Answer:
True? I think.........
Which of the following is an acid?
a) Mg(OH)2
b) Al(OH)3
c) H2CO3
d) NH4OH
Answer:
C
Explanation:
a) is magnesium hydroxide
b) is aluminium hydroxide
c) is carbonic acid
d) is ammonium hydroxide
The engineering process defines the steps engineers take to create
technology. Which of these describes these steps in the correct order?
A. Identifying a need, researching the background of that need,
making a plan to meet the need, doing the work, evaluating the
results, looking for improvements
B. Identifying a problem, testing various solutions, researching side
effects of each solution, choosing a solution, looking to improve
the solution, planning how to test the solution
C. Identifying a problem, brainstorming solutions, researching the
background of each solution, testing solutions, choosing a
solution, production, making future improvements
D. Identifying a problem, making a solution, testing the solution,
mass production, making improvements
Answer:
A.
Explanation:
Common sense<3
Answer:
A. Identifying a need, researching the background of that need,
making a plan to meet the need, doing the work, evaluating the
results, looking for improvements
Explanation: A P EX
HELP PLZ ITS DUE IN 10 MIN "Jack's model includes one object consisting of two molecules and one object consisting of six molecules. He put 16 energy cubes in each object and stated that his model showed the two objects at equilibrium. Explain what is wrong with Jack's model."
(I know it looks long but basically I just need help with finding what's wrong with the model)
Answer: the molecules have different energy and the system is not in equilibrium
Explanation:
The model developed by Jack has the same energy for each of the two objects, but as each object is made up of a different number of molecules, in the system with more molecules, object 2, each one has approximately 2.4 less energy and the molecules of Object 1 have an E / 2 energy.
So when you book them together the molecules have different energy and the system is not in equilibrium
Jack presented the model as if the two objects were in energy balance, but this is not possible, as each object has a different number of molecules.
We can arrive at this answer because:
For the system presented in Jack's model to be in energetic balance, it would be necessary for the two objects present in the model to have the same number of molecules.This is because, with equal amounts of molecules, each object would be able to emit the same amount of energy.However, the object with fewer molecules tends to emit less energy than the object with more molecules.This allows for an uneven, unbalanced emission of energy in the system and this unevenness is not presented in Jack's model.
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An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of the aluminum ion?
Answer:
+3
Explanation:
-10 + 13 = +3
-10 IS THE NUMBER OF ELECTRONS
13 IS THE NUMBER OF PROTONS
As the aluminum ion is having 10 electrons and 13 protons, means it will be having +3 charge.
What are protons?A proton is a stable subatomic particle with the symbol p, H+, or 1H+ and an elementary charge of +1e.
It has a slightly lower mass than a neutron and has 1836 times the mass of an electron due to the proton-to-electron mass ratio.
Protons and neutrons are made up of two types of quarks: up quarks and down quarks.
Each up quark carries a +2/3 charge. Each down quark has a -1/3 charge. The electrical charge of a nuclear particle is determined by the sum of the charges of the quarks that comprise it.
Because the aluminum ion has 10 electrons and 13 protons, it will have a +3 charge.
Thus, the charge of aluminum atom is +3.
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#SPJ2
4.91 M NaOH solution (density=1.04g/ mL)
9.32 x 1024 atoms of NaOH
Explanation:
65463.68 atoms of NaOh I believe.. I really dont know sorry
conduction or convection
1.When you put your hand above a pan filled with boiling water, does your hand warm-up because of convection or conduction?
2.If you touch the pan, does your hand warm-up because of convection or conduction?
3.Based on your answers, which type of heat transfer moves heat more easily and efficiently?
Answer:
1 radiation
2 conduction
3 radiation
How does fog rising off water compare to plant growth?
The humidity in the air affects the evapotranspiration rate from the leaf surfaces. ... The use of fog and mist at this time can reduce the air temperature and increase the humidity within the plant canopy without saturating the plant medium. With more oxygen in the root zone, faster rooting occurs.
_______ mL = 500 cm^3
Answer:
500 mL
Explanation:
500 cm is equal to 500 mL
Molar mass is the molecular (formula) mass of any substance expressed in which unit?
A). moles
B). kilograms
C). liters
D). grams
D. grams
Molar mass:
The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sampleIt is given by this formula:[tex]M=\frac{m}{n}[/tex] ; where m= mass of substance in g and n= number of moles.Molar mass is expressed in grams per mole.For example: Molar mass of oxygen is 16 g/mol , Molar mass of carbon is 12g/mol.Learn more:
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You are designing a new product that requires the use of a stable, nonreactive
gas. Which gas would be most suitable?
A. Oxygen, o
B. Fluorine, F
C. Helium, He
D. Hydrogen, H
The gas which would be most suitable for the product is Helium.
What is a gas?A gas is the third state of matter in which there is little intermolecular bonding between the molecules of the substance. Gases usually occupy their container and usually have low boiling point
Gas most suitableSince Oxygen, Fluorine and Hydrogen are group 6, 7 and 1 respectively. These three gases are reactive and would only be stable when they achieve their stable octet configuration. Whereas, Helium which is a noble gas already has a stable duet configuration and is thus non-reactive.So, the gas which would be most suitable for the product is Helium.
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What is the final, balanced equation that is formed by combining these two half reactions? 2 equations: first: upper C u right arrow upper C u superscript 2 plus, plus 2 e superscript minus. Second: upper N upper O subscript 3 superscript minus, plus 2 e superscript minus, plus 2 upper H superscript plus right arrow upper n upper O subscript 2 superscript minus plus upper H subscript 2 upper O.
Answer: [tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
[tex]Cu\rightarrow Cu^{2+}+2e^-[/tex] (1)
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
[tex]NO_3^-+2e^-+2H^+\rightarrow NO_2^-+H_2O[/tex] (2)
Combining (1) and (2) we get:
[tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
What is a balanced reaction equation?
An equation is said to be balanced when the total number of atoms of each element on the right hand side of the reaction equation is equal to the total number of atoms of the same element on the left hand side of the reaction equation.
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
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Which is a chemical property of sulphur?
A. It is a solid.
B. It is combustible.
O c. It is odorless.
D. It is yellow.
O E. It has density.
A, O and D
and its sulfur luv ♡ not sulphur
Remember! All ___________________________ are __________________________
but not all Atoms are elements.
Answer:
all element are atom but all at all atom are element
Explanation:
because all atoms of an element are same whereas atom of different element are different
Write a balanced molecular, ionic, and net ionic equation for the following reaction. Assume the reaction occurs in
aqueous solution.
K2(C2O4)(aq)+CaCl2(aq) to
2KCl(aq)+ Ca(C2O4)(s)
balanced?
Ionic Equation:
Net Ionic Equation:
Answer: The balanced molecular equation is:
[tex]K_2(C_2O_4)(aq)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(C_2O_4)(s)[/tex]
The ionic equation is:
[tex]2K^+(aq)+C_2O_4^{2-}(aq)+Ca^{2+}(aq)+2Cl^-\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca(C_2O_4)(s)[/tex]
The net ionic equation:
[tex]C_2O_4^{2-}(aq)+Ca^{2+}(aq)\rightarrow Ca(C_2O_4)(s)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced molecular equation is:
[tex]K_2(C_2O_4)(aq)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(C_2O_4)(s)[/tex]
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The ionic equation is:
[tex]2K^+(aq)+C_2O_4^{2-}(aq)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca(C_2O_4)(s)[/tex]
The ions which are present on both the sides of the equation are potassium and chloride ions. and hence are not involved in net ionic equation.
The net ionic equation:
[tex]C_2O_4^{2-}(aq)+Ca^{2+}(aq)\rightarrow Ca(C_2O_4)(s)[/tex]
What is the speed of a jet that flies 3200 miles in 20 hours?
160 mph
3180 mph
3220 mph
64000 mph
Answer:160
Explanation:3200/20=160
Answer:
about 160 mph
Explanation:
What volume will 0.75 mole of oxygen gas occupy at
STP?
1). 16.8 L
2). 20.0 L
3). 22.4 L
4). 33.6 L
Answer:
Answer: Number 1 16.8 L
Answer:
16.78 liters
Explanation:
Volume occupied by oxygen gas at STP is 16.78 liters
How are seasons different North & South of the equator
Answer:
seasons experienced by the northern and southern hemisphere always differ by six months when it is summer in the northern hemisphere, it is winter in the southern hemisphere
Explanation:
Answer:
ohhhhhhh she -he was having a point
a. Identify the type of reaction shown:
Li + CaCl2 ---> LiCl + Ca
Answer:
single-replacement reactions
Explanation:
A single-replacement reaction is defined as a chemical reaction in which one strong element replace the other weak element.
The given chemical equation Li + CaCl2 ---> LiCl + Ca is an example of single-replacement reactions in which Lithium (Li) is stronger than Calcium (Ca) and replaces calcium to form bond with Chloride.
Hence, the correct answer is "single-replacement reactions".
Single displacement (replacement)
Explanation:
Single displacement (replacement) is kind of reaction in which 1 atom of reactants only change in product.
what type of chemical reaction is SrCl2 + F2 → SrF2 + Cl2
plzzz help and thank u
Answer:
sports reporter
Explanation:
wnba
What is the name of Br6F10 ?
Answer:
Bromine fluoride
covalent compounds contain
Answer: Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.
hope this helps!
Explanation:
How many atoms for each element in this compound:
5ZnSO4
Zn =
S =
O=
How many TOTAL atoms? =
The number of atoms of each element are:
The number of atoms of Zn is 5 atom.The number of atoms of S is 5 atoms.The number of atoms of O is 20 atoms.The total number of atoms is 30 atoms.From the question given above, we obtained:
5ZnSO₄
The number of each atom of each element present can be obtained as follow:
Zn = 5 × 1
Zn = 5 atoms
S = 5 × 1
S = 5 atoms
O = 5 × 4
O = 20 atoms
Total atom = atoms of (Zn + S + O)
Total atom = 5 + 5 + 20
Total atom = 30 atoms
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AgNO3 ionic or covalent
Answer:
what i need more details
Explanation:
Answer:
Ionic
Explanation:
AgNO3 is also highly soluble in water. Ionic means that the compound is composed of ions.
If a solutions is made
by adding 32 grams of
sugar to 50 Kg of
water, what would be
the percent by mass?
Answer: The mass percent is 0.064%
Explanation:
To calculate the mass percent of solute in a given solution, we use the formula:
Mass of sugar (solute) = 32 g
Mass of solvent = 50 kg = 50000 g ( 1kg=1000g)
Putting values in above equation, we get:
[tex]\text {mass percent}=\frac{32}{32+50000}\times 100=0.064\%[/tex]
Hence, the mass percent is 0.064%
Which of these make up the mass of an atom?
Answer:
Protons, neutrons and electrons, and what makes up the mass of those, well for protons and neutrons quarks, and for electrons, there are indivisible, that is nothing makes them up, they are fundamental particles, you can find them on the standard model of particle physics
Explanation:
In the tropical rainforests, birds have evolved to eat the brightly-colored fruits. The fruits have evolved their attractive color so the birds will eat them and spread their seed. What theory is this an example of? A artificial selection b coevolution c mutation d natural selection
Answer:
coevolution
Explanation:
Coevolution plays a key role in shaping the biodiversity on Earth. Coevolution is commonly defined as reciprocal evolutionary changes brought about by interactions between species, implying that interacting species impose selection on each other(Science direct).
We can see that the change that occurred in the plants of the tropical rainforests is closely related to their link to birds. The fruits evolved an attractive color so that birds, having evolved to eat the brightly-colored fruits, may eat them.
What information can a mineralogist learn from testing the mass and volume of a mineral?