Answer:
Lustrous
Explanation:
Metals are lustrous which gives them a property of having Shiny surfaces
The valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous property of metals.
What are valence electrons?Valence electrons are defined as a negatively charged particle that can be shared or transmitted between atoms that is found in the outermost shell of an atom. Valence electrons have a crucial role in determining how an atom will behave. The electrical configurations of elements can be used to find valence electrons. The total number of valence electrons in that element is then determined by counting the number of electrons in the outermost shell.
When newly treated, polished, or broken, a material takes on a bright look and conducts electricity and heat reasonably well. Metals are typically ductile and malleable. These traits are the result of the metallic bond that connects the atoms or molecules of the metal.
Thus, the valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous property of metals.
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What mass of sugar and water is needed to make 40 g of 10% solution?
Answer
16g
Percent by mass= mass of solute/mass of solution * 100
Explanation: work out the equation
Question 5 (Fill-In-The-Blank Worth 2 points)
(03.05 LC)
The number that represents a neutral pH is _______.
Numerical Answers Expected!
Answer for Blank 1:
Question 6(Multiple Choice Worth 2 points)
(03.05 MC)
Which item is made from an acidic ingredient?
Detergent
Soap
Ammonia
Vinegar
Question 7(Multiple Choice Worth 2 points)
(03.05 MC)
Which substances will make a salt when combined?
Vinegar and tea
Soda and wine
Soda and ammonia
Fertilizer and detergent
Question 8(Multiple Choice Worth 2 points)
(03.05 MC)
Which description is not a property of an acid?
pH lower than 7
Turns litmus paper blue
Sour taste
Corrosive
Question 9(Multiple Choice Worth 2 points)
(03.05 MC)
Complete the sentence. When an acid is added to water, hydrogen ions __________.
increase
decrease
stay the same
disappear
There are 6. 022 Times. 1023 atoms of Hg in 1 mole of Hg. The number of atoms in 4. 5 moles of Hg can be found by multiplying 4. 5 by 6. 022 Times. 1023. Which is the number of atoms in 4. 5 moles of Hg, correctly written in scientific notation with the correct number of significant figures? 2. 7 Times. 1024 27 Times. 1023 2. 71 Times. 1024 27. 099 Times. 1023.
The number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.
The number of atoms in a mole of sample has been given by Avogadro number. Avogadro number has been a constant and has been given the value of [tex]\rm 6.023\;\times\;10^2^3[/tex].
The number of atoms in a mole of sample has been given as:
[tex]\rm 1\;mole=\;6.022\;\times\;10^2^3[/tex]
The given sample has been consisted of 4.5 moles of Hg. Thus, the number of atoms in the sample has been given by:
[tex]\rm 1\;mole\;Hg=\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=4.5\;\times\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=27.099\;\times\;10^2^3\;atoms[/tex]
The scientific notation has been the short hand used for writing the numbers. The short hand for atoms in 4.5 moles of Hg has been [tex]\rm 2.7099\;\times\;10^2^4[/tex].
Thus, the number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.
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what is a tidal barrage
plase explaine
Answer:
A dam like structure used to capture energy from masses of water moving in or out of a bay of rivers due to tidal force is called tidal barrage.
Explanation:
It may help you to solve question.
Which of the following could be classified as producing a physical change?
A. Burning a candle
B. Leaving a bicycle outside to rust
C. Bending sheet metal
D. Toasting a slice of bread
Answer:
C. Bending sheet metal.
Explanation:
The metal is still intact. No change in chemical bonds have occurred.
Burning a candle is converting wax into heat, CO2 and carbon soot.
A rusting bicycle is converting goof iron, Fe, into iron oxide (rust, Fe2O3)
Toasting bread is more difficult to define. If the bread is just warmed, then it is physical. If it is toasted (browned/burned), then a few surface molecules have been converted into tasty carcinogens, my favorite poison.
Calculate the empirical formula for acetaminophen(Tylenol)
The heating system on the second floor is being fixed Dr Kline explained Please bring these extra blankets up there for the patience
two samples of solids have similar reactivity with acids and similar densities. their masses and volumes, however, are not at all similar. is it possible that these are the same substance?
Given that the volume and mass of a substance are not defining properties, it is entirely possible for two samples with different volumes and mass to be the same substance.
What are defining properties of a substance?These are properties that can help us to identify a substance. The most useful of which tend to be chemical properties such as reactiveness or melting points. Colors and density can also offer the insight needed to identify elements and substances. Mass and volume are not properties of a substance given that they can change often depending on the sample size and thus do not help to identify a substance.Therefore, since the volume and mass of a substance are not defining properties of a substance, we can confirm that it is entirely possible for two samples with different volumes and mass to be the same substance.
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A compound has a molar mass of 163.59 g/mol. If you have 736.155 grams of this compound, how many moles do you have?
Answer:
4.50000 moles
Explanation:
This is dimensional analysis. If there is 163.59 grams in 1 mole of this compound then the converse is true: in 1 mole of this compound there is 163.59 grams --> 1 mol/163.59 grams.
Now that you have your conversion factor:
736.155 grams * (1 mol/163.59 grams) is your equation.
When you multiply these together, grams cancel and you end up with the desired mole-based answer:
4.50000 moles (The extra zeros are to make up for the 6 significant figures in 736.155, feel free to omit them if necessary.)
(pls give brainliest if this helped)
give free 18 points again just answer yes or no
is einstein a scientist? yes or no
Answer:
yes
Explanation:
Answer:
Yes
Explanation:
Albert Einstein is often cited as one of the most influential scientists of the 20th century. His work continues to help astronomers study everything from gravitational waves to Mercury's orbit
Answer the following;
Pls helppp
Answer:
The answer is A
Explanation:
Answer:
D)All of the above
When magnesium ium is left in moist air for several hours, the metal Sur face taanishes?why
Answer:
due to the formation of an oxide or hydroxide layer
Explanation:
magnesium is a reactive metal...when left in air it reacts with oxygen to form an oxide layer of MgO and it can react with moisture to form Mg(OH)2 LAYER ON THE SURFACE.
HURRY I HAVE 20 MIN LEFT will mark brainllest When. Coach Kwan notices that a player is getting tired, she takes out the tired player and substitutes a fresh player. Which type of chemical reaction does this best model?
replacement
decomposition
synthesis
oxidation
A Herbig-Haro (HH) object is:_:_________.
a. a small galaxy just outside the outer edge of the Milky Way
b. where a jet from a star in the process of being born collides with (and lights up) a nearby cloud of interstellar matter
c. a part of a giant molecular cloud where molecules containing two hydrogen atoms form
d. a star that has too little mass to start fusion in its core
e. cluster of very low-mass stars, observable only with infrared radiation
Given what we know about Herbig-Haro (HH) objects, we can confirm that they are born from the collision between a jet from a star and clouds of interstellar matter.
What are Herbig-Haro (HH) objects?To put it simply, a Herbig-Haro (HH) object is what we observe as a bright spot in distant space. Upon closer observation we can observe that these giant bright patches are not lone objects, but in fact immense groups of interstellar matter. How Herbig-Haro (HH) objects are formed.The formation of one of these interstellar groups requires an immense amount of energy. This energy come from the speed at which the materials that form these objects collide.As stated in the question, the jet released from a star in the process of being born smashes into a giant cloud of dust and interstellar material to form the Herbig-Haro (HH) objects. This collision happens at hundreds of km/s. To put it into perspective, it would be roughly 500,000 miles per hour.Therefore, we can confirm that option b, which states, "where a jet from a star in the process of being born collides with (and lights up) a nearby cloud of interstellar matter", is the correct choice for the question pertaining to Herbig-Haro (HH) objects.
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what are Metals that are less reactive than alkali metals and alkaline-earth metals called
Answer:
The first ionization energies (I1) of the alkaline earth metals are not as low as the alkali metals. The alkaline earth metals are therefore less reactive than the alkali metals (Be and Mg are the least reactive of the alkaline earth metals). Several physical properties of these elements are compared in Table 7.7.
If 65.8 grams of SO3 are produced in the unbalanced reaction below, how many grams of oxygen reacted? SO2(g) + O2(g) —> SO3(g) Show work please.
Answer:
13.13g
Explanation:
65.8÷80.06 =0.821 mol the same
the same amount of moles of Oxygen reacts with
because the ratio is 1 :1-1
let's calculate how much grams for 0.821 of oxygen
oxygen 1 mole is =16 g
well for 0.821=16* 0.821 which is 13.136grams
Which of the following statements describes sound energy?
Sound energy does not travel at all.
Sound energy needs a medium to travel through.
Sound energy can travel in empty space.
Sound energy can only travel through air.
Answer:
C.
Explanation:
an atom of chlorine has an amount number of 17 and a mass number of 37. how many protons neutrons, and electrons are in the atom?
Answer: There are 20 protons neutrons in the atom
What is the minimum uncertainty in a simultaneous measurement of the y-component of the proton's velocity?.
Answer: c
Explanation:
the bradford assay only works at low protein concentrations
Answer:
Dilute the sample
Explanation:
The statement is not entirely accurate. The Bradford assay is commonly used to determine protein concentrations in a sample.
However, it is true that the Bradford assay is more accurate and reliable for measuring protein concentrations at low to moderate levels rather than at very high concentrations.
The Bradford assay is based on the binding of Coomassie Brilliant Blue dye to proteins. The dye undergoes a color change from brown to blue when bound to proteins, allowing for the measurement of protein concentrations. At low protein concentrations, the binding of the dye to proteins is well-calibrated and results in a linear relationship between protein concentration and color intensity, making it suitable for accurate quantification.
At high protein concentrations, the binding capacity of the dye may become saturated, leading to non-linear and less accurate measurements. The excess protein can also cause interference and affect color development. In such cases, dilution or alternative protein quantification methods may be more suitable, such as the BCA assay or the Lowry assay.
Therefore, while the Bradford assay can be used to measure protein concentrations across a range of concentrations, it is generally more reliable for low to moderate protein concentrations.
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For the balanced equation shown below, how many grams of CO2 will be
produced from 74.23 grams of CO? CO + Fe3O4 → 3FeO + CO2
Answer:
116.64 g
Explanation:
74.23÷14 This is # of moles .
# of moles for co = 5.302
Then mass of co2 = 116.64
What is the frequency of 14000 X ray photons having an energy of 5.27*10-5 J/Hz
The frequency of the X - ray is [tex]7.95 \times 10^{28} \ Hz[/tex].
The given parameters:
Energy of the X-ray, E = 5.27 x 10⁻⁵ JThe frequency of the wave is calculated as follows;
[tex]E = hf\\\\f = \frac{E}{h} \\\\[/tex]
where;
h is Planck's constant = 6.626 x 10⁻³⁴ J/HzSubstitute the given parameters;
[tex]f = \frac{E}{h} \\\\f = \frac{5.27 \times 10^{-5} }{6.626 \times 10^{-34}} \\\\f = 7.95 \times 10^{28} \ Hz[/tex]
Thus, the frequency of the X - ray is [tex]7.95 \times 10^{28} \ Hz[/tex].
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Calculate the mass of nitric acid required to make a 250mL solution with 2.40 ph
Please show steps, I am trying to learn!
The mass of nitric acid required to make the given solution is 0.0627 g.
The given parameters:
Volume of the acid, V = 250 mLpH of the acid, = 2.4The hydrogen ion (H⁺) concentration of the nitric acid is calculated as follows;
[tex]H^+ = 10^{-pH}\\\\H^+ = 10^{-2.4}\\\\H^+ = 0.00398[/tex]
The molarity of the nitric acid is calculated as follows;
[tex]= 0.00398 \ H^+ \times \frac{1 \ M \ HNO_3}{1 \ H^+} \\\\= 0.00398 \ M[/tex]
The number of moles of the nitric acid is calculated as follows;
[tex]moles = M\times L\\\\moles = 0.00398\ M \ \times \ \frac{250 \ mL}{1000} \\\\moles = 9.95 \times 10^{-4} \ mol.[/tex]
The molar mass of nitric acid is calculated as;
[tex]HNO_3 = (1) \ + (14) \ + (16 \times 3) = 63 \ g/mol[/tex]
The mass of the nitric acid contained in the calculated number of moles is calculated as;
[tex]mass = moles\ \times \ molar \ mass\\\\mass = 9.95\times 10^{-4} \ mol. \ \times \ 63 \ g/mol\\\\mass = 0.0627 \ g[/tex]
Thus, the mass of nitric acid required to make the given solution is 0.0627 g.
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The amount of energy needed to change a liquid to a solid is calculated using the enthalpy of ________ and has a __________ sign on the energy value.
Which of the following statement is correct regarding motors and generator?
Answer:
A. Motors and generators are opposite processes
Explanation:
B, C, and D are wrong because, the term electrical generator is used to describe a range of devices that convert mechanical energy into electricity. A motor converts electrical energy into mechanical, which is the opposite process to the electrical generator.
which two body systems are primarily responsible for locomotion
Locomotion and movement are brought about by skeletal and muscular system of the body. It’s a coordinated event of the skeletal and muscular system brought by contraction and relaxation of muscles.
How does locomotion occur in our body?
Locomotion occurs with help of specialised muscles, muscular and non-muscular by nature.
It involves the interaction of muscles (tendons and ligaments) and skeletal joints and cartilage
Locomotion is a voluntary action which require involvement of the nervous system.
In muscles actin and myosin protein forms cross bridges, consuming ATP.
Hence, to bring about locomotion skeletal and are responsible.
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How does dissolving skittles apply to the real world?
Answer:
Skittles are coated with sugar and food coloring. When you add warm water to the Skittles, the sugar and food coloring start to dissolve. They have similar amounts coated on them so they dissolve at similar speeds and stay in their lanes.
The sugar is moving to areas of water with lower sugar concentration. If the water is poured in the center, this is happening for each Skittle at relatively the same speed.
Explanation:
what type of elements form ionic bonds with metals
Answer:
between metal and nonmetal ions
Explanation:
what’s chemical formula ammonium iodide?
Answer:
NH4I
..................
I hope it helps
Answer:Ammonium Iodide is a chemical compound with a formula Explanation: nh4l
(BRAINLIEST QUESTION)
Which answer below best describes what the law of Natural Selection is?
Select one:
a.
Natural selection is the process where those members of a species that can survive environmental hardships reproduce the future offspring with their strong characteristics being passed on, thus evolving the entire species.
b.
Natural selection is the process wherein species evolve over time because those members with common traits tend to survive hardships and produce more offspring.
c.
Natural Selection is the law that states the the natural evolution of a species is dependent on the shifts of the environment.
Answer:
I think it's A but I might be wrong
Explanation: