Climate change, Natural resource use, Waste production, Water pollution, Ocean acidification and Air pollution are the sustainability problems in Canada as well all over the world.
What are the sustainability problems in Canada?Climate change is the major change that occur in Canada because of the extensive use of fossil fuels and the release of other pollutants. This climate change leads to change the precipitation pattern in Canada. The extensive use of natural resource and production of waste material are also serious problems in Canada. Due to waste production, water is polluted because the waste is disposed in the water bodies which leads to acidification of ocean and serious threats to aquatic animals and plants.
So we can conclude that Climate Change, Natural Resource Use, Waste Production, Water Pollution, Ocean Acidification and Air Pollution are the sustainability problems in Canada as well all over the world.
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Forensic scientists use science to find evidence at a crime scene. Which sentence describes how forensic scientists could use observation to determine the time that a crime scene took place?
By looking at the body they can come up with an estimated time of how long it’s been without oxygen(dead).
What are 4 chemistry branches
Answer:
physical, chemistry l, organic chemistry, inorganic chemistry, analytical chemistry and biochemistry
Explanation:
are the 5 primary branches of chemistry
How many total atoms are in 0.310 g of P2O5?
The number of atoms in 0.310 g of P₂O₅ is 6.57 × 10²⁰ atoms.
How to calculate number of atoms?The number of atoms in a substance can be calculated by multiplying the number of moles present in that substance by Avogadro's number as follows:
no of atoms = no of moles × 6.02 × 10²³
According to this question, there are 0.310grams of phosphorus oxide (P₂O₅). The molar mass of P₂O₅ is 283.889 g/mol.
no of moles = 0.310g ÷ 283.889 g/mol
no of moles = 0.00109moles
The number of atoms = 6.02 × 10²³ × 0.00109 moles = 6.57 × 10²⁰ atoms
Therefore, 6.57 × 10²⁰ atoms is the number of atoms in P₂O₅.
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what four elements does halogen bond with?
fluorine, chlorine, bromine, and iodine,
Consider the model of a sodium atom. An orange circle labeled upper n a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. Which feature does the model show accurately?.
Consider the model of a sodium atom. An orange circle labeled upper n a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. The distribution of electrons in different shells feature does the model show accurately.
Sodium is a chemical element with the atomic number 11 and the symbol Na (derived from the Latin natrium). It is a delicate, silvery-white metal that is exceedingly reactive. Due to its placement in group 1 of the periodic table, sodium is an alkali metal. 23Na is the only stable isotope of it.
The periodic table's chemical element sodium has the atom number 11 and the symbol Na (Natrium in Latin). Alkali metals include the soft, waxy, silvery sodium, which is a reactive metal that occurs frequently in natural substances (especially halite).
Alkali metal group (Group 1 [Ia]) element sodium (Na), according to the periodic table. The element sodium is a very delicate silvery-white.
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The complete question is ''Consider the model of a sodium atom. An orange circle labeled upper N a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. Which feature does the model show accurately?
A) the size of the electrons in different shells
B) the shapes of the orbitals in different shells
C)the distribution of electrons in different shells
D)the orientation of the orbitals in different shells
Many types of scientific equipment are used to perform different functions in the science lab which if the following combinations of equipment would be needed to bring one liter of water to 85 c
graduated cylinder, beaker, thermometer and hot plate can be used bring one liter of water to 85 c
graduated cylinder, measuring cylinder or mixing cylinder is the common piece of laboratory equipment that is used to measure the volume of liquid, narrow cylindrical shape and Each marked line on the graduated cylinder represents the amount of liquid that has to been measured- beaker is a glass container with flat bottom which scientists use to hold liquids. ... In Britain, a beaker is a drinking cup mainly used by children, but in the U.S. the word is primarily used to mean a cylindrical glass vessel for mixing, measuring, and pouring liquid chemicals- The thermometer is the instrument used for measuring temperature, sealed glass tube that contains column of liquid.- hot platelearn more about equipments here-
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The actual density of a certain material is 7.48g/cm^3. a student measures the density of the same material as 7.2g/cm^3.what is the percent error of the measurement? answer in units of %
The actual density of a certain material is 7.48g/[tex]cm^{3}[/tex]. a student measures the density of the same material as 7.2g/[tex]cm^{3}[/tex]. the percent error of the measurement is 3.74 %.
Percent Error is defined as difference between experimental value and the theoretical value divided by theoretical value and multiply by 100.
Percent Error =( | experimental value - theoretical value | ) / 100 %
here,
experimental value = 7.2 g/ [tex]cm^{3}[/tex]
theoretical value = 7.48 g/[tex]cm^{3}[/tex]
percent error ( % error) = ( | 7.2 - 7.48 | ) / 7.48 × 100 %
=( 0.28 / 7.48 ) × 100 %
= 3.74 %
Thus,The actual density of a certain material is 7.48g/[tex]cm^{3}[/tex]. a student measures the density of the same material as 7.2g/[tex]cm^{3}[/tex]. the percent error of the measurement is 3.74 %.
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a sample of an organic compound (a nonelectrolyte) weighing 1.35 g lowered the freezing point of 10.0 g of benzene by 3.66 °c. assuming ideal solution behavior, calculate the molar mass of the compound.
A sample of an organic compound (a nonelectrolyte) weighing 1.35 g lowered the freezing point of 10.0 g of benzene by 3.66 °c. assuming ideal solution behavior molar mass of the compound is 189 g mol⁻¹
Here given data is a sample of an organic compound which is nonelectrolyte and weighing of this compound is 1.35 g lowered the freezing point 0.0 g of benzene by 3.66 °c then we have to find molar mass of the compound=?
So here from the given data the freezing point lowering (ΔTf) is known to be 3.66 °C. also, Kf for benzene can be obtained 11.2 means (Kf = 5.12 °C/m). therefore, the equation ΔTf = Kfm can be used to find the molality of the solution. the definition of molality is moles of solute per kilogram of solvent. by using the mass of the solvent, benzene, the number of moles of solute may be found. using this information with the grams of solute, the molar mass of the organic solute may be found
ΔTf = Kfm
3.66 °C = (5.12 °C/m) × m
M=mole of solute/kg solvent=0.715
Molality=0.715 mol solute/kg solvent=0.715 m
0.715 m=x/0.010 kg benzene
Xmol=0.715 × 0.010=7.15×10⁻³mol solute
Mol=g/molar mass
7.15×10⁻³mol solute=1.350g/molar mass
Molar mass= 189 g mol⁻¹
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All chemical reactions obey the law of conservation of mass.
Give
the reason why the reaction between hydrochloric acid and calcium carbonate appears not to show conservation of mass.
The reason the reaction between hydrochloric acid and calcium carbonate appears not to obey the law of conservation of mass is the evolution of carbon dioxide gas.
What is the law of conservation of mass?The law states that in every chemical reaction, the mass of the participating atom is conserved but the atoms themselves can change forms.
Thus, for every atom, the mass before the reaction must also be equal to the mass after the reaction.
So, if two substances A (1 g) and B (1 g) react, the products should weigh: 1 + 1 = 2 g.
Now, in the case of the reaction between hydrochloric acid and calcium carbonate, something happens.
[tex]CaCO_3 + 2HCl -- > CaCl_2 + H_2O + CO_2[/tex]
One of the products formed is carbon dioxide gas. Unless the reaction vessel is sealed, the gas will escape and the weight of the products left will be less that the reactants.
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What are some examples of situations in which gel electrophoresis is used and the types of molecules that scientists separate using the technique.
Answer:
When the molecules are placed in the individual wells they are all at the same distance because al the wells were created with the same comb. Gel electrophoresis is applying an electrical current to separate the molecules. Once gel electrophoresis is ran, the negative dyes will run towards the positive end of the gel and the positive dyes will run towards the negative end of the gel. The heavier dyes will run a shorter distance compared to the lighter dyes, this is how they are separated out.
Explanation:
Answer:
A situation gel electrophoresis is used in DNA fragments like in a crime scene or to distinguish species.
Explanation:
protecting against pathogens that have got into the body A.plasmaB.red blood cellsC.white blood cells
Answer: white blood cells
Explanation: they protect you from illnesses and diseases
Which combination of forces in the table below would allow the rocket to launch?
scientists want to determine whether chemical x, a component of fertilizer, is harmful to fish. they treat fish in the laboratory with increasing amounts of the chemical for one week and then measure their viability. fish that are not treated with chemical x are considered .
The answer would be the prediction for the given experiment of fish.
The question is incomplete and the question is like the fish will die or not.
And anything about the living being we say whether die or not, he/she will or not, or even talking about the weather this all comes under the prediction.
We can only predict the possible terms about the living beings or nature by seeing their present ability or conditions. It all depends on the nature, environment, culture etc.
As a scientist or a chemist , they can easily predict the outcomes of the several experiments.
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A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0°c, the volume of the gas is 371 ml. To what temperature must the gas be heated to occupy a volume of 557 ml?.
A sample of nitrogen gas is contained a piston with a freely moving cylinder in a piston with a freely moving cylinder at 0° C , the volume of the gas 371 ml. the temperature must the gas be heated a volume of 557 ml is 123.091°C
According to the Charles's law,
V1 / T1 = V2 / T2
here,
V1 = 371 ml
V2= 571 ml
T1 = 0°C = 273 K
T2 = ?
putting the values in the formula ,
V1 / T1 = V2 / T2
T2 = ( T1 × V1) / V1
= (273 K) × ( 557 ml) / 371 ml
= 152061 K / 371
= 409.8 K
In °C = 409.8 - 273
136.8 °C
Thus,A sample of nitrogen gas is contained a piston with a freely moving cylinder in a piston with a freely moving cylinder at 0° C , the volume of the gas 371 ml. the temperature must the gas be heated a volume of 557 ml is 136.8 °C.
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2 This question is about atomic structure and bonding. (a) Atoms are made up of protons, neutrons and electrons. Complete the table.
Answer:
Proton (p for positive): Positive +1 charge, relative mass of 1
Neutron (sounds like neutral): no charge, relative mass of 1
Electron (sounds like electric): negative charge, relative mass of 0.0005
volume entering the small intestine: 9,400 ml volume entering the large intestine: 750 ml volume leaving the large intestine: 300 ml what percentage of the water entering the small intestine is absorbed by the small intestine?
The percentage of the water entering the small intestine is absorbed by the small intestine is 92.02%
Calculation of the percentage:Volume of water that is leaving the small intestine should be
= 9400 - 750
=8650 ml
Now the percentage should be
= (8650/ 9400)100
= 92.02 %
Thus 92.02 % of the total water entering the small intestine is absorbed itself by the small intestine.
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How might the government make sure scientific research is done in an ethical
way?
A. By letting public opinion determine what is ethical in scientific
research
B. By taking away research funds if certain ethical standards are not
met
C. By encouraging scientists to perform within their own ideas of
right and wrong
OD. By allowing scientists to do what they think is best
Answer: By taking away research funds if certain standards are not met
PLS HELP ME ON THIS ONE NO ONE SEEMS TO GET IT RIGHT
B. The MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
What is the law of conservation of matter?
The law of conservation of matter states that mass cannot be created nor destroyed, but can be converted from one form to another.
When the law of conservation of matter or mass is applied in a chemical reaction we will observe the following;
the mass of the reactants and mass of products are conservedthe total mass of the reactants is equal to the total mass of the producteach component of the reaction is conservedno new element is createdFrom the given chemical reaction;
2 g of NaCl + 1 g of AgBr = ?AgCl + ? NaBr
Based on the law of conservation of matter, the total mass of the reactants (3 g) must be equal to the total mass of the product (3 g) because matter is conserved.
Thus, the MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
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2.1.4 practice you measure the mass of an apple using a balance. you get these three measurements:
The trials are precise but are not accurate.
The degree to which a measured value approaches a standard or true value is referred to as accuracy. Accuracy is achieved by taking small readings. On the other hand, precision is defined as how closely two or more measurements match one another.
Therefore, accuracy is the degree to which a measurement is near its real value, whereas precision is the degree to which subsequent measurements taken in the same circumstances get the same results.
Now, the three readings obtained by weighing an apple using a balance are trial 1, trial 2, and trial 3.
The mass of the apple during the first trial =167.0g.
The mass of the apple during the second trial =166.9g.
The mass of the apple during the third trial = 167.2g
The true mass of the apple =172g
Therefore, a true mass describes your results in terms of precision and accuracy.
Now, in your three trials to measure the weight of the mass of the apple, your readings replicates were extremely near to each other. As a result, your trials are precise. However, the true mass was 172 g, and if you average your three trials, you would get roughly 167.1 g, which isn't very near to the true mass. As a result, your trials are precise but not accurate.
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You measure the mass of an apple using a balance. You get these three measurements: Trial 1: 167.0 g Trial 2: 166.9 g Trial 3: 167.2 g You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer.
If you add a chunk of zinc to a beaker of acid and zinc shavings to another beaker of acid, the sample with the zinc shavings will react faster. What property causes the increase in rate?.
The property that caused the sample with zinc shavings to react faster than the sample with the chunk of zinc is surface area.
The rate of a reaction is the rate at which reactants form products in a chemical reaction. There are various properties that increase or decrease the rate of reactions, which include temperature, catalyst, surface area and nature of the reaction.
In the question above, the main property that increased the rate of the reaction is surface area. Surface area is the amount of a solid reactant that is exposed. The more the surface area exposed, the faster the reaction.
The beaker of acid with the chunk of zinc is slower, because the zinc has less of its surface area exposed to the acid. In the second sample, reaction takes place on each of the zinc shavings, which will increase the rate at which products are going to form.
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This is a solid that is formed during
a chemical reaction, typically in
solution.
Precipitate refers to a solid that develops from solution during a chemical process.
What kind of solid results from a chemical reaction in a solution?A solid that is distinct from any of the reactants is referred to as a precipitate. An insoluble product may arise when solutions containing ionic chemicals are combined.
Combination, disintegration, solitary, dual, and combustion are the five fundamental kinds of chemical processes. You may classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.
When pieces of two ionic compounds are swapped, creating two new compounds, this reaction is known as a double replacement reaction (also known as a double displacement, swap, or metathesis reaction).
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How many atoms are in 2.4 g of uranium?
The number of atoms in 2.4 g of uranium is 6.07×10²¹ atoms
Avogadro's hypothesis1 mole of Uranium = 6.02×10²³ atoms
But
1 mole of Uranium = 238 g
Thus,
238 g of Uranium = 6.02×10²³ atoms
How to determine the numbber of atoms in 2.4 g of uraniumWe can obtain the numbber of atoms in 2.4 g of uranium as illustrated below:
238 g of Uranium = 6.02×10²³ atoms
Therefore,
2.4 g of Uranium = (2.4 g × 6.02×10²³ atoms) / 238 g
2.4 g of Uranium = 6.07×10²¹ atoms
Thus, we can conclude that 6.07×10²¹ atoms are present in 2.4 g of Uranium
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Where do red pandas live?
A - in the Himalayan mountains range in souther Asia
B - in the Andes mountain range in South America
C - in the Amazon rainforest in Brazil
D - in the Nile River Delta in lower Egypt.
Answer:
Red pandas live in the Eastern Himalayas in places like China, Nepal, and Bhutan . They spend most of their time in trees. Their semi-retractable claws help them move easily from branch to branch.
Explanation:
my answer would be A
2. Conduction occurs best in metals because they have a high
The correct answer is when electrons bump into atoms and other electrons.
Because of how tightly packed their particles are, metals are particularly good heat conductors because vibrations are transferred very fast. Additionally, they have a lot of free electrons.
Metals get their strength and other qualities from these when they gently float through the framework. The free electrons that are nearest to the heat source are heated as the metal warms up. As a result, they move more quickly through the metal, crashing into other electrons as well as atoms. They naturally vibrate more quickly as a result (or move through the metal faster in the case of collisions with other free electrons). As a result, the metal swiftly dissipates the heat.
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Why is the ph of a 0. 1 m solution of acetic acid in water higher than that of a 0. 1 m solution of hcl in water?.
The pH of a 0.1 M solution of acetic acid in water is higher than that of a 0.1 M solution of HCl in water because the acetic acid does not fully ionizes in water but HCl completely ionizes in water.
Acetic acid being a weak electrolyte, does not completely dissociates in water. So regardless of the concentration of acetic acid, the pH of 0.1 M acetic acid is higher.
CH₃COOH + H₂O → CH₃COO⁻ + H₃O⁺
HCl is a strong acid which dissociates into H⁺ and Cl⁻ ions in the water. In aqueous, the H⁺ joins a water molecule to form a hydronium ion, H₃O⁺.
HCl + H₂O → H₃O⁺ + Cl⁻
As pH = -log [H⁺], therefore lesser the [H⁺], greater will be the pH. HCl gives more H⁺ than acetic acid, therefore, pH of acetic acid is higher than HCl.
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Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18. 5 g of calcium nitrite in 83. 5 g of distilled water?.
The molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water is 1.677m.
Molality is defined as the ratio between the amount of solute in a solution and the mass of corresponding solvent in the solution.
m = moles of solute/mass of solvent(kg)
If we have 18.5 g of calcium nitrite, using the formula for molar mass, solve for its number of moles.
n = mass/MM
moles of solute = 18.5 g calcium nitrite / 132.089 g/mol
moles of solute = 0.1400570827 moles calcium nitrite
Using the formula for molality, solve the molality of solution prepared by dissolving 0.1400570827 moles calcium nitrite in 83.5 g of distilled water.
m = moles of solute/mass of solvent(kg)
m = 0.1400570827 moles calcium nitrite / 83.5 g(1kg/1000g)
m = 0.1400570827 moles calcium nitrite / 0.0835 kg
m = 1.677330332
m = 1.677
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You find a puddle of a clear, colourless liquid on your driveway. It is either
water, gasoline, or spilled battery acid from the car. How can you safely
test the liquid to determine its identity? Explain how you can interpret
your observations.
Adding baking soda to vinegar or battery acid will bubble, but not water. If the liquid fizzles, waft your fingers over it to smell it; battery acid does not smell like vinegar. Fizzing is battery acid, not vinegar.
This is further explained below.
How can you safely test the liquid to determine its identity?Generally, A little amount of baking soda might be sprinkled on top of the liquid; if the liquid is vinegar or battery acid, it will fizz, however, water will not.
In conclusion, Whether it fizzles, or wafting your fingers over the liquid to obtain a scent of it might help you discern if it has the smell of vinegar; battery acid does not smell like vinegar.
If it fizzles, however, it is not vinegar; it is the smell of battery acid.
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Given 50g and 27ml find density
Answer:
1.85g per cubic centimeter (g/cm3
Explanation:
because density=mass/volume, so it will be 50g divide by 27ml =. 1.85g/cm3
The reaction of cr2o3 with silicon metal at high temperatures will make chromium metal. True or false?.
False
Pure chromium is produced either by the thermal reduction of Cr2O3 with aluminum or by the electrolysis of trivalent chromium solutions... Not Silicon
Question
Complete the calculation to find the mass of 1 mole of water (H₂O). Use the atomic weights given in the periodic table.
Select the correct option from each drop-down menu.
2x(
g/mol) +1x(
g/mol) =
g/mol
The correct answer is 18.01468 g/mole
1)Atomic mass calculates the mass of the atom.
The atomic mass is defined as the 1/12 mass of a carbon-12 atom in its ground state.The atomic mass is expressed in = amu1 amu = 1.67 x 10^-24 grams.The atoms mass is the sum of mass of protons and neutrons.If the two elements having same atomic that means they are isotopes of each other. H20 = H2 + O2since the hydrogen gas is an element and oxygen gas is an element so we calculated atomic number of both the elements and then added .2) The mass of one mole of water is equals to the atomic/ molecular mass in grams.
Atomic mass of H2O = 2×(H)+1×(O) g/molatomic mass of hydrogen is = 2×(1.00784 g/mol)+1×(15.999g/mol)= 2.01568 + 15.999 g/mol
=18.01468 g/mol
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