Answer:
D
Explanation:
True or false a surface wave moves the medium in the same direction as the wave travels
Answer:
true I just guessed of I'm being honest
Please help with my chemistry! PLEASE
Answer:
b.
Explanation:
Americium decays to neptunium 237.
An alpha particle has 2 protons and 2 neutrons, so 4 helium atoms.
241-4=237
Calculate the amount of heat released when the bottle (250g) of water is cooled from 30°C to 25°C. The specific heat of water is 4.186J/g Degree Celsius
Answer:
5232.5J
Explanation:
Data obtained from the question. This includes the following:
Mass (M) = 250g
Initial temperature (T1) = 30°C
Final temperature (T2) = 25°C
Change in temperature (ΔT) = T1 – T2 = 30°C – 25°C = 5°C
Specific heat capacity (C) = 4.186J/g°C
Heat (Q) =.?
The heat released can be obtained as follow:
Q = MCΔT
Q = 250 x 4.186 x 5
Q = 5232.5J
Therefore, the heat released is 5232.5J
The amount of heat released when the bottle (250g) of water is cooled is 5232.5J .
Given data:-
Mass (M) = 250g
Initial temperature (T1) = 30°C
Final temperature (T2) = 25°C
Change in temperature (ΔT) = T1 – T2 = 30°C – 25°C = 5°C
Specific heat capacity (C) = 4.186J/g°C
Heat (Q) =.?
The heat released can be obtained as follow:
[tex]Q = MC\delta T\\\\Q = 250\times 4.186 \times 5\\\\Q = 5232.5J[/tex]
Therefore, the heat released is 5232.5J.
To know more about:-
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What is the charge on an electron?
Answer:
The answer is negative .
What are the four main parts of the Sun? *
Answer: The inner layers are core, radiative zone, and convective zone. The putter layers a photosphere, the chromosphere, the transition region and the corona
Is the same reactant always the limiting reactant?
Help Chem asap!!!!! Brainslist
Answer:
OH-
Explanation:
If 14 moles of Oxygen burn how many moles of water are created? *
2C2H6
+
702
4CO2 + 6 H2O
A) 12 mol H20
B) 3.5 mol H20
C) 3 mol H20
D) 42 mol H20
Answer:
A) 12 mol H2O.
Explanation:
Hello,
In this case, for the given reaction:
[tex]2C_2H_6+7O_2\rightarrow 4CO_2 + 6 H_2O[/tex]
We notice that oxygen is in a 7:6 molar relationship with water, for that reason, the resulting moles of water turn out:
[tex]n_{H_2O}=14molO_2*\frac{6molH_2O}{7molO_2} \\\\n_{H_2O}=12molH_2O[/tex]
Thus, the answer is A) 12 mol H2O.
Best regards.
Why might you have difficulty determining the pH of bleach using ph strips?
Answer:
pH test strips will lose colour and their pH sensitivity as strips are made from universal indicator. Universal indicator is composed of phenolphthalein, methyl red, methyl orange and thymol blue.
Explanation:
pH test strips are made from the universal indicator. The universal indicator is composed of phenolphthalein, methyl red, methyl orange, and thymol blue. All of these will react with chlorine in bleach. As a result, they will lose color and pH sensitivity. Due to this, it is difficult to determine the pH of bleach using ph strips.
A redox reaction is set up so that both half reactions take place in separate beakers that are connected by a salt bridge and a wire. A path for the transfer of ions is provided by the? (1) anode (2) cathode (3) salt bridge (4) wire
Answer:
Salt bridge
Explanation:
Salt bridge is used in an electrolytic cell to transfer electrons from the anode to the cathode.
Salt bridge are used because they do not interfere with the constituents of the cell I.e the anode (+very electrode) and cathode(-ve electrode).
Examples of salt bridges are AgNO₃, KCl etc.
Salt bridge can be described as a tool used to link the oxidation half cell and reduction half cell in an electrolytic set-up or galvanic cell.
If we start with 1.000g of strontium 90 0.953 grams will remain after 2.0 years (a) what is the half life of strontium 90 (b) how much strontium 90 will remain after 5.00 years Please show the necessary step
Answer:
a) 29.0 years
b) 0.89 g
Explanation:
Using the formula
t1/2= t×ln2/ln(No/Nt)
Where
Nt= mass of radioactive isotope at time= t =0.953g
No= initial mass of radioactive isotope present= 1.000g
t= time taken for N mass of radioactive isotope to remain = 2 years
t1/2 = half-life of radioactive isotope= ???
Substituting the values
t1/2= 2 × ln2/ln(1.000/0.953)
t1/2= 2× 0.693/0.048
t1/2= 29 hours
b)
N= No(1/2)^t/t1/2
Where t= 5 years
N= 1.000(1/2)^5/29
N= 1.000(1/2)^0.17
N= 0.89g
What is the compounds of AICI3 and H+
Answer:
Aluminium Chloride and Hyrdron, also known as proton/
Explanation:
Calculate the molar mass of ammonium chloride
Answer:
53.491 g/mol
Explanation:
Create the chemical compound and find each individual element's molar mass. Lastly, add them up.
Will a reaction occur in KCl +Br2= KBr + Cl2
Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4?
A. 1.15 × 10^23
B. 1.84 × 10^24
C. 4.61 × 10^23
D. 7.87 × 10^23
Answer:
B. 1.84 × 10^24
Explanation:
[tex]75.0 g H2SO4(\frac{1 mol H2SO4}{98.1 g})(\frac{4 mol O}{1 mol H2SO4})(\frac{6.023 x 10^23 atoms}{1 mol O} )[/tex] = 1.84 x 10^24 atoms
How is the atmospheric oxygen that is taken in by living things for respiration replaced?
A) After living things use oxygen for respiration, they exhale the oxygen back to the atmosphere.
B) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
C) Weathering releases oxygen that is locked in rocks due to sedimentation.
D) Oxygen that is dissolved in water such as oceans is released.
Answer:
B.) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
Explanation:
4) A solution has a pH of 2.0. What is true about this solution? *
The [H+] is greater than the [OH-].
The poH is 7.
It is a basic solution.
It has a [OH-] of 0.01.
Answer:
A is correct
Explanation:
The pOH is 12
It is acidic
OH- is actually .0000000001
- Hope that helps! Please let me know if you need further explanation.
Determine the volume occupied by 2.5 mol of a gas at 18 °C if the pressure is 81.8 kPa?
Answer:
74 litre
Explanation:
using ideal gas eqation PV=nRT
here P(pressure)=81.8 kPa =81.8×10^3 Pa
moles=2.5
temperature=273.15+18=291.15K
Gas constant R=8.314m^3-Pa/K-mol
now, V=nRT/P = 8.314×2.5×291.5/81.8×10^3 ≈74litre
✌️;)
Dr. Michelle Wang at Cornell University studies DNA replication and protein synthesis. Her group researches how a protein called helicase unzips the DNA strand.
After DNA is unzipped, what is the next step in DNA replication?
A. Messenger RNA forms along the exposed DNA bases.
B. A chromosome with two identical strands of DNA is formed.
C. Nitrogen bases pair up with the DNA strands.
D. Ribosomes attach to DNA and move along the strand.
Answer:
C. Nitrogen bases pair up with the DNA strands.
Explanation:
The correct option would be that nitrogen bases pair up with DNA strands.
DNA replication is a process during which a DNA molecule makes a copy of itself. It represents one of the major processes of gene expression.
DNA replication happens in several steps and it involves several important enzymes: The steps can be summarized in chronological order as follows:
The double helix structure of the DNA is first unwound using a helicase enzyme.A short RNA sequence known as primer binds to each DNA strand. Binding is done at a single site on the leading strand while it is done at multiple sites on the lagging strand.An enzyme known as DNA polymerase then elongates the primers by adding nucleotide bases to grow new strands.Once elongation is complete, the primer disengage and the RNA nucleotide bases are replaced DNA equivalence, the okazaki fragments of the lagging strands is joined by a ligase, the nely synthesized strands are proofread and each strand winds up to their respective parent strand.Hence, the correct option would be that nitrogen bases pair up with the DNA strand.
Correct option: C.
What is the pH of a solution that has a [ ] = 0.020 M?
Answer:
HCl is a strong acid, it dissociates 100% (I.e. completely): [HCl]F = 0.020 M = [H3O+] So, pH = - log [H3O+] = -log [HCl]F = -log(. 020)=1.70 Voila!
2
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Physical Changes Versus Chemical Changes: Mastery Test
Submit Test
2
Select the correct answer.
The metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off. This simple process is
which kind of a change?
ОА a physical change
B. a chemical change
ca nuclear change
OD. an lonic change
Where is groundwater stored?
A. in lakes and rivers
B. in oceans
C. in ice caps at the poles
D. in cracks and pores beneath Earth's surface
Answer:
d
Explanation:
Answer:
Answer is D.
in the cracks and pores beneath Earth's surface
Explanation:
hope this helps!
PLS HELP QUICKLY!!!!!! I AM DOING A TIMED TEST!!!!
Which of the following is an example of radiant energy?
A. The Sun
B. A Car
C. A Plate if Spaghetti
D. Knocking over a glass of water
Answer:
the sun is an example of radiant energy
Answer:
a.the sun
Explanation:
Fields in which this terminology(the body of terms used with a particular technical application in a subject of study, profession) most often used are telecommunications,(communication over a distance by cable, telegraph, telephone, or broadcasting.) heating, radiometry, lighting, and in terms of energy created from the sun.
What’s the two products of H2Co3
Answer:
Hydrogen and Cobalt
Explanation:
Break up each individual element
- Hope that helps! Please let me know if you need further explanation.
what is the reaccion when copper (II) carbonate, Cuco3(s), and
sulfuric acid, H2S04(aq), are mixed.
Answer:
Copper (II) oxide will react with sulfuric acid to create water and copper (II) sulfate. This reaction could be classified as a double displacement reaction or a neutralization reaction (metal oxides have basic properties in water).
so basically a neutralization reaction.
Which is the most dense: honey, milk, or corn syrup?
A. Honey
B. Milk
C. Corn syrup
Answer:
A.honey
Explanation:
Discuss the relationship between the structure of hydrocarbons and their properties of polarity and solubility. How does this compare to water?
Answer:
Hydrocarbon being non polar are soluble only in non polar solvent.
Explanation:
Hydrocarbon molecules either have very little polarity or they do not have polarity at all, this is because of absence of electro-negative atoms in their molecular structure. Due to this their solubility is also affected. The solubility of a compound depends on its polarity as it can dissolve in a polar solvent only when it is polar or else they are soluble in non-polar solvent
what is the most significant force that attracts water molecules to each other?
Answer:
Hydrogen Bonds
hope this helps
~Savannah :))
According to the forces of attraction, hydrogen bonds is the most significant force that attracts water molecules to each other.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
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Consider the total ionic equation below.
Ba2+ + 2NO3 + 2Na+ + Co3 —BaCO3 + 2Na+ + 2NO3
Which is the net ionic equation for the reaction?
O Ba2+ + C03 —> BaCO3
© 2Na+ + co} → Na2CO3
NO3 + Na* —> NaNO3
O Ba2+ + 2NO3 →→ Ba(NO3)2
Answer:
Ba²⁺ + CO₃²⁻ → BaCO₃
Explanation:
A net ionic equation is a way to write a chemical reaction in which you list only the species that are participating in the reaction.
For the reaction:
Ba²⁺ + 2NO₃ + 2Na⁺ + CO₃²⁻ → BaCO₃ + 2Na⁺ + 2NO₃
As you can see, NO₃ and Na⁺ are not participating in the reaction. Thus, net ionic equaation is:
Ba²⁺ + CO₃²⁻ → BaCO₃
Complete Question
Consider the total ionic equation below.
[tex]Ba^{2+} + 2NaO_3^{1 -} + 2Na^{+} + CO_3^{2-} ----> BaCO_3 + 2Na^{+} + 2NO_3^{1-}[/tex]
Which is the net ionic equation for the reaction?
A [tex]Ba^{2+} _{(aq)} + CO_3 ^{2-} _{(aq)} ----> BaCO_3_{(s)}[/tex]
B [tex]2Na^+ + CO_2 ----> Na2CO3[/tex]
C [tex]NO3 + Na ^ + ----> NaNO3[/tex]
D [tex]Ba_2^+ + 2NO3 ----> Ba(NO3)2[/tex]
Answer:
Option A is the correct option
Explanation:
The given ionic equation is
[tex]Ba^{2+} + 2NaO_3^{1 -} + 2Na^{+} + CO_3^{2-} ----> BaCO_3 + 2Na^{+} + 2NO_3^{1-}[/tex]
Looking at this complete ionic equation we see that [tex]Na^{+1} \ and \ NO_3^{1-}[/tex] did not change in the reaction so they will not be included in the net ionic equation so the net ionic equation becomes
[tex]Ba^{2+} _{(aq)} + CO_3 ^{2-} _{(aq)} ----> BaCO_3_{(s)}[/tex]
Whats the answer to 7/2 × 1/5?
Answer:7/10
Explanation:multiply top and bottom
