Answer:
7
Explanation:
There are seven major levels of classification: Kingdom, Phylum, Class, Order, Family, Genus, and Species.
So, the answer is option A.
What is the correct sequence of chemical transformations with the correct phases?
Answer:
1. Cu(s) 2. Cu(NO3)2 (aq) 3. Cu(OH)2 (s) 4. CuO (s) 5. CuSO4 (aq) 6. Cu(s)
Explanation:
What is the molarity of a 3.00 L solution that contains 0.400 mol FeCl3?
1.20 M
0.266 M
7.50 M
0.133 M
Answer: 0.133 mol/l
Explanation: molality = concentration = 0.400 mol/3.0 l
does anyone know the answer to this
Is wrought iron substitutional or interstitial?
Answer:
interstitial is correct my child
Explanation:
Compare and contrast the way energy can transfer from one object to another.
Answer:
Energy is transferred from the hotter object to the cooler one, and the difference in temperature between them decreases.Explanation
Please help on question 7 and 8, i really need help and this is for marks! I only have 9 min left i will mark brainliest to whoever gives the best answer!
Answer:
I'm going to go with conduction
Explanation:
At first I thought it was combustion but I read the problem incorrectly. It seems like the liquid boils after you put them on the hot plate.
It's most likely conduction because heat and energy is being transferred into the liquid from the hot plate
Consider the Fischer ester synthesis of methyl benzoate from benzoic acid and methanol in the presence of sulfuric acid as a catalyst. A reaction was performed in which 3.8 g of benzoic acid was reacted with excess methanol to make 2.0 g of methyl benzoate. Calculate the theoretical yield and percent yield for this reaction.
Answer:
48.8%
Explanation:
The reaction has a 1:1 mole ratio so;
Number of moles of benzoic acid reacted = mass/molar mass = 3.8 g/122.12 g/mol = 0.03 moles
So;
0.03 moles of methyl benzoate is formed in the reaction
Mass of methyl benzoate formed = 0.03 moles * 136.15 g/mol = 4.1 g
percent yield = actual yield/theoretical yield * 100/1
percent yield = 2.0 g/4.1 g * 100 = 48.8%
how do I do this I’m confused
by using pro.gram..
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[tex]{\huge{\purple{\underline{\underline{✎﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏}}}}}[/tex]
Predict the shape of the molecule....
Answer: trigonal bipyramidal
Explanation:
Number of electron pairs = [tex]\frac{1}{2}[V+N-C+A][/tex]
V = number of valence electrons present in central atom
N = number of monovalent atoms bonded to central atom
C = charge of cation
A = charge of anion
[tex]SbCl_5[/tex] :
In the given molecule, antimony is the central atom and there are five chlorine as monovalent atoms.
The number of electron pairs are 5 that means the hybridization will be [tex]sp^3d[/tex] and geometry of the molecule will be trigonal bipyramidal.
Ok so N2+O2=2NO and my delta h is 180.5 kJ I need to know. If I react 10 g of nitrous gas with excess oxygen how many grams of Nitrogen monoxide will be produced
Answer:
21.6 grams
Explanation:
N₂ + O₂ → 2NOFirst we convert 10 g of N₂ into moles, using its molar mass:
10 g ÷ 28 g/mol = 0.36 mol N₂Then we convert 0.36 moles of N₂ into moles of NO, using the stoichiometric coefficients of the balanced reaction:
0.36 mol N₂ * [tex]\frac{2molNO}{1molN_2}[/tex] = 0.72 mol NOFinally we convert 0.72 NO moles into grams, using its molar mass:
0.72 mol NO * 30 g/mol = 21.6 ghow many moles are 20 grams of Helium ?
Answer: The correct answer is 5.00 moles
Explanation:
A student pours 800.0 mL of a 3.000 molar solution of sodium hydroxide into a 2.00 liter volumetric flask and fills the flask up with water. What is the new molarity of the solution?
5 points
12.00 M
1.20 M
14.00 M
0.0750 M
The electron affinity of an element is positive if energy is absorbed during the process of accepting an electron and negative if energy is released during the process. Using the electron configuration of the atom or ion undergoing the addition of an electron, predict whether the electron affinity will be positive or negative for the following reactions, and classify them accordingly.
Atom or ion Electron configuration
Ne 1s22s22p6
Br 1s22s22p63s23p64s23d104p5
Na 1s22s22p63s1
Mg 1s22s22p63s2
Cl 1s22s22p63s23p6
Answer:
See explanation
Explanation:
Ne is a noble gas. It already has an octet of electrons hence, the electron affinity of neon is negative.
Br is a halogen, halogens need one electron to complete their octet. The electron affinity for bromine is negative.
Sodium is a metal that has only one electron in its outermost shell. The electron affinity of sodium is positive.
Magnesium is a metal having two electrons in its outermost shell. The electron affinity of magnesium is positive.
Chlorine is another halogen, energy is released when an electron is added to chlorine hence the electron affinity of chlorine is negative.
Which simple machine is best used to split apart an object
A. A screw
B. A lever
C. A wedge
D. A pulley
Answer:
its A screw :))) your welcome
3. Which of the following describes the author's purpose in the text? R1.6
A.
to encourage students not to think about money when they're
choosing a degree or career to pursue
B. to stress the importance of viewing college as a way to develop jobs
skills, as well as determine what is important to you
C. to discourage students from pursuing careers in business, as people
are generally dissatisfied with their lives
D. to encourage students to pursue careers that help other people, as
they are usually the most enjoyable and meaningful
Answer:
B
Explanation:
I took the assessment
2. How many grams are in 2.05 x 1030 atoms of Lithium (Li)?
which type of neuron carries impulses from the brain?
Answer:
Using my searching skills, the answer is motor neurons.
Explanation:
Motor neurons carry impulses from the brain and spinal cord to muscles or glands.
Hydrocyanic acid is a weak acid. Therefore, the salt KCN is
Question 4 options:
Basic
Amphoteric
Neutral
Acidic
describe an example of abiotic conditions and give an example.
Answer:
Abiotic does not mean dead. It means never alive.
Examples of abiotic factors are rocks. weather
Explanation:
because
CH4 Structural formulas
Explanation:
Methane = CH4(formula)
Which aquatic organism would be least likely to survive in a <7 pH environment?
protozoa
worms
algae
bacteria
Aqueous hydrochloric acid HCl will react with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H2O. Suppose 15.7 g of hydrochloric acid is mixed with 27. g of sodium hydroxide. Calculate the maximum mass of sodium chloride that could be produced by the chemical reaction.
Answer:
25.155 gram
Explanation:
HCl(aq.) + NaOH(aq.) ⇒ NaCl + H2O
According the above equation equal number of moles of reactant are producing same number of moles of products.
Now, no. mole of HCl = 15.7/(1+35.5) = 0.43 moles
no. of moles of NaOH = 27/(23+16+1) = 0.675 moles
Since the amount of sodium hydroxide exceeds the amount of hydrochloric acid, the maximum amount of each substance participating in the reaction is HClν ν 0.43 moles .Therefore, the maximum amount of NaCl that can be produced is as follow
= (23+35.5)×0.43 = 25.155 gram
plz help me with this question
Cars rust because when metal comes into contact with water or some sort of water form, it will make the surface wet. If the metal is wet for too long, it will start to soak up the water, therefore making it rusty. The salt will also rust a car. It does this because the mix of carbon dioxide and oxygen in the salt will eat away at the car, making it rust faster. Hope this helps!
Suggest two observations that would be made when rubidium is added to cold water.
Answer:
1. Rubidium metal reacts very rapidly with water to form a colorless basic solution of rubidium hydroxide (RbOH) and hydrogen gas (H2).
2. Rubidium sinks because it is less dense than water. It reacts violently and immediately, with everything leaving the container. Rubidium hydroxide solution and hydrogen are formed.
A 20.06-mL sample of hydrochloric acid solution requires 25.00 mL of 0.149 M sodium hydroxide for complete neutralization. What is the concentration of the original hydrochloric acid solution?
Answer:
The concentration of the original hydrochloric acid solution is - 0.1856 M
Explanation:
Lets calculate-:
Neutralization reaction follows dilute principle
[tex](N_1)(V_1)=(N_2)(V_2)[/tex] For titration between NaOH and HCl
[tex](M_1)(V_1)_H_C_l=(M_2)(V_2)_N_a_O_H[/tex]
Putting the given values ,
[tex]M_1\times 20.06ml=0.149M\times25.0ml[/tex]
[tex]M_1_H_C_l=\frac{0.149\times25.0}{20.06}[/tex]
= 0.1856 M
Hence , the concentration of hydrochloric acid solution is 0.1856 M.
water
air
multiple cells
a place to live
Answer:
I guess it WATER
How can we find life on other planets?
Through satellites...
Help me I’m struggling with this one
Answer:
Eukarya
Explanation:
It's larger than a prokaryotic cell and it has a nucleus.
Help plzz pick on the picture
The worst feeling is when you are hurting so badly inside but not a single tear comes out.
Anyone relate?
I know i can.
Answer:
chemistry wow
Explanation: