Answer:
Mass of product B = 15g
Explanation:
Reaction:
AB → A + B
Mass of AB = 25g
Mass of A = 10g
Unknown:
Mass of B = ?
Solution:
Based on the law of conservation of matter "matter is neither created nor destroyed but transformed from one form to another in a chemical reaction".
The amount of product = amount of reactant
Mass of AB = Mass of A + Mass of B
Now;
Mass of Product B = Mass of AB - Mass of A
Mass of product B = 25 - 10 = 15g
Mass of product B = 15g
if you perfom 30 joules of work lifting a 20-N box from the floor to a shelf how high is the shelf
Answer: 1.5 m
Explanation: E=mgh=Fh
30 J = 20 N * h
h = 30/20 = 1.5 m
Answer:
1.5 m
Explanation:
it just is its easy made A on test
What is the atomic mass for cl
Answer:
Chlorine's (Cl) atomic mass if 17.
Explanation:
"Chlorine (atomic number 17) is a yellowish-green toxic gas. About three quarters of all chlorine atoms have 18 neutrons, giving those atoms a mass number of 35. About one quarter of all chlorine atoms have 20 neutrons, giving those atoms a mass number of 37."
An object with a mass of 20.0 kg has a force of 5.0 Newton's applied to it. What is the resulting acceleration of the object?
Answer:
1/4
Explanation:
force/mass
5/20=1/4 abs
A box has dimensions: l = 10.0 cm; w = 5.0 cm; h = 2.5 cm determined by a mm ruler. Calculate
the volume of the box ± its absolute uncertainty.
Answer:
Volume of box = 125 cm³
Explanation:
Given:
Length l = 10 cm
Width b = 5 cm
Height h = 2.5 cm
Find:
Volume of box
Computation:
Volume of box = lbh
Volume of box = 10 x 5 x 2.5
Volume of box = 125 cm³
Objects that conduct electricity can easily carry an electrical charge. Which of the following materials best conducts electricity?
A. copper wire
B. plastic tubing
C. rubber sheets
D. cotton string
Answer:
copper wire!
Explanation:
Each copper atom has lost one electron and become a positive ion. ... The electrons can move freely through the metal. For this reason, they are known as free electrons. They are also known as conduction electrons, because they help copper to be a good conductor of heat and electricity. Copper, Silver, Aluminum, Gold, Steel and Brass are common conductors of electricity. When properly installed, it is the safest and most efficient metal to produce electricity. Copper is commonly used as an effective conductor in household appliances and in electrical equipment in general. Because of its low cost, most wires are copper-plated. For a material to be a good conductor, the electricity passed through it must be able to move the electrons; the more free electrons in a metal, the greater its conductivity.
in rutherford's gold foil experiment a very small number of alpha particles were deflected. what about the structure of the atoms that could have caused this?
Answer:The atom being mostly empty space. A small number of alpha particles were deflected by large angles (> 4°) as they passed through the foil. There is a concentration of positive charge in the atom. Like charges repel, so the positive alpha particles were being repelled by positive charge
Igneous intrusion D is younger than layers B, C, and E according to
Law of superposition
Law of cross-cutting relationships
Original horizontality
Uniformitarianism
Answer:
Law of cross-cutting relationships
Explanation:
This interpretation is based on the law of cross - cutting relationships.
This law states that "faults and fractures that cuts through a rock are younger than the rocks they cut through".
In a sequence of strata, the strata that are not cut through by these features are younger than the cross -cutting features. The igneous intrusion is younger since it cuts through the rock layers.What is a segment of DNA that can code for?
Answer:
gene
Explanation:
DNA is divided into functional units called genes. A gene is a segment of DNA that codes for a functional product (mRNA, tRNA, or rRNA). Since the vast majority of genes are transcribed into mRNA and mRNA is subsequently translated into polypeptides or proteins, most genes code for protein synthesis
Answer:
coding for protein are called exons, and the noncoding regions separating the exons are called introns. Following transcription, these coding sequences must be joined together before the mRNAs can function. The process of removal of the introns and subsequent rejoining of the exons is called RNA splicing.
Explanation:
1. What process occurs along transform fault plate boundary?
Answer:
hope it helps...
Explanation:
Along the third type of plate boundary, two plates move laterally and pass each other along giant fractures in Earth's crust. Transform faults are so named because they are linked to other types of plate boundaries. The majority of transform faults link the offset segments of oceanic ridges.
5. A sample of methane has a volume of 225 mL at 0.650 atm of pressure. What will the new volume be if the
pressure is increased to 1.25 atm?
