Answers
Answer:
Stopwatch
Stopwatch is a time measuring tool.
Related Questions
What mass of sugar and water is needed to make 40 g of 10% solution?
Answers
10 g of sugar to 40g of water the solution becomes 50 g.
_________________________________________
= 10 / 50 * 100
= 20 %
_____________
Percentage of the sugar solute = Mass of solute / Mass of solution * 100
A high viscosity liquid will
Answers
Answer: high viscosity fluids move sluggishly and resist deformation.
Explanation: some examples of high viscosity liquids is Honey, syrup, motor oil, and other liquids that do not flow freely
How to get your crush to like you back
Answers
i’m just going to say this…
if people stop talking to you, or seeing you it’s for a reason. things don’t happen on accident, so if your crush stopped liking you then it was for a reason wether you realize it or not.
hope this helps!
Observe the following images. Which of them shows a chemical change happening?
I is rusting car, II is water boiling, III is cooking eggs and IV is melting ice cream
A. I
B. I and III
C. II and IIII
D. I, II, and III
Answers
Answer: B
Explanation:
I. Rusting is a chemical reaction which is oxidation of iron.
II. Boiling water is a physical change. There is no chemical change between H2O molecules. It only shifts to the gas state from the liquid state.
III. When egg is cooked proteins are denaturated so it changes interactions between molecules.
IV. Melting is also just a phase change like boiling.
A compound has a molar mass of 163.59 g/mol. If you have 736.155 grams of this compound, how many moles do you have?
Answers
Answer:
4.50000 moles
Explanation:
This is dimensional analysis. If there is 163.59 grams in 1 mole of this compound then the converse is true: in 1 mole of this compound there is 163.59 grams --> 1 mol/163.59 grams.
Now that you have your conversion factor:
736.155 grams * (1 mol/163.59 grams) is your equation.
When you multiply these together, grams cancel and you end up with the desired mole-based answer:
4.50000 moles (The extra zeros are to make up for the 6 significant figures in 736.155, feel free to omit them if necessary.)
(pls give brainliest if this helped)
Which sentence best describes what happens during a change of state from a solid to a liquid?
A. The temperature stays the same and the particle speed increases
B. The temperature increases and the particle speed stays constant.
C. The temperature decreases and the particle speed decreases.
D. The temperature stays the same and the particle speed stays constant.
Answers
Answer:
The temperature stays the same and the particle speed stays constant
which properties are affected by temperature?
Answers
Answer:
Please give Brainliest!
Explanation:
Material properties are dependent on the temperature. The tensile strength, yield strength and modules of elasticity decrease with increasing temperature. It should be expected that fatigue properties are also affected by the temperature.
A chemist dilutes a 1. 0 mL sample of 2. 0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0. 0080 M, what is its volume? Use M subscript i V subscript i equals M subscript f V subscript f. 125 mL 250 mL 500 mL 2,000 mL.
Answers
Answer:
We know the initial volume of the potassium nitrate solution is 1.0 mL and the initial concentration is 2.0 M, we also know that an unknown volume of water was added to the solution, which diluted our concentration down to a final value of 0.008 M. We are trying to find the final volume.
Here we can use this formula since the initial and final solutions are proportional. Before that let's define our variables.
[tex]M_1 = 2.0 M\\V_1 = \frac{1.0 mL}{1000} = 0.001 L\\M_2 = 0.008 M\\V_2 = \ ?[/tex]
[tex]M_{1}V_{1} =M_2 V_2\\[/tex]
[tex](2.0)(0.001) = (0.008)V_2\\\\\frac{(2.0)(0.001)}{0.008} = V_2\\\\V_2 = 0.25 L \ or \ (0.25 \ * \ 1000) = 250 \ mL[/tex]
Therefore you would have 0.25 L or 250 mL of your final solution.
Zn + 2HCl —> ZnCl2 + H2
If you have 6.8 moles of zinc chloride produced, how many moles of zinc reacted?
Answers
Answer:
about 4 or 4.8
Explanation:
Desperate Please Hurry
What was the evidence that Earth was round before there were photos from space?
Answers
Answer:
Explanation:
Are there any awnser choices?
if the atoms that share electrons have an unequal attraction for the electrons, the bond is called
Answers
Answer:
A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal. In a polar covalent bond, sometimes simply called a polar bond, the distribution of electrons around the molecule is no longer symmetrical.
Explanation:
All three types of rock form in which earth layer?
Answers
Answer:
Lithosphere
Explanation:
All three types of rock make up the Earth's lithosphere, the outermost layer. The lithosphere averages about 100 kilometers in thickness.
How can I increase the time over which the collision occurs?
Answers
Explanation:
The laws of physics determine that the force of impact increases with the square of the increase in speed. So, if you double the speed of a car, you increase its force of impact four times. If you triple the speed, the impact is nine times as great.Observe that the greater the time over which the collision occurs, the smaller the force acting upon the object. Thus, to minimize the effect of the force on an object involved in a collision, the time must be increased.
Identify the correct chemical name.
Select one:
a. calcium (II) hydroxide
b. chromium hydroxide
c. ammonium calcide
d. ammonium chloride
Answers
How does lemon juice stop an apple from turning brown?
Answers
The periodic table of the elements is a very useful organizational tool in science. What are some organizational tools you use in your daily life? How do they make your life easier
Answers
Answer:
There are several different types of tools you could encounter, including project management software, note-taking programs, journals, and day planners. Organization management tools help in sorting out one’s daily responsibilities and being more efficient with time: calendars, to-do lists, mind maps, document storage clouds.
Explanation:
what i know:) hope it helps
The Lewis dot model of an atom has seven dots. Which of the following is true about the atom?
A) it has seven energy levels.
B) it has one valance shell electron.
C) it requires one electron to complete it’s octet.
D) it requires seven other atoms to form a stable compound.
Answers
It requires one electron to complete its octet
The Lewis dot model of an atom has seven dots. The statement true about atom is,
It requires one electron to complete it’s octet.So, option C is correct one.
What is Lewis dot model?The simple representation of the valence shell electrons in a molecule.The Lewis structure is also known as Lewis dot formula, electron dot structure, Lewis dot structure, Lewis electron dot structure.It is used to show the arrangement of electrons around individual atoms in the molecule. In this representation valence electrons of atom is shows as dot or bonding electrons as a line between two atoms.What is valence electrons?The electron/electrons present in valence shell is called valence electrons. Each atoms require eight electrons to complete their octet or valence shell.
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In which of the following reactions is chlorine (Cl) oxidized? Br2 2Cl⒠→ Cl2 2Br⒠Cl2 2e⒠→ 2Cl⒠2ClO3⒠12H → Cl2 6H2O 2Na Cl2 → 2NaCl.
Answers
The reaction in which Cl has been oxidized is [tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]. Thus, option A is correct.
In a reaction, the oxidation has been defined as the loss of electrons by the atom, while reduction has been depicted as the gain of electrons.
The loss of electrons imparts a positive charge to the atom, while the gain of electrons imparts a negative charge to the atom.
In the following reactions, the Cl has been given as:
[tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]The chlorine has loses the electron and is converted to diatomic molecule. Thus, the Cl has been oxidized. The oxidation state of Cl has also been increased from -1 to 0.
[tex]\rm Cl_2\;+\;2\;e^-\;\rightarrow\;2\;Cl^-[/tex]The chlorine gains 2 electrons in the reaction and has been reduced.
[tex]\rm 2\;ClO_3^-\;+\;12\;H^+\;\rightarrow\;Cl_2\;+6\;H_2O[/tex]There has been no change in the oxidation state of chlorine. Thus, Cl has not been oxidized.
[tex]\rm 2\;Na\;+\;Cl_2\;\rightarrow\;2\;NaCl[/tex]The chlorine gains electron and has been converted to the Cl ion. With the gain of electrons, Cl has been reduced.
The reaction in which Cl has been oxidized is [tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]. Thus, option A is correct.
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which tool would be best for measuring centimeters
A. Metric ruler
B. Balance scale
C. Meter scale
D. Measuring tape
Answers
Answer:
the answer is d
Explanation:
mark brainleist
What is Jupiter’s strength of gravity?
Answers
Explanation: Jupiters surface gravity which is defined as the force of gravity at its cloud tops.
Consider the following system at equilibrium. CaCO3(s) Double headed arrow. Ca2 (aq) CO32â€""(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect? CCl4 CO2 CuSO4 Na2CO3.
Answers
The compound that has been capable to shift the equilibrium with common ion effect has been [tex]\rm \bold{Na_2CO_3}[/tex]. Thus, option D is correct.
The complete equation for the decomposition of calcium carbonate has been:
[tex]\rm CaCO_3\rightleftharpoons Ca^2^+\;+\;CO_3^2^-[/tex]
The equilibrium has been the state in the reaction, when the number of products and has been equivalent to the number of reactants. The increase or decrease in the concentration of any of the reactant or product results in the shift in the equilibrium.
For the given reaction, the addition of Calcium or carbonate ions to the solution results in the increase in the product concentration with the common ion effect, and thereby shifts the equilibrium condition.
The ions liberated by the following compounds has been:
[tex]\rm CCl_4\;=\text{not dissolved}\\CO_2\;+\;H_2O\leftrightharpoons CO_3^-\;+\;H^+\\CuSO_4\leftrightharpoons Cu^2^+\;+\;SO_4^2^-\\Na_2CO_3\leftrightharpoons 2\;Na^+\;+\;CO_3^-[/tex]
The compound, that has been capable of liberating the carbonate ions in the medium has been [tex]\rm \bold{Na_2CO_3}[/tex]. Thus, it results in the shift of the equilibrium due to common ion effect. Hence, option D is correct.
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Note the mass of copper(1) oxide formula unit 143.091 what is the mass of 8.250 moles of Cu2O
Answers
Answer:
The mass of 8.250 moles of Cu2O is 1180.5g
Explanation:
HOW TO CALCULATE MASS OF A SUBSTANCE:
The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass as follows:Mass (g) = no. of moles (mol) × molar mass (g/mol)
Molar mass of copper (I) oxide (Cu2O) = 63.5(2) + 16 = 143.09 g/molMass of Cu2O = 8.250 mol × 143.09 g/mol
Mass of Cu2O = 1180.5 g
Therefore, the mass of 8.250 moles of Cu2O is 1180.5 g.
Which is the correct definition of electronegativity?
Answers
Answer:
Electronegativity is defined as the tendency of an atom participating in a covalent bond to attract the bonding electrons
Explanation:
Electronegativity increases and you go up and to the right, making fluorine the most electronegative element.
The amount of energy needed to change a liquid to a solid is calculated using the enthalpy of ________ and has a __________ sign on the energy value.
Answers
As the ionic compound increases in
complexity, the melting point
A. increases
B. decreases
C. stays the same
Answers
Given what we know, we can confirm that as an ionic compound grows more complex, its melting point will increase.
What is an Ionic compound?An ionic compound is one in which atoms of elements share electrons between them to form compounds.These shared electrons generate powerful electrostatic forces that we refer to as ionic bonds. Electrostatic forces cause an increase in the melting point of a compound. As a compound grows more complex and adds more elements to its composition, it will gain new electrostatic forces, and thus increase its melting point.Therefore, as an ionic compound grows more complex, its melting point will increase due to the increasing number of strong electrostatic forces present in the compound.
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Answer: it INCREASES
if you don’t wanna read that long answer the other person put
Explanation:
Difference between Laboratory Thermometer and Clinical Thermometer.
Answers
Explanation:
Can you please mark me the brillantest?
The clinical thermometer can be titled while reading the temperature values whereas a laboratory thermometer needs to be kept upright.
what is the name of the compound whose formula is n,i,2o?
Answers
Answer:
Explanation:
Dinitrogen pentaoxide is a nitrogen oxide.
...
3.1Computed Properties.
Property Name Property Value Reference
Formal Charge 0 Computed by PubChem
give free 18 points again just answer yes or no
is einstein a scientist? yes or no
Answers
Answer:
yes
Explanation:
Answer:
Yes
Explanation:
Albert Einstein is often cited as one of the most influential scientists of the 20th century. His work continues to help astronomers study everything from gravitational waves to Mercury's orbit
In water is the mass of one molecule equal to the mass of one molecule in steam
Answers
Answer:
The mass of one mole of water molecule = 18 ×N
A amu
Explanation: The mass of one mole of water molecule = Mass of one molecule ×N A Also mass of one mole of water is its molar mass in grams. So the mass of one mole of water is 18 g
A sealed flask initially contains pure nitrogen dioxide gas (NO,). Over time, the nitrogen dioxide forms dinitrogen tetroxide gas (N,O.). The graph below shows the relative amounts of (NO,) and (N20.) over time. What is true about the time indicated by the blue arrow?
Answers
This problem is providing information about the equilibrium reaction whereby nitrogen dioxide gas produced dinitrogen tetroxide gas as shown on the attached picture and the following chemical equation:
NO₂ (g) ⇄ N₂O₄ (g)
In such a way, we can consider the given choices to reason the following: the blue arrow is pointing out the arrival to the equilibrium condition for the reaction, a point in which the rate of the forward reaction (formation of N₂O₄) is equal to the rate of the reverse reaction (formation of NO₂), because the molecules will fluctuate to the same relative amounts defined by the equilibrium constant.
Therefore the answer will be the first one on the attached file, which can vary on your online homework format.
It is important to note that the reactant is not used up at any point of the graph (concentration drops to 0) and also, the activation energy cannot be analyzed with this sparse information.
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