Answer: B
Explanation:
The atomic number of an element is the number of protons in the nucleus of an atom of that element. Changing the number of neutrons means you get an isotope of the same element. Changing the number of electrons does not affect the atom but affects the charge of the atom. So the periodic table is arranged by increasing the number of protons or atomic numbers.
If you have a solution of 3M HCl in water, how much solute in grams is there in 250 mL?
Answer:
27.3 g HCl
Explanation:
**Be sure to arrange the conversion in a way that allows for the cancellation of units.
(Step 1)
Convert milliliters (mL) to liters (L).
1,000 mL = 1 L
250 mL 1 L
--------------- x ----------------- = 0.25 L
1,000 mL
(Step 2)
Use the molarity ratio to find the moles of HCl.
Molarity = moles / L
3 M = moles / 0.25 L
0.75 = moles
(Step 3)
Convert moles to grams using the molar mass of HCl.
Molar Mass (HCl): 1.008 g/mol + 35.453 g/mol
Molar Mass (HCl): 36.461 g/mol
0.75 moles HCl 36.461 g
-------------------------- x -------------------- = 27.3 g HCl
1 mole
Question 1 of 10
Which of the following is a testable hypothesis?
A. Green toothpaste tastes better than blue toothpaste or red
toothpaste.
B. It's wrong to not brush your teeth before you have an important
conversation with someone.
C. Smart, careful, healthy people always brush their teeth.
D. If I brush my teeth, I will get fewer cavities than if I don't brush my
teeth.
Answer:
D. If I brush my teeth, I will get fewer cavities than if I don't brush my
teeth.
Explanation:
Why is CrO named using a roman numeral, chromium (II) oxide, whereas CaOis named without a roman numeral in the name, calcium oxide?
Answer: Cr (chromium) has multiple oxidation states, while Ca (calcium) only has one.
Explanation: You only specify with a Roman numeral when the metal/positively charged ion in the compound has multiple charges. Chromium is a transition metal, and most transition metals have multiple charges. Calcium is a group 2 metal so it will only have a charge of +2.
How did Katya echazarreta make history in the science community
Answer:She became one of the six space tourists transported by Blue Origin's New Shepard spacecraft, proving that there is room in the universe for all those who strive to reach it. The ten-minute trip marked the fifth successful manned mission for Jeff Bezos' company, but the feat of a lifetime for Echazarreta.
Explanation:
See attached. Thank you :)
The first product is a secondary alcohol as shown and the last product is an alkanone.
What is reaction mechanism?The term reaction mechanism has to do with the series of steps by which a chemical reaction occurs. We know that a chemical reaction may not occur in just a single reactive encounter. We could have cases just as have been showed above where the single chemical reaction has to take place through a route that involves several steps along the reaction pathway. This long pathway of the reaction is what we have called the reaction mechanism of the given or particular reaction.
In this case, the first step in the reaction is the addition of water to the alkene and this would led to the formation of an alkanol as you can see from the image attached to the answer here . This is the product that has been labelled (a).
In the second step of the process. The strong oxidizing agents and the secondary alcohol yields the alkenone and that is the final product as shown.
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Calculate the mass of aluminium that can be formed from
1020 g of aluminium oxide. 2Al203–>4Al+3o2
Answer:
see the step by step answer is up
A 8.07 g sample of HCN is found to contain 0.299 g of H and 4.18 g of N. Find the mass of carbon in a sample of HCN with a mass of 3.28 g .
The mass of carbon in a sample of the compound is 1.46 g
What is the percent mass of Carbon in the sample of he compound?The percent mass of Carbon in the sample of he compound is calculated as follows:
Percent mass = mass of carbo/mass of sample * 10%Mass of sample of compound = 8.07 g
Mass of H = 0.299 g
Mass of N = 4.18 g
mass of carbon = 8.07 g - 0.299 g - 4.18 g
Mass of carbon = 3.591 g
Percent mass of carbon = 3.591/8.07 * 100%
Percent mass of carbon = 44.5 %
Therefore, mass of carbon in a sample of the compound with a mass of 3.28 g = 3.28 g * 44.5%
mass of carbon in a sample of the compound = 1.46 g
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The doctor orders 525 mg of a medication to be administered every 12 hours. The
medication comes in 150 mg scored tablets. How many tablets need to be administered
to the patient in one day?
Answer: 7 pills
Explanation:
A day is 24 hours so you multiply 12 x 2 and do the same to 525, 525 x 2 = 1050
then divide 1050 by 150 and you get 7
HOCN(aq)⇄H+(aq)+OCN−(aq)Ka=3×10−4
The ionization of cyanic acid, HOCN, is represented above. A certain solution of HOCN has a pH of 2.0. What is the approximate concentration of unionized HOCN(aq) in the solution?
3×10^−4M
1×10^−2M
3×10^−1M
2×10^0M
The concertation of the undissociated acid is 3×10^−1M.
What is the concentration of the unionized acid?Now let us know that the acid dissociation constant shows the extent to which the acid would be dissociated in a given time. To obtain the concentration of the unionized acid, we need to first obtain the the concentration of the hydrogen ion.
Using;
pH = 2
[H^+] = Antilog (-2) = 0.01 M
Ka = [H^+] [OCN−]/HOCN
Given that [H^+] = [OCN−] = 0.01 M
Ka = [H^+]^2/HOCN
HOCN = [H^+]^2/3×10^−4
HOCN = (0.01)^2/3×10^−4
HOCN = 3×10^−1M
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What is the molar mass of H₂CO3?
A. 61 g/mol
B. 62 g/mol
C. 30 g/mol
D. 29 g/mol
Answer:
ans is b 62 g/mole
because mass of h is 2 an carbon is 12 and 3 atoms of oxygen in 16*3 =48 adding all we get 62 g/mole
Please need help ASAP
The effect of table salt and sugar on bubbles is that sugar makes it easier to blow and stronger whereas salt makes it difficult to blow bubbles.
(i) The combination in cup 2 made blowing bubbles simpler since the bubbles lasted longer; nevertheless, when the bubbles struck something, they popped just as easily as the ones in cup 1.
(ii) However, compared to cup 1, the combination in cup 3 made blowing bubbles more challenging.
(iii) Compared to salt, which did not mix well together with liquid dish detergent and made it more difficult to blow huge, forceful bubbles, sugar was an excellent ingredient to mix with liquid dish detergent.
(iv) If we were to carry out this experiment further, we may experiment with other materials in the cups to discover which ones the liquid dish detergent reacted best with. Using cups 4 and 5 for flour and brown sugar and cup 6 for pepper, respectively. Then, we would contrast these combinations with the cups that we had already examined.
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What element completes the 7s sub level?
Answer:
Radium
Explanation:
the reaction of -COOH and -NH₂:
a) forms urea
b) creates a peptide bond
c) forms glycogen
d) forms a ketone body
The reaction of -COOH and -NH₂ creates a peptide bond.
What is peptide bond?Peptide bond is defined as a type of amide type covalent chemical bond which is formed between the two simultaneous molecules of amino acid in such a way that carboxyl group of one molecule of amino acid get attached to the NH₂ group of another molecules of Amino acid.
Formation of Peptide bondPeptide bond is formed by the elimination of water molecules.
The hydroxyl group from the carboxyl and proton hydrogen cation from NH₂ group.
Thus, we concluded that the reaction of -COOH and -NH₂ creates a peptide bond by losing—OH from the -COOH and H+ from the -NH₂.
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Zn(s) + 2HCl(aq) > H2(g) + ZnCl2 (aq)
When 25.0 g of Zn reacts, how many grams of ZnCl2 are produced?
A. 1.5 B. 0.59 C. 104 D. 25 E. 52
Taking into account the reaction stoichiometry, the correct answer is option E. when 25.0 g of Zn reacts, 52 grams of ZnCl₂ are produced.
Reaction stoichiometryIn first place, the balanced reaction is:
Zn + 2 HCl → H₂ + ZnCl₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Zn: 1 moleHCl: 2 molesH₂: 1 moleZnCl₂: 1 moleThe molar mass of the compounds is:
Zn: 65.37 g/moleHCl: 36.45 g/moleH₂: 2 g/moleZnCl₂: 136.27 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Zn: 1 mole ×65.37 g/mole= 65.37 gramsHCl: 2 moles ×36.45 g/mole= 72.9 gramsH₂: 1 mole ×2 g/mole= 2 gramsZnCl₂: 1 mole ×136.27 g/mole= 136.27 gramsMass of ZnCl₂ formedThe following rule of three can be applied: if by reaction stoichiometry 63.37 grams of Zn form 136.27 grams of ZnCl₂, 25 grams of Zn form how much mass of ZnCl₂?
mass of ZnCl₂= (25 grams of Zn× 136.27 grams of ZnCl₂)÷ 63.37 grams of Zn
mass of ZnCl₂= 53.76 grams
This mass can be considered approximately equal to 52 grams. Finally, the correct answer is option E. when 25.0 g of Zn reacts, 52 grams of ZnCl₂ are produced.
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Check all the formulas below that represent binary compounds.
NH4CL
CaS
P₂05
CaSO4
N₂O
Cl₂
Binary compound is a substance that is made up of precisely two separate components and cannot be further simplified chemically. Binary compounds include, for instance, H₂O, H₂S, and NH₃.
1. NH₄Cl - It is not a binary compound because it contains more than two elements that is Nitrogen, hydrogen and chlorine.
2. CaS - It is a binary compound because it contains two elements Calcium and sulfur.
3. P₂O₅ - It is a binary compound because it contains two elements Phosphorus and Oxygen.
3. CaSO₄ - It is not a binary compound because it contains more than two elements that is calcium, sulfur and oxygen.
4. N₂O - It is a binary compound because it contains two elements that is Nitrogen and Oxygen.
5. Cl₂- It is not a binary compound because it does not contain two different elements rather it is a diatomic molecule.
Diatomic molecules- Two atoms are chemically linked together to form diatomic molecules. A homonuclear diatomic molecule is created when two identical atoms combine, such as in the oxygen molecule (O₂). A heteronuclear diatomic molecule is created when two unidentical atoms combine, such as in the CO₂ .
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Calculate the price of energy ($/GJ) obtained from burning hydrogen, that is a product
of
CH3OH + ΔH0 → CO + H2 ,
and:
methanol density at 20C = 0.791 g/ml,
methanol molecular weight = 32.04 g/mol,
price of 100% methanol = $38/ml.
Assume that methanol thermal decomposition utilizes energy from electricity ($33/GJ)
The calculated answer is 96.7
In the chemical process of combustion, an object quickly combines with oxygen to produce heat. The original substance is referred to as the fuel, and the oxygen's source as the oxidizer. Although it is typically a liquid for airplane propulsion, the fuel can be a solid, liquid, or gas.
In an air-burning flame of pure hydrogen, hydrogen (H2) combines with oxygen (O2) to generate water (H2O), releasing energy in the process. Instead of producing pure oxygen, hydrogen combustion in ambient air can occasionally produce a tiny amount of nitrogen oxides along with the water vapor. Hydrogen can be utilized as a fuel thanks to the energy emitted.
Methanol burns in the following way: CH3OH(l)+ 23O2(g)21CO2(g)+2H2O (l)
G= [G f CO2 (g)+2 G f H2O(l)] reaction
[Gf CH3OH(l)+23Gf O2 (g)]
[−394.36+2(−237.13)]
− [−166.27+0]
=−702.35kJmol−1
How well Gibbs free energy is converted into meaningful labor
= "H reaction," "G reaction," and "100."
= −702.35×100/−726
=96.7
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The compound known as butylated hydroxytoluene, abbreviated as BHT, contains carbon, hydrogen, and oxygen. A 2.876 g
sample of BHT was combusted in an oxygen rich environment to produce 8.616 g of CO₂(g) and 2.821 g of H₂O(g).
Insert subscripts to complete the empirical formula of BHT.
Answer:15
Explanation:
3. Considering
both objects
that are about to collide in
each interaction, which system
would you predict to have the
least amount of total kinetic
energy in the system right
before the objects collide? In
each instance below, player
#84 is running at a speed of 7
miles per hour. Explain in
words and pictures using the
image on why the system you
chose would have the least
amount of total kinetic energy
before the collision by
comparing it with the two
other systems.
In a collision between two objects both objects experience forces of equal magnitude and in opposite directions. Such forces often cause one object to accelerate and gain momentum, and another to decelerate and lose momentum.
The kinetic energy of the whole system before the collision equals the kinetic energy of the whole system after the collision. If all the kinetic energy is not conserved, the collision is called an inelastic collision. For collisions between two objects, momentum is conserved. The initial momentum is non-zero, so the final momentum is non-zero. Both objects cannot be at rest. It is possible that one of the objects remained after the collision.
When two cars collide your car pushes the other car. According to Newton's 3rd law, this car is pushing your car in the opposite direction with the same force. This power slows you down. In a collision, objects always encounter momentum and momentum changes. In a collision, the momentum received by an object equals the change in velocity. The velocity change of the two objects involved in the collision is always the same.
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Steve races to the nearest taco stand at lunchtime and sees that his pedometer recorded his peak speed at 91.1 cm/s. What was Steve's peak speed in kilometers per hour?
The answer will be 3,279 km/hr.
Pedometer is a device used to measure the number of steps covered by a person.
Pedometer sensor = Step count and IMS sensor used.
Peak Speed rate recorded in the pedometer = 91.1 cm/s
1 Km = 100 * 1000 cm
1 hour = 60 * 60 = 3600 sec
Now, 1 cm = 10^-5 km
1 sec = 0.00027777777 hour
speed = 91.1 cm /s = 91.1 * 10^-5 / 0.00027777777 km/hour
speed = 3.279 km/hr
Steve's peak speed rate in km / hr would be 3.279 km/hr
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Which is true regarding percentage error?
The percentage error is calculated by multiplying the approximation value and the exact value.
The percentage error is a percentage that details how far an approximation is from the exact value after an experiment.
The percentage error is a set of inferences made by human senses and scientific equipment.
The percentage error is a percentage that states how many mistakes were made during an experiment.
The statement that is true regarding percentage error is as follows: the percentage error is a percentage that details how far an approximation is from the exact value after an experiment (option B).
What is percentage error?Percentage error is the difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage.
The percentage error in an experiment can be calculated by subtracting the actual value from the estimated value divided by the actual value, then multiplying the result by 100.
Percentage error = (Estimated value - Actual value/ Actual value) × 10
Therefore, the statement that is true regarding percentage error is as follows: the percentage error is a percentage that details how far an approximation is from the exact value after an experiment.
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When 53 J of heat is added to 15 g of a liquid, its temperature rises from 10.7 °C to
13.0°C.
What is the heat capacity of the liquid?
The heat capacity of liquid is 1.53 J/ g°C
Heat capacity measures the energy required to raise temperature of a unit mass of a substance by a unit degree
Formula used:
Q = m × c × ΔT
= m × c × ( T₂ - T₁ )
where,
Q = Amount of heat gained or lost = 53 J
m = mass of liquid = 15 g
c = specific heat of liquid = ?
ΔT = change in temperature
T₁ = initial temperature = 10.7 °C
T₂ = final temperature = 13 °C
Substituting the values in the formula
53 J = 15 g × c × ( 13 - 10.7) °C
53 J = 15 g × c × 2.3 °C
c = 53/ ( 15 × 2.3 )
= 1.53 J/ g°C
Thus we can conclude that the heat capacity of liquid is 1.53 J/ g°C
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The density of a solution of sulfuric acid is 1.8022g/cc and it is 88.00 percent by mass. What is the volume of the solution ( in millimetre) do you need to supply 43.0g of sulfuric acid.
Considering the definition of percentage by mass, you need a volume of solution of 20.9965 mL to supply 43 g of sulfuric acid.
Definition of percentage by massThe Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
percentage by mass= (mass of solute÷ mass of solution)× 100
Definition of densityDensity is a quantity that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Volume of the solution neededIn this case, you know:
density of the solution of sulfuric acid= 1.8022 g/ccpercentage composition= 88 percent by massmass of the solution= 43 gFirst, you calculate the mass of sulfuric acid considering the definition of percentage by mass:
88= (mass of solute÷ 43 g)× 100
Solving:
88÷ 100= mass of solute÷ 43 g
0.88=mass of solute÷ 43 g
0.88×43 g= mass of solute
37.84 g= mass of solute
Now, the volume is calculated taking into account the definition of density:
1.8022 g/cc= 37.84 g÷ volume
Solving
1.8022 g/cc× volume= 37.84 g
volume= 37.84 g÷ 1.8022 g/cc
volume= 20.9965 cc= 20.9965 mL (being 1 cc= 1 mL)
Finally, you need a volume of solution of 20.9965 mL to supply 43 g of sulfuric acid.
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In Chemistry we look at the composition and the_
change Y
of matter
Explanation:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds
The diagrams suggest that compounds must be
The diagrams of a chemical compound give an idea of the structure and composition of the compound.
What is a diagrammatic representation?
Because a molecular formula often does not accurately describe a single molecule, structural formulae must be created for organic compounds. Isomers are different compounds with the same chemical formula, and the abundance of organic isomers is a reflection of carbon's exceptional plasticity in creating stable bonds with both other elements and itself.
We refer to such compounds as constitutional isomers when the atoms that make up the molecules of various isomers are linked together in fundamentally different ways. The formulae share a similar structural element and represent all known and hypothetical C4H10O compounds. No double or triple bonds and no rings exist in any of these structures.
Therefore, the diagrams of a chemical compound give an idea of the compound.
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Learning Task No. 2: Study the diagram above. Answer the guide questions.
Guide Questions:
1. What do you call the force acting on the ball along the horizontal line or
along the force that makes the ball in motion?
2. What makes the ball stop on rolling after sometime?
3. What makes the ball keep on rolling?
1. "Fn" stands for "Normal Force," "Fg" for "Gravity Force," "Ff" for "Force Friction," and "A" for "Applied Force." 2. As a result of the friction, which causes the ball to stop. 3. The reason the ball rolls is due to the force that is imparted to it.
The definition of force is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. A force that opposes this motion of the hands is activated when they brush against one another. Frictional force is the force resisting motion applied in the direction perpendicular to the direction of motion of the hands.
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A tuna swam at a constant velocity of 1.2 meters per second toward a smaller fish. If the tuna swam toward the smaller fish for 7.0 seconds, how far did the tuna swim?
Write your answer to the tenths place!!!!
The tuna fish that swam at a constant velocity of 1.2 meters per second toward a smaller fish in 7 seconds swam 8.4m.
How to calculate distance?The distance moved by a moving body can be calculated by multiplying the speed by the time taken as follows:
Distance = speed × time
According to this question, a tuna swam at a constant velocity of 1.2 meters per second toward a smaller fish. If the tuna swam toward the smaller fish for 7.0 seconds, the distance is calculated as follows:
Distance = 1.2m/s × 7s
Distance = 8.4m
Therefore, the tuna fish that swam at a constant velocity of 1.2 meters per second toward a smaller fish in 7 seconds swam 8.4m.
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Answer:
i think u have to mutiply but i might be confused
i think the answer is 8.4 im not sure tho
Explanation:
calculate the moles of NaCl in 5.67 grams of NaCl?
