Answer:
hydrogen
Explanation:
Need help with these three pls!!
Answer:
True True False
Explanation:
Valves are in most veins (to prevent backflow). Also valves in the chart and an in an combustion engine.
So the first statement is True.
Valves control the flow rate and direction of fluid within a closed system. So the second statement is True.
1 Pa = 1 N/m² So since 1 Pa equals to one newton per square metre the third statement is False.
Which is a property of every heterogeneous mixture?
The mixture is made up of at least two different states.
The mixture is made up of something dissolved in a liquid.
The composition of the mixture is the same throughout.
The characteristics of the mixture change within a sample.
Answer:
D.) The characteristics of the mixture change within a sample
Explanation:
Because the guy above me is wrong
Answer:
D.) The characteristics of the mixture change within a sample.
Explanation:
HTH!! Have a good day!!! Don't forget to smile!!!!
PLEASE HELP I WILL GIVE BRAINLEST! what is life about?
Answer:
To live for God.
Explanation:
We are Gods creation. We are here to live for the Lord, to do love& to help save each other so when time comes we will be forever blessed.
Answer:
life is about life I think
Using tongs, place the 250 mL beaker on the hotplate.
Temperature of the water: 65
°C. Reaction time:
seconds
Answer:
first question: temp: 40, time: 26.3
second question: temp: 65, time: 14.2
Explanation:
for edge 2021
A chemist needs 2.00 liters of hydrochloric acid. How many pints is this?
Answer:
4.22675
Explanation:
The _____ of a weak acid is strong.
a. conjugate acid
b. conjugate base
c. acid
d. base
Answer: conjugate base
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
A weak acid has a strong conjugate base whereas a strong acid has a weak conjugate base. Similarly a weak base has a strong conjugate acid whereas a strong base has a weak conjugate acid.
[tex]CH_3COOH+NH_3\rightarrow CH_3COO^-+NH_4^+[/tex]
Acetic acid [tex]CH_3COOH[/tex] is weak acid which has strong conjugate base [tex]CH_3COO^-[/tex]
The pressure of a gas is 1.35 atm at temperature of 21oC. If the volume and amount of gas is unchanged, what pressure would be needed for the temperature to raise to 36oC?
Answer:
2.31 atm
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
How do you convert kilometers to grams
By multiplying the mass value by 1000.
Answer:
Hey!
What you have to do is to multiply the amount of mass * i.e. 67.9g * by 1000 * 67,900kg! *
Explanation:
HOPE THIS HELPS!
An exothermic reaction releases 13,450J of heat. How many calories of energy are released? A) 5 56,274 calories B)1,244 caloriesC) 134,500 caloriesD) 3,215 calories
Answer:
The correct option is;
D) 3,215 calories
Explanation:
Here we are to convert the units of energy
The given units is in Joules, J, while the required units is in calories, where the calorie is defined as the amount of heat required to raise the temperature of 1 gram of water by 1°C
The conversion formula therefore is 1 calorie = 4.1868 J
Hence, 1 J = 1/4.1868 calories
13,450 J = 13,450 × 1/4.1868 calories = 13,450 /4.1868 calories = 3212.477 calories
∴ 13,450 J ≈ 3,215 calories.
PLEASE HELP ;)
Tristan accidentally spilled a substance with an unknown ph on his hands and it burns. Why should he wash his hands immediately with soap and water?
a. the substance spilled on his hand is an acid. The acid in the soap will neutralize the acid to make it stop hurting.
b. The substance spilled on his hand is an acid. The base in the soap will neutralize the acid to make it stop burning.
c. The substance spilled on his hands is a base. The base in the soap will neutralize the acid to make it stop hurting.
d. The substance spilled on his hand is an base. The base in the soap will neutralize the base to make it stop hurting.
Answer:
b. The substance spilled on his hand is an acid. The base in the soap will neutralize the acid to make it stop burning.
Explanation:
In this case, the substance spilled on the hand is an acid, so it will require neutralization. In neutralization reactions, you have an acid and a base, which will be soap. This reaction is known as saponification.
If a gas occupies 22.4 L at 0.265 atm, then what will the pressure be in atmospheres if the gas occupies 35.52 L? Assume all other
variables are held constant
A)0.167 atm
B)0.437 atm
C)0.886 atm
D)149 atm
Answer:
The new pressure is 0.167 atm
The correct answer is option A
Explanation:
Step 1: Data given
Volume of the gas = 22.4 L
Pressure of the gas = 0.265 atm
The volume increases to 35.52 L
Step 2: Calculate the new pressure
P1*V1 = P2*V2
⇒with P1 = the initial pressure = 0.265 atm
⇒with V1 = the initial volume = 22.4 L
⇒with P2 = the new pressure = TO BE DETERMINED
⇒with V2 = the increased volume = 35.52 L
0.265 atm * 22.4 L = P2 * 35.52 L
P2 = (0.265 atm * 22.4 L) / 35.52 L
P2 = 0.167 atm
The new pressure is 0.167 atm
The correct answer is option A
Why do the atoms in a molecule want to be so far apart? (Mention Electron domains/Electrons)
Answer:
Because like chargee repel, two molecules will resist being brought close together.
