Q: Which of the following is the correct way to express $$0.0000000000000000000000199 in $$scientific notation, and what is the exponent?

$$1.99 \times 10$$^{-23}$$, exponent is -23$

Question 1

Which of the following best describes the correct sequence of steps in the scientific method as outlined in the study materials?

Accepted Answer

Observation $$\rightarrow$$ Hypothesis $$\rightarrow$$ Experiment $$\rightarrow$$ Theory

Question 2

A scientist observes a new chemical reaction and proposes a possible explanation for the observed results. According to the scientific method, what is the scientist proposing?

Accepted Answer

A hypothesis

Question 3

Which of the following statements about the scientific method is correct?

Accepted Answer

A law summarizes a series of related observations and predicts future ones.

Question 4

Which of the following is the correct way to express 315,000,000 in scientific notation?

Accepted Answer

$$3.15 	imes 10^8$

Question 5

The mass of a carbon atom is approximately $$0.0000000000000000000000199$$ grams. Which of the following is the correct scientific notation for this value?

Accepted Answer

$$1.99 	imes 10$$^{-23}$$

Question 6

Which of the following best describes the difference between a hypothesis and a theory in the scientific method?

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a well-established explanation supported by evidence.

Question 7

Which of the following is an example of a scientific law?

Accepted Answer

The statement that energy cannot be created or destroyed

Question 8

A student records the following number: $$0.0000000078. $$What is this number in scientific notation?

Accepted Answer

$$7.8 	imes 10$$^{-8}$$

Question 9

Which of the following best illustrates the application of the scientific method in a real-world scenario?

Accepted Answer

A doctor observes a new symptom, proposes a possible cause, tests it, and develops a new treatment guideline.

Question 10

Which of the following is the correct way to express $$0.0000000000000000000000199 in $$scientific notation, and what is the exponent?

Accepted Answer

$$1.99 	imes 10$$^{-23}$$, exponent is -23$

Question 11

A researcher observes that a chemical reaction always produces the same amount of product under the same conditions. What step of the scientific method does this observation most likely lead to?

Accepted Answer

Formulation of a hypothesis

Question 12

Which of the following is NOT a characteristic of the scientific method?

Accepted Answer

It relies on subjective opinions.

Question 13

A scientist proposes a new explanation for the structure of the atom based on experimental evidence. According to the scientific method, what is this explanation called?

Accepted Answer

A theory

Question 14

Which of the following best describes the purpose of using scientific notation in chemistry?

Accepted Answer

To simplify the expression of very large or very small numbers

Question 15

A student writes the number $$4,500,000 as$$ $$4.5 	imes 10^6$. Which of the following best explains why this is correct?

Accepted Answer

The decimal is moved 6 places to the left, so the exponent is 6.

Chapter 1 Review: Chemistry in Our Lives – Scientific Method and Scientific Notation

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