CHEMISTRY HIGH SCHOOL

Sandy went to the candy store and wanted to use dimensional analysis she had learned in class. She only had a certain amount of money to spend. In terms of price, she figured out the following: 6 lollipops = 5 gum balls, 10 lemon heads = 16 redhots, 8 gum balls = 9 lemon heads. If sandy knows she could buy 3 lollipops, how many lemonheads could she buy with the same money?

Answers

Answer 1

Answer:

Answer:

about 1-60

Explanation:

Answer 2

Answer:

Answer:

she could get 3.6 lemon heads so 3

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What reaction is depicted by the given equation: Au3+ + 3e− Au

1. The following reaction does not proceed to form a product: H2O + Au---> no reaction. Why is that?A) Gold has a higher activity than hydrogen and cannot replace it.
B) Gold has a lower activity than hydrogen and cannot replace it.
C) The reaction cannot occur because water is a reactant.
D) The reaction proceeds too slowly to create products.

2. Which of the following is the balanced form of the equation C2H6 + O2 --> CO2 + H2O?

answer choices are attached A,B,C,D top to bottom

3. The equation 2NaNO3 + CaCl2 ---> 2NaCl + Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation?

A) one
B) two
C) four
D) six

4. All single-displacement reactions can be classified as another type of reaction as well. What type of reaction is that?

A) combustion
B) redox
C) synthesis
D) decomposition

5. If ions change places and a gas is formed, then what type of reaction is indicated?

A) double-displacement
B) synthesis
C) decomposition
D) single-displacement

Answers

1. B
The positive charge in water is provided by hydrogen, and gold provides the same charge. However, gold is not more reactive than hydrogen so it can not replace it in the compound.

2. In order to balance the equation, you must sure there are equal moles of each element on the left and right side of the equation:
2C₂H₆ + 7O₂ → 4CO₂ + ₆H₂O

3. The number of moles of sodium atoms on the left of the equation must be equal to the number of moles of sodium atoms on the right, as per the law of conservation of mass. The answer is B.

4. C.
A synthesis reaction usually results from single displacement because some element or compound is produced in its pure form

5. B.
The gas being produced is being synthesized.

Which of the following values best classifies a bond between 2 atoms as being ionic?A. An electronegativity difference of greater than 1.7 between the atoms
B. An electronegativity difference of greater than 2.7 between the atoms
C. An electronegativity difference of less than 1.7 between the atoms
D. An electronegativity difference of less than 2.7 between the atoms

Answers

The general rule followed is that if electronegativity difference is greater than 2, then it is considered an ionic bond. An ionic bond is a type of bond characterizing a transfer of electrons within a bond. Common examples are salts which adds that ionic bonds are common between a metal and a nonmetal. Therefore, the best answer from above is letter B.

Answer is: A. An electronegativity difference of greater than 1.7 between the atoms.

Electronegativity (χ) is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.

For example, in ionic salt sodium fluoride (NaF), fluorine has electronegativity approximately χ = 4 and sodium χ = 1 (Δχ = 4 - 1; Δχ = 3), fluorine attracts electron and it has negative charge and sodium has positive charge.

How long must bleach stay wet on a surface in order to perform disinfection?