The group of choices associated with the given question are as follows:
Organisms once thought to be unrelated may be found to be related.
Mode of nutrition of some organisms may change.
Organisms that do not have a backbone may develop one.
All multicellular organisms may be found to be prokaryotes
Answer:
The correct answer would be - Organisms once thought to be unrelated may be found to be related
Explanation:
Classification of the organisms is based on the shared characteristics and structural or environmental similarities of the organisms which are modified and evolved during the period of time. It is also known as life sciences evolve and genetic code provides more accurate information.
These evolutionary changes and will lead to certain organisms that are once thought to be unrelated organisms that may actually be related based on a genetic code. These codes have every small and accurate change that occurs and can also find out when these changes occured.
What is the molarity to the nearest hundredth of a solution made by dissolving 1.71 moles of NaOH in enough water to produce an 875 mL solution? (REMINDER THE VOLUME MUST BE IN L. 1000 ML = 1 L)
Answer:
Explanation:
50 is the volume
Answer: 1.95 mol/l
Explanation: molarity = concentration = amount of substance/volume.
Also v = n/V= 1.71 mol/ 0.875 litres= 1.9542857 mol/l
What is the correct IUPAC name for the acid: H2Lv
Reading and Discussing an Article about Making a Homemade Voltaic Cell
In the space provided, describe your sketch using terms you have learned in the lesson.
Answer: The following should be included in your description
• Zinc is the anode, and copper is the cathode
• The lemon flesh and juice provide the salt bridge and electrolyte solution
• Electrons flow from zinc to copper through the external wires
• Electrolytes flow in the lemon. Positive ions (cations) moved toward copper electrodes (cathodes), and negative ions (anions) move toward zinc electrodes (anodes). These balance the charges building up
• Two cells in series provide more energy output than one. The clock may need more energy than can be supplied by one cell
• Batteries do not need external source of reactants, whereas a fuel cell must be supplied with reactants
Explanation: Edg 2021
50 points if its right In the Northern Hemisphere, choose ALL that apply
Question 2 options:
Summer solstice occurs when the Earth's North Pole is tilted toward the sun.
Fall and Spring Equinoxes occur when days and nights are equal in length.
The tilt and revolution of the Earth causes the seasons
Winter solstice occurs when the Earth's North Pole is tilted away from the sun.
Answer:
All are correct
Explanation:
I took the test
Answer: pick all
Explanation:
i got 100% on my qiuz
How do ethnics affect scientific research ?
Answer:
A
Explanation:
scientists should not be allowed to conduct research that is harmful to others.
What is the answer:
C4H8+H2=
Based on the data what can be inferred about the biotic factors of this religion
Answer:
I would say the answer is D
Explanation:
What is electrolysis
Answer:
Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them. Electricity is the flow of electrons or ions.
Explanation:
hope it helped:)))))
Please help fast. I will give brainliest!
Answer:
c=-1+x=varible+a=(5)^3
Explanation:
facts
A container is filled with 12.5 g of O, gas, what is this amount in liters?
If the initial rate of H2 to disappear is 2.0 moles per second, what is the rate of appearance of NH3 at the same time? N2(g) 3 H2(g) ⇌ 2 NH3(g)
Answer:
1.33 moles per second
Explanation:
From the balanced equation of reaction, 3 moles of H2(g) need to disappear/be consumed before 2 moles of NH3(g) can be formed/appear.
According to reaction law, the rate of disappearance of reactants is equal to the rate of appearance of products.
Now, only 2 moles per seconds of H2 has disappeared initially;
3 moles H2 is needed for 2 moles NH3
2 moles H2 will give; 2 x 2/3 = 4/3 or 1.33 moles
Hence, if the initial rate of disappearance of H2 is 2.0 moles per second, the initial rate of appearance of NH3 would be 1.33 moles per second.
what is the effect of light on valence electrons?
Answer:
When a small amount of external energy in the form of light is applied to the conductor, the valence electrons gain enough energy from the light to break the bonding with the atom and they jumps into the conduction band.
The effect of light on valence bis absent negative charges in the valence band, correspond to electrons elevated to the conduction band. When the semiconductor is lit, current flow is increased by both electrons and holes.
Why are valence electrons important?The outermost or valence shell electrons, known as valence electrons, are crucial because they shed light on an element's chemical characteristics and are the ones that are acquired, lost, or shared during a chemical reaction.
In general, when an atom's outermost electron shell is full, it is at its most stable and least reactive.
Thus, The valence electrons get enough energy from the light to break their link with the atom and move into the conduction band when a modest amount of external energy in the form of light is delivered to the conductor.
To learn more about the valence electron, follow the link;
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Which element has chemical properties most similar to carbon (C)?
A. Lithium
B. Silicon
C. Titanium
D. Neon
Answer:
b
Explanation:
Silicon has the chemical properties that are most similar to those of carbon
which type of window is double glazed window
Answer:
Hope this helps and have a good day!
Explanation:
Double glazed is a fancy term for a window that has two panes of glass. There are also triple glazed windows (three panes). The multiple panes of glass in a single window frame helps with insulation.
Find the mass of 1.59 mol of NH3.
Please show the work if you can!
Answer:
25.4/km=3
Explanation:
A cough medicine contains 0.25% (w/v) dextromethorphan, a cough suppressant, and 1.1% (w/v) guaifenisin, an expectorant. How many milligrams of each drug would you obtain from 1.5 tsp of cough syrup? (1 tsp = 4.93 mL)
Answer:
See explanation
Explanation:
We know that we obtain the w/v % concentration as follows;
w/v (%) = [mass solute (g) ÷ volume solution (mL)] × 100
volume of solution = 4.93 mL
So,
For dextromethorphan
0.25 = mass/4.93 * 100
0.25 * 4.93 = 100 mass
mass = 0.25 * 4.93/100
mass = 0.0123 g
For guaifenisin,
1.1 = mass/4.93 * 100
1.1 * 4.93 = 100 mass
mass = 1.1 * 4.93/100
mass = 0.0542g
What is the electron configuration of the element in period 2 that has 6 valence electrons?
Answer:
The order of a element in period 2 that has 6 valence electrons is:
1s²2s²2p²
Explanation:
The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1. Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f. In the sub-level s there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.
In level 1 there is only one sub-level, which will be the s. In level 2 there are 2 sub-levels, the s and the p. At level 3 there are 3 sub-levels s, p and d. And at level 4 there are 4 sub-levels, the s, the p, the d and the f.
Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom. This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.
The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on.
So, the order of a element in period 2 that has 6 valence electrons is:
1s²2s²2p²
The following symbol (<-->) means
Answer:
Greater than or less than
In the Haber reaction shown below, _______?is the
limiting reactant if equal moles of each reactant are used.
3H2 + N2 -> 2NH3
Answer: hydrogen
Explanation:
How is stoichiometry used to calculate the amount of product produced?
A. Stoichiometry measures the amount of product obtained.
B. Stoichiometry determines the molar mass of the product.
C. Stoichiometry calculates the grams of the limiting reagent.
D. Stoichiometry relates moles of product.
Answer:
Stoichiometry relates moles of reactant to moles of product
Explanation:
Just took the quiz :)
Answer:
Stoichiometry relates moles of reactant to moles of product.
Explanation: :)
A change of state does not affect an object's what?
Answer:
mass.
Explanation:
How many moles of NaCl are contained in 100.0 mL of a 0.20 M solution?
Answer:
0.02 mol.
Explanation:
A H2CO3 (aq) ---> CO2 (g) + H2O (l) B H2SO4 (aq) + 2NaOH (aq) ---> Na2SO4 (aq) + 2H2O (l) C 2H2 (g) + O2 (g)----> 2H2O (l) D AgNO3 (aq) + NaOH (aq) ---> AgOH (s) + NaNO3 (aq) Which equation above represents a precipitation reaction?
Answer: [tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The equation which represents a precipiation reaction is:
[tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
An organism from the past that is related to all the organisms in the group is called?
Answer:
phylogenic trees/phylogeny
Explanation:
the evolutionary history and relationship of an organism or group of organisms is called its phylogeny
Can somebody help please
Answer:
98 moles of H₂O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2HCl + CaCO₃ —> CaCl₂ + H₂O + CO₂
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of H₂O.
Finally, we shall determine the number of mole of H₂O produced by the reaction of 98 moles of CaCO₃. This can be obtained as follow:
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of H₂O.
Therefore, 98 moles of CaCO₃ will also react to produce 98 moles of H₂O.
Thus, 98 moles of H₂O were obtained from the reaction.
12) Balance the following chemical equation:
Zn +
H3PO4
Zn3(PO4)2 +
H2
Answer:
Sorry I am not very good at chemistry.
Explanation:
How many particles of CuCr2O7 are present in a 64.5 gram sample?
1.39 × 10²³ particles CuCr₂O₇
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 64.5 g CuCr₂O₇
[Solve] particles CuCr₂O₇
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of Cu - 63.55 g/mol
[PT] Molar Mass of Cr - 52.00 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of CuCr₂O₇ - 63.55 + 2(52.00) + 7(16.00) = 279.55 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 64.5 \ g \ CuCr_2O_7(\frac{1 \ mol \ CuCr_2O_7}{279.55 \ g \ CuCr_2O_7})(\frac{6.022 \cdot 10^{23} \ particles \ CuCr_2O_7}{1 \ mol \ CuCr_2O_7})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 1.38944 \cdot 10^{23} \ particles \ CuCr_2O_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.38944 × 10²³ particles CuCr₂O₇ ≈ 1.39 × 10²³ particles CuCr₂O₇
This is hard, isn't it? please help me though. PLEASE
2. What is the pressure of a fixed volume of hydrogen gas at 30.0°C if it has a pressure of 1.11 atm at 15.0°C?
Answer:
1.17
Explanation:
1.17 hope this helps
The initial pressure of the fixed volume of the hydrogen gas as the pressure and temperature decreased is 1.17atm.
What is Gay-Lussac's law?Gay-Lussac's law states that the pressure exerted by a given quantity of gas varies directly with the absolute temperature of the gas.
It is expressed as;
P₁/T₁ = P₂/T₂
Given the data in the question;
Initial pressure P₁ = ? Initial temperature T₁ = 30.0°C = 303.15KFinal pressure P₂ = 1.11atmInitial temperature T₂ = 15.0°C = 288.15KWe substitute our values into the expression above.
P₁/T₁ = P₂/T₂
P₁T₂ = P₂T₁
P₁ = P₂T₁ / T₂
P₁ = ( 1.11atm × 303.15K ) / 288.15K
P₁ = 336.4965 / 288.15K
P₁ = 1.17atm
Therefore, the initial pressure of the fixed volume of the hydrogen gas as the pressure and temperature decreased is 1.17atm.
Learn more about Gay-Lussac's law here: https://brainly.com/question/1358307
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UGRENT! Please help showing all work
Answer:
a. Oxygen
b. 2.62 g of NO
c. 85.2%
Explanation:
Let's see the presented reaction:
4NH₃ + 5O₂ → 4NO + 6H₂O
4 moles of ammonia react to 5 moles of oyxgen in order to produce 4 moles of NO and 6 moles of water.
To determine limting reagent, we need moles of each reactant. Let's calculate them:
3.25 g /17 g/mol = 0.191 moles
3.50 g /32 g/mol = 0.109 moles
4 moles of amonia react to 5 moles of oxygen
Then, 0.191 moles will react to (0.191 . 5) / 4 = 0.238 moles
We only have 0.109 moles available and we need 0.238, so the oxygen is the limting reactant.
5 moles of O₂ can produce 4 moles of NO
So, our 0.109 moles will produce (0.109 . 4) /5 = 0.0872 moles
We convert the moles to mass: 0.0872mol . 30g/mol = 2.62g
(Yield produced / Theoretical yield) . 100 = %
(2.23g / 2.62g) . 100 = 85.2%
