Answer: I think it’s 4
Explanation:
What is the source of thermal energy for Earth's mantle?
A Earth's core
B. global warming
C. mantle downwelling
D. radiation from the sun
Answer:
D. Radiation from the sun
Explanation:
The main source of thermal energy for the earth is Sun. The sun is major source which provide heat energy and light energy to the earth. The sun converts almost 4 million tons of energy into electromagnetic radiations which is a source of thermal energy for Earth's Mantle.
5.5x10² – 6.50x10'
Express the calculation in correct significant digits
Answer:
[tex]6.15x10^2[/tex]
Explanation:
Hello!
In this case, when performing mathematical operations with numbers in scientific notation, the first step is to write them in standard notation:
550 - 65.0
Thus, the result without any significant figures-based analysis is:
615.0
However, since 550 is significant to the ones and 65.0 to the tenths, we need to round the result to the bigger significance, in this case to the ones; therefore the appropriate result would be:
615
That in scientific notation would be:
[tex]6.15x10^2[/tex]
Best regards!
A chemist adds of a M calcium sulfate solution to a reaction flask. Calculate the mass in grams of calcium sulfate the chemist has added to the flask
Answer:
1.23 g
Explanation:
A chemist adds 1.55 L of a 0.00582 M calcium sulfate solution to a reaction flask. Calculate the mass in grams of calcium sulfate the chemist has added to the flask.
Step 1: Given data
Volume of the solution (V): 1.55 LMolar concentration of the solution (C): 0.00582 M (0.00582 mol/L)Step 2: Calculate the moles (n) of calcium sulfate added
We will use the following expression.
n = C × V
n = 0.00582 mol/L × 1.55 L
n = 0.00902 mol
Step 3: Calculate the mass corresponding to 0.00902 moles of calcium sulfate
The molar mass of calcium sulfate is 136.14 g/mol.
0.00902 mol × 136.14 g/mol = 1.23 g
How are hail and snow different? (Check the picture for answer options)
Answer:
A, Hail is large spheres of ice and snow is small flakes of ice.
A chemist dissolves of pure potassium hydroxide in enough water to make up of solution. Calculate the pH of the solution. (The temperature of the solution is .) Be sure your answer has the correct number of significant digits.
Answer:
12.99
Explanation:
A chemist dissolves 716. mg of pure potassium hydroxide in enough water to make up 130. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits.
Step 1: Given data
Mass of KOH: 716. mg (0.716 g)Volume of the solution: 130. mL (0.130 L)Step 2: Calculate the moles corresponding to 0.716 g of KOH
The molar mass of KOH is 56.11 g/mol.
0.716 g × 1 mol/56.11 g = 0.0128 mol
Step 3: Calculate the molar concentration of KOH
[KOH] = 0.0128 mol/0.130 L = 0.0985 M
Step 4: Write the ionization reaction of KOH
KOH(aq) ⇒ K⁺(aq) + OH⁻(aq)
The molar ratio of KOH to OH⁻is 1:1. Then, [OH⁻] = 0.0985 M
Step 5: Calculate the pOH
We will use the following expression.
pOH = -log [OH⁻] = -log 0.0985 = 1.01
Step 6: Calculate the pH
We will use the following expression.
pH + pOH = 14
pH = 14 - pOH = 14 -1.01 = 12.99
Which describes a difference between cephalopods and gastropods?
Cephalopods have a water vascular system, and gastropods have an open circulatory system.
Cephalopods live only in ocean environments, and gastropods live in a variety of environments.
Cephalopods have a simple nervous system, and gastropods have a complex nervous system.
Cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks. CAN SOMEONE PLZZZZ ANWER THIS I WILL GIVE U 15 PIONTS
Answer:
B
Explanation:
I took the test
Answer:
The correct answer is B
Explanation:
What is POH?
A. pH = log[OH-]
B. POH =[ht][OH-]
C. pOH = -log(OH)
D. pH = -log[H+]
Answer:
The answer is C
Explanation:
2.2.2: The pH Scale
pOH = -log[OH-]
Container A holds 717 mL of an ideal gas at 2.80 atm. Container B holds 174 mL of a different ideal gas at 4.30 atm. Container A and container B are glass spheres connnected by a tube with a stopcock. Container A is larger than container B. If the gases are allowed to mix together, what is the resulting pressure
Answer:
3.09 atm
Explanation:
Given that:
Volume of container A = 717 mL
Pressure of container A = 2.80 atm
Volume of container B = 174 mL
Pressure of container B = 4.30 atm
Now, if the valve are being removed and the gases are allowed to mix together; then
The total final pressure can be calculated by using the formula:
[tex]P_f = \dfrac{P_AVA+P_BV_B}{V_A+V_B}[/tex]
[tex]P_f = \dfrac{2.80*717+4.30*174}{717+174}[/tex]
[tex]P_f = \dfrac{2007.6+748.2}{891}[/tex]
[tex]P_f = \dfrac{2755.8}{891}[/tex]
[tex]\mathbf{P_f =3.09 \ atm}[/tex]
The absence of the intermolecular attraction between the atoms or molecules is called an ideal gas. The pressure of the resultant mixture is 3.09 atm.
What is the relation between pressure and volume?The relationship between the pressure and the volume of the gas is given by Boyle's law which states the inverse proportionality relation with the volume.
Given,
The volume of container A = 717 mL
The volume of container B = 174 mL
The pressure of container A = 2.80 atm
The pressure of container B = 4.30 atm
The total final pressure of the ideal gas of the mixture is calculated by:
[tex]\begin{aligned} \rm P_{f} &= \rm \dfrac{P_{A}V_{A}+ P_{B}V_{B}}{V_{A}+V_{B}}\\\\&= \dfrac{2007.6 +748.2}{891}\\\\&= 3.09 \;\rm atm\end{aligned}[/tex]
Therefore, the total pressure of the mixture is 3.09 atm.
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Can you click the picture
Answer:
B.
Explanation:
Answer:
no but it might just be my computer acting up again
Explanation:
What is the mass number for an atom of zinc containing 30 protons and 34 neutrons?
Answer:
64
Explanation:
mass number =proton + neutron
=30+34=64
Chemistry - Mass/Particle Conversions
Convert 3.89 x 10^23 molecules/formula units of X^4Z^5 into grams of the same compound. (Assume that the molar mass of X is 76.15 grams per mole and the molar mass of Z is 56.3 grams per mole.)
Assume that Avogadro's number is 6.022 x 10^23. Report your answer to three decimal places.
Mass of X₄Z₅= 378.621 g
Further explanationGiven
3.89 x 10²³ molecules/formula units of X₄Z₅
Required
Mass of X₄Z₅
Solution
1 mol = 6.022 x 10²³ particles(molecules, atoms, ions)
N = n x No
No = Avogadro's number
n = mol
Conversion to mol :
n = N : No
n = 3.89 x 10²³ : 6.022 x 10²³
n = 0.646
MW X₄Z₅ :
= 4 x 76.15 + 5 x 56.3
= 304.6 + 281.5
= 586.1 g/mol
Mass :
= mol x MW
= 0.646 x 586.1
= 378.621 g
A mixture of 620 lbmol/h of 36 mol% benzene and the remainder toluene is separated continuously into two products. One product is 98 mol% benzene and the other is 95 mol% toluene. Calculate the flow rates of both products in kmol/h.
Answer:
[tex]P_1=206.7lbmol/h\\\\P_2=413.3lbmol/h[/tex]
Explanation:
Hello!
In this case, for the separation of the benzene-toluene mixture, we can use the following mole balances including the given mole fraction at each stream per species:
[tex]B:0.36*620=0.98P_1+0.05P_2\\\\T:0.64*620=0.02P_1+0.95P_2[/tex]
That can be solved by using a solver for P1 (benzene-rich flow) and P2 (toluene-rich flow):
[tex]P_1=206.7lbmol/h\\\\P_2=413.3lbmol/h[/tex]
Best regards!
Which is an example of a solution?
Answer: Examples:: Rubbing Alcohol, Dissolved Sugar in Water
Explanation:
A solution is a homogeneous mixture made up of two or more substances.
Gallium (Ga) consists of two naturally occurring isotopes with masses of 68.926 and 70.925 amu. (a) How many protons and neutrons are in the nucleus of each isotope
Answer:
[tex]neutrons_{Ga-69}=38\\\\neutrons_{Ga-71}=40[/tex]
Explanation:
Hello!
In this case, since isotopes of the same element have the same number of protons and electrons but different atomic mass, we can compute the number of neutrons by subtracting the number of protons to the atomic mass of the isotope; thus, for Ga-69 and Ga-71 (rounded up to whole numbers), we obtain:
[tex]neutrons_{Ga-69}=69-31=38\\\\neutrons_{Ga-71}=71-31=40[/tex]
Best regards!
A scientist observes several different fossils in a
rock layer. Based on this observation, which is
the best conclusion?
A. The fossils are composed of lava that cooled
around several organisms.
B. The fossils formed about the same time as the
rock layer in which they were found.
C. The fossils formed after heat and pressure
changed the type of rock in the rock layer.
D. The fossils are composed of the same material
as the organisms from which they formed.
A scientist observes several different fossils in a
rock layer. Based on this observation, which is
the best conclusion?
Answer:A. The fossils are composed of lava that cooled
A. The fossils are composed of lava that cooledaround several organisms.
B. The fossils formed about the same time as the rock layer in which they were found.
Explanation:That's the right answer but you can choose one.
#CARRYONLEARNING #STUDYWELLA 0.0300 mol sample of NO2(g) is placed in a rigid 1.00 L reaction vessel and allowed to reach equilibrium at a certain temperature. What is the value of Kc at this temperature if 0.00500 mol of N2O4(g) is present at equilibrium
Answer:
12.5
Explanation:
Step 1: Write the balanced equation
2 NO₂(g) ⇄ N₂O₄(g)
Since the reaction takes place in a 1.00 L vessel, the initial concentration of NO₂ is 0.0300 M and the concentration at equilibrium of N₂O₄ is 0.00500 M.
Step 2: Make an ICE chart
2 NO₂(g) ⇄ N₂O₄(g)
I 0.0300 0
C -2x +x
E 0.0300-2x x
Step 3: Find the value of x
Since [N₂O₄]eq = 0.00500 M, x = 0.00500
Step 4: Calculate the concentrations at equilibrium
[NO₂] = 0.0300-2(0.00500) = 0.0200 M
[N₂O₄] = 0.00500 M
Step 5: Calculate the concentration equilibrium constant (Kc)
Kc = [N₂O₄]/[NO₂]²
Kc = 0.00500/0.0200²
Kc = 12.5
What are the products of the acid-base reaction of sodium carbonate with acetic acid?
Answer:
The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution. The reaction is: Sodium bicarbonate and acetic acid reacts to carbon dioxide, water and sodium acetate.
Explanation:
hope this helps
A chemist determines by measurements that moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen gas that participates.
Answer:
0.56 g
Explanation:
A chemist determines by measurements that 0.020 moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen gas that participates.
Step 1: Given data
Moles of nitrogen gas (n): 0.020 mol
Step 2: Calculate the molar mass (M) of nitrogen gas
Molecular nitrogen is a gas formed by diatomic molecules, whose chemical formula is N₂. Its molar mass is:
M(N₂) = 2 × M(N) = 2 × 14.01 g/mol = 28.02 g/mol
Step 3: Calculate the mass (m) corresponding to 0 0.020 moles of nitrogen gas
We will use the following expression.
m = n × M
m = 0.020 mol × 28.02 g/mol
m = 0.56 g
When NH3(aq) is added to Cu2 (aq), a precipitate initially forms. Its formula is:
a. Cu(NH)3
b. Cu(NO3)2
c. Cu(OH)2
d. Cu(NH3)22
e. CuO
When NH₃(aq) is added to Cu₂(aq), a precipitate initially forms. Its formula is Cu(NH₃)². The correct option is d.
What is a chemical formula?A chemical formula is a representation of chemical elements and chemical compounds. The chemical letters are used to write the chemical formula. The charges if present is written by charges symbols like plus, minus.
The chemical reaction is
NH₃(aq) + Cu₂(aq) = Cu(NH₃)²
This is called a chemical reaction, which contains reactant on the left side and products on the right side. The precipitate that is formed is copper ammonia whole twice.
Precipitation is the solid crystals' substance that is come out at the surface of the liquid. It is collected in solid form, and it is called a precipitate.
Thus, the correct option is d. Cu(NH₃)².
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Draw a Lewis structure for H3O+ . Include all hydrogen atoms and show all unshared electrons and the formal charges, if any. Assume that bonding follows the octet rule.
Answer:
In this Lewis equation it can be seen how oxygen and hydrogen have a dative union, that is, there is a proton that is temporarily "borrowed"
Explanation:
This molecule is the same as water but with one more hydrogen, that is why the general charge of the molecule is positive
If you had a cup full of methanol and a pool full of methanol do you think they would have the same density or different density?
Answer:
same density
Explanation:
The amount of methanol is a quantitative characteristic, and by the other side the density of methanol is a qualitative characteristic. What I mean is that the amount of methanol is not related to the density; it would be the same density no matter how much methanol you have.
What happened to the missing neutron?
•it will turn into a proton and an electron
•it became gamma radiation
•it got absorbed by the electrons
Answer:
it became gamma radiation, it will turn into a proton and an electron
Explanation:
WILL MARK ASBRANLYST!!!!
All successful organisms must be able to do what three things? Question 1 options: A. obtain energy, eat, play video games B. obtain energy, produce offspring, maintain their structure C. maintain their structure, eat, build a home D. obtain energy, produce offspring, eat
Answer:obtain and use resources, grow, reproduce, and maintain stable internal conditions while living in a constantly changing external environment.
Explanation:
All successful organisms must be able to do the three things including obtain energy, produce offspring, maintain their structure. The correct option is B.
What is an organism?In biology, an organism is any natural, living system that functions as a separate entity. Cells make up all organisms.
Taxonomy divides organisms into groups such as multicellular animals, plants, and fungi, or unicellular microorganisms such as protists, bacteria, and archaea.
The current classification system is based on the Linnean system and has eight levels of taxa: domain, kingdom, phylum, class, order, family, genus, and species.
All successful organisms must be able to do three things: obtain energy, generate progeny, and maintain their respective structure.
Thus, the correct option is B.
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Which element easily gains one electron to form a negative ion?
Flourine
Magnesium
Nitrogen
Lithium
Answer: Fluorine
Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.
Answer:
Fluorine.
Explanation:
I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.
Question 3 (1 point)
Consider the following unbalanced chemical equation representing the combustion of methane, yielding carbon dioxide and water.
CH4 + O2 --> CO2 + H20
If you had burned 800 g of methane, how many moles of Carbon dioxide would be produced?
A)122.22
B)8
C)2200
D)100
E)670
F)750
G)50
Answer:
Im pretty sure its B
Explanation:
Answer:
G) 50 mol
Explanation:
Given data:
Mass of methane = 800 g
Number of moles of CO₂ produced = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of methane:
Number of moles = mass/molar mass
Number of moles = 800 g/ 16 g/mol
Number of moles = 50 mol
Now we will compare the moles of methane and carbon dioxide.
CH₄ : CO₂
1 : 1
50 : 50
Explain the concept of “Happy Atoms” as it relates to why atoms bond together.
Answer:
I think this means that they always compatible so th er e basically friends and they stick together. c: hope I helped
Why does solid water (ice) float when placed in liquid water? *
Ice does not float in liquid water.
Ice is less dense than liquid water.
Ice is more dense than liquid water.
The densities of liquid water and ice are the same .
Answer:
Ice is less dense than water.
How are protons and neutrons similar? How are they different?
Answer:
They are both in the nucleus of an atom, they have different charges
Explanation:
Protons and neutrons are similar because they are both in the nucleus of the atom, being orbited by the electron(s). They are different, however, because they have different charges, the proton is positively charged and the neutron is neutral.
hope this helped:)
What are 4 ways you can improve your skeletal system health?
Answer:
1. get vitamin c
2. get your bone mineral density tested
3. don't smoke or drink excessively
4. start weight-bearing exercise
Explanation:
helps improve skeletal system
What would happen if a plant was unable to receive pollen? A.the plant would continue to produce fruits and seeds. B.the plant would be unable to produce fruits and seeds.
C.Instead of the pistil producing pollen, the ovule would produce it.
D.Instead of the stamen producing pollen, the stigma would produce it.
Answer:
I think its B only because nothing else makes sense
Explanation:
but you should take your best guess
To solve this we must be knowing each and every concept related to plant. Therefore, if a plant was unable to receive pollen then the plant would be unable to produce fruits and seeds. The correct option is option B.
What is plant?Plants are mostly photosynthetic eukaryotes in the Plantae kingdom. Traditionally, the plant kingdom comprised all non-animal living creatures, including algae and fungi; but, all current definitions include Plantae exclude fungi and certain algae, as well as prokaryotes.
According to one definition, plants belong to the group Viridiplantae (Latin for "green plants"), which is sister to the Glaucophyta and includes green algae as well as Embryophyta (land plants). If a plant was unable to receive pollen then the plant would be unable to produce fruits and seeds.
Therefore, if a plant was unable to receive pollen then the plant would be unable to produce fruits and seeds. The correct option is option B.
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