Mammals will shed much of their fur or hair to help them cool off and maintain their body temperature.
Answer:
the answer is B
Explanation:
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
In 1938, Otto Hahn and Fritz Strassman discovered that uranium nuclei could spit and form smaller nuclei, or different elements.
What process did Hahn and Strassman discover?
A)
combustion
B)
decomposition
C)
fission
D)
fusion
Answer: I believe it’s c
Explanation:
Because during fission the atom often splits into 2+
Why are detergents bad for the environment?
Answer: They are pollutants when they encourage bacterial growth and loss of oxygen in our rivers and streams, they can be the cause of a very unhealthy ecosystem :( kinda sucks tbh
Explanation:
(b) Why is nitrogen used for storage of semen
in artificial insemination?
How does the transfer of matter and energy from one place to another within Earth drive the movements of Earth’s crust and mantle? What is convection?
Answer: Convection currents drive the movement of Earth's rigid tectonic plates in the planet's fluid molten mantle. In places where convection currents rise up towards the crust's surface, tectonic plates move away from each other in a process known as seafloor spreading
HOPE THIS HELPS and please do not go the link that other person tell you to go because he can hack your account and get millions of dollars
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.
It is necessary to develop alternative sources of energy because____.
scientists are uncertain of how long the resources will last.
scientists are certain of how long the resources will last.
only a select group of people have information on our resources.
scientists have estimated how long the resources will last.
Answer:
scientists are uncertain of how long the resources will last.
Explanation:
It is hard to estimate how long certain natural resources will last because they are dependent upon the rate of consumption and other factors. There are many fields of studies going into alternative energy. Since the technology needed for some of these ideas will take time to be developed, alternative sources of energy must be found before the resources we already have run out.
Answer: A. scientists are uncertain of how long the resources will last.
Explanation:
We are looking into many other types such as: Solar, Nuclear, Water, Etc.
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 ;)
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 we see the color violet
Answer:
Violet is scattered most by Earth's atmosphere, but the blue cones in our eyes aren't as sensitive to it. While our red cones aren't good at seeing blue or violet light, they are a bit more sensitive to violet than our green cones.
Explanation:
It was believed that Earth was a stationary object at the center of the universe. All other objects in space were thought
to go around Earth. Which of these is a criticism of this idea?
A)
Years on Earth are regular periods of three hundred sixty five days each
B)
Earth's shadow falling on the moon shows that Earth is actually spherical,
rather than flat
The moon goes around Earth, resulting in different phases of the moon
that can be seen from Earth
D
There are four seasons on Earth only because Earth is tilted at its axis and
it goes around the sun
Answer: A) years on Earth are regular periods of three hundred sixty five days each
The criticism of the given idea is that there are four seasons on Earth only because Earth is tilted at its axis and it goes around the sun.
What are seasons?A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. On Earth, seasons are the result of the axial parallelism of Earth's tilted orbit around the Sun. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to undergo hibernation or to migrate, and plants to be dormant.
The Northern Hemisphere experiences most direct sunlight during May, June, and July, as the hemisphere faces the Sun. The same is true of the Southern Hemisphere in November, December, and January. It is Earth's axial tilt that causes the Sun to be higher in the sky during the summer months, which increases the solar flux.
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How do you make crack and what are its effects?
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
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
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:
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.
4. How many moles of Ca(HCO3)2 are present in 4.6 liters of a 3.5 molarity
solution?
A laboratory technician drops a 0.0850 kg sample of unknown material, at a temperature of 100.0∘C, into a calorimeter. The calorimeter can, initially at 19.0∘C, is made of 0.150 kg of copper and contains 0.200 kg of water. The final temperature of the calorimeter can is 26.1∘C. Compute the specific heat capacity of the sample.
Answer:
the specific heat capacity of the sample is 1011.05 J /kg k
Explanation:
The computation of the specific heat capacity of the sample is shown below:
Given that
Q=mcΔθ
Now Heat gain by the calorimeter is
= (0.200)× (4180) × (26.1 - 19) + (0.15) × (390) ×(26.1 - 19)
=6 350.95J
Now
6350.95=(0.0850) × c ×(100-26.1)
c= 6350.95 ÷ ((0.085) × (100 - 26.1))
= 1011.05 J /kg k
Hence, the specific heat capacity of the sample is 1011.05 J /kg k
5.(06.04B MC)
In the following reaction, if you wanted to produce more hydrochloric acid (HCI), what should you do?
4HCI + O2 = 2H2O + Cl2 (2 points)
Add more H2O
Add more O2
Remove H20
Remove Cl2
Thanks!
Answer:
Explanation:
1. The reaction will proceed backward, shifting the equilibrium position to the left.
2. The reaction will proceed forward, shifting the equilibrium position to the right.
3. Either add more of the products ( H2O or Cl2) or remove the reactant (HCl or O2)
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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Cheryl kept a potted plant near a window. After two days, she observed that the plant had drooped as shown.
What would most likely help the plant to become healthy
PLEASE HELP!!!!!!!!!!!!!!!!!!! You will recieve 25 points if you help me.
A. watering the plant
B. adding more soil to the pot
C. replanting the plant in a larger pot
D. providing more sunlight to the plant
2. Without energy there can be no
Answer:
Existence
Explanation:
Energy is required for anything to occur, without it there would be no 'causality' for things to change from one moment to the next.
Hope this helped!!!
is part of the digestive and the respiratory system because food and air can travel 3. The through it.
OLungs
O Heart
O Pharynx
O Diaphragm
Help me!!!
Answer:
pharynx
Explanation:
A bacterium called Bacillus thuringiensis contains a protein that can kill cotton ballworms and certain other kinds of caterpillars. A different bacterium called Agrobacterium tumefaciens has the ability to insert its genetic material into plants.
Scientists in the late twentieth century took a gene from Bacillus thuringiensis and inserted it into specimens of Agrobacterium tumefaciens. Genetic material from the Agrobacterium tumefaciens specimens was then inserted into cotton plants. The goal of these tests was to reduce caterpillar infestation in the cotton plants.
These tests are an example of
A.
natural selection.
B.
genetic modification.
C.
creating purebred species.
D.
meiotic cell division.
Answer:
Genetic modification
Explanation:
a desired trait from one organism is placed into that of another organism with human intervention.
For the reaction 2Na + 2H20 - 2NaOH + H2, what type of reaction is taking place?
O synthesis
O decomposition
O single replacement
O double replacement
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
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:
La siguiente ilustración muestra un purificador de agua que utiliza energía solar.
———————————————
Cuál de las siguientes especificaciones es una limitación del sueño del purificador de agua solar?
Answer:
Requiere que el agua pase por membranas de filtración.
Explanation:
Un purificador de agua que utiliza energía solar es un dispositivo innovador y tecnológico que funciona como una estación de saneamiento básico con capacidad para purificar el agua y eliminar el 99% de virus y bacterias.
El sistema funciona de la siguiente manera: cuenta con bomba, panel solar, cargador y mangueras. La bomba mueve el agua a través del filtro utilizando la energía de la batería que se carga con la energía de la luz solar. Incluso en días con poca exposición al sol, el sistema es capaz de utilizar la energía acumulada de la batería y purificar 1 litro de agua en 1 minuto.
Se trata de una tecnología simple e innovadora que puede ser de gran ayuda en el saneamiento básico de lugares que no contienen agua potable, debido a la facilidad y portabilidad del sistema.
What is the relationship between density and speed of light?
Answer:
The more optically dense that a material is, the slower that a wave will move through the material. ... So as the index of refraction value increases, the optical density increases, and the speed of light in that material decreases.
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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