Answer:
not sure
Explanation:
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer
The question is incomplete, the complete question is
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer? Ag^+ + 1 e^- rightarrow Ag Edegree = 0.7993 V V^2+ + 2e^- right arrow V E degree =-1.125 V Ag+ is reduced V is oxidized 1.924 V V2^+ is reduced Ag is oxidized I and II III, IV, and V I, II, and III III only IV and V
Answer:
only IV and V
Explanation:
If we look at the values of reduction potential for the two species, we will discover that vanadium has a negative reduction potential indicating its tendency towards oxidation.
On the other hand, solve has a positive reduction potential indicating a tendency towards reduction.
This implies that vanadium must be oxidized and silver reduced and not the not her way ground? Hence the answer above.
Which description best characterizes the motion of particles in a solid?
a. slow but able to move past one another
b. fast and widely spaced
c.not moving
d.vibrating around fixed positions
Answer:
Explanation:
Slow but able to move past one another
What is the frequency of a photon that has a wavelength of 754 um?
Answer:
0.39760273
Explanation:
I typed into calculator hope it's right.
When solving by using the Quadratic Formula, what are the steps to follow? a. factor, find values for a,b,c, subtract c. substitute into the formula, find values for a,b,c, simplify b. simplify, find values for a,b,c, factor d. find values for a,b,c, substitute into the formula, simplify
Answer:
D!
Explanation:
When solving by using the Quadratic Formula, The steps to follow are to find values for a, b, c, substitute them into the formula, and simplify. The correct option is d.
What are Quadratic Formulas?A quadratic equation is a mathematical equation that shows the equation in an arranged form in which the unknown variables are x and known variables are a, b, and c. Where a is not equal to 0.
The standard quadratic equation
ax² + bx + c = 0
To solve the quadratic equation, first, find the variable value, and substitute the value of a, b, and c. Simplify it and ans solve it and then get the solution. There is another thing in the quadratic equation, which is factorization.
Thus, the correct option is d. find values for a, b, c, substitute them into the formula, and simplify.
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How many moles of sodium chloride are present in 0.5 L of 4 Molar NaCl(aq)
Select one:
O a. 2 moles
O b. 3 moles
c. 8 moles
d. 0.25 moles
Answer:
the answer is c.
Explanation:
The number of moles of sodium chloride present in 0.5 L of 4 Molar NaCl(aq) is 2 moles. The correct option is a.
What are moles?Moles are the quantity or amount of any substance. It is a measurement quantity.
The concentration of NaCl is 4 molar
The volume of the solution is 0.5 L is given.
To calculate the number of moles, we use the formula of molarity, in which moles are divided by the volume of the given solution. The formula is:
Molarity = moles/ volume
4 M = moles / 0.5 L
Putting the values in the given formula:
Moles = 4 x 0.5 L = 2 moles
Thus, the correct option is a. 2 moles is the number of moles of sodium chloride.
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A chemistry student named Igor was performing a titration experiment. He used 500mL of 6M sulfuric acid, H2SO4(aq) to completely neutralize a 2.00 L solution of unknown concentration sodium hydrodixe, NaOH(aq). What is the concentration of the NaOH(aq) in molarity (M)?
Answer:
3 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
H2SO4 + 2NaOH —> Na2SO4 + 2H2O
From the balanced equation above, the following data were obtained:
Mole ratio of the acid, H2SO4 (nA) = 1
Mole ratio of the base, NaOH (nB) = 2
Next, the data obtained from the question. This include the following:
Volume of acid, H2SO4 (Va) = 500 mL
Molarity of acid, H2SO4 (Ma) = 6 M
Volume of base, NaOH (Vb) = 2 L
Molarity of base, NaOH (Mb) =?
Next, we shall convert 2 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
2 L = 2 L × 1000 mL /1 L
2 L = 2000 mL
Thus, 2 L is equivalent to 2000 mL.
Finally, we shall determine the molarity of the base, NaOH. This can be obtained as follow:
Volume of acid, H2SO4 (Va) = 500 mL
Molarity of acid, H2SO4 (Ma) = 6 M
Volume of base, NaOH (Vb) = 2000 mL
Mole ratio of the acid, H2SO4 (nA) = 1
Mole ratio of the base, NaOH (nB) = 2
Molarity of base, NaOH (Mb) =?
MaVa / M Vb = nA/nB
6 × 500 / Mb × 2000 = 1/2
3000 / Mb × 2000 = 1/2
Cross multiply
Mb × 2000 × 1 = 3000 × 2
Mb × 2000 = 6000
Divide both side by 2000
Mb = 6000 /2000
Mb = 3 M
Thus, the molarity of the base, NaOH is 3 M.
What does Le Châtelier's principle state?
How much of glucose (C6H1206) is needed to make 1 L of a 1-M solution? Use details to support your answer.
Answer:
200 g C₆H₁₂O₆
General Formulas and Concepts:
Chemistry - Solutions
Reading a Periodic TableUsing Dimensional AnalysisMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
1 M C₆H₁₂O₆
1 L of solution
Step 2: Identify Conversions
Molar Mass of C - 12.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar mass of C₆H₁₂O₆ - 6(12.01) + 12(1.01) + 6(16.00) = 180.18 g/mol
Step 3: Find moles of solute
1 M C₆H₁₂O₆ = x mol C₆H₁₂O₆ / 1 L
x = 1 mol C₆H₁₂O₆
Step 4: Convert
[tex]1 \ mol \ C_6H_{12}O_6(\frac{180.18 \ g \ C_6H_{12}O_6}{1 \ mol \ C_6H_{12}O_6} )[/tex] = 180.18 g C₆H₁₂O₆
Step 5: Check
We are given 1 sig figs. Follow sig fig rules and round.
180.18 g C₆H₁₂O₆ ≈ 200 g C₆H₁₂O₆
Consider the reaction below. Which species is(are) the Brønsted-Lowry acid(s)?
HF (aq) + NHâ (aq) â NHâ⺠(aq) + Fâ» (aq) g
Answer:
HF is the acid
Explanation:
The Brønsted-Lowry theory defines the acids and bases in chemistry as follows:
An acid is the species that can donate a proton
A base can accept protons.
In the reaction:
HF(aq) + NH₃(aq) → NH₄⁺(aq) + F⁻(aq)
As you can see, HF can donate its proton to produce F⁻: HF is the acid
In the same way, NH₃ is accepting a proton, NH₃ is the base.
What do you notice when you get into a car that has been sitting in the sun for a while?
Why is the inside of the car so hot?
How would things be different if the car’s windows were left open?
Answer:
I notice that it's extremely hot after it has been sitting in thr sun for a while. The sun's rays have been directly shining on the car because the car was in the sun's Ray's directly. If the car's windows were to be left open, it would be less hot but still be hot if the rays of the sun were directly on the car.
Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Energy due to the position of an object is called
A. potential energy
B. conditional energy
C. kinetic energy
D. nuclear energy
One method for separating polypeptides utilizes their different solubilities. The solubility of large polypeptides in water depends upon the relative polarity of their R groups, particularly the number of ionized groups. The more ionized groups there are, the more soluble the polypeptide. Which of each pair of the polypeptides that follow is more soluble at the indicated pH?
a. (Phe-Met)3 or (Glu)m at pH 7.0
b. (Lys-Ala)3 or(Gly)m at pH 7.0
c. (Ala-Ser-Gly)5 or (Asn-Ser-His)5 at pH 6.0
d. (Ala-Asp-Gly)5 or (Asn-Ser-His)5 at pH 3.0:
Answer:
The definition has been defined throughout the clarification segment below, as per the provided case.
Explanation:
Polypeptides were essential amino acids although therefore realize that those acids become charged individually, provide various R groups but have specific isoelectric positions as well.
The polypeptides could be divided by analysis of multiple isoelectric points including fulfilling the following, even though a protein always at the isoelectric point seems to have the end up losing money.
At pH 7, it would be very negatively (-) charged, although (Phe-Met)₃ is even less positive and therefore less reversible. This would be strongly positively (+) charge (equatorial) around pH 7, except for the amino as well as carboxyl-terminal, then (Gly)₂₀ which again is hourly rounding. Although the carboxylate categories of Asp compounds become partly protonated although neutral throughout (Ala-Asp-Gly)₅, around pH 3, although the imidazole categories of His compounds become completely protonated although covalently bonded throughout (Asn-Ser-His)₅.About pH 6.0, only certain polymers provide covalent bonds of polar Ser, however (Asn-Ser-His)₅ does have side bonds of polar Asn as well as partly protonated peptide bonds of His.A neutron has what kind of charge?
Answer:
Neutrons have no charge.
Explanation:
Remember it this way Neutral (neither of any side, in this case, + or +) and Neutron both have N. so Neutron is Neutral
When comparing the proper position for spotting different exercises, you can conclude that, in spotting any exercise, it is important to __________. A. stand with your feet together B. keep your hand on the bar C. keep your back upright D. Place your hand inside the lifter's hands Please select the best answer from the choices provided. A B C D
Answer:
The answer is B
Explanation:
I took the test. PS... if your taking this test in college you should know it. I'm taking this test in middle school and got a 100%
Exercising is an essential part of the body's daily rouging and hence its necessary to keep the position of the body straight when standing and spotting the exercises.
