The speed of the particles rises with the temperature of the solid, liquid, or gas. The particles slow down with decreasing temperature.
A liquid can turn into a solid if it is cooled down far enough.
Why does a liquid become a solid when its temperature drops?The average kinetic energy of the molecules falls as a liquid cools.
The liquid eventually turns into a solid when the quantity of heat removed is sufficient to cause the molecules to be attracted to one another.
Freezing is the process of transitioning from a liquid to a solid.
It loses thermal energy when the liquid cools. Its constituent particles therefore decelerate down and converge.
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Drag the number to the correct location based on the number of significant figures.
Significant figures
0.0093: Leading zeros are never significant. This number has two significant figures, nine and three.
120.9: Nonzero numbers are significant and zeros between those numbers are significant, too. This number has four significant figures.
1.000: Trailing zeros are significant if there is a decimal point. This number has four significant figures.
1.008: Nonzero numbers are significant and zeros between those numbers are significant, too. This number has four significant figures.
670: Trailing zeros are not significant. This number does not have a decimal point. So, it has two significant figures.
0.184: Nonzero numbers are significant. This number has three significant figures.
1.30: Trailing zeros are significant if there is a decimal point. This number has three significant figures.
The empirical formula for a compound that contains 89.3% potassium and 10.7% nitrogen is:A)K2NB)KNC)K3ND)KN3
Explanations:
1. Calculate number of moles for K and N(i) Moles for K
mass = 89.3% = 89.3g
Mol. mass K =39.0983g/mol
∴ n = mass/molmass
=89.3/39.0988
=2.28 moles
(ii) Moles for N
mass = 10.7% = 10.7 g
Mol. mass N =14.0067g/mol
∴ n = mass/molmass
=10.7g/ 14.0067g/mol
=0.76 moles
2. Divide all components by the smallest value:• K= 2.28 /0.76 = 2.9898240669737 ≈ 3
• N=0.76/0.76 = 1
Therefore emperical formula has 3 K and 1 N = K3NWhat does a scientist mean when he or she says an object is at rest?(1 point) Responses The object is not speeding up or slowing down. The object is not speeding up or slowing down.
The object has no forces acting on it.
The object has no forces acting
on it. The object has no attractive forces acting on it. The object has no attractive forces acting on it. The object is not moving relative to its surroundings.
Scientist mean when he or she says an object is at rest then the object is not moving relative to its surroundings
Velocity of the object is said to be uniform when its speed and direction does not change and the object at rest has uniform speed of zero all the time and does not even change the direction and when object is at rest position then the velocity is zero such an object will not change its state of motion that's why when he or she says an object is at rest the scientist says that the object is not moving relative to its surroundings
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is making glass wool a physical or chemical change?
Hi everyone,
The General formula for relative abundance
First 1:
Copper is made up of two isotopes.
Cu-63(62.9296 amu)
Cu-65(64.9278 amu)
Giving copper atomic weight of 63.546. What is the percentage abundance of each isotope?
Copper is made up of two isotopes ⁶³Cu(62.9296 amu) ⁶⁵Cu(64.9278 amu) Giving copper atomic weight of 63.546 then the percentage abundance of each isotope ⁶³Cu = 70% and ⁶⁵Cu = 30.848%
Isotopes are the members of a family of elements that all have the same number of protons and different numbers of neutrons
Here given data is
⁶³Cu = 62.9296 amu
⁶⁵Cu = 64.9278 amu
atomic weight = 63.546
We have to calculate percentage abundance of each isotope = ?
Let the natural abundance of ⁶³Cu is x
The natural abundance of ⁶⁵Cu 100−x
atomic weight is 63.546
Then 100×63.546 = 63x + 65(100−x)
= 6354.6 = 63x + 6500−65x = 6500−2x
= 2x = 145.4
= x = 72.7≃70
Hence the natural abundance of ⁶³Cu is is 70%
Therefore for ⁶⁵Cu the calculation the also same and ⁶⁵Cu = 30.848%
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Help pls I have 5 min pls
How many electrons does hydrogen need in order to have a full shell of valence electrons?(1 point).
The number of electrons that hydrogen needs in order to have a full shell of valence electrons are one valence electron.
What are valence shell electrons?Valence shell electrons refer to the electrons that are found in the outermost shell of atoms of elements.
Valence electrons are the electrons that are involved in the chemical reactions of atoms of elements.
Atoms of elements take part in chemical reactions in order to achieve an octet or duplet structure which confers stability to the atoms.
Duplet refers to two complete valence electrons while octet refers to eight complete valence electrons.
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THIS IS I NEED HELP FAST
Answer: Quadrant 1: (1/3, 2 1/3)
Quadrant 2: (-1 1/3, 3 1/3)
Quadrant 3: (-3, -10), (-3 1/3, -1 1/3)
Quadrant 4: (9, -1), (1 1/3, -1 1/3)
Explanation:
Graph these coordinates on an XY plane to visualize which quadrant they land in.
Look at the data in Figure 1. Fresh water has a salinity close to 0%. What is the surface tension for fresh water?
Answer: It appears as though fresh water has a surface tension of 72.5 mN/m
Explanation: Since fresh water does not have a high concentration of salt, and pure fresh water has no salt at all, you are trying to find the value of surface tension at 0% salinity. At 0% salinity, the surface tension value is 72.5 mN/m
When the ph of a solution decreases from 4. 0 to 2. 0, how does the concentration of h3o+ change?.
Hydronium ion concentration increases by 100 fold on decreasing the pH of solution from 4 to 2.
In order to compute pH, the log of the hydronium ion concentration was used.
pH = -log [Hydronium ion concentration]
So, at pH 2.0 number of hydronium ions are 10^-2
And at pH 4.0 number of hydronium ions are 10^-4
By decreasing pH there will be 100 times more hydronium ions.
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Which of the following is an empirical formula?A.) P4O10B.) C2H4C.) H2O2D.) N2O
Answer:
N2O is an empirical formula
Explanation:
A.) P4O10 NO: Can be reduced to P2O5
B.) C2H4 NO: Can be reduced to CH2
C.) H2O2 NO: Can be reduced to H O
D.) N2O YES, the formula cannot be reduced any further.
PLEASE HELP 50 POINTS. PLEASE !!! BALANCING CHEMICAL EQUATIONS
Answer: 1st one is 1 N2 + 3 H2 > 2 NH3
2nd one is 2 KCLO3 > 2 KCL+3 O2
3rd one is 2 NaCL + 1 F2 > 2 NaF+CL2
> are the arrows
The numbers in front of the other numbers are the coefficient.
The numbers behind the numbers are the exponents.
If x = − 4, which number line shows the value of |x|? (5 points) Group of answer choices
If x = − 4, number line shows the value of |x| is 4 tick mark to the left of zero.
given that :
x = -4
The absolute value is the distance from zero. The absolute value is always positive.
| x | = | -4 | = 4
The absolute value = distance from the zero.
a number line contains negative and positive number . number to the right side of zero is positive and to the left side of zero is negative. Absolute value means how far the number is from zero.
Thus, If x = − 4, number line shows the value of |x| is 4 tick mark to the left of zero.
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(Multiple choice) Of the following species, which is most likely to be oxidized?
An element that is oxidized is one that loses electrons, losing electrons increases its oxidation state. Now, the more electrons there are in the last energy level of the element, that is, valence electrons, the easier it will be for this element to lose them. We can identify valence electrons in the periodic table, the group to which the element belongs indicates how many valence electrons it has. Let's see what the oxidation state of the elements is:
F:7
Li:1
N:5
Be:2
O:6
We see that Lithium is the one with the fewest valence electrons, it has only one valence electron, so this will be the element that is most likely to be oxidized.
Answer: 2. Li
1.40 L solution was made by mixing 69.3 mL of dioxane, Which has a density of 1.03 g/mL, and 1.3 L of Toluene, Which has a density of 0.87 g/mL. Calculate the volume percent of dioxane in the solution. Be sure your answer has the right number of significant digits.? %(v/v)
To calculate the volume percent of dioxane we will apply the following formula:
[tex]Volumepercent=\frac{\text{Volume of solute}}{Volume\text{ of solution}}\times100[/tex]In this case, the solute will be dioxane, and the volume will be 69.3 mL.
To calculate the volume of solution we will sum both volumes:
Volume of solution = Volume of dioxane + Volume of Toluene
Volume of solution = 69.3 mL + 1300 mL
Volume of solution = 1369.3 mL
[tex]Volumepercent=\frac{\text{6}9.3\text{ mL}}{1369.3\text{ mL}}\times100\text{ = 5.1}[/tex]We are given all the data with a significant digit, therefore we must report the result also with a significant digit. So the answer will be.
The volume percent of dioxane in the solution is 5.1 %(v/v)
Which set
correctly orders
the atoms from
lowest to highest
ionization
energy?
PLEASE HELP
Answer:
Pb, Sn, Te, S, Cl
Explanation:
Is a salt obtained as a reaction between a base and an acid?
To answer if a salt is formed between the reaction of a base and an acid, we need to remember that, if we react a strong acid and a strong base, such as HCl and NaOH, two products will be formed: the appropriate salt and water.
In the example above, we can write the reaction as:
HCl + NaOH -> NaCl + H2O
where a strong acid and a strong base react to form a salt (NaCl) and water (H2O).
Thus, we can say that, yes, a salt is formed when an acid and a base react between each other.
PLEAE HELP SCIECE I WILL GIVE YOU BRAINLIEST
Answer:
You have to record it before
Match the definitions to the atomic models. Model names may be used more than once.
Question 3 options:
Supported by Rutherford's gold foil experiment
A small, dense, positively-charged nucleus surrounded by a negatively-charged electron cloud.
The atom has a small positively-charged nucleus with negatively-charged electrons orbiting in different energy levels.
This is the current model of atomic structure which explains the existence of electron clouds and their discrete energy levels.
Sometimes referred to as the Planetary Model
Was disproved by Rutherford's gold foil experiment
Negatively-charged electrons randomly dispersed in a sea of positive charge.
1.
Plum Pudding Model
2.
Bohr Model
3.
Quantum Mechanical Model
4.
Nuclear Model
Nuclear Model - Supported by Rutherford's gold foil experiment.
Nuclear Model - A small, dense, positively-charged nucleus surrounded by a negatively-charged electron cloud.
Quantum Mechanical Model - This is the current model of atomic structure which explains the existence of electron clouds and their discrete energy levels.
Plum Pudding Model - Was disproved by Rutherford's gold foil experiment.
Plum Pudding Model - Negatively-charged electrons randomly dispersed in a sea of positive charge.
Bohr Model - Sometimes referred to as the Planetary Model.
Bohr Model - The atom has a small positively-charged nucleus with negatively-charged electrons orbiting in different energy levels.
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The bond formed between two nonmetals, which are usually very similar in their tendency to lose or gain electrons, is the _____ bond. This bond involves the _____ of one or more electron pairs between the two atoms.
The bond formed between two nonmetals, which are usually very similar in their tendency to lose or gain electrons, is the covalent bond. This bond involves the sharing of one or more electron pairs between the two atoms.
What is covalent bond?
A covalent bond is produced by the equal sharing of electrons from both participating atoms. This sort of bonding involves a shared pair or bonding pair of electrons. The sharing of bonding pairs will ensure that the atoms reach stability in their outer shell, analogous to the atoms of noble gases.
Elements with very high ionisation energies are incapable of transmitting electrons, while elements with very low electron affinity are incapable of absorbing electrons.
Atoms of such elements tend to share electrons with atoms of other elements or atoms of the same element in such a way that both atoms achieve octet configuration in their respective valence shells and thus achieve stability. Covalent Bond refers to such a link formed by the sharing of electron pairs among distinct or similar kinds.
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If 7.34 mol of O2 reacts, calculate the grams of CO2 produced.CH4 + 2O2—> CO2 + 2H2O
Answer:
[tex]161.48\text{ g}[/tex]Explanation:
Here, we want to get the mass of carbon (iv) oxide produced
From the question, we have the balanced chemical reaction stating that 2 moles of oxygen molecule produced 1 mole of carbon (iv) oxide molecule
The number of moles of carbon (iv) oxide produced from 7.34 mol oxygen is thus:
[tex]\frac{7.34\times1}{2}\text{ = 3.67 moles}[/tex]1 mole of carbon (iv) oxide contains 44 g
The mass in 3.67 moles will be:
[tex]44\times3.67\text{= 161.48 g}[/tex]What is the electron configuration of Silicon in Ground state ?
A) 1s22s22p63s23p14s1
B) 1s22s22p63s4
C) 1s22s22p63s23p2
D) 1s22s22p63s23p3
Decompositionof ammonium nitrate produces water and di nitrogen oxide. a) Predict how many grams of water will be produced from decomposition of 0.555 kg of ammonium nitrate.b) If 120. g of water is actually produced, what is the percent yield for this reaction
NH4NO3(s) ==> 2 H2O(g) + N2O (g) (balanced)
a) We need the molar masses for each compound:
NH4NO3 = 80.0 g/mol (ammonium nitrate)
H2O = 18 g/mol (water)
0.555 kg => 1 kg = 1000 g => 0.555 kg = 555 g
80.0 g NH4NO3 -------- 2 x 18 g H2O
555 g NH4NO3 -------- X = 250 g
Answer a): 250 g water
b) % yield of water
120. g of water = actual yield
250 g of water from a) is the theoretical yield
Therefore, the % yield:
% yield = (actual yield/ theoretical yield) x 100
% yield = 120. g water/250 g water x 100
% yield = 48 %
Answer b): % yield = 48 %
I onlyI and II onlyII onlyII and III onlyI and III onlyIII only
The species that act as acid are the ones that donates H⁺ in the reaction.
Since we are working with an equilibrium, we have to consider both directions.
From left to right, we have H₂O turning into OH⁻ because it lost one H⁺, so H₂O is acting as an acid in the forward reaction.
From right to left, we have CH₃NH₃⁺ tunrning into CH₃NH₂ because it lost one H⁺, so CH₃NH₃⁺ is acting as an acid in the backwards reaction.
So, the species that act as acids are H₂O and CH₃NH₃⁺, I and II only.
classify the following as a heterogeneous mixture (suspension), homogeneous mixture (solution), or colloid: hot tea with lemon
Hot tea with lemon is classified as a homogeneous mixture as once the two components are mixed they maintain uniform composition through out the mixture.
The mixtures can be classified broadly into 3 types:
(on the basis of composition)
homogeneous
heterogeneous
colloids
Homogenous mixtures are those mixtures in which the composition of the mixture is uniform throughout the mixture.
Hetrogenous mixtures reffer to those mixtures where the composition of does not remain uniform through out the mixtures. These can consists two or more compounds in differet phases.
A colloid is a mixture of particles that are too big when compared to the atom but still are invisible to the direct eye. The particles present in a colloidal mixture range from 1 to 1000 nanometers in diameter
Hot tea with lemon is classified as a homogeneous mixture as once the two components are mixed they maintain uniform composition throughout the mixture.
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• What happens to matter during chemical reactions Are the atoms the same or different before and after the reaction?
Answer:
only the atoms present in the reactants can end up in the products.
Explanation:
In each sentence, choose the number that represents the correct answer. A. Under certain conditions, 6 units of hydrogen will burn in 1 second. This process releases energy at a rate of 286/572/1,716 kJ per second. B. Under the same conditions, 1 unit of ethanol will burn in 1 second. This process releases energy at a rate of 686 /1,371/8,226 kJ per second. C. Under these conditions, hydrogen / ethanol will release more energy in 1 second.
C. Under these conditions, hydrogen / ethanol will release more energy in 1 second is the correct answer.
The energy change that occurs when one mole of a compound is burnt in excess oxygen under standard conditions is called the standard enthalpy change of combustion. The standard enthalpy change of combustion of hydrogen is -286kJ/moL.Ethanol combustion is an exothermic process. The chemical reaction that occurs when ethanol burns releases a lot of heat and energy, 277.7 kJ per mole of ethanol, in addition to the creation of new compounds. In conclusion, ethanol burns by combining with oxygen to create carbon dioxide, water, and heat.The standard enthalpy change of combustion is the energy change that happens when one mole of a compound burns in excess oxygen under typical conditions. Enthalpy change for hydrogen combustion is typically -286kJ/moL.To know more about Hydrogen check the below link:
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What is the isotope name of the element that has 9 neutrons?
1)Beryllium-4
2 ) Beryllium-9
3) Fluorine-9
4) Fluorine-19
5)Not enough information to tell
We do not have enough information to deduce the isotope that would have nine neutrons. Option 5
What is the neutron?The atom is composed of subatomic particles. The subatomic particles that are in the atom are such that we have the electrons that are negatively charged, the protons that are positively charged and the neutrons that are uncharged.
Now, we know that the number of neutrons is obtained as the difference between the mass number and the atomic number of the atom. In this case, we only have the mass numbers and not the atomic numbers thus we do not have sufficient information.
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Energy and Temperature Activity Worksheet
Instructions: Follow the directions below to complete part one and part two of this activity. You will submit both parts once completed.
Note: You are not performing the experiment—only designing it.
Shape
Introduction
The purpose of this assignment is to design an experiment that another student could follow and use to test whether land or water heats faster.
You will complete the following:
Part One: Experimental Design. Plan out an experiment by answering the guiding questions below.
Part Two: Design a Lab Report. Write the outline of a lab report so that another student could complete the experiment by using the materials listed below:
sand
water
heat lamps
thermometers
cups
Shape
Part One: Experimental Design
Use these guiding questions to create the experiment. Answer each question below:
What hypothesis will the experiment test?
What are the variables?
What purpose would the sand serve?
What purpose would the water serve?
What purpose would the heat lamps serve?
What purpose would the thermometers use?
How can you use these materials to test whether land or water heats faster?
How would you compare whether land or water heats faster?
Within a 24-hour period, at what three points should the temperature be taken? Why?
What would an effective conclusion need to include?
can someone help me with part one please ☆ ～('▽^人) you'll receive 100 points
Land surfaces are much darker so they absorb much more solar radiation than water. Most of the solar radiation is reflected by water which leads in reflecting the solar radiation that reaches the surface back in to the atmosphere.
How does this occur?
Due to lower specific heat of sand it heats up faster than water. On the other hand water requires one calorie of energy to raise the temperature of one gram of water by one degree Celsius. Sand takes 19 calories per gram to raise the temperature of the sand by 1 degree Celsius. While Sand requires fewer calories to raise its temperature one degree Celsius and that’s why it heats up faster than water.
Land absorbs more solar radiation the land surface retains more heat as do the vegetation for energy.
Therefore, during this experiment the sand heats up much faster than water. This happens because of the specific heat of the sand that initiates the heating rapidly under the lamp as the time passes.
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Which of these groups would be MOST concerned with technological developments in insect control?
A.
archaeologists
B.
paleontologists
C.
meteorologists
D.
agriculturists
Answer:
archaeologists
Explanation:
Meteorologist: weather man
Paleontologist: a scientist who studies the history of life on Earth through the fossil record.
Agriculturalist: One who practices agriculture, a farmer, a gardener.
archaeologists: Archaeologists can work for research organizations, consulting and cultural resource management firms, government agencies, and museums.