Answer:
207g
Explanation:
207.2 to be more specific
Read the volume of the fluid of the graduated cylinder above. Note that each interval is equal to 0.2ml
The volume of the liquid = 8.7 ml
Further explanationGraduated cylinder is a laboratory tool used to measure the volume of liquid
Also called a measuring cylinder
Each line (marked line) on this cylinder shows a scale that shows the total volume of water.
The reading is based on a curve of the fluid formed called the meniscus. Read the measurement of the amount of fluid at the bottom of the meniscus (the position of our eyes is parallel to the level of the meniscus and the cylinder is located in a flat (not tilted) place
If we look at the picture (attached), the meniscus is located between the scale / line 8.6 and 8.8(interval 0.2 ml), so the volume of the liquid shows the number 8.7 ml
Based on the information above, which statement provides evidence that a chemical reaction has occurred?
Products release more energy than reactants
Reactants form from the atoms that make up products
There are more atoms in the products than in the reactants
Atoms that make up reactants rearrange into new products
Answer: Atoms that make up reactants rearrange into new products
Explanation:
A chemical reaction is the process of breaking down the chemical bonds of the reacting substances which are commonly called as reactants and making new bonds to form new substances commonly called as products.
The products will contain the same atoms as there are in the reactants but the bonds will rearrange to form different substances.
Every chemical reaction is accompanied with absorption or release of energy.
Not sure what to do here. It says to convert the following into formulas and states in an unbalanced equation. Please help!
Answer:
Ca2 solid state
H2O liquid state
Ca(OH)2 I believe this would be in solid state
H2 gas state
Explanation:
One mole of an atom of a substance is equal to the:
a Gram atomic mass of the element
b Gram molecular mass of the element
C Atomic number of the element
d None of the above
One mole of an atom of a substance is equal to the gram molecular mass of the element. Therefore, the correct option is option B among all the given options.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants. One mole of an atom of a substance is equal to the gram molecular mass of the element.
Therefore, the correct option is option B among all the given options.
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The highpoint of a wave is called a
Answer:
crest
Explanation:
The ability of an atom in a molecule to attract electrons is best quantified by the ________.
a. electron charge-to-mass ratio
b. electronegativity
c. first ionization potential
d. diamagnetism
e. paramagnetism
Answer:
b. electronegativity
Explanation:
The ability of an atom in a molecule to attract electrons is best quantified by the _Electronegativity_.
Electronegativity is the ability of an atom to attract a shared pair of electron which is loosely held. Polar molecules often possess such properties. The Halogen group (group 17) is famous for such property because it has the highest electronegativity in periodic table.
Which of the following set of atoms has a nonpolar covalent bond?
a. H and P
b. N and C
c. Li and O
d. Cl and Ca
Answer:
a. H and P
Explanation:
A covalent bond is formed between 2 nonmetals, which share pairs of electrons to complete the octet in their valence shells. The polarity of the bond depends on the difference in electronegativity between both atoms. If ΔEN = 0, the bond is nonpolar. If ΔEN > 0, the bond is polar.
Which of the following set of atoms has a nonpolar covalent bond?
a. H and P . YES. H and P are nonmetals and ΔEN = |EN(H)-EN(P)|=|2.1-2.1|=0.
b. N and C . NO. ΔEN = |EN(N)-EN(C)|=|3.0-2.5|=0.5.
c. Li and O. NO. Li is a metal and O is a nonmetal.
d. Cl and Ca. Ca is a metal and Cl is a nonmetal.
How do scientists define temperature
Answer:
Scientists define temperature with certain rules like the measure of the ability of a substance, or more generally of any physical system, to transfer heat energy to another physical system. The temperature of a substance is closely related to the average kinetic energy of its molecules.
Explanation:
Scientists define temperature as a measure of the average kinetic energy of the particles in a substance. In simpler terms, it reflects how fast the particles are moving within a material.
When an object is heated, its particles gain kinetic energy, leading to an increase in temperature. On the other hand, cooling reduces the average kinetic energy and results in a decrease in temperature.
Temperature is typically measured using various scales, such as Celsius, Fahrenheit, and Kelvin. Kelvin is the most commonly used scale in scientific applications since it is an absolute temperature scale, starting from absolute zero, where particles have minimal kinetic energy.
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(2 points) How many grams of K2SO4 are present in 25.0 mL of 7.00 % (m/v) solution?
Show your work. No work = no credit.
Mass of K₂SO₄ : 1.75 g
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
volume of solution = 25 ml
% (m/v)=7%
mass of K₂SO₄ :
[tex]\tt \%m/v=\dfrac{mass~of~solute}{volume~of~solution}\times 100\%\\\\7\%=\dfrac{mass~K_SO_4}{25}\times 100\%\\\\mass~K_2SO_4=7\times 25\div 100=1.75~g[/tex]
The distance from San Francisco to Los Angeles is approximately 385 miles. 1609 m = 1 mile. How many kilometers is this? Do not enter “kilometers” as part of your answer.
Answer:
619.465 kilometers
Explanation:
1609 m = 1 mile
so 385 miles is equal to 619465 meters (385 x 1609= 619465)
1000 meters = 1 km
so 619465 meters is 619.465 kilometers
why the Modern dry process is preferred to another conventional process?
What is the name of the 3 lenses that have different powers of magnification 4x, 10x and 40x
Answer:
Scanning Objective Lens (4x)
Low Power Objective (10x)
High Power Objective Lens (40x)
Explanation:
Which metal absorbs the greatest amount of heat energy
Answer:
This question is incomplete but the completed question is in the attachment below. And the correct is b
Explanation:
Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.
From the description above, it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead with the specific heat capacity of 0.129 J/(g. °C).
A student determines that the number of moles in a sample of Al2O3 is 8.3 moles. How many grams are in the sample?
Mass : 846.268 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
mass of Al₂O₃ :
MW 101,96 g/mol
mass=mole x MW
[tex]\tt 8.3\times 101.96=846.268~g[/tex]
12. Calculate the no of molecules in:
34g of ammonia molecules, NH3
Answer:
1.2 × 10²⁴ molecules NH₃
General Formulas and Concepts:
Chemistry
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Dimensional AnalysisExplanation:
Step 1: Define
34 grams NH₃
Step 2: Define conversions
Avogadro's Number
Molar Mass of N - 14.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NH₃ - 14.01 + 3(1.01) = 17.04 g/mol
Step 3: Convert
[tex]34 \ g \ NH_3(\frac{1 \ mol \ NH_3}{17.04 \ g \ NH_3} )(\frac{6.022 \cdot 10^{23} \ molecules \ NH_3}{1 \ mol \ NH_3} )[/tex] = 1.20157 × 10²⁴ molecules NH₃
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
1.20157 × 10²⁴ molecules NH₃ ≈ 1.2 × 10²⁴ molecules NH₃
Ice melting to become water is an example of a physical change.
True or false
Answer:
true
Explanation:
After ice melts into liquid water, you can refreeze it into solid ice if the temperature drops. Freezing and melting are physical changes. The substances produced during chemical changes however cannot easily change back into the original substances.
The molecule NHz contains all single bonds. False or true?
Answer:
true
Explanation:
what characteristics are shared by elements in the same period row?
Answer:
Elements in the same period have the same number of electron shells.
Explanation:
elements gain electrons and protons and become less metallic
Calculate the number of moles of Cl atoms in 1.81×1024 formula units of magnesium chloride, MgCl2.
Using the periodic table, choose the more reactive nonmetal.
Si or N
Answer:
si
Explanation:
How many moles of H2O are needed to produce 6.3 moles of H2
Answer:
H2 to O2
H2 to H2O
H20 to O2
H2O to H2
O2 to H20
O2 to H2
Explanation:
According to Graham’s law, the rate of effusion of a gas is inversely proportional to
A.
the pressure of the gas.
B.
the kinetic energy of the particles.
C.
the square root of the mass of the particles.
D.
the square root of the diffusion of the gas in another gas.
C. the square root of the mass of the particles.
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
or
[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]
From this equation shows that the greater the mass of the gas, the smaller the effusion rate of the gas and vice versa, the smaller the mass of the gas, the greater the effusion velocity.
So if both gases are at the same temperature and pressure, the above formula can apply
1s22s22p63823p64523d104p5s24d105p5
What is the name of the element?
Answer:
IODINE
Explanation:
The sublevel notation of the element:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
To find this element, we must add the powers of the each of the sublevels. This is the number of electrons in the orbital of the atom.
2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 10 + 5 = 53
This give atom has 53 electrons and we can assume it to have an atomic number of 53.
The element is IODINE
What is the total number of electrons in a S2- jon?
1.
10
2.
14
16
4.
18
the answer is D) 18 electrons
Peat, which is formed when decayed moss is compressed over time, is used for which purpose?
A.Medicine
B.Shampoo
C.Fuel
D.Makeup
(PLEASE HURRY IM GETTING TIMED)
Answer:
answer is c or fuel
Explanation:
sodium chloride is an ionic compound. Explain the difference in the ability of solid sodium chloride and molten sodium chloride to conduct electricity in terms of their structures. brainly
Explanation:
Molten sodium chloride is able to conduct electricity due to the presence of free mobile ions in solution or the molten state.
The free mobile ions are the carriers of electricity.
Solid sodium chloride does not have free mobile ions because the structure is fixed. Particles are not free to move as such. But in the molten state, free ions are able to move in the solution.A student who is feeling cold rapidly rubs their hands on their bare arms. What energy transformation is the student using to feel warmer?
A.
mechanical ---> thermal
B.
radiant ---> thermal
C.
thermal ---> chemical
D.
electrical ---> thermal
Answer:
B
Explanation:
Answer:
B.
radiant ---> thermal
Explanation:
Calculate the final temperature when 50.0 mL of water at 65.0 °C are added to 25 mL of water at 25.0 °C.
Answer:
x=51.66
Explanation:
1 ml = 1 gram
(mass) (Δt) (Cp) = (mass) (Δt) (Cp)
Substituting values into the above, we then have:
(25)(25-x)(4.184)=(50)(x-65)(4.18)
Solve for x
x= 51.6667
The final temperature is "51.67°C".
According to the question,
At 65°C,
= [tex]\frac{50}{50+25}[/tex]
= [tex]\frac{50}{75}[/tex]
= [tex]0.66667[/tex]
At 25°C,
= [tex]\frac{25}{50+25}[/tex]
= [tex]\frac{25}{75}[/tex]
= [tex]0.33333[/tex]
By multiplying the volume fractions, we get
→ [tex]65^{\circ} C\times 0.66667[/tex] = [tex]43.3334^{\circ}C[/tex]
→ [tex]25^{\circ} C\times 0.33333[/tex] = [tex]8.3333325^{\circ} C[/tex]
hence,
The final temperature will be:
= [tex]43.33334+8.333325[/tex]
= [tex]51.6666^{\circ}C[/tex]
or,
= [tex]51.67^{\circ} C[/tex]
Thus the above answer is right.
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Atom a and atom b have the same number of protons and neutrons but they do not have the same number of electrons. What statement describes the atoms
The given question is incomplete. The complete question is:
Atom a and atom b have the same number of protons and neutrons but they do not have the same number of electrons. What statement describes the atoms?
The atoms have the same chemical symbol.
The atoms have the same charge.
The atoms have different atomic numbers.
The atoms have different atomic masses.
Answer: The atoms have the same chemical symbol.
Explanation:
Atomic number is equal to the number of protons for any neutral or charged specie and is specific to a particular element. Thus two elements having same atomic number will have same chemical symbols.
Mass number is the sum of number of protons and the number of neutrons.
As atoms a nd b have same protons and neutrons , they will have same atomic number and same mass number. But as the number of electrons are different , the charge on them will be different.
Thus the correct statement is the atoms have the same chemical symbol.
Answer:
They have the same chemical symbol
Explanation:
How many outer-shell d electrons are there in each of the transition-metal ions?Mn(IV) :Co(III) :Fe(II) :Ni(II) :
Answer:
Mn(IV): 3 outer-shell d electrons
Co(III): 6 outer-shell d electrons
Fe(II): 6 outer-shell d electrons
Ni(II): 8 outer-shell d electrons
Explanation:
Mn(IV):
The ion is Mn⁴⁺, so it has lost 4 valence electrons. The ground state electronic configuration of Mn is [Ar]3d ⁵ 4s ². When the neutral atom loses 4 electrons, the electronic configuration is [Ar]3d ³.
outer-shell d electrons = 3
Co(III):
The ion is Co³⁺, so it has lost 3 valence electrons. The ground state electronic configuration of Co is [Ar]3d ⁷4s ². When the neutral atom loses 3 electrons, the electronic configuration is [Ar]3d ⁶.
outer-shell d electrons = 6
Fe(II):
The ion is Fe²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Fe is [Ar]3d ⁶4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁶.
outer-shell d electrons = 6
Ni(II):
The ion is Ni²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Ni is [Ar]3d ⁸4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁸.
outer-shell d electrons = 8
The d electron in the outer shell of each of the transition metal are:
Mn(IV): 3 d electrons in the outer shell.
Co(III): 6 d electrons.
Fe(II): 6 d electrons.
Ni(II): 8 d electrons.
What is electronic configuration?Electronic configuration is the arrangement of the electrons of an atom.
There are subshell s, p, d, f.
The electrons are arranged in these subshells.
Each element has different arrangement of electrons.
Thus, the number of d electron in each of the element is: Mn(IV) :3, Co(III) :6, Fe(II) :6, Ni(II) :8.
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