Answer:
0.0970 moles NaCl
Explanation:
To find the amount of moles, you need to multiply the mass (grams) by the molar mass of NaCl. The molar mass exists as a ratio that compares the mass of a substance per every 1 mole. The molar mass is made up of the individual atomic masses of every element in the molecule. The final answer should have 3 sig figs like the given value (5.67 = 3 sig figs).
Atomic Mass (Na): 22.770 g/mol
Atomic Mass (Cl): 35.453 g/mol
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
5.67 grams NaCl 1 mole
---------------------------- x ------------------------- = 0.0970 moles NaCl
58.443 grams
The world's record for the largest cup of coffee was broken on
October 15. 2010. with a 2010-gal cup of coffee in Las Vegas, Ive
vada. If a cup of coffee contains 473 mL of coffee, how many
cups of coffee would be reauired to till this coffee cup
The number of cups of coffee in a 2010-gal cup of coffee is 16086 cups of coffee
What is the number of cups of coffee in a 2010-gal cup of coffee?The number of cups of coffee in a 2010-gal cup of coffee is calculated as follows:
Number of cups of coffee = volume of 2010-gal in ml/473 ml
Volume of large cup of coffee = 2010-gal
Number of mL in 1 gal = 3785.41 mL
2010 gal in mL = 2010 * 3785.41
2010 gal in mL = 7608674.1 mL
Number of cups of coffee = 7608674.1 mL/473 mL
Number of cups of coffee = 16086 cups of coffee
In conclusion, the number of cups pf coffee in 2010 gal is obtained using the conversion factor between gal and mL
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1) Complete the sentence: If a group 1 metal loses an electron, it has the electron configuration (2 correct answers)
A of the noble gas in the same period
B that has a full octet in the highest energy level
C that matches the group 17 nonmetal in the period before it
D of the noble gas in the period before it
2 Ionization energies for nonmetals are ____________ than metals because they would rather __________ electrons than lose electrons, so it takes ___________
A energy to remove an electron.
B higher, gain, more
C higher, gain, less
D lower, gain, less
HELP ME RIGHT NOW, PLEASE THANKS YOU
The accurate responses are;
1) it has the configuration of of the noble gas in the same period
2) higher, gain, more
What is the electron configuration?The electron configuration shows the arrangement of the atoms in an element. We know that in an element, the nucleus is at the core of the atom. The shells have energies increasing order with the shells that are close to the nucleus having the lowest energy and the energy of the shells tends to increase radially outwards from the nucleus.
Now let us try to look at sodium. We know that the formation of ions leads an element to attain the noble gas configuration. We can see that when sodium loses an electron, it closely resembles the noble gas neon.
The ionization energy is the energy that is required for the removal of one electron from the outermost shell of the atom. The complete statement therefore is; Ionization energies for nonmetals are higher than metals because they would rather gain electrons than lose electrons, so it takes more energy.
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Which element, Oxygen (O) or Fluorine (F), has a smaller atomic radius?
O, because the attraction between protons and valence electrons is weaker.
F, because the attraction between protons and valence electrons is stronger.
F, because the attraction between protons and valence electrons is weaker.
O, because the attraction between protons and valence electrons is stronger.
Fluorine has a smaller ionic radius than oxygen, because the attraction between protons and valence electrons is stronger; option B
What is ionic radius?Ionic radius is the radius of an ion of an element.
The ionic radius of ions of elements depends on the nuclear charge as well as the number of electrons in the outermost shell of of an ion of an element.
The nuclear charge is the charge on the nucleus as a result of the positively-charged proton present in the nucleus. The proton exerts an attractive force on the electrons, thus reducing the size of the ion if nuclear charge increases.
The ionic radius of metallic ions decrease from left to right across the period table as a result of the increase in the nuclear charge of the ions.
However, the ionic radius of metals increase on going down a group in the periodic table.
Similarly, the ionic radius of non-metallic ions decrease from left to right across the period table as a result of the increase in the nuclear charge of the ions.
The ionic radius of non-metals also increase on going down a group i the periodic table.
Therefore, the ionic radius of oxygen will be greater than that of fluorine because of a smaller nuclear charge.
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