Answer:
2-7
Explanation:
Which of the following describes the skill level of a graduate of a doctorate program?
O expert
O competent
O novice capable
Answer:expert
Explanation:
At 390 K, the pressure of a sample of nitrogen is 2.07 atm. What will the
pressure be at 480 K
Answer:
190k 100 on the test
Explanation:
A block of an unknown metal with a mass of 47 g is cooled from 65 °C to 20 °C with a
release of 533 J of heat. From these data, calculate the specific heat of the unknown
metal. (Round to 2 decimal places)
Answer:313
Explanation:Hope its rught or i calculated wrong
Please help, due soon!
Different stimuli create various reactions in our bodies. Name the three types of stimuli. For two of these, give an example.
Answer:
three types of stimuli consists of
Mechanical,
thermal,
and chemical.
Explanation:
I really hope this helps have an amazing day, dont forget YOU ARE WORTH IT
4. How many moles of Ca(HCO3)2 are present in 4.6 liters of a 3.5 molarity
solution?
Question Megan made a model of the respiratory system using a water bottle and balloons. When she pulled down on the balloon stretched across the bottom of the bottle, the balloon hanging inside the bottle inflated. What organ does the balloon hanging inside the bottle represent?
Answer:
The lung
Explanation:
The model of the respiratory system made by Megan consists of two balloons. The first balloon stretched across the bottom of the bottle represents the diaphragm which contracts and relaxes to allow air in and out of the lungs. The balloon inside the bottle represents one lung.
Breathing in causes the balloon inside the bottle to be filled with air. This is preceded by the expansion of the diaphragm which makes the lungs to be filled with air. Breathing out causes a contraction of the diaphragm thus making the lungs to let out air.
Answer:
You're Lungs
Explanation:
When you breathe in, air flows into your lungs. When you breathe out, air flows out of your lungs. The balloon inside the bottle is like one of your lungs.
What volume is occupied by 18.4 g oxygen at 28.0°C and a pressure of 0.998 torr? (round to sig figs)
Answer:
11.0 dm³
Explanation:
From the question,
Applying
PV= nRT............... Equation 1
Where P = pressure of oxygen gas, V = volume of oxygen gas, n = number of moles of oxygen, R = molar constant, T = Temperature.
make V the subeject of the equation
V = nRT/P............. Equation 2
But,
Number of mole (n) = Mass of oxygen(m)/Molar mass of oxygen(m')
n = m/m'....................... Equation 3
Substitute equation 3 into equation 2
V = mRT/Pm'............. Equation 4
Given: T = 28°C = (28+273) = 301 K, P = 0.998 torr = (0.998×0.00131579) = 1.3132 atm, m = 18.4 g
Constant: R = 0.082 atm.dm³/K.mol, m' = 32 g/mol.
Substitute these values into equation 4
V = (301×18.4×0.082)/(32×1.3132)
V = 454.1488/42.0224
V = 10.81 dm³
V = 11.0 dm³
Can someone help me out with why is the outer core of Earth is important in you’re own words?! A mini paragraph plsss
Answer:
the outer core is important because the outer core is responsible for earth's magnetic field which protects earth from harmful particles that comes from sun and also contains some natural metal like nikle and iron.
is this much paragraph enough comment down below..
hope this helps you ☺️☺️
Students investigating chemical reactions conducted the experiment you see here. An antacid tablet was dropped into a plastic bag containing 10 ml distilled water at 22oC. The bag was immediately zipped closed and the chemical reaction proceeded until completion. Based on your knowledge of chemical reactions, choose all of the statements below would apply?
A) the tablet completely disappeared.
B) The total mass at the completion of the experiment is 16.72g.
C) The mass of the products is slightly less than the mass of the reactants.
D) A decrease in the mass of the products in the result of the production of a gas.
E) Evidence of a chemical reaction includes the production of something new: a gas
Answer: B and E
Explanation:
The chemical reactions are all around us. Here for the given reaction the tablet completely disappeared and evidence of a chemical reaction includes the production of something new: a gas. The correct options are A and E.
A chemical reaction is defined as the reaction in which the bonds are broken within the reactant molecules and the new bonds are formed within the product molecules. In a chemical reaction the compounds interact to form new substances called products.
In a chemical reaction, a chemical change must occur which is generally observed with precipitation, heat formation, etc.
Thus the correct statements are options A and E.
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How can you provide a better explanation of what was happening that made the pie pans fly off the Van de Graaff generator?
Answer:
Due to repulsion.
Explanation:
Repulsion among electrons is responsible for fly off the pie pans from the Van de Graaff generator. When the globe of the generator charges up, the charge will move to the top part of the pie tin. The top region of pie tin accumulates charge and since it is not fixed at one place like upper half of the globe itself, it will be repelled by electrostatic forces between electrons that leads to fly off so we can say that similar charge of electrons is responsible for this fly off.
Examine the model of a metallic bond.
What do the smaller circles represent?
o the cations held in place by the attractive forces within the sea of electrons
O the delocalized electrons that are free to move around the positive cations
the distinct and rigid bond between the different metal atoms
the unshared pairs of electrons of the metal atoms involved in the metallic bond
Answer:
b the delocalized
Explanation:
it could be the right answer
Which resource is renewable?
Plastic bottles of various sizes.
Dry, brown beans.
A silver bar on top of a gold bar.
Answer:
pinto beans!!
Explanation:
correct on edge
The pen on seismograph swings freely.
What is the [OH-] in a solution that has a pH = 9.23? *
O 1.7x10^5
O 8.2x10^-9
1.7x10^--5 M.
Answer: 1.7x10^-5
Explanation:
pH + pOH = 14
14 - pH = pOH
14 - 9.23 = 4.77
pOH =4.77
[OH-] = 10^-pOH
= 10^-4.77
= 1.698243x10^-5
= 1.7x10^-5
How do you make crack and what are its effects?
If anyone is taking Integrated Physics and Chemistry (2014) on sos can u pls help me w something !! Thanks
I am so sorry i cant help but good luck
PLS HELP WILL GIVE BRAINLYEST!!!!!!!!!!!!!!!!!! PLS HELP ME
Key Questions and Terms
What is matter?
Matter is composed of tiny particles called ______.
What is the difference between states of matter and phases of matter?
What are the characteristics of the three states of matter?
Solid:
Liquid:
Gas:
What causes matter to change states?
What is temperature? What instrument is used to measure temperature?
What happens when two substances of different temperatures come in contact with each other?
What happens when a substance moves below its freezing point? What happens when it moves above its boiling point?
A change of state from solid to liquid is called ___________.
What is the difference between vaporization and evaporation?
What is an example of sublimation?
What is an example of condensation?
During a phase change, the temperature remains ________. After the change of state occurs, the temperature ________.
Describe the three methods of thermal energy transfer:
Conduction:
Convection:
Radiation:
What are electromagnetic waves?
What are some examples of conductors and insulators?
What are the characteristics of conductors and insulators?
How does thermal energy affect different materials?
Answer:
HOPE I HELPED!
PLZ GIVE BRAINLIEST!
Matter is composed of tiny particles called _Atoms and molecules_.
What is the difference between states of matter and phases of matter? -The difference between states of matter and phases of matter is that the state of matter is the state of a particular compound in a physical system whereas phase is a set of states within such a system.
Solid: The solid state is one of the fundamental states of matter. Solids differ from liquids and gases by the characteristic of rigidity.
Liquid: The molecules in a liquid are closely packed due to weak intermolecular forces. These forces are weaker than solids but stronger than that of gases.
Gas: Molecules floating all over the place
What causes matter to change states? - Changing states of matter occur when matter loses or absorbs energy.
What is temperature? - The degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
What instrument is used to measure temperature? - Thermometers
What happens when two substances of different temperatures come in contact with each other? - When two substances having different temperatures are introduced or kept together, heat energy flows from a substance at higher temperature to a substance at lower temperature.
What happens when a substance moves below its freezing point? - Evaporation can take place below the boiling point of a substance.
What happens when it moves above its boiling point? - Boiling is the process by which a liquid turns into a vapor when it is heated to its boiling point.
A change of state from solid to liquid is called _melting___.
What is the difference between vaporization and evaporation? - Vaporization is the process of conversion of solid or liquid into gaseous form while evaporation is the change of a liquid into gaseous form.
What is an example of sublimation? - Vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature.
What is an example of condensation? - Having a cold soda on a hot day, the can "sweats."
During a phase change, the temperature remains __constant__. After the change of state occurs, the temperature _can rise again_.
Describe the three methods of thermal energy transfer:
Conduction: For conduction to take place between two objects, they must be touching each other.
Convection: The circulatory motion that occurs in a fluid at a nonuniform temperature owing to the variation of its density and the action of gravity
Radiation: Radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.
What are electromagnetic waves? - Composition of oscillating electric and magnetic fields.
What are some examples of conductors and insulators? - Many metals, such as copper, iron and steel, are good electrical conductors. That is why the parts of electrical objects that need to let electricity pass through are always made of metal.
What are the characteristics of conductors and insulators? -
An electrical insulator is a material in which the electron does not flow freely or the atom of the insulator have tightly bound electrons whose internal electric charges do not flow freely; very little electric current will flow through it under the influence.
In physics and electrical engineering, a conductor is an object or type of material that allows the flow of charge (electrical current) in one or more directions.
How does thermal energy affect different materials? - Thermal energy affects different materials by the movement of the tiny particles, which transfers from one object to another, aka heat.
Explanation:
What is the potential difference across a light bulb when there is 32 A of current and 8 Ω of resistance from the filament.
Answer:
force ε: the increase in potential energy per unit charge provided by the chemical reactions in the battery. And the voltage difference across the light bulb is: ∆V = I R = (0.06 A)(20 Ω) = 1.2 V ▪If we measure the voltage difference across the battery or the light bulb, we will get 1.2 V.
Explanation:
please mark this answer as brainlest
What type of reaction is this?
Answer:
Decomposition
How many half-lives will pass by the time 1.56% of I-131 is present? B. Approximately how many days does that equal? *
Answer: Hmmmmm that's crazy....
There are a couple of equations one could use for this type of problem, but I find the following to be the easiest to use and to understand.
Fraction remaining (FR) = 0.5n
n = number of half lives that have elapsed
In this problem, we need to find n and are given the FR, which is 1.56% or 0.0156 (as a fraction).
0.0156 = 0.5n
log 0.0156 = n log 0.5
-1.81 = -0.301 n
n = 6.0 half lives have elapsed
Explanation:
Just wanted to help. Hopefully it's correct wouldn't want to waster your time ;)
this refers to the speed of an object at a specific moment in time
Answer:
Instantaneous speed is the speed of an object at a specific moment in time
What is the molarity of a solution which contains 0.80 mol of HCl in 250mL of
solution?
Answer:
3.2M HCl Solution
Explanation:
Molarity = moles of solute / volume of solution expressed in liters
moles of solute = 0.80 moles HCl
volume of solution = 250 ml = 0.250 Liter
Molarity (M) = 0.80 moles HCl / 0.250 Liters = 3.2M HCl Solution
PLEASE HELP ASAP!! 100 PTS!!
Match the environmental stresses to what would happen in the chemical reaction. Think through the path from the carbon cycle - how CO2 is removed from the atmosphere and stored in sinks and then how CO2 is released from sinks and/or produced.
(Picture attached)
Answer:
coz would be equal so you would need co3 instead
Explanation:
Answer:
Explanation:
1. Shift towards products
- Decrease in no. of cars
- Decrease in no. of farms
2. Shift towards reactants
- Decrease in shellfish
- Loss of trees
- Increase in earth's temperature
(b) Why is nitrogen used for storage of semen
in artificial insemination?
Which of the following equations is balanced?
2H2 + O2 + 4H20
4Na + O2 - 2Na20
Fe2O3 + H2 - 2Fe + 3H20
CH4 + O2 - CO2 + H20
Answer:
4Na + O2 - 2Na20Is the balanced equations .
How is ice cream made???? Hurry plsss!!!
Answer:
Milk, cream, milk solids, sugars, modifying agents and flavourings are blended together in stainless steel vats.
The mix is homogenised to create a consistent texture.
The mix is pasteurised by heating at 82-85°C for 15 seconds then cooled to destroy bacteria.
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What pressure will be needed to reduce the volume of 77.4 L of helium at 98.0kPa to a volume of 60.0L?
Answer:
126 kPaExplanation:
The final pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we're finding the final pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
98 kPa = 98,000 Pa
We have
[tex]P_2 = \frac{98000 \times 77.4}{60} = \frac{7585200}{60} \\ = 126420[/tex]
We have the final answer as
126 kPaHope this helps you
How do differences in
electronegativity and molecular shape
make some molecules more able to
absorb heat?
Answer:
So, higher electronegativity helps atoms take more control over shared electrons creating partial negative regions and partial positive regions which result in dipoles that cause polarity. The molecule's polarity will be determined on the negative and positive regions on the outer atoms in the molecule
How many chloride ions are in a 220 grams of calcium chloride?
A)
1.3 x 1026 ions
B)
1.5 x 1028 ions
2.4 x 1024 ions
D)
3.0 x 1023
La
Answer: Hello, There! Your Answer is Below
2.4 x 1024 ions
Explanation:
220 g of CaCl₂ = X moles
Solving for X,
X = (220 g × 1 mol) ÷ 110.98 g
X = 1.98 moles
As,
1 mole contained = 1.20 × 10²⁴ Cl⁻ Ions
Then,
1.98 mole will contain = X Cl⁻ Ions
Solving for X,
X = (1.98 mol × 1.20 × 10²⁴ Ions) ÷ 1mol
X = 2.38 × 10²⁴ Cl⁻ Ions
Hope this Helps!
Have a great DAy!
`August~
2.4 × 1024 chloride ions are in 220 grams of calcium chloride. The correct option is c.
What is the calculation and what are chloride ions?Calculation
220 g of CaCl2 = X moles
Solving for X,
X = (220 g x 1 mol) 110.98 g
X = 1.98 moles
As
1 mole contains = 1.20 x 1024 chloride Ions
Then,
$1.98 mole will contain = X Chloride Ions
Solving for X,
X = (1.98 mol x 1.20 x 1024 lons) ÷ 1mol
X = 2.38 x 10²⁴ Chloride Ions
Chloride Ion is a chlorine anion that fo²²rms the negatively charged part of certain salts, including sodium and hydrogen chloride salts, and is an essential electrolyte located in all body fluids responsible for maintaining acid/base balance, transmitting nerve impulses and regulating fluid in and out of cells.
Chloride is a halide anion formed when chlorine picks up an electron to form an anion.
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When are atoms considered stable?
when they have satisfied the law of conservation of mass naturally or through bonding to obtain
full valence shells
when they have satisfied the octet rule naturally or through bonding to obtain full valence shells
when their valence electrons have "fallen" back to ground state through bonding
Answer:
when they have satisfied the octet rule naturally or through bonding to obtain full valence shells
Explanation:
Generally, most atoms of an element are unstable because they have a void in their electron shell to fill, hence, they need to react with other elements to fulfil this task of octet.
Octet rule states that atoms of elements engage in reactions to form compounds so they can have eight (8) valence electrons in their shell. Noble gases e.g argon, neon etc. are elements that have naturally satisfied this octet rule by possession of 8 valence electrons in their shell. Other elements that do not have this naturally becomes reactive and enter bonding with other atoms to obtain full valence shells.