. Anthony proposed an experiment during which he would test the friction created when a skateboard is rolled along a flat surface. He selected three different surfaces (carpet, tile, and concrete) each with three different textures (dry, wet, and icy). His teacher told him that he would need to clarify his experiment before his project would be approved. Which of the following best describes why Anthony's project was rejected? A. Anthony's project has two independent variables. B. Anthony does not have a problem that can be tested. C. The skateboard will not be able to roll along the carpet. D. The friction created by a skateboard cannot be measured.
Answer:D
Explanation:I think
What is 100.000 divided multiplied by 60.90 - 3455 + 29180? Make it right please!
Answer: Thx brother!
Explanation: He let me have points!
Answer:
31815
Explanation:
did it on a calculator lol
A salute of hydrochloric acid has a molarity of 4.0m HCL. if a reaction requires 0.73 g of HCl what volume of the solution should be used?
Answer:
Explanation:
Molar weight of HCl is 36.46g/mole
The reaction requires 0.73 g of HCl so it requires
0.73/36.46 = 0.02 mole of HCl
Molarity of HCl is 4.0M = 4mole/liter
0.02/4 = 0.005L = 5mL
5 mL of HCl solution should be used.
Calculate the atomic mass of indium if inLithium-6 is 4% abundant and lithium-7 is 96% abundant.
Answer:
:)
Explanation:
You wish to make a 0.358 M hydroiodic acid solution from a stock solution of 3.00 M hydroiodic acid. How much concentrated acid must you add to obtain a total volume of 50.0 mL of the dilute solution?
Which of the following is a solution?
Salt water
Milk
Muddy water
Chlorine
Answer:
salt water
Explanation:
i learned from makeing slime
Answer:
C: Chlorine
Explanation:
The better we measure the better things ____
Don't look in the comments
Calculate the percentage of water in C2 H4O2.2H2O
Answer:
[tex]Molecular \: mass \: of \: C _{2}H _{4} O_{2}.2H_{2}O , \\ \\ ⇢ 12 \times 2 + 4 \times 1 + 16 \times 2 + 2(2 \times 1 + 16) \\ \\⇢ 24 + 4 + 32 + 36 \\ \\ ⇢ 96g[/tex]
[tex]\bold\pink{Percentage \: of \: substance \: in \: compound ,} \\ \\ \bold\pink{ ⇢ \frac{mass \: of \: substance}{mass \: of \: compound \times 100}}[/tex]
[tex]\%\:age \: of \: water \: (H_{2}O) = \frac{36}{96} \times 100 \\ \\ ⇢ 0.375 \: \times 100 \\ \\\fbox\red{\: ⇢ 37.5\%\:}[/tex]
hope helpful ~
Sort the properties of metalloids into the correct categories
brittle
Metallic Characteristics In-Between Characteristics
Nonmetallic
Characteristics
semiconducting
lustrous
solid at room temperature
amphoteric
metallic characteristics:
lustrous
solid at room temperature
in-between characteristics:
amphoteric
semiconducting
nonmetallic:
brittle
Explanation:
i took the instruction got then right :)
The metallic characteristics are lustrous, solid at room temperature
The in-between characteristics are amphoteric and semiconducting.
The nonmetallic characteristics is brittle.
What is metalloids?The elements whose properties are intermediate of metals and non-metals is called metalloid.
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If you had a bag with 200 atoms of Krypton in it, how many of them would be Krypton-83?
Answer:
23 atoms
Explanation:
Krypton (Kr) exists naturally as a mixture of six isotopes with atomic number of 36. These six isotopes occupy different percentages of the mixture. Below is a list of the isotopes and there percentage in a given mixture
1) Krypton-78 (⁷⁸Kr) ⇒ 0.35%
2) Krypton-80 (⁸⁰Kr) ⇒ 2.25%
3) Krypton-82 (⁸²Kr) ⇒ 11.6%
4) Krypton-83 (⁸³Kr) ⇒ 11.5%
5) Krypton-84 (⁸⁴Kr) ⇒ 57%
6) Krypton-86 (⁸⁶Kr) ⇒ 17.3%
To determine the amount of ⁸³Kr present in a mixture of 200 atoms of krypton, you will multiply the it's percentage of occurrence in nature by the amount of atoms in a given mixture
11.5/100 × 200 = 23 atoms
Hence, there should be 23 atoms of krypton-83 in the mixture of 200 atoms of Krypton.
. A room temperature white solid is mixed with a room temperature clear liquid resulting in a clear, colorless liquid that is hot to the touch. Has a chemical reaction occurred? Why or why not? (It may be possible to argue in favor of yes OR no. Defend YOUR answer.)
Yes, the chemical reaction occurs because new substance is formed and heat energy is released.
What is chemical reaction?Chemical reaction is a process in which one or more substances i.e. the reactants, are converted to one or more different substances i.e. the products so we can conclude that the chemical reaction occurs because new substance is formed and heat energy is released.
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Use the balanced equation to answer the question.
2 C2H6(g) + 5 O2(g) delta 4 CO(g) + 6 H2O(g)
How many moles of H2O are formed from 0.60 moles of C2H6?
Answer:
1.8 moles of H20
Explanation:
The balanced equation gives you the ratio of moles.
so you then have to say the number of moles of the substance you have multiplied by the the ratio of what you are looking for to what you have.
The ratio should be written in the form of a/b (fraction)
0.90 moles of H₂O are formed from 0.60 moles of C₂H₆.
From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and H₂O is 2:6. This means that for every 2 moles of C₂H₆ reacted, 6 moles of H₂O are formed.
Given that we have 0.60 moles of C₂H₆, we can use this ratio to calculate the corresponding moles of H₂O.
(0.60 moles C₂H₆) x (6 moles H₂O / 2 moles C₂H₆) = 1.80 moles H₂O
Therefore, 0.60 moles of C₂H₆ will produce 1.80 moles of H₂O according to the stoichiometry of the balanced equation.
However, it's worth noting that the given balanced equation doesn't match the stoichiometry usually seen for the combustion of ethane (C₂H₆). The typical balanced equation for the complete combustion of ethane is:
C₂H₆ + 7/2 O₂ -> 2 CO₂ + 3 H₂O
In this case, 0.60 moles of C₂H₆ would produce 0.90 moles of H₂O according to the stoichiometry of the balanced equation.
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_____ are most broadly defined as compounds that are electron-pair acceptors.
A: Bases
B: Acids
Answer:
Acids
Explanation:
i tested it and it is acids. hope this helps :)
15.05 ml of a KOH solution neutralizes 25.6 mL of a 5.0 M H2SO4 solution. What is the concentration of the KOH solution?
Answer:
The concentration of KOH solution is 17.009 moles/litre or 17.009M .
Explanation:
Here , the given reaction is -
[tex]2KOH +H_{2}SO_{4}$\rightarrow$K_{2}SO_{4}+2H_{2}O[/tex]
2moles of KOH requires 1mole for complete neutralisation.
Therefore ,
2 x number of moles of KOH = 1 x number of moles of [tex]H_{2}SO_{4}[/tex]
2 x (molarity of KOH x volume of KOH) = (Molarity of [tex]H_{2}SO_{4}[/tex] x volume of
[tex]H_{2}SO_{4}[/tex])
1 mole of [tex]OH^- $\rightarrow$[/tex] 1mole of [tex]H^+[/tex]
Molarity (KOH) = concentration (c)
volume (KOH) =15.05ML
Molarity ([tex]H_{2}SO_{4}[/tex] ) = 5.0 M
Volume of ( [tex]H_{2}SO_{4}[/tex] ) = 25.6ML
[tex]\frac{1\times(C \times15.05ml)}{OH^-} = \frac{(2\times 25.6 \times 5)}{H^+}[/tex]
C = [tex]\frac{0.2\times25.6\times5}{15.05}[/tex]
C= 17.009 moles/litre
Hence , the concentration of KOH solution is 17.009 M or moles/litre .
What is the molecular shape of a Cl2CO molecule?
A) Linear
B) Tetrahedral
C) Trigonal planar
D) Trigonal pyramidal
E) Bent
The molecular shape of a Cl₂CO molecule is (E) Bent. Option E
molecular shape of a Cl₂CO moleculeCl₂CO, which is also called carbonyl chloride or phosgene, is a molecule made up of one carbon atom (C), two chlorine atoms (Cl), and one oxygen atom (O) attached to the carbon atom. The Lewis structure of Cl₂CO shows that the oxygen atom has two sets of unshared electrons. This makes the molecule have a curved shape.
The reason why Cl₂CO has a bent shape is because the lone pairs on the oxygen atom push the bonded atoms away more than the shared pairs of electrons. Because of this, the two Cl atoms move closer to each other. This causes the bond angle to be less than 180 degrees and makes the molecule have a bent shape.
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Breyana and her friend found a piece of metal which they want to
identify.Here is what they figure out so far:
Mass of this metal is 37 g
Volume of this metal is 20 cm3
Answer:
The density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.
Explanation:
Given data:
Mass of metal = 37 g
Volume of metal = 20cm³
Which metal is this = ?
Solution:
We will solve this problem by using density formula. After finding density we will check from literature which metal has a density similar to our calculated density.
d = m/v
d = 37 g/ 20cm³
d = 1.85 g/cm³
The density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.
What is the matter can not be created or destroyed on changed from one form to another?
Silver chloride was reacted with magnesium hydroxide, in which magnesium displaced silver
ced the following reaction and state which one will form a precipitate.. (6mks)
Answer:
The precipitate is MgCl2Explanation:
The reaction that is described goes as follows:
2AgCl + Mg(OH)2 ---> MgCl2 + 2AgOH
The precipitate here is the MgCl2 salt.
I hope it helped!
Which of the following types of fingerprints is collected with gray or black powder and fingerprint tape?
fingerprints are collected with gray or black powder and fingerprint tape. These fingerprints are not visible to the naked eye.
Answer:
latent
Explanation: its latent.
Answer:
latent
Explanation:
Complete the balanced molecular reaction for the following weak acid with a strong base:HNO2(aq) + Ca(OH)2 (aq)
Answer:
[tex]2HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]
Explanation:
Hello.
In this case, considering that the reaction between nitrous acid and calcium hydroxide yield both water and calcium nitrite as a neutralization chemical reaction:
[tex]HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]
As it is not balanced due to the two nitrites at the right, we obtain:
[tex]2HNO_2(aq)+Ca(OH)_2(aq)\rightarrow H_2O(l)+Ca(NO_2)_2(aq)[/tex]
Which means that 2 before the nitrous acid balance both nitrogen and oxygen.
Regards.
________ are another name for the horizontal rows on the periodic table of
elements.
Answer:
I believe your answer would be Perio
Explanation:
Answer:
Periods :)
Explanation:
I dont know if thats what youre asking but thats what theyre called, there isnt another name
Is average atomic mass and atomic mass the same
Answer:
no
Explanation:
The key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.
Susan and her friend found a piece of metal which they want to
identify.Here is what they figure out so far:
Mass of this metal is 74 g
Volume of this metal is 40 cm3
Answer:
The given metal is beryllium.
Explanation:
Given data:
Mass of metal = 74 g
Volume of metal = 40 cm³
Which metal is this = ?
Solution:
First of all we will calculate the density.
it is mass divided by volume.
d = m/v
d = 74 g/40 cm³
d = 1.85 g/cm³
In literature it is given that the density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.
Which option is an element
Carbon dioxide
Air
Water
Carbon
Answer: Carbon is the only element listed. Carbon Dioxide consists of Carbon AND Oxygen x2 so this is a compound. As stated earlier, air is a mixture of compounds. Water is another compound consisting of Hydrogen x2 and Oxygen.
Explanation: pls give brainliest thanks!
An element is made up of atoms with the same atomic number.
Carbon is the only element listed.
What does element mean?Element, A substance that cannot be broken down chemically into simpler substances. An element is made up of atoms with the same atomic number, which means that each atom has the same number of protons in its nucleus as the other atoms in the element. water is a compound. The concept of water atoms does not exist. Water molecules are composed of hydrogen and oxygen atoms in the exact ratio of two hydrogens to one oxygen.air is a mixture rather than a compound: By fractional distillation of liquid air, air can be separated into its constituents such as oxygen and nitrogen.To learn more about : Element
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questions simplify
x+2x+3x
hello ; i don't understand your answer Explanation:
Answer:
[tex]\huge\boxed{\sf 6x}[/tex]
Explanation:
[tex]\sf x+ 2x + 3x\\\\Take\ x\ common\\\\x(1+2+3)\\\\x(6)\\\\\bold{6x}\\\\ \rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807How many moles in 4 g of Ca3N2?
.027 mol
.613 mol
2.05 mol
.760 mol
Answer:
0.027mole
Explanation:
If a student is titrating 10.0 mL of 1 M HNO3 with 1M NaOH and another students is titrating 10.0 mL of 1 M H2SO4 with 1 M NaOH, would they need the same volume of NaOH to reach the equivalence point? Explain your answer.
Given the two different titration reactions, the volume of NaOH required to reach the equivalence point of both reaction will be different.
Titration of HNO₃ and NaOHBalanced equation
HNO₃ + NaOH —> NaNO₃ + H₂O
From the balanced equation above,
The mole ratio of the acid, HNO₃ (nA) = 1The mole ratio of the base, NaOH (nB) = 1How to determine the volume of NaOHVolume of acid, HNO₃ (Va) = 10 mL Molarity of acid, HNO₃ (Ma) = 1 MMolarity of base, NaOH (Mb) = 1 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(1 × 10) / (1 × Vb) = 1
10 / Vb = 1
Cross multiply
1 × Vb = 10
Vb = 10 mL
Titration of H₂SO₄ and NaOHBalanced equation
H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2How to determine the volume of NaOHVolume of acid, H₂SO₄ (Va) = 10 mL Molarity of acid, H₂SO₄ (Ma) = 1 MMolarity of base, NaOH (Mb) = 1 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(1 × 10) / (1 × Vb) = 1/2
10 / Vb = 1/2
Cross multiply
1 × Vb = 10 × 2
Vb = 20 mL
Conclusion Titration of HNO₃ and NaOH required 10 mL of NaOH Titration of H₂SO₄ and NaOH required 20 mL of NaOHFrom the above calculations, we can conclude that different volume of NaOH will be required for the different reaction.
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Consider the reaction below. Which of the following would increase the partial pressure of B at equilibrium?
A (s) + B (g) ⇌ C (g) ΔH < 0
Answer Options:
A. adding A.
B. increasing the total volume of the container.
C. Increasing the temperature.
D. Removing C.
Answer:
Increasing the temperature
Partial pressure is the pressure exhibited by a single gas when present alone in a system. According to Le's principle, the partial pressure of B can be raised by increasing temperature. Thus, option C is correct.
What is Le's principle?
Le's principle states the shift in the position of the equilibrium when the reaction system is disturbed by some factors. The pressure, temperature, and concentration are the factors that affect the equilibria of the reaction mixture.
According to the ideal gas equation and Le's principle, the pressure of the system directly depends on the temperature. As the temperature of the system is raised the partial pressure of the reactant (B) will increase, and the reaction will move in the forward direction.
Therefore, the increase in the temperature increases the partial pressure of the gas.
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Can someone calculate the percentage of Hydrogen in NaOH?
Answer:
33%
Explanation:
Since there is only 1 particle for each element in the molecule, 100/ by 3 is 33.
please help me i’m in need!
Answer:
balanced............