Which equation represents a single replacement reaction? Thanks!

Answers

Answer 1

Answer: B is a single replacement reaction because it contains an element and a compound reacting together to create a different element and a different compound. Basically one element gets replaced in the reaction thus a single replacement reaction

Answer 2

Answer:

Final answer:

A single replacement reaction is a type of chemical reaction in which one element replaces another in a compound. A common example of this is when zinc replaces hydrogen in hydrochloric acid to create zinc chloride and hydrogen gas.

Explanation:

A single replacement reaction is a chemical reaction in which one element replaces another element in a compound. This type of reaction can be represented as follows: A + BC -> AC + B. In this equation, 'A' is the single element that replaces 'B' in the compound 'BC', forming the new compound 'AC' and releasing 'B' as a separate element.

For example, one common single replacement reaction occurs when zinc replaces hydrogen in hydrochloric acid to form zinc chloride and hydrogen gas. This reaction can be written as: Zn + 2HCl -> ZnCl2 + H2.

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Predict whether a reaction will occur when HClO and Sr(OH)2 solutions are mixed, if yes determine spectator ions in the ionic equation.
Which equation represents a spontaneous transmutation
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Which reaction occurs spontaneously?(1) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq) (2) Cl2(g) + 2NaF(aq)--> F2(g) + 2NaCl(aq) (3) I2(s) + 2NaBr(aq)--> Br2(l) + 2NaI(aq) (4) I2(s) + 2NaF(aq)--> F2(g) + 2NaI(aq)

2. When lithium reacts with bromine to form the compound LiBr,each lithium atom1) gains one electron and becomes a negatively charged ion2) gains three electrons and becomes a negatively charged ion3) loses one electron and becomes a positively charged ion4) loses three electrons and becomes a positively charged ion

Answers

3) Each lithium atom will lose one electron and become positively charged.

This is an example of ionic bonding wherein an electron is transferred from one atom to another. As each atom wants to have complete outer shells (with lithium's having one electron and bromine's having seven) the electron will move from the Lithium to the Bromine. Lithium will become positive as electrons are negatively charged and it has one less electron than it originally had.

Which of the following has the greatest number of atoms? a) 1.0 mol He b) 0.60 mol H2 c) 20 g Potassium d) 8.5 mL H2O (density of H2O = 1 g/mL) e) 22.6 g KMnO4

Answers

Answer:

The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms

Explanation:

We need to convert each value into moles, a count of the number of atoms/molecules.

a) 1.0 moles He

b) 0.60 moles H2

c) 20 grams K: convert to moles with the molar mass of K

(20 grams K)/(39.1 g/mole K) = 0.511 moles K

d) 8.5 mL H2O (density of H2O = 1 g/mL).

Find the mass of the H2): (8.5 ml)*(1 g/ml) = 8.5 grams H2)

Now calculate moles H2): (8.5 grams)/(18 grams/mole) = 0.473 moles H2O

e) 22.6 g KMnO4

(22.6 g KMnO4 )*(158.0 g/mole) = 0.143 moles

Now we need to take into account the number of atoms per molecule:

Molecule Atoms/Molecule Moles Atoms(moles)

He 1 1.0 1.0

H2 2 0.60 1.2

K 1 0.51 0.51

H2O 3 0.47 1.41

KMnO4 6 0.143 0.86

The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms

The temperature at which a substance boils is an example of a physical property.a. True
b. False

Answers

A physicalproperty is any property that does not concern with the change of the substance.The changes in the physical property can be used to describe itstransformations or evolutions from its initial state. They are often referredto as observables. Temperature at which asubstance boils is an example of a physical property. The temperature at which a substance boils describes astate of a physical system. It describes the transformation of a liquid fromits liquid state to its vapor by increasing its temperature.

The answer would be (a.)True.

Compute 3.5×4.48697. Round the answer appropriately. Express your answer numerically using the proper number of significant figures.

Answers

16 because the actual answer is 15.704395 then u round the .7 because it greater than 5 making it 16

Final answer:

The product of 3.5 and 4.48697 is 15.705395, which rounds to 16 when using the appropriate number of significant figures.

Explanation:

To find the product of 3.5 and 4.48697, you would simply multiply the two numbers together. This results in 15.705395.

However, the least number of significant digits in the numbers given is two (in the number 3.5). Therefore, we will round our answer to two significant figures. 15.705395 rounds to 16 when rounding appropriately to two significant figures as we count from the first non-zero digit, which is 1, then to the next digit which is 5.

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What are superconductors?a. Materials that need high heat to transfer energy
c. Materials that only transfer thermal energy
b. Materials that transfer energy with no resistance
d. Materials that convert thermal energy into potential energy User: ______ is/are usually the best conductor/s.
a. Metals
c. Air
b. Water
d. Minerals

Answers

Superconductors are materials that transfer energy with no resistance. Metals are usually the best conductors.

Superconductivity is a phenomenon characterized by zero electrical resistance at below critical temperatures. Metals are the best conductors because the molecules inside them are tightly packed, which allows electricity to travel efficiently.

Water is also a good conductor because of the ions and minerals in it. However, water itself is not a conductor of electricity.

The answer would be B

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Explain the connection between Earth's magnetic field and iron.

Answers

The Earth's magnetic field is somewhat caused by the composition of the earth's core which is rich in iron minerals. There is a solid inner core that is made of iron which makes up to 2/3 of the moon's size. The charged metal of the iron produces electric currents, consequently resulting to Earth's magnetic field.

Answer:

The Earth's magnetic field is caused by how the earth's core is made. The earth's core is full of iron, especially in the inner core. That inner core is charged metal that produces electric currents that causes Earth's magnetic field. So because the core has iron, we have a magnetic field.

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Which statement describes heterogeneous mixtures?A. They are made up of two or more pure substances that are not chemically bonded together. B. They appear uniform, like a pure substance. C. They have fixed ratios between their components. D. They are made up of two or more pure substances that can be separated only by chemical processes.

3 x 1 US cup volume in millilitres (mL

From top to bottom in most groups of elements, atomic radii tend to A. decrease because the nuclear charge increases. B. decrease because electrons are lost to other elements. C. increase because electrons are gained from other atoms. D. increase because additional energy levels are filled.

The molar heat of vaporization of water is 40.7kJ/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 100oC to steam at 100oC?A) 1.46 X 10 kJ B) 1.13 X 102kJ C) 2.04 X 103kJ D) 3.66 X 104kJ