Explanation:
As it is known that volume of an irregular object cannot be measured because we cannot measure the volume of a curve.
As a result, if we immerse an irregular solid object into a beaker or container filled with water then the volume of water displaced by the object will be equal to the volume of object itself.
Hence, we get to know the volume of irregular solid object by doing so that is why, water displacement is an effective way of measuring the volume of an irregular solid.
A mineral must be_______ rather than organic. Organic materials are formed from_______ things. Minerals must be made from materials that were non-living things.
Which of the following is a pure substance?
Air
Sand
Steel
Water
Please help out, thanks!
What is basic salt ?
A basic salt or alkali sat is any salt that hydrolyzes to form a basic solution.
Explanation:In simple terms, It is a salt which is when dissolved in water form a solution of PH less than 7.
It contains amounts of both hydroxide and other anions.
White lead is an example. It is basic lead carbonate, or lead carbonate hydroxide.
A basic salt is an ionic compound formed from the reaction of a strong base and a weak acid, resulting in a solution that releases OH⁻ ions, making it basic.
What is empirical evidence? (4 points) A prediction of test results before an experiment A retest of experimental results to make them reliable A conclusion derived from evidence and logical reasoning Knowledge gained by observation or measurement
Answer: Knowledge gained by observation or measurement
Explanation: Empirical formula is the formula which is used to determine the basic molecular formula of any compound.
It is determine by the knowledge of the small small particularities of the elements present in the compound.
Thus emperical evidence is the knowledge gained by observation or measurement.
An object has a mass of 20 g and displaces a volume of 5 mL. What is the object's density?
Hey There!:
The density is the quotient between the mass of a material and the volume occupied by it, The density can be expressed for a substance or for a mixture of substances. For example, water density in ambient conditions is equal to 1.00 g/cm3, which means that in 1 cm³ or 1 mL, there are 1.0 g of water. Therefore:
D = m / V
D = 20 g / 5 mL
D = 4,0 g/mL
hope that helps!
The density of the object will be "4 g/mL". A further solution is provided below.
The given values in the question are:
Mass,
M = 20 g
Volume,
V = 5 mL
The density of the object will be:
→ [tex]Density = \frac{Mass}{Volume}[/tex]
By substituting the values, we get
→ [tex]= \frac{20}{5}[/tex]
→ [tex]= 4 \ g/mL[/tex]
Thus the above answer is right.
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Scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding about the world?
A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
B. Scientists hope to learn more about how many stars are in space.
C. Scientists are familiar with some galaxies, but they do not know how many galaxies exist.
D. Scientist wonder if other plants can support life, and some scientist wonder if there are aliens.
A., Scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
This is because the other questions are saying how scientists still have questions about certain things in space, while answer A is already a confirmed answer.
Scientists put a few drops of dilute hydrochloric acid on a lab table. For safety purposes, the scientist because some baking soda on to the spill. Which observation would provide the best evidence that chemical reaction occurred?
F. The baking soda in hydrochloric acid combined, and bubbles formed.
G. The baking soda absorb the hydrochloric acid.
H. Some of the baking soda dissolved in the acid
J. The hydrochloric acid evaporated, Leaving only the baking soda
Answer:
F. The baking soda combined with the hydrochloric acid and bubbles formed.
Explanation:
The formation of gas bubbles is usually a sign of a chemical reaction.
G. is wrong because the absorption of a liquid by a solid is a physical process. Think of using a paper towel to clean up spilled water.
H. is wrong because the dissolving of a solid is a physical process. Think of dissolving sugar in your coffee.
J. is wrong because evaporation is a physical process. Think of a puddle of water drying up in the hot sun.
In metallic bonding, move freely between neighboring atoms. Metals are ductile because the forces that hold their atoms together are .
In metallic bonding, delocalized electrons move freely which allows metal atoms to slide past each other, making metals ductile due to the metallic bonding forces. This bond involves the attraction between positive metal ions and a sea of delocalized electrons, which also gives metals their conductive and other distinctive properties.
Explanation:In metallic bonding, electrons move freely between neighboring atoms. This is often described by the 'sea of electrons' model where valence electrons are delocalized over the entire structure. Because these electrons are not attached to any one atom specifically, they allow the metal atoms to slide past each other without breaking the bond. Therefore, metals are not only malleable but also ductile. The ductility of metals is due to the delocalized electrons serving as a buffer, allowing the metal ions to slide past one another when a force is applied, without the crystal structure shattering like what occurs in the more brittle ionic compounds.
These properties are a consequence of the metallic bonding which involves the electrostatic attraction between the positive metal ions and the sea of delocalized electrons surrounding them. The free electron model of metals helps to explain their ability to conduct heat and electricity, as well as their high melting points and density due to the close packing of the positive nuclei and the strong bonding within the metal lattice.
Select the choice that best completes the following sentence: In general, asexual reproduction is used by _______ organisms. A. simple B. underwater C. extinct D. complex
i think it A. simple
It's either A or B, I hope this helped XD.
A certain reaction has the form aA → bB. At a particular temperature and [A]0 = 2.80 × 10-3 molar, data was collected of concentration versus time for this reaction. A plot of 1/[A]t versus time resulted in a straight line with a slope value of 3.60 × 10-2 M-1s-1. What is the reaction order and rate law for this reaction?
A.
second order, rate = k[A]2
B.
first order, rate = k[A]2
C.
second order, rate = k[A]
D.
first order, rate = k[A]
Hey There!
aA => bB
[A]o = 2.80*10⁻³ M
When drew a plot 1 / [A]t versus time resulted a straight line inidicates second order reation .
Therefore , Rate = K[A]²
Answer A
Hope that helps!
Answer:
The reaction is second order.
The rate law is:
[tex]Rate=K[A]^{2}[/tex]
Explanation:
The following plots and line shows the order of reaction
a) if we are getting a straight line in a plot with concentration versus time, the order of reaction is zero.
b) if we are getting a straight line in a plot with ln(concentration) versus time, the order of reaction is one.
c) if we are getting a straight line in a plot with inverse of concentration versus time, the order of reaction is two.
The reaction is second order.
The rate law is:
[tex]Rate=K[A]^{2}[/tex]
Help please, a 20 point reward for those who do help!!!!
A piece of unknown metal with mass 68.6 g is heated to an initial temperature of 100 °C and dropped into 8.4 g of water (with an initial temperature of 20 °C) in a calorimeter. The final temperature of the system is 52.1°C. The specific heat of water is 4.184 J/g*⁰C. What is the specific heat of the metal?
A. 0.171
B. 0.343
C. 1.717
D. 3.433
Answer:- B. 0.343
Solution:- Hot metal is added to water so the heat is gained by water and lost by the metal. We assume no heat is lost to the surroundings, so the heat lost by metal is totally used to raise the temperature of water.
First, we will calculate the heat gained by water using the formula:
[tex]q=mc\Delta T[/tex]
where, q is the heat energy, m is the mass, c is specific heat and delta T is change in temperature.
For water:
m = 8.4 g
c = [tex]\frac{4.184J}{g.^0C}[/tex]
[tex]\Delta T=52.1-20=32.1 ^0C[/tex]
Let's plug in the values and calculate q for water:
[tex]q=(8.4g)(\frac{4.184J}{g.^0C})(32.1^0C)[/tex]
= 1128.17 J
Same amount of heat is lost by the metal. Mass of metal is 68.6 g.
[tex]\Delta T=100-52.1=47.9^0C[/tex]
let's plug in the values in the same formula and calculate the specific heat of metal:
[tex]1128.17J=(68.6g)(c)(47.9^0C)[/tex]
[tex]c=\frac{1128.17J}{(68.6g)(47.9^0C)}[/tex]
[tex]c=\frac{0.343J}{g.^0C}[/tex]
So, the right choice is B.0.343.
Answer:
B
Explanation:
Got it right on ODY(Oddesyware) ;) have an amazing day y'all
Complete combustion of 2.90g of a hydrocarbon produced 9.32g of CO2 and 3.18g of H2O. What is the empirical formula for the hydrocarbon?
Answer;
= C3H5
Explanation and solution;
1 mole of CO2 contains 44 g, of which 12 g are carbon
Thus, mass of carbon in 9.32 g will be;
(12/44) × 9.32 g = 2.542 g
Mass of Hydrogen in 3.18 g of water;
= (2/18) × 3.18 g = 0.353 g
we then find the number of moles;
Moles of carbon ; 2.542 /12 = 0.2118 moles
Moles of Hydrogen = 0.353 moles
The ratios of C ; H ;
= 1 : 0.353 /0.2118
= 1 : 5/3
= 3: 5
Therefore; the empirical formula of the hydrogen carbon is; C3H5
Mass of CO₂ = 9.32g
Molar mass of CO₂ = 44 g/mol
Mass of H₂O = 3.18 g
Molar mass of H₂O = 18 g/mol
Moles = mass/ molar mass
9.32 g CO₂ x (1 mol CO₂ / 44 g CO₂) = 0.2118 mol CO₂
Every CO₂ molecule has 1 Carbon atom, therefore 0.2118 mol of CO₂ will have 0.2118 moles of C
3.18 g H₂O x (1 mol H₂O / 18 g H₂O) = 0.177 mol H₂O
In every H₂O molecule there are 2 atoms of H therefore 0.177 mol of H₂O will have 2 x 0.177 or 0.354 moles of H
Now the ratio of C : H = 0.2118 : 0.354
To get the whole number we divide both numbers in the ratio by the lowest number.
C : H
= (0.2118/0.2118) : (0.354 / 0.2118)
= 1:1 .67
Since we cannot round, we multiply by 3 to clear the fraction:
C= 1 x 3 =3
H = 1.67 x 3 = 5
Thus the empirical formula is C₃H₅.
eukaryote:mitosis:: prokaryote:
a.binary fission
b.budding
c.both binary fission and budding
d.none of the above
The process of cell division is different in prokaryotes and eukaryotes as prokaryotes have a primitive cell structure which is not membrane bound. In eukaryotes the process of cell division is termed as mitosis. In prokaryotic cells like a bacterial cell, the cell divides by a process called binary fission, where each cell is cleaved into two identical cells each with its own chromosomal set. Budding is process of asexual reproduction and is different from cell division.
Therefore, the correct answer will be a. binary fission.
Which statement about scientific consensus is true?
A.
It represents the beliefs of most scientists.
B.
It is the only way to prove a theory true.
C.
It is necessary to form a hypothesis.
D.
It is an assurance that the interpretations of a study are correct.
E.
It is necessary before research can be published in a science journal.
Answer: A. It represents the beliefs of most scientists.
Explanation:
Scientific consensus can be define as opinion, judgement and belief in a particular field of scientific study proposed by the scientific community which involves researchers, and science scholars. The agreement of the large population for a same cause can be achieved by communicating about the topic over the conferences, replication or re-implementation of the scientific procedures so as to obtain data which can be accepted by the scientific community.
On the basis of the above explanation, A. It represents the beliefs of most scientists. is the correct option.
Answer:
It represents the beliefs of most scientists
Explanation:
Consider this reaction: 2H+ + CO32- → H2O + CO2. Identify each of the following as a product, a reactant, or a coefficient.
Correct answers are
CO32-: Reactant
H2O: product
CO2: product
The 2 in front of H+: Coefficient
Species that occur on the left hand side of the reaction equation are reactants while species that occur on the right hand side of a reaction equation are called products.
A chemical reaction involves the combination of two or more substances to form a new substance(s). Sometimes, a chemical reaction may involves the breaking up a substance into other substances.
Given the reaction;
2H+ + CO32- → H2O + CO2
2H+ and CO32- are reactants while H2O and CO2 are products. The number 2 is a coefficient.
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What describes the basis of the band theory of metallic bonding
1. Metallic bond is a type of chemical bond.
2. Metallic bond is formed between electrons and positively charged metal ions.
3. Metallic radius is defined as one-half of the distance between the two adjacent metal ions.
4. Metallic bond increace electrical and thermal conductivity.
5. Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.
An undiscovered element has three naturally occurring isotopes of X-55, X-57, and X-58. Isotope X-55 has an abundance of 27.80 % and isotope X-57 has an abundance of 44.39 %. What is the average mass of this element in amu?
Answer: The average atomic mass of this elements is 56.7221 amu.
Explanation: The average atomic mass is the sum of the masses of its isotopes each multiplied by their natural abundances.
[tex]\text{average atomic mass}=\sum_{i=1}^{n}(mass)_i(\text{Fractional abundance})_i[/tex] .....(1)
[tex]\text{Fractional abundance}=\frac{\%\text{ abundance}}{100}[/tex]
We are given 3 isotopes of an element.
For Isotope [tex]X^{55}[/tex],
Mass = 55 amu
Fractional abundance = 0.2780
For isotope [tex]X^{57}[/tex],
Mass = 57 amu
Fractional abundance = 0.4439
Total Fractional abundance = 1
For isotope [tex]X^{58}[/tex],
Mass = 58 amu
Fractional abundance = Total abundance - abundances of the other isotopes
Fractional abundance = 1 - 0.7219
= 0.2781
Now, putting all the values in equation 1, we get
[tex]\text{Average atomic mass}= (55 amu\times 0.2780)+(57 amu\times 0.4439)+(58 amu\times 0.2781)[/tex]
Average atomic mass = 56.7221 amu.
Students asked to measure the temperature of a reaction beaker recorded the following temperatures. 103.7°C, 108.4°C, 105.8°C, 104.6°C The actual temperature is 105.1°C. Which measurement is the most precise? 103.7°C 108.4°C 105.8°C 104.6°C
There are two terms
a) accuracy : it relates to the exactness of an answer that how an answer is close to the actual answer or actual reading
So 104.6 is accurate
b) Precision : This is related to the closeness of different readings with each other
The first reading is 103.7 and the second one is 108.4 so the second reading is quite different from the first reading so it cannot be called as precised
Again 105.8 has good difference from the second reading hence again this is not precised
However the last reading 104.6 is quite near to 105.8 so 104.6 can be called as precise
105.8°C is the most precise measurement.
Explanation:Actual temperature is 105.1°C and recorded values are:
103.7°C108.4°C 105.8°C 104.6°CBy looking at values 105.8C is nearest to actual value. So it is precise one.
What is the concentration of bromide, in ppm, if 115.91 g MgBr2 is dissolved in 1.31 L water.
The concentration of Bromide from 115.91g of MgBr2 dissolved in 1.31L of water would be around 88558.78 parts per million (ppm).
Explanation:The subject of your question is related to the concentration calculation in chemistry, specifically describing the parts per million (ppm) concept using the weight of a solute (MgBr2) and the volume of the solvent (water). The conversion involves the understanding of molarity and the usage of the molecular weight (the weight of one mole). In the case of MgBr2, its molar mass is 184.11 g/mol.
To calculate concentration in ppm, you need to use the following formula: (mass of solute/volume of solution) * 10^6. Here, the mass of the solute (MgBr2) is 115.91g and the volume of the solution is 1.31L. So, (115.91 g / 1.31 l) * 10^6 = 88558.78 ppm approximately.
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After dissolving 115.91g of MgBr2 in 1.31L of water, the resulting concentration of bromide ions would be approximately 76704 ppm.
Explanation:The concentration of a solute in a solution is typically given in parts per million (ppm). The problem at hand is determining the concentration of bromide in a solution formed by dissolving 115.91 g of MgBr2 (magnesium bromide) in 1.31 L of water.
We first need to convert grams of MgBr2 to moles as moles are needed to calculate molarity. The molar mass of MgBr2 is approximately 184.11 g/mol. So, 115.91 g of MgBr2 is equivalent to approximately 0.63 moles of MgBr2.
Recall that MgBr2 will dissociate into Mg2+ and 2 Br- ions in the solution. So, the total moles of Br- in the solution will be 2 * 0.63 mol = 1.26 mol. We can then find the molarity (M) by dividing the total moles of Br- by the volume of the solution in liters. Hence, M = 1.26 mol / 1.31 L = 0.96 M.
Finally, to convert molarity to ppm, we'll multiply by the molar mass of bromide and by a thousand (to account for the definition of ppm). The molar mass of bromide (Br-) is approximately 79.90 g/mol. So, ppm = 0.96 M * 79.90 g/mol * 1000 = 76704 ppm.
Therefore, the concentration of bromide in the solution is 76704 ppm.
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Difference between qualitative and quantitative observations?
In a longitudinal wave, the _________ is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. WILL MARK BRAINLIEST
Final answer:
The wavelength in a longitudinal wave is the distance from one compression to the next compression or from one rarefaction to the next rarefaction.
Explanation:
In a longitudinal wave, the wavelength is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. This is akin to the peak to peak or trough to trough measurement in transverse waves.
Within the cycle of a longitudinal wave, areas of high pressure, or compressions, where the particles are closest together, and areas of low pressure, or rarefactions, where the particles are further apart, alternate regularly. Consequently, the wavelength can be perceived as the spatial period of the wave—the distance over which the wave's shape repeats.
The understanding of these concepts is crucial for analyzing wave behaviors, such as sound propagation, and the impacts of phenomena like the Doppler effect.
Boron has two naturally occurring isotopes: boron -10 (19.8% abundance, mass 10.013 amu ) and born -11 (80.2% abundance, mass of 11.009 amu). What is the average atomic mass of boron? show work please
Hello!
To find the average atomic mass of boron, we need to use this formula:
Average Mass = (mass of isotope #1)(percent abundance) + (mass of isotope #2)(percent abundance) + ...
Before we use the formula, we need to convert the percentages into decimals. Remember that all percentages are out of 100, so, we divide the percent by 100 to get it into decimal form.
19.8 / 100 = 0.198
80.2 / 100 = 0.802
Average Mass = (10.013 amu)(0.198) + (11.009 amu)(0.802)
Average Mass = 1.98 amu + 8.83 amu
Average Mass = 10.81 amu
Therefore, the average atomic mass of boron is 10.81 amu.
10.8 amu is the atomic mass of boron.
Given:
The two isotopes of boron (B).
Boron-10 has an abundance of 19.8% and Boron -11 has an abundance of 80.2%
To find:
The atomic mass of europium.
Solution:
Mass of Boron-10 = 10.013 amu
The percentage abundance of Boron-10 = 19.8%
The fractional abundance of Boron-10 =0.198
Mass of Boron-11 = 11.009 amu
The percentage abundance of Boron-11= 80.2%
The fractional abundance of Boron-11= 0.802
The average atomic mass of Boron = A.M
[tex]A.M=\Sum{\text{Mass of isotope }\times \text{Fractional abundance of isotope}}\\=10.013 amu\times 0.198+ 11.009 amu\times 0.802=10.81 u\approx 10.8amu[/tex]
10.8 amu is the atomic mass of boron.
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What percentage of air is oxygen ?
21% oxygen can i be brainest pls
the percentage of oxygen in the air is 20.95%
nitrogen 78.09%
argon 0.93%
carbon 0.04%
water vapor 1%
A girl is pedaling her bicycle at a velocity of 10 km/hr around town. How far will she travel in two hours?
In 2 hours she traveled 0.2 km
The distance traveled by the girl for the given speed and time is 20 km.
The given parameters;
velocity of the girl, v = 10 km/htime of the her motion, t = 2 hoursThe distance traveled by the girl is the product of the time she spent in the journey and her speed during the journey.
Distance = speed x time
Distance = 10 km/hr x 2 hr
Distance = 20 km
Thus, the distance traveled by the girl for the given speed and time is 20 km.
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Consider the reaction: Cl2(g)+3F2(g)→2ClF3(g) Δ[Cl2]/Δt = -0.099 M/s .Find Δ[F2]/Δt Express your answer to two significant figures and include the appropriate units.
Hey there!
Given the reaction is :
Cl2(g) + 3 F2(g) = 2 ClF3(g)
The rate of a reaction is given by:
Rate = - Δ[Cl2] / Δt
= (-1/3 Δ[F2] / Δt ) + ( 1/2 Δ[ClF3] / Δt )
Given that : Δ[Cl2] / Δt = - 0.099 M/s
From above rate law:
(- Δ[Cl2] / Δt ) = ( -1/3 Δ[F2] / Δt )
( Δ[F2] / Δt ) = 3 * ( Δ[Cl2] / Δt )
= 3 * ( - 0.099 ) = - 0.297 M/s
Therefore:
Δ[F2]/Δt = -0.297 M/s
Hope That helps!
The rate of consumption of fluorine in the reaction has been -0.297 M/s.
The balanced chemical equation for the reaction has been:
[tex]\rm Cl_2\;+\;3\;F_2\;\rightarrow\;2\;ClF_3[/tex]
According to the reaction for the formation of 1 mole of chlorine fluoride, 1 mole of chlorine reacts with 3 moles of fluorine.
The amount of fluoride consumed in unit time has been 3 times the amount of chlorine consumed in the same time.
The [tex]\rm \dfrac{\Delta Cl_2}{\Delta t}[/tex] has been given to be -0.099 M/s.
It states that amount of chlorine consumed in 1 sec = 0.099 M.
The negative sign has been implied with the deduction in the concentration of Cl per second.
The amount of fluorine consumed at the same time has been 3 times the amount of Cl consumed.
Fluorine consumed ([tex]\rm \Delta\;F_2[/tex]) = 3 [tex]\times[/tex] 0.099 M
Fluorine consumed = 0.297 M.
The amount of fluorine consumed ([tex]\rm \Delta\;F_2[/tex]) per second is 0.297 M.
The rate of the depletion of fluorine in the reaction can be given as:
[tex]\rm \dfrac{\Delta\;F_2}{\Delta t}[/tex]= -0.297 M/s.
The rate of consumption of fluorine in the reaction has been -0.297 M/s.
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Which word in the sentence is the predicate adjective? The glowing red coals looked incredibly hot. A. red B. hot C. glowing D. incredibly
The correct answer should be
D: incredibly
Best Answer: d
the subject is who or what you are talking about- the glowing red coals
the predicate is what they are doing- looked incredibly hot
looked is your verb because that is what they are doing, how did they look? they looked hot, that is the adverb. the word that describes hot is incredibly, that is the pred adj. because adjectives describe.
Modern atomic theory states that atoms are neutral. How is this neutrality achieved ? A. Equal number of neutrons and protons B.Equal number of protons and electrons C. More electrons than protons C. More neutrons than electrons
Answer: Option (B) is the correct answer.
Explanation:
An atoms consists of protons, neutrons and electrons. Protons are positively charged, neutrons have no charge and electrons are negatively charged.
Also, when an atom is neutral then there are equal number of protons and electrons.
For example, a neutral sodium atom has 11 protons and 11 electrons.
Therefore, we can conclude that modern atomic theory states that atoms are neutral as they have equal number of protons and electrons.
Which of the following shows a chemical reaction in which silane and oxygen are the reactants and silicon dioxide and water are the products? A. silicon dioxide + water → silane + oxygen B. silane + water → silicon dioxide + oxygen C. oxygen + silicon dioxide → silane + water D. silane + oxygen → silicon dioxide + water
Answer: Option (D) is the correct answer.
Explanation:
When we write a chemical equation then reactants are written on left hand side and products are written on right hand side.
For example, [tex]SiH_{4} + 2O_{2} \rightarrow SiO_{2} + H_{2}O[/tex]
[tex]SiH_{4}[/tex] is the formula of silane. Here, both [tex]SiH_{4}[/tex] and [tex]2O_{2}[/tex] are the reactants. Whereas both [tex]SiO_{2}[/tex] and [tex]H_{2}O[/tex] are the products.
Hence, we can conclude that the chemical equation silane + oxygen [tex]\rightarrow[/tex] silicon dioxide + water, represents a chemical reaction.
Option D correctly represents the chemical reaction where silane and oxygen yield silicon dioxide and water as products.
Explanation:The chemical reaction in which silane and oxygen are the reactants while silicon dioxide and water are the products is represented by option D: silane + oxygen → silicon dioxide + water. This reaction demonstrates the combination of silane (SiH4) with oxygen (O2) to form silicon dioxide (SiO2) and water (H2O), typical of a combusion reaction involving a silane compound. In a similar way, the reaction of cesium oxide react with water results in the formation of cesium hydroxide, and sulfur trioxide reacts with water to produce sulfuric acid, illustrating different chemical behaviors.
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PLZZZZ HELP!!!!!! WILL GIVE BRAINLIEST!!
Select all the signs of a CHEMICAL change from the list below. (You may need to select more than one for full points)
Evaporating
Bubbles (gas formation)
color change
dissolving
The formation of bubbles and a colour change are signs of a chemical change.
One of the substances must have evolved the gas and changed into something else.
One of the substances must have changed into something else with a different colour.
Both above are chemical changes.
Evaporation and dissolving are physical changes, because the substances do not change their chemical structure in the process.
what do you think happens to the air in the collid when ice cream melts ?
The air escapes into the atmosphere.
An emulsion is a colloidal dispersion of one liquid in another liquid in which it does not dissolve.
Ice cream is essentially an emulsion of the fat in milk with a sugar solution trapped in a network of small ice crystals. Other chemicals are added to prevent the emulsion from separating, and air bubbles are mixed into the semisolid mixture.
Up to 50 % of the volume of ice cream can be air.
When the ice cream melts, the air bubbles are no longer trapped. They just escape into the atmosphere.
If you re-freeze the melted ice cream, its volume will be much less than the original.