Answer a) 12 neutrons
b) 12 electrons
a) 12 protons
Explanation:
The atomic number is the number of protons in an atom and is also the number of electrons
therefore, the number of protons and electrons = 12
the mass number of an element is = # of protons + # of neutrons
if we rearrange it to find # of neutrons,
# of neutrons = mass number - # of protons
so, 24 - 12 = 12 neutrons
3)
Which fossil would you be most likely to find in a coal mine?
A)
dinosaur
B)
fem
human
D)
whale
Answer:
A
Explanation:
I think it is A because a dinosaurs are extinct so it wold be possible to find a dinosaur fossil in the coal mine.
Rainfall is an abiotic factor. If rainfall in an ecosystem decreases, what happens to the amount of vegetation?
A. The amount of vegetation increases.
B. The amount of vegetation decreases.
C. The amount of vegetation stays the same.
D. The amount of vegetation first decreases than increases.
Answer:
B. The amount of vegetation decreases.
Explanation:
plants can't grow without rain
Putting your ear to a wall will allows you to hear the noise the other side better than through the air. (True or False) Explain?
Based on the information given, it should be noted that sound travels through air, and putting your ear to a wall will not allow the person to hear the noise on the other side better. Therefore, it is false.
How does sound travel?It should be noted that when sound is created, the air particles vibrate and collide with each other. The vibrating particles pass the sound through to a person's ear and then vibrate in the eardrum.
Sound travels through air, and putting your ear to a wall will not allow the person to hear the noise on the other side better. In such a case, the noise will be better heard when it travels through the air.
In conclusion, sound needs a medium such as air to travel.
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Which material property is most directly related to the x-axis value at the x-intercept of the interatomic force versus distance curve
Answer:
Explanation:
The mechanical properties of a material affect how it behaves as it is loaded. The elastic modulus of the material affects how much it deflects under a load, and the strength of the material determines the stresses that it can withstand before it fails
WILL AWARD BRAINLIEST! HELP ME OUT PLESSE! I NEED HELP WITH THIS!
3LiOH(aq)+VCI3(aq) --> 3LiCl(aq)+V(OH)3(s)
what is the complete ionic equation?
what is the net ionic equation?
what are the spectator ions?
Answer:
LiOH (aq) + VCl3(aq) ---> LiCl(aq) + V(OH)3(s) - unbalanced
3LiOH (aq) + VCl3(aq) ---> 3LiCl(aq) + V(OH)3(s) - balanced
3Li+OH- (aq) + V3+(Cl-)3(aq) ---> 3Li+Cl-(aq) + V3+(OH-)3(s) - showing ions
3Li+(aq) + 3OH- (aq) + V3+(aq) + 3Cl-(aq) ---> 3Li+(aq) + 3Cl-(aq) + V3+(OH-)3(s) (some courses don't show the charges in insoluble ionic compounds - so V(OH)3(s)) - Showing soluble ionic compounds as separate ions.
3OH- (aq) + V3+(aq) ---> V3+(OH-)3(s) (or V(OH)3(s)) - without spectator ions
Explanation:
i don't know if this is right ore not but i hope this helps even if it is just a little bit sorry if this does not help i truly apologize
Answer:
What is the complete ionic equation? (answer:a molecular equation that separates the molecules into their ion forms. )
What is the net ionic equation? (answer: he net ionic equation is the chemical equation that shows only those elements, compounds, and ions that are directly involved in the chemical reaction. )
What are the spectator ion? ( answer: Ions that are not changed in the reaction)
Explanation:
Lakes freeze from the top to bottom since ice is more dense than water.
True
False
Answer:
true because the ice freezes the top water and then freezes the water on the bottom of the lake.
please help look at picture
Formation
1, 2, 5, 8, 9, 10, 11, 24, 28, 34
Single Replacement
14, 15*, 25, 32
Double Replacement
7, 13, 16, 17, 18, 26*, 30, 33, 35
Combustion
6, 19, 20, 21
Decomposition
3, 4, 12, 22, 23, 27, 29, 31
*I'm unsure of these two
1) 2 1 2 14) 2 3 2 3 27) 1 1 1
2) 3 2 2 15) 2 2 2 1 28) 4 6 1 2
3) 2 4 3 16) 2 3 2 3 29) 1 12 11
4) 2 2 3 17) 3 2 1 6 30) 2 1 2 1
5) 1 8 8 18) 3 1 1 3 31) 1 1 1
6) 2 7 4 6 19) 1 5 3 4 32) 1 2 2 1
7) 1 3 2 3 20) 2 5 4 2 33) 1 2 1 2
8) 1 5 2 21) 2 15 12 6 34) 2 1 2
9) 1 6 1 8 22) 2 2 1 35) 1 1 1 1
10) 2 3 2 23) 2 4 3
11) 4 3 2 24) 4 3 2
12) 2 2 3 25) 1 4 2 2
13) 1 2 1 2 26) 1 2 1 1 1
Describe the model rigid rotor, both mathematically and its meaning.
Answer: An arbitrary rigid rotor is a 3-dimensional rigid object, such as a top
Explanation: The rigid rotor is a mechanical model of rotating systems. ... A special rigid rotor is a linear rotor requiring only two angles to describe, for example, a diatomic molecule. More general molecules are 3-dimensional, such as water (asymmetric rotor), ammonia (symmetric rotor), or methane (spherical rotor).
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Christian is conducting a survey to find out what technology device is the most popular. He wants to make sure his question is relevant to his topic. What question should Christian ask on his survey?
(A) How many hours do you spend on technology every day?
(B) What do you use your technology devices for?
(C) Do you have a technology device?
(D) What technology devices do you use every day?
Balance the following chemical equation (if necessary):
NH4NO2 (s) → N2(g) + H2O (I)
Original Chemical Equation
[tex]NH_{4}NO_{2}_{(s)}\ ->\ N_{2}_{(g)}+H_{2}O_{(l)}[/tex]
Balanced Chemical Equation
[tex]NH_{4}NO_{2}_{(s)}\ ->\ N_{2}_{(g)}+2\ H_{2}O_{(l)}[/tex]
Just put a two in front of water and that should balance out the oxygen and hydrogen.
Answer:
NH4NO2 (s) → N2(g) + 2H2O (I)
Explanation:
On the left side we have 2 atoms of N, 4 of hydrogen and 2 of oxygen, on the left side we have 2 of N, we had 2 of hydrogen ans 1 of oxygen and we balanced it by adding the 2 in front of H20 this way we have 4 atoms of hydrogen ans 2 of oxygen.
Molar mass of a compound is 90.07 g/mol. Determine its molecular formula if its empirical
formula is CH20
[tex]\qquad[/tex] ☀️[tex]\pink{\bf{ {Answer = \: \: C_3H_6O_3 }}} [/tex]
For this question –
Molar formula will be =[tex]\bf {( CH_2O)}_n [/tex]Now, let's find out value of n. Where–
[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf n = \dfrac{ Molar \:Mass }{Empirical \:Mass }} [/tex]
Empirical Mass of [tex]\bf CH_2O [/tex]–
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf 12 + 1×2 + 16[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf 30 [/tex]
Now, we are given, mass of compound is 90.07 g/mol.
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf n = \dfrac{ Molar\: Mass }{Empirical\: Mass } [/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf n = \dfrac{90.07}{30}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf n = \cancel{ \dfrac{90.07}{30}}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf n = 3.0023[/tex]
[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf n = 3 }[/tex]
Molar formula will be –
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf {( CH_2O)}_n [/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf {( CH_2O)}_3[/tex]
[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\sf C_3H_6O_3}[/tex]
Henceforth, Molar formula will be [tex] \bf C_3H_6O_3[/tex]The molecular formula of a compound whose empirical formula is CH20, is C3H6O3.
HOW TO CALCULATE MOLECULAR FORMULA?The molecular formula of a compound can be calculated from the empirical formula as follows:
Empirical formula = CH2O.
(CH2O)n = 90.07g/mol
(12 + 2 + 16)n = 90.07
30n = 90.07
n = 3.00
If n = 3, the molecular formula of the compound will be (CH2O)3 = C3H6O3.
Therefore, molecular formula of a compound whose empirical formula is CH20, is C3H6O3.
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What is the concentration of a solution with a volume of 660 mL that contains 33.4 grams of aluminum acetate?
Answer:
The concentration is 50.6 g/L
Explanation:
pa BRAINLYES PO TY
Which of the following pairs of elements do you expect to be most similar? argon and bromine titanium and gallium nitrogen and oxygen germanium and arsenic lithium and sodium
The pair of elements expected to be most similar would be lithium and sodium.
The periodic tableElements are arranged in the periodic table according to their atomic numbers while elements with similar properties are placed in the same group.
Argon (noble gas) and bromine (halogen) belong to different groupsTitanium (group 4) and gallium (group 13) belong to different groupsNitrogen (group 15) and oxygen (group 16) belong to different groupsOnly Lithium (group 1) and Sodium (group 1) belong to the same group.More on the periodic table can be found here: https://brainly.com/question/11155928?referrer=searchResults
If 4.7 mol of ethane, C2H6, undergo combustion according to: 2 C2H6 + 7 O2 4 CO2 + 6 H2O How many moles of oxygen are required?
Part B
Calculate the mass of water produced when 9.21 g of butane reacts with excess oxygen.
Express your answer to three significant figures and include the appropriate units.
Answer:
5.83g C4H10 x (1 mol C4H10/58.05 g (molar mass of C4H10) x (10 mol H2O/ 2 mol C4H10) x (18.002 g H2O (molar mass of H2O)/ 1 mol H2O=
Answer: 9.04 g of H2O
Explanation:
First set up equation: C4H10 (g)+ O2(g) -> CO2(g) + H2O(g)
Next balance it: 2C4H10 (g)+ 13O2(g) -> 8CO2(g) + 10H2O (g)
Use equation to get moles and plug given
5.83g C4H10 x (1 mol C4H10/58.05 g (molar mass of C4H10) x (10 mol H2O/ 2 mol C4H10) x (18.002 g H2O (molar mass of H2O)/ 1 mol H2O
what is the correct answer for the calculation of a volume (in ml) with measured numbers 28.58/16x8.0
Answer:
45
Explanation:
the answer is 45 due to the calculation of the master calculation
i need help w these 2 questions
Answer:
1. a = 2, b = 1 and c = 2
2. a = 1, b = 3, c = 2 and d = 2
Explanation:
According to law of conservation of mass, the mass can neither be created nor destroyed.
Hence, for a chemical equation the left hand side should be equal to the right hand side.
Therefore, the two balanced equations are;
2 CO + O₂ → 2 CO₂
C₂H₄ + 3 O₂ → 2 CO₂ + 2 H₂O
Cassidee walks 1-mile north and then turns and walks 2 miles west. Distance Displacement
Answer:
3 miles?
Explanation:
if you walk one mile North and then turn and walk another two miles you walk 3 miles and then turn around and walk back in the same direction you would end backup at the one-mile Mark he began. So three miles there two miles back
Cassidee traveled a distance of approximately 2.24 miles. Her displacement was approximately 2.24 miles westward.
Cassidee's motion forms a right triangle. Her first leg is 1 mile north, and her second leg is 2 miles west. Using the Pythagorean theorem:
Distance = √(1 mile)² + (2 miles)²
Distance = √1 + 4 = √5 ≈ 2.24 miles.
For displacement, we consider her initial and final positions. The horizontal component (westward) is 2 miles, and the vertical component (northward) is 1 mile. Using the Pythagorean theorem:
Displacement = √(Horizontal)² + (Vertical)²
Displacement = √2² + 1²
Displacement ≈ √4 + 1 = √5 ≈ 2.24 miles.
However, displacement needs a direction. Since she moves west, displacement is -2 miles west.
In summary, Cassidee traveled a distance of approximately 2.24 miles. Her displacement was approximately 2.24 miles westward.
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At 460 K, the rate constant for this reaction is k = 5.8 × 10–6 s–1 and the activation energy is Ea = 265 kJ/mol. What is the frequency factor for this reaction?
The frequency factor from the calculation is 7.1 × 10^25.
What is the Arrhenius Equation?The Arrhenius theory holds that the reaction between molecules owes to the collision between the reactant species. The reacting molecules must posses energy in excess of a minimum amount called the activation energy.
From the theory;
k = A e^-Ea/RT
k = rate constant
A = collision factor
Ea = activation energy
R = gas constant
T = Absolute temperature
5.8 × 10–6 = Ae^-(265 × 10^3/8.314 × 460)
A = 5.8 × 10^–6/8.1 × 10^-31
A = 7.1 × 10^25
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A 100.0g sample of eighteen karat gold contains 75g of gold and 25.0g of other metals. What is the percent of gold in the sample
Answer:
Percent of gold = 75/100 × 100
= 75 %
Explanation:
!
Mars is known as the red planet, and Neptune is known as the icy blue planet. What is a common characteristic between Mars and Neptune?
(A)They both have an atmosphere.
(B) They both have rings of gases and rocks.
(C)They are made mostly of ice and gas.
(D)They are made mostly of rock.
Answer:
A) they both have an atmosphere
SOS
If you need to keep a drink cold without refrigeration, you must minimize the amount
of _____ energy that moves from the drink to the warmer air around it.
1.kinetic
2.thermal
3.chemical
Answer:
I think it's thermal, as it is affected by temperature
Can The collision of continental plates can push up a mountain range, after which weathering and erosion begins?
Answer:
penultimate or senile stage
Explanation:
If this decay has a half-life of 2.60 years, what mass of 72.5 g sodium-22 will remain after 15.6 years
Answer:
1.1328 g left after 15.6 years
Explanation:
First we need to find, that how many times it decays: 15.6 ÷ 2.60 = 6 times
Then we know the formula: mass of original ÷ 2^n = remaining mass.
: 72.5 ÷ 2^6 = 1.1328 g left.
Note here n is the number of time, it decays.Answer:
remaining mass = 1.13 grams (3-sig figs)
Explanation:
All radioactive decay follows 1st order kinetics and is defined by the expression ...
A = A₀e^⁻kt
A = final mass activity
A₀ = initial mass activity
k = rate constant = 0.693/t(half-life) = 0.693/2.60 yrs = 0.2665 yrs⁻¹
t = time of decay = 15.6 yrs
A = (72.5 g)(e^[-(0.2665 yrs⁻¹)(15.6yrs)] = 72.5 grams x 0.0156
= 1.13381331 grams (calc. ans.) ≅ 1.13 grams (3 sig figs)
The first chemical equation was designed by
Answer:
Jean Beguin
Explanation:
The first chemical equation was diagrammed by Jean Beguin in 1615.
suppose you use a pitcher to to estimate 1.25 qt of water ( experimental volume) . You later measured the volume more precisely and found it to be 1.34 qt (accepted volume) what is the percent error in your initial measurement. be sure to report your answer to the proper number of significant figures
The percent error in the initial measurement would be 6.47%
Percent ErrorPercent error in any measurement is mathematically given as:
absolute error/true measurement x 100%
In this case;
True measurement = 1.34 qt
Absolute Error = 1.34 - 1.25
= 0.09 qt
Percent error = 0.09/1.34 x 100%
= 6.47%
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Which of the following best describes the atmosphere of a planet?
(A)A layer of gases that surrounds the planet
(B)A surface of rock or gas that makes up the planet
(C) The number of moons that revolve around the planet
(D)The rings that surround the planet
Answer:
(A) A layer of gases that surrounds the planet
Explanation:
An atmosphere is the layer of gases that surrounds a planet. In the case of Earth, the atmosphere contains the air we breath, as well as other gases that protect us from the Sun's harmful rays.
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arrange the elements in order of increasing atomic radius.
Mg
Ba
F
S
Answer:
S, F, Mg, Ba
Explanation:
Sulfur (S) is 100pm, Fluorine (F) is 147pm, Magnesium (Mg) is 173pm, and Baruim (Ba) is 268pm
Iron(II) sulfide has a primitive cubic unit cell with sulfide ions at the lattice points.
The ionic radii of iron(II) ions and sulfide ions are 88 pm and 184 pm, respectively.
What is the density of FeS (in g/cm3)?
We have that the the density of FeS is mathematically given as
[tex]\phi=2.56h/cm^3[/tex]From the question we are told
Iron(II) sulfide has a primitive cubic unit cell with sulfide ions at the lattice points.
The ionic radii of iron(II) ions and sulfide ions are 88 pm and 184 pm, respectively.
What is the density of FeS (in g/cm3)?
DensityGenerally the equation for the Velocity is mathematically given as
[tex]V_c=a^3=(2\pi Fe^{2+}+2\pi S^{2-})^3\\\\Therefore\\\\V=a^3(2\pi*0.088+2\pi 0.184)^3\\\\V=16.98*10^{-23}\\\\Therefore\\\\\phi=n\frac{PFeion+PSion}{VNa}\\\\\phi=3*\frac{55.85+32}{16.9*10^{-23}*6.023*10^{23}}[/tex]
[tex]\phi=2.56h/cm^3[/tex][tex]\phi=2.56h/cm^3[/tex]For more information on ionic radii visit
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When 1-bromobutane is exposed to magnesium, followed by acetone and then aqueous acid, what is the resulting product
The product of the reaction when 1-bromobutane is exposed to magnesium, followed by acetone and then aqueous acid is 1-pentanol.
What is Grignard reagent?
A Grignard reagent is an alkyl magnesium halide which can be converted to different products via chemical reactions. The Grignard reagent is a synthetic route to many compounds.
The product of the reaction when 1-bromobutane is exposed to magnesium, followed by acetone and then aqueous acid is 1-pentanol.
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Answer:
2-Methyl-2-hexanol
Explanation:
1-bromobutane when reacted with Magnesium in ether forms a Grignard reagent.
The Grignard reagent reacts with carbonyl compounds to produce corresponding alcohols.
Primary alcohols are formed when the carbonyl compound is formaldehyde.
Secondary alcohols are formed when the carbonyl compound is any aldehyde other than formaldehyde.
Tertiary alcohols are formed when Grignard reagent is reacted with ketones.
In given question the carbonyl compound is Acetone (ketone) hence the final product will be a tertiary alcohol.
