In calculating the mean donation amount, which steps would you need to take? Check all that apply.
A)Multiply each donation amount by the number of people. B)Add the total amount of money. C)Add the total number of people D)2,550 ÷ 25 = $102 E)25 ÷ 2,550 = $0.01
Answer:
A,B,C,D
Explanation:
I just took the test
Answer:
Its
A: Multiply each donation amount by the number of people.
B: Add the total amount of money.
C: Add the total number of people.
D: 2,550 ÷ 25 = $102
Explanation:
Edg2020
state two differences between metals and non metals with respect to their
1 physical properties
2 chemical properties
Answer:
Physical Properties
1. Metals are shiny but most non - metals lack this property.
2. Metals are able to deform under compression (malleable) but most non - metals lack this property.
Chemical Properties
1. Metals are good conductorsof heat and electricity but most non - metals are insulators.
2. Metals, when exposed to water atmospheric oxygen tend to rust but non - metals lack this chemical property
define galvanization
Answer:
Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten hot zinc.
PLEASE HELP WILL GIVE BRAINLIEST ANSWER!
58.5 grams of NaCl is dissolved in 0.5 liters of water. The molarity of the solution is _____.
b. 2 M
c. 29.25 M
d. 117 M
58.5 grams of NaCl is dissolved in 0.5 liters of water, then the molarity of the solution is 2M.
What is molarity?Molarity of any solution is define as the number of moles of solute present in per liter of solution and it is represented as:
M = n/V, where
V = volume of solution = 0.5 L
n is moles and will be calculated as:
n = W/M, where
W = given mass of NaCl = 58.5g
M = molar mass of NaCl = 58.44 g/mol
n = 58.5/58.44 = 1 mole
Molarity will be represented as:
M = 1/0.5 = 2 M
Hence required molarity of NaCl is 2M.
To know more about molarity, visit the below link:
https://brainly.com/question/26528084
What is the molarity of 10g of carbon in a 500L solution?
Answer:
Molarity is the number of moles in a liter of a substance.
Molarity= Mole/volume
Mass= 10g
Molar mass of Carbon=12g
To calculate the mole we use the formula: mole= mass/molar mass
Mole = 10g/12g
Mole = 0.83
Molarity= 0.83/500 =0.0017moles per liter
7 points
How many Hydrogen atoms are found on the REACTANT side of the
chemical equation below?
P4010+H2O----->H3PO4
O 3
O 2
O 10
O 4
Answer: 12 ( answer not among the option)
Explanation:
From the equation of reaction; P4O10+ H2O -----> H3PO4, it is unbalanced.
One can only get the exact number of ''Hydrogen atom'' if it is well balanced.
Adding '4' to H3PO4 on the RHS and '6' to H2O on LHS of the equation would give a balanced equation such as;
P4O10 + 6H2O -----> 4 H3PO4
Therefore the number of hydrogen atoms found on the reactant is 12.
Using the stars as an example explain how nuclear fusion works
What is the molarity of a solution formed by dissolving 100 g of Ca(No3)2 and 450 mL of solution
Answer:
1.35 M
Explanation:
grams/molar mass=ans./volume(L)
100/164=ans./.450
If a compound contains an anion which is the conjugate base of a weak acid, the addition of hydronium ion solubility does what ?
Answer:
The addition of hydronium ion increases the solubility of the salt
Explanation:
When a weak acid, MA dissociates in an aqueous solution, the following products in equilibrium are obtained;
MA ----> M+ + A-
The anion which is a conjugate base will be removed from the solution with the addition of a hydronium ion from an acid: 2H3O+ + 2A- ----> 2HA + 2H20
This distorts the reaction equilibrium. According to Le Chatelier’s principle, more MA will dissolve until in order to restore the previous equilibrium of the reaction.
Therefore, an acidic pH increases the solubility of almost all sparingly soluble salts whose anion is the conjugate base of a weak acid.
You complete a titration and find that you need 2.5 mL of a 0.1M NaOH to neutralize 250 mL of
the river water.
How many moles of NaOH did you use to neutralize the river water?
Answer:
0.00025 mole
Explanation:
The number of moles of a substance can be mathematically derived from the following formula
1. mass of substance (in grams)/molar mass of substance (in grams/mole)
2. molarity of substance (in mol/dm3) x volume of substance (in dm3)
In this case, the molarity and volume of NaOH are provided, hence, the second formula will be applicable.
2.5 mL of NaOH was used = 0.0025 dm3
Number of mole of NaOH that was used to neutralize the river water:
= 0.1 x 0.0025 = 0.00025 mole
The number of mole of NaOH used to neutralize the river water is 0.00025 mole.
the kind of friction that shows a falling object is it gravity, free fall
Answer:
It's called air resistance.
Explanation:
While it may seem hard to believe at first, all objects in free fall accelerate at the same rate regardless of their masses. Objects falling through air experience a type of fluid friction called air resistance.
What is activation energy
Answer:
Activation energy is the energy that's provided to a chemical or nuclear system, whichever one, with reactants to get a result of a chemical reaction or a nuclear, or many other reactions. Well that's what I know, I tried(:
Explanation
Well that's what I know, I tried(:
the amount of matter in an object is called
Answer: Matter
Explanation:
Matter is anything that has volume and/or mass.
what is the main cause for global wind patterns?
A) currents in the ocean affect the air above it
B) unequal heating of different parts of earth
C) differences in elevation on different landmasses
D) greenhouse gases
(no guessing please )
Consider the chemical equations shown here.
P4(s)+3O2(g)--->P4O6(s) ΔH1 = -1,640.1 kJ
P4O10(s) → P4(s) + 5O2(g) ΔH2 = 2,940.1 kJ
What is the overall enthalpy of reaction for the equation shown below?
Round the answer to the nearest whole number.
P4O6(s) + 2O2(g) --->P4O10(s)
Answer:
-1300. kJ
Explanation:
We have two equations:
1. P₄(s) +3O₂(g) ⟶ P₄O₆(s); ΔH₁ = -1640.1 kJ
2. P₄O₁₀(s) ⟶ P₄(s) + 5O₂(g); ΔH₂ = 2940.1 kJ
From these, we must devise the target equation:
3. P₄O₆(s) + 2O₂(g) ⟶ P₄O₁₀(s); ΔH = ?
The target equation has P₄O₆(s) on the left, so you reverse Equation 1.
When you reverse an equation, you reverse the sign of its ΔH.
4. P₄O₆(s) ⟶ P₄(s) +3O₂(g); ΔH₁ = 1640.1 kJ
Equation 4 has P₄ on the right. That is not in the target equation.
You need an equation with P₄ on the left, so you reverse Equation 2.
5. P₄(s) + 5O₂(g) ⟶ P₄O₁₀(s); ΔH₂ = -2940.1 kJ
Now, you add equations 4 and 5, cancelling species that appear on opposite sides of the reaction arrows.
When you add equations, you add their ΔH values.
You get the target equation 3:
4. P₄O₆(s) ⟶ P₄(s) + 3O₂(g); ΔH₁ = 1640.1 kJ
5. P₄(s) + 2(5)O₂(g) ⟶ P₄O₁₀(s); ΔH₂ = -2940.1 kJ
3. P₄O₆(s) + 2O₂(g) ⟶ P₄O₁₀(s); ΔH = -1300. kJ
ΔH for the reaction is -1300. kJ
Why is 1-methylhexane not a legitimate name for a compound?
Answer:
It is not a legitimate chemical name because the methyl group on carbon 1 increases the length of the carbon chain to seven carbon atoms thus making the parent compound heptane
Explanation:
Chemical compounds are named according to rules in the IUPAC nomenclature.
In naming organic compounds, parts of rules is to find out the parent or root compound. This is determined by finding out the longest carbon chain and then checking if it contains single or multiple bonds. (that is if it is an alkane- with single bonds, alkene-with double bonds or an alkyne- with triple bonds)
From the question the parent or root name is an alkane containing 6 (Hex-) carbon atoms, while the methyl group is substituent
(CH₃)-CH₂-CH₂-CH₂-CH₂-CH-CH₃
However the alkyl substituent on carbon 1 increases the the length of the carbon chain to 7 (Hept-) instead of 6. Hence the correct IUPAC nomenclature is heptane and not 1-methylhexane.
Mixtures are made up of what substances.
Answer:
Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Answer:
It would depend on the mixture to determine what the mixture is.
Explanation:
If you don't know what the mixture is then you wont be able to find what substances, since their could be many components.
how does a runoff get polluted.
Answer:
any litter on the ground can be swept up into the runoff. dirty ground water also commonly affects runoff since there are so many chemicals in the ground. farmers especially need to be cautious because teir fertilizers can leak into the ground.
Answer:
Water is polluted by runoff through the action of erosion: removal of surface material from Earth's crust, primarily soil and rock debris from the environment of which the water flows through.
Explanation:
When rain falls onto the earth, it just doesn't sit there, it starts moving according to the laws of gravity. A portion of the precipitation seeps into the ground to replenish Earth's groundwater. Most of it flows downhill as runoff. Runoff is extremely important in that not only does it keep rivers and lakes full of water, but it also changes the landscape by the action of erosion. Flowing water has tremendous power—it can move boulders and carve out canyons; check out the Grand Canyon!
Runoff of course occurs during storms, and much more water flows in rivers (and as runoff) during storms. For example, in 2001 during a major storm at Peachtree Creek in Atlanta, Georgia, the amount of water that flowed in the river in one day was 7 percent of all the streamflow for the year.
Examples
1. That part of the precipitation, snow melt, or irrigation water that appears in uncontrolled (not regulated by a dam upstream) surface streams, rivers, drains or sewers. Runoff may be classified according to speed of appearance after rainfall or melting snow as direct runoff or base runoff, and according to source as surface runoff, storm interflow, or groundwater runoff.
2. The sum of total discharges described in (1), above, during a specified period of time.
3. The depth to which a watershed (drainage area) would be covered if all of the runoff for a given period of time were uniformly distributed over it.
How many moles of sodium chloride are required to prepare 500.0 mL of a 0.100 M solution?
Molarity=Moles/Liter
0.1M solution=x moles NaCl/0.5L (since 1000mL is one liter)
Multiply both sides by 0.5 to isolate the variable x
x=0.05 moles of NaCl is needed to maintain that molarity.
Answer:
0.0500 mol
Explanation:
0.100 M solution means that 0.100 mol of NaCl are in 1L=1000 mL solution.
(0.100 mol/1000 mL) * 500 mL = 0.0500 mol
A scuba tank contains a mixture of oxygen (O2) and nitrogen (N2) gas. The oxygen has a partial pressure of PO2=5.62MPa. The total gas pressure is 26.78 MPa. What is the partial pressure of nitrogen gas in the tank?
Answer:
21.16 MPa
Explanation:
Partial pressure of oxygen = 5.62 MPa
Total gas pressure = 26.78 MPa
But
Total pressure of the gas= sum of partial pressures of all the constituent gases in the system.
This implies that;
Total pressure of the system = partial pressure of nitrogen + partial pressure of oxygen
Hence partial pressure of nitrogen=
Total pressure of the system - partial pressure of oxygen
Therefore;
Partial pressure of nitrogen= 26.78 - 5.62
Partial pressure of nitrogen = 21.16 MPa
Answer:
The partial pressure of Nitrogen gas in the tank = 21.16 MPa.
Explanation:
According to Dalton's Law of partial pressure for gases, the total pressure of a mixture of gas under unchanging conditions is a sum of the partial pressures of each of the individual constituent gas.
The mixture consists of Nitrogen and oxygen gas. Hence, mathematically,
Total Pressure of the mixture = (Partial Pressure of Oxygen gas) + (Partial Pressure of Nitrogen gas)
Total Pressure of the mixture = 26.78 MPa.
Partial Pressure of Oxygen gas = 5.62 MPa.
Partial Pressure of Nitrogen gas = ?
26.78 = 5.62 + (Partial Pressure of Nitrogen gas)
Partial Pressure of Nitrogen gas = 26.78 - 5.62 = 21.16 MPa.
Hope this Helps!!!
Which example is not a structural adaptation of animals?
NEED HELP ASAP
A. a tortoise shell to protect from predators
B. wings on a bird to get food and escape predators
C. a seal's thick fat to keep it from freezing
D. gosling following their mother to stay protected
Describe how to do a flame test on a sample of a salt
Answer:Hope this helps!
Explanation:
You can use a flame test to help identify the composition of a sample. The test is used to identify metal ions (and certain other ions) based on the characteristic emission spectrum of the elements. The test is performed by dipping a wire or wooden splint into a sample solution or coating it with the powdered metal salt. The color of a gas flame is observed as the sample is heated. If a wooden splint is used, it's necessary to wave the sample through the flame to avoid setting the wood on fire. The color of the flame is compared against the flame colors known to be associated with the metals.
the attraction between two oppositely charged atoms or group of atoms is which type of bond
Answer:
ionic bond
An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
This Venn diagram is used to compare the products and reactants of a reaction of baking soda and vinegar. What could be put into the intersection? Precipitates Chemical compounds Solid compounds Gases
I think and I'm sure it is gases
Answer:
gasses
Explanation:
i took the quiz
A sample of gas at 313 K and 4.95 atm occupies 85.62 L of space. Which
variable is the volume (V)? (Note: You are not solving the problem, just
choose the correct variable.)
Answer: 85.62 L represents volume (V).
Explanation:
Volume is defined as the amount or quantity of a given substance or an object.
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 4.95 atm
V = Volume of gas = 85.62 L
n = number of moles
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]313K[/tex]
Thus 85.62 L represents volume (V).
Molar mass of Fe2O3 = g/mol
Answer:
159.6882 grams
Explanation:
In a solid to liquid mixture and increase in temperature means?
Answer:
Increase in temperature will not affect a solid - liquid mixture. Example can be taken of salt and water
Some processes for making coffee leave tiny particles of ground coffee beans suspended in the coffee when it is served. Can these particles be considered a solute if they are evenly distributed throughout the cup of coffee? Explain.
Answer:
b
Explanation:
the force that one surface exerts on another when the two rub against each other is called _
Answer:
friction
Explanation:
Which of these is a disadvantage of using natural gas A It is not considered safe to use in homes. B Scientists have developed new ways of extracting it C It burns less cleanly than other fossil fuels D Extraction through fracking can contaminate groundwater
Answer:
A
Explanation:
Natural gas is flammable. A natural gas leak in a house can cause potential fires, and inhaling the gas can cause natural gas poisoning.
* Answer B: The fact that scientists have developed new ways of extracting natural gas - is an advantage, not a disadvantage.
* Answer C is wrong, because compared with some other fossil fuels, natural gas emits the least amount of carbon dioxide into the air when combusted -- making natural gas the cleanest burning fossil fuel of all.
* Answer D: the content of the statement is about the production process, not about using of natural gas.
....
Hope this answer can help you. Have a nice day!
Answer:
Explanation:D Extraction through fracking can contaminate groundwater