Answer:
Calculator
Explanation:
A calculator is used to make, well calculations
You can use a scale to get information about the weight of an object, and you can observe how weight changes in relation to size etc.
For obvious reasons, you can observe different scents
Again a microscope is an observational tool
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
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
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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:
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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.
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.
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:
What is 2.4 in scientific notation ?
Answer:
2.4 × 10-1
Explanation:
what are saturated hydrocarbons ???
Answer:
they are cyclic aliphatic hydrocarbon and alkanes
Explanation:
the defenition of saturated is that it doesn't react easily or you can say compared to alkenes and alkynes the alkanes doesn't react easily due to lack of pi bonds an only sigma bonds exist
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
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.
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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Approximately how many atoms of hydrogen would be in 1.5 moles of H20?
Answer:
There are two hydrogen atoms per water molecule. There are 6.022x10^23 water molecules per mole.
Explanation:
can you pls tell me advantages and disadvantages of chemistry
(i want them tovhave full sentences)
Answer:
Every object you touch, see, taste, or smell during the day is a chemical, no matter what the signage says on some containers of “Contains no chemicals.” It would seem to me that knowing as much as possible about these objects would be of benefit to mankind, and hence chemistry becomes of great advantage to us all. The science of chemistry really has no disadvantages, but we humans can be at a disadvantage if we do not bother to learn, for example, that cyanide should not be part of your diet.
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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
Suggest why sodium and hydrogen ions do not diffuse at the same rate
Answer:
sodium has got ionic bonds that are weak
compared to hydrogen covalent bonds that are strong
I can lift a 20 kilogram weight over my head ten times before I get tired.
Write this measurement to the correct number of significant figures.
If I lift 20 kilogram weight over my head ten times, then I have lifted 200 kilograms.
According to the question, each of the weight has a mass of 20 kilogram.
I have to lift this weight over my head ten times. Now i want to measure the total weight that i have lifted to the correct number of significant figures.
This now becomes; 20 kilogram * 10 = 200 kilograms.
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Within atoms, what kind of energy
is stored?
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…
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
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 :
[tex] \boxed{ \boxed{ \: \: \: \: \: \: \: 210320000 \: \: \: \: \: \: \: }}[/tex]
Those who answer this I will make as brainliest.
Q. At room temperature, one liter of water can dissolve around 360 grams of salt.How much salt will remain on the bottom of the beaker if 250 grams of salt bedissolved in 580 ml of water as it becomes saturated solution of salt.
Don’t write answer only. Show your working clearly.
Answer: 41.2 grams will remain undissolved
Explanation: The solubility for the salt is 360 g/liter, or 0.36 g/ml. (Based on the word "around" which I take as the limit of solubility).
Thus, if we have 580 ml, (0.36g/ml)*(580ml) = 208.8 grams dissolve.
(250g - 208.8g) = 41.2 grams undissolved.
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.
T'challa's ship has a length of 9 meters. Convert this to centimeters. (There are 100 cm per m)
Group of answer choices
Answer:
900cm
Explanation:
9 multiplied by 100 is 900
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
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).
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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
An Alkali could have a pH of
A.1
B.5
C.7
D.9
7
Scientists use pH to describe how acidic a substance is on a scale of 0 to 14. By definition, a substance is alkaline if it has a pH of over 7.
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What is a cell GJFFVf xfhdfvcdd
Answer:
Yeah
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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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.
