:
alkali metals will
does energy transfer always result in phase change
These energy exchanges are not changes in kinetic energy. They are changes in bonding energy between the molecules. "If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance.
BRAINLIEST!!!HELPPPP MEEEE!!!
A researcher investigates the solubility of a new compound in water. Which action would best validate the data collected for the solubility of the new compound?
repeatedly testing the solubility at various temperatures
having a science expert measure the solubility
measuring the solubility of other substances
studying other properties of the compound
Answer:
I think the answer is A) repeatedly testing the solubility at various temperatures
Explanation:
Help would be greatly appreciated, thank you!! :) What is the relationship between Pressure (P) and Volume (V)?
1. Inversely proportional
2. Directly proportional
3. There is no relationship
how much energy would be lost by 23 g of water if it was heated until it was 78 degrees celsius and then allow to cool down to 27 degrees celsius
Answer:
Q = -4903.14 j
Explanation:
Given data:
Mass of water = 23 g
Initial temperature = 78°C
Final temperature = 27°C
Heat lost = ?
Solution:
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 27°C - 78°C
ΔT = -51°C
Q = 23 g × 4.18 J/g.°C × -51°C
Q = -4903.14 j (negative sign shows heat is released)
Compare the amount of copper predicted in part A with the amount measured in part B. What percentage of the predicted amount was obtained? Why aren’t these values the same?
Answer:
Explanation:
Because the experiment has an different independent and dependent variable and each part has a different result of what type of copper or what type of control you are using for you experiment.
PLS MARK BRAINLIEST IF CORRECT I WORKED HARD ON THIS ANSWER,HAVE A NICE DAY/NIGHT <3
Answer:
Because the experiment has a different independent and dependent variable and each part has a different result of what type of copper or what type of control you are using for your experiment.
What type of chemical reaction is 6, 7 and 8
Answer:
Explanation:
Types of Chemical Reactions - Double Displacement Reactions.
Help me balance the equation
Answer:
blank 1 ----> 1
blank 2 -----> 1
blank 3 ------> 3
Explanation:
easy one!
How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm
and 25°C? C°C +273 = °K) (R=0.0821 L.atm/mol-K)
We are given:_______________________________________________
Volume of Gas (V) = 2.5L
Pressure (P) = 1.2 atm
Temperature (T) = 25°C OR 25+273 = 298 K
Universal Gravitational Constant (R) = 0.0821
Solving for number of moles:___________________________________
From the Ideal Gas Equation,
PV = nRT
(1.2)(2.5) = n(0.0821)(298) [plugging the given values]
n = [(1.2)(2.5)] / [0.0821*298]
n = 300 / [298*8.21]
n = 0.12 moles
Hence, there are 0.12 moles of Oxygen in 2.5L of 1.2 atm gas when the temperature is 25°C
3. Hydrogen gas was cooled from 150°C to 50 °C. Its new volume is 75.0mL.
What was its original volume?
Answer:98
Explanation:X/423 = 75.0/323 X = 98
Considering the Charles' Law, the original volume is 98.22 mL.
Charles' LawCharles' Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure.
This law states that for a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of movement that they have. the gas molecules. That is, the volume is directly proportional to the temperature of the gas.
Mathematically, Charles' law states that the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T}=k[/tex]
Considering an initial state 1 and a final state 2, the following is true:
[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]
Original volume in this caseIn this case, you know:
V1= ?T1= 150 °C= 423 K (being 0 °C= 273 K)V2= 75 mLT2= 50 °C= 323 KReplacing in Charles's law:
[tex]\frac{V1}{423 K}=\frac{75 mL}{323 K}[/tex]
Solving:
[tex]V1=\frac{75 mL}{323 K}423 K[/tex]
V1= 98.22 mL
In summary, the original volume is 98.22 mL.
Learn more about Charles's law:
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which element has very high reactivity , very good electrical conductivity , and good malleability
Answer: radiation
Explanation: im not sure so dont take my word fot it
29.
How many seconds would it take for the total pressure to be 0.7133 atm?
Predict the outcome of this reaction. Balancing doesn't matter.
Mg + H2O -->
Answer:
MgO + H₂
Explanation:
The products of reaction is MgO and hydrogen gas.
This is a single displacement reaction.
In this reaction, the possibility of the reaction is determined by position of the atoms on the activity series.
Mg is higher than H on the activity series, so it is more reactive and it then displaces the hydrogen in water;
Mg + H₂O → MgO + H₂
8. Fill in the blanks underneath the wave spectrum to indicate the relative positions of each type of
electromagnetic radiation from the given word bank.
gamma
ultraviolet
visible
X-rays
microwaves
infrared
radio/tv
wwwwww
annu
WNNNNN
The order of the radiations from longer wavelength to shorter wavelength is as follows: Radio waves , microwave, infrared, visible light, ultraviolet, X-rays and gamma rays. In these order the blanks have to be filled.
What is electromagnetic spectrum?Electromagnetic spectrum is the arrangement of radiations in the order of decreasing wavelength or increasing frequency. Frequency is the number of wave cycles per unit time.
All the electromagnetic radiations are transverse waves. Wavelength of an electromagnetic radiation is the distance between two consecutive crests or troughs or the waves.
As the wavelength increases frequency and energy of electromagnetic radiations decreases. The longest wave is radio waves.Shortest wave is gamma rays.
The given image of wave is from longer wavelength to shorter wavelength hence the radiations can be arranged as : Radio waves , microwave, infrared, visible light, ultraviolet, X-rays and gamma rays.
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is acid rain corroding a statue an example of physical weathering
Answer:
Acid rain's effect on stone is a chemical change.
Explanation:
Acid rain has hydrochloric acid which reacts with the calcium carbonate in the stone.
I hope this helps. (Sorry if i am wrong)
4 NH3 + 5 O2 - 4 NO + 6 H20
Given 20 moles of O2 and 14 moles of NH3, which would act as the limiting reactant?
NH₃ as the limiting reactant
Further explanationGiven
Reaction
4 NH3 + 5 O2 ⇒ 4 NO + 6 H20
Required
The limiting reactant
Solution
To find the limiting of the reactants, we can use the method by dividing the moles of each reactant by the reaction coefficient. The smallest ratio will be the limiting reactants
the mol ratio of NH₃ : O₂ =
=14/4 : 20/5
= 3.5 : 4
So NH₃ as the limiting reactant
what produces carbon dioxide?
nitrogen gas expands isothermally from 10cm3 to 25 cm3 the initial pressure is 2.0 x 105 Pa
Hans observed properties of four different waves and recorded observations about each one in his chart.
A 2-column table with 4 rows. The first column labeled Wave has entries W, X, Y, Z. The second column labeled Observations has entries scatters through a small opening to form a ray of light, bounces off a mirror, changes colors as it passes through a crystal, bends as it passes through an object.
Which statement is best supported by the table?
Wave W is being reflected, Wave X is being refracted, and waves Y and Z are being diffracted.
Wave X is being diffracted, Wave Z is being reflected, and waves Y and W are being refracted.
Wave X is being reflected, Wave Z is being refracted, and waves Y and W are being diffracted.
Wave W is being diffracted, Wave X is being reflected, and waves Y and Z are being refracted.
Answer/Explanation:
Wave W is being diffracted, Wave X is being reflected, and waves Y and Z are being refracted.
IF CORRECT ILL GIVE BRAINLIEST
all the drop boxes say compound & element. pick either or for each one.
Answer:
Hydrogen = element
Carbon dioxide = compound
Water = compound
Zinc = element
Nitrogen = element
Salt = compound
Helium = element
Carbon monoxide = compound
Explanation:
An element and a compound are different when it comes to the types of atoms they possess. An element has only one type of atom while a compound has two types of atoms. For example, Hydrogen is an element because it has two atoms of the same type and that is, the "Hydrogen atom."
On the contrary, Carbon dioxide has one carbon atom and two atoms for Oxygen. Therefore, it is a compound because it has two types of atoms: Carbon atom and Oxygen atom.
Water has two atoms of Hydrogen and one atom of Oxygen. Therefore, it is a compound because it has two types of atoms: Hydrogen atom and Oxygen atom.
Find the empirical formula for a compound with 92.25 % Cand 7.75 % H.
Please help. I’m really struggling. No wrong answers please, if you don’t know it please don’t answer, I’m already failing the class.
Answer:CH
Explanation:it’s simply has the answer in the question. It’s just throwing you off with the percentages.
Many geologic features are associated with various plate boundaries. Select each
plate boundary associated with a trench.
Oceanic-Oceanic Convergence
Hot Spot
Divergent Boundary
Oceanic-Continental Convergence
Continental-Continental Convergence
Answer:
subduction zone
Island Arc volcanoes
earthquakes
PLZZZ I NEED HELP THIS IS DUE AT 4:00 PM
Shane can run the length of a football field (100 yards) in 12 seconds. What is Shane’s speed?
Answer:
speed = distance/time
100 yards =91.5 metres
=91.5/12=7.625m/s
Answer:
17.05 MPH or 7.62 MPS
Explanation: I am not sure what one you are wanting, either in miles per hour or meters per second
Calculate the mass of 4.60 x 10^25 atoms of neon?
Select one:
a. 0.264 g
b. 5.54 x 10^2 g
c. 1.54 x 10^3 g
d. 0.0382 g
1.54 x [tex]10^3[/tex] g is the mass of 4.60 x [tex]10^{25}[/tex] atoms of neon.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
1 mol of atoms = 6.02214076 × [tex]10^{23}[/tex]
Moles of neon in 4.60 x [tex]10^{25}[/tex] atoms = [tex]\frac{mass}{molar \;mass}[/tex]
[tex]\frac{4.60 X 10^{25}}{ 6.02214076 X 10^{23}}[/tex]
0.7638479709 = 76.38 mol
The molar mass of neon is 20 g/mol
76.38 mol x 20 g/mol
1.54 x [tex]10^3[/tex] g
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What is the best description of the role of decomposers in the carbon cycle?
They release the carbon that remains in the bodies of dead organisms.
They absorb carbon from carbon dioxide in the atmosphere.
They change carbon dioxide into a form that organisms can use.
They prevent carbon from escaping into the atmosphere.
Answer:
A
Explanation:
I got done taking the quiz If I could Show U I would but the answer is a
Answer:
The answer is "They release the carbon that remains in the bodies of dead organisms.".
Explanation:
In which part of the plant does photosynthesis occur?
Answer:
Photosynthesis takes place in the chloroplasts of the plant!!
Explanation:
I hope this helps!
Answer:
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
Explanation: oh oh i know this!!!!
need to turn this in, in 10
mins please what’s the answer...thank you
Answer:
21 oxygen atoms
Explanation:
I think it is 7 but i am not sure
Explanation:
The class of drug that increases the activity of the central nervous system is known as:
A. stimulants
B. narcotics
C. hallucinogens
D. depressants
Answer:
A. stimulants
Explanation:
Group 17 is called the halogen family, and the group to its right is called the noble gases. How are the elements in these groups alike and how are they different?
Answer: they all have 7 electrons they have different atom sizes
Explanation: hope it helps
The molecular formula for the structure show below is:
1. CF
2. CF2
3. CF3
4. CF4
Answer:
CF₄
Explanation:
The molecular formula of the structure shown by the representation is given as:
CF₄
The central atom is C and it is surrounded by 4 atoms of Fluorine.
This structure exhibits covalent bonding between the atoms. To attain a complete octet, the carbon and fluorine share electrons. This sharing of electrons makes them isoelectronic with corresponding noble gases.The process of DNA copying itself begins when the two sides of the DNA molecule unwind and separate. True or False
Answer: False
Explanation: False. Replication. The process of DNA copying itself begins when the two sides of the DNA molecule unwind and " separate ".