Answer:
the answer is c I tink good luck
Answer:
C. Warm surface water is reduced, causing colder conditions than normal.
Explanation:
During El Niño, trade winds are weak. During La Niña, it's the opposite. The surface winds across the entire tropical Pacific are stronger than usual, and most of the tropical Pacific Ocean is cooler than average. Rainfall increases over Indonesia (where waters remain warm) and decreases over the central tropical Pacific
Help it is easy I think
Why must scientific investigations be replicable?
A ) to prove the reliability of the results
B)to confirm ideas and theories
C)to prove its validity within the scientific community
D)to improve the investigation each time
Answer:a
Explanation:
Answer:
Answervis A.
Explanation:
Because,so that other scientists can validate the results.
I hope it's helpful!
Which would
have more
particles:
1 mole Au or
1 mole Ag?
Answer:
1 mole of each element have same number of particles. i.e. 6.02×10^23
Explanation:
So both have same atoms
According to the concept of Avogadro's number, there are same number of particles in 1 mole of silver and gold.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
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how does heat transfer into conduction
Explanation:
Heat is transferred by conduction when adjacent atoms vibrate against one another or electrons move from one atom to another . Conduction is the most significant meanings of heat transfer within a solid or between solid objects informal contact.
Which compound has the most hydrogen atoms?
A. NaOH B. C2H4O C. H3PO4 D. (NH3)2SO4
Construct your RNA chain from the following sequence of DNA: GGCTTACGGTAA.
The Answer to this question is CCGAAUGCCAUU
Answer:
GGCTTACGGTAA. = CCGAATGCCATT
Explanation:
.
Draw the reactants and complete the mechanism by drawing in the appropriate electron-flow arrows (including stereochemistry) for the following SN2 reaction of an alkyl bromide. Represent the nucleophile as an ion. Draw all missing reactants and/or products in the appropriate boxes by placing atoms on the grid and connecting them with bonds, including charges where needed. Indicate the mechanism by drawing the electron-flow arrows on the molecules. Arrows should start on an atom or a bond and should end on an atom, bond, or where a new bond should be created.
Answer:
Wow I don't that hhehehe sorry
A piston is filled with 80.4 liters of chlorine gas, Cl (8), at standard temperature and pressure (STP.) What is the mass of chlorine in the
piston?
The molar mass of Cl2(g) is 70.9 g/mol.
Type your answer
Answer:
Mass = 19.85 g
Explanation:
Given data:
Volume of chlorine gas = 80.4 L
Temperature = standard = 273.15 K
Pressure = standard = 1 atm
Mass of chlorine = ?
Molar mass of chlorine gas = 70.9 g/mol
Solution:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
By putting values,
1 atm × 80.4 L = n× 0.0821 atm.L/mol.K × 273.15 K
80.4 atm.L = n× 22.43 atm.L/mol
n = 22.43 atm.L/mol / 80.4 atm.L
n = 0.28 mol
Mass of Cl₂:
Mass = number of moles × molar mass
Mass = 0.28 mol × 70.9 g/mol
Mass = 19.85 g
What is the formula for this
ionic crystal?
The ionic formula for the ionic crystal is Fe₃O₂
Ionic crystals are solid, crystalline ionic substances that are made up of ions linked together in a regular lattice structure by electrostatic attraction.
From the given structure; the key element shows that:
Fe is denoted by the red electrons, andO is denoted by the blue electronsTherefore, from the diagram, the correct formula of the ionic crystal by considering the lone pairs and valence electrons is Fe₃O₂
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please help the anion , cation , neither is the options. for all of them
Answer:
Cation
Anion
Cation
Cation
Explanation:
If an atom, or atoms, has a balanced number of electrons (negative charge) and protons (positive charge) they are neutral overall. However, if they are not balanced, they will be charged. These charged species are called ions.
What is an anion?
An anion has more electrons than protons, consequently giving it a net negative charge. For an anion to form, one or more electrons must be gained, typically pulled away from other atoms with a weaker affinity for them. The number of electrons gained, and so the charge of the ion, is indicated after the chemical symbol, e.g. chlorine (Cl) gains one electron to become Cl-, whilst oxygen (O) gains two electrons to become O2-.
What is a cation?
A cation has more protons than electrons, consequently giving it a net positive charge. For a cation to form, one or more electrons must be lost, typically pulled away by atoms with a stronger affinity for them. The number of electrons lost, and so the charge of the ion, is indicated after the chemical symbol, e.g. silver (Ag) loses one electron to become Ag+, whilst zinc (Zn) loses two electrons to become Zn2+.
Source: Cation vs Anion: Definition, Chart and the Periodic Table By
Karen Steward (PhD)
Universe L, recently discovered by an intrepid team of chemists who also happen to have studied interdimensional travel, quantum mechanics works just as it does in our universe, except that there are seven d orbitals instead of the usual number we observe here. Use these facts to write the ground-state electron configurations of the sixth and seventh elements in the first transition series in Universe L.
Answer:
Iron; [Ar] 3d6 4s2
Cobalt; [Ar] 3d6 4s2 4p1
Explanation:
We know that in our universe, there are five d orbitals known. However, in this strange universe L, there are only three d orbitals known.
The sixth and seventh first row transition elements are iron and cobalt. In universe L, the electronic configuration of iron and cobalt will be written as;
Iron; [Ar] 3d6 4s2
Cobalt; [Ar] 3d6 4s2 4p1
Please help immediately it’s due today
how does the muscular sytem/muscles help with walking
pls asnwer asap
Answer:
they work with the skeletal system and joints to expand and contract, making a motion.
Explanation:
muscles in your knee pull, then release. do that again and again, and you'll be walkin
Answer:
You're able to walk because of your skeletal muscles
Explanation:
Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
Hope this helps :)
Name the following ionic compounds. Use the periodic table, the table of common polyatomic ions, and
the transition metal charges chart found here.
Al₂O3:
I
Name
Formula and
Charge
DONE
Ammonium
NH4
Hydroxide
OH
Nitrate
Carbonate
NO3-
CO32-
SO,2-
PO, 3-
Sulfate
Phosphate
Answer: aluminum oxide
Explanation:
Answer:
aluminum oxide
Explanation:
Please help me with this
Answer:
D
Explanation:
compound 1 probably ether and compound 3 1-bromo ethane have 2 carbon atoms
To carry out the synthesis of hydrogen fluoride from hydrogen and difluorine, 1.0 mol of H,
and 2.0 mol of F2, are mixed in a flask having a 3.0 L capacity. The equilibrium constant for
this synthesis reaction and at a certain temperature is equal to 115.
Calculate the concentration at equilibrium of each of the components of the reaction system.
Answer:
this not easy
Explanation:
come on
What is the process called to prepare a ceramic by heating a slurry of a powder of an inorganic substance in water to a very high temperature under pressure
Answer: The process that is used to prepare ceramic is sintering.
Explanation:
Sintering is defined as the process in which number of particles are fused together to form one solid mass by the applying pressure at high temperatures.
Ceramic is an material that is made by taking mixtures of clay, earthen elements, powders and water.
When this mixture (slurry of the powders) is heated at a very high temperature and under high pressure, ceramic is formed.
Hence, the process that is used to prepare ceramic is sintering.
Which of these happens when the warm water gets to the North and South Poles
Answer:It creates a heat source on the cold water and the molecules act against each other and then it becomes steam.
Explanation:I had to take this on a test.
Can some please answer these two questions?
Answer:
1. Mass of potassium (K) = 203.32 g
2. Number of mole of As = 7.53 moles
Explanation:
1. Determination of the mass of potassium (K)
Molar mass of K = 39.1 g/mol
Number of mole of K = 5.2 moles
Mass of K =.?
Mole = mass / Molar mass
5.2 = mass of K / 39.1
Cross multiply
Mass of K = 5.2 × 39.1
Mass of potassium (K) = 203.32 g
2. Determination of the number of mole of Arsenic (As)
Molar mass of As = 74.92 g/mol
Mass of As = 563.9 g
Number of mole of As =.?
Mole = mass /Molar mass
Number of mole of As = 563.9 / 74.92
Number of mole of As = 7.53 moles
C2H5OH + 302 →2C02 + 3H20, what is the mole ratio
of ethanol to water?
The mole ratio of ethanol to water : 1 : 3
Further explanationGiven
Reaction
C2H5OH + 302 →2C02 + 3H20
Required
The mole ratio
Solution
In a chemical reaction equation, the mole ratio of the reacting compound (reactants or products) is indicated by the reaction coefficient
The reaction coefficient is determined from the number of elements reacting by holding the principle that the number of elements in the reactants is equal to the number of elements in the product
In the above reaction, the ethanol-C2H5OH coefficient is 1 while the reaction coefficient of water-H20 is 3 so that the mole ratio = 1: 3
The end point indicates the completion of the titration by physical change (which is
usually color change)*
True
False
How many molecules are contained in 103.4g of sulfuric acid?
1.827 × 10²⁴ molecules H₂S
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Compounds
Writing CompoundsAcids/BasesAtomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
103.4 g H₂S (Sulfuric Acid)
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of H₂S - 2(1.01) + 32.07 = 34.09 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 103.4 \ g \ H_2S(\frac{1 \ mol \ H_2S}{34.09 \ g \ H_2S})(\frac{6.022 \cdot 10^{23} \ molecules \ H_2S}{1 \ mol \ H_2S})[/tex]Multiply: [tex]\displaystyle 1.82656 \cdot 10^{24} \ molecules \ H_2S[/tex]Step 4: Check
Follow sig fig rules and round. We are given 4 sig figs.
1.82656 × 10²⁴ molecules H₂S ≈ 1.827 × 10²⁴ molecules H₂S
What is mineral deficiency linked to
Answer:
Mineral deficiencies can lead to a variety of health problems, such as weak bones, fatigue, or a decreased immune system.
Explanation:
There are five main categories of mineral deficiency: calcium, iron, magnesium, potassium, and zinc.
One major cause of mineral deficiency is simply not getting enough essential minerals from food or supplements.
Answer:
it can lead to a variety of health problems, such as weak bones, or a decreased immune system.
Explanation:
If a solution has equal numbers of hydronium
and hydroxide ions, what is its pH?
ANSWER NOWW PLS I NEED HELP
Answer:
neutral!
pH = 7
Explanation:
⁄(⁄ ⁄•⁄ω⁄•⁄ ⁄)⁄
is volcanoes eruption rapid change or slow change
Answer:
Fast change
Explanation:
Weathering, erosion, and deposition are examples of slow change. Earthquakes, erupting volcanoes, and landslides happen fast. Therefore, they can change the Earth's surface very quickly.
Calculate the number of molecules in 0.5 mol of sulfur dioxide, SO2.
Describe what is meant by a mole of sodium atoms. I need answers ASAP
We know, 1 mole of any element/compound contains 6.022 × 10²³ atoms/molecules .
Now, we have to calculate the number of molecules in 0.5 mole of sulfur dioxide, SO₂.
So, number of molecules of SO₂ in 0.5 mole is :
[tex]n = 0.5\times 6.022\times 10^{23}\\\\n = 3.011\times 10^{23}[/tex]
Therefore, number of molecules in 0.5 mole of SO₂ is 3.011 × 10²³.
Consider the procedures in a simple experiment used to demonstrate the behavior of gases
1 Remove the end cap from the tip of a 35-ml plastic syringe.
2. Remove plunger from the syringe and insert a balloon into the syringe,
3. Place plunger back in syringe so the volume reading is approximately at the 15-mi mark
4. Using a finger, seal the the syringe,
5. Pull the plunger out
Select ALL of the statements that help to explain what occurs once the plunger is pulled out.
A)
The pressure inside the balloon increases
B)
The pressure inside the syringe chamber decreases
C)
The lower pressure on the balloon causes its volume to increase
D)
When the syringe plunger is pulled out, the amount of gas increases,
E)
When the syringe plunger is pulled out, the volume of the chamber
increases
Answer:
B, C, E
Explanation:
did usatestprep
When the plunger is pulled out, pressure inside syringe decreases, lower pressure on balloon causes volume to increase,volume of the chamber also increases.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
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When (R)-6-bromo-2,6-dimethylnonane is dissolved in CH3OH, nucleophilic substitution yields an optically inactive solution. When the isomeric halide (R)-2-bromo-2,5- dimethylnonane is dissolved in CH3OH under the same conditions, nucleophilic substitution forms an optically active solution. Draw the products formed in each reaction, and explain why the difference in optical activity is observed.
Answer:
See explanation
Explanation:
The nucleophile here is CH3OH. We know that CH3OH is a good nucleophile that promotes SN2 reanction. However, (R)-6-bromo-2,6-dimethylnonane is a tertiary alkyl halide so the reaction proceeds by SN1 mechanism. This means that a racemic mixture is obtained at the end of the reaction because the attack occurs at the stereogenic carbon atom (6R) hence the product is optically inactive.
On the other hand, when (5R)-2-bromo-2,5-dimethylnonane is reacted with CH3OH, an optically active product is obtained because; though a tertiary alkyl halide and reaction occurs by SN1 mechanism, the attack does not occur at the stereogenic carbon atom (5R). Therefore, an optically active product is obtained in this case.
BY ANSWERING THIS QUESTION UR PUTTING IT ON UR MOM's LIFE THAT U WON'T STEAL MY POINTS.
5) Choose the best answer.
Using Gay-Lussac's Law, calculate the new temperature in the following situation.
A sample of gas has a pressure of 3.50 atm and a temperature of 22°C. If the pressure decreases to 1.75 atm, what will be its Celsius temperature if the volume remains constant?
125.5* C
-125.5* C
-147.5* C
-195* C
195* C
6) Choose the best answer.
Using Gay-Lussac's Law, calculate what the new pressure in the following situation.
A tank of acetylene sits on the back of a truck. During the afternoon, the temperature of a gas has reached 38°C (311 K) with a pressure of 508 kPa. That night, the temperature drops to 29°C (302 K). Since the gas was in a metal tank, the volume remained constant. What is the new pressure?
308 kPa
500 kPa
493 kPa
503 kPa
311 kPa
Answer:
[tex]T_2=-125.58\°C[/tex]
Explanation:
Hello!
In this case, considering the Gay-Lussac's law which describes the pressure-temperature behavior as a directly proportional relationship by holding the volume as constant, we write:
[tex]\frac{T_1}{P_1} =\frac{T_2}{P_2}[/tex]
Whereas solving for the final temperature T2, we get:
[tex]T_2=\frac{T_1P_2}{P_1}[/tex]
Thus, we plug in the given data (temperature in Kelvins) to obtain:
[tex]T_2=\frac{(22+273.15)K*1.75atm}{3.50atm} \\\\T_2=147.58K-273.15\\\\T_2=-125.58\°C[/tex]
Best regards!
Choose the correct statement for this question: If two objects have different temperatures, in which direction will heat move? For how long?
1. Heat moves from hot to cold objects/areas, and it never stops.
2. Heat moves from cold to hot object/areas.
3.Heat moves from hot objects/areas to cold areas and stops moving once it reaches a thermal equilibrium.
What is the surface area of the rectangular prism below? 7 7 14
Answer:
A=490
Explanation:
Hope this helps :)
Right rectangular prism
Solve for surface area
A=490
l Length
7
w Width
7
h Height
14
h
l
w
d
l
l
h
w
h
w
Solution