Answer:
Cause(s) the temperature of the surroundings to decrease. - 1. Endothermic reaction.
Cause(s) a change in the temperature of the surroundings. - 3. Both.
Cracking open a cold-pack. - 1. Endothermic reaction.
Burning Wood. - 2. Exothermic reaction.
Absorb(s) energy from the surroundings. - 1. Endothermic reaction.
Cause(s) the temperature of the surroundings to increase. - 2. Exothermic reaction.
Release(s) energy to the surroundings. - 2. Exothermic reaction.
Consider the model of the nitrogen atom which electron configuration matches the model
Answer:
1s², 2s², 2p³
Explanation:
The atomic number of Nitrogen is seven. So it contains seven protons and seven electrons in neutral form. Also, the electronic configuration cited above contains seven electrons among which two electrons are present in first shell and five electrons are present in valence shell respectively.
how many moles of H2O will be produced from 6 moles of 02
Answer: 12 moles H20
Explanation:
The tools of choice for stoichiometry problems will always be the mole ratios that exist between the chemical species that take part in the reaction.
2H2 [g] + O2 [g]------> 2H 2O (1]]
Any moving object has _______________ energy A.kinetic B.potential C.gravitational potential
Answer:
Kinetic
Explanation:
potential means it has the POTENTIAL to move, gravitational potential energy is when an object isn't moving but the it turns into gravitational kinetic energy since gravity causes it to move. since the object in question is already in motion it proves kinetic energy as the answer.
why is the renewable energy resource you chose is negative?
Answer:
There’s a high need for energy storage and are very expensive. Renewable energy is also not always available because some need sun while others need wind.
Explanation:
What forces does an electrically charge object experience because of its charge?
Answer:
electric force and newtons law
Explanation:
Oxygen is an example of a(n)
A. heterogeneous mixture
B. compound
C. element
O
OD. homogenous mixture
Reset Selection
Answer:
C. element. oxygen is an element
Explanation:
oxygen is element #8
A5.3 * 1012 kg satellite is 1.800 m from another satellite that has a mass of 3.5 x 108 kg. What is the gravitational
force between the satellites?
3.82 x 10N
6.87 x 107N
5.72 % 1014 N
1.03 * 1018 N
Answer:
The gravitational force between the satellites is [tex]3.81\times 10^{10}\ N[/tex].
Explanation:
Mass of satellite 1, [tex]m_1=5.3\times 10^{12}\ kg[/tex]
Mass of satellite 2, [tex]m_2=3.5\times 10^8\ kg[/tex]
Distance between masses is 1.8 m
It is required to find the gravitational force between the satellites. The formula used to find the force between two masses is given by :
[tex]F=G\dfrac{m_1m_2}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{5.3\times 10^{12}\times 3.5\times 10^8}{(1.8)^2}\\\\F=3.81\times 10^{10}\ N[/tex]
So, the gravitational force between the satellites is [tex]3.81\times 10^{10}\ N[/tex].
A beaker contains 41.3 mL of pentane ( C5H12 , density is 0.626 g/mL). Determine how many C atoms this liquid contains.
Answer:
41.3 mL OF PENTANE CONTAINS 62.608 *10^-27 CARBON ATOMS.
Explanation:
Volume of Pentane = 41.3 mL
Density = 0.626 g/mL
Since density is defined as mass per unit volume. Calculate the mass:
Density = mass / volume
Mass = density * volume
Mass = 0.626 g/mL * 41.3 mL
Mass = 0.015 g of pentane
Molar mass of pentane C5H12 = ( 12* 5 + 1*12) = 60 + 12 = 72 g/mol
Number of moles = mass / molar mass
Number of moles = 0.015 g / 72 g/mol
Number of moles = 2.08 * 10^-4 moles.
Since 1 mole of pentane contains 5 moles of carbon, we can then calculate how many moles of csrbon 2.08*10^-4 moles will contain
1 mole of pentane = 5 moles of carbon
2.08 *10^-4 moles = x moles
x mole = 5 * 2.08*10^-4
x mole = 10.4 *10^-4 moles of carbon
In other words, 10.4*10^-4 moles of carbon is present in 41.3 mL of pentane
We can then calculate the number of carbon atoms present in the liquid using:
From 1 mole containing 6.02 *10^-23 atoms, 10.4 *10^-4 moles of pentane will contain:
1 mole = 6.02*10^-23 atoms
10.4 *10^-4 moles = (6.02*10^-23 * 10.4 *10^-4) atoms of pentane
= 62.608 *10 ^-27 atoms of pentane.
So therefore, 41.3 mL of pentane will contain 62.608 * 10 ^-27 carbon atoms
The number of C atoms in 41.3 mL of pentane (C₅H₁₂) of density 0.626 g/mL is 2.16x10²³.
To find the number of C atoms in pentane, we need to find the number of moles.
We can calculate the mass from the density:
[tex] d = \frac{m}{V} [/tex]
Where:
d: is the density = 0.626 g/mL
V: is the volume = 41.3 mL
The mass is:
[tex] m = d*V = 0.626 g/mL*41.3 mL = 25.85 g [/tex]
Now, with the molecular weight of the pentane, we can calculate the number of moles:
[tex] \eta = \frac{m}{M} = \frac{25.85 g}{72.15 g/mol} = 0.358 \:moles [/tex]
The number of C atoms can be found with Avogadro's number:
[tex] n_{C} = \frac{6.022\cdot 10^{23} \:atoms}{1\:mol}*0.358 \:moles = 2.16 \cdot 10^{23} \:atoms [/tex]
Therefore, the liquid contains 2.16x10²³ C atoms.
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what is the effect of deforestation on quantity of oxygen gass?
Answer:
There is less oxygen because there are less trees to produce it.
Answer:
There will be less oxygen for us to breathe
Explanation:
This is because trees produce oxygen when they do photosynthesis and without as many trees we get less and less oxygen produced
Why you cannot add 0.3 moles of calcium fluoride directly to 1L of water to make a 0.3 M solution ? please only 5 mins left
Answer:
Because it's not soluble in water, need to be heated acidic solution
Explanation:
Calcium Fluoride Formula: CaF2 Comprises of Ca2+ and F−
H2O = Water H+ O2- OH-
Insoluble in water
In order to dissolve a salt, you have to break apart the ions and hydrate them via a solvent.
Need to read
HSAB concept( Pearson acid-base concept) is an initialism for "hard and soft (Lewis) acids and bases"
So F- is a Halogen which is a Hard Base
And OH- is a Hard base as well
And H- is a soft base
So soft acids react best with soft bases and hard acids react best with hard bases.
Bases don't react with other bases.
PLEASE HELP ME ASAP! CHEMISTRY TUTOR
SEE ATTACHED
Answer:
[tex]\large \boxed{\text{-827.4 kJ}}[/tex]
Explanation:
We have three equations:
1. 2H₂S(g) + O₂(g) ⟶ 2S(s, rhombic) + 2H₂O(g) ; ∆H = -442.4 kJ
2. S(s, rhombic) + O₂(g) ⟶ SO₂(g); ∆H = -296.8 kJ
3. PbO(s) + H₂S(g) ⟶ PbS(s) + SO₂(g); ∆H = -104.3 kJ
From these, we must devise the target equation:
4. 2PbS(s) + 3O₂(g) ⟶2PbO(s) + 2SO₂(g); ΔH = ?
The target equation has PbS(s) on the left, so you reverse Equation 3 and double it.
When you reverse an equation, you reverse the sign of its ΔH.
When you double an equation, you double its ΔH.
5. 2PbS(s) + 2H₂O(g) ⟶ 2PbO(s) + 2H₂S(g); ∆H = 208.6 kJ
Equation 5 has 2H₂O on the left. That is not in the target equation.
You need an equation with 2H₂O on the right, so you copy Equation 1.
6. 2H₂S(g) + O₂(g) ⟶ 2S(s, rhombic) + 2H₂O(g) ; ∆H = -442.4 kJ
Equation 6 has 2S(s, rhombic) on the right. That is not in the target equation.
You need an equation with 2S(s, rhombic) on the left, so you double Equation 2.
7. 2S(s, rhombic) + 2O₂(g) ⟶ 2SO₂(g); ∆H = -593.6 kJ
Now, you add equations 5, 6, and 7, cancelling species that appear on opposite sides of the reaction arrows.
When you add equations, you add their ΔH values.
You get the target equation 4:
5. 2PbS(s) + 2H₂O(g) ⟶ 2PbO(s) + 2H₂S(g); ∆H = 208.6 kJ
6. 2H₂S(g) + O₂(g) ⟶ 2S(s) + 2H₂O(g) ; ∆H = -442.4 kJ
7. 2S(s) + 2O₂(g) ⟶ 2SO₂(g); ∆H = -593.6 kJ
4 . 2PbS(s) + 3O₂(g) ⟶ 2PbO(s) + 2SO₂(g); ΔH = -827.4 kJ
[tex]\Delta H \text{ for the reaction is $ \large \boxed{\textbf{-827.4 kJ}}$}[/tex]
How many moles are in 255 mL of a 2.35 M solution of H2SO4?
Answer:
.59925 moles
Explanation:
In the reaction, HCl + H2O produces H3O + Cl, what is the conjugate acid
Answer:
Conjugate acid is H3O
Explanation:
HCl + H2O = H3O + Cl
HCl = H+ and Cl- = Acid
H2O = OH- and H+ = Neutral as equal OH- and H+
H3O = H3O+ = Acid also known as Hydronium
Cl = Just free floating Chlorine = Cl-
Conjugate acid is H3O
Acid = A solution with more H+ ions than OH- ions.
Help please thanks you
Explanation:
Ok so water is H2O and cabon dioxide in the air is CO2, so the water goes through the carbon dioxide and makes acid rain H2SO4.
Now we have our limestone which is CaCO3.
What happens is that the acid breaks apart our limestone into Ca2+ and CO3 2-. This then reforms into Calcium bicarbonate Ca(CO3)2.
Calcium bicarbonate is soluble in water and is hence washed away by the rain eroding the limestone.
For the following compound, determine each element and if the element is a metal or nonmetal. Also determine if the compound has an ionic, covalent, or metallic bond:
NaCl
SO2
CaO
HF
NO2
H2O
Acid, Base, or Saft?
USE THE ARRHENIUS DEFINITION TO CLASSIFY IF THE SUBSTANCE IS AN ACID, BASE, OR SALT
» MgF2
» H2SO4
Answer:
MgF2 - Salt
H2SO4 - Acid
Explanation:
Arrhenius Definition
Arrhenius acid is a substance that dissociates in water to form hydroxide (H+) ions.
Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions.
H+
OH-
S2-
O2-
MgF2 - Salt as no Hydrogen
H2SO4 - Acid as converts to HSO4- and H+ upon dissociation in water.
Liquid acetone is ______________.
A incompressible and has a definite shape.
B compressible and has definite volume.
C incompressible and has an indefinite shape.
D compressible and has an indefinite volume.
Classify the following as an element, compound, homogeneous mixture, or heterogeneous
mixture:
Hydrogen (H2)
A. Element
B. Compound
C. Homogenous mixture
D. Heterogenous mixture
why the renewable energy resource you chose is positive
Answer:
Renewable energy require less overall maintenance than generators that use traditional fuel sources. Renewable energy has numerous health and environmental benefits.
Explanation:
1. How many acetate ions are in the compound strontium acetate?
Answer: 2 Acetate ions
Explanation:
Strontium Acetate, has the molecular formular to be; C4H6O4Sr ( or in a linear form, Sr(CH3COO)2), contains two acetate ions.
In one molecule of strontium acetate (Sr(CH₃COO)₂), there are two acetate ions (CH₃COO⁻).
We must first comprehend the chemical composition of strontium acetate in order to calculate the quantity of acetate ions present.
Acetate ions (CH₃COO⁻) and strontium ions (Sr²⁺) combine to linear form the ionic compound strontium acetate. Sr(CH₃COO)₂ is the chemical formula for strontium acetate.
(CH₃COO)₂ stands for two acetate ions in the formula. The (CH₃COO⁻) ion, also referred to as the acetate ion, is a polyatomic ion made up of two carbon (C), three hydrogen (H), and two oxygen (O) atoms. It has a -1 charge overall.
Thus, there are two acetate ions (CH₃COO⁻) in a single molecule of strontium acetate (Sr(CH₃COO)₂).
It's crucial to understand that in ionic compounds like strontium acetate, the ratio of positively charged ions (cations) to negatively charged ions (anions) must be balanced in order to produce a neutral compound. In this instance, the two -1 charges of the acetate ions (CH₃COO⁻) counterbalance the two +2 charges of the strontium ions (Sr²⁺), creating a neutral molecule.
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The bridge over the river has a weight limit of 12.65 tons to cross it. The truck weighs 10.89 tons. How many tons is the truck under the weight limit
Answer:
It is 1.76 tons under the weight limit.
Explanation:
12.65
-10.89
= 1.76
What does the law of conservation of matter show?
A. That the total number of atoms in matter will never change.
B. That matter can never change form.
C. That atoms will combine in the simplest possible arrangement.
D. That atoms in matter can never be rearranged.
Answer: A) That the total number of atoms in matter will never change.
Explanation: Matter cannot be destroyed nor created. Matter is made up of atoms. The amount of atoms in an object will never change, even when changed into a different form.
Ex. When ice cubes melt there is still the same amount of water just in a different form.
Answer:
A
Explanation:
What determines how much kinetic energy an object has?
A.Mass and speed/velocity
B.only speed
C.Only mass
D.Height and mass
if an experiment produces 5g but should have made 500 g what is the percent yield
Aluminum hydroxide is often present in antacids to neutralize stomach acid (HCl). If 14.0 g aluminum hydroxide is present in an antacid tablet, determine the theoretical yield of aluminum chloride produced when the tablet reacts with stomach acid. If the actual yield of the aluminum chloride from this tablet is 22.0 g, what is the percent yield?
Answer:
Percent Yield = 91.97%
Explanation:
Aluminum hydroxide Formula: Al(OH)3 Molar mass: 78 g/mol
Stomach acid Formula: HCl Molar mass: 36.46 g/mol
Aluminum Chloride Formula: AlCl₃ Molar mass: 133.34 g/mol
14g Al(OH)3
2Al(OH)3 + Cl2 → 2Al(OH)3Cl
Balanced equation
14/156 = 0.0897 Moles of Al(OH)3
Ratio is 2:1:2 so same ratio for Al(OH)3 to AlCl₃
0.0897 x 266.68 = 23.92grams of AlCl₃
Theoretical yield of aluminum chloride
Actual yield aluminum chloride 22.0 g
Percent yield?
Percent Yield = (actual Yield/Theoretical yield) x 100
Percent Yield = (22/23.92) x 100
Percent Yield = 91.97%
The percent yield of aluminum chloride in the neutralization reaction has been 91.97%.
The balanced reaction for neutralization of stomach acid with aluminum hydroxide has been:
[tex]\rm Al(OH)_3\;+\;3\;HC\l\rightarrow\;AlCl_3\;+\;3\;H_2O[/tex]
The reaction has been determined that 1 mole of aluminum hydroxide forms 1 mole of aluminum chloride. The moles of aluminum hydroxide has been given as:
Moles = [tex]\rm \dfrac{Mass}{Molecular\;mass}[/tex]
Moles of Aluminum hydroxide = [tex]\rm \dfrac{14}{156}[/tex]
Moles of Aluminum hydroxide = 0.0897 mol.
Thus, the aluminum chloride formed has been:
1 mole Aluminum hydroxide = 1 mole aluminum chloride
0.0897 mole aluminum hydroxide = 0.0897 mole aluminum chloride
The mass of Aluminum chloride formed has been:
0.0897 mole aluminum chloride = [tex]\rm \dfrac{Mass}{266.68}[/tex]
Mass of Aluminum chloride = 0.0897 mol × 266.68 g/mol
Mass of Aluminum chloride = 23.92 grams
The %yield can be given as:
%Yield = [tex]\rm \dfrac{Actual\;yield}{Theoretical\;yield}\;\times\;100[/tex]
The theoretical yield = 23.92 grams
The actual yield = 22 grams
% Yield = [tex]\rm \dfrac{22}{23.92}\;\times\;100[/tex]
% Yield = 91.97%.
The percent yield of aluminum chloride in the neutralization reaction has been 91.97%.
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A planetary explorer vehicle
on Earth weighs 1850
pounds, what would it weigh
on the surface of Neptune,
which has 1.2 times the
gravity of Earth?
A. more than on the Earth
B. less than on the Earth
C. the same as on Earth
Answer:
more
Explanation:
Answer:
A. More than on the Earth
Explanation:
The chemical formula of a compound describes the elements the compound contains and the
A.pH of the compound.
B.conduction of the compound.
C.ratio of elements in the compound.
D.ratio of neutrons to protons in each element.
Answer:
C.ratio of elements in the compound.
Explanation:
A compound is a substance that constitutes two or more elements in a defined proportion. A chemical compound is different from another compound in what it contains i.e. elements. A chemical formula shows the elements contained in a specific compound. For example, the chemical formula of sodium chloride (NaCl) shows us that it contains Sodium (Na) and Chlorine (Cl) elements as represented by symbols.
In addition to this, a chemical formula also shows the ratio of each element that makes up the compound. An element can have more than one atom in a compound. For example, CaCl2 is the chemical formula for Calcium chloride and it shows is that the ratio of Calcium (Ca) to Chlorine (Cl) is 1:2.
The correct answer is C, the ratio of elements in the compound.
Compound:-
A compound is a substance that constitutes two or more elements in a defined proportion. A chemical compound is different from another compound in what it contains i.e. elements.
Chemical formula:-It shows the elements contained in a specific compound. For example, the chemical formula of sodium chloride (NaCl) shows us that it contains Sodium (Na) and Chlorine (Cl) elements as represented by symbols. A chemical formula also shows the ratio of each element that makes up the compound. An element can have more than one atom in a compound. For example, [tex]MgCl_2[/tex] is the chemical formula for Magnesium chloride and it shows that the ratio of Magnesium to Chlorine (Cl) is 1:2.Hence, the correct answer is C.
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Describe the location of the shoulder blade to the collarbone.
Need help, thank you!
Answer:
B the answer is B thank you
please help quick im on a test and i only got an few mins left
What Is the Reactivity Series? ...
How Do Glow Sticks Glow? ...
How Do You Get Different Coloured Fireworks? ...
What Is an Alloy? ...
Answer:
hey
Explanation:
Answer:
I'm really not sure
Explanation:
So there's the answer