Explanation:
The shorter the distance is between them, the more energy it takes to push them to get even closer. If the molecules approach each other with sufficient energy, however, they may exchange atoms or even form a bond( chemical reaction)
The temperature of a sample of gas in a steel
tank at 30.0 kPa is increased from -100.0°C to
25.0 °C. What is the final pressure inside the
tank?
A. 5.17 kPa
B. 51.7 kPa
C. 517 kPa
D. 5170 kPa
Answer:
[tex]P_2=51.7kPa[/tex]
Explanation:
Hello,
In this case, we apply the Gay-Lussac's law which allows us to understand the pressure-temperature behavior via a directly proportional relationship:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Thus, since we are asked to compute the final pressure we solve for it in the previous formula, considering the temperature in absolute Kelvin units:
[tex]P_2=\frac{P_1T_2}{T_1}=\frac{30.0kPa*(25.0+273)K}{(-100.0+273)K} \\\\P_2=51.7kPa[/tex]
Best regards.
Answer:
B = Pressure = 51.7kPa
Explanation:
P1 = 30kPa
T1 = -100°C = (-100 + 273.15)K = 173.15K
T2 = 25°C = (25 + 273.15)K = 298.15K
P2 = ?
This question involves the use of pressure (p) law which states that the pressure of a fixed mass of gas is directly proportional to its temperature(t) provided that the volume of the gas is kept constant.
Mathematically,
P = kT, k = P / T
P1 / T1 = P2 / T2 = P3 / T3 =.......= Pn / Tn
P1 / T1 = P2 / T2
Solve for P2,
P2 = (P1 × T2) / T1
P2 = (30 × 298.15) / 173.15
P2 = 8944.5 / 173.15
P2 = 51.66kPa
The pressure of the gas is approximately 51.7kPa
The arrow signifies?
A. Nothing
B. Movement from left to right
C. reaction has occurred
Answer:
The correct answer would be C.
which is correct? not sure which is right
Answer:
butane
Explanation:
Select the correct answer.
Which statement best describes the image?
A.
Ocean temperatures are relatively stable. During the day, the ocean cools the hotter air temperatures above land.
B.
Ocean temperatures are relatively stable. During the night, the ocean heats the cooler air temperatures above land.
C.
Ocean temperatures experience high fluctuations. During the day, the land cools the hotter air temperatures above the ocean.
D.
Ocean temperatures experience high fluctuations. During the night, the land heats the cooler air temperatures above the ocean.
Answer:
C.
Ocean temperatures experience high fluctuations. During the day, the land cools the hotter air temperatures above the ocean.
Explanation:
Generally ocean temperatures range from about -2o to 30o C (28-86o F). The warmest water tends to be surface water in low latitude regions, while the surface water at the poles is obviously much colder
C. Ocean temperatures experience high fluctuations. During the day, the land cools the hotter air temperatures above the ocean.
What is the hottest ocean temperature?The hottest ocean area is in the Persian Gulf, where water temperatures at the surface exceed 90 degrees Fahrenheit in the summer. Another hot area exists in the Red Sea, where a temperature of 132.8 degrees Fahrenheit has been recorded at a depth of about 6,500 feet.
What is a good temperature to swim in the ocean?A little cooler than your body temperature (98.6° Fahrenheit) should not be too cold so that you don't get chilled. 70° to 78° Fahrenheit is the range where most folks feel "comfortable" swimming.
To learn more about Ocean temperatures, refer
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What is a conductor
When electrons move easily though objects
When electrons cannot move easily through objects
When electrons are at rest
Which word equation represents a neutralization reaction? *
base + acid salt + water
base + salt → water + acid
salt + acid base + water
salt + water → acid + base
Answer:
A
Explanation:
Neutralization reaction is
base + acid ---> salt + water.
Which of these defines a volcano?
A. An undersea rift that can cause the ocean floor to move
B. A mountain on Earth's crust through which molten material leaves the mantle
C. A large pile of rocks and other debris that turn into liquid when heated
D. An extremely tall collection of liquid metals that harden when cooled
Answer:
B
Explanation:
pls help Photosynthesis is used to produce food for plants in the form of glucose. In the process, oxygen is released. As shown in the diagram, plants require water and carbon dioxide (from the air). What else is required for photosynthesis and what role does it play? A) Light is required to provide energy for photosynthesis. B) ATP is required as an energy source for photosynthesis. C) Glucose is required as an energy source for photosynthesis D) Oxygen is required to split water molecules in photosynthesis.
Answer:
A) light is required
Explanation:
ATP, Glucose, and oxygen are created from the process
A hydrate is typically a crystalline compound in which water molecules are chemically bound to another compound or an element. When CuSO4⋅ 5H2O is heated in a crucible, there is a loss of water. How should a student determine the amount of water lost?
a.Subtract the mass of the CuSO4 from the mass of CuSO4⋅ 5H2O
b.Subtract the mass of the CuSO4⋅ 5H2O from the mass of CuSO4
c.Add the masses of CuSO4⋅ 5H2O and CuSO4
d.Multiply the masses of CuSO4⋅ 5H2O and CuSO
When CuSO4⋅ 5H2O is heated in a crucible, there is a loss of water. Subtract the mass of the CuSO4⋅ 5H2O from the mass of CuSO4 to determine the amount of water lost. Therefore, option B is correct.
What do you mean by the compound ?A substance made up of two or more components is called a compound. Table salt, water, and carbon dioxide are a few examples of compounds.
Chemical substances have no electrical charge. In most cases, ionic compounds are created when a metal interacts with a nonmetal. The reaction between two nonmetals produces covalent compounds.
Elements are unadulterated substances made up of only one kind of atom. Compounds are substances that are created when two or more different types of elements are chemically combined in predetermined ratios.
To determine the amount of water lost subtract the mass of the CuSO4⋅ 5H2O from the mass of CuSO4.
Thus, option B is correct.
To learn more about the compound, follow the link;
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a. What is the mass in grams of 4.2 mols of FeO2?
According to mole concept, there are 368.928 g mass in 4.2 moles of FeO₂.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles=mass/molar mass
Thus, mass=4.2×87.84=368.928 g.
Thus, there are 368.928 g mass in 4.2 moles of FeO₂.
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Name this compound:
Ca(CO3)
Calcium Carbonate would be your answer!
hope it helps!
The theoretical yield is the amount of product actually produced.
a. True
b. False
Answer:
a. True
Explanation:
Theoretical yield is the amount of product that could be obtained if a chemical reaction has 100% efficiency.
Hope it helps...
What is the oxidation state of Fe(s)
The oxidation state is zero for Fe (s)
Using the diagram of the forces on an airplane, which arrow represents the force of gravity?
A) A
B) B
C) C
D) D
Answer:
Is there a diagram that you can post
Answer:
D
Explanation:
Usatestprep :)
if the volume and Kelvin temperature are reduced by one-half what will happen to the pressure???
Answer:
the pressure will decrease
Explanation:
Ideal gas law is valid only for ideal gas not for vanderwaal gas. The pressure will remain same as the initial pressure on decreasing volume and temperature by half.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. real gas can become ideal gas at low pressure and high temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas =1/2V
n =number of moles of gas
T =temperature of gas =T/2
R = Gas constant = 0.0821 L.atm/K.mol
Substituting all the given values we get
P×(V/2)=nR(T/2)
(PV)/2=(nRT)/2
PV=nRT
Therefore, the pressure will remain same as the initial pressure on decreasing volume and temperature by half.
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How many copper atoms are in 70 grams of copper
2HNO (ag) +
LMg(s) →
Mg(NO3)2(s)
Helg)
155.0-ml of a solution of 0.75 M HNO3 is combined with 270 g of magnesium. What
volume of hydrogen gas will be produced at STP?
Answer:
The volume occupied by the gas is 1.302 × 10⁻³ m³
Explanation:
2HNO₃(aq) + Mg(s) → Mg(NO₃)₂ + H₂(g)
From the above reaction, we have that 2 moles of HNO₃ combine with 1 mole of Mg to produce 1 mole of Mg(NO₃)₂ and 1 mole of H₂
In the question, we have 155.0 mL of a solution of 0.75 M HNO₃ combining with 270 g of magnesium
Therefore, number of moles of HNO₃ = 0.75×155.0/1000 = 0.11625 moles
[tex]Number \, of \, moles \ of \ magnesium = \frac{Mass \ of \, magnesium}{Molar \, mass \ of \, magnesius} = \frac{270}{24.305} = 11.11 \ moles[/tex]
Therefore, HNO₃ is the limiting reaction, hence;
0.11625 moles of HNO₃ will react with 1/2×0.11625 moles or 0.058125 moles of Mg to produce 0.058125 moles of H₂
Hence since we now know the volume of H₂ produce, we can find the volume occupied at STP by the following universal gas equation relationship;
PV = nRT
Therefore;
[tex]V = \frac{n \times R \times T}{P}[/tex]
Where:
V = Volume of occupied by the gas = Required quantity
n = Number of moles = 0.058125 moles
R = Universal gas constant = 8.3145 J/(mol·K)
T = Temperature of the gas at STP = 273.15 K
P = Pressure of the gas at STP = 1 atm = 101325 Pa
[tex]V = \frac{0.058125 \times 8.3145 \times 273.15}{101325} = 1.302 \times 10^{-3} m^3[/tex]
HELPPP TODAY IS THE LAST DAY OF SCHOOL
Answer:
orbiting closer to the earth's surface.....im pretty sure abt it
