Answer:
original activity is 3600 cpm
Explanation:
3 half-lives = 450 cpm
2 half-lives = 900 cpm
1 half-life = 1800 cpm
answer = 3600 cpm
Inside a car that was at STP, a 1.33 L bottle warms up to 130 C. If the volume of the bottle remains constant, what is the pressure, in atm, inside the hot water bottle?
Answer:
[tex]P_2=1.48atm[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to infer this problem is about the application of the Gay-Lussac's gas law to relate the initial and final pressure and temperature as shown below:
[tex]\frac{P_2}{T_2} =\frac{P_1}{T_1\\ }[/tex]
Thus, solving for the final pressure, P2, and using the temperatures in Kelvins, we obtain:
[tex]P_2 =\frac{P_1T_2}{T_1 }\\\\P_2 =\frac{1atm*403.15K}{273.15K}\\\\P_2=1.48atm[/tex]
Regards!
What is the total number of atoms in the formula
Ca(ClO3)2?
Answer:
9 atoms
Explanation:
Ca=1
Cl=2
O=6
add them all
answer
cl atom is 2
ca atom is 1
o atom is 6
why do tectonic plates move to form volcano
When the tectonic plates try to walk to burger king, they always bump into each other because of how close together they are. Once in a while, a tectonic plate will get so pis sed of, it will form a volcano to let out its anger.
What is the oxidation state of S in S032-?
Α. -8
Β. -2
C. +4.
D. +6
Answer:
A
Explanation:
I think that is the ans but am not sure
Water is said to be a good solvent for polar solutes because it has a negative end and a positive end. This explains why (IONIC/COVALENT) compounds dissolve easily in water. Highlight one
Which statement describes an Arrhenius acid
Answer:
According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs. Hence, the correct statement is arrhenius acid produces hydrogen ions in solution.
The temperature of a 95.4 g piece of copper decreases from 48°C to 25°C when the copper releases - 849 J of heat. What is the specific heat of copper?
what is difference between pipette and flask
Answer:
Erlenmeyer flasks have a narrow neck over a conical base, while beakers are basically large open-mouthed glass jars with a lip and spout for pouring. Graduated cylinders are tall cylinders with a spout to pour liquids; they have hash marks on the side to measure the volume of their contents.
Explanation:
hope it helps you alot
2.00 liters of gas at 1.00 atm and conpresssed it to a pressure of 6.00 atm, what would the volume of the gas be
Answer:
[tex]V_2=0.5L[/tex]
Explanation:
From the question we are told that:
initial Volume [tex]V_1=2.00L[/tex]
initial Pressure [tex]P_1=1 atm[/tex]
Final Pressure [tex]P_2=6atm[/tex]
Generally the equation for Final Volume V_2 is mathematically given by
Since Boyle's law states
[tex]P_1V_1=P_2V_2[/tex]
[tex]V_2=\frac{P_1V_1}{P_2}[/tex]
[tex]V_2=\frac{2*1}{6}[/tex]
[tex]V_2=0.5L[/tex]
List some of the effects of the increased production of
greenhouse gases on the Earth
Answer:
See Explanation
Explanation:
Green house gases are those gases believed to be responsible for the trapping of infrared ray close to the surface of the earth. The effect of the buildup of such gases include;
1) Rise in global temperature; Greenhouse gases trap infrared rays close to the surface of the earth there by leading to a continuous rise in the temperature of the earth. This is known as global warming.
2)Climate Change; Increase in the concentration of greenhouse gases in the atmosphere leads to different patterns of climatic events. This gradual change in the pattern of climatic events is called climate change.
3)Melting of polar ice caps and flooding; Increase in the concentration of greenhouse gases and consequent increase in the earth's temperature leads to the melting of polar ice caps and subsequently flooding in various parts of the world.
Pollution is any waste product that damages an ecosystem
True or false?
Answer:
True!
Explanation:
Not only products cause pollution, but the smoke from factories, the gas from our cars. Hope this is helpful! ^^
B. Hot water
The specific heat capacity of water is 4.186J/g °C
Calculate the temperature change when 8000 j of heat is added to 3g of water.
Use the equation q=mcAT
C. Specific heat capacity
Water has a specific heat capacity of 4.186J/g °C
Concrete has a specific heat capacity of 0.880 J/g °C
If a kg of water and a kg of concrete sit out in the sun on a hot day which one will have a change of temperature faster?
Explain why?
Answer:
The heat capacity measures the amount of heat necessary to raise the temperature of an object or system by one degree Celsius.
LEARNING OBJECTIVES
Explain the enthalpy in a system with constant volume and pressure
KEY TAKEAWAYS
Key Points
Heat capacity is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. It is measured in joules per Kelvin and given by.
The heat capacity is an extensive property, scaling with the size of the system.
The heat capacity of most systems is not constant (though it can often be treated as such). It depends on the temperature, pressure, and volume of the system under consideration.
Key Terms
3x +14y=5xy
21y - x =2xy
Answer:
456789
Explanation:
Determine if each of the following will form a neutral, acidic, or basic solution and explain why. Show your work.
a) NaHSO4
b) Na2SO4
c) NH4CN
Answer:
For a: The given salt is acidic in nature.
For b: The given salt is neutral in nature.
For c: The given salt is neutral in nature.
Explanation:
Salts are formed by the combination of an acid and a base. There are 3 types of salt:
Acidic salt: It is formed by the combination of strong acid and weak base.Basic salt: It is formed by the combination of a strong base and weak acid.Neutral salt: It is formed by the combination of strong acid and strong base or weak acid and weak base.For the given options:
(a): [tex]NaHSO_4[/tex]
This salt is formed by the combination of sodium hydroxide (strong base) and the partial dissociation of sulfuric acid (strong acid). It also has a replaceable hydrogen ion which can be produced when dissolved in water. Thus, the given salt is acidic in nature.
(b): [tex]Na_2SO_4[/tex]
This salt is formed by the combination of sodium hydroxide (strong base) and sulfuric acid (strong acid).
Thus, the given salt is neutral in nature.
(c): [tex]NH_4CN[/tex]
This salt is formed by the combination of ammonium hydroxide (weak base) and hydrocyanic acid (weak acid).
Thus, the given salt is neutral in nature.
HELP WITH FINAL CHEM
Answer:
idvd has a very high performance and a lot more than just the right side to get it all out
A car reaches 80 km/hr, then suddenly crashed into a concrete wall. Without a seat
belt, the crash test dummy slams into the car's dashboard because
A the crash test dummy's kinetic energy drops to zero
B the dashboard is pushed backwards into the crash test dummy
C the crash test dummy continues its motion until acted upon by an unbalanced
force
D Gravity is pulling the crash test dummy in the direction the car is moving
Answer:
C
Explanation:
inertia
inertia is the reluctance of an object at rest or moving to change its state of rest or motion
because the car was moving, the dummy moves with the speed of the car..so when the crash happened the dummy continued to move..it was feeling reluctant to come to rest so was moving
Balancee por tanteo las siguientes ecuaciones químicas. Escriba el nombre a reactantes y productos. H2O5 + H2O ---> HNO3 Na2O + OH2O --> ONaOH
Answer:
a. N₂O₅ + H₂O ⇒ 2 HNO₃ (pentóxido de dinitrógeno + agua ⇒ ácido nítrico)
b. Na₂O + H₂O ⇒ 2 NaOH (óxido de sodio + agua ⇒ hidróxido de sodio)
Explanation:
Tenemos que balancear, por el método de tanteo, las siguientes ecuaciones químicas.
a. En la primera reacción, el pentóxido de dinitrógeno reacciona con agua para formar ácido nítrico. Es una reacción de síntesis o combinación.
N₂O₅ + H₂O ⇒ HNO₃
Podremos obtener la ecuación balanceada si multiplicamos HNO₃ por 2.
N₂O₅ + H₂O ⇒ 2 HNO₃
b. En la segunda reacción, óxido de sodio reacciona con agua para formar hidróxido de sodio. Es una reacción de síntesis o combinación.
Na₂O + H₂O ⇒ NaOH
Podremos obtener la ecuación balanceada si multiplicamos NaOH por 2.
Na₂O + H₂O ⇒ 2 NaOH
T = 409.5 K, P = 1.50 atm: V = ?L
Explanation:
T = 409.5 K, P = 1.50 atm: V = 22.4 L The ideal gas law is: PV = nRT where. P = pressure. V = volume n = number of moles.
How different foods affect glucose levels in the body virtual lab.
Carry out the procedures outlined in the virtual lab. In your own words, summarize the steps you used to complete the virtual assignment. Explain what the test (independent) variable was, and what the outcome (dependent) variable was.
What is independent variable and dependent variable? In your own words.
Answer: this might have something to do with the pancreas
Explanation:
the pancreas produces insulin if subject a produces more insulin than subject b the reaction to the glucose will be different the pancreas breaks down the glucose into sugar and protiens hope this helps
Where to connect the lines? Pls answer
Answer: The given factors are matched to the effect it would have on the reaction rate are as follows.
Increase reaction rate- Crushing the antacid tablet
- Using many antacid tables
- Adding a catalyst to the water
Decrease reaction rate- Cooling the water during the reaction
No effect on reaction rate- Adding food coloring to the water
Explanation:
When antacid tablet is crushed then there will be more number of particles available for reaction. Hence, more number of collisions will take place due to which rate of reaction increases.
Using many antacid tables will also increase the number of molecules due to which there will be more collisions. Hence, more will be it's rate of reaction.
A catalyst is defined as a substance which helps in increasing the rate of a reaction without itself getting consumed in the reaction.
Therefore, adding catalyst to the water will also increase the rate of reaction.
When water is cooled during the reaction then kinetic energy between molecules decreases due to which there will be less number of collisions. Hence, rate of reaction will decrease.
Adding food coloring will have no effect on the rate of reaction as it is only changing the color of solution and does not participate in the chemical reaction.
Thus, we can conclude that given factors are matched to the effect it would have on the reaction rate are as follows.
Increase reaction rate- Crushing the antacid tablet
- Using many antacid tables
- Adding a catalyst to the water
Decrease reaction rate- Cooling the water during the reaction
No effect on reaction rate- Adding food coloring to the water
If 4.03 x 102 mL of water vapor is at STP, then determine the mass, in grams, of the water vapor. Round your
answer to three significant figures.
Answer:
you me me
Explanation:
got me me
A seais usually defined as A.A body of freshwater that is not connected to the ocean B. A body of freshwater that is connected to the ocean C. A body of salt water that is not connected to the ocean D. Body of salt water that is connected to the ocean
Answer:
D. Body of salt water that is connected to the ocean
Explanation:
An ocean is a body of salt water which covers approximately 70% of the Earth's surface. About 97% of the Earth's water is comprised of ocean and as such it is the most prominent and defined feature of the Earth. There are basically four (4) categories of an oceanic basin and these are;
1. The Pacific ocean.
2. The Artic ocean.
3. The Atlantic ocean.
4. The Indian ocean.
A sea is usually defined as a body of salt water that is connected to the ocean and are surrounded (enclosed) by land partially.
Basically, a sea is formed where a land and an ocean meet and as a result, an ocean is usually bigger than a sea.
Some examples of seas around the world are Red sea, Mediterranean sea, Sargasso sea, Caribbean sea, Baltic sea, Caspian sea, Chuckchi sea, etc.
Answer:
Yes The Anwer is D Hope This Help:)
what is the first 30 elements in chemistry
Answer:
Hydrogen (H)
Helium (He)
Lithium (Li)
Beryllium (Be)
Boron (B)
Carbon (C)
Nitrogen (N)
Oxygen (O)
Explanation:
that's the main ones I know
Answer:
H,He,Li,Be,B,C,N,O,F,Ne,Na,Mg,Al,Si,P,S,Cl,Ar,K,Ca,Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn...
Explanation:
H stands for hydrogen
He stands for helium
Li stands for lithium
Be stands for beryllium
B stands for boron
C stands for carbon
N stands for nitrogen
O stands for oxygen
F stands for fluorine
Ne stands for neon
Na stands for sodium
Mg stands for magnesium
Al stands for aluminum
Si stands for silicon
P stands for phosphorus
S stands for sulfur
Cl stands for chlorine
Ar stands for argon
K stands for potassium
Ca stands for calcium
Sc stands for scandium
Ti stands for titanium
V stands for vanadium
Cr stands for chromium
Mn stands for manganese
Fe stands for iron
Co stands for cobalt
Ni stands for nickel
Cu stands for copper &
Zn stands for zinc
HOPE THIS ANSWER WILL HELP YOU!!!
