moles (after you convert from mL to L).
25 mL / 1,000 = 0.025 L
0.125 M = moles / 0.025 L
(0.125 M) x (0.025 L) = moles
0.003125 = moles
After using the molarity formula, we know that 0.003125 moles LiOH are needed to satisfy these conditions. Now, we can convert this to grams using the molar mass of LiOH. This can be determined using the values from the periodic table. Remember to write your conversion in a way that allows for the units to cancel out.
Molar Mass (LiOH) = 6.941 g/mol + 16.00 g/mol + 1.008 g/mol
Molar Mass (LiOH) = 23.499 g/mol
0.003125 moles 23.499 g
------------------------ x ------------------- = 0.0734 grams LiOH
1 mole
0.074 grams of lithium hydroxide are needed to make 25 ml of 0.125 M solution, according to the concept of molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Here , in the problem mass is to be determined, hence the formula used is the first one mentioned.
Substituting values in the formula,mass=molar concentration×molar mass×volume in liters
∴0.125×23.95×0.025=0.074 g.
Hence, 0.074 g of lithium hydroxide are required to prepare 25 ml of 0.125 M solution.
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A student suggests that Earth's climate is changing, partly because of human activities such as burning fossil fuels (i.e. coal, oil, and natural gas), which pumps carbon dioxide (CO2) into the atmosphere. To support her suggestion, she prepares a graph that shows changes of Earth's average temperature and changes in atmospheric CO2 concentration over the past 150 years. Which contains data?
A. the student's suggestion
B. the graphs
C.fossil fuels
D. the act of burning fossil fuels
Please help!!!!!!
The graph shows the change in concentration of one of the species in the reaction
A + B + C→D + E.
If the graph indicates the reaction rate, then the concentration of which species is plotted?
A
B
C
E
Answer:
E.
Explanation:
Look at change in concentration over time...is it increasing or decreasing? It is increasing right as you can see because it starts at 0 then increases and plataeus. What increases in a reaction, reactant or product? Products increase right cuz your reactants react with each other to make prodcuts.
At start of reaction you have no products (zero) thus this graph starts at 0. At end you have alot of product thus over time the concentration of product increases.
ABC are reactants their concentration should decrease over time
DE are products, they should increase as reaction goes on.
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°c to 70.0°c when 2,520 j of heat is applied? use q equals m c subscript p delta t.. 0.00420 j/(gi°c) 0.00661 j/(gi°c) 238 j/(gi°c) 252 j/(gi°c)
Answer:
0.00420
Explanation:
The equation is Q=mc(T(final)-T(initial), where c is the specific heat, Q is heat supplied, m is mass, T(final) is final temperature and T(initial) is initial temperature (you'll see this written as delta T, which means change in temperature).
2520 = Q
m = 10.0kg; answer choices are in g, not kg, so multiply by 1000 to get m in g; m = 10000 g
Plug in the values you have and solve for c.
2520=(10000)(c)(70-10)
2520=600000c
c=0.0042 j/(gc)
Answer:
4.2 j/kg-C = .0042 j / (g-C)
Explanation:
Specific heat units are j / kg-C
2520 J / [ (10 kg)(70-10 C)] = 4.2 j / kg-C
If a 1.75 liter solution contains 0.877 moles of CuCO3, what is the molarity?
Answer:
0.50 Molar or 0.50 Mol/L
Explanation:
Molarity = [tex]\frac{Moles of Solute}{Litres of solution}[/tex]
Molarity = n / V
Given: Volume of solution(V): 1.75 Litres
Moles of solute(n): 0.877
Substituting values,
Solution:
Molarity = [tex]\frac{0.877}{1.75}[/tex]
Molarity = 0.50 Molar (rounded off to the nearest decimal place)
∴ Molarity = 0.50 Molar/ 0.50 Mol/L
Nitrogen gas was collected by water displacement. What was pressure of the N, collected if the temperature was 22 °C?
The pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
What is atmospheric pressure?
The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.
Atmospheric pressure = 101.325 kPa
Vapor pressure of water at 22°C = 2.6427 kPa
Pressure of N₂ = (Atmospheric pressure) - (vapour pressure of water at 22°C)
Pressure of N₂ = (101.325 kPa) - ( 2.6427 kPa)
Pressure of N₂ = 98.6823 kPa
Therefore, the pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
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Help please I really don’t understand
What is the boiling point of liquid c when the
Answer:
100 degree is the answer of given statement
A state government is trying to decide between using biomass or nuclear power to generate electricity. What advantage does biomass have over nuclear power?
0
A. Biomass does not produce pollution
0
B. Biomass releases less carbon dioxide.
0
C. Biomass is a nonrenewable source.
A
D. Biomass produces no radioactive waste
Answer:
D Biomass produces no radioactive waste
Explanation:
Question 7
The periodic table shows that a carbon atom has 6 protons. This means that a carbon atom also has
A
6 nutrons
B
6 electrons
С
More protons than electrons
D
An atomic mass that equals 6
Answer:
Carbon has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons.
what occurs when the moon moves through Earth's shadow
Answer:
A Lunar eclipse
Explanation:
A Lunar eclipse occurs only when the sun,earth and moon are exactly aligned with earth .
This can be viewed twice in calendar years.
It's a Lunar Eclipse.
A lunar eclipse is the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon. A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
Define ionization energy. Describe how ionization energy impacts ionic bonding.
Answer: I can’t explain how it impacts ionic bonding but I can tell you what ionization energy is.
Explanation:
ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.
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!!! :)
The graph in part A shows how slow-moving water cannot carry large pieces of sediment. As water slows down on the inside of a curve, some of the larger pieces of sediment will settle out of the water. What effect will the settling of sediment have on the shape of the stream?
The river will deposit sediment along the inside of a bend in the river. This deposition causes the inside of the curve to become shallower and move farther inward.
What are Meandering Rivers ?Rivers flowing over gently sloping ground begin to curve back and forth across the landscape. These are called meandering rivers.
Meandering rivers erode sediment Larry from the outer curve of each meander bend and deposit it on an inner curve further down stream.
This causes individual meanders to grow larger and larger over time.
Meandering river channels are asymmetrical. The deepest part of the channel is on the outside of each bend. The water flows faster in these deeper sections and erodes material from the river bank.
The water flows more slowly in the shallow areas near the inside of each bend. The slower water can't carry as much sediment and deposits its load on a series of point bars.
Thus the settling of sediment will make the stream steeper.
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Answer:
The river will deposit sediment along the inside of a bend in the river. The deposition causes the inside of the curve to become shallower and move farther inward.
Explanation:
Edmentum
C. Uprooted plants dry and die. Why?
Because:
Their roots are no longer in the soil. Thus, can't absorb water and mineral ions needed for plant growth via photosynthesis.
Hope this helps!
Answer:
Yes
Explanation:
Well this is because when a plant is planted water goes from the soil, into the roots then finally distributed to other parts of the plant.
So when plants have been plucked or uprooted water no longer has access to the plant which may result to the plant being dried up and will possibly die
how many mL of 0.1M HCl are required to react completely with 1 g mixture of [tex] Na_{2}CO_{3}[/tex] and [tex] NaHCO_{3} [/tex] containing equimolar amounts of both ?
ty! :)
Answer:
158 mL
158 mL of 0.1 M of HCl is required to react completely with 1 g mixture of Na2CO3 and NaHCO3, containing equimolar amounts of both
Explanation:
hope helpez -,-~
btw masoom bachi copied me~
The chemical reaction that is produced by modelage masks causes:
Answer:
an increase in temperature
Explanation:
The chemical reaction that is produced by modelage masks causes: an increase in temperature
Clarence grew three bearded iris plants. He put one in direct sunlight, one in
the shade, and one in the dark. The plant in the sun grew the most quickly and
looked the healthiest. Clarence concluded that bearded iris plants grow best
in the sun.
How would you evaluate Clarence's conclusion?
A. His conclusion is valid because his experiment included a control.
B. His conclusion is flawed because it is based on the appearance of the plants
C. His conclusion is flawed because he did not perform enough trails
D. His conclusion is bailed because he tested only one variable
"write the chemical equation between hydrogen (h) and carbonate (CO3) and the product(s)"
Answer:
On heating sodium hydrogen carbonate (NaHCO3). It decomposes to form sodium carbonate (Na2CO3), water (H2O) and carbon dioxide (CO2)
(ii) 2NaHCO3(s)Heatsodiumcarbonate(sodaash)Na2CO3(s)+CO2(g)+H2O(l)
Answer:
Explanation:
2H + + CO3 2- = H2CO3
A tank (not rigid) contains 2.3L of
helium gas at 25°C. What will be the
volume of the tank after heating it
and its content to 40°C temperature
at constant pressure?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert
Temp to Kelvin25°C=298K40°C=313KApply Charles law
V1T2=V2T12.3(313)=298V2719.9=298V2V2=2.4LAnswer:
See below ~
Explanation:
Q1
Given :
V₁ = 2.3LT₁ = 25°C = 298 KT₂ = 40°C = 313 KUnknown :
V₂Formula :
V₁/T₁ = V₂/T₂ (Charles Law)Solution :
2.3/298 = V₂/313V₂ = 313/298 x 2.3V₂ = 1.05 x 2.3V₂ = 2.42 LFinal Answer :
2.42 LQ2
Given :
P₁ = 1.01 atmV₁ = 6 LV₂ = 3 LUnknown :
V₂Formula :
P₁V₁ = P₂V₂Solution :
1.01 x 6 = P₂ x 3P₂ = 1.01 x 2P₂ = 2.02 atmFinal Answer :
2.02 atmwhat 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.
Which type of solid has the weakest forces holding it together?
lonic
Network
Molecular
Metallic
Answer:
network
Explanation:
ionic is strongest
chegg
A network is the type of solid that has the weakest forces holding it together.
What is it meant by the network?A network, in computing, is a group of two or extra gadgets or nodes that could talk. The gadgets or nodes in question can be connected through physical or wi-fi connections. The key is that there are at least separate components, and they may be connected.
