Answer: 55? I think
Explanation:
Two blocks of platinum have a temperature of 200 Celsius one block has a mass of 10g the other block has a mass of 100g do the blocks have the same amount of thermal energy?
Two blocks of platinum have a temperature of 200 Celsius. Both the blocks have the same amount of thermal energy because both are metals which conducts heat energy throughout their bodies.
What is conduction?Conduction is the process by which heat energy is transmitted between neighboring atoms or molecules. We know that metals are the good conductors of heat and electricity so if one part absorb heat, it will spread to the whole body so we can conclude that the thermal energy will remain the same amount throughout the whole body.
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PLS HURRYThe moon does not light up by itself. Instead, it reflects light from the sun. Question 10 options: True False
Answer:
awnser is true took the test
Explanation:
i took the test
What is the net ionic equation for potassium fluoride and ammonium chloride
The net ionic equation for potassium fluoride and ammonium chloride is
NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)
What is the net ionic equation for potassium fluoride and ammonium chloride?Generally, The net ionic equation can simply be defined as a chemical equation that records solely those species experiencing the reaction.
Therefore, net ionic equation for potassium fluoride and ammonium chloride
NH_4Cl(aq) and KF(aq) are both salys
Therefore, the ionic equation excludes them and is
NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)
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hello people ~
polymer is a large molecule composed of many repeated units. What is a polyester composed of?
A. Ether
B. Cellulose
C. Amino acids
D. Ester
Answer:
D. Ester
Polyesters are defined as (snooze alert!) long-chain polymers chemically composed of at least 85 percent by weight of an ester and a di-hydric alcohol and a terephthalic acid. The term refers to many (poly) esters (the building block compound—many fats and fragrances are esters).
Manufactured cellulose fibers come from plants that are processed into a pulp and then extruded in the same ways that synthetic fibers like polyester or nylon are made. Rayon or viscose is one of the most common "manufactured" cellulose fibers, and it can be made from wood pulp.
Helppppppppppppppppppppppppppppppppppppppppppp
what is ammonia Conductivity in Solution?
a. Light bulb shines brightly
b. Light bulb shines dimly
c. Light bulb shines doesn't shine
and explain why you chose that answer
Answer:
B.
Explanation:
An ammonia solution contains only a few ions, and it conducts electricity only poorly.
PLEASE ANSWER!!! TIME LIMITED!!! What are 2 ways electric motors and electric generators are alike?
A. They each transform mechanical energy into electrical energy.
B. They each use an electromagnet.
C. They each include an electrical circuit.
D. They each use a battery as their main power source.
Answer:b
Explanation:
Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.
Answer:
A
and B
Explanation: hope this helps, pls mark brainliest.
A State of Matter with No fixed Shape and
No fixed Volume
The two basic properties of all matter are ______ and ______.
options for first blank
a. length B. volume
options for second blank
a. density B. mass
Answer:A-density and B-mass is the answer.
Explanation:
Answer:
1.) Density
2.) Mass
Explanation:
A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh? a. 73.30 g b. 274.49 g c. 640.51 g d. 1,626.89 g
Answer:
c. 640.51
Explanation:
Given: 2.54 cm = 1 inch weighed 3.88 ounces
1 g = 0.035273 ounces
? = 3.88 ounces
? = (3.88 x 1) / 0.035273
? = 109.999 = 110 g
110 g = 3.88 ounces
2.54 cm = 110 g
14.79 cm = ?
? = (14.79 x 110) / 2.54
? = 640.51 g
According to unit conversion, there are 640.51 g would a 14.79 cm length of same iron rod weigh.
What is unit conversion?Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
Given: 2.54 cm = 1 inch weighed 3.88 ounces,1 g = 0.035273 ounces
x = 3.88 ounces
x= (3.88 x 1) / 0.035273
x = 109.999 = 110 g
110 g = 3.88 ounces
Thus,2.54 cm = 110 g
14.79 cm = x
x= (14.79 x 110) / 2.54
x = 640.51 g
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name the two products formed when hydrocarbons burn in oxygen
Answer:
carbon dioxide nd water
Explanation:
mark brainliest
Why do some substances float on water?
they are less dense
than water
they are warmer
than water
they are more
dense than water
(b)
Zinc chloride can be prepared in the laboratory by the reaction between zinc oxide and
hydrochloric acid.
The equation for the reaction is
ZnO + 2HCI —— ZnCl2 + H2O
A 0.0830 mol sample of pure zinc oxide was added to 100 cm of 1.20 mol dmº
hydrochloric acid.
Calculate the maximum mass of anhydrous zinc chloride that could be obtained from the
products of this reaction.
The maximum mass of anhydrous zinc chloride that could be obtained from the products of the reaction is 8.18 g
StoichiometryFrom the question, we are to determine the maximum mass of anhydrous zinc chloride that could be obtained
From the given balanced chemical equation,
ZnO + 2HCl → ZnCl₂ + H₂O
This means 1 mole of ZnO will completely react with 2 moles of HCl to produce 1 mole of ZnCl₂ and 1 mole of H₂O
From the given information
Number of moles of ZnO = 0.0830 mole
Now, we will calculate the number of moles of HCl that is present
Volume of HCl added = 100 cm³ = 0.1 dm³
Concentration of the HCl = 1.20 mol/dm³
Using the formula,
Number of moles = Concentration × Volume
Number of moles of HCl present = 1.20 × 0.1 = 0.120 mole
Since
1 mole of ZnO will completely react with 2 moles of HCl to produce 1 mole of ZnCl₂
Then,
0.06 mole of ZnO will react with the 0.120 mole of HCl to produce 0.06 mole of ZnCl₂
Therefore, maximum number of moles of anhydrous zinc chloride that could be produced is 0.06 mole
Now, for the maximum mass that could be produced
Using the formula,
Mass = Number of moles × Molar mass
Molar mass of ZnCl₂ = 136.286 g/mol
Then,
Mass = 0.06 × 136.286
Mass = 8.17716 g
Mass ≅ 8.18 g
Hence, the maximum mass of anhydrous zinc chloride that could be obtained from the products of the reaction is 8.18 g
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9. Which mass measurement contains a total of three
significant figures?
A) 22.0 g
C) 220 g
B) 22.00 g
D) 2200 g
Answer:
A
Explanation:
2 has 4, 3 and 4 both have 2.
(if 3 had a decimal point it would have 3 sig figs)
The mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.
What is mass?Mass is defined as the inertia, a fundamental feature of all stuff, is quantified.
It is also defined as a dimensionless quantity that represents the mass of a particle or object.
Mass can be expressed as
Mass = density x volume
Significant figure is defined as a number in positional notation is a set of digits that may be relied on to signify the quantity of anything.
It can also be defined as the amount of significant single digits from 0 to 9 in the coefficient of the expression that accurately conveys the meaning.
Thus, the mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.
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(c) Write a chemical equation for the reaction between sodium and fluorine.
The chemical reaction will be NaF
Answer:
2Na + F_2
Here Sodium is taken in solid form and Fluorine is taken as gaseus
Hydrogen and oxygen react to produce water according to the following equation.
2H2 + O2 → 2H2O
The molar mass of hydrogen gas (H2) is 2 g/mol. The molar mass of oxygen gas (O2) is 32 g/mol. When the reaction starts with 64 grams of oxygen and a sufficient quantity of hydrogen, how many moles of water are produced?
A 8
B 2 ***
C 18
D 4
Answer:
D 4
Explanation:
32g/mol of oxygen is O2
64g/mol of oxygen is 2*32= 2O2
Balancing the reaction gives
4H2 + 2O2 => 4H2O
That is 4 moles of water
The number of water molecules produced is equal to 4 mol when the reaction starts with 64 grams of oxygen. THerefore, option (D) is correct.
What is a mole?A mole can be described as an international standard unit that is used to determine a given count of particles. The particles counted are generally chemically entities, individually distinct.
A mole can calculate a large number of quantities of molecules, atoms, ions, or other particular particles. The amount of chemical substance can be defined as a measure of elementary entities of a substance in a given sample.
The number of entities present in one mole can be described as equal to 6.023 × 10 ²³ is also known as Avogadro’s constant.
Given the chemical equation of water formation:
[tex]2H_2 + O_2 \longrightarrow 2H_2O[/tex]
Given, the mass of oxygen gas = 64 g
The number of moles of oxygen gas = 64/32 = 2 mol
From the chemical equation, we can say that one mole of oxygen gas forms two moles of water molecules.
2 moles of oxygen gas will water molecules = 2 ×2 = 4 mol
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Propane, C3H8, is a liquid in a pressurized barbecue tank but vaporizes instantly as it
flows out of the tank. Calculate the mass of propane that would vaporize as a result
of absorbing 100.0 kJ of energy. The molar enthalpy of vaporization of propane is
15.7 kJ/mol.
The mass of propane, C₃H₈ that will vaporise as a result of absorbing 100 KJ of energy is 280.25 g
Data obtained from the question Molar enthalpy of vaporization of propane = 15.7 KJ/molEnergy = 100 KJ Mass of propane =? How to determine the mass of propane1 mole of propane C₃H₈ = (3×12) + (1×8) = 44 g
From the question given above,
15.7 KJ of heat energy vaporised 44 g of propane.
Therefore,
100 KJ of heat energy will vaporise = (100 × 44) / 15.7 = 280.25 g of propane
Thus, 280.25 g of propane were vaporised from the tank.
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(05. 04 MC)
The following reaction shows sodium hydroxide reacting with sulfuric acid.
NaOH + H2SO4 → Na2SO4 + H2O
How many grams of Na2SO4 are produced from 10. 0 grams of NaOH?
(Molar mass of Na = 22. 989 g/mol, O = 15. 999 g/mol, H = 1. 008 g/mol, S = 32. 065 g/mol) (4 points)
a
17. 8 grams
b
19. 2 grams
c
35. 5 grams
d
38. 5 grams
will mark brainliest
Answer:
17.8 grams
Explanation:
The mass of Na₂SO₄ produced is 35.5g
What is a mole?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of NaOH = 10 g
Molar mass of NaOH = 23 + 16 + 1 = 40
Molar mass of NaSO = (23 × 2) + 32 + (4 × 16) = 142
Moles = mass ÷ molar mass
moles of NaOH = 10 ÷ 40
= 0.25
From the reaction, 1 mole of NaOH gives 1 mole of Na₂SO₄.
Thus, 0.25 moles of NaOH gives 0.25 moles of Na₂SO₄.
Mass of Na₂SO₄. = 0.25 × 142
=35.5g
Therefore, the mass of Na₂SO₄ produced is 35.5g
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Which would be the best way to represent the concentration of a 1.75 m k2cro4 solution? 1.75% k2cro4 [k2cro4] (k2cro4) k2cro4, [m] = 1.75
The best way to represent the concentration of a 1.75 m K₂CrO₄ solution is [K₂CrO₄] = 1.75M.
What is concentration?Concentration of any substance will give idea about the quantity of that substance present in given volume.
Concentration will be express in many ways like molarity, molality, mole fraction and so on. And to express the quantity in concentration we will use the big square closed bracket like this [ ].
Hence, best way is [K₂CrO₄] = 1.75M.
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Answer:
B.
Explanation:
Iday!' Read the following phrases from the article. 1. Full-scale war 2. Braces for a full invasion 3. Hostile act 4. Defenses on its eastern flank Why does the author use these words?
a. To call attention to Vladimir Putin's objective with the attack on Ukraine
b. To highlight the offensive steps taken by the Russian military
c to emphasize the heightened degree of military engagement
d. To document President Zelenskyy's aggressive approach to defending his country
Answer:
c.
Explanation:
A sample of a gas at 15 C and 1 atm has a volume of 2.58 L. What volume will this gas occupy at 38 C and 1 atm? (HINT: Pressure is constant)
Answer value
Answer:
V2 = 2.79
Explanation:
T1 = 15C = 288.15K
P1 = 1 atm
V1 = 2.58L
T2 = 38C = 311.15K
P2 = 1 atm
V2 = ?
P1V1/T1 = P2V2/T2 must be changed to T2P1V1/T1/P2
311.15 x 1 x 2.58 ÷ 288.15 ÷ 1 = V2
V2 = 2.79 L
So 2.79 L is the answer!!
Will a non-metal replace a metal?
Answer:
In displacement reactions
Explanation:
Choose all the answers that apply
The boiling point of water is ___
A. 100°C
B. 100°F
C. 212°C
D. 212°F
PLEASE HURRY I NEED THE ANSWER FAST
Answer:
a and d but were in America so d
PLEASE HELP! I will give brainliest!
4. You have knowledge of the outermost electron states of the atoms, trends in the periodic table, and the patterns of chemical properties. Use that knowledge to predict the products of each of the following equations. Then explain how you made your predictions. Be sure to balance the equations. (4 points)
a. ___NaBr + ___Ca → _______ + _______
b. ___Mg + ___O2 → _______
The reactions are completed as folows;
2NaBr + Ca -----> CaBr2 + Na
2Mg + O2 ----> 2MgO
What is the electrochemical series?The electrochemical series has to do with the arrangement of atoms in order of reactivity. The metals that are up in the series are more reactive than the metals that are below.
In this case, the reactions are completed as folows;
2NaBr + Ca -----> CaBr2 + Na
2Mg + O2 ----> 2MgO
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Chapter 3 Question: What was produced during the reaction between the iron pipes and the fertilizer?
Claim 1: During the chemical reaction, only the rust was produced.
Claim 2: During the chemical reaction, the rust and another substance were produced.
write an argument and Explain to the people of Westfield what is in their water.
Claim 2 is correct as during the chemical reaction, the rust and another substance were produced.
What is a Chemical reaction?This is defined as two or more substances being converted to new substances known as products.
The reaction between iron pipes and the fertilizer will lead to the formation of products such as rust and another substance. The people of Westfield may likely have compounds such as Sodium nitrite in their water.
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c. What is the heat of reaction for the process described in (a)? Hint: Apply Hess's law using the data in (b)
During a chemical reaction, the quantity of heat can only be added or removed in aim to maintain all of the components involved at almost the same temperature. It can be described by Hess's law.
What is Hess's Law?The total enthalpy change for a reaction is the sum of all changes, according to Hess's Law of Constant Heat Summation. The fact that enthalpy is just a state function is demonstrated by this law.
Hess's law can be expressed as:
Δ[tex]H_{reaction}[/tex] = ∑nΔ[tex]H_{product}[/tex] - ∑nΔ[tex]H_{reactant}[/tex].
where, n indicates stoichiometric coefficients, ΔH indicates enthalpy of reaction( reactant and product)
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Answer: 176.18 kJ/mol
Explanation:
What is the vapor pressure in kPa and atm of ethanoic acid at 120C?
Answer:
Explanation : Ethanoic acid has the lowest vapor pressure i.e 0.08 atm at the temperature of 50°C compared to the other given options
Explanation:
Question 2 of 19
The graph below shows how the temperature and volume of a gas vary when
the number of moles and the pressure of the gas are held constant. What
happens to the temperature of a gas as its volume increases?
T
A. The temperature doubles.
B. The temperature decreases.
C. The temperature remains the same.
D. The temperature increases.
PREVIOUS
Answer:
D
Explanation:
The temperature increases
The three-carbon structure that forms the backbone of a triglyceride is called.
Glycerol is the three-carbon backbone of triglycerides, while fatty acids are longer chains of carbon molecules attached to the glycerol backbone.
Which type of bond will form between two chlorine atoms?
an ionic bond
a metallic bond
a polar covalent bond
a nonpolar covalent bond
Answer:
D. a nonpolar covalent bond
Answer:
D a nonpolar covalent bond
Explanation:
edge 2020
How many moles are in 250 grams of Xenon?
Answer:
[tex]1.90[/tex] [tex]moles[/tex]