Are bonds ever truly 100 % ionic or 100 % covalent and why?
what is the total number of protons in carbonate, CO2/3- please help
Answer:
30 positive charged protons
Can anyone please suggest me a good and easy project topic for physics and chemistry. For class nine or ten students.Please please please help me.
An experiment requires a solution of 60 % ethanol by volume. What volume of alcohol should be added to make a 200 mL of this solution?
Answer: 120 mL of ethanol must be added.
Explanation:
We are given:
60% ethanol by volume
This means that 60 mL of ethanol is present in 100 mL of solution
Given volume of solution = 200 mL
Applying unitary method:
If 100 mL of solution contains 60 mL of ethanol
So, 200 mL of solution will contain = [tex]\frac{60}{100}\times 200=120mL[/tex] of ethanol
Hence, 120 mL of ethanol must be added.
Solve the given problems showing all work for each. 1. Calculate the molar mass/formula mass of ammonium sulfate -- (NH4)2SO4 , The atomic mass of Nitrogen (N) = 14.0, Sulfur (S) = 32.1, Hydrogen (H) = 1.0, & Oxygen (O) = 16.0 *
Answer:
The molar mass of ammonium sulfate, (NH₄)₂SO₄ = 132.1 g
Explanation:
The molar mass of a compound is the mass of 1 mole of the given substance.
For a compound the molar mass of the compound is obtained by summing the product of the number of atoms and the atomic masses of the atoms present in the compound.
To calculate the molar mass of ammonium sulfate, (NH₄)₂SO₄:
Atomic masses of the elements are as follows; Nitrogen (N) = 14.0, Sulfur (S) = 32.1, Hydrogen (H) = 1.0, & Oxygen (O) = 16.0
Mass of Nitrogen present = 14.0 × 2 = 28.0 g
Mass of hydrogen present = 1.0 × 4 × 2 = 8.0 g
Mass of sulfur present = 32.1 × 1 = 32.1 g
Mass of oxygen present = 16.0 × 4 = 64.0 g
Molar mass of ammonium sulfate, (NH₄)₂SO₄ = (28.0 + 8.0 + 32.1 + 64.0) g = 132.1 g
Therefore, the molar mass of ammonium sulfate, (NH₄)₂SO₄ = 132.1 g
Which are characteristics of electromagnetic waves? Check all that apply.
Answer:
Electromagnetic waves are typically described by any of the following three physical properties: frequency (f), wavelength (λ), or intensity (I). Light quanta are typically described by frequency (f), wavelength (λ), or photon energy (E). The spectrum can be ordered according to frequency or wavelength.
Match each element or compound with the appropriate symbol or molecular formula. Carbon dioxide CO2 carbon o oxygen Н H water с hydrogen H2O
Answer:
Carbon dioxide ---> CO₂
Water ----> H₂O
Carbon ---> C
Oxygen ----> O₂
Hydrogen ----> H₂
Explanation:
The molecular formula of an element or compound is a formula which represents the composition of a molecule of that element or compound. It consists of the formula representing the atoms present as well as the number of atoms of each element innthe compound written as subscript innthe formula of the element or compound.
The molecular formula of the given elements and compounds are given below:
Carbon dioxide ---> CO₂
Water ----> H₂O
Carbon ---> C
Oxygen ----> O₂
Hydrogen ----> H₂
The molecular formula of carbon dioxide shows that in a molecule of carbon dioxide, there are two atoms of oxygen and one atom of carbon present in a molecule of carbon dioxide.
The molecular formula of water shows that are two atoms of hydrogen and one atom of oxygen present in a molecule of water.
The molecular formula of carbon shows that there are one carbon atoms in a molecule of carbon.
The molecular formula of oxygen shows that there are two oxygen atoms in a molecule of oxygen gas.
The molecular formula of hydrogen shows that there are two molecules of hydrogen in a molecule of hydrogen gas.