Answer:
The distance covered by the body per unit time is called speed.
A distance travelled by the body per unit time in a fixed direction is called velocity
I hope this help u:)
Answer:
Force is an external agency that changes or tends to change the state of a body from rest to motion or from motion to rest is called force
Explanation:
The distance covered by a body in a unit time is called speed
Which phrase correctly describes the molecular structure within a molecule?
Same molecular structure and same properties.
Molecular structure is three dimensional structure in which arrangement of atoms is placed.
The molecular structure of a compound determines the polarity and its reactivity.
The different states of matter solid, liquid and gas have different molecular structure and different properties from each other.
The molecular structure of a molecule will have same properties as of the entire molecule based on its state.
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Answer:
the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds
Why do.we need inactive ingredients?
Answer:
Inactive ingredients are components of a drug product that do not increase or affect the therapeutic action of the active ingredient, which is usually the active drug. Inactive ingredients are added during the manufacturing process of pharmaceutical products such as tablets, capsules, suppositories, and injections
5 (01.01 LC)
Which of the following would be a warning sign that information about a weight loss medication is not reliable science?
Answer:
The scientists and all test subjects involved in the investigation work for the company that sells the medication.
Explanation:
The options are as below:
A. The investigation compared a group that took the medication to a control group that did not take the medication.
B. The scientists and all test subjects involved in the investigation work for the company that sells the medication.
C. The weight loss medication worked for 95 out of the 100 test subjects, while only 15 of the 100 control subjects lost weight.
D. The weight loss results were replicated by scientists conducting a study at an independent institution
The correct option would be that the scientists and all test subjects involved in the investigation work for the company that sells the medication.
When selecting the test subjects for research, the selection must be as random as possible so as to ensure an unbiased outcome and increase the reliability of the research.
Limiting the test subjects to those that work in the company that sells the medication will generally reduce the reliability of the outcome because of element of bias that can be introduced either knowingly or unknowingly.
The test subjects must have been selected from the general population of target users for the medication and not limited to just the employees of the manufacturing company.
Correct option: B
[tex]\huge\mathfrak\red{QuEsTioN:-}[/tex]
How many neutrons are present in 4.4 gram of Co2
Explanation:
hope it will help you Mark me as a brilliant
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0.10 moles of sodium sulfate is dissolved into 12 mL of solution. What is the molar concentration of the solution?
Your answer should have two significant figures (round your answer to one decimal place).
the molar concentration should be atleast 5mL off the solution since its disolved
Answer:
8.3
Explanation:
Convert mL to L.
12 mL×1 L1000 mL=0.012 L
Solve for molarity.
Molarity=moles of solute
liters of solution=0.10 mol0.012 L=8.3 M
WILL GIVE BRAINLIEST, Which of the following would have the greatest amount of surface area?
A. 1 cubic foot of watermelons
B. 1 cubic foot of matchbox cars
C. 1 cubic foot of loose sand
D. A 1 cubic foot block of concrete
Answer:
C. 1 cubic foot of loose sand
Explanation:
For many objects having equal volume , surface area will be maximum
of the object which has spherical shape .
But when a sphere is broken into tiny small spheres , total surface area of all the small spheres will be more than surface area of big sphere .
Hence among the given option , surface area of loose sand will have greatest surface area . Loose sand is equivalent to small spheres .
Answer:
the answer would be C 1 cubic foot of loose sand.
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
- Molecules in both the metal and the surrounding air will start moving at lower speeds.
-Molecules in both the metal and the surrounding air will start moving at higher speeds.
-The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
-The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answer:
it will dilute to its natrual state. so c
Explanation:
The following water measurements were made: 18 mL of water were measured with a beaker, 128.7 mL of water were measured in a graduated cylinder and 23.45 mL of water were measured in a buret. All of these water samples were then poured together in one container. What total volume of water should be reported, when significant digits are taken into account?
Answer:
170 mL
Explanation:
The total volume to be reported should be 170 mL.
According to the significant rule in mathematical operations, final answers are usually reported to reflect the accuracy of the least accurate number.
In this case, the least accurate of all the volumes has zero significant digits after the decimal, hence, the final answer after the mathematical operation should also have no significant digits after the decimal.
18 + 128.7 + 23.45 = 170.15
Therefore, the total volume to be reported when significant digits are taken into account would be 170 mL.
What process is used to refine aluminum from its ore bauxite?
A. Electrolysis
B. Electrolytic oxidation
C. Voltaic cell processing
D. Smelting
The correct option for the process used to refine aluminum from its bauxite ore is option D.
D. Smelting
The reason why smelting is the correct choice is as follows;
Bauxite is the aluminum ore from which alumina, also known as aluminum
oxide, Al₂O₃, is produced. Bauxite is extracted from the topsoil regions of
some subtropical and tropical regions, and the Bayer process is primarily
then used to produce alumina from the bauxite.
Aluminum is produced from the alumina by an aluminum smelting process
known as the Hall—Heroult electrolytic process which involves the use of a
carbon anode and direct current to produce aluminum by reducing the
aluminum oxide
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Polymers formed from amino acids are called _____. proteins carbohydrates lipids nucleic acids
Answer:
Proteins
Explanation:
Amino acids act as monomers (a single unit used to form polymers) , the polymer will be a long chain of individual amino acids. An amino acid chain forms a protein. These proteins are also known as peptides.
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An atom has 36 protons, 36 electrons and a mass
number of 80. How many neutrons are in this atom?
Answer:
44 neutrons
Explanation:
To find the neutrons of an atom subtract the atomic number from the mass of the atom
in this case
80-36=44
tge number of neutrons that are in that atom is 48
A botanist measures a plant growth at 3cm over a two week period. The information she gathers is called.
Answer:
The correct answer is quantitative data.
Explanation:
The value of data in the form of numbers of counts where each set of data exhibits a specific numerical value associated with it is termed as quantitative data. This information refers to any quantifiable knowledge, which can be used for statistical analysis and mathematical calculations so that decisions of real-life can be taken based on the mathematical outcomes. The quantitative data is used to find the solutions of the queries like how often, how much, or how many.
In the given case, a botanist measured the growth of the plant for two weeks, and the outcome came in the form of numerical value. Thus, the knowledge she collected is known as quantitative data.
A turtle moves at a speed of 1.0km/h. How fast is the turtle moving in meter per second
Answer:
The speed of the turtle is 9.41 centimeters per second.
Explanation:
Speed of small turtle = 566 furlong/fortnight
1 furlong = 20,116.8 cm
1 fortnight = 1,209,600 seconds
Speed of small turtle in centimeter per seconds:
The speed of the turtle is 9.41 centimeters per second.
Explanation:
If you run a particular reaction, and in theory it was supposed to yield 50.0 grams of product, and the percent yield is 75%, how many grams did you actually end up with?
Answer:
37.5 grams
Explanation:
The percent yield shows how much of the reactant have been converted to product. The percent yield is the ratio of actual yield to theoretical yield multiplied by 100%. It is given by the formula:
%yield = Actual yield/ theoretical yield × 100%
Given that theoretical yield = 50 grams and the percent yield is 75%.
Using the formula and substituting:
75% = Actual yield/ 50 g × 100%
75% / 100% = Actual yield / 50 g
0.75 = Actual yield / 50 g
Actual yield = 0.75 × 50 g
Actual yield = 37.5 grams
Silica (also known as silicon dioxide) reacts with hydrofluoric acid to produce silicon tetrafluoride and water vapor.
a) Write the balanced chemical equation for the reaction
b) 12.5 g of silicon dioxide is reacted with a 24.6 g of hydrofluoric acid. What is the theoretical yield of water vapor?
c) If the actual yield of water vapor is 2.50 g, what is the percentage yield of the reaction?
The problem is solved by balancing the reaction equation as shown below. The stoichiometry of the reaction is now applied in solving the question.
The balanced reaction equation is:
SiO2 + 6HF → H2[SiF6] + 2H2O
Using stoichiometry
The amount of silicon dioxide reacted = 12.5 g/60.08 g/mol = 0.21 mole
1 mole SiO2 yields 2 moles of H2O
0.21 mole of SiO2 yields 0.21 * 2/1 = 0.42 moles of H2O
The amount of HF reacted = 24.6 g/20.01 g/mol = 1.23 moles of HF
6 moles of HF yield 2 mole of H2O
1.23 moles of HF yields 2 * 1.23/6 = 0.41 moles of H2O
Hence HF is the limiting reactant.
Theoretical yield of H2O = 0.41 moles of H2O * 18 g/mol = 7.38 g
The percentage yield of the water is = actual yield/theoretical yield * 100
Hence;
% yield = 2.50 g/7.38 g * 100 = 33.9%
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50. Carbon mono-oxide can be prepared by heating following substance with Conc. H2SO4. a. Oxalic acid b. Acetic acid c. Ethanoic acid d. All ic 252
A
Carbon monoxide gas can be prepared in lab by heating formic acid or oxalic acid with conc. H2SO4.
Procedure: Small amount of oxalic acid crystal is taken in a round- bottomed flask and all the apparatus are fitted as shown in figure. When conc. H2SO4 is poured in the flask through thistle funnel and heated then a mixture of CO and CO2 gas is formed. The mixture of gas is passed through a bottle containing NaOH solution where the CO2 gas is absorbed by NaOH.
2NaOH + CO2 → Na2CO3 + H2O
The pure CO gas is then collected in a gas jar by downward displacement of water.
which of the following flouride has the highest lattice energy a)NaF b)KF c)CsF d)LiF
Answer:
The correct option is;
d) LiF
Explanation:
The Lattice energy of ionic compounds can be calculated using the modified Coulomb's law as follows;
[tex]U = \dfrac{k' \cdot Q_1\cdot Q_2}{r_0}[/tex]
Where;
Q₁ and Q₂ = The ionic charges
k' = A constant depending on the ionic and valence configuration
r₀ = The distance between the two nucleus
Given the four compounds each of the metallic ions are of the same group (group one) have the same (only one) valence electron, and are combined to the same ion (fluoride ion) such that Q₂, is the same for all compounds, the factor that will influence the lattice energy more will be the r₀
The sizes of the atoms Li, Na, K and Cs increases as arranged as such Li has the least r₀, and therefore LiF the least lattice energy
From chemistry test online, we have;
The lattice energy of LiF = -1045 kJ/mole
The lattice energy of NaF = -924 kJ/mole
The lattice energy of KF = -822 kJ/mole
The lattice energy of CsF = -737 kJ/mole.
Which Nobel gas electron structures do the atoms in a
molecule of hydrogen chloride attain?
And can you tell me why aswell please?
Answer:
The noble as structures attained are helium and argon
Explanation:
The electron configuration of chlorine atom is 1s²2s²2p⁶3s²3p⁵
The elecron configuation of hydrogen is 1s¹
The electron configuration of argon atom is 1s²2s²2p⁶3s²3p⁶
The elecron configuation of helium gas is 1s²
Therefore, in the hydrogen chloride molecule the hydrogen and the chlorine each share one electron from the other atom to attain the the stable noble gas structure of helium for hydrogen and argon for chlorine.
5. What change would increase the amount of gas able to be dissolved in a given amount of liquid water? (2 points)
Increasing temperature
a
Increasing pressure
Increasing surface area
O
Increasing rate of stirring
answer : increasing pressure
the amount of gas that can be dissolved in liquid water increase with the increase in pressure
Answer:
increasing pressure
Explanation:
PLEASE PLEASE HELP!!!! What is the mass of a sample material that has a volume of 72.2cm³ and a density of 7.7g/cm³?
Answer:
The answer is
555.94g
Explanation:
To find the mass of a substance given it's density and volume we use the formula
[tex]Density \: = \frac{mass}{volume} [/tex]Making mass the subject we have
mass = Density × volume
From the question
Density = 7.7 g/cm³
Volume = 72.2 cm³
Substitute the values into the above formula
That's
mass = 7.7 g/cm³ × 72.2 cm³
We have the final answer as
mass = 555.94gHope this helps you
if 193 ml of chlorine gas was collected at 21 celsius, what volume would it have if the temperature dropped to 0 celsius
Answer:
New volume of chlorine gas (V2) = 179 ml (Approx)
Explanation:
Given:
Volume of chlorine gas (V1) = 193 ml
Temperature of chlorine gas (T1) = 21°C = 21 + 273 = 294 k
New temperature of chlorine gas (T2) = 0°C = 0 + 273 = 273 k
Find:
New volume of chlorine gas (V2) = ?
Computation:
Using charle's law
V1 / T1 = V2 / T2
193 / 294 = V2 / 273
V2 = 179.21
New volume of chlorine gas (V2) = 179 ml (Approx)
How would a decrease in volume affect the following reaction? N2 (g) + O2 (g) Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. 2NO(g) (1 point) The equilibrium would shift to the right. The equilibrium would shift to the left. There would be no change to equilibrium. The affect on equilibrium cannot be determined.
Answer:
Explanation:
N₂(g) + O₂(g) ⇄ 2NO( g )
We shall apply Le Chatelier's principle to see the effect of decrease in volume or increase in concentration on the effect of state of equilibrium in the reaction given .
In this reaction 1 volume of nitrogen gas reacts with 1 volume of oxygen to give 2 volume of NO gas . In total there is no change in volume due to reaction . So when we change the volume , the concentration of reactant and product will affect the rate of forward and reverse reaction . Overall there will be no change in the state of equilibrium . The equilibrium will neither shift to the right nor will shift to the left.
It will remain unchanged .
Di- Ethyl zinc is a chemical used in the library to protect books from worms, its composition is 53% Zinc, 38.9% Carbon, and 8.1% Hydrogen (At mass of Zn=65.4, C=12, H=1). Find the empirical formula of a compound
Answer:
ZnC4H10
Explanation:
The empirical formula of a compound refers to the formula that gives the simplest whole number ratio of each atoms of the elements in the compound.
The empirical formula is calculated thus:
The given percentages in the question represent the mass in grams of each element in the compound.
Zinc= 53%, C= 38.9%, H= 8.1% which represents 53g, 38.9g and 8.1g of each element respectively.
Molar Mass of Zn= 65.4 g/mol
Molar Mass of C= 12 g/mol
Molar Mass of H= 1 g/mol
Step 1: Divide the mass of each element by the molar mass given to convert to moles:
Zn= 53/65.4 = 0.81moles
C= 38.9/12 = 3.24moles
H= 8.1/1 = 8.1moles
Step 2: Divide each mole value by the smallest number of moles calculated, which is 0.81moles:
Zn= 0.81/0.81 = 1
C= 3.24/0.81 = 4
H= 8.1/0.81= 10
This is the mole ratio represented in the subscript of each element in the empirical formula:
That is, Zn (1) C (4) H (10)
Empirical formula= ZnC4H10
Questions
1 Explain why a solid expands when it is heated.
2 Explain how the liquid in a thermometer changes so that it can be used to
measure a temperature.
3 Use particle theory to explain why solids and liquids cannot be compressed
(squashed into a smaller volume).
4 Use particle theory to explain why liquids and gases can flow.
Answer:
answer of question 1 is
Explanation:
solids are denser than liquid and gases because solid particles are closely packed and do not have any empty spaces between their particels so when solid will heated its particles will spread and there will have more spaces between them so a solid expand on heating.
Question 4. Thanks !!
Answer:
the shape would be square planar.
Explanation:
From the question, we can see that the electron geometry is octahedral. Removing the two axial bonds to fit the description, and we have a square planar structure.
formula for finding speed using binding energy and mass
Answer:
The formula for finding speed using binding energy and mass is E=mc2.
what is a cubic unit cell ?
cubic unit cell is the smallest repeated unit which have all angles equal to 90 and all have edge lengths equal
It is the type of the Unit cell which is having all angles equal to 90 and all sides equal to each other
it's is a unit cell with cubic structure
Which of the following should NOT be used to hold chemicals while they are being heated?
Question 5 options:
test tube
weigh boat
beaker
crucible
Answer: Weigh boat
Explanation:
they are disposable and will likely melt
Weigh boat among the following should not be used to hold chemicals while they are being heated ,therefore option (b) is correct.
What do you mean by weigh boats ?Weigh boats are ideal for general-purpose weighing, evaporating, dispensing, and storing applications. Compatible with balances and dryers, these pans support precise measurements.
A weigh boat is an open container often used in chemistry and bio chemistry. It is used if you want to weigh a sample very accurately.
A weigh boat is an object that is used to protect your balance from any object you want to weigh.
Weigh boat among the following should not be used to hold chemicals while they are being heated ,hence option (b) is correct.
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How many moles of lithium are in 83 grams of lithium? pls answer :(
Explanation:
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Which of the following factors does not determine the movement of particles in the atoms or molecules of a gas according to the ideal gas law? (3 points) Select one: a. Pressure b. Temperature c. Volume d. Type of particles
Answer:
type of particles
Explanation:
Considering te definition of idela gas law, the correct answer is option C. type of particles is a factor that doesn't determine the movement of particles in the atoms or molecules of a gas according to the ideal gas law.
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
Finally, pressure, temperature and volume are factors that determine the movement of particles in the atoms or molecules of a gas according to the ideal gas law.
So, the correct answer is option C. type of particles is a factor that doesn't determine the movement of particles in the atoms or molecules of a gas according to the ideal gas law.
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