Answer: The answer would be A;They measure the amount of greenhouse gases in the atmosphere, and the temperature over many years.
Explanation: If scientists only went off of clouds, they'd only be able to tell if it is about to rain. If they only observed the oceans, they'd only be able to tell when a tornado or tsunami was about to occur.
Answer: The answer is A. Thay measure the amount of greenhous gases in the atmosphere and the temperature over many years
Explanation:
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
A. Argon
B. Xenon
C. Helium
D. Krypton
The gases used in different types of welding would include
A. oxygen and hydrogen
B. oxygen, hydrogen, acetylene and nitrogen
C. oxygen, acetylene and argon
D. oxygen and acetylene
The property of a substance to absorb moisture from the air on exposure is called
A. osmosis
B. deliquescence
C. efflorescence
D. desiccation
In which of the following activities silicon carbide is used?
A. Making cement and glass
B. Disinfecting water of ponds
C. cutting very hard substances
D. Making casts for statues
The average salinity of sea water is
A. 3%
B. 3.5%
C. 2.5%
D. 2%
Answer:
1. C. helium
2. D. oxygen and acetylene
3. B. deliquescence
4. C. cutting very hard surfaces
5. B. 3.5%
Explanation:
Determine the volume in liters of a 1.00 ounce bottle. (1.06 qt. = 1 L; 32 ounces= 1 qt)
A 1.00-ounce bottle holds approximately 0.0295 liters of liquid, by converting ounces to quarts (1.00 ounce / 32 ounces), and then quarts to liters (the resulting number of quarts / 1.06).
Explanation:Given that there are 32 ounces in 1 quart and 1.06 quarts in 1 liter, we can first convert ounces to quarts, and then quarts to liters. So, if we have 1.00 ounce, we simply divide this number by 32 to get the equivalent in quarts. The answer is about 0.03125 quarts. Then, we convert quarts to liters by dividing the number of quarts obtained by 1.06, yielding approximately 0.0295 liters.
Thus, a 1.00-ounce bottle would hold about 0.0295 liters of liquid.
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Calculate the hydrogen ion concentration for an aqueous solution that has a pH of 3.45.
Answer:
[H⁺] = 3.548 x 10⁻⁴ M.
Explanation:
∵ pH = -log[H⁺]
∴ 3.45 = -log[H⁺]
log[H⁺] = -3.45
∴ [H⁺] = 3.548 x 10⁻⁴ M.
To find the hydrogen ion concentration from a pH of 3.45, calculate 10 to the power of negative pH, resulting in a hydronium ion concentration of approximately 3.55 × 10-4 M.
Explanation:To calculate the hydrogen ion concentration for an aqueous solution with a pH of 3.45, we can use the definition of pH which is pH = -log[H3O+]. We need to reverse the process to find the concentration of hydronium ions (H3O+). This is done by taking the antilog (inverse log) of the negative pH value.
First, we reverse the sign of the pH to get -3.45. Using a calculator, we enter -3.45 and then press the 10x or exp button to find the concentration of H3O+. The result is that [H3O+] = 10-3.45 M, which calculates to approximately 3.55 × 10-4 M.
if you supply 3600 kJ of heat, how many grams of ice at 0°C can be melted, heated to its boiling point? (Make M your X in equations) (figure out which q you need)
Answer:
=1.36kg
Explanation:
First heat is absorbed to melt the ice- latent heat of fusion of ice then heat is absorbed to raise the temperature to 373K
The specific heat capacity of water is 4.187kJ/kg/K while the latent heat of fusion of ice is 2230kJ/kg/K.
Letting the mass of the ice to be =x
x×2230kJ/kg/K + x×4.187kJ/kg/K×100K= 3600kJ
2230x+418.7x=3600
2647.8x=3600
x=1.36 kg
Can someone plz explain ionic and covalent bonding plzzzz!!!
Answer:
Ionic Bonding: The formation of an Ionic bond is the result of the transfer of one or more electrons from a metal onto a non-metal.
Covalent Bonding: Bonding between non-metals consists of two electrons shared between two atoms.
Explanation:
Neutralization of HCl and NaOH
Answer:
the reaction with the hydrochloric acid and the sodium hydroxide gives you HCl + NaOH which gives you H2O + NaCl.
Explanation:
Balance the chemical equation. Balancing the neutralization reaction involves the process of making sure that there is an equal number of moles of each of the elements on both sides of the equation.
Which is not a strong electrolyte?
Some bases
Water
Some acids
Salts
Answer:
Water
Explanation:
Strong electrolytes will completely ionize in water, and water cannot do that to itself.
which is not a strong electrolyte?
water
A temperature change in a reaction indicates_____.
A temperature change in a reaction indicates a chemical change
A temperature change in a reaction indicates occurrence of chemical change.
Explanation:In chemistry, two types of reaction are always witnessed. One is physical reaction whereas the other is chemical reaction. In a chemical reaction, there is an adjustment in the organization of the substances whereas in a physical change there is a distinction in the appearance, smell, or straightforward showcase of an example of issue without an adjustment in structure.
At the point when bonds are broken and new ones are shaped, a compound change happens. The following happenings indicate the chemical change:
Change in Temperature Change in Color Recognizable Odor Development of a Precipitate or bubblesWhat volume in mt, of 0.5a M1HCI solution is needed to neutralize 77 ml of 1.54 M NaOH solution?
Answer:
237.2 mL.
Explanation:
We have the rule: at neutralization, the no. of millimoles of acid is equal to the no. of millimoles of the base.(XMV) acid = (XMV) base.
where, X is the no. of (H) or (OH) reproducible in acid or base, respectively.
M is the molarity of the acid or base.
V is the volume of the acid or base.
(XMV) HCl = (XMV) NaOH.
For HCl; X = 1, M = 0.5 M, V = ??? mL.
For NaOH, X = 1, M = 1.54 M, V = 77.0 mL.
∴ V of HCl = (XMV) NaOH / (XV) HCl = (1)(1.54 M)(77.0 mL) / (1)(0.5 M) = 237.2 mL.
What are the missing pieces of the nuclear equation above? You will need to determine the
missing parts for this transmutation. You will need to determine what numbers should be
substituted for A and Z, and you will need to determine what should be substituted for X.
Answer:
The missing pieces of the nuclear equation are:
A = 6Z = 3X = LiExplanation:
1) Given nuclear reaction:
[tex]^9_4Be+^1_1H->^A_ZX+^4_2He[/tex]
2) A: mass number:
Balance the mass numbers of both sides of the nuclear reaction.
The mass number is the superscript to the left of the chemical symbol:
9 + 1 = A + 4 ⇒ A = 10 - 4 = 63) Z: atomic number
Balance the atomic numbers of both sides of the nuclear reaction
The atomic number is the subscript to the left of the chemical symbol:
4 + 1 = Z + 2 ⇒ Z = 5 - 2 = 34) Identity of the element.
The atomic number, which is the number of protons, identifies the unknown element: X.
You can find this information in a periodic table.
The element with atomic number 3 is lithium, and its chemical symbol is Li, hence X = Li.
A scientist wants to use a model to help present the results of his detailed scientific investigation.
Why would a model be useful?
because the model makes the concepts easier to understand
because the model is easy to put together and to use
because the model prevents other scientists from asking questions
because the model requires the audience to pay full attention to it
Because the model makes the concepts easier to understand.
Answer:
A. because the model makes the concepts easier to understand
Edge.2023
Explanation:
<3
What’s the charge of cu3PO4
Answer:No charge
Explanation:
Cu3PO4 is an ionic compound which my definition has no charge (or a charge of 0). But if you are referring to the ions themselves that make up the compound, PO4 is a polyatomic ion so you can look up its charge in a polyatomic ion chart (it is 3-). Thus since there are 3 Cu's per PO4^3-, each Cu must have a charge of 1+.
