Answer:
4 mL
Explanation:
Use the density formula, d = m/v
Plug in the density and mass to solve for v:
4 = 16/v
4v = 16
v = 4
So, the volume is 4 mL
Scientific models are always correct
✅Models are approximations and omit details, but a good model will robustly output the quantities it was developed for. Models do not always predict the future. This does not make them unscientific, but it makes them a target for science skeptics. ... But correct predictions alone don't make for a good scientific model
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What is the difference between physical and chemical properties? Give 3 examples of each.
Explanation:
1.A physical property is an aspect of matter that can be seen or measured without changing its chemical composition. Examples of physical properties include color, molecular weight, and volume.
A chemical property is observed only by changing the chemical identity of a substance. In other words, the only way to detect a chemical is to perform a chemical reaction.
2.This property measures the ability of chemical change. Examples of chemical properties are reactivity, flammability, and oxidation state.
The physical properties of a substance do not involve any chemical reaction. These include density, color, mass, hardness, freezing points, electrical properties, and the like.
Chemical properties include the reaction of chemicals with other substances. These reactions lead to the disappearance of the raw material and the appearance of new materials that have different physical and chemical properties.
3.Chemical properties can be compared to physical properties; On the contrary, they are recognizable without changing the structure of matter. However, for many properties in the field of physical chemistry and other disciplines at the boundary between chemistry and physics, the distinction can be a matter for the researcher's point of view. The properties of materials, both physical and chemical, can be seen as metaphysical; This means that it is secondary to the principle of tangible reality. Multiple metamorphic layers are also possible.
A student has two samples of NaCl, each one from a different source. Assume that the only potential contaminant in each sample is KCl. The student runs an experiment to determine the percent by mass of chlorine in each sample. From the results of this experiment alone, which of the following questions is most likely to be answered? A. Which sample has the higher purity? B. Which sample has the higher density? C. What is the source of the contaminants present in each of the samples? D. Which sample came from a salt mine, and which sample came from the ocean?
Answer:
The correct option is;
A. Which sample has the higher purity
Explanation:
The information given relate to the presence of two samples of NaCl, from different sources
The only potential contaminant in each of the sources = KCl
The content of the sample = NaCl
The molar mass of NaCl = 58.44 g/mol
The molar mass of KCl = 74.5513 g/mol
Let the number of moles of KCl in the sample = X
For a given mass of NaCl, KCl mixture, we have;
The molar mass of potassium = 39.0983 g/mol
The molar mass of chlorine = 35.453 g/mol
The molar mass of sodium ≈ 23 g/mol
Therefore;
Each mole of KCl, will yield 35.453 g/mol per 74.5513 g/mol of KCl
While each mole of NaCl will yield 35.453 g/mol per 58.44 g/mol of NaCl
Therefore, the pure sodium chloride sample will yield more chlorine per unit mass of sample.
As such if the two samples have the same mass, the sample with the contaminant of KCl will yield less mass of chlorine per unit mass of the sample, from which the student will be able to tell the purity of the solution.
The sample with the higher purity will yield a higher mass chlorine per unit mass of the sample.
The question that will be most likely answered is ( A ) ; which sample has the higher purity
From the question there are two samples of NaCl from different sources that has a contaminant of KCl in each of them .
A student running an experiment to determine the percentage by mass of Chlorine in each sample is to determine which of the sample contains a lesser amount of the contaminant KCl.
Note : The purer the NaCl sample the more chlorine per unit mass of sample.
Hence the question that can be answered by this experiment is which sample has the higher purity.
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How does the number of protons affect the atom?
Protons are the subatomic particles which has positive charge.
The protons define the element.
So for example, every element that has 1 proton is hydrogen.
Hydrogen is a gas.
Every element that has 23 protons would be vanadium.
Vanadium is a chemical element with an atomic number 23.
ANALYZE Explain why the liquid in a thermometer expands as temperature increases.
How is this related to the kinetic energy of the particles that make up the liquid?
The liquid expands as its temperature increases like stated. This is the same as saying that it occupies more space as temperature increases. Therefore it 'uses up' more of the space inside the thermometer as the temperature increases. the relation with kinetic energy is through the kinetic energy being used as it flows and expands, because of the heat, and mercurys relationship with heat. sorry if that's off :/
I need help please comrades, I will give 5 stars and mark you guys as the brainliest
Explanation:
Alkali metals have low melting points, low electronegativity, and low ionization energies. They are malleable and ductile. They are also good conductors of heat and energy.
Since they have one electron in their valence, alkali metals are very reactive. This means that they are not found alone in nature.
How does a forest fire model the energy flow of fuel combustion?
Answer:
Explanation:
Combustion can be defined as the burning of a compound in the presence of oxygen to produce carbon dioxide and water. Because it involves the release of heat (energy), it is referred to as an exothermic reaction.
Fuel is an organic compound and it's combustion will also go through the process above and also releases heat (exothermic reaction) into the atmosphere after burning. However, same can be said about forest fire also; as the forest is made up of plants (whose major constituents are organic also). The forest fire can also be termed as combustion because it burns in the presence of oxygen, releasing heat (energy) into the atmosphere (which also makes it an exothermic reaction).
A forest fire models the energy flow of fuel combustion by:
Reacting with oxygen to create heatCombustion is the chemical process whereby there is a redox reaction that causes burning and produces smoke in the form of gas.
For combustion to occur, the following processes must occur:
There must be the presence of an oxidantThere has to be a reaction between the oxidant and heat.The end product must be carbon dioxide and water.As a result of this, a forest fire models the energy flow of fuel combustion by making use of a reactant like wood to create combustion.
Because this process expels energy, then it is known as an exothermic reaction.
Therefore, forest fire occurs:
In the presence of:oxygenBy expelling heat By producing carbon dioxide and water.Read more here:
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3. How many atoms are found in 5.20 g of magnesium (Mg)?
Explanation:
In order to go from mass of magnesium to atoms of magnesium, we have to do two things:
Convert mass of Mg to moles of Mg using the molar mass of Mg as a conversion factor
Convert moles of Mg to atoms of Mg using Avogadro's number (6.02×1023) as a conversion factor
Step 1:
Before we start, I should note that the molar mass of Mg is 24.31gmol. We can go from mass to moles using dimensional analysis. The key to dimensional analysis is understanding that the units that you don't need any more cancel out, leaving the units that are desired:
48.60g
×1mol24.31g
=2.00mol
Step 2:
We'll use this relationship:
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Using the moles of Mg that we just obtained, we can use Avogrado's number to perform dimensional analysis in order to cancel out units of mol to end up with atoms of Mg:
2.00mol
×6.02×1023atoms1mol
=1.204×1024atoms
Thus, 48.60g of Mg is equivalent to 1.204×1024atoms
Hope this helped :)
What do you understand by long form of periodic table? Explain some of its applications?
Answer:
Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.
Answer:
Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.
What must occur for a hypothesis to be considered fully proven?
A
Newspapers must report the event.
B
Public opinion must agree with the results.
C
Other scientists must repeat the experiment and get the same results.
D
There must be a specific number of controlled experiments.
*
The state of matter with the highest energy and most movement is
Answer:
gas
Explanation:
Please someone explain the digestion reaction, what are the things needed for the reaction and what are the products or results? 10th grade chemistry
Answer:
Chemical digestion involves the secretions of enzymes throughout your digestive tract. These enzymes break the chemical bonds that hold food particles together. This allows food to be broken down into small, digestible parts. Digestion involves taking large portions of food and breaking them down into micronutrients small enough to be absorbed by cells. Chewing and peristalsis help with this, but they don’t make particles small enough. That’s where chemical digestion comes in.
Chemical digestion breaks down different nutrients, such as proteins, carbohydrates, and fats, into even smaller parts:
Fats break down into fatty acids and monoglycerides.
Nucleic acids break down into nucleotides.
Polysaccharides, or carbohydrate sugars, break down into monosaccharides.
Proteins break down into amino acids.
Explanation:
I hope this helps!
What is the best inference readers can make based on the claims in the advertisement?
Apex is the only reliable internet streaming service in the area.
Apex has more channels for the money than some other streaming services.
All other streaming services charge more per channel than Apex does.
Other streaming services offer less desirable channels than Apex.
Answer:
Apex has more channels for the money than some other streaming services.
Explanation:
Due to lack of info:
you can't infer that Apex is reliable
you can't infer that other services charge more PER CHANNEL
you can't infer that other services are less desirable
The only reasonable inference would be my answer and I got it right on ED2020
Answer:
Or in other words B
to make it more simple
Explanation:
Label the heat curves with the correct phase changes
100°C
Temperature H20 (°C)
0°c
Vaporization
Melting
Condensation
Freezing
Answer:
tap to view photo
1.melting
2.freezing
3.vaporization
4.condensation
what is acid, base, salt?
Answer:Acid ,Base ,Salt
Explanation: An acid is defined as a substance whose water solution tastes sour, turns blue litmus red and neutralizes bases
A substance is called base if its aqueous solution tastes bitter, turns red litmus blue or neutralizes acids.
Salt is a neutral substance whose aqueous solution does not affect litmus.
Hope it will help u....
Explain the following observation: Wet clothing spread out on a clothes line dries more quickly than wet clothing left in a pile.
The reason wet clothes spread out dry faster than when left in a pile is because there is more surface area therefore the rate of evaporation increases and this decreases the time it takes for the water molecules to diffuse into the air.
3. How does the size of the Kelvin and the Celsius degree compare? Explain.
1
Answer:
Lo más probable es que esté haciendo la conversión de Celsius a Kelvin
En ciencia, la unidad Kelvin se usa para medir la temperatura
La fórmula para Celsius a Kelvin es C + 273 = K
Explanation:
me das coronita
a rate of change is it velocity or acceleration .
Answer:
Acceleration is the correct answer. Hope this helps!
Explanation:
Definition: The possible state for an electron of an atom that is proportional to its distance to the nucleus.
Answer:
"Energy Level" is the correct approach.
Explanation:
An electric charge electron density during an atomic seems to be the potential condition for this with the electron and therefore is proportional to its density from the nucleus. The ground state seems to be a particle, nucleus, and perhaps molecule with the corresponding energy level as well as its electrodes. The electron travels to something like a higher or excited energy state whenever there's an improvement in electricity, and has also been stimulated.What are the postulates of Dalton's atomic theory?
Answer:
All matter consists of indivisible particles called atoms. Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms. Hope that helps : )
hello,
here is your answer:
**********
Postulates of Dalton's atomic theory:
⇒ All matter is made up of very tiny particles called atoms.
⇒ Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.
⇒ Atoms of a given element are identical in mass and chemical properties.
⇒ Atoms of different elements have different masses and chemical properties.
⇒ Atoms combine in the ratio of small whole numbers to form compounds.
⇒ The relative number and kinds of atoms are constant in a given compound.
⇒ Atoms of the same elements can combine in more than one ratio to form more than one compound.
**********
hope this helped,
:)
What are some examples of proton?
Answer: hydrogen atom Explanation: the nucleus of a hydrogen atom is an example of a proton, each atom of hydrogen has 1 proton.
a study was done to find if different tire treads affect the breaking distance of a car what is the independent variable the dependent variable and the constant
Answer:
Independent variable: Different tyre treads
Dependent variable: Breaking distance
Constant: Same car
Explanation:
In an experiment, an independent variable is that variable which the experimenter controls or manipulates to effect an outcome. In this experiment, the tyre treads are changed to see if it would affect the breaking distance, hence, the DIFFERENT TYRE TREADS is the independent variable.
On the other hand, a dependent variable is the variable that responds to the manipulation of the independent variable. In other words, it is the outcome of the experiment. In this experiment, the BREAKING DISTANCE is the responding or dependent variable.
Constant or controlled variable is that variable that is kept constant or unchanged throughout the course of the experiment. The constant, if changed, will influence the result of the experiment. The constant in this experiment is the CAR since the same car (unchanged) was used for the experiment.
SEP Engage in Argument A classmate claims that state of matter is an extensive property because it can vary with temperature. For example, hydrogen changes into a liquid at very low temperatures and high pressure, while iron can melt into a liquid at very high temperatures. Do you agree with the classmate? Write an argument to support your position.
Answer: I agree with the student because in the question prior to this One question stated thatExtensive properties very with the amount of matter ina sample, so yes i agree.
Explanation:
If the Earth is represented by a basketball placed mid-court, how far away should the object representing the Moon be placed?
Answer:
The moon should be at 543 cm.
Explanation:
If according to scientists the distance from the earth to the moon is approximately 384400 km
.
The earth has a radius of 6371 km.
A basketball has a radius of 9 cm. (Using a basketball of this radius as a reference)
With these data you can make a rule of 3:
The earth in centimeters has a radius of 6.371e+8 cm.
So: If the earth has a radius of 6.371e+8 cm and a distance to the moon of 384,400 km, what would the distance be if the earth had a radius of 9 cm?
6.371e+8 cm : 9 cm
384400 km : X
X = (384400 km * 9 cm) / 6.371e+8 cm
X = 5.43e-3 km converting to centimeters would give that:
X = 543 cm
The moon should be at 543 cm from Earth.
Is wood a colloid or suspension ?
Greg has 36 DVDs in his collection.
• 1/4 are drama.
• 1/9 are concerts.
• The remaining DVDs are comedies.
How many are drama and comedy?
Answer:
14
Explanation:
1. Explain what is in a buffer. Discuss the function of a buffer. How will pH change when small amounts of acids or bases are added to the buffer solution? 2. Cooks use baking soda to make cakes light and fluffy. You might have used baking soda yourself. Baking soda is NaHCO3. A 0.1 M solution of baking soda in water has a [H+] of about 4.0 × 10–9. (You may prefer to think of the hydronium ion concentration, [H3O+], as 4.0 × 10–9.) Write the formula for the calculation of pH, and then show each step as you calculate the pH of a 0.1 M solution of baking soda. 3. Before tackling this problem, be sure you know how to find the antilog of a number using a scientific calculator. A solution has a pH of 5.4. Write the formula you will use to calculate the [H+] and then show all your work leading to the determination of [H+].
Answer:
(1) See below, (2) About 8.4 pH, (3) About 3.981 * 10⁻⁶ mol dm⁻³
Explanation:
1. A buffer is a solution that resist pH when adding a basic or acidic compound. It's purpose is to neutralize added acids and bases.
2. Remember that the formula for pH is -log [H+]. We have a 0.1 M solution of baking soda in water with [H+] of about 4.0 × 10⁻⁹. Therefore we can calculate the pH as follows...
pH = -log (4.0 × 10⁻⁹)
pH = -(-8.39794...) = (About) 8.4 pH of 0.1 M of baking soda
3. This question has a similar set up...
pH = -log [H+]
[H+] = inverse of log^- pH
[H+] = 10^-5.4 = (About) 3.981 [tex]*[/tex] 10⁻⁶
What type of quantity is momentum
Answer:
Vector quantityExplanation:
Momentum is a vector quantity because it has both magnitude and direction
three blocks are shown here pls HELPPPP:
Which statement is correct?
Block A has the greatest density.
Block B has the greatest density.
The density of Block A is equal to the density of Block B.
The density of Block B is equal to the density of Block C.
The density of Block A is equal to the density of Block B, therefore statement (c) is correct .
What do you mean the term density ?Density is the ratio between mass and volume or mass per unit volume.
The SI unit of density is kilogram per cubic meter (kg/m3).
It is represented in the c g s unit of grams per cubic centimeter (g/cm3).
It is formulated by -:
Density=Mass/Volume
To calculate densities in each boxes -:
For Block A -
mass=2 kg
volume= l b h
volume=5×2×1
volume=10 cm³
Therefore,
density for block A=mass/volume
density for block A=0.2 g/cm³
For Block B-
mass=2 kg
volume= l b h
volume=10cm³
Therefore,
density for block B=mass/volume
density for block B=0.2 g/cm³
For Block C-
mass=3 kg
volume= l b h
volume=10cm³
Therefore,
density for block C=mass/volume
density for block C=0.3 g/cm³
Hence the density of Block A is equal to the density of Block B ,therefore option (c) is correct.
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Students are conducting an experiment to determine if sugars are present in foods. They heat a test tube containing a sugar solution in a beaker of water. Which of these is an UNSAFE laboratory practice in this experiment?
a. heating the sugar solution in a closed test tube
b. rinsing hands with water after handling the materials
c. using a test tube clamp to hold the test tube
d. wearing safety goggles while heating the sugar solution
Answer:
A
Explanation:
Benedict's test is the ideal standard test to distinguished between reducing(glucose) and Non reducing(diasaccharides,sucrose).
Benedict's tests gives a positive test for the presence of reducing sugar,with the initial mixture of the sugar solution changing from the initials green and orange color and brick red precipate of copper (ii) ,which would not dissolve in solution.
However, with non reducing the Benedict's gives a negative test.Because no color change occurs.
In either case,the chemical reaction that occurs as the solution gained heat is exothermic and this may lead to boiling of the solution and spilling onto the burner,which may lead to explosion.