A home wireless LAN (wireless local area network, or Wi-Fi network) is a good example of a small client-server network. Various devices in the home are wirelessly connected to a router that acts as the central node (server) in the home.
A network is a collection of computers, servers, mainframes, community gadgets, peripherals, or other devices related to permitting facts sharing. An example of a network is the net, which connects hundreds of thousands of people everywhere in the global.
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How many grams sodium bromide can be formed from 51 grams of sodium hydroxide?
Explanation:
When working with moles only, you will start by applying stoichiometry to determine how the reactants will affect your amount of products in this reaction. For this question, we will assume that other reactants are in infinite qualities, so therefore, it is the amount of aluminum that we will be concerned with. You need to figure out how much aluminum is in the specified amount of aluminum bromide, and then how much aluminum hydroxide that will be able to create. Make sure all your units cancel out!
9.24 mol AlBr3 x (1 mol Al / 1 mol AlBr3) x (1 mol Al(OH)3 / 1 mol Al) = 9.24 mol AlBr3
When you're working with mole ratios that involve grams to moles conversions, the first thing you want to do is calculate the molecular weight of each component you are being asked about. Because the question was given to you as words instead of chemical formulas, you will want to figure out the chemical formulas. For example, aluminum hydroxide is Al(OH)3 and aluminum bromide is AlBr3. To calculate molecular weight, you will want to consult a periodic table, find the molecular weight for each atom, and then calculate the correct sum of each molecular weight. Make sure you keep track of the number of each atom you have, i.e. 3 oxygen and 3 hydrogen for aluminum hydroxide.
Na = 22.990 g/mol
O = 15.999 g/mol
H = 1.008 g/mol
NaOH = 22.990 g/mol + 15.999 g/mol + 1.008 g/mol = 39.997 g/mol
Al = 26.982 g/mol
O = 15.999 g/mol
H = 1.008 g/mol
Al(OH)3 = 26.982 g/mol + (3 x 15.999 g/mol) + (3 x 1.008 g/mol) = 78.003 g/mol
Now, if you begin with an amount of NaOH in grams, you will first have to convert that to moles in order to use the mole ratio.
24 g NaOH x (1 mol NaOH / 39.997 g NaOH) = 0.600 mol NaOH
Now, you will have to account for the part of the sodium hydroxide that will be present in the aluminum hydroxide. In this case, it is the hydroxide (OH) portion of the formula. There is one mole of OH in each mole of NaOH, but there are 3 moles of OH in each mole of Al(OH)3. You will start with the 0.600 mol NaOH you know you have and then use the mole ratio.
0.600 mol NaOH x (1 mol OH / 1 mol NaOH) x (1 mol Al(OH)3 / 3 mol OH) = 0.200 mol Al(OH)3
Finally, when you are converting from grams to grams, you will have to find the molecular weight of both the reactant and the product, convert reactants in grams to reactants in moles, then use the mole ratio, then convert the moles of product back to grams of product. This time, you are concerned about the mole ratio of sodium, as that is the element that is in both chemical formulas.
Calculate the molarity of 0.060 moles NaHCO3 in 1500. mL of solution
Answer:
= 0.4 M
Explanation:
data:
moles = 0.060 moles
volume = 1500 ml
= 1500 / 1000
= 1.5 dm^3
solution;
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.060 / 1.5
molarity = 0.4 M
In a spacecraft tge carbon dioxide exhaled by the astronaut can be removed by the reaction with lithium hydroxide, LiOH according to the following; CO2(g) + LiOH(g) = LiOH(s) + H2O(l) how many moles of Lithium hydroxide are required to react with 30 moles of CO2, average exhaled by each person
Answer:
30 moles
Explanation:
From the equation it is a one - to - one reaction
0.0030 x 8.65=
report answer to correct number of significant figures.
The result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595. Details about multiplication can be found below.
What is multiplication?Multiplication is the process of computing the sum of a number with itself a specified number of times, or any other analogous binary operation that combines other mathematical objects.
Multiplication as an operation increases a number.
According to this question, the following expression is given: 0.0030 x 8.65 = 0.02595
Therefore, the result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595.
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calculate the mass of copper that could be made from 4.0g of copper oxide
The mass of copper that will be produced from copper oxide is determined as 3.19 g.
Mass of copper produced from copper oxide
The mass of copper that will be produced from copper oxide is calculated as follows;
2Cu + O₂ -----> 2CuO
2 1 2
2(63.5) ------------ 2(79.5)
x ---------------------- 4 g
x = (4 x 2 x 63.5)/(2 x 79.5)
x = 3.19 g
Thus, the mass of copper that will be produced from copper oxide is determined as 3.19 g.
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If an atom has 7 protons, 8 neutrons, and 10 electrons, then it has a net charge of . On the other hand, if an atom has 3 protons, 3 neutrons, and 2 electrons, its net charge is .
Answer:
Neutrons play no role in the net charge of an atom, so you can ignore them here.
Proton = 7
Electron = 10
Net Charge = 7 - 10
= -3
Again,
Proton = 3
Electron = 2
Net Charge = 3 - 2
= 1
