Answer:
Coloroplasts I hope it's right ❤️
A scientific theory _______.
a.
describes what occurs every time in a given situation
b.
is not validated by experimentation
c.
can never be changed
d.
is an explanation for a set of events
Please select the best answer from the choices provided
Answer:
D! I had this question for a test last year :)
Answer:
b
Explanation:
it is experimental and can be changed
What would happen if you poured gasoline into water? *
the gasoline would float on top of the water
the water would float on top of the gasoline
the gasoline would be suspended in the middle of the water
the water would be suspended in the middle of the gasoline
A chemist investigates the
I) melting point
II) flammability
III) boiling point
of acetone, a component of fingernail polish
remover. Which is/are physical?
1. II only
2. I and II only
3. II and III only
4. III only
5. I. II and III
6. I and III only
7. I only
8. None of these
Answer:
1, 2 & 3
Explanation:
. A chemist investigates the boiling point, melting point, and flammability
of a compound called acetone, a component of nail polish remover.
Which of these properties are physical properties and which are
chemical properties?
Physical ( boiling point and melting point ).
Chemical ( flammability )
Among the properties listed (melting point, flammability, and boiling point), only the flammability of acetone is a chemical property. The other properties (melting point and boiling point) are physical properties since they are associated with changes in state .
The correct option is 1 .
The melting point of a substance is the temperature at which it changes from a solid to a liquid state. This is a physical property because it does not involve a change in the chemical composition of the substance. However, acetone is a liquid at room temperature, and therefore, it does not have a well-defined melting point. It would vaporize (evaporate) instead of melting.
Flammability is a chemical property. It refers to the ability of a substance to undergo combustion when exposed to a flame or ignition source. It involves a chemical reaction, as the substance interacts with oxygen to produce heat and light.
The boiling point of a substance is the temperature at which it changes from a liquid to a gas state. This is a physical property, similar to the melting point, as it does not involve a change in the chemical composition of the substance.
Hence , 1 is the correct option
To learn more about melting point
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Please help it’s worth a lot!! I need the answer ASAP!!
Answer:
Show me the previous question so I can help
What are natural shelters?
Answer:
Natural Shelters Do not overlook natural formations that provide shelter. Examples are caves, rocky crevices, clumps of bushes, small depressions, large rocks on leeward sides of hills, large trees with low-hanging limbs and fallen trees with thick branches.
Answer:
the shelter made from nature for wild animals
Mark the following statements as true or false. The bonds between water molecules are stable. (Click to select) As temperature drops the bonds between water molecules are less likely to break. (Click to select) Ice is denser than liquid water at all temperatures. (Click to select) The polar covalent bonds between hydrogen and oxygen atoms within a water molecule create slight positively and negatively charged ends to the molecule. (Click to select) The fluid nature of water is due to hydrogen bonds continually breaking and reforming. (Click to select) A hydrogen atom of one water molecule binds via a hydrogen bond to a hydrogen atom of another water molecule. (Click to select) Bonds between water molecules are stronger than the bonds between the atoms within a water molecule. (Click to select)
The following statements are classified as true or false
The bonds between water molecules are stable....... False
As temperature drops the bonds between water molecules are less likely to break........ True
Ice is denser than liquid water at all temperatures..... False
The polar covalent bonds between hydrogen and oxygen atoms within a water molecule create slight positively and negatively charged ends to the molecule......True
The fluid nature of water is due to hydrogen bonds continually breaking and reforming.... True
A hydrogen atom of one water molecule binds via a hydrogen bond to a hydrogen atom of another water molecule....False
Bonds between water molecules are stronger than the bonds between the atoms within a water molecule.....False
Water is a polar substance. Polar substances have a positive end and a negative end. The positive end of water is the hydrogen atom while the negative end is the hydrogen atom.
Hydrogen bonds are formed when the hydrogen atom of one water molecular is connected to the oxygen atom of another water molecule via dipole-dipole interaction.
Hydrogen bonds are weaker than the normal covalent bonds that exist between hydrogen and oxygen atoms in water molecule.
The maximum density of water is obtained at 4°C. Below this temperature, the density water expands hence the density of ice is less than the density of water.
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van dar waals are the dominant molecular force in the sodium chloride.
Answer:
Recall the two conceptual steps necessary to dissolve a solute and form a solution
Key Points
There are two conceptual steps to form a solution, each corresponding to one of the two opposing forces that dictate solubility.
The first conceptual step is dissolution, which corresponds to the force of the solvent-solvent and solute-solute intermolecular attractions that needs to be broken down.
The second conceptual step is solvation, which corresponds to the force of the solute-solvent intermolecular attraction that needs to be formed in order to form a solution.
Many intermolecular forces can contribute to solvation, including hydrogen bonding, dipole-dipole forces, Van Der Waals forces, and ion-dipole interactions.
Term
intermolecular forcesattractive and repulsive forces between molecules
The strength of the intermolecular forces between solutes and solvents determines the solubility of a given solute in a given solvent. In order to form a solution, the solute must be surrounded, or solvated, by the solvent. Solutes successfully dissolve into solvents when solute-solvent bonds are stronger than either solute-solute bonds or solvent-solvent bonds.
Qualitatively, one can determine the solubility of a solute in a solvent by using the rule “like dissolves like”. In general, solutes whose polarity matches that of the solvent will generally be soluble. For example, table salt (NaCl) dissolves easily into water (H2O) because both molecules are polar.
Intermolecular Forces and Their Importance in Solution Formation
There are two conceptual steps to form a solution, each corresponding to one of the two opposing forces that dictate solubility. If the solute is a solid or liquid, it must first be dispersed — that is, its molecular units must be pulled apart. This requires energy, and so this step always works against solution formation (always endothermic, or requires that energy be put into the system).
#pa follow and heart po para sa iba pang answer at pa brainlest answer na den
2. Name 3 elements that are found in the same period.
3. Identify each of the following
a. Metal:
I
b. Nonmetal:
c. Metalloid:
d. Alkali Metal:
e Halogen:
f Noble Gas:
I need help with this one
Answer:
H, B, G, D, E, C, A, F
explanation: the ones that are the deepest are the oldest
What is 2.4 in scientific notation ?
Answer:
2.4 × 10-1
Explanation:
Which of the following volumes are equal to one liter? Select all that apply.
Check all that apply
10° nl.
1 dm
10 ml
1000 cm
100 dL
The volumes that are equal to one liter are 1 dm and 1000 cm and can be seen in Option B and D respectively. The information below shows the calculation to arrive at the answer.
Dimensional analysis can be defined as the method of conversion from one given unit to another. It is often required to deal with measures that are extremely small (e.g size of an atom) or extremely big, In such circumstances, a conversion between metric measuring units is typically essential.
We are to determine which volumes in the given option are equal to 1 Liter.
Following the International System of Units (SI);
a.
10° nl = 10 nanoliters
10 nanoliters = 1 × 10⁻⁸ Liters
∴
It is incorrect
b.
1 dm = 1 cubic decimeter
1 cubic decimeter is equivalent to 1 Liter.
∴
Option B is correct
c.
10 ml = 10 milliliters
10 milliliters = 0.01 Liter
∴
Option C is incorrect
d.
1000 cm = 1000 centimeters
1 cm = 0.001 Liter
∴
1000 cm = 1 × 0.001 Liters
1000 cm = 1 Liters
Option D is correct
e.
100 dL = 100 deciliters
1 deciliter = 0.1 Liters
∴
100 deciliters = 10 Liters
As such, this option is also incorrect.
Therefore, we can conclude that Only Option B and D are the volumes that are equal to one Liter.
Learn more about Unit conversion here:
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A homogeneous mixture is a composition of two or more
impure substances in a definite proportion, displaying non-
uniform characteristics.
TRUE
FALSE
The answer is FALSE. I did it on ck-12
What is a cell GJFFVf xfhdfvcdd
Answer:
Yeah
Explanation:
The volume (V) of an enclosed mass of gas is 350kPa. The pressure of the endlosed gas is now decreased to 125kPa, at constant temperature. What will the new volume of the gas be, in terms of V (2)
Answer: V1/V2 = 0.357,
V2 = (V1/0.357) or 28.0*V2
Explanation: Use the combined gas law: P1V1/T1 = P2V2/T2 We want to find V1/2 (or V2/V1). Rearrange:
V1/V2 = (P2/P1)(T1/T2)
The units all cancel. Temerature is constant, so (T1/T2) = 1.
V1/V2 = (125/350)*(1)
V1/V2 = 0.357
Slove this fill in blanks
Answer:
1) Heterogeneous mixture
2). homogeneous mixture
3) water is solvent and sugar is solute
4). sublimation process
heterogeneous
homogeneous
sugar is solvent and water is solute
???
Differentiate endothermic and exothermic reaction
Answer:
A popular example of an endothermic chemical reaction is photosynthesis.
...
Exothermic Reactions.
Endothermic Reaction Exothermic Reaction
The energy is absorbed from the surrounding into the reaction The energy is released from the system to its environment.
Energy in the form of heat Energy is released as heat, electricity, light or sound.
Explanation:
Exothermic reactions transfer energy to the surroundings. ... The reaction that does the complete opposite (it absorbs heat) is an endothermic reaction. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter.
in dsubshell of an atom the maximum number of electrons that can be adjusted is
Answer:
10 electrons
The d subshell can hold a maximum of 10 electrons.
Explanation:
Amplify 1.5 force and motion answers??
Answer:
explain question please
Explanation:
Electricity is the flow of...
A. Neutrons
B. Electrons
C. Protons
D. Positrons
Answer:
B. Electrons.
....Hope it helps you....Answer:
B. Electrons
Explanation:
Electrons are held in their shells by an electrical force, so it has to be Electrons.
hope i helped
Page : Date: What do you mean by a symbol ? What are the bases of making symbols?
Answer:
Hi, There! your Answers are Below And Are 100% Correct
Symbols are the basis of culture. A symbol is an object, word, or action that stands for something else with no natural relationship that is culturally defined
Explanation: The Answer to your Other Question Is In the Pic :)
(Dont forget to mark thanks)
Extend your thinking: Why do you think the temperature does not change much during a phase change?
UGHHHH!! THIS IS STRESSING ME OUT! PLS HELP MEEEE!!
Answer:
Look in explanation:
Explanation:
The definition of temperature is the measure of kinetic energy(which is the energy used to measure motion). Since phase changing is only changing the energy, the kinetic energy will not change. There is only energy used to separate the molecules. You can see on a phase change graph that the temperature stays constant during a phase change and will ONLY change after the change has already been done.
a density of 22.29 g/cm?
What is the mass of a block that measures 6.7 cm by 6.8 cm by 4.3 cm and has a density of 22.29 g/cm^3
Answer:
Jjjiiiiiiiikiioioiiiii99ooi
Which of the following correctly describes what happens to the kinetic energy of water when it changes from steam to a
liquid?
There is no change in the kinetic energy of the molecules.
The kinetic energy of the molecules increases.
The kinetic energy of the molecules decreases.
The kinetic energy of the molecules increases then decreases.
hi <3
i would say the kinetic energy decreases (so option C), as liquid particles are more closely packed than in a gas
hope this helps <3
Teeth are part of the digestive system.
True or False
please help :(
Answer:
True
Explanation:
It all starts out going through your mouth in which you have to chew the food to swallow it.
What does it mean when it asks for the planet’s composition?
Answer:
bussy
-/////////////-
Explanation:
Answer: its asking for what gases make up that planet
Explanation:
for example: jupiter is made up of 90% hydrogen ~10% helium and <1% hydrogen.
What information is needed to determine the velocity of an elevator?
Answer:
Velocity is vector quantity. So it needs direction in addoition to speed.
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of its speed and direction of motion.
PLS HELP ME
The moon is 2.39 • 10^5 miles from the earth. The
average man is 6 feet tall. How many men would have
to stand on top of one another to reach from the earth
to the moon? (there are 5,280 feet in a mile. How many
miles is 6 feet?)
Number of men required to stand on top of each other to reach moon from earth are :
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Well I need help in number 11, the equation is D=V0T
Answer:
d = 44 km (you have the answer?)
Explanation:
time = 35 minutes * 1 hour / 60 minutes
time = 0.58333 hours.
D = r * t
r = 75 km / hr
t = 0.58333 hours
d = 75 * 0.58333
d = 43.74 km
What is the gravitational potential energy of a 30kg wrecking ball hanging from a crane 100m high ?
Answer:
Gravitational potential energy is one type of potential energy and is equal to the product of the object's mass (m), the acceleration caused by gravity (g), and the object's height (h) as distance from the surface of the ground (the body). In this example, a 3 kilogram mass, at a height of 5 meters, while acted on by Earth's gravity would have 147.15 Joules of potential energy, PE = 3kg * 9.81 m/s 2 * 5m = 147.15 J. The energy added to the system by the crane's swing is the gravitational potential energy gained by the change in the wrecking ball's height. We'll need to use trigonometry to determine the height based on the cable length and angle, calculate the potential energy gained, and convert it to kinetic energy.
is energy absorbed or released to separate the atoms in water molecules
Answer:
First of all, Energy is released when water molecules bond.
Explanation:
When a bond is formed its stability increases from their respective atoms. So energy is released but when we are breaking a bond we are changing a compound to a lower energy state to higher energy state it's stability decreases and requires a bit of extra energy higher stability of bond higher energy required to break it…