The person should adopt the proper mechanism of exercising and a proper formal way of doing it. They should focus on posture when standing and sitting.Hence the option C is correct.
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⦁ Which of the following has the greatest Fe content: FeS, Fe2(SO4)3, or FeCl2? Complete calculations must be shown to support your choice. (
Answer:
Fe2(SO4)3 has the greater iron content.
Explanation:
Hello!
In this case, considering the content of a specific element in a compound, we must take into account the subscript is has in the formula, for instance FeS has one iron atom, Fe2(SO4)3 has two iron atoms and FeCl2 has one iron atom; thus, by assuming one mole of each compound, we can compute the moles of iron there:
[tex]n_{Fe}^{FeS}=1molFeS*\frac{1molFe}{1molFeS}=1molFe \\\\n_{Fe}^{Fe_2(SO_4)_3}=1molFe_2(SO_4)_3*\frac{2molFe}{1molFe_2(SO_4)_3}=2molFe\\\\n_{Fe}^{FeCl_2}=1molFeCl_2*\frac{1molFe}{1molFeCl_2}=1molFe[/tex]
It means that Fe2(SO4)3 would have the greatest iron content.
Best regards!
Round each number to two significant figures. 0.002353
Answer:
0.0024
Explanation:
you dont count the zeros as significant factors then round up 3 to 4 because you always round up if its 5 dont worry about the other numbers you dont need them hope it helped
2) The respiratory and digestive system work together to help the body
function efficiently. What is ONE way in which the two body systems
work together?
A)
The respiratory and digestive systems work together
to provide nutrients to tissues.
B)
The respiratory and digestive systems work together
to rid the body of carbon dioxide.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
The respiratory and digestive systems work together
to make enzymes for the breakdown of nutrients,
D)
A is the correct answer
Answer:
The correct option is C.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
Explanation:
DIGESTIVE SYSTEM is the System the body that help to breakdown compound molecules into smaller pieces that can easily by absorbed by the body hence release nutrients and ATP. Energy are stored as glucose and resuable as ATP.
RESPIRATION is a process whereby oxygen is inhaled and it help to breakdown large compounds to release energy (ATP) and carbon dioxide is released. Both system work together to release ATP for cells.
Therefore , The respiratory and digestive systems work together
to make usable ATP energy for cells. Is the correct option.
What is the predominant intermolecular force in the liquid state of each of these compounds: hydrogen fluoride (HF), carbon tetrabromide (CBr4), and nitrogen trifluoride (NF3)? Force(s): Dipole-dipole Hydrogen Bonding Dispersion
Answer:
HF - hydrogen bonding
CBr4 - Dispersion
NF3 - Dipole-dipole
Explanation:
Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom such as fluorine, chlorine nitrogen, oxygen etc. Hence the dominant intermolecular force in HF is hydrogen bonding.
CBr4 is nonpolar because the molecule is tetrahedral and the individual C-Br dipole moments cancel out leaving the molecule with a zero dipole moment hence the dominant intermolecular force are the dispersion forces.
NF3 has a resultant dipole moment hence the molecules are held together by dipole-dipole interaction.
The predominant intermolecular force in the liquid state of the compounds are as follows:
HF - hydrogen bondingHF - hydrogen bondingCBr4 - DispersionHF - hydrogen bondingCBr4 - DispersionNF3 - Dipole-dipoleDiscussion:
Hydrogen bonding is a bonding characterized covalent bonding of hydrogen to a highly electronegative atom such as fluorine, chlorine nitrogen, oxygen etc.In essence, the dominant intermolecular force in HF is hydrogen bonding.
Carbon tetrabromide, CBr4 is nonpolar because the molecule is tetrahedral and the individual C-Br dipole moments neutralise leaving the molecule with a zero dipole moment hence the dominant intermolecular force are the dispersion forces.Nitrogen trifluoride, NF3 has its molecules held together by dipole-dipole interaction as a result of its resultant dipole moment.Read more:
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What is the current in a 160V circuit if the resistance is 5Ω?
Answer:
use v=IR
Explanation:
so, 160=I*5
I = 160/5
=32 ampere
The current = 32 A
Further explanationElectric current is a ratio between the voltage and the amount of resistance at the conductor.
Can be formulated
[tex]\large{\boxed{\bold{I=\frac{V}{R}}}[/tex]
V = Voltage (volts)
R = resistance (ohms)
This formula is also known as Ohm's Law, which states that
the amount of current flowing is directly proportional to the voltage and inversely proportional to the resistance.
V=160 V
R=5Ω
[tex]\tt I=\dfrac{160}{5}=32~A[/tex]