Answers
Answer:
Student A's Date was more precise.
Explanation: Her answers are closer together whereas student B's answers are further apart in numbers.
Related Questions
32. Describe how scientific notation makes it easier to
work with very large or very small numbers.
Answers
Scientific notation makes it easier to work with very large or very small numbers because it makes a very small or large number into a shorter one.
How scientific notation makes it easier to work with very large or very small numbers?Scientific notation makes it easy to compare numbers that have very large values because all the zeroes have been replaced with small number which can be read easily. In scientific notation, numbers with a greater exponent are bigger than numbers with a small or less exponent because higher exponent shows the larger value and smaller value represents smaller value. So that's why scientific notation make easier to write or read a very large or small number.
So we can conclude that Scientific notation makes it easier to work with very large or very small numbers because it makes a very small or large number into a shorter one.
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a block has a mass of 4.465 g ad a volume of 144.2cm3 calculate the density in g/cm3
Answers
Density of given block is 0.0308 g/cm³
The measure of how densely a material is packed together is called density. As the mass per unit volume, it is defined as mass per unit Volume. Unit of density is g/cm³the cubic measurement of the area taken up by a three-dimensional object is volume.The quantity of matter that makes up a thing is referred to as its mass.unit of mass gram, kilograms etc.Given,
mass of the object is 4.465g
volume of the object is 144.2cm³
we have to find out density of object in g/cm³
we know that,
Density = mass / volume
= 4.465 / 144.2 cm³
= 0.0308 g/cm³
Therefore density of object with mass of 4.465 g and volume of 144.3cm³ is 0.0308 g/cm³.
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What is one element a topographic map shows?
Air flow
Climate
People
Relief
Answers
Answer:
Relief is one element on a topographic map
Explanation:
What volume (in L) of 1.50 M Na₂CO₃ would be required to obtain 0.650 moles of Na⁺ ions?
Answers
The Volume of Na₂CO₃ solution required to obtain 0.650 moles of Na⁺ ions is 216 mL.
What is the number of moles sodium ions produced by the dissociation of 1 mole of Na₂CO₃?The number of moles sodium ions produced by the dissociation of 1 mole of Na₂CO₃ is determined from the dissociation equation of Na₂CO₃ given below:
Na₂CO₃ (aq) → 2 Na⁺ (aq) + CO₃²⁻ (aq)
From the equation above, 1 mole of Na₂CO₃ produces 2 moles of Na⁺ ions.
Number of moles of Na₂CO₃ that will produce 0.650 moles of Na⁺ ions = 0.650/2 moles
Number of moles that will produce 0.650 moles of Na⁺ ions = 0.325 moles of Na₂CO₃ solution.
Volume of Na₂CO₃ solution required = moles of Na₂CO₃/molarityVolume of Na₂CO₃ solution required = 0.325/1.5
Volume of Na₂CO₃ solution required = 0.216 L
Volume of Na₂CO₃ solution required in mL = 216 mL
In conclusion, the volume of Na₂CO₃ solution required is obtained from the molarity and moles of Na₂CO₃.
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Which of the following processes requires more heat energy?
a. raising the temperature of 100. g of water by 10.0 °C
b. raising the temperature of 100. g of aluminum by 10.0 °C?
Answers
Raising the temperature of 100 grams of water by 10.0 C is one of those processes which requires more heat energy.
What degree of heat can 100 grams of water withstand?30.514KJ is the amount of heat can 100 grams of water withstand.
Water has a volume of 100 milliliters and weighs 100 grams. (100°C - 27°C) is the temperature difference, which equals 73°C. Water has a specific heat of 4.18 J/g/°C, thus we can apply the calculation below to determine how much energy is required. The necessary energy is equal to 30.514KJ for 100g at 73°C and 4.18 J/g/°C.
What happens to water's thermal energy as it transforms from a liquid to a solid state?Once all of its thermal energy is gone, water freezes, changing from a liquid to a solid. In our daily lives, these kinds of occurrences constantly occur. Puddles, ponds, lakes, and even parts of oceans freeze when the water gets cold enough. In colder climates, the surface water on Earth freezes and solidifies.
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What is density?
A.The volume of an object.
B.The weight of an object.
C.The measure of mass of a material within a given space.
D.The mass of an object.
+11 points
Answers
Answer:
C.The measure of mass of a material within a given space.
Explanation:
C. The measure of mass of a material within a given space.
If you ride your bicycle down a straight road for 500 m then turn around and ride back, your distance is ____your displacement.
Answers
Answer:
Greater than
Explanation:
Which subatomic particle is used to identify the atom, as it never changes?
Protons
Electrons
Neutrons
Nucleus
Answers
What is the molarity of a substance in which 10.8 grams per f calcium chloride is dissolved in enough water to make to make 125 mL of solution?
Answers
The moles of solute per liter of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grams per mole. 58.44 grams of sodium chloride dissolve in one liter of water to form a one molar solution, or 1M.
What is the molarity of a substance in which 10.8 grams per f calcium chloride is dissolved in enough water to make to make 125 mL of solution?
"2.7 moles"
Rearranging Molarity is determined by multiplying moles by litres.
Litres times molarity equals moles.
The amount of water in 125 g is similar to 125 ml, or 0.125 litre.
The number of moles is 0.125 x 2 = 0.25 mol since the molarity is 2.0M.
To get the answer of 10.8g, simply multiply this by the molar mass of calcium chloride, which is 110.98 g/mol.
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Which are reactions that release energy?
Answers
Use the periodic table to predict which ion will form from each main-group element.
Na:
F:
N:
I:
Sr:
Answers
The ions that are formed by the ions is;
Na^+F^-N^3-I^-Sr^2+What is an ion?The term ion refers to a specie that is obtained by the loss or gain of electrons. A positive ion is formed by the loss of electrons while a negative ion is formed by gain of electrons.
A positive ions has more protons than electrons while a negative ion has more electrons than protons. There is only one major ion that could be formed by main group elements.
The ions that are formed by the ions is;
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A 2.300 −g sample of quinone (C6H4O2) is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/∘C . The temperature of the calorimeter increases from 24.64 ∘C to 32.09 ∘C .What is the heat of combustion per gram of quinone?
Answers
The heat of combustion per gram of quinone is -25.43 KJ/g.
A constant-volume bomb calorimeter can be used to calculate a substance's heat of combustion. The heat absorbed by the bomb calorimeter can be compared to the heat emitted by the reaction. Additionally, it is necessary to understand the calorimeter's heat capacity.- Q(rxn) = Q(cal) = C(cal)ΔTGiven,
mass of sample = 2.300g
total heat capacity = 7.854 kJ/∘C
Temperature change = 32.09 - 24.64 = 7.45
we have to find out heat of combustion per gram of quinone.
- Q(rxn) = Q(cal) = C(cal)ΔT
Q(rxn) = -(7.854kJ/⁰C)(32.09 - 24.64)
= -58.5 KJ
Now, we will calculate heat of combustion per gram.
Q(rxn) = -58.5/2.3g = -25.43 KJ/g
negative sign denote exothermic reaction.
Thus, heat of combustion per gram of quinone is -25.43 KJ/g.
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While camping, you make a snack over a campfire. You roast a marshmallow over the campfire until it is browned and put it between some chocolate and graham crackers. When you take a bite, you notice that the chocolate and marshmallow have melted slightly.
Which statement correctly identifies a part of this process as a physical or a chemical change?
A. The melting of the chocolate is a chemical change
B. The digestion of the food is a physical change
C. The toasting of the marshmallow is a chemical change
D. The burning of the wood for the campfire is a physical change
Answers
The answer is C. The toasting of the marshmallow is a chemical change.
Why?
Based on the other options:
A.) The melting of the chocolate ISNT a chemical change. It's a physical change.
B.) The digestion of food is NOT a physical change. It's a chemical change.
D. The burning of the wood for the campfire is NOT a physical change. It's a chemical change.
Physical Change: Doesn’t change the composition of the matter. However, its physical appearance and properties can change.
Chemical Change: During chemical changes, the matter that you start with isn’t the matter you end up with.
Match each electron configuration to the correct element. Use the periodic table to determine the number of electrons that each element has. Drag the tiles to the correct boxes to complete the pairs. Tiles [Kr] 5s2 4d10 5p2 1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p6 3s2 3p6 4s2 3d10 [Ar] 4s2 3d6
Answers
[Kr]5s₂4d₁₀5p₂, 1s₂2s₂2p₆3s₂3p₅, 1s₂2s₂2p₆3s₂3p₆4s₂3d₁₀, [Ar]4s₂3d₆ are electronic configuration of tin (Sn), Chlorine (Cl), Zinc (Zn), Iron (Fe) respectively.
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electronic configurations are written using a standard notation that arranges all atomic subshells that contain electrons in a sequential order.Filling of atomic Orbitals are done by following principles: Aufbau principle, Pauli exclusion principle, and Hund's rule.The theory states that electrons fill up in the following order: 1s, 2s, 2p, 3s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, and 7s, 5f, 6d, 7p....[Kr]5s₂4d₁₀5p₂
Tin
Number of electrons = 50
1s₂2s₂2p₆3s₂3p₅
Chlorine
Number of electrons = 17
1s₂2s₂2p₆3s₂3p₆4s₂3d₁₀
Zinc
Number of electrons = 30
[Ar]4s₂3d₆
Iron
Number of electrons = 26
Hence, these electronic configuration are of Tin, chlorine, zinc, and Iron.
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Answer: screen shot below.
Explanation:
72. A 5-mL sample of water has a mass of 5g. What is the density of water?
Answers
Answer: 1 g/ml
Explanation:
5 g / 5ml= 1 g/ml
Emission and absorption line spectra both provide evidence for which of the following:
a. the existence of isotopes
b. the existence of energy levels within the atom
c. the existence of sub-atomic particles
d. the existence of ions
Answers
B. The emission and absorption line spectra both provide evidence for the existence of energy levels within the atom.
What is emission of line spectrum?
An emission of line spectrum occurs when energy is added to an atom due to difference in energy level.
An emission line will appear in a spectrum if the source emits specific wavelengths of radiation.
What is absorption line spectrum?An absorption spectrum occurs when light passes through a cold, dilute gas and atoms in the gas absorb at characteristic frequencies due to difference in energy level.
Thus, the emission and absorption line spectra both provide evidence for the existence of energy levels within the atom.
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Question 19
When the reaction here goes in the backwards direction what is acting as the base?
H3O+ PH3 PH4* + H₂O.
OPH₂*
O H₂O
OPH₂
O H₂O*
1.5 p
Answers
I don't know how to write the chemical form of glucose. Can you guys help me?
Answers
answer:
that is the chemical form of glucose.
Calculate the mass of boron present in 30 g of borax.
Answers
the mass of boron present in 30 g of borax is 1.991×10²⁴
Chemical element boron has the atomic number 5 and the letter B in its symbol. It is an amorphous brown powder and a brittle, black, glossy metalloid in its crystalline form. There may be antioxidant effects of boron. Boron is frequently used to treat vaginal yeast infections and boron insufficiency. Additionally, it is used to treat menstrual cramps, osteoarthritis, osteoporosis, and numerous other ailments, but many of these applications lack strong scientific backing.
Molar mass of B = 10.81g/mol
So, 1 mole of B = 10.81g
and 1 mole = NA= 6.023×10²³
By combining,
10.81g of B = 6.023×10²³ atoms of B thus,
35.76g of B = 6.023×10²³
10.81×35.76
35.76g of B
= 1.991*10²⁴
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Which monatomic ions would you expect potassium (Z=19) and oxygen (Z=8) to form?
Answers
The monoatomic ion of potassium is K+ and Oxygen is O2-
The term "monatomic ion" refers to an ion with only one atom. A polyatomic ion is one that has more than one atom, even if they are all from the same element.The monatomic ions generated by potassium (K) and Oxygen (O) are being askedwe will first look for the group number that an element belongs to in order to establish the charge of that element. For non-metals, the charge of the ion is calculated by deducting 8 from the group number For metals, the charge of the ion is equal to the group number.Since K is a metal, its ion is a cation with a charge of 1, and it is a member of group 1A. K+ is hence the potassium's monoatomic ion.similarly oxygen is non metal therefore the monoatomic ion of oxygen is O2−.Learn more about monoatomic ions here:
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The two main types of weathering are
mechanical and physical
physical and kinetic
chemical and physical
chemical and acidic
Carbonic acid
Answers
Answer:
chemical and mechanical/physical
Answer:
C
Explanation:
Chemical/Physical
30. What is the final volume of a 400.0 mb gas sample that is subjected to a temperature
change from 22.0 °C to 30.0 °C and a pressure change from standard pressure to 0.47 atm?
Gas Law Used:
Answers
The calculated final volume is V2 = 410.84 mL
The unit of pressure equal to the average atmospheric pressure at sea level is known as a standard atmosphere, or atm. The SI unit of pressure is the atm, which is precisely 101,325 pascals.
Standard pressure is 1 atmosphere, or 760 mm Hg, and the standard temperature is 273 Kelvin, or 0°C. In an experiment, a mole of any gas at STP takes up 22.4 litres of space. The equation has the following form: At STP, one mole of gas is 22.4 liters of gas.
V1/T1 = V2/T2
400.0/295 /V2/303 295 x V2 = 400.0 x 303 295
V2 = 121200 /V2 = 121200/295
V2 = 410.84 mL where
T1 = 22.0°C + 273
= 295 K and
T2 = 30.0°C + 273
= 303 K
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I need some help with crush advise. So basically i have a crush on this dude but i don't think he know me we are not in the same class but we see each other at morning time and recess by the way he is Vietnamese and he is cute. If you have some advice. ( PLEASE TELL ME) please don't just steal the points, really help me out
Answers
Answer:
Go for it!
Explanation:
You only live once, seriously just go up and talk to him. Say something like, "Hey, you seemed cool I just wanted to say hi. Do you have an ig?" :) you won't regret it.
Answer:
There are a couple of things you should do! first, you should become his friend, and be a good friend, too. Don't fl!rt with him when you first meet, or in the first couple of times you guys meet. Ask him things you are genuinely curious to know about him, don't ask generic questions such as " whats your favorite color" or make small talk. Ask him things that relate to him more like what's his full name, or where is he from. If you really are curious to know what his favorite color is, you can ask him, but make sure he knows you are genuinely curious to know, and not just making small talk. After getting to know him better, you have to ask yourself if you are still interested in him in "that" way, or interested at all, even. If the answer is yes, you still have love interest the next thing you should know is if he is single, or likes someone. When you ask him if hes single don't make it weird if he says no, just be chill. If he is single, but has a crush on someone you should ask him who. If he doesn't tell you and you guys are close already, it's probably you. After finding out all these things about him, you should wait about 2 months and then confess to him that you like him (if he has not already confessed to you) and no worries if he rejects you, rejection happens sometimes and it's totally okay. It may not feel like it right away, or even longer away but you will eventually get over him.
Explanation:
I hope these tips were helpful, and if you have any more questions please ask I'm here to help you <3
Which of the following values of n makes the equation n2-159=10 true?
Answers
You add 159 from itself, and add 159 to 10. Which leaves you with 2n=169, then you divide 2 to 169 and 2. And 169÷2=84.5
4521 kg into milligrams
Answers
Answer:
5421 kg = 5421000 mg
Explanation:
Hope this helps!
Answer:
4521 kg = 4521000000 milligrams
Hope this helps :)
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Can you please review the following to ensure that I'm doing this right ?
If I have a medication (powder) that is 1 gram / 100gallons of water and I want to treat a 75gallon aquarium.
1 gram = 1mL
Let's say I take 1 gram and add it to a bottle of 40mL of water. Shake it up and then draw it up with a syringe that is in MLs.
Is this the correct dimensional analysis
40MLs x 1gram/100gallons x 75 gallons = 30 MLs
So then from the solution in the bottle I would draw up 30 mLs and add that to the fish tank?
Is this correct
Answers
The volume of medication required for 75 gallons is 30 mL.
What is the correct procedure for determining the volume of a medication powder that is 1 gram / 100gallons of water required to treat a 75 gallon aquarium?The correct procedure for determining the volume of a medication powder that is 1 gram / 100gallons of water required to treat a 75 gallon aquarium is the procedure which ensures that the answer expressed in the proper units.
The required concentration of the medication is 1 gram / 100gallons of water.
Volume of water to be be treated is 75 gallon.
1 g of the medication is dissolved in 40 mL of water.
Therefore, 40 mL of the medication contains 1 g of the medication powder.
40 mL of the medication will treat 100 gallons of water.
Volume of medication required for 75 gallons will be:
Volume of medication required for 75 gallons = 40 mL * 1 g/ 100 gallons * 75 gallons
Volume of medication required for 75 gallons = 30 mL
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density is 1.53g/cm^3 what is the mass of 26.0l of this substance in kg
Answers
Mass of substance is 39.78kg
The amount of matter that makes up an object is quantified by its mass. The kilogramme or kg is the fundamental SI unit of mass.The measure of how densely a material is packed together is called density. As the mass per unit volume.Density = mass / volume
We can find out any term if the value of two terms are given in the formula.Given,
Density of the substance is 1.53g/cm³
Volume of the substance is 26 L = 26000cm³
we have to find out mass by this two terms
Density = mass / volume
1.53. = mass / 26000
mass = 26000 × 1.53
= 39780gm = 39.78kg
Therefore the mass of the given substance is 39.78kg.
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All of the following are phases of matter except *
A solid
OB liquid
OC gas
Lighting
Answers
The explanation for this question was that the same name is in your account with your account and password to the account account uuu
Answer:
lighting bru
Explanation:
What is the correct way to report the length of the rectangle in centimeters ?
Answers
The length of the rectangle is 16 cm.
What is the length of the rectangle?We know that area is the product of the rectangle is the product of the length and the breadth of the rectangle. The perimeter of the rectangle is the distance round the rectangle. In this case, the rectangle has been showed in the image attached to the question.
We can see the meter rule which is the instrument that is used in the measurement of length. The meter rule is often calibrated in accordance with the metric system or the subunits of the metric system.
Having looked at the measurement is shown in the image shown, it is then clear that the length of the rectangle is 16 cm.
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how are physical and chemical properties of each family different?
Answers
Physical and chemical properties of each family different 'depend on valence electron'
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior and all the members of a family of elements have the same number of valence electrons and similar chemical properties and isotopes of an element have same number of electron as an atom of that element but they have different number of neutron which affect the mass number and mass number determine the physical properties while atomic number determine the chemical properties
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