Answer:
0.000305 km
Explanation:
1 foot = 0.000305 kilometers
Answer:
[\tex]\huge\bold\red{brainiest answer}[/tex]1 km =3,280.8398950131foot
how many protons electrons and nuetrons does as have
elasric energy is a type of kenetic energy true or false
Answer:
False
Explanation:
Complete the passage. K (potassium) belongs to group IA of the periodic table, and has 1 valence electron. Br (bromine) belongs to VIIA, and has valence electrons. answer= 7
Answer:
See detailed explanation.
Explanation:
Hello.
In this case, since the electron configuration of potassium whose atomic number is 19 turns out:
[tex]K^{19}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^1[/tex]
We can see that the last level is 4 which has one electron, meaning that potassium has one valence electron. Moreover, since bromine's atomic number is 35, its electron configuration is:
[tex]Br^{35}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^5[/tex]
We can see that the last level is also 4 and it has 2+5 = 7 valence electrons. In such a way, we infer that the valence electrons are computed by the electrons at the outer or last energy level of an element.
Regards.
Answer:
7
Explanation:
A chemist needs to create a series of standard Cu2+(aq) solutions for an absorbance experiment. For the first standard, he uses a pipet to transfer 10.00 mL of a 2.61 M Cu2+(aq) stock solution to a 250.0 mL volumetric flask, and he adds enough water to dilute to the mark. He then uses a second pipet to transfer 10.00 mL of the second solution to a 100.0 mL volumetric flask, and he adds enough water to dilute to the mark. Calculate the concentration of the Cu2+(aq) solution in the 100.0 mL volumetric flask. concentration: M
Answer:
0.01 M
Explanation:
The chemist is performing a serial dilution in order tyo obtain the calibration curve for the instrument.
First we must obtain the concentration of the solution in the 250ml flask from
C1V1 = C2V2
Where;
C1 = concentration of the stock solution
V1 = volume of the stock solution
C2 = concentration of the diluted solution
V2= volume of the diluted solution
2.61 × 10 = C2 × 250
C2 = 2.61 × 10/250
C2 = 0.1 M
Hence for solution in 100ml flask;
0.1 × 10 = C2 × 100
C2 = 0.1 × 10/100
C2 = 0.01 M
The purpose of a thermostat on a hot water boiler is:
pouring cold water in your hot coffee is
conduction
convection
radiation
Pouring cold water into your hot coffee is convection. Therefore, option B is correct.
What is convection?Convection can be explained as the transfer of heat from one place to another because of the movement of fluid. Convective heat transfer can be defined as the combined processes of conduction and advection.
Gases as well as liquids are not good conductors of heat under normal pressure and temperature conditions, but they can easily transfer heat from one region to another region.
Convection takes place through diffusion but does not take place in solids substances, as there is no movement of constituent particles takes place. The diffusion of heat energy that occurs in solids is called thermal conduction.
Heat energy transfer that takes place between a surface and a liquid when they come in contact with the surface is called convection heat transfer. Therefore, heat transfer takes place through convection when pouring cold water into hot coffee.
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2. What is the formula to calculate speed?
Answer:
s=d/t
s=speed
d=distance traveled
t=time elapsed
If an element has atoms, in their ground-state, with 6 valence electrons, the element could be: (check all possible answers)
Answer:
You included no options however the elements with 6 Valence electrons are;
Oxygen ⇒ OSulfur ⇒ SSelenium ⇒ SeTellurium ⇒ TePolonium ⇒ Polivermorium ⇒ UuhValence electrons refer to the electrons an element has on its outermost shell. The number of these electrons determines the charge that an electron will carry as it seeks stability.
It also determines which group the element will be in in the Periodic table. Elements with 1 valence electron for instance will be in Group 1 and elements in Group 16 will have 6 valence electrons.
How to convert 118lbs to kg step by step
Answer:
53.524 Kilograms ( kg )Explanation:
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A chemical reaction produces 56.2 grams of iron (II) sulfide (FeS). How many moles of iron (II) sulfide does the reaction produce? (1 mole FeS = 87.92 grams FeS) *
1.00 moles FeS
2.50 moles FeS
0.639 moles FeS
4.98 moles FeS
Answer:
0.639
Explanation:
Question 10
Which of the following is a the correct formula for 2 atoms SHARING electrons?
A. F2
B. NaCl
C.KBr
D. CaCl2
Answer:
b
Explanation:
jus bc
Fluorine F₂ is the correct formula for two atoms in sharing of electrons as they have covalent bond among them. Therefore, option (A) is correct.
What is a covalent bond?A covalent bond is created through sharing of electrons between different or the same kinds is known as a covalent Bond.
A covalent bond has equal sharing of electrons among bonded atoms. The pair of electrons which is shared between atoms is known as shared pair.
Sharing of electrons will help atoms to attain stability in their valence shell as noble gases. Atoms share their electrons with the other atoms in a way so that both atoms can gain octet configuration in their valence shell.
The bond between two fluorine atoms is a covalent bond formed by sharing of electrons. The Bond between sodium and chlorine in NaCl, KBr, and CaCl₂ is an ionic bond formed by the complete transfer of electrons.
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How are gases and liquids different from each other? O A. Liquids can change volume, and gases cannot. B. Gases can change shape, and liquids cannot. C. Liquids can change shape, and gases cannot. D. Gases can change volume, and liquids cannot.
Answer:
d
Explanation:
d is the right answer since gases do not have definite shape and volume and liquids have definite volume. so liquid cannot change its volume but gas can
The total energy in an isolated system is conserved.
True or false?
Answer:
true
Explanation:
Write a balanced chemical equation for the standard formation reaction of gaseous hydrogen iodide
A balanced chemical equation for the standard formation reaction of gaseous hydrogen iodide is H₂(g) + I₂(g) → 2HI(g).
What is balanced reaction?Balanced chemical reactions are those in which equal amount of each entities will present on both sides of the reaction.
Formation of gaseous hydrogen iodide takes place by the mixing od hydrogen gas and iodine gas and balanced chemical equation for the formation of HI will be represented as:
H₂(g) + I₂(g) → 2HI(g)
So, required equation is H₂(g) + I₂(g) → 2HI(g).
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If you weigh 118 lbs, how many kilograms is this
Answer:
the answer is 53.524 kg
2.0 moles of sodium (Na) would have a mass of-
A) 0.087 grams
B) 46 grams
C) 1.2 x 10^24 grams
D) 3.3 x 10^-24
The rate of reaction in terms of the "rate law expression" includes the rate constant (kk), the concentration of the reactants, and the orders of the reaction with respect to the different reactants. Consider the following reaction: A+B→C+DA+B→C+D The initial concentrations of the reactants AA and BB are 0.200 MM and 0.350 MM, respectively. The rate of reaction is 0.060 M⋅s−1M⋅s−1, and the orders of the reaction, with respect to reactants AA and BB, are 1 and 2, respectively. Determine the rate constant (kk) for the reaction using the rate law. Express your answer in M−2⋅s−1M−2⋅s−1 to three significant figures.
Answer:
[tex]k=2.45M^{-2}s^{-1}[/tex]
Explanation:
Hello.
In this case, considering the given specific orders of reaction, we can write the rate law as:
[tex]r=k[A][B]^2[/tex]
Thus, considering the concentrations of A and B to be 0.200 M and 0.350 M respectively and a rate of 0.060 M/s, the rate constant turns out:
[tex]k=\frac{r}{[A][B]^2}\\ \\k=\frac{0.060M/s}{(0.200M)(0.350M)^2} \\\\k=2.45M^{-2}s^{-1}[/tex]
This is what we know as a third-order reaction since the specific orders both add to 3.
Best regards.
What is the speed of each vehicle? (Remember S=d/t)
A: 50 km/h, B: 40 km/h
A:5 km/h, B: 2 km/h
A: 10 km/h, B: 5 km/h
A: 20 km/h, B: 10 km/h
Answer : The correct option is A: 20 km/h, B: 10 km/h
Explanation :
Speed : It is defined as the distance traveled per unit time.
Formula used:
[tex]S=\frac{d}{t}[/tex]
where,
S = speed
d = distance
t = time
First we have to calculate the speed of vehicle A.
Given:
Distance of vehicle A = 50 km
Time of vehicle A = 2.5 hr
Now putting all the given values in the above formula, we get:
[tex]S=\frac{50km}{2.5hr}=20km/hr[/tex]
Now we have to calculate the speed of vehicle B.
Given:
Distance of vehicle B = 50 km
Time of vehicle B = 5 hr
Now putting all the given values in the above formula, we get:
[tex]S=\frac{50km}{5hr}=10km/hr[/tex]
Therefore, the speed of vehicle A and B is 20 km/hr and 10 km/hr respectively.
By which method is heat transferred in a microwave oven?
Conduction
Convection
Evaporation
Radiation
Answer:
the answer is radiation.
because the microwave is a form of radiation.
give me brainlyest if this was helpful to you otherwise dont.
Answer: D
Explanation:
What is inside a Atom?
Answer:
there are three different subatomic particles inside them: the protons, neutrons, and electrons
Beta-carotene and lutein are carotenoids. What is the primary color that they absorb (and therefore not reflect)
Answer:
Carotenoids absorb light in the blue-green and violet region
Explanation:
Carotenoids are organic pigments of yellow, orange, and red colour that are produced by plants and algae, bacteria, and fungi. Such organic pigments give the characteristic colour to pumpkins, corn, tomatoes, shrimp, and lobster. Carotenoids are also called as tetraterpenoids.
Beta-carotene and lutein are carotenoids. Carotenoids absorb light in the blue-green and violet region.
When naming CoOH, which Roman numeral should be used?Immersive Reader
(A) I
(B) II
(C) III
(D) IV
PLZ HELP I'LL MARK BRAINLIEST
Answer:
coochie man? lol it's probably D or B :D
The elwments in group 17 of the periodic table are all halogens. All halogens have the same ______.
A. Atomic number
B. Atomic mass
C. Number of possible isotopes
D. number of valence electrons
Group 17 elements called halogens . All halogens have the same number of valence
electrons
What tool do scientists use to classify animals?
Scientists use a two-name system called a Binomial Naming System. Scientists name animals and plants using the system that describes the genus and species of the organism. The first word is the genus and the second is the species.
which of the substances created a chemical change
Answer:
It is one and two
Explanation:
When you burn something it lights up
the following chemical equation is not balanced; which element is not following following the law of mass conservation?
C02+CL2 = O2+CCL4
Answer:
C02+2CL2 = O2+CCL4
Explanation:
the co2 gave its carbon atom to the CL2 + CCL4
A student loaded a mixture of compounds onto a silica gel column using 5 mL of dichloromethane as the loading solvent. After running the column using petroleum ether as the eluant and collecting 8 fractions, the student analyzed the contents by TLC to find that all of the compounds in the mixture came off in the first two fractions. In addition, no separation was observed. Choose the statement that BEST describes the error. The sample should be loaded using a maximum 1 mL of CH2Cl2. Petroleum ether was the incorrect eluant. A more polar solvent should have been used. The student should re-run the TLC. It was obviously performed incorrectly. The student packed the column incorrectly.
Answer:
Petroleum ether was the incorrect eluant.
Explanation:
In column chromatography, there must be a mobile phase (eluant) and a stationary phase(adsorbent column). The mobile phase in this case is petroleum ether while the stationary phase is silica gel.
If no separation is observed, then it simply means that the wrong choice of mobile phase(eluant) was made. If a better choice of eluant is made, it can effectively achieve the separation of the mixture. The components of the mixture have a great affinity towards the petroleum ether hence they moved rapidly through the column and separation was not achieved.
Which of the following statements is/are correct? i. Principal energy levels are identified by the letters s, p, d, and f. ii. Principal energy levels appear in both the quantum mechanical model of the atom and the Bohr model of the atom. iii. In general, n = 1 is at lower energy than n = 2, and n = 2 is lower than n = 3, and so on. iv. The principal energy level is related to electron spin. a. i only b. iv only c. i and ii d. ii and iii e. iii and iv
Answer:
d. ii and iii
Explanation:
Both the Bohr model and the wave (quantum) mechanical models of the atom recognize the principal quantum number n. The principal quantum number shows the shell or energy level where an electron may be found.
The energy levels are arranged in increasing order of magnitude. That is n=1 >n=2=n=3 etc
g The difference between an ionic bond and a covalent bond is that Select one: a. ionic bonds commonly occur between two metals and covalent bonds occur between metals and nonmetals. be. ionic bonds are between atoms that can share electrons; covalent bonds are between atoms that will donate/accept electrons. c. covalent bonds come about because of a sharing of electrons; ionic bonds do not. d. ionic bonds are between smaller atoms; covalent bonds are between large atoms.
Answer:
C) Covalent bonds come about because of a sharing of electrons; ionic bonds do not.
Explanation:
There are two main types of chemical bonds- covalent and ionic/electrovalent bonds.
Ionic bond: Ionic or electrovalent bonds are characterized by the transfer of electrons from electropositive atoms (metals) to electronegative atoms (non-metals). The metal atoms after donating their electrons become positively charged ions (cations) while the non-metal atoms after accepting electrons become negatively charged ions (anions). Strong electrostatic forces of attraction constitutes ionic bonds.
Covalent bond: Covalent bonds are formed by the sharing of electrons by the atoms involved in the bond; usually between atoms of comparable electronegativities or atoms of the same element. The shared electrons are contributed by each of the atoms involved in the bonding or may be contributed by only one of the atoms. In covalent bonding, molecules rather than ions are formed.
The expression CaCO3 → CaO + CO2 is an example of a
Answer:carbin dioxide co^2
Explanation:
