Answer:
12
Explanation:
I got it from quizlet
Complete the chemical formula for each ionic compound. Consult the periodic table to help you answer the question. magnesium nitride: Mg N calcium chloride: CaCl
Answer:
Magnesium Nitride - Mg₃N₂
Calcium Chloride - CaCl₂
Explanation:
Magnesium (Mg) has a charge of +2, Nitrogen (N) has a charge of -3.
Swap the charges and you get Mg₃N₂.
Mg: 2(3) = 6
N: -3(2) = -6
The charges cancel out so the formula is correct.
Calcium (Ca) has a charge of +2, Chlorine has a charge of -1.
Swap the charges and you get CaCl₂.
Ca: 2(1) = 2
Cl: -1(2) = -2
The charges cancel out so the formula is correct.
Hope this helps. :)
Magnesium Nitride - Mg₃N₂
Calcium Chloride - CaCl₂
1. Magnesium (Mg) has a charge of +2, Nitrogen (N) has a charge of -3.
[tex]Mg^{2+}[/tex] [tex]N^{3-}[/tex]
2. Adjust the subscript on each cation and anion to balance the overall charge.
[tex]Mg_3N_2[/tex]
3. Check that the sum of charge of cation equals the sum of charges of the anions.
Mg: 2(3) = 6
N: -3(2) = -6
The charges cancel out so the formula is [tex]Mg_3N_2[/tex].
ii) 1. Calcium (Ca) has a charge of +2, Chloride (Cl) has a charge of -1.
[tex]Ca^{2+}[/tex] [tex]Cl^{-}[/tex]
2. Adjust the subscript on each cation and anion to balance the overall charge.
[tex]CaCl_2[/tex]
3. Check that the sum of charge of cation equals the sum of charges of the anions.
Ca: 2(1) = 2
Cl: -1(2) = -2
The charges cancel out so the formula is [tex]CaCl_2[/tex].
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What is a possible result of evaluating your investigation?
A. You find out why your experiment went wrong.
B. You decide you need to retest certain data.
C. All of these.
D. You find your data to be reliable.
Answer:
all of these
Explanation:
All of the given statements are possible results of evaluating your investigation.
What is an investigation?
The act of investigating or following up; study; inquiry, especially a patient or in-depth inquiry or examination; as in the investigations of a philosopher and a mathematician; a judge or a moralist.
How to Increase a Scientific Investigation's Validity?Numerous variables, such as the sample used, the researcher's bias, and the tools used in the study all have an impact on how valid the results of the study are. Validity should be regarded as a continuum; while it is feasible to increase the validity of a study's findings, 100% validity can never be attained. It is beyond the purview of this Guide to investigate in detail the large range of distinct forms of validity that have been established. In order to guarantee a high level of validity, the design of the data gathering tools is crucial. As an illustration, it's critical to be mindful of how researcher bias may affect the instruments' design.Learn more about the investigation here:
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7 g of common salt is kept in water in a dish and the dish is
heated until all the water evaporates. The weight of salt left in
the dish will be
a 9 g
b 10 g
C 79
d 89
Check It
State whether these items are metal or non metal, provide a reason why.
1. Electrical wires
2. Door handles
3. Radiator
4. Shelves in the chemical cupboard
please help!
Answer:
1. Metal.
Electrical wires are used to conduct electricity. Electrons have to flow through the wires in order to run the circuit. Only metals provide delocalized electrons that are free to move.
2. Metals, (usually)
Door handles should be strong that doesn't break easily. Metals are durable and corrosion resistant. Some metal alloys (like brass) are also found to be self-disinfecting.
3. Metals.
Radiators are usually used for emitting heat. Metals are good conductors of heat, which makes them great for making radiators.
4. Metals, (usually)
Most metals used for making chemical cupboard shelves are corrosion resistant, which causes less damage when chemical was spilled.
Answer:
1.Electrical wires - metals
They r used to conduct and transfer electricity from one place to another and therefor need to be made of metals [like copper] as they hv high electrical conductivity
Door handles - metals
They need to be corrosion resistant so dat they last longer and also there r smooth which makes it easier to hold them.
3.Radiator - metals
They r used for heat transformation and therefore they need to be made of metals as they hv high thermal conductivity [heat conductivity]
4.Shelves in the chemical cupboard - non metals
They need to be made of non metals as metals r reactive to chemicals and holes can be formed on them if a drop or two of chemicals fall on them.
Hope this helps....
Pls mark my answer as brainliest :)
Which of the measurement contain three significant figure?
Answer:
The answer is explained below
Explanation:
The question is not complete.
The correct question should be like:
Which of the measurement contain three significant figure?
500
395
0.001
0.00100
1 × 10⁻³
5 × 10²
Answer:
The following are rules applied when considering significant figures:
i) All digits are significant excluding zero. E.g of significant digits are 1,2,3,4,5,6,7,8,9
ii) Any zero that appear within or after non zero digits are significant e.g. 200, 1004, 500009
iii) Zeros before non zero digits are not significant. An example shows significant digits bolded 001, 0.0012, 001.56
iv) Zeros that come after non zero digits are significant even if the number is in decimal form. An example shows significant digits bolded 1000, 0.001200, 001.5600
Therefore:
500: It contains three significant digits
395: It contains three significant digits
0.001: It contains only one significant digits
0.00100: It contains three significant digits
1 × 10⁻³: 1 × 10⁻³ = 0.001. It contains only one significant digits
5 × 10²: 5 × 10² = 500. It contains three significant digits
The measurements that contain three significant figure are 500, 395, 0.00100 and 5 × 10²
You should think critically about scientific evidence supporting product claims because _____. A. there is no comparison group B. the product has been evaluated by a reliable source C. the information may be distorted in order to sell more D. there could be another product that is a better value for the money
Answer:
The correct answer is C. Plz mark brainiest
Explanation:
Which wave is carrying the most energy? A wave with large amplitude. A wave with very large amplitude. A wave with small amplitude. A wave with medium amplitude.
Answer:
A wave with small amplitude.
Explanation:
Amplitude us inversely proportional to energy so the smaller the amplitude, the higher the energy.
Hope it helps.
The correct answer is a wave with a very large amplitude.
What is the relationship between wave energy and amplitude?The amplitude of a wave determines how much energy it can carry.A high-energy wave has a large amplitude. A low energy wave also has a small amplitude.This energy-amplitude relationship can be stated mathematically as follows: E ∝ A²Learn more about Wave Energy-Amplitude Relationship here:-
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Medical Assistant professional
Answer:
yes
Explanation:
Is boron a metal or non metal or metalloid
Answer: Non Metal
Explanation: Boron. Boron is a non metallic element and the only non-metal of the group 13 of the periodic table the elements
a. How many moles of C are needed to react with 0.500 mol
of SO?
b. How many moles of CO are produced when 1.2 mol
of C reacts ?
c. How many moles of SO2 are required to produce 0.50 mol
of CS2?
d. How many moles of CS2 are produced when 2.5 mol
of C reacts?
Answer:
A. 1.25 moles of C.
B. 0.96 mole of CO.
C. 1 mole of SO2.
D. 0.5 mole of CS2.
Explanation:
We'll begin by writing the balanced equation for the reaction between carbon, C and sulphur (iv) oxide, SO2.
This is given below:
5C + 2SO2 → CS2 + 4CO
From the balanced equation above,
5 moles of C reacted with 2 moles of SO2 to produce 1 mole of CS2 and 4 moles of CO.
A. Determination of the number of moles of C needed to react with 0.5 mole of SO2.
This can be obtained as follow:
From the balanced equation above,
5 moles of C reacted with 2 moles of SO2.
Therefore, Xmol of C will react with 0.5 mole of SO2 i.e
Xmol of C = (5 x 0.5)/2
Xmol of C = 1.25 mole
Therefore, 1.25 moles of C is needed for the reaction.
B. Determination of the number of moles of CO produced when 1.2 moles
of C reacted.
From the balanced equation above,
5 moles of C reacted to 4 moles of CO.
Therefore, 1.2 moles of C will react to produce = (1.2 x 4)/5 = 0.96 mole of CO.
Therefore, 0.96 mole of CO was obtained from the reaction.
C. Determination of the number of moles of SO2 required to produce 0.50 mole of CS2.
This can be obtained as follow:
From the balanced equation above,
2 moles of SO2 reacted to produce 1 mole of CS2.
Therefore, Xmol of SO2 will react to produce 0.5 mole of CS2 i.e
Xmol of SO2 = (2 x 0.5)/1
Xmol of SO2 = 1 mole.
Therefore, 1 mole of SO2 is needed for the reaction.
D. Determination of the number of moles of CS2 produced when 2.5 moles of C reacted.
From the balanced equation above,
5 moles of C reacted to produce 1 mole of CS2.
Therefore, 2.5 moles of C will react to produce = (2.5 x 1)/5 = 0.5 mole of CS2.
Therefore, 0.5 mole of CS2 was produced from the reaction.
A certain shade of blue has a frequency of 7.30×1014 Hz. What is the energy of exactly one photon of this light? Planck's constant ℎ=6.626×10−34 J⋅s.
Answer:
The energy of exactly one photon of this light is 4.84*10⁻¹⁹ Joules
Explanation:
A photon is an elementary particle that, according to the principles of quantum physics, makes up light.
A photon is characterized by a wavelength, denoted by λ, or, by an energy, denoted by E.
The relationship between the amount of energy (E) transported by the photon, and its frequency (v), is determined by:
E= h*v
where, as mentioned, E is the energy v is the frequency and h is the Planck constant, whose value is 6,626 * 10⁻³⁴ Joules-sec.
In this case, the frecuency is 7.30*10¹⁴ Hz. Then:
E=6,626 * 10⁻³⁴ Joules-sec* 7.30*10¹⁴ Hz
Solving:
E= 4.84*10⁻¹⁹ Joules
The energy of exactly one photon of this light is 4.84*10⁻¹⁹ Joules
Which two compounds are used in batteries? sulfuric acid and potassium hydroxide, lithium hydroxide and nitric acid, potassium hydroxide and nitric acid ,sulfuric acid and ammonium hydroxide.
Answer:
sulfuric acid and potassium hydroxide is actually the answer, not the girls above me.
Explanation:
EDU SAID SO
The two compounds are used in batteries are sulfuric acid and potassium hydroxide.
What electrolytic compounds present in a batteries?The chemicals present in a different type of batteries are sodium chloride, sulfuric acid, hydrochloric acid, chloric acid, potassium nitrate, nitric acid, sodium hydroxide, magnesium hydroxide and sodium acetate.
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Elements with an oxidation number of 2 include which of the following?
Check all that apply.<<<
O A. Lithium
B. Magnesium
C. Potassium
D. Calcium
Answer:
b-Mg
d-Ca
Explanation:
all the group two metals have oxidation of 2
Answer:
Calcium , Magnesium
Explanation:
APEX
The table compares the number of subatomic particles in two atoms. Subatomic Particle Comparison
Atom Protons Electrons Neutrons
Q 11 11 12 R 11 10 12
Which of the following is true about the two atoms?
a) They have the same charge and same mass.
b) They have the same charge but different masses.
c) They have different charges but the same mass.
d)They have different charges and different masses.
Answer:
c) They have different charges but the same mass.
Explanation:
The atoms have a different charge from each other because one atom has one more electron than the other. They have the same mass because the number of protons and neutrons are the same in both atoms.
The given atoms have different charges and masses. So the correct option is D.
What is atomic mass?
The amount of matter that makes up an element's atom, or atomic mass. It is stated as a multiple of 1.992646547 × 10⁻²³ grams, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. One atomic mass unit (amu), on this scale, is equal to 1.660539040 × 10⁻²⁴ grams. The dalton (Da) is another name for the atomic mass unit that honors the English chemist John Dalton.
The total mass of the protons, neutrons, and electrons that make up an atom is a little bit less than the observable atomic mass. According to an equation, the energy produced during the combination of these particles is converted into binding energy, which equals the product of the mass (m) spent and the square of the velocity of light in vacuum (c), or E = mc². This discrepancy is known as the mass defect.
Therefore the correct option is D.
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PLEASE HELP! Write the full electron configuration for phosphorus, atomic symbol P, then draw an orbital box diagram that accounts for all of the electrons in phosphorus. You don’t need to include the orbital box diagram as part of your answer. Based on your drawing, explain why phosphorus is either paramagnetic or diamagnetic.
Answer:
1) The full electron configuration for phosphorus is 1s²2s²2p⁶3s²3p
2) Phosphorus is paramagnetic
Explanation:
1) To write the electron configuration, we follow the electron filling order, that is starting from 1s, to 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4f, 5s, 5p, 5d, 6s till the electrons are all accounted for (up to 58)
We note that the s orbitals can each take two electrons while the p orbital can take 6 electrons and the d orbital can take 10 electrons
The electron configuration chart for phosphorus, P, is given as follows;
1s²2s²2p⁶3s²3p.
2) Diamagnetism is the temporary magnetism is the magnetism of a material that exists in the presence of a magnetic field due to a a change in the atomic electron orbital motion
Paramagnetism is a magnetism in which a material is weakly attracted by an applied external magnetic field such that there is induced magnetism in the applied magnetic field direction
Paramagnetic materials have have unpaired electrons that give them permanent magnetic moments in the absence of an applied magnetic field as such unpaired electrons are termed paramagnetic electrons and atoms that have one or more unpaired electrons are paramagnetic
Phosphorus, with the 3 partially filled p orbitals have 3 unpaired electrons in their outermost shell giving them the overall properties of a paramagnetic materials.
How many atoms are in each elemental sample?
Express your answer using two significant figures.
A. 4.8 mol Cu
B. 5.6x10^-3 mol C
C. 20.0 mol Hg
D. 0.285 mol Na
Answer:
A. 2.9*10^24
B. 3.4*10^21
C. 1.2*10^25
D. 1.7*10^23
Explanation:
1 mol of any particle has 6.02*10^23.
A. 4.8 mol Cu* 6.02*10^23 (1/mol) ≈2.9*10^24
B. 5.6x10^-3 mol C *6.02*10^23 (1/mol) ≈3.4*10^21
C. 20.0 mol Hg*6.02*10^23 (1/mol)≈1.2*10^25
D. 0.285 mol Na*6.02*10^23 (1/mol)≈1.7*10^23
A decomposition reaction causes a chemical to break apart into two products. You measure the rate of the reaction and find that it proceeds quickly at first, but slows down over time. How would you explain this result?
A. The concentration of the starting material decreases over time.
B. The concentrations of the products decrease over time.
C. The concentration of the starting material increases over time.
D. The rate of decomposition reactions doesn't change over time; there must be a measurement error.
Answer:
A, The concentration of the starting material decreases over time.
Explanation:
The longer the reaction, the more the initial product is going to break down.
Answer:
The concentration of the starting material decreases over time.
Explanation:
Which indicator shows whether a solution is acidic or basic, but not how strong it is?
a)
pH paper
which turns blue in acids and red in bases.
Ob) pH paper which turns red in acids and blue in bases.
c) Litmus paper which turns red in acids and blue in bases.
d) Litmus paper which turns blue in acids and red in bases.
Answer:
Option C
Explanation:
Litmus paper shows only whether the solution is acidic or basic, but not how strong it is.
=> Base turns the red litmus paper blue
=> Acid turns the blue litmus paper red.
Is lithium a metal metalloid or non metal
Answer:
Metal
Explanation:
Lithium (Li), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group, lightest of the solid elements. The metal itself—which is soft, white, and lustrous—and several of its alloys and compounds are produced on an industrial scale.
Atomic number: 3
Atomic weight: 6.941
Liquid hydrogen peroxide (H2O2) breaks down into water and oxygen gas.
Answer:
i got ddoxed by skai jackson
Explanation:
it sucked
Can u please help me , I couldn’t figure it out for hours. It’s just q e not d or 6 .
Answer:
if excess acid is added to the solution, it will be more acidic.
Explanation:
The pH of potassium hydroxide= 10 (OH- ions)
pH of hydrochloric acid= 3 (H+ ions)
KOH + HCl → KCl + H2O
the pH of the solution will be 7 as it is a neutralisation reaction.
But if the acid is more in amount there will be more H+ ions and the solution will have a lower pH.
(the higher the concentration of H+ ions the more the acidic the solution,
the higher the concentration of OH- ions the more alkaline a solution is. )
Percy finds a rock in his backyard. It looks like several pebbles cemented together. Percy has found _____.
Answer:
Percy has found conglomerate.
Explanation:
Conglomerate is a sedimentary rock,formed from round fragments embedded in a cementing material such as silica
Answer:
Sedimentary rock
Explanation:
Is oxygen a metal or non metal or metalloid
Answer:
Oxygen is a non metalExplanation:
It is colour less gas
9. A bond formed between a silicon atom and an oxygen atom is likely to be
O polar covalent
O coordinate covalent
O ionic
O nonpolar covalent
The answer is
O ionic
Explanation:
A bond formed between a silicon atom and an oxygen atom is likely to be: ionic
Answer: Polar covalent
Explanation: Gradpoint
If an ecological pyramid showed these organisms, the level that would retain the most energy from the Sun is
. The level that would retain the least energy from the Sun is
.
Answer:
A pex Predator
Explanation:
When we look at the energy pyramid, we have:
0.01% - A pex Predator
0.1% - Tertiary Consumers
1% - Secondary Consumers
10% - Primary Consumers
100% - Primary Producers
So if we have the primary producers having 100% energy efficiency level from the sun, and primary consumers only get 10% by eating primary producers, etc., then a pex predators get the least; they only get 0.01% of the sun's energy.
*Sorry if the word a-pex isn't how it is supposed to be spelled. Brainly thinks it is a swearword
Which statement describes friction?
O It is perpendicular to the surfaces that rub together.
O It causes a change in motion.
O It occurs in the same direction as the push force.
O It pulls downward on a moving object.
Answer:
it is perpendicular to the surfaces that rub together
The Statement that describe friction is perpendicular to the surfaces that rub together.
What is frictionFriction is the force or resistance that act on a body in motion or when one body rub against each other.
It is the gliding and sliding that occur in a body in motion.
Therefore, The Statement that describe friction is perpendicular to the surfaces that rub together.
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A chemical reaction has the equation 2AgNO3 (aq) + Zn (s) —> 2Ag (s) + Zn(NO3)2 (aq). What type of reaction occurs between AgNo3 and Zn?
A. Synthesis
B. Double displacement
C. Decomposition
D. Single displacement
Consider the unbalanced equation for the oxidation of aluminum. _Al + _O2 Right arrow. _Al2O3 Which sequence of coefficients should be placed in the blanks to balance this equation? 2, 3, 1 1, 3, 2 4, 3, 2 3, 2, 3
Answer:
4,3,2
Explanation:
if you balance a chemical equation that is the correct coefficients to be placed in the blank space
Answer:
Coefficients = { 4, 3, 2 }
Explanation:
The previous answer is correct, but I want to show you how to balance this chemical reaction. First take a look at the number of each element present in the reactant and product side -
Reactant | Product
Aluminum = 1 Aluminum = 2
Oxygen = 2 Oxygen = 3
As you can see, if you were to double the aluminum on the reactant side, the reactant and product side with respect to aluminum would be balanced. 2 and 3 share a least common multiple of 6, so if we were to triple the amount of oxygen on the reactant side and double the amount of oxygen on the product side - either side would be balanced!
Now there is one default in this. The number of aluminum and oxygen on the product side are present as the same compound. Let us say we were to still triple the amount of oxygen on the reactant side and double the amount of oxygen on the product side. That would satisfy the oxygens. The chemical equation would then be as such -
Al + 3O2 -----> 2Al2O3
Now let us balance the number of aluminums on either side. There is 1 aluminum on the reactant side, with respect to 4 aluminums on the product side. The coefficient of aluminum on the reactant side should thus be four -
4Al + 3O2 -----> 2Al2O3
Coefficients = { 4, 3, 2 }
Examine the general structure of a molecule. C is bonded to R to the left, C O O H above right, H right, and N H 2 below left. Which functional groups are in this molecule? an alkyl halide and an alcohol a carboxylic acid and an amine an amine and an ester an aldehyde and a carboxylic acid
Answer: a carboxylic acid and an amine
Explanation: just took the test
Four atoms—Carbon (C), Oxygen (O), Hydrogen (H), and Nitrogen (N)—make up the molecule in question. Alkyl halides and carboxylic acids are two functional groups that may be distinguished from the molecule's structure.
What is alkyl halide ?A halogen atom (such a chlorine, bromine, or iodine atom) is joined to a carbon atom to form the functional group known as an alkyl halide. The C is joined to a R group, which is another name for a carbon-based group, in this molecule.
This shows that it is an alkyl halide since the C is joined to a halogen atom. A functional group called a carboxylic acid is made up of an oxygen atom and a hydrogen atom that are double-bonded to a carbon atom.
This molecule has Given that the two oxygen atoms are connected to the carbon atom and the hydrogen atom is bound to the oxygen atom, the chemical formula C O O H denotes a carboxylic acid.
The molecule in issue therefore comprises an alkyl halide as well as a carboxylic acid. No amine and ester, no aldehyde and carboxylic acid, and no amine and alcohol are present.
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which activity most contributed to economic interdependence among West African peoples? farming, hurding, textiles, trade.