Answer:
B
Explanation:
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
Red lights on a traffic light have a frequency of 4.3 X 1015 Hz. What is the red light’s wavelength in meters?
The wavelength of light is found to be 6.98 × 10^-8 m.
We know that light is an electromagnetic wave, the speed of an electromagnetic wave is commonly referred to as the speed of light which has a numerical value of 3 × 10^8 m/s.
Now;
c = λf
c = speed of light
λ = wavelength of light
f = frequency of light
But;
λ = c/f
λ = 3 × 10^8 m/s/ 4.3 X 10^15 Hz
λ = 6.98 × 10^-8 m
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1. If a metal block with a density of 5.00 g/mL was split into two equal halves, what would the
density be of each individual block? Justify your answer.
Answer:
2.5
Explanation:
Which of these is a property of an alkali metal? An alkali metal is soft. An alkali metal is soft. All of these are properties of an alkali metal. All of these are properties of an alkali metal. An alkali metal is shiny. An alkali metal is shiny. An alkali metal will react with water.
Answer:
All of these are properties of an alkali metal
Explanation:
Alkali metals are metals of group 1. These metals are known to react with water to form the corresponding alkali and liberate hydrogen gas.
They are all silvery in appearance hence they are shiny. They are so soft that they can easily be cut into pieces.
Why do you think experimenters work in labs instead of the natural world?
Answer:
I think experiments work in a lab better than the natural world because you got all the equipment that you need in the lab
I NEED ASAP PLEASE!!
Answer: freezing and evaporation for sure
Explanation:
The mass of the product of a reaction will always equal what
Analyze: What do the elements in each column of the periodic table have in common?
Answer:
Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
Explanation:
Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
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Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes.
What does this represent about the type of change happening in the container?
A chemical change started immediately and finished at eight minutes.
A non-chemical change started immediately and finished at eight minutes.
A chemical change occurred at four minutes.
A non-chemical change occurred at four minutes.
Answer:
i think the answer might be A the frist one
Explanation: because the chemical started immediately when the girl put in the two red colored and it started turning blue and by eight minutes it turned blue completely.
Answer:
A
Explanation:
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
An atom has 17 protons and 18 neutrons.
Which symbol represents that atom, including its mass number?
35S
33Ar
35Cl
34Si
The atmosphere and hydrosphere interact in which type of severe weather?
Answer:
The atmosphere and hydrosphere interact in water-related weather, this includes snowstorms, hurricanes, rainfall, and monsoons.
The question is incomplete, the complete question is;
The atmosphere and hydrosphere interact in which type of severe weather?
A. Hurricanes
B. Drought
C. Sinkholes
D. Wildfires
The atmosphere and hydrosphere interact in the severe weather called hurricanes.
A hurricane is defined as a cyclonic storm which forms over warm tropical waters and moves at about 74 miles per hour.
When hurricanes mostly move over dry water and causes large scale destruction of property. As hurricanes move, they create tornadoes.
Hurricanes are formed when moist air rises over water. A convection current is set up as the moist air is replaced by cooler air.
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What what is the density. Correct units please.
What is the identity of the metal?
Mass of metal: 12.3 g
Initial volume: 20.5 mL
Final volume: 21.9 mL
what is the percentage of hydrogen in 300 g of sucrose?
Answer:
hi
Explanation:
Answer: 6.50%
Explanation:
It is this answer simply because they're the same substance.
Z = 8, number of neutrons = 9 atomic symbol
What is the difference between a chemical formula and a chemical equation?
a chemical formula is the combination of atomic symbol that designer a particle chemical compound aur a substance with two or more different element. A chemical equation show one or more chemical compound( reactance) being convert into different chemicals space is called product
Explanation:
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what special quality does the asthenosphere have that allows the crust to float on it and be moved around ?
Answer:
The tectonic plates do not slowly drift over time because they are floating on a layer of liquid rock. They drift because they are sitting on a layer of solid rock (the upper mantle or "asthenosphere") that is weak and ductile enough that it can flow very slowly under heat convection, somewhat like a liquid.
Explanation:
What is the IUPAC name for CH3-CH2-CH(OH)CH3?
Answer:
2 butanol or sec butanol
What do March 21st and September 21st have in common?
Answer:
The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.
Explanation:
What do scientists hope to learn by collecting information about friction along faults?
Answer:
By measuring friction along faults, scientists can tell where rocks are moving along easily and where they are locked. They hope to use this information to predict where major earthquakes might occur.
Explanation:
Answer:
By measuring friction along faults, scientists can tell where rocks are moving along easily and where they are locked. They hope to use this information to predict where major earthquakes might occur.
Explanation:
tOaTLLY DiDnT cOpY iT
More people in Australia have skin that is easily damaged by sunlight?
define the law conservation of mass
Answer:
Explanation:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so the quantity can neither be added nor be removed.
hope it helps
Classify the following materials rock or mineral
Answer:
Common minerals include quartz, feldspar, mica, amphibole, olivine, and calcite. A rock is an aggregate of one or more minerals, or a body of undifferentiated mineral matter. Common rocks include granite, basalt, limestone, and sandstone.
Quadrilateral ABCD is shown on the coordinate grid below.
Which rule best describes the transformation that was used to create quadrilateral A'B'C'D'?
A. Quadrilateral ABCD was dilated by a scale factor of –1 to create quadrilateral A'B'C'D'.
B. Quadrilateral ABCD was dilated by a scale factor of 2 to create quadrilateral A'B'C'D'.
C. Quadrilateral ABCD was dilated by a scale factor of 0.5 to create quadrilateral A'B'C'D'.
D. Quadrilateral ABCD was dilated by a scale factor of 0.25 to create quadrilateral A'B'C'D'.
Answer:
The answer is B
Explanation:
Explain why a melted ionic compound is a good conductor of electric current by a solid ionic compound is a poor conductor of electric current?
Answer:
Melted ionic compounds have freely moving ions while solid ionic compounds do not.
Explanation:
A melted ionic compound has freely moving ions where electrons can be transfered because the elements of the ionic compounds have broken there bonds and have dissociated into their ions. Compared to a solid ionic compound where it's still in the crystal lattice and the elements will stick in place and the ions will not move because it's in a solid state and they haven't dissocated into their ions.
50.0 g of NaNO3 are dissolved into enough water to make 250 mL of solution. What is the molarity of this solution?
Answer:
2.35 M
Explanation:
Molarity is mol/L of solution. We have to convert the g to mol and the mL to L. G to mol uses the molar mass of the compound. The molar mass of NaNO₃ is 85.00g/mol.
[tex]50.0gNaNO3*\frac{1molNaNO3}{85.00gNaNO3} = 0.588molNaNO3[/tex]
Then you have to convert mL to L.
[tex]250mL*\frac{1L}{1000mL} = 0.250L[/tex]
Now divide the mol by the L.
[tex]\frac{0.588mol NaNO3}{0.250L} = 2.352 M[/tex]
Round to the smallest number of significant figures = 2.35M
Which of the following cannot be determined by an H-R Diagram?
Brightness (Luminosity)
Temperature
Color
Location
Was Democritus' atomic theory correct?
Answer:
Yes, Democritus's atomic theory was correct.
Explanation:
He thought the first part of his theory states that all matter is made of atoms, which are indivisible. The second part of the theory says all atoms of a given element are identical in mass and properties. The other scientists added onto his theory to show that he was correct, except Aristotle, he thought the world was made of the 4 elements: earth, wind, fire, water.
Julie takes a cold glass of clear, colorless liquid out of the refrigerator and puts it on the table. As the liquid warms up to room temperature, Julie sees bubbles of gas form in the liquid and rise to the surface.
Which conclusion is best supported by Julie’s observations?
The liquid is a pure substance because it is colorless.
The liquid is a mixture because its temperature rises.
The liquid is a pure substance because it remains liquid when cold.
The liquid is a mixture because it has a gas dissolved in a liquid.
Answer:
the answer is D. The liquid is a mixture because it has a gas dissolved in a liquid.
Explanation:
i got it right 2020
The liquid is considered as a mixture because this liquid has a gas dissolved which comes out from it in the form of bubbles.
Why this liquid is a mixture?This liquid is considered as a mixture because the gas which is dissolved in it with a high pressure is now removed due to removal of pressure. We know that in mixture elements are mix together not bonded to each other so we can conclude that the liquid is a mixture because it has a gas dissolved in a liquid.
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during energy transformations energy is never
Answer:
created or destroyed
Explanation:
Anything that has mass and takes up space is called *
1 point
matter
energy
heterogeneous
mixture
What holds atoms together in a molecule? *
1 point
gravity
physical bonds
chemical bonds
density
Answer:
the answer is Matter for the first one the second one is a chemical bond
Explanation:
:)
Answer is matter? Hope that helps,
What is the connection between Oobleck and the mantle?
Answer:
Oobleck is a mixture of cornstarch & water, a substance that behaves like the Mantle.
Explanation: