Answer:
16.7 mL of 6.0 M HCl
Explanation:
Track runners will all cover the same distance. The winner will take:
A. more time than the other runners
B. less time than the other runners
C. the same time as the other runners
D. half as much time as the other runners
Answer:
option B. less time than the other runners
hope it helps you
Track runners will all cover the same distance. The winner will take less time than the other runners. Therefore, the correct option is option B.
What is distance?Despite the direction of something like the journey, distance is the overall path that an item in motion has traveled. Since just the length of the path travelled is calculated as well as the motion direction is ignored, distance is referred to as a scalar number.
Displacement is described as the overall alteration of an object's location and motion direction. Displacement is recognized as a vector quantity since it takes into consideration both the directions of the motion and the amount of the changing position. Track runners will all cover the same distance. The winner will take less time than the other runners.
Therefore, the correct option is option B.
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What is the empirical formula for a compound that is 94.1% oxygen and 5.90% hydrogen?
Answer:
H O
Explanation:
Here we are given that the percentage of ,
Oxygen = 94.10% Hydrogen = 5.90%And we need to find out the Empirical formula of the compound .
Firstly divide the given percentage by the atomic mass of the compound . Here this is followed in the fourth column of the table , which will give the relative number of atoms .Secondly , divide the value obtained by the smallest value among them .Say if we got the relative number of atoms as 4 , 3 and 2 , then divide all three numbers by 2 . ( follówed in 5th column below .)Finally write the Empirical formula of the compound by writing the ratio obtained as the subscript of respective compounds .Let's make a table ,
[tex]\boxed{\begin{array}{c|c|c|c|c} \underline{\bf Element} & \underline{\bf Percentage} & \underline{\bf Atomic \ Weight } &\underline{\bf No. \ of \ atoms_{relative} } &\underline{\bf Ratio } \\\\ \sf O & \sf 94.10 &\sf 16 &\sf \dfrac{94.10}{16}=5.88 &\sf \dfrac{5.88}{5.88}=1 \\\\\sf H &\sf 5.90 &\sf 1 &\sf \dfrac{5.90}{1}=5.90&\sf \dfrac{5.90}{5.88}\approx 1 \end{array}}[/tex]
Hence from this table we see that the ratio of oxygen and hydrogen is 1:1 . Therefore the Empirical formula of the compóund will be ,
[tex]\longrightarrow\underline{\boxed{\bf Empirical \ formula = H_1 O_1 = H \ O }}[/tex]
The empirical formula for the compound is OH
Data obtained from the question Oxygen (O) = 94.1%Hydrogen (H) = 5.90%Empirical formula =? How to determine the empirical formulaDivide by their molar mass
O = 94.1 / 16 = 5.88
H = 5.90 / 1 = 5.9
Divide by the smallest
O = 5.88 / 5.88 = 1
H = 5.9 / 5.88 = 1
Thus, the empirical formula for the compound is OH
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Give an example of a physical change in matter.
Answer:
Freezing or boiling water
Which phrase describes the energy of collision?(1 point)
A. heat that causes ice to melt when hot water is poured on it
B. force of molecules striking one another
C. energy passed from one object to another
D. kinetic energy transferred when billiard balls hit each other
yo yo yo
Explanation:
1. Force of molecules striking one another
2. the process of energy passing from one body to another
3. thermal
4. light
5. its energy is transferred to the other car.
The phrase that describes the energy of collision is D. kinetic energy transferred when billiard balls hit each other.
What is collision?collision can be regarded as coming together of one solid or direct impact to the other such as car collided with a tree.
Therefore, kinetic energy transferred when billiard balls hit each other is an example.
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how many molecules are in 2.0 moles of O2
Which of the following is the least precise way to measure a liquid?
A. graduated cylinder
B. pipette
C. buret
Answer:
B. pipette
Explanation:
A pipette can barely measure anything, they mostly don't have numbers on them and only squeeze out a few drops. Other materials, graduated cylinder and (buret) burette, have measuring lines on them. They can hold much more amount of liquid. This makes a pipette the least precise way to measure a liquid.
Can a metal detector detect copper, brass, and aluminum?.
Elevation can be described as elevation, relief, and landforms
O True
O False
??
Answer:
false Elevation cannot be described as elevation, relief, and landforms
Molar mass (easy but I’m lazy)
Answer:
dont be lazy
Explanation:
I didnt do cuz im lazy
:p
Describe how a chemical equation is written. Where are the reactants found? What about the products? What separates the two halves of the reaction?
Answer:
The reactants are listed on the left, and the products are listed on the right. They are separated by an arrow. The arrow can be read as yields, gives, or reacts to produce.
The symbol equation for combustion of a hydrocarbon is shown below. What number will go before the oxygen reactant when this equation is balanced?
Answer:
balance the equation
Explanation:
[tex]C_{3}H_{8} + 5O_{2} ->3CO_{2} + 4H_2O[/tex]
Calculate the mass of 4.95 x 10^15 Ag atoms
Answer:
8.87 × 10⁻⁷ grams
Explanation:
Moles = No. of Particles / 6.022 × 10²³ Particles/mol
Moles = 4.95 × 10¹⁵ atoms / 6.022 × 10²³ atoms/mol
Moles = 8.22 × 10⁻⁹ mol
Also,
Mass = Moles × M.Mass
Mass = 8.22 × 10⁻⁹ mol × 107.87 g/mol
Mass = 8.87 × 10⁻⁷ grams
How many grams of aluminum burned if 200.0 grams of aluminum oxide formed?
Answer:
approximately 106 grams
Explanation:
The molecular mass of Aluminum Oxide is approximately 102 grams per mole.
2
×
A
l
=
2
×
27
=
54
3
×
O
=
3
×
16
=
48
54
+
48
=
102
200
102
=
1.96
moles
There are two atoms of Aluminum in one mole and each atom has a mass of approximately 27 grams so
Mass of Al =
1.96
×
2
×
27
=
106
grams
What type of tree has thin, waxy needles that drop throughout the year and help to retain water?
palm trees
deciduous trees
coniferous trees
mixed trees
Only coniferous trees have thin, waxy, needle-like leaves that drop throughout the year and help to retain water.
What are coniferous trees?Coniferous trees are evergreen trees that produce cones.
In addition, they produce waxy and needle-like leaves that help them conserve water by limiting the evapotranspiration rate as a result of reduced surface area.
Examples of conifers include pine trees and spruces.
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Answer:coniferous trees
Explanation:
(a) What property is used today for the order of the elements?
(b) Which particle within the atom is responsible for this property?
Answer:
I feel as though you are missing information to this question.
Explanation:
elements on the periodic table, today, are arranged based on physical properties, such as valence electrons, atomic mass, etc.
Can tissue samples be deproteinized for measurement of NAPD/NADPH with 4%w/v sulfosalycilic acid?
A 4% w/v sulfosalycilic acid can be used in deproteinization of tissue samples for measurement of NAPD/NADPH.
What is deproteinization?Deproteinization is the process of removal of proteins from a tissue or cell sample.
Deproteinization is done to avoid interference by proteins when another biomolecule such DNA or NADP/NADPHis being assayed
Deproteinization can be done using certain chemicals such as sulfosalycilic acid.
A 4% w/v sulfosalycilic acid can be used in deproteinization of tissue samples for measurement of NAPD/NADPH.
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A compound contains 40 g of calcium, 12 g of carbon, and 48 g of oxygen. What is its empirical formula
Answer:
CaCO3
Explanation:
answer attached
hope this helps!
Select the correct terms to complete the statement:
The particles that make up a substance in its liquid state have ____ (less / more / the same) kinetic energy than those of the same substance in its solid state .
For a solid to melt, energy must be
energy must be ______
(added to / removed from) the system.
For a liquid to freeze, energy must be ____ (added to / removed from) the system.
Blank 1:
Blank 2:
Blank 3:
Answer:
The particles that make up a substance in its liquid state have more kinetic energy than those of the same substance in its solid-state.
For a solid to melt, energy must be added to the system.
For a liquid to freeze, energy must be removed from the system.
WILL GIVE BRAINLIEST!! if when electrolyzed water (2H2O->2H2+O2), the total bond energy of the reactants is 2000kJ and the total bond energy of the products is 934kJ what is the total energy of the reaction and is this an endothermic or exothermic reaction
Based on the data provided, the total energy of the reaction is 1066 kJ and the reaction is endothermic
What is the total energy of a reaction?The total energy change of a reaction is the difference between the total bond energy of the reactants and the total bond energy of the products.
If the total change in bond energy is positive, the reaction is endothermic.If the total change in bond energy is negative, the reaction is exothermic. The total energy change of a reaction = bond energy of reactants - bond energy of productsBond energy of reactants = 2000 kJ
Bond energy products = 934 kJ
Total energy of reaction = (2000 - 934) kJ = 1066 kJ
The total energy of the reaction is 1066 kJ and the reaction is endothermic.
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What is the percent of hydrogen by mass in CH4O?
(H:1.00 amu, C: 12.01 amu, O: 16.00 amu)
The mass percent of hydrogen in CH₄O is 12.5%.
What is the mass percent?Mass percent is the mass of the element divided by the mass of the compound or solute.
Step 1: Calculate the mass of the compound.mCH₄O = 1 mC + 4 mH + 1 mO = 1 (12.01 amu) + 4 (1.00 amu) + 1 (16.00 amu) = 32.01 amu
Step 2: Calculate the mass of hydrogen in the compound.mH in mCH₄O = 4 mH = 4 (1.00 amu) = 4.00 amu
Step 3: Calculate the mass percent of hydrogen in the compound.%H = (mH in mCH₄O / mCH₄O) × 100%
%H = 4.00 amu / 32.01 amu × 100% = 12.5%
The mass percent of hydrogen in CH₄O is 12.5%.
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A meteorologist gives the atmosphere pressure as 132.01 kPa. What is the atmospheric pressure in atm?
Use the conversion factor:
[tex]1\ atm=101.325\ kPa[/tex]
[tex]=132.01\ kPa[/tex] × [tex]\frac{1\ atm}{101.325\ kPa}[/tex]
= 1.302738712 atm (round as you wish)
How does increasing pressure affect the rate of reaction between gases?
A. It increases the rate of reaction because it increases the
equilibrium constant.
B. It increases the rate of reaction because it increases the number
of collisions.
C. It decreases the rate of reaction because it increases the number
of collisions.
D. It decreases the rate of reaction because it decreases the
equilibrium constant.
Answer:
B, increases rate of collisions
Explanation:
Calculate the molarity when 14.6 g Ethanol (C2H5OH) is dissolved in a 2.10 L solution
Someone please help!!!
Answer:
0.15 M
Explanation:
14.6/46.07g/mol = 0.316 mol Ethanol.
0.316/2.1= 0.15 M
A 22.2 g sample of MgCl2 is dissolved in water, creating a solution with a mole fraction of 0.0500 moles of MgCl2 per mole of solution. The molar mass of MgCl2 is 95.21 g/mol. How many total moles of solution were created?
This problem is providing both the mole fraction and mass of magnesium chloride in an aqueous solution. Thus, the total moles of the solution are required and turned out to be 4.62 moles.
Mole fractionIn chemistry, units of concentration are used to account for the relative amounts of solute and solvent in solid, liquid or even gaseous solutions.
Thus, several units are widely employed, yet this problem is about mole fraction, which relates the moles of the solute and the total moles of the solution as follows:
[tex]x=\frac{n_{solute}}{n_{total}}[/tex]
Hence, given the mass of the solute, calcium chloride, we can calculate its moles as follows:
[tex]n_{solute}=22.2g*\frac{1mol}{95.21g}=0.231mol[/tex]
Thereafter, we solve for the total moles of the solution and subsequently plug in the knowns:
[tex]n_{total}=\frac{n_{solute}}{x}\\\\n_{total}=\frac{0.231mol}{0.0500}\\\\n_{total}=4.62mol[/tex]
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19)
Why were collisions much more likely early in time (closer to the birth of the universe) than present day?
A)
galaxies were closer together
B)
galaxies were bigger in earlier times
C)
there were only spiral galaxies which tend to collide more often
D)
early galaxies had no more protogalactic clouds which formed more stars
to collide
Answer:
The answer is A.
Explanation:
Universe was smaller and galaxies were closer together in past, galaxy collisions were common in past (distorted galaxies were common in early universe).
The location of an element can provide information about its _______________. Select all that apply.
A. properties
B. valence electrons
C. category in the periodic table
Answer:
An element's location in the periodic table is largely dependent on its electrons; the number of valence shell electrons determines its group, and the type of orbital in which the valence electrons lie in determines the element's block.
A student wants to collect data during an experiment about the transfer of kinetic energy in a sample of water and ice. Which tool will help her collect the necessary data?
Given what we know, the tool in question that will help the student collect data regarding the transfer of kinetic energy between water and ice would be a thermometer.
How does the thermometer measure kinetic energy?It does not do so directly. However, kinetic energy in water molecules is reflected in the temperature of the water. When water molecules increase their kinetic energy and move more, they become hotter. Increased or decreased heat is an indirect way to measure the transfer of kinetic energy in water.
Therefore, given that the temperature of the water is a reflection of the transfer of kinetic energy happening, we can confirm that the tool that will help the student collect the data needed is a thermometer.
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Answer:
your answer will be a thermometer
Explanation:
if you go to connexus and are doing the science
Thermal Energy Unit Test 10 qestions 8th grd unit 5 test lesson 12 here are the correct answers
1. A. metal is heated from room temperature to 200'C.
2. B. The particles will have more space between them as steam, but they will be moving at the same speed in both states.
3. C. The potential energy decreases due to the tighter arrangement of the particles.
4. B. an increase in heat and an increase in kinetic energy until a phase change occurs.
5. C. thermometer
6. B. 4.
7. D. convection
8. C. Air moves from the areas of higher temperature to areas of lower temperature.
9. C. The temperature of the ice increases, while the temperature of the water decreases
10. A. heat transfer by radiation.
i hope this helps and please let me know if it does! = ) <3
Which element has the highest second ionization energy?.
Answer:
Li
Explanation:
Li has the highest IE2 , because to remove the second electron we must break the stable 1s2 noble gas shell.
Answer:
Li has the highest IE2 , because to remove the second electron we must break the stable 1s2 noble gas shell.
How is the formula of the ion with the -ate suffix, such as nitrate, related to the ion with the -ite
suffix, such as nitrite? How are their charges related?
Answer:
They depend on the ion?
Explanation:
If the wavelengths or light absorbed by hydrogen and helium are shifted toward the red end of the
spectrum, are those wavelengths becoming shorter or longer? Explain
Answer:
Wavelengths towards the red end of the spectrum has a longer wavelength
Explanation:
As seen by this diagram, we can tell that red has the longest wavelength than any other colour. Red has a lower frequency and so carries less energy.
Hope this helps!
