Na, C, and O so the answer is c. 3
The hypothesis of this experiment is as follows: IF detergent A is used to wash, THEN the clothes will be cleaner.
HYPOTHESIS:
- Hypothesis is commonly referred to as an educated guess. It is a critical part of the scientific method.
- Hypothesis aims at providing a testable answer to a scientific question or solving a scientific problem. The hypothesis must be testable and can be accepted or not depending on the result of the experiment.
- Hypothesis usually shows how the the independent variable of an experiment affects the dependent variable.
- Hypothesis is written in an IF, THEN...... statement.
- In this experiment to determine the type of detergent that affects the cleanliness of clothes, the hypothesis will read: IF detergent A is used to wash, THEN the clothes will be cleaner.
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Pure substances are defined as substances that are made of only one type of atom or molecule
Answer:
0.075 moles of EDTA are left.
Explanation:
To solve this problem we need to use the definition of Molar concentration (M):
M=
With that equation in mind, in the problem we're given two out of the three factors: Concentration and Volume. We're asked to calculate the remaining factor.
Before we calculate we convert 150 mL to L, so we divide 150 by 1000.
Lastly we calculate the number of moles of EDTA left:
0.5 M * 0.150 L = 0.075 moles.