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.
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
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.
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
Create lattice for CaCl2
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.
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:
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
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
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
How many molecules ?
Answer:
42 millions of single cells
Which one of the following statements is NOT
applicable to molecular solids?
1. Molecular solids are usually excellent conductors of electric current.
2. Molecular solids have relatively low melting points.
3. Molecular solids are soft compared to covalent solids.
Answer:
1. Molecular solids are usually excellent conductors of electric current.
Explanation:
Molecular solids are actually insulators (prevent electricity).
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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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~
Part B
What do radio waves carry?
Answer:
information from station to receiver
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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"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
HELPPPPPP 25 POINTS Which of the following recommendations would be the best option to reduce the effects of the feedback loop pictured above?
Question 24 options:
Run the the air conditioning unit for a longer time to cool the surrounding air.
Build city building in a close grid pattern to disperse the heat energy.
Use energy sources that do not release greenhouse gases into the atmosphere.
Answer:
Use energy sources that do not release greenhouse gases into the atmosphere.
Explanation:
If you use energy that does not release greenhouse gases such as CO2 then the heat won't be trapped in our environment, thus less chances of global warming. Option A is nonsense, B does not make sense either. C is the only valid way.
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
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
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.
How many moles would be present in 9.54x 1023 molecules of ammonia?
Avogadro's law states that in every mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] particles.
This means that in [tex]9.54 \times 10^{23}[/tex] molecules, there are [tex]\frac{9.54 \times 10^{23}}{6.022 \times 10^{23}}=\boxed{1.58 \text{ moles (to 3 sf)}}[/tex]
Which one of these is NOT an example of producer?
Answer:
Sunlight
Explanation:
A producer include green plants, small shrubs, fruit, phytoplankton, and algae. None are which are "sunlight".
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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how to solve this? what is the calculation of 100ml of 0.1 N H2SO4 by diluting from original H2SO4.
Atomic mass of: O=16 , H=1 S=32
d H2SO4=1.08 purity%=98
I need the solution and I will give a 5 star and brainliest
The answer is 0.46 ml of the original H₂S0₄ and dilute to a final volume of 100 ml.
What is Normality ?Normality is a measure of concentration equal to the gram equivalent weight per liter of solution.
Normality = Number of gram equivalents × [volume of solution in litres]⁻¹
Preparing 100. ml of 0.1 N H₂S0₄
Eq. wt. of H₂S0₄ = 98/2=49
density of H₂S0₄= 1.08
Purity =98%
1 N H₂S0₄ = 49 gH₂S0₄ / liter
1 gm equiv wt /L x 1 gm equiv. wt / 2 = 98 / 2 = 49 g)
0.1 N H2SO4 = 4.9 g / L
To make 100 ml (0.100 L) we would need 4.9 [tex]\rm \frac{g}{L}[/tex] x 0.1 L
= 0.49 g H₂S0₄/100ml
Original density = 1.08 g / ml
with a purity of 98%,
this converts to 1.08 g x 0.98 = 1.058 g /ml
0.49 g H₂S0₄ x 1 ml / 1.058 g = 0.46 ml of original H₂S0₄needed
Therefore to make the desired solution
Take 0.46 ml of the original H₂S0₄ and dilute to a final volume of 100 ml.
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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!!! :)
Help please I really don’t understand
What is the concentration (molarity) of a solution created by dissolving 81.1 grams of Mg3P2 to create a 2.5 solution?
Answer:
The concentration of Mg3P2 solution = 0.24mol/L
Explanation:
Mass = 81.1g
Volume = 2.5L
Concentration (C) of a solution = [tex]\frac{Moles (n)}{Volume (V)}[/tex]
but moles = [tex]\frac{mass}{Molar mass}[/tex] and Molar mass of Mg3P2 = 134.88g/mol
Moles = [tex]\frac{81.1g}{134.88g/mol}[/tex]
= 0.60mol
hence the concentration can be calculated by;
C = [tex]\frac{0.60mol}{2.5L} \\[/tex]
= 0.24mol/L or 0.24M
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!!
Is this an:
Acid
Base
Neither
Answer:
it is a weak acid
acid
Explanation:
formaldehyde is a weak acid (pK greater than 13),
