Answer: 50N forward
Explanation:
A woman is pushing a cart 125N forward (+125N)
Gravity is pushing 50N backwards (-50N)
A child is pushing 25N backwards (-25N)
The net force is the total sum of these forces.
125N+(-50N)+(-25N)
125N-50N-25N
125N-75N
50N forward because it's positive
Answer:
Explanation: A woman is pushing a cart 125N forward (+125N)
Gravity is pushing 50N backwards (-50N)
A child is pushing 25N backwards (-25N)
The net force is the total sum of these forces.
125N+(-50N)+(-25N)
125N-50N-25N
125N-75N
50N forward because it's positive
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]
The arrow signifies?
A. Nothing
B. Movement from left to right
C. reaction has occurred
Answer:
The correct answer would be C.
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
What is the density. In grams per mililiter (g/mL), of a substance with a mass of 50 grams and a volume of 100 ml? (The substance is shown below.)
2.0 ml
50.000 ml
05/ml
5.000/ml
PLEASE HELP
Answer:5.000/ml
Explanation:
please help, thank you:))
Explanation:
15 8 O ---> 15 7 N + 0 1 e
Element: Oxygen
Mass Number: 16 u
Decay: Beta
238 92 U ----> 234 90 Th + -4 -2 e
Element: Uranium
Mass Number: 238.051 u
Decay: Alpha
if the force between two charged particles increases,but the distance between them does not change, then:
Answer:
The attraction and repulsion gets slowly weaker
Explanation:
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.
HELPPP TODAY IS THE LAST DAY OF SCHOOL
Answer:
orbiting closer to the earth's surface.....im pretty sure abt it
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
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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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 the molarity of an HCl solution if 125 mL is neutralized in a titration by 76.0 mL of 1.22 M KOH?
Answer:
0.74176 M HCl
Explanation:
1) Write out a balanced equation.
KOH + HCl --> KCl + H2O
2) Calculate #mol KOH in 76.0mL needed for the titration.
1.22 mol KOH in 1000mL
x mol KOH in 76.0mL
x = 0.09272 mol KOH
3) Use the balanced equation ratio (from step 1), 1 mol KOH : 1 mol HCl.
0.09272 mol KOH = 0.09272 mol HCl
4) 125mL of the HCl solution was used for the titration, so find the molarity.
0.09272 mol HCl is in 125mL
x mol HCl in 1000mL
x = 0.74176 mol HCL / 1 L
SO... 0.74176 M HCl is the answer.
*hope this helped*
- A Kind Stranger
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.
anybody know where to find this packet at online ?
What is a conductor
When electrons move easily though objects
When electrons cannot move easily through objects
When electrons are at rest
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.
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This group of fungi has reproductive cells with flagella so that they can swim
Answer:
The answer would be chytrids.
Chytridiomycota (chytrids) is a group of fungi that has reproductive cells with flagella so that they can swim.
What is Chytridiomycota?The fungus known as the amphibian chytrid fungus only infects frogs. A frog uses its skin to maintain homeostasis. The chytrid fungus ruins the frog's ability to swallow, exchange ions, and function normally when it affects its skin.
The fungus targets the keratin-containing areas of a frog's skin. Frogs have trouble breathing because they use their skin for respiration.
As a class of fungi, chytrids are regarded as the most basic. They are primarily aquatic, and the only fungus cells known to contain flagella are those of the gametes. They can reproduce asexually or sexually; the latter method produces zoospores.
Therefore, a class of fungi known as chytrids possesses reproductive cells with flagella that allow them to swim.
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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.
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...
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.
Use the information below, to write a word equation, then change it into a balanced symbol equation.
1) Magnesium reacts with Hydrochloric acid to make magnesium chloride and hydrogen gas
Answer:
Mg + 2HCl -> MgCl2 + H2
Explanation:
Which of the following would produce the most ions when dissolved in water?
sodium chloride
mangesium chloride
aluminum oxide
sugar
Answer:
Aluminum oxide
Explanation:
The solubility of each of the species is shown below;
Sodium chloride: NaCl(s) ------> Na^+(aq) + Cl^-(aq)
Magnesium chloride: MgCl2(s)-----> Mg^2+(aq) + 2Cl^-(aq)
Aluminum Oxide: Al2O3(s) ------> 2Al^3+(aq) + 3O^2-(aq)
Sugar: Not ionic in nature hence it doesn't produce any ions.
We can see that Al2O3 produces five ions in solution. This is the specie that produces the greatest number of ions among all the species listed among the options. Hence we can safely conclude that aluminum oxide is the specie that produces the greatest number of ions in solution among all the options listed in the question.
Answer:
solid ice, when heated, turning into liquid water
Explanation:
solid ice, when heated, turning into liquid water
Name this compound:
Ca(CO3)
Calcium Carbonate would be your answer!
hope it helps!
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 could you test each molecule to
determine if it was DNA or RNA?
Answer:
Nucleobases should be checked. RNA contains adenine, guanine, cytosine and uracil instead of thymine, so if we isolate uracil, it means that it is RNA, if not, then is DNA.
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!!!!
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:
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 :)
How many moles of O2 can be produced from 1.7 moles of KClO3?
Answer:
2.55 moles
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
What is the difference between a haploid species and a diploid species?
Answer:
Diploid refers to the number of whole chromosome sets present in every cell of an organism: diploid cells contain entire sets. Haploid organisms, only include one complete chromosome set.
Answer:
Haploid species have only one set of complete chromosomes. Diploid species have two sets of complete chromosomes. Haploid cells are created by meiosis, where the diploid cell will divide in half. Two haploids merge by fertilization. Diploid cells reproduce by mitosis making daughter cells that are exact replicas.
Explanation:
examples of haploid are cells (gamate) sperm and ovate
examples of diploid are skin cells, blood cells
