What is the independent variable of the penny lab

Answers

Answer 1

Answer: The independent variable in the experiment is the soap and the dependent variable in the experiment is the number of water drops on the surface of the penny. The control is the penny without soap.

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When an ionic compound such as sodium chloride (NaCl) is placed in water, the component atoms of the NaCl crystal dissociate into individual sodium ions (Na⁺) and chloride ions (Cl-). In contrast, the atoms of covalently bonded molecules (e.g. glucose, sucrose, glycerol) do not generally dissociate when placed in aqueous solution. Which of the following solutions would be expected to contain the greatest number of solute particles (molecules or ions)?A) 1 litre of 0.5 M NaClB) 1 litre of 1.0 M NaClC) 1 litre of 1.0 M glucoseD) 1 litre of 1.0 M NaCl and 1 litre of 1.0 M glucose will contain equal numbers of solute particles.
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What would the initial pH of a acetate/acetic acid buffer system (pKa = 4.75) if the concentration of acetate is 1.36 × 10-2 molar and the concentration of acetic acid is 1.64 × 10-1?A.
5.83
B.
3.67
C.
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D.
1.66

Answers

Answer:

B) pH = 3.67

Explanation:

$pH = pK_(a) +log([A^(-)])/([HA]) \n$

$pH = 4.75+log([1.36*10^(-)2])/([1.64*10^(-1)]) = 3.67$

Different fatty acids are distinguished by the length of their_?double bonds
single bonds
carboxylic groups
carbon chains

Answers

The answer is carbon chains.

Write the number 4.92 x 10-3 from scientific notation to regular.
Please help?????

Answers

Explanation:

4.92*10-3=4.92/10^3=

4.92/1000=0.00492

From which type of clouds do hail pellets form?

Answers

Answer:

Hail pallets forms inside of cumulonimbus clouds

Explanation:

Answer: cumulonimbus hope it helps pls stay safe

Calcium and bromine have formed a bond. Leading up to this, calcium gave up electrons. It was a(n)

Answers

Leading up to this, calcium gave up 2 valence electrons and thus was denoted as a cation. These 2 electrons were transferred to bromine, which received an overall negative charge because of the addition of 2 valence electrons in its valence shell, and thus formed a negatively charged ion, an anion.

Both formed an ionic bond, due to the electrostatic charge of attraction between the 2 oppositely charged ions. If many ions of Ca and Br are present and numerous ionic bonds have formed it will undergo an arrangement which is that of an ionic lattice, type of structure.

How many moles of argon are in 4.80x10^24 atoms of argon

Answers

Answer:

7.97 mol Ar

Explanation:

Use Avogadro's number to convert atoms to moles. This number is the number of atoms in one mole. There are 6.022 × 10²³ atoms in one mole.

Divide the number of atoms given by Avogadro's number.

(4.80 × 10²⁴)/(6.022 × 10²³) = 7.97 mol

There are 7.97 moles of argon.

Answer:

3.0 moles (A P E X)

Explanation: