Answer:
Explanation:
Since mixtures are impure substances that do no combine chemically, they can be separated by physical means. Mixtures are best separated using the different separation techniques. Some of the techniques are filtration, decantation, distillation, e.t.c The separation techniques will restore different components of the mixture into their separate phases and composition.
Question 5 (Worth 2 points)
(03.03 LC)
In which direction does heat move?
From an object with a cool temperature to another object with a cool temperature.
From an object with a higher temperature to an object with a lower temperature.
From an object with a lower temperature to an object with a higher temperature.
From an object with a warm temperature to another object with a warm temperature.
Answer:
From an object with a high temperature to an object with a lower temperature.
Explanation:
How many atoms are there in 1.60 moles of selenium
The number of atoms in 1.60 moles of selenium is approximately 9.64 x 10^23 atoms.
In order to determine the number of atoms in 1.60 moles of selenium, we need to use Avogadro's number. Avogadro's number is 6.022 x 10^23 atoms per mole.
So, for 1.60 moles of selenium, we can calculate the number of atoms as:
Number of atoms = 1.60 moles x 6.022 x 10^23 atoms/mole
Number of atoms = 9.6352 x 10^23 atoms
Therefore, there are approximately 9.64 x 10^23 atoms in 1.60 moles of selenium.
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Iron has a density of 7.86 g/cm3. Calculate the volume (in dL) of a piece of iron having a mass of 3.11 kg
Answer:
The volume is 3.96 dL
Explanation:
Step 1: Convert ml to dl
1Liter = 1000ml = 10³ ml
1Liter = 10 dl
⇒ 1 Liter has 1000ml or 10 dl
⇒ The ratio can be written as : 10dl/ 1000ml = 1 dl / 100ml
Step 2: Convert cm³ =
⇒ 1cm³ is equal to 1 ml.
Step 3: Calculate volume
⇒ We use the formule of density here, which is : Density (p) = mass (g) / volume( cm³)
⇒ 7.86 g/ cm³ = 3110 grams / Volume ( cm³)
⇒Volume = 3110 grams / 7.86g/cm³ = 395.67 cm³
395.67 cm³ = 395.67 ml = 0.39567 L = 3.96 dL
3.96 dL is reported to three significant digits due to the precision reported for the density.
The car you are in is traveling 39 km/hr. How many miles have you gone in 15 minutes?
(Conversion problem)
Answer:
6.06miles
Explanation:
Given parameters:
Speed of the car = 39km/hr
Time = 15minutes
Unkown:
Distance in miles
Solution:
Speed is the change in distance with time.
Speed = [tex]\frac{Distance }{Time}[/tex]
We need to express our parameters in the same workable units. So we should convert the given time to hour.
60min = 1hr
15 min = 0.25hr
Therefore:
Distance = speed x time = 39km/hr x 0.25hr = 9.75km
Now convert km to miles
1.609km = 1mile
9.75km = [tex]\frac{9.75 }{1.609}[/tex] , 6.06miles
White light is made up of
A.
only the types of visible light with very long wavelengths.
B.
ultraviolet light and gamma rays.
C.
a spectrum of many different colors of light.
D.
infrared light and radio waves.
Answer:
C. a spectrum of many different colors of light.
Explanation:
White light is made up of all the colors and all wavelengths.
Answer:
c
Explanation:
The density of liquid Z is 0.9237 g/mL. A student masses a cup
with a sample of liquid Z in it and finds the mass to be 50.7 g.
The mass of the cup alone is 15.92 g. What is the volume of
liquid Z in the cup? (Volume = mass - density)
If the mass of the cup alone is 15.92 g, the volume of liquid Z in the cup will be 39.11 mL.
How to calculate the volume of liquid Z?Volume is a measure of the amount of space that matter occupies. Matter is defined as a physical substance that occupies space and has a mass.
Volume of liquid Z = (Total mass - Cup mass) / Density of liquid Z
= (50.7 g - 15.92 g) / 0.9237 g/mL
= 34.78 g / 0.9237 g/mL
= 39.11 mL.
Therefore, if the mass of the cup alone is 15.92 g, the volume of liquid Z in the cup will be 39.11 mL.
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How many protons and electrons are present in Au+?
Answer:
Protons: 79
Electrons: 78
Explanation:
1. The number of protons is the atomic number (The atomic number for Au on the periodic table is 79)
2. Since the charge is +1 (positive) it means that there's one more proton than electrons. So, 79-1 = 78 electrons
List three criteria used to identify a cold front.
Answer:
Explanation:
A cold front is a transition zone from warm air masses to cold air masses. We use weather elements to identify cold fronts.
Temperature: Since air moves from warm masses to cold masses, the air in a cold front is at different temperatures. The air behind a cold front is warm while the one ahead is cold. This implies that within a cold front is at different temperatures. Precipitation: Prior to the passing of cold front, precipitation is usually rife with low showers. A coldfront in itself is usually accompanied by heavy rainfall full of thunderstorms and lightening. After a coldfront, the showers steadies and decreases. Pressure changes: before a coldfront, the atmospheric pressure decreases steadily. When the front arrives, the pressure further lowers with a sharp increase thereafter. After the front, the pressure can continue to increase. What type of relationship between exists between kinetic energy and temperature ( direct or inverse) 5th grade
Calculate the empirical formula for each compound.
2.677 g Ba, 3.115 g Br
To determine the empirical formula for the compound with given masses of Ba and Br, convert the masses to moles and find the ratio of the moles. In this case, the empirical formula is BaBr2.
Explanation:To calculate the empirical formula for each compound, we need to determine the ratio of the elements in the compound using their masses.
Given the masses of Ba and Br, we can convert them to moles using their respective molar masses.
The molar mass of Ba is 137.33 g/mol, and the molar mass of Br is 79.90 g/mol.
Using these values, we find that there are 0.0195 moles of Ba and 0.0390 moles of Br in the given sample.
To find the empirical formula, we need to divide the moles of each element by the smallest number of moles obtained. In this case, the smallest number of moles is 0.0195.
Dividing the moles of Ba and Br by 0.0195 gives us approximately 1 mole of Ba and 2 moles of Br.
Therefore, the empirical formula for the compound is BaBr2.
an 1.04-L sample of gas at 759 mm Hg pressure
expanded until its volume is 2.24 L. What
the pressure in the expanded gas sample
at constant temperature)?
PV = nRT
where P is the pressure,
V is the volume,
n is the moles of gas,
R is the gas constant,
and T is the temperature.
We must relate this equation to a sample of gas at two different volumes however. Looking at the equation, we can relate the change in volume by:
P1V1 = P2V2
where P1 is the initial pressure,
V1 is the initial volume,
P2 is the final pressure,
and V2 is the final volume.
Looking at this relationship, pressure and volume have an indirect relationship; when one goes up, the other goes down. In that case, we can use this equation to solve for the new pressure.
P1V1 = P2V2
(759 mm Hg)(1.04 L) = P2(2.24 L)
P2 = 352 mm Hg (rounded to three significant figures)
To find the pressure in the expanded gas sample, you can use Boyle's Law: P1V1 = P2V2. Plugging in the values, the pressure in the expanded gas sample is 353.03 mm Hg.
Explanation:To find the pressure in the expanded gas sample, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature. This means that as the volume increases, the pressure decreases, and vice versa.
Using the formula P1V1 = P2V2 (where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume), we can solve for P2:
P2 = P1V1/V2
Plugging in the given values, P1 = 759 mm Hg, V1 = 1.04 L, and V2 = 2.24 L:
P2 = (759 mm Hg)(1.04 L)/(2.24 L) = 353.03 mm Hg
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which is a renewable resource?
oil
wood
iron
coal
Scientists must be curious, honest, creative open minded skeptical , ethical and aware of bias. list 3 ways thinking like a scientist can help u in everyday life when doing things like shopping for a new bike,baking a cake, or reading a magazine??
Answer:
Explanation:
Thinking like a scientist can help me make daily rational decisions between my wants. In that the way I see want would be ultimately to satisfy the most pressing of needs. This is where the open minded nature of scientist will come in. A scientist would rather chose to buy a new bike than going on expensive dates in order to cut and save travel time.
Thinking like a scientist can help me save cost on actually going out there to buy a cake or making one myself. This is the creative aspect of being a scientist. Why have the ingredient and the skill and I will still choose to go out there buy a cake?
A scientist reads a magazine with all mind seeking to establish the bias that might be laden in an edition. This will help him to rationale between different information presented on the pages of the paper. He/she would question the information source and not believe the story completely.
Round the number 0.005758 to 3 sig figs
Answer:
0.00576
Explanation:
To round 0.005758 to three significant figures, we get 0.00576. We only consider the first non-zero digit and the two digits to its right for this purpose.
Explanation:To round the number 0.005758 to three significant figures, we first locate the first non-zero digit from the left, which is 5. We then count two more digits to its right, thus including 7 and 5. We denote these as the significant figures. The next digit after these is 8, since it is more than 5, it rounds the prior digit (5) up by one. Therefore, the number 0.005758 rounded to three significant figures is 0.00576.
Leading zeros are not considered as significant figures. The significant figures in a number are digits that carry meaning contributing to its precision. This includes all non-zero numbers, zeros between significant figures, and any trailing zeros if the number is a decimal.
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Which cell structures do these moss leaf cells contain? Select all that apply.
cell wall
nucleus
chloroplasts
mitochondria
cell membrane
The moss leaf cells contain cell wall, nucleus, chloroplasts, and cell membrane.
Explanation:The moss leaf cells contain the following cell structures:
Cell wall: The cell wall in plant cells provides structural support and protection.Nucleus: The nucleus is the command center of the cell.Chloroplasts: Chloroplasts are responsible for photosynthesis in plant cells.Cell membrane: The cell membrane controls the movement of substances in and out of the cell.Learn more about Moss leaf cell structures here:https://brainly.com/question/28740995
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Moss leaf cells contain a cell wall, a nucleus, chloroplasts, mitochondria, and a cell membrane. The cell wall provides structure, the nucleus acts as the command center, chloroplasts facilitate photosynthesis, mitochondria produce energy, and the cell membrane controls substance movement.
Explanation:Moss leaf cells contain several common structures seen in plant cells. They have a cell wall, which is primarily composed of cellulose and serves functions such as protection, providing structural support, and giving shape to the cells.
These cells also contain a nucleus, which is the control center of the cell. There are chloroplasts present in moss leaf cells; this is where photosynthesis takes place, allowing the plant to convert sunlight into energy. Moss leaf cells also have mitochondria, which are the powerhouses of cells as they are responsible for producing energy in the form of ATP. Finally, these cells have a cell membrane, which is the semipermeable membrane surrounding the cytoplasm of the cell, controlling the movement of substances in and out of the cell.
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What was one main point of Dalton's atomic theory?
A. That atoms were made up of positive and negative charges
B. That atoms made up the smallest form of matter
C. That atoms changed as they formed compounds
D. That atoms had a nucleus at the center
Final answer:
OPTION B.
Dalton's atomic theory highlighted that atoms are the smallest indivisible units of matter and that they combine in whole number ratios to form compounds.
Explanation:
One main point of Dalton's atomic theory is that atoms made up the smallest form of matter. Dalton proposed that all matter is composed of these minute, indivisible particles, which he referred to as atoms, and these atoms cannot be subdivided, created, or destroyed. This concept also suggested that atoms of a given element are identical in size, mass, and other properties, whilst atoms of different elements differ. Additionally, Dalton's theory asserted that atoms of different elements can combine in whole number ratios to form chemical compounds and that during chemical reactions, atoms are rearranged but neither created nor destroyed.
1.1 Outline a method for separating the chalk from potassium chloride,
Answer:
Explanation:
To separate the a mixture of chalk and potassium chloride, we must not that chalk is calcium carbonate compound, CaCO₃.
Calcium carbonate has low solubility in water. KCl is readily soluble in water and it is also an ionic compound.
To separate a mixture of compounds with various solubility, we can carryout dissolution, filtration and evaporation.
We first pour pure water into the mixture. Water will dissolve the potassium chloride readily.
Then using a filter paper we filter out the suspended chalk particles. Leave the filtrate to then dry and collect it.
The solution filtered should be evaporated to dryness. This will leave the KCl behind from the solution.
An atom has 27 protons and 22 neutrons. What is the chemical symbol for the atom?
Consult the periodic table.
O Co
О Cs
O Cr
O Ca
PLEASE HELP!
What is the correct molecular formula for a compound that contains one atom of carbon and four atoms of hydrogen?
CH4
HCH3
H4C
H2CH2
Answer:
CH4, which is the molecular formula for Methane
CH₄ is the correct molecular formula for a compound that contains one atom of carbon and four atoms of hydrogen. Therefore, option A is correct.
What is molecular formula ?The molecular formula is an expression that specifies the number of atoms of each element in a compound molecule. It displays the exact number of atoms in a molecule. Propane, for example, has the molecular formula C₄H₁₀. The given compound contains four carbon atoms and ten hydrogen atoms according to this formula.
A molecular formula tells us which atoms are present in a molecule and how many of each type of atom are present. When there is only one atom of a given type, no subscript is used.
Methane (CH₄) is the most basic hydrocarbon, with one carbon atom and four hydrogen atoms. Methane is an extremely potent greenhouse gas.
Thus, option A is correct.
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gizmos student exploration density laboratory
How can you tell if a crown is made of solid gold?
To determine if a crown is made of solid gold, you can measure its density or look for certain markings or stamps indicating its purity.
Explanation:One way to determine if a crown is made of solid gold is to measure its density. Gold has a density of 19.3 g which is higher than most other metals. To find the density of the crown, you need to measure its mass using a balance and its volume using water displacement. If the density of the crown matches the density of gold, it is likely made of solid gold.
Another way to determine if the crown is made of solid gold is to look for certain markings or stamps. In many countries, solid gold items are required to have a hallmark, which indicates the purity of the gold. This hallmark can usually be found on the inside of the crown. It is important to note that these methods provide a good indication but cannot guarantee with absolute certainty if a crown is made of solid gold.
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12. Describe the results of a chemical change. List four
indicators of chemical change.
Answer:
1. Color Change
2. Change in temperature
3. Noticiable Odor
4. Formation of bubbles
A chemical change, usually irreversible, results in the formation of new substances, the release or absorption of energy, and sometimes the production of gases or solids. Indicators of a chemical change include changes in color, production of a gas, formation of a precipitate, and changes in temperature.
Explanation:A chemical change is a process that results in the transformation of one set of chemical substances to another. During this type of change, the atoms in the reactants rearrange to form one or more different substances, and this is usually an irreversible process. Some common results of a chemical change can include the formation of new substances, the release or absorption of energy, and the production of gases or solid materials.
Four indicators of a chemical change are:
Change in color: For example, when you heat a green copper wire, it may turn black due to the formation of copper oxide.Production of a gas: This can be seen in the effervescence or bubbling when you combine baking soda and vinegar.Formation of a precipitate: A precipitate is a solid that forms from a solution during a chemical reaction. For example, when you mix solutions of silver nitrate and sodium chloride, a white precipitate of silver chloride forms.Change in temperature: Many chemical reactions release or absorb heat. For example, the burning of wood releases heat.Learn more about Chemical Change here:https://brainly.com/question/31633022
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Check the statement(s) below to ensure that distance readings are accurate.
Answer: A.Estimate measurements to the nearest 0.05cm
D.start all measurements from the zero (0) mark
For Edg
Explanation:
What volume of a product is required to make half liter of 0.25% of the product solution?
Answer:
0.00125 liters of product
Explanation:
So the question it tell you that 0.25 % from 0.5 liters is pure product.
So we calculate the volume of pure product:
volume = (0.25 / 100) × 0.5 = 0.00125 liters
Now to produce the solution over 0.00125 liters of pure product you add (most likely) water until you reach a volume of 0.5 liters.
Mole conversions.
Find the number of moles of argon in 607g of argon?
Answer:
24249.65 mol
Explanation:
n=MM × m
n= 39.95 ×607
n=24249.65
Where are the electrons found in Bohr's atomic model?
Answer:
The answer to your question is letter D.
Explanation:
Bohr tells us that the electrons which have a negative charge clicle the orbits in specific nucleus, so the right answer is letter D.
Letter C is not possible because the electrons are in orbits circling the nucleus where the protons are.
Letter B is not correct because electrons are distributed in orbits but the amount of electrons in one orbit is different to the other one.
The electrons found around the nucleus in specific orbit in Bohr's atomic model.
So, option D is correct one.
What is Bohr's atomic model?This model explained about position of electron and their energy levels.
According to Bohr's atomic model the electron revolve around the nucleus in particular orbit or shell.
Rutherford's model described about nucleus which is surrounded by the electrons which is negatively charged.
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Convert 234 kJ to kcal. Only include the numerical value in your answer. Respond with the correct number of significant figures in scientific notation.
Answer:
234 KJ ≡ 55.887 Kcal
Explanation:
∴ J ≡ Kg/m².s² ≡ N.m = 0.2389 cal
∴ cal = 4.187 J
⇒ 234 KJ * ( 1000 J / KJ ) * ( cal / 4.187 J ) * ( Kcal / 1000 cal ) = 55.887 Kcal
Answer : The correct number of significant figures in scientific notation is [tex]9.791\times 10^2\text{ kilocalorie}[/tex]
Explanation :
The conversion used from kilojoules (kJ) to kilocalories (kcal) is:
1 Joule = 4.184 Calorie
or,
1 kilojoule = 4.184 kilocalorie
As we are given that the energy 234 kJ. Now we have to convert it into kcal.
As, [tex]1\text{ kilojoule}=4.184\text{ kilocalorie}[/tex]
So, [tex]234\text{ kilojoule}=\frac{234\text{ kilojoule}}{1\text{ kilojoule}}\times 4.184\text{ kilocalorie}=9.791\times 10^2\text{ kilocalorie}[/tex]
Therefore, the correct number of significant figures in scientific notation is [tex]9.791\times 10^2\text{ kilocalorie}[/tex]
Balance these equations
N2 + O2 > NO
Answer:
N2 + O2 ---> 2NO
Explanation:
There has to be the same amount of elements on both sides of the equation and it's the rules of chemistry that you cannot add subscripts to the elements because that just changes the whole compound so you must always add coefficients. (The 2 distributes to both elements)
Final answer:
The balanced equation for the reaction between molecular nitrogen (N2) and oxygen (O2) to form nitrogen monoxide (NO) is N2(g) + O2(g) → 2 NO(g). Adding more O2 to a system at equilibrium will shift it to form more NO.
Explanation:
To balance the given equation N2 + O2 → NO, one must ensure that there are equal numbers of each type of atom on both sides of the equation. Starting with nitrogen, we have one N2 molecule, which contains 2 N atoms. On the right side, there is one NO molecule, which contains only 1 N atom, so we can place a coefficient of 2 in front of NO to balance nitrogen. Now we have 2 atoms of nitrogen on both sides. Initially, we have one O2 molecule with 2 O atoms and only one O atom in each NO molecule. After balancing nitrogen, we have two NO molecules, bringing the number of O atoms to two, which balances the oxygen atoms as well. So the balanced equation is N2(g) + O2(g) = 2 NO(g).
If more O2 is added to this system at equilibrium, according to Le Chatelier's Principle, the system would adjust to counteract this change by forming more NO, thus consuming some of the added O2 and potentially shifting the equilibrium position.
1. If a person's mass is 56 kg, what is this weight in pounds?
56kg
Answer:
123lb
Explanation:
lb= 2.2046 kg
56×2.2046= 123lb
A person with a mass of 56 kg weighs approximately 123.46 pounds.
The conversion uses the factor that 1 kilogram is approximately 2.20462 pounds. Mass is the amount of matter, while weight is the gravitational force on that matter.
To convert a person's mass from kilograms to pounds, you can use the conversion factor that 1 kilogram is approximately equivalent to 2.20462 pounds.
Conversion Calculation:
Given a mass of 56 kg, you can calculate the weight in pounds as follows:
Weight in pounds = Mass in kilograms × Conversion factor
Weight in pounds = 56 kg × 2.20462 lbs/kg
Weight in pounds ≈ 123.46 lbs
So, a person with a mass of 56 kg weighs approximately 123.46 pounds.
Understanding Mass and Weight:
Note that mass is a measure of the amount of matter in an object, while weight is the force exerted by gravity on that mass. In the US customary units, weight can be expressed in pounds, where 1 lb is equivalent to a mass of 0.4536 kg.
A mixture In which the particles are to small to b seen with the naked eye is?
Answer:
When the particles of a solution or a mixture are so small that they cannot be seen directly from our naked eyes the mixture was formed due called colloid. These are heterogeneous mixtures.
Explanation:
There are different methods to tell a mixture from compound and in this case it is done by passing light through it. When a beam of light is passed through this mixture the particles although being small all are enough such that scattering of the beam takes place and its path can be seen.
Please Help!!!1
Which member of each pair has the greater negative electron affinity?
a) Se or Br
b) Si or Al
c) Na or Cl
9. Which member of each pair has the larger radius?
a) Ca or Mg
b) Al or P
c) F-1 or F
10. Which member of each pair has the higher ionization energy?
a) He or Ne
b) Na or Mg
c) Ca or Ca +2
Answer:
the red one in each pair
Explanation:
see the picture2
Answer:
Here's what I find.
Explanation:
8. Electron affinity
The atom that is closer to having a complete valence shell (is further to the right in the Periodic Table) will have the greater electron density. The correct answers are:
(a) Br
(b) Si
(c) Cl
9. Atomic radius
(a) Ca. Ca is one period closer to the bottom of the Periodic Table. It has one more electron shell than Mg, so its valence electrons are further from the nucleus.
(b) Al. P is two atoms to the right of Al, so it has two more protons in the nucleus. Its valence electrons are held more tightly, so it is the smaller atom.
(c) F⁻. An anion is always larger than its neutral atom the added electron increases electron repulsions. The electrons move further out so they can reduce these repulsions.
10. Ionization energy
(a) He. He is a smaller atom, so its electrons are closer to the nucleus and more difficult to remove.
(b) Mg. Mg is to the right of Na and has a filled 3s subshell. Both factors make it more difficult to remove an electron.
(c) Ca²⁺. Once you have removed the two valence electrons from an atom of Ca, you have exposed its argon-like inner core. It takes more energy to remove an electron from a completed shell.