Answer:
The electronic configuration of iron is: Ar3d64s2. the two electrons in the 4s orbital are paired, and two of the electrons in the 3d orbitals are paired leaving four unpaired electrons. In general when you are populating the p, d, f, etc
Explanation:
hope dis help
3
What is compression?
A
When alr molecules move apart from one another.
B
When alr molecules collide with one another.
C
When alr molecules become packed tightly together.
D
When alr molecules move around freely.
Describe how the particles are arranged in a solid, liquid, and gas.
Answer:
Particles in a: gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
Please help me with questions 43, 44, and 45
In a covalent bond:
A. None of these.
B. One atom accepts electrons from another.
C. The atoms attract each other but their electrons do not interact.
D. Both atoms share their electrons.
Answer:
D. Both atoms share their electrons.
Explanation:
why is it necessary to specify temperature when giving Ka value
Answer:
Because the equilibrium constant is only at constant at temperature. Changing the temperature changes the Ka.
Scientists often repeat experiments multiple times.
Why is this important?
A.
Repeating an experiment helps to verify the results.
B.
Repeating an experiment turns a hypothesis into a theory.
C.
Repeating an experiment allows scientists to test different variables.
D.
Repeating an experiment gives scientists something to do while they think of new hypotheses.
Answer:
A
Explanation:
Hi! The reason scientists often experiments multiple times is because repeating an experiment helps to verify the results.
Calculate the mass of 5.22 mol of He.
Answer:
The mass is 20, 89 grams of He.
Explanation:
We calculate the weight of 1 mol of He, from the atomic weight of each element obtained from the periodic table: Weight 1 mol He= 4, 0020602 g. 1 mol He-----4, 0020602 g. 5,22 mol He---x= (5,22 mol He x4, 0020602 g)/ 1 mol He= 20, 89 g
hope this helps also can i get brainliest
The mass of 5.22 mol of He will be 20.84 grams.
We have 5.22 mol of He.
We have to calculate its Mass.
Which element is represented by symbol He ?Helium is a chemical element with the symbol He and atomic number 2. It is a gas which is colorless, odorless, tasteless, non-toxic, inert and monatomic.
According to the question -
Number of moles of Helium = 5.22 mol
Now, I mole of Helium will have its mass equal to its Atomic weight. Therefore -
Mass of 1 mole of He = 4.002602 g
So, the mass of 5.2 mol of He will be = 5.2 x 4.002602 = 20.84 grams
Hence, the mass of 5.22 mol of He will be 20.84 grams.
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HNO3 + H2SO4 + NO
You now have these half-reaction equations:
3e + HNO3 → NO
S→ H2SO4 + 6e
Which factor will you use for the top equation?
Which factor will you use for the bottom equation?
Explanation:
The two half equations are;
3e + HNO3 → NO
S→ H2SO4 + 6e
When balancing half equations, we have to make sure the number of electrons gained is equal to the number of electrons lost.
Which factor will you use for the top equation?
We multiply by 2 to make the number of electrons = 6e
Which factor will you use for the bottom equation?
We multiply by 1 to make the number of electrons = 6e
Answer:
2
1
Explanation:
How many moles of gas are in a 30 liter compressed air tank if the
temperature of the tank is 300K and the pressure is 200 atmospheres? *
Answer:
B
Explanation:
Which of the following describes an exothermic reaction?
An exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.
What is Exothermic reaction?The word exothermic means “releasing heat.” Energy, often in the form of heat, is released as an exothermic reaction proceeds.
Enthalpy of a reaction is defined as the heat energy change (Δ H) that takes place when reactants go to products. If heat is absorbed during the reaction, Δ H is positive; if heat is released, then Δ H is negative.
ΔH value negative –> energy released –> exothermic reaction
ΔH value positive –> energy absorbed –> endothermic reaction
Therefore, an exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.
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Describe the effect of resonance on the amount of rotation that can occur in the main chain of your tripeptide (phenylalanine, alanine, and tyrosine), which affects protein folding.
Answer:
use research.
Explanation:
chemistry help please!!
Answer:
no so boring........................
As the temperature of a gas is increased, the average kinetic
energy of its molecules
Answer:
Increases.
Explanation:
Temperature is the measure of the average kinetic energy of a system. As temperature increases, so will kinetic energy. As kinetic energy increases, speed increases.
Which of the following best defines base isolation?(1 point)
Base isolation is a technique used by engineers to help prevent damage to buildings by volcanoes. The main structure of the building is separate from the base, which allows lava to pass under the building without causing much damage.
Base isolation is a technique used to prevent large-scale damage from volcanoes. New communities being built are set as far back as possible from the base of a volcano.
Base isolation is a technique used to prevent damage to buildings during tsunamis. The main structure of the building is separate from the base, which allows water to pass beneath buildings without causing much damage.
Base isolation is a technique used by engineers to help prevent damage to buildings by earthquakes. The main structure of the building is separate from the base and sits on a bed of springs.
Base isolation is a technique used by engineers to help prevent damage to buildings by earthquakes. The main structure of the building is separate from the base and sits on a bed of springs.
What is base isolation?Base isolation is a technique developed to prevent or minimise damage to buildings during an earthquake.
A base isolation system is a method of seismic protection where the structure (superstructure) is separated from the base (foundation or substructure). By separating the structure from its base the amount of energy that is transferred to the superstructure during an earthquake is reduced significantly.
Hence, option D is correct.
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is h2o a pure element or a compound
I can't leave till I answer please help!!
Answer:
The answer is 2 all you do is divide the 6.02 and 3.01 and you get 2
A student wants to make 50-mL of a 0.6 mg/L solution of acetic acid. She will be making the solution by diluting a stock with a concentration of 2.0 mg/L. Put the steps for her dilution in order. 4. Cap the flask and invert several times to mix. 2. Fill the volumetric flask with deionized water until the meniscus touches the mark. 6. Swirl the flask to mix the contents. 1. Obtain a 50-mL volumetric flask. 3. Use a pipet to add the appropriate volume of stock solution to the flask. 2. Add approximately 10 mL of deionized water to the empty flask.
Answer:
The steps in order are;
1. Obtain a 50-mL volumetric flask
2. Add approximately 10 mL of deionized water to the empty flask
3. Use a pipet to add the appropriate volume of stock solution to the flask
4. Cap the flask and invert several times to mix
5. Fill the volumetric flask with deionized water until the meniscus touches the mark
6. Swirl the flask to mix the contents
The volume of the acetic acid to be added to the solution is 15 mL
Explanation:
The given steps are;
4. Cap the flask and invert several times to mix
5. Fill the volumetric flask with deionized water until the meniscus touches the mark
6. Swirl the flask to mix the contents
1. Obtain a 50-mL volumetric flask
3. Use a pipet to add the appropriate volume of stock solution to the flask
2. Add approximately 10 mL of deionized water to the empty flask
The given parameters are;
The volume of the volumetric flask = 50-mL
The concentration of the final solution of acetic acid = 0.6 mg/L
The concentration of the stock solution = 2.0 mg/L
Let 'x' represent the volume of the stock solution added, we have;
2.0 mg/L·x + (50 - x)×0 = 0.6 mg/L × 50-mL
x = 0.6 mg/L × 50-mL/(2.0 mg/L) = 15 mL
The volume of the stock solution to be added, x = 15 mL
How many Protons, Electrons, and Neutrons are there in Oxygen
Answer:
Name Oxygen
Atomic Mass 15.999 atomic mass units
Number of Protons 8
Number of Neutrons 8
Number of Electrons 8
Explanation:
Which industry would most likely be affected if coal recourses were depleted.
1.Power production
2.Transportation
3.construction
Calculate the volume occupied by 2.00 moles of H₂ at 300.0 K and 1.25 atm
Answer:
V = 39.38 L
Explanation:
Given that,
No. of moles of H₂, n = 2
Temperature, T = 300 K
Pressure, P = 1.25 atm
We need to find the volume occupied by the gas. We can use the ideal gas law to find it such that,
[tex]PV=nRT[/tex]
Where
R is gas constant, R = 0.08205 L-atm/mol-K
V is volume of the gas
Rearranging the above formula for V. So,
[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{2\times 0.08205\times 300}{1.25}\\\\V=39.38\ L[/tex]
So, the volume occupied by the gas is 39.38 L.
The compound that forms between nitrogen and chlorine is
a. ionic
b. molecular/covalent
Answer:
Covalent bonding is a type of chemical bonding which is characterized by atoms sharing electrons. For nitrogen and chlorine to covalently bond, nitrogen needs 3 electrons. Chlorine only has one electron therefore two more chlorine molecules are needed. Because one atom of nitrogen needs 3 atoms of chlorine to bond, the formula will be NCl3.
Matching
Enter the letter of the box whose contents best match the description.
8
8
8
a
b
с
e
f
v a mixture of molecules
atoms of a pure elementa metal
molecules of an element
va solid compound
a mixture of elements
a. box a
b. box e
c. box b
d. box f
e. box d
f. box c
QUESTION 10
Answer:
a mixture of molecules - Box f
atoms of a pure elementa metal - Box D
a solid compound - Box C
a mixture of elements - Box A
Explanation:
Box a has mixture of elements which forms a solid like shape but there are different elements present in the box. The box f has mixture of molecules in which many atoms are combined together. Box c has solid compound with single element.
True or false: Breaking down water into the elements hydrogen and oxygen is an example of a chemical change.
Answer:
True.
Explanation:
When water is decomposed into hydrogen and oxygen, chemical bonds are broken, chemical energy is released, and two new substances are formed from one.
A gardener cut her finger while pruning shrubs. She noticed that after two weeks the wounds had nearly healed with just a small scar remaining. Which statement describes what will happen next?
A. Each one of the individual cells near the wound will grow in size to cover the injured part.
B. Cells will be transported from distant areas to the wound to cover the injured area.
C. The cells near the wound will produce identical cells by mitosis to repair the damaged tissues.
D. A material will be released by the injured cells that will cover the wound and repair the cells.
Answer:
c
Explanation:
The wound will be healed by the production of new cells near the wound by the cell replication process and the therefore the identical cells are produced by the mitosis to repair the damaged tissues.
Note the below points about mitosis;
The mitosis is a process in which the cell replication occurs.In mitosis, the single parent cell is divided into two identical daughter cells by the process of cell division, it takes by time.The mitosis involves the healing of wound, growth of the organisms, replacement of the worn out cells.Thus, mitosis is the process involved in the healing of wound in living beings.
Therefore, we can say that the answer of the question is C. The cells near the wound will produce identical cells by mitosis to repair the damaged tissues.
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Gases Test
Chemistry
Answer:
6.64 l is the answer.......
In an isolated system, mass can neither be
created or destroyed.
ube
FALSE
TRUE
Answer:
True
Explanation:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Hope it helps
CAN SOMEBODY PLS HELP...
Answer:
Maybe you could do something with nuclear power plants and how we use those to create electrical energy for our phones, houses etc?
Variables – this experiment tests how the temperature of water affects the time it takes for antacid tablets to dissolve. (they drop an antacid in hot water and one in cold water)
• What is the independent variable? (2 points)
• What is the dependent variable? (2 points)
Explanation:
You can think of independent and dependent variables in terms of cause and effect: an independent variable is the variable you think is the cause, while a dependent variable is the effect. In an experiment, you manipulate the independent variable and measure the outcome in the dependent variable.
“Nature vs. nurture” is a debate about
A
whether a trait is learned or inherited.
B
the traits of plants vs. the traits of animals.
с
whether animals can teach humans new traits.
D
whether a trait was acquired outdoors or indoors.
Answer:
Letter A
whether a trait is learned or inherited
Explanation:
The nature versus nurture debate involves the extent to which particular aspects of behavior are a product of either inherited (i.e., genetic) or acquired (i.e., learned) influences. Nature is what we think of as pre-wiring and is influenced by genetic inheritance and other biological factors.
The debate called Nature vs. nurture is about whether a trait is learned or inherited. This is an investigation on learned traits and nurtured traits in humans. Thus option A is correct.
What are learned traits ?All living things are learning something during their growth. These learning mold up one's personality and cannot be created by birth. Like the good characteristics we are learning from schools. These behaviors are called learned traits.
Some traits or behaviors are created by birth itself and they are called natural traits. The nature versus. nurture debate is a philosophical, scientific, and cultural discussion about whether human culture, conduct, and personality are largely influenced by nature or nurture.
Environment, culture, and experience are the most prominent definitions of nurture in this discussion, whereas nature is frequently regarded as genetic or hormone-based behaviors, characteristics, and dispositions.
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Who coined the term "ridgeology"?
Answer:
David R. Ashbaugh
Explanation:
David R. Ashbaugh is a Canadian police officer known for his extensive research on the friction ridge identification, introducing for the first time the use of the term ridgeology in forensic identification and the ACE-V methodology.