Answer:
I believe the answer is three: Lead, sulfur, and oxygen
Explanation:
How much of the original energy of the producers is available to an organism in the third trophic level?
Answer:
Energy is passed up a food chain or web from lower to higher trophic levels.
Explanation:
However, generally only about 10 percent of the energy at one level is available to the next level. This is represented by the ecological pyramid in Figure below.
Answer:
generally only about 10 percent of the energy at one level is available to the next level
Explanation:
thank you
2. When multiplying or dividing measured numbers, we use the measurement with the least number of
significant figures to determine the number of significant figures (sf) in our answer. For example:
3.5 cm x 4.75 cm = 17 cm2 (even though the calculator gives 16.675) Solve the following problems
assuming all are measured numbers. Report the correct number of significant figures.
a. 7.00 x 15.00 =
b. 40.2 . 1.901 =
c. (0.003)(13.2) =
d. 1.590 ÷ 0.3975 =
Answer:
a. 105
b. 76.4
c. 0.04
d. 4.000
Explanation:
Question a. has three significant figures
Question b. has three significant figures
Question c. has one significant digit (only the 3 is significant in the question, zeros are only significant if they are trailing with the presence of a decimal point or in between two non-zero numbers)
Question d. has four significant figures
HELP WILL GIVE BRAINLIEST!!!
1.) The followoing reaction, HNO3(aq) + KOH(aq) → H2O(l) + KNO3(aq), is an example of which kind of reaction?
a
A redox reaction
b
A double replacement reaction
c
A synthesis reaction
d
A single replacement reaction
2.) Use the solubility guidelines to identify the products (if there are any) resulting from mixing the following two solutions. A solution of magnesium sulfate, MgSO4(aq), is mixed with a solution of barium nitrate, Ba(NO3)2(aq).
a
BaSO4(s) and Mg(NO3)2(aq)
b
BaSO4(aq) and Mg(NO3)2(s)
c
BaSO4(s) and Mg(NO3)2(s)
d
There will be no reaction.
3.) Use the solubility guidelines to identify the products (if there are any) resulting from mixing the following two solutions. A solution of copper(II) sulfate, CuSO4(aq), is mixed with a solution of potassium nitrate, KNO3(aq).
a
Cu(NO3)2(s) and K2SO4(aq)
b
Cu(NO3)2(aq) and K2SO4(s)
c
Cu(NO3)2(s) and K2SO4(s)
d
There will be no reaction.
4.) Use the activity series to identify the products (if there are any) that result from placing a strip of elemental lead metal, Pb(s), into a solution of silvr nitrate, AgNO3(aq).
a
Pb(NO3)2(aq) and Ag(s)
b
Pb(NO3)2(s) and Ag(aq)
c
PbAg2(s) and NO3(g)
d
There will be no reaction.
Time left for this assessment:
83:46
the anwser is Certybe Explanation:
What defines the mass number of an isotope?
A. The sum of the neutrons and protons
B. The sum of the neutrons and electrons
C. The number of neutrons
D. The number of protons
Answer:
a
Explanation:
Answer:
A
Explanation:
What are three different ways an animal uses energy from its food
Answer:
Animals obtain energy from the food they consume , using that energy to maintain body temperature and perform other metabolic functions. Glucose, found in the food animals eat ,is broken down during the process of cellular respiration into energy source called ATP.
given a magnesium value of 4.5mg/dL, what is the result in SI units?
Answer:
[tex]4.5x10^{-5}\frac{kg}{L}[/tex]
Explanation:
Hello!
In this case, since the density in the international system of units is given in terms of kg for the mass and L for the volume, we need to perform a process of units conversions from mg and dL to kg and L as show below:
[tex]4.5\frac{mg}d{L}*\frac{1kg}{1x10^6mg} *\frac{10dL}{1L} \\\\4.5x10^{-5}\frac{kg}{L}[/tex]
Best regards!
Can someone help me with that pls
Answer:
The one that's highlighted in blue is the answer
Answer:
Explanation:
EVAPERATION --- is water falling back to the earth
CONDUNSATION -- Process where water vapor is cooled
RUNOFF ---- Process where the water that falls back down to earth runs over to lakes, river, and ocean
How many grams of Mg are needed to produce 224 g of MgO in the complete reaction of Mg
with oxygen gas?
Answer:
134.4 g of Mg
Explanation:
reaction:
2Mg + O2 ➡️ 2MgO
1) find the mol of MgO
mol = mass / molar mass
mass = 224 g
molar mass = 24+16 = 40
mol = 224 / 40
= 5.6 moles
2 mol = 5.6 moles
2) find the mass of Mg
mass = mol × molar mass
mol = 5.6
molar mass = 24
mass = 5.6 × 24
= 134.4 g
How many milliliters (mL) of 0.610 M NaOH solution are needed to neutralize 20 mL of a 0.245 M H2SO4 solution?
The milliliters (mL) of 0.610 M NaOH solution are needed to neutralize 20 mL of a 0.245 M H₂SO₄ solution is 8.03 mL.
How we calculate the volume?Volume of the solution, when molarity is given will be calculated by using the below formula as:
M₁V₁ = M₂V₂, where
M₁ = molarity of H₂SO₄ solution = 0.245 M
V₁ = volume of H₂SO₄ solution = 20 mL
M₂ = molarity of NaOH solution = 0.610 M
V₂ = volume of NaOH solution = to find?
On putting all values on the above reaction and calculate for V₂ as:
V₂ = (0.245)(20) / (0.610) = 8.03 mL
Hence, required volume is 8.03 mL.
To know more about molarity, visit the below link:
https://brainly.com/question/26873446
It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium.
a. True
b. False
It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium is false it takes less than 14 billion years to completely burn through its fuel.
What does red dwarf star mean?A red dwarf is one of the smallest and coldest stars on the main sequence. As red people are the most common type of star in the Milky Way, at least in the vicinity of the Sun, but because of their low luminosity, people cannot be easily observed.
In the solar core, the temperature and density are gigantic and cause nuclear fusion of hydrogen into helium. Four hydrogen atoms fuse to form a helium atom. And this fusion is an incredible way to produce energy.
See more about red dwarf at brainly.com/question/25981690
Photodissociation of ozone (O3) can be described as producing an oxygen atom with heat of formation 247.5 kJ/mol. However, in reality photodissociation yields an oxygen atom that is temporarily in an excited state (O*) with a standard enthalpy of 438 kJ/mol.
O3 + hv → O2+ O^+
H^o: (142.9) (0) 438(KJ/mol)
Required:
What maximum wavelength could cause this photodissociation?
Answer:
0.2193 μm
Explanation:
The reaction showing the Photodissociation of ozone (O3) is given below as:
O₃ + hv --------------------------> O₂ + O⁺
H° (142.9) (0) (438kJ/mol).
The first thing to do here is to determine the change in the enthalpy of the total reaction, this can be done by subtracting the change in the enthalpy of the reactant from the change in enthalpy in the product. Hence, we have:
ΔH° = [438 kJ/mol + 247.5 kJ/mol] - (142.9) = 542.6 KJ/mol.
This value, that is 542.6 KJ/mol will then be used in the determination of the value for the maximum wavelength that could cause this photodissociation.
Therefore, the maximum wavelength could cause this photodissociation ≤ h × c/ E = [ 1.199 × 10⁻⁴]/ 542.6 = 2.193 × 10⁻⁷ = 0.2193 μm
If z = 4.0 and y = 9.6, what is the value of x?
Answer:
The value of x will be "1.4".
Explanation:
The given values are:
y = 9.6
z = 4.0
As we know,
The relation between x, y and z is:
⇒ [tex]z = \frac{y}{x}[/tex]
and,
⇒ [tex]x=\frac{y}{z}[/tex]
On substituting the given values, we get
⇒ [tex]=\frac{5.6}{4.0}[/tex]
⇒ [tex]=1.4[/tex]
50POINTS!
In the ideal gas Law (PV=nRT) R is a constant. What is a constant?
A. A number that remains the same or does not change the conditions
B. A number that doubles if the variable quadruples
C. A number that is tripled
D. A number that approaches infinity
Look up my name and who am i
Answer:
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Explanation:
