A 55.0 g piece of iron at 505 ° C is put into 735 grams of water at 15.0 ° C. What is the final temperature of the water and the iron?

Answers

Answer 1

Answer:

Answer:

It would be 95.3

Explanation:

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As ice transforms into steam, A)new molecules are formed. B)the types of atoms are changed. C)energy is absorbed by the molecules. D)the mass of the molecules is increased.

Answers

This is an example of a substance changing state, a physical change, the molecules are changed, but the atoms themselves do not change, just their arrangement, and the mass of the molecules is the same. Therefor energy is absorbed by the molecules, as energy is required to change the state or physicality of a molecule structure.Hope this helps. Let me know if you need additional help!

The answer is C) energy is absorbed by the molecules.

What is the change in temperature in a 128g sample of water if it absorbs 2808J of heat energy at a temperature of 2°C?

Answers

Given:

128g sample ofwater

2808J of heatenergy

Required:

Change intemperature

Solution:

This can be solvedthrough the equation H = mCpTwhere H is the heat, m is the mass, Cp is the specific heat and T is the change in temperature.

The specific heatof the water is 4.18 J/g-K

Plugging in thevalues into the equation

H = mCpT

2808J = (128g)(4.18 J/g-K) T

T= 5.25 K

Hydrogen bonds can be found between molecules of which substance?A: CH4
B: H2o
C: HI
D: C3H8

Answers

Hydrogen bonds take place between the molecules of H2O.

• Hydrogen bonding takes place only in the molecules where the hydrogen is covalently bonded to nitrogen, oxygen, or fluorine.

• The electronegativity of these three elements is so much that they withdraw most of the electron density in the covalent bond with hydrogen, leaving the atom of hydrogen extremely electron-deficient.

• In the molecule of water, the nucleus of oxygen with +8 charges attracts electrons better than the nucleus of hydrogen with its +1 charge.

• The hydrogen atoms apart from being covalently bonded with the atoms of oxygen are also attracted towards the oxygen atoms nearby. This attraction is the basis of the hydrogen bonds.

Thus, option B, H2O is correct.

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Final answer:

Hydrogen bonds can be found between molecules of H2O (water). This is due to the fact that water has a highly electronegative oxygen atom and hydrogen atoms capable of forming a dipole interaction, thereby constituting a hydrogen bond.

Explanation:

Hydrogen bonds can be found between molecules of substance B: H2O, also known as water. Hydrogen bonding occurs when a highly electronegative atom such as Oxygen (O), Nitrogen (N), or Fluorine (F) is involved and there is a hydrogen atom attached to these. In the case of water, there are two hydrogen atoms bonded to a single oxygen atom, which is highly electronegative. These specific features allow for the formation of a relatively strong dipole interaction, called a hydrogen bond, between separate water molecules.

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Which of the following is not a metal?
A) Ca
B) Se
C) Zn
D) Mn

Answers

B) Selenium is a nonmetal

Ca is not a metal so your answer is a.

How many grams of O2(g) are needed to completely burn 73.7 g of C3H8(g)?

Answers

The balanced reaction is:

C3H8 + 5O2 = 3CO2 + 4H2O

We are given the amount of C3H8 to be reacted with O2. This will be the starting point of the calculations.

73.7 g C3H8 ( 1 mol C3H8/ 44.1 g C3H8 ) ( 5 mol O2 / 1 mol C3H8 ) ( 32.0 g O2 / 1 mol O2 ) = 267.39 g O2

Answer: 267.2 grams

Explanation:

$C_3H_8+5O_2\rightarrow 3CO_2+4H_2O$

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

$\text{Number of moles of propane}=(73.7g)/(44.1g/mol)=1.67moles$

According to stoichiometry:

1 mole of $C_3H_8$ require 5 moles of $O_2$

Thus 1.67 moles of $C_3H_8$ will require = $(5)/(1)* 1.67=8.35moles$ of $O_2$

Mass of $O_2=moles* {\text {Molar mass}}=8.35moles* 32g/mol=267.2$

Thus 267.2 grams of oxygen are required.

Given the balanced equation:2KClO3==> 2KCl + 3O2
Which type of reaction is represented by this equation?
(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement

Answers

Answer: Option (2) is the correct answer.

Explanation:

An equation in which the the number of reactants equal the number of products is known as a balanced equation.

Whereas a reaction in which a compound dissociates into two or more compounds is known as a decomposition reaction.

Therefore, the given reaction $2KClO_3 \rightarrow 2KCl + 3O_2$ represents that $KClO_(3)$ decomposes into KCl and $O_(2)$ .

Hence, it is a decomposition reaction.

Decomposition reaction is the type of reaction that is represented by the given equation. Therefore, the correct option is option 2.

A chemical reaction called a decomposition reaction, often referred to as an analysis or dissociation, occurs when a compound disintegrates into more basic elements. A single compound is transformed into two or more products in this reaction, which may be elements or other compounds.

Decomposition reactions are typically induced by heat, light, electricity, or the presence of a catalyst. These reactions occur because the reactant compound is unstable under certain conditions, leading to its breakdown into more stable products. Therefore, $\rm 2KClO_3 \rightarrow 2KCl + 3O_2$ is a decomposition reaction.

Therefore, the correct option is option 2.

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