The charge of Cu3PO4 is neutral, and each Cu ion in the molecule carries a +1 charge to balance the -3 charge from the phosphate ion.
Explanation:The compound Cu3PO4 is made up of Cu (Copper) and PO4 (Phosphate) ions. When these ions bind to form an ionic compound such as Cu3PO4, the total charge of the compound should be neutral.
The charge of Cu3(PO4)2 is +2.
In this case, phosphate has a charge of -3, and for the molecule to be neutral, the total charge from the 3 Copper ions must be +3, making the charge of each Cu (Copper) ion as +1.
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Consider this reaction:
N2 (g) + 3H2 (g) 2NH3 (g)
What will happen if more hydrogen gas is added to the reaction mixture?
A.
There will be a shift toward the products.
B.
There will be a shift toward the reactants.
C.
There will not be a shift in equilibrium.
D.
The value for Keq will change.
The answer is B :))))
If more hydrogen gas is added to the reaction mixture, there will be a shift toward the reactants. Therefore, the correct option is option B.
What is Le Chatelier's principle?Le Chatelier's principle, sometimes referred as Chatelier's concept, is indeed a chemical concept that predicts how changes in conditions would impact chemical equilibria. The idea is named for Karl Ferdinand Braun and, on occasion, French scientist Pierre Louis Le Chatelier, who independently discovered it.
When a concentration, temperature, volume, or pressure increase is applied to a simple system in thermodynamic equilibrium, it moves to a new equilibrium. The earlier alteration is somewhat cancelled out by this new equilibrium. If more hydrogen gas is added to the reaction mixture, there will be a shift toward the reactants.
Therefore, the correct option is option B.
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(08.04 MC)
Which of the following statements best predicts the pH value of NH3 and KOH?
Both have a pH less than 7, but NH3 has a higher pH than KOH.
Both have a pH greater than 7, but NH3 has a lower pH than KOH.
O NH3 has a pH less than 7, and KOH has a pH greater than 7.
O NH3 has a pH greater than 7, and KOH has a pH less than 7.
Question 2 Multiple Choice Worth 1 points)
Answer:
Both have a pH greater than 7, but NH₃ has a lower pH than KOH.
Explanation:
Both of NH₃ and KOH are bases (can produce OH⁻), so both have a pH greater than 7.NH₃ is considered as a weak base (not completely ionized), while KOH is a strong base (completely ionized).If both NH₃ an KOH has the same concentration, KOH produces OH⁻ higher than that of NH₃.So, NH₃ has a lower pH than KOH.Thus the right choice is:
Both have a pH greater than 7, but NH₃ has a lower pH than KOH.
Answer: B) Both have a pH greater than 7, but NH3 has a lower pH than KOH.
A gas in a rigid container at 25C has a pressure of .96atm. A change in temperature causes the pressure to increase to 1.25 atm. What is the new temperature of the gas
The answer is:
The new temperature of the gas is equal to 388.22 K
Why?Since we have a rigid container, we can safely assume that the volume is kept constant.
To solve the problem, we need to use the Gay Lussac's Law, which states that the pressure and the volume of an ideal gas are proportional when the volume is kept constant.
Also, we need to remember that Gay Lussac's Law works with absolute temperature, so, we need to convert the given temperature (in celsius degrees) to Kelvin.
[tex]T(K)=273.15 + T(\°C)\\\\T(K)=273.15 +25=298.15K[/tex]
So, using the Gay Lussac's equation, we have:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Where,
[tex]P_1[/tex] is equal to the first pressure.
[tex]T_1[/tex] is equal to the first temperature.
[tex]P_2[/tex] is equal to the new pressure.
[tex]T_2[/tex] is equal to the new temperature.
We are given the following information:
[tex]P_1=0.96atm[/tex]
[tex]T_1=298.15K[/tex]
[tex]P_2=1.25atm[/tex]
Then, substituting and calculating, we have:
[tex]T_2=P_2*\frac{T_1}{P_1}\\\\T_2=1.25atm*\frac{298.15K}{0.96atm}=388.22K[/tex]
Hence, the new temperature of the gas is equal to 388.22 K.
Have a nice day!
Answer: the person up there had the correct answers so far, but didn’t complete it, but after converting it , finish it .
temperature in celcius - 388 K - 273 = 115 °C
answer is C. 115 °C
Which statement about concentration cells is correct?
A.
Concentration cells have different electrodes.
B.
Concentration cells have different solutions but with the same concentration level.
C.
Concentration cells have high voltages when the concentration levels are the same.
D.
Concentration cells have the same substance for both anode and cathode.
Answer:
Concentration cells have the same substance for both anode and cathode.
Explanation:
Plato
The correct statement about concentration cell is concentration cells have the same substance for both anode and cathode. The correct option is D.
What is anode and cathode in a cell?Anode is the negative terminal of the cell in which the electrons are released or reduced.
The cathode is the positive terminal where the electrons are accepted, here oxidation occurs.
Thus, the correct option is D. Concentration cells have the same substance for both anode and cathode.
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(Multiple choice) Which actions are part of the dissolution process of an ionic solute in water?
The ions are pushed together to form molecules.
Each ion is surrounded by water molecules.
The water molecules attract some ions and repel others.
The ions in the solute separate from each other.
The water molecules break apart into ions.
Answer: Each ion is surrounded by water molecules
Explanation: The ions are surround by the water molecules which act as a barrier around the ions and prevent the recombination of ions. The ions are said to be hydrated.
Answer:
Each ion is surrounded by water molecules.
Explanation:
During dissolution of ionic solute in water the following process occur
a) Breaking of molecule into separate ions (need lattice energy)
b) hydration of each ion by water molecules (hydration energy is released)
c) due to hydration the ions of solutes further become far from each other.
There is no breaking of water molecule or the ions do not combine to form molecule.
what is matter and energy
Answer:
Matter is something that is made of atoms like a liquid, solid, or gas and energy is when water becomes a gas and the energy starts to get faster to where there is steam because the gas is being trapped inside the pot or any other object.
Explanation:
At 40.0°C, the pressure inside a nitrogen-filled tennis ball with a volume of 148
cm is 235 kPa. How many moles of nitrogen (N2) are in the tennis ball?
A 13.4 mol
B 4.22 * 102 mol
C 1.34 x 10-2 mol
OD 0.105 mol
Answer:
the answer is
n = 0.01336 mol
Explanation:
To determine the number of moles of a gas, we need to have an expression that relates the pressure, temperature and volume of the system. For simplification, we assume that this gas is ideal so we use the equation PV=nRT. We calculate as follows:
PV=nRT
n = PV / RT
n = 235000(1.48x10^-4) / (8.314)(40+273.15)
n = 0.01336 mol
Answer : The correct option is, (B) [tex]1.34\times 10^2mol[/tex]
Explanation :
To calculate the moles of nitrogen gas we are using ideal gas equation:
[tex]PV=nRT[/tex]
where,
P = pressure of nitrogen gas = 235 kPa = 2.319 atm
Conversion used : (1 atm = 101.325 kPa)
V = volume of nitrogen gas = [tex]148cm^3=148mL=0.148L[/tex]
Conversion used : (1 L= 1000 mL)
T = temperature of nitrogen gas = [tex]40.0^oC=273+40.0=313K[/tex]
R = gas constant = 0.0821 L.atm/mole.K
n = moles of nitrogen gas = ?
Now put all the given values in the ideal gas equation, we get:
[tex](2.319atm)\times (0.148L)=n\times (0.0821L.atm/mole.K)\times (313K)[/tex]
[tex]n=0.0134mol=1.34\times 10^2mol[/tex]
Therefore, the number of moles of nitrogen gas are, [tex]1.34\times 10^2mol[/tex]
Which statement about concentration cells is correct?
A.
The concentrations are the same and the reactions are the same, so the cell potential is 0.00 volts.
B.
The concentrations are the same and the reactions are different, so the cell potential is greater than 0.00 volts.
C.
The concentrations are the same and the reactions are different, so the cell potential is less than 0.00 volts.
D.
The concentrations are different and the reactions are different, so the cell potential is 0.00 volts.
Final answer:
The correct statement is that in a concentration cell, the reactions are the same but the concentrations are different, which results in a cell potential greater than 0.00 volts until equilibration.
Explanation:
The correct statement about concentration cells is: The concentrations are different and the reactions are the same, so the cell potential is not 0.00 volts. Essentially, concentration cells consist of two half-cells with identical electrodes and the same redox active species at different concentrations. The standard electrode potential (E°) in a concentration cell is zero because the electrodes are identical; however, there is a potential difference, calculated with the Nernst Equation, due to varying concentrations. As the reaction in a concentration cell proceeds, the concentrations equilibrate and the cell potential (ΔEcell) decreases until the concentrations become equal and ΔEcell reaches zero.
Which type of fire should never be put out with water?
paper fire
clothing fire
wood fire
grease fire
Answer:
grease fire. The others are solids that will easily be put out with water.
Answer:
grease fire
Explanation:
DOING THAT WILL JUST MAKE IT WORSE
hope it helps
After a party, a room is known to have high entropy and thus is a good example of which law?
the zeroth law of thermodynamics
the first law of thermodynamics
the law of conservation of energy
the second law of thermodynamics
the second law of thermodynamics
Chlorine gas react with potassium bromide. Predict the products of this reaction and their states.
Give an explanation for you answer.
can someone please explain how I get to an answer please
Answer:
See below.
Explanation:
Chlorine gas replaces the bromine in potassium bromide to form potassium chloride and bromine liquid is released.
The equation for the reaction is:
Cl2 (g) + 2KBr (s) = KCl (s) + Br2 (l).
This reaction occurs because chlorine is more reactive then bromine.
Engineers increase output in crop production by combining the strengths of
two plants. This can be done by using one plant to pollinate a different plant
so that their strengths are combined into a new plant. What is this technique
called?
Answer:
Cross-pollination
Explanation:
This technique is used to create new varieties, usually with stronger characteristics than the two original varieties. When the pollen of one variety is placed to a different plant's stigma, the resulting seeds create a new variety. This cross-pollination is used in plants of the same species.
Answer:
Crossbreeding
Explanation:
apex
_______________ reactions transfer energy to the surroundings, usually as heat. A) Decomposition B) Endothermic C) Exothermic D) Synthesis
Answer: C EXOTHERMIC
Explanation:
Answer: C
Explanation:
Which chemical equation is balanced? This is timed, please help!
Answer: It's the first one,
In what zone of the ocean are thermal vents found? How are they related to organisms in this zone?
the very bottom of the ocean and they are relevant by most of the animals feed off of the animals that come out of he vents
which of these energy
resource is non rewnable?
Nonrenewable resources are those found inside the earth, and they took millions of years to form. These include the fossil fuels, oil, natural gas, and coal and nuclear energy
which of the following natural resources does not contribute to global warming
coal
natural gas
nuclear power
oil
Answer:
The right choice is "nuclear power "
Explanation:
Human activities like burning coal for warming or for using in industries, heat our homes with oil, or switching on our natural gas stoves for cooking produce carbon dioxide gas and other gases (i.e. greenhouse gas) responsible for global warming .
while, nuclear power doesn't contribute to the universe with any of this greenhouse gas
So, the right choice is "nuclear power "
PLEASE ITS URGENT! If some electrons are transferred from object A to object B,
A. Object A will have a positive charge
B. Object A will have a negative charge
C. Object B will have a positive charge
D. B and C
Object A will have a positive charge since it is losing electrons. And object B would have a negative charge since its gaining electrons. For example, magnesium atom is object A and chloride atom is object B. Magnesium atom gives an electron away to the chloride atom. Therefore the chloride atom will have a negative charge of one and magnesium has a positive charge of 1.
The answer is A. Object A will have a positive charge.