Plzz help mee asapp dmxkxksms
Answer:
1. a part of the soil that contains decayed plant or animal matter
2. erosion
3. topsoil
Explanation:
Hope this helped :)
When 100.0 mL of 1.000 M HCl is reacted with 100.0 mL of 1.000 M NH4OH, the solution’s temperature increases 7.01 °C. Calculate LaTeX: \DeltaΔHreaction in units of kJ/mol. The specific heat of the salt solution is 4.184 J/g-°C and the density is 1.010 g/mL.
Do not use units or labels in answer. Make sure answer has the correct sig figs.
Answer:
Explanation:
volume of solution = 100 + 100 = 200 mL
mass of reaction mixture = 200 x 1.010 = 202 g
specific heat of solution mixture = 4.184 J/g-°C
heat evolved = mass x specific heat x rise in temperature
= 202 x 4.184 x 7.01
= 5924.63 J
100 mL of 1 M HCl
= .1 L of 1M HCl will contain .1 mole of HCl
.1 mole reacts with .1 mole of NH₄OH to make 5924.63 J of heat
1 mole reacts with 1 mole of NH₄OH to make 59246.3 J of heat
heat of reaction = 59246.3 J / mol
= 59.246 kJ / mol
= 59.3 kJ / mol .
A sample of 18.0 g of O2 has a temperature of 350 K, and pressure of 0.720 atm. What is the volume of the sample?
Answer:
V = 22.36 L
Explanation:
Given data:
Mass of oxygen = 18.0 g
Temperature = 350 K
Pressure = 0.720 atm
Volume of gas = ?
Solution:
Number of moles of oxygen :
Number of moles = mass/molar mass
Number of moles = 18.0 g/ 32 g/mol
Number of moles = 0.56 mol
Volume of oxygen:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
0.720 atm × V = 0.56 mol × 0.0821 atm.L/ mol.K × 350 K
V = 16.1 atm.L /0.720 atm
V = 22.36 L
1) Describe the appearance of each of the three curves on your graph.
Answer:PROCESSING THE DATA To analyze the relationship between conductivity and volume, use this method to calculate the linear-regression statistics for your data. Then plot the linear regression curve on your graph. Note the conductivity of pure water: 0 uS/cm Conductivity Data Table Drops 1M NaCl(aq) 1M CaCl2(ag) (uS/cm) (uS/cm) 1 150 uS/cm 110 uS/cm 2 280 uS/cm 155 uS/cm 405 uS/cm 245 uS/cm 4 516 uS/cm 340 uS/cm 3 Use 1 mL = 20 drops to Plot Conductivity (in the y axis) vs. volume of each salt solution (x axis). Do a best fit straight line through these points. Make sure to use the pure water conductivity as your zero drop. On this same graph determine the slope for both the NaCl and CaCl2, make sure to use pure water as your 0 drop. Sketch your prediction of what you would expect the AlCl3 drops to look like.
Explanation:
Roger has a car that accelerates at 5 m/s2. If the car has a mass 0f 1000 kg, how much force does the car produce?
Answer:
The answer is 5000 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 1000 × 5
We have the final answer as
5000 NHope this helps you
Answer:
5OOON
Explanation:
IM SMARTTT
You start with 4800 grams uranium - 238. It's radioactive and goes
through alpha decay. How many grams remain after 7 half-lives.
Answer:
37.5g
Explanation:
The half-life is the time taken for a radioactive substance to decay to half its original composition;
Original composition here is = 4800g of U-238
How many grams remain after 7 half-lives;
After each life, the uranium reduces by half;
Amount remaining = 4800 x [tex](\frac{1}{2})^7[/tex]
= 37.5g
After 7 half lives, 37.5g of the original sample will remain.
Give reasons.
a.Steel is an alloy.
b.Sodium is a metal.
Answer:
steel is an alloy because steel when other elements comprising metals and nonmetals are added to Carbon steel , alloy steel is formed.Sodium is a metal because it is highly reactive metal.it is the member of alkali metal family about the periodic table .it has one electron in the outermost electron shell.Explanation:
Hope it's help !
1)
Radioactive materials have unstable
A)
nuclei
B)
electrons.
Delectron clouds.
D)
area of atom outside of nucleus.
Reactant A illustrates an example of which of the following?
Answer: molecules of an element
The diagram shown in the A section shows molecules of an element because they all look the same, and they are in circular shape.
- Best of Luck!
In order for photosynthesis to take place
what must be present?
Answer:
For photosynthesis to take place, plants need to take in carbon dioxide (from the air), water (from the ground) and light (usually from the sun)
Explanation:
Answer:
water carbon dioxide sunlight and the plant
Explanation:
The average titration volume of the 0.09876 M NaOH used in back titration is 29.59
ml. Calculate the number of mmoles of HCl in the 250 ml volumetric flask.
Answer:
The number of moles of HCl in the 250 mL volumetric flask is 0.003 moles
Explanation:
Firstly, we solve for the concentration of acid using the formula
CaVa/CbVb = nₐ/nb
where Ca is the concentration of acid
Cb is the concentration of base
Va is the volume of acid
Vb is the volume of base
nₐ is the number of moles of acid (from the equation)
nb is the number of moles of base (from the equation)
Ca × 250/0.09876 × 29.59 = 1/1
Ca = 0.09876 × 29.59/250
Ca = 0.012 M
To determine the number of moles of HCl acid present in the 250 ml volumetric flask, the formula for molarity is used
Molarity = number of moles ÷ volume (in liter or dm³)
Volume needs to be converted to liter; 250 ml ⇒ 0.25 L
Molarity of the acid is 0.012 M
From the formula above, number of moles = molarity × volume (in liter)
number of moles = 0.012 × 0.25
number of moles of acid = 0.003 moles
What is the limiting reagent when a 2.00 g sample of ammonia is mixed with 4.00 g of oxygen?
Answer:
Ammonia is limiting reactant
Amount of oxygen left = 0.035 mol
Explanation:
Masa of ammonia = 2.00 g
Mass of oxygen = 4.00 g
Which is limiting reactant = ?
Balance chemical equation:
4NH₃ + 3O₂ → 2N₂ + 6H₂O
Number of moles of ammonia:
Number of moles = mass/molar mass
Number of moles = 2.00 g/ 17 g/mol
Number of moles = 0.12 mol
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 4.00 g/ 32 g/mol
Number of moles = 0.125 mol
Now we will compare the moles of ammonia and oxygen with water and nitrogen.
NH₃ : N₂
4 : 2
0.12 : 2/4×0.12 = 0.06
NH₃ : H₂O
4 : 6
0.12 : 6/4×0.12 = 0.18
O₂ : N₂
3 : 2
0.125 : 2/3×0.125 = 0.08
O₂ : H₂O
3 : 6
0.125 : 6/3×0.125 = 0.25
The number of moles of water and nitrogen formed by ammonia are less thus ammonia will be limiting reactant.
Amount of oxygen left:
NH₃ : O₂
4 : 3
0.12 : 3/4×0.12= 0.09
Amount of oxygen react = 0.09 mol
Amount of oxygen left = 0.125 - 0.09 = 0.035 mol
How many grams of NH3 can be produced from 4.89 mol of N2 and excess H2.
Answer:
166.56g of NH3 are produced
Explanation:
The reaction of N2 with H2 to produce NH3 is:
N2 + 3H2 → 2NH3
Where 1 mole of N2 produce 2 moles of NH3
4.89 moles of N2 with excess of H2 produce:
4.89 moles N2 * (2 moles NH3 / 1 mole N2) = 9.78 moles NH3
As molar mass of NH3 is 17.031g/mol, mass of NH3 produced is:
9.78 moles * (17.031g / mol) =
166.56g of NH3 are producedwhat is an advantage of power plants powered by natural gas when compared to coal and oil
Which describes any compound that has at least one element from group 17
A.halide
B.noble gas
C.meltalloid
D.Transition metal
HELP
Which equation is balanced using the correct formulas and coefficients?
A. NaCl2 + F2 → NaF2 + Cl2
B. 2 NaCl + F2 → NaF + Cl2
C. 2 NaCl + F2 → 2 NaF + Cl2
D. O NaCl + F → NaF + CI
Answer:
answer is gonna be B
Explanation:
NaCl+F2= NaF+Cl2
Name the following compounds
Answer:
What are the compounds
Explanation:
Answer:
Where is the picture?
Explanation:
At STP, what is the volume of 4.50 moles of nitrogen gas?
A) 167 L
B) 3420 L
C) 101 L
D) 60.7L
In the following reaction, which species is reduced? Au(s) + 3NO3-(aq) + 6H+(aq) → Au3+(aq) + NO(g) + 3H2O (l) H+ N+5 O2- H2O Au
Answer:
NO3-
Explanation:
Given the reaction equation;
Au(s) + 3NO3-(aq) + 6H+(aq)→Au3+(aq) + 3NO2(g) + 3H2O (l).
We can consider the oxidation states of species on the left and right hand sides of the reaction equation;
Au is in zero oxidation state on the left hand side and an oxidation state of +3 on the righthand side.
NO3- is in oxidation state of +5 on the righthand side and NO2 is in + 4 oxidation state.
H+ is in + 1 oxidation state on both the left and right hand sides of the reaction equation.
Since reduction has to do with a decrease in oxidation number, it follows that NO3- was reduced in the reaction.
Other than a base and a sugar unit, which of the following is a component of a nucleotide?
A. sulfate group
B. nitrate group
C. phosphate group
D. carbonate group
Answer:
C. phosphate group
Explanation:
took quiz on edg
Answer:
C
Explanation:
EDGE 2022
how do the properties of alloys compare to the properties of the materials used to form them?
Answer:
An alloy is a mixture or metallic-solid solution composed of two or more elements. Examples of alloys include materials such as brass, pewter, phosphor bronze, amalgam, and steel. Complete solid solution alloys give single solid phase microstructure. Partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal history. An alloy’s properties are usually different from those of its component elements.
Examples of alloys include materials such as brass, pewter, phosphor bronze, amalgam, and steel. Complete solid solution alloys give single solid phase microstructure. Partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal history. An alloy’s properties are usually different from those of its component elements.
image
Steel: Steel is an alloy whose major component is iron.
Alloy constituents are usually measured by mass. An alloy is usually classified as either substitutional or interstitial, depending on its atomic arrangement. In a substitutional alloy, the atoms from each element can occupy the same sites as their counterpart. In interstitial alloys, the atoms do not occupy the same sites. Alloys can be further classified as homogeneous (consisting of a single phase), heterogeneous (consisting of two or more phases), or intermetallic (where there is no distinct boundary between phases).
Alloying a metal involves combining it with one or more other metals or non-metals, which often enhances its properties. For example, steel is stronger than iron, its primary element. Physical properties (density, reactivity, conductivity) of an alloy may not differ greatly from those of its constituent elements, but its engineering properties (tensile strength and shear strength) may be substantially different.
Explanation:
Which of the following statements is true? Fusion breaks apart nuclei; fission puts them together. Fission breaks apart nuclei; fusion puts them together. Fission and fusion have identical reactions.
Answers:
Fission breaks apart nuclei
Fusion puts them together.
======================================================
Explanation:
The term "fission" is related to the term "fissure" which means "a cut or divide", often describing a geologic feature of the earth (eg: a crack in the rock).
Fusion is the idea of putting things together, which is the opposite of fission. The term doesn't have to apply to nuclear fusion. It could be something like the fusing of two ideas to create one new idea.
Answer:
the 2nd one
Explanation:
Can someone please tell me the answer
Answer:
52.068 amu
Explanation:
To calculate the average atomic mass of chromium, you have to first multiply the abundance of an isotope with its mass.
49.946 × 0.0435 = 2.173
51.941 × 0.838 = 43.527
52.941 × 0.0235 = 1.244
53.939 × 0.095 = 5.124
Next, add up all of the values, and you will get the average atomic mass.
2.173 + 45.527 + 1.244 + 5.124 = 52.068 amu
For a substance to change phases, the amount of internal energy must change. Water exists in three phases: liquid, solid (ice), and gas (water vapor) Which of the following lists the phases in order of increasing total energ/?
gas, liquid, solid
O solid, gas, liquid
o solid, liquid, gas
O liquid, gas, solid
Answer:
Solid, liquid, gas
Explanation:
add thermal energy to solid and it becomes liquid, add thermal energy to liquid it becomes gas
What process that occurred in the Midwestern United States in the 1930s is now occurring in the Sahel region of Africa, south of the Sahara Desert?
Industrial pollution
Radioactive soil
Over fertilization of streams
Dust storms and desertification
Answer:
dust storms and desertification
Explanation:
Answer:
Dust storms and desertification
Explanation:
Helium is the second most abundant element in the universe, but it is rare in Earth’s atmosphere. Most of the helium used to fill balloons and blimps must be extracted from Earth’s crust. How do you think this helium formed?
Explanation:
Helium is produced in radioactive process that occurs in deep and underground formations. They differ from other atmospheric gases. These radioactive decay of heavier nuclides that are unstable started about the time when the earth was formed.
As they decay they give off lighter particles that can easily be broken down into more stable ones. One of the main product of the decay is alpha particles. They have the same atomic structure as helium These materials are trapped in underground formations.which of the following best defines an acid
Select all the words that describe what the elements have in common if they are located on the same PERIOD.
Orbitals
Rounds
Shells
Dots
Energy Levels
Circles
Answer:
Orbitals
Shells
Energy Levels
Explanation:
Elements in the same period will have the same energy levels which is the same as orbitals and shells.
The period of an element indicates the energy level in an atom. Elements in period 1 will have one energy level or shell or orbitals. Down a group this is not the case. The energy level increases from top to bottom. As we go down the group, we are transiting from one period to another.Consider the atom with the chemical symbol Ru.
What would be the mass number for an atom of Ru which has
52 neutrons?
Answer:
96.
Explanation:
(100 points) {brainliest}
Solar energy is light and heat from the sun that's harvested to produce electricity or otherwise provide energy. Which of the following statements best describes solar energy?
A. Solar energy is non-renewable because clouds sometimes block the sun.
B. Solar energy is non-renewable because the sun sets each night.
C. Solar energy is renewable because it will be available as long as the sun continues to burn.
D. Solar energy is renewable because it has a small carbon footprint.
Answer:
C
Explanation: