Answer:
c.
The high salinity of the surface runoff is harmful to freshwater ecosystems.
Explanation: cause that's the answer
The negative impact of deicing roads with salt on the environment is the high salinity of the surface runoff is harmful to freshwater ecosystems. Therefore, option (C) is correct.
What is deicing?Deicing can be described as the process of removing snow, ice, or frost from a surface. The application of chemicals that not only deice but also remain on a surface to delay the reformation of ice for a certain period of time.
Deicing is accomplished by mechanical methods through the application of heat, various salts or brines, alcohols, glycols, or by a combination of these different techniques.
Deicing of roads has been done with salt, often mixed with sand and gravel, on slick roads. Sodium chloride is generally used, as it is inexpensive and can be available in large quantities.
Since salt water still freezes at −18 °C and also has a tendency to cause corrosion, rusting the steel used in most vehicles. It can be toxic to some plants and animals depending on the concentration of salt.
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Determine the mass of 7.20 moles of iron??
Answer:
[tex]m_{Fe}=4.02x10^{2}gFe[/tex]
Explanation:
Hello!
In this case, since the mole-mass relationships allows us to compute the moles or mass of a sample given the mass or moles via the atomic (elements) or molar mass (compounds). For iron, whose atomic mass is 55.847 g/mol, we can compute the mass o 7.20 moles as shown below:
[tex]m_{Fe}=7.20molFe*\frac{55.847gFe}{1molFe}\\\\m_{Fe}=4.02x10^{2}gFe[/tex]
As you can see we write 1 mol Fe on bottom in order to cancel the given moles out.
Best regards!
When you say that
something is hard to lift, are you talking about
weight or mass?
Answer:
Weight
Explanation:
WHen talking about weight you’re referring to the force exerted to lift if, but when you’re talking about mass it’s just how much it weighs but not how much it takes to lift it.
5 measures in keeping the salon clean and in a safe state
Answer:
Measures in Keeping the Salon Clean and Safe1. All beauty salons must be well-lighted and well-ventilated and must be in good sanitary condition.
2. The salon premises must be free from rodents, vermin, flies or other similar insects.
3. All salon establishments must be provided with continuous running hot and cold water.
4. The curtains and floor coverings in the salon must be washable and kept clean.
5. All hair, used cotton or other waste materials must be removed from the floor immediately, and deposited in a closed container. Get rid of them from the salon premises at frequent intervals.
6. The rest rooms must be well-sanitized and be provided with individual towels.
7. Each beautician must wear a washable uniform while working on clients.
The salon is a place meant for the treatment of hair. Measures have to be taken to ensure that it is kept clean and safe at all times.
The measures that have to be taken in keeping the salon clean and safe are:
The floor must be swept clean at all timesEquipment used must be clean and sterilizedHairdressers and beauticians must wash their hands always before attending to peopleProper ventilation must be maintained at all timesAntiseptic should be used on any wounded skinLearn more here: https://brainly.com/question/18718321
A compound is found to contain 59.94% carbon 13.44% hydrogen and 26.62% oxygen by mass
Answer:
C3H8O
Explanation:
These are the steps:
1. Write the given value for each element.
2. divide them by their Ar.
3. Divide the result by the smallest value in the ratio.
C H O 59.94% 13.44% 26.62% 59.94÷12 13.44÷1 26.62÷16
4.995 13.44 1.664
(4.995÷ 1.664) (13.44÷ 1.664) (1.664÷1.664)
3.00 8.07 1
3 : 8 : 1
So the compound is C3H8O.
How many mg are in 13 grams
[tex]\text {Hi There! Let's Solve this Problem!}[/tex]
[tex]\text {Since we are trying to find how many milligrams (mg) are in 13 grams}[/tex] [tex]\text {we Multiply 1000.}[/tex]
[tex]\text {\underline {Multiply}}[/tex]
[tex]\text {1000*13=}[/tex]
[tex]\text {Your Answer Would Be:}[/tex]
[tex]\fbox {13000}[/tex]
[tex]\text {Best of Luck!}[/tex]
Select the correct set of quantum numbers (n, l, ml) for the third electron removed in the formation of a cation for iron, Fe3+.
Answer:
The third electron to be removed has to be in;
n = 3
l = 2
ml = -2, -1, 0, 1, 2
Explanation:
There are four basic quantum numbers;
i) principal quantum number (n)
ii) Azimuthal, Obital or Subsidiary quantum number (l)
iii) Magnetic quantum number (ml)
iv) Spin quantum number (ms)
The electronic configuration of Fe3+ is:
1s2 2s2 2p6 3s2 3p6 3d5
The third electron to be removed has to be in;
n = 3
l = 2
ml = -2, -1, 0, 1, 2
The third electron removed in the formation of a Fe³⁺ has the quantum numbers:
n: 3l: 2ml: -2Iron has an atomic number of 26, so it has the following electron configuration:
[tex]Fe: [Ar] 4s^{2} 3d^{6}[/tex]
To form cations, it first loses the electrons from the outermost shell (4s). The electron configuration of Fe²⁺ is:
[tex]Fe^{2+} : [Ar] 4s^{0} 3d^{6}[/tex]
Then, it will lose an electron from the highest energy level (3d) to form Fe³⁺.
[tex]Fe^{3+} : [Ar] 4s^{0} 3d^{5}[/tex]
The third electron lost from Fe to form Fe³⁺ was in 3d⁶.
The principal quantum number (n) coincides with the energy level: 3.The azimuthal quantum number (l) corresponding to the sublevel d is 2.The magnetic quantum number (ml) goes from -l to +l. Once each orbital has at least 1 electron (5 electrons), the second electron goes to the orbital with ml = -2.The third electron removed in the formation of a Fe³⁺ has the quantum numbers:
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Convection is transferring thermal energy by
electromagnetic waves
touching/ physical contact
circulation of fluids
none of the above
WHICH IS CORRECT
Answer:
Circulation of fluids
Explanation:
Convection is transferring thermal energy by circulation of fluids
Convection is heat transfer by the movement of currents within a fluid. During convection, heated particles of fluid begin to flow. When a liquid or gas is heated, the particles move faster and spread apart. As a result, the particles of the heated fluid occupy more space.
time equals distance divided by
f a gas has an initial volume of 10L at a temperature of 350K and it is then heated to 680K, what is the new volume?
Answer:
V1 = 10 L
V2 = x L
T1 = 350 K
T2 = 680 K
And you are looking for the second Volume
the image shows the work and the answer is going to be 19.4 L or just 19 L
Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.
What is the ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases.
An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
[tex]V_1[/tex] = 10 L
[tex]V_2[/tex] =?
[tex]T_1[/tex] = 350 K
[tex]T_2[/tex]= 680 K
Now using equation:
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
[tex]\frac{10 L}{350 K} = \frac{V_2}{680 K}\\[/tex]
[tex]V_2[/tex] = 19.4 L
Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.
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4. What is an example of a chemical change that happens inside your body?
a. Food being broken down by enzymes in your stomach b. Food being broken into small pieces by your teeth
c. Food being moved from your esophagus into your stomach
d. Water being absorbed inside your large intestine
Answer: a
Explanation: enzymes are a type of chemical in your body that helps break down food, thus it’s a chemical change in your body.
Food is broken down by the enzymes in the stomach is an example of chemical change happening inside the body. So the correct option is A.
What is digestion?
The process of breakdown down food into its constituent nutrients is defined as the process of digestion. The process of digestion is of two types -
Mechanical digestion: This includes the breakdown of food by mastication performed by teeth. During this process, the food is also mixed with the saliva and a bolus is formed. Chemical digestion: This includes the breakdown of food by the use of enzymes like the saliva present in salivary amylase and the gastric enzymes and intestinal enzymes from the stomach and intestines respectively.Thus, digestion begins in the mouth and both mechanical and chemical digestion takes place in the mouth. In the small intestine, the food is broken down into the smallest constituent nutrients and absorbed into the body.
Therefore the correct option is A.
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Li2SO4 can u break it up pls
g It turns out that (5) 157Gd really, really, REALLY likes capturing a neutron, emitting a gamma. Write the reaction (A a
Answer:
157 64 Gd + 1 0 n -----> 158 64 Gd + γ
Explanation:
In a nuclear reaction, both mass and charge are conserved. If we look at the equation above, we will notice that this principle was followed.
Gama rays has no mass and charge because it is an electromagnetic wave. The relative atomic mass of the isotope of Gd formed in the reaction is 158 Gd. The atomic number remains the same.
1. What is a geologic fold and what causes one to form? 2. What types of forces create a set of folds? 3. What is a monocline? Where are the older rocks found? 4. What is an anticline? Where are the older rocks found? 5. What is a syncline? Where are the older rocks found?
Answer:
Fold, in geology, undulation or waves in the stratified rocks of Earth's crust. Stratified rocks were originally formed from sediments that were deposited in flat horizontal sheets, but in a number of places the strata are no longer horizontal but have been warped. FoldsEdit. When rocks experiencing compressive stress deform plastically, the rocks crumple into folds. Folds are just bends in the rock. You can easily make folds by placing your hands on opposite edges of a piece of cloth and pushing the cloth together. monocline:a bend in rock strata that are otherwise uniformly dipping or horizontal. Bedrock along the northeast coast of Hudson Bay, Canada, has the oldest rock on Earth. Canadian bedrock more than 4 billion years old may be the oldest known section of the Earth's early crust. anticline:a ridge-shaped fold of stratified rock in which the strata slope downward from the crest. syncline:a trough or fold of stratified rock in which the strata slope upward from the axis.
Explanation:
Answer:
1. Fold, in geology, undulation or waves in the stratified rocks of Earth's crust. Stratified rocks were originally formed from sediments that were deposited in flat horizontal sheets, but in a number of places the strata are no longer horizontal but have been warped.
2. FoldsEdit. When rocks experiencing compressive stress deform plastically, the rocks crumple into folds. Folds are just bends in the rock. You can easily make folds by placing your hands on opposite edges of a piece of cloth and pushing the cloth together.
3.a bend in rock strata that are otherwise uniformly dipping or horizontal.
4. a ridge-shaped fold of stratified rock in which the strata slope downward from the crest.
5.In anticlines, as seen on the ground, the oldest rocks are in the center of the fold. In synclines, the youngest rocks are in the center of the fold. This intensely folded limestone from Highland County shows how anticlines and synclines typically occur together. These sharp folds are called "chevron" folds.
Are the cells in your body right now the same exact cells you was born with true or false
Answer:
False
Explanation:
Cells are constantly dying and being reproduced.
Answer:
False.
Explanation:
Your cells are in a constant state of dieing and being replaced by new cells. As a result, very few of the cells in your body now are the exact same cells that you had 20 years ago. Your cells are constantly dying, but they're being replaced with new, fresh cells. ... The average age of a cell is 7 years… but that doesn't mean that every cell is replaced in 7 years. Some cells, in fact, never get replaced at all, remaining with us from birth until death.
Students are given a sample of an unknown material. They want to perform tests to determine its identity. Which test is MOST likely to change the sample into another material?
a
dissolving it in water
b
heating it until it melts
c
heating it until it melts
d
burning it in a flame
Answer: a
. dissolving it in water
Explanation:
When the unknown material is dissolved in water, it could react with the water particles and end up producing another material. For instance an alkali metal in water could form metal oxides.
Heating the material until it melts will not change it into another material because it will still be the same material only now it will be in liquid form. The same logic applies if it is burnt in a flame.
At what pressure would a 0.175 mole sample of gas at 22.0°C have a volume of 2175
mL?
Answer:
[tex]P=1.95atm[/tex]
Explanation:
Hello!
In this case, since we are asked to compute the pressure of 0.175 moles of the given gas at 22.0 °C occupying a volume of 2175 mL, we can use the ideal gas equation as shown below:
[tex]PV=nRT[/tex]
Whereas our unknown is P and we solve for it as shown below:
[tex]P=\frac{nRT}{V}\\ \\P=\frac{0.175mol*0.082\frac{atm*L}{mol*K}*(22.0+273.15)K}{2175mL*\frac{1L}{1000mL} }\\ \\P=1.95atm[/tex]
Take into account that based on the given R units, the temperature must be in Kelvins and the volume in liters.
Best regards!
A horse has been clocked at 90 km/hr. What is its speed in centimeters
per second? USE UNIT CANCELLATIONS AND SHOW ALL WORK.
Answer:
2502 cm/s
Explanation:
In conversions from one unit to another,we always use a conversion factor. A conversion factor is a number used to change one set of units to another, by multiplying or dividing. The conversion factor in changing km/hr to cm/s is:
1 km/hr = 27.8 cm/s.
Hence 90 km/hr = 90 * 27.8 = 2502 cm/s
The inertia of a bowling ball is the inertia of a golf ball.
less than
equal to
greater than
The inertia of a bowling ball is greater than the inertia of a golf ball.
Further explanationIn Newton's first law, it is stated that if the resultant force acts on an object of magnitude is zero, it can be formulated:
[tex]\large{\boxed{\bold{\sum F=0}}[/tex]
then the object tends to defend itself from its state.
or can be stated:
An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.
So for objects in a state of movement, objects tend to move forever. Likewise, for objects in a state of rest, they tend to remain forever. The tendency of objects like this is called inertia
The size of inertia is proportional to mass, the greater the mass of the object, the greater the inertia of the object.
Objects that have more mass will have more ability to maintain their state
So a larger bowling ball mass will have greater inertia than a golf ball
Answer:
greater than
Explanation:
I did this assignment
Please solve the Problems below and round to the correct sig figs:
1. 0.961 - 0.07
2. 0.961 - 0.0700
3. 540.0 X 2.02
4. 540 x 2.02
Answer:
1. 0.891
2. 0.891
3. 1,090.8
4. 1,090.8
Explanation:
What are tides
A. Movements of the Earths water through ocean.
B. The daily rise and fall of the Earth’s water along the shore.
C. The cycling of water through the environment.
Answer: B
Explanation:
A 3.458 g sample of KHP, a monoprotic acid, requires 45.71 mL of a KOH solution to reach the endpoint. What is the concentration of the KOH solution
Answer:
0.3704M is the concentration of KOH
Explanation:
The reaction of the monoprotic acid, KHP, with KOH is:
KHP + KOH → H₂O + K₂P
An acid reacts with a base to produce water and a salt
The molar mass of KHP is 204.22g/mol, that means in 3.458g of KHP you have:
3.458g * (1mol / 204.22g) = 0.01693 moles KHP.
At the endpoint:
Moles KHP = Moles KOH. That means moles KOH Are 0.01693 moles. These moles are in 45.71mL = 0.04571L, the molar concentration is:
0.01693 moles KOH / 0.04571L =
0.3704M is the concentration of KOHThe concentration of the KOH solution needed for the reaction is 0.370 M.
We'll begin by calculating the number of mole in 3.458 g of KHP. This can be obtained as follow:
NOTE:KHP => Potassium hydrogen phthalate
Mass of KHP = 3.458 g
Molar mass of KHP = 204.22 g/mol
Mole of KHP =?Mole = mass / molar mass
Mole of KHP = 3.458 / 204.22
Mole of KHP = 0.0169 mole Next, we shall determine the number of mole of KOH needed to react with 0.0169 mole of KHP. This can be obtained as follow:KHP + KOH → H₂O + K₂P
From the balanced equation above,
1 mole of KHP reacted with 1 mole of KOH.
Therefore,
0.0169 mole of KHP will also react with 0.0169 mole of KOH to the end point.
Finally, we shall determine concentration of the KOH solution. This can be obtained as follow:Mole of KOH = 0.0169 mole
Volume = 45.71 mL = 45.71 / 1000 = 0.04571 L
Concentration of KOH =?Concentration = mole / Volume
Concentration of KOH = 0.0169 / 0.04571
Concentration of KOH = 0.370 MTherefore, the concentration of the KOH solution needed for the reaction is 0.370 M
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i have to turn in this for a test tomorrow!!! i really need it by tomorrow this question is 60 points :) and if you answer it i’m gonna like all of you questions you have answered! p.s click the picture to see it all of the questions are there
Answer:
2. chloroplast
3. cell wall
4. vacuole
5. mitochondrion
6. nucleus
7. lysosome
8. cytoplasm
Explanation:
6. A gas occupies a volume of 125.0 mL at 10.0C. At what temperature would the volume be 50.0 mL?
Answer:
V1= 125.0mL 125.0mL/10.0C=50.0mL/T2
T1= 10.0C T2=(125.0mL/10.0C) X 50.0mL
V2= 50.0mL T2= 625L
T2=?
Explanation:
I'm pretty sure about this It took me a while to get it but I already took the test
HELP ASAP PLEASE :)))
When working with a gas, it is important to know its?
A. volume, shape, mass
B. temperature, pressure, volume
C. pressure and mass
D. temperature, pressure, mass
Bornite is which type of ore?
O iron ore
O bauxite ore
Ouraninite ore
O copper ore
Answer:
O copper ore
Explanation:
Answer:
a rock that contains enough of a metal to be worthwhile to extract
Explanation:
How many grams of a 15.6% sugar solution contain 40.0 g of sugar?
1. Fog is an example of aerosols true or false
Answer:
true?
Explanation:
What is the function of ROM
Answer:
Read only memory (ROM) is non-volatile primary storage. It keeps its contents when the computer is turned off. ROM can be read from but not written to. ROM can be read from but not written to, hence the term read only.
Explanation:
Which is a chemical property of trasistion elements?
A) brightly colored
B) denser than alkali metals
C) great ductility
D) reacts little with oxygen
Answer:
Maybe D? B?
Explanation:
Sorry if I made u get it wrong
Radioisotopes are often used in diagnostic imaging for detecting disease. The isotope 131I (iodine-131), which has a half-life of 8.02 days, is used in nuclear medical imaging. What percentage of the original activity in the sample remains after 17.5 days
Answer: Approximately 22.04% of the original.
Explanation: Radioisotopes, like iodine-131, have unstable nuclei. To become stable, they eject some particle (alpha or beta) or energy (gama).
Half-life is a time for half of the substance to decay. Activity is rate of decay, i.e., the number of decays per unit time.
Half-life and Activity are related by the following:
[tex]A=A_{0}.\frac{1}{2^{n}}[/tex]
where
A is activity
[tex]A_{0}[/tex] is initial activity
n is number of half-lives passed in t
For iodine-131, half-live is 8.02, so in 17.5 it has passed:
[tex]n=\frac{17.5}{8.02}[/tex]
n = 2.182
Final activity will be:
[tex]A=\frac{A_{0}}{2^{2.182}}[/tex]
[tex]A = 0.2204A_{0}[/tex]
Which means after 17.5 days, there were 22.04% of the original iodine-101.
