Q: Which of the following is the correct value for $$ 123.56 \times 10^8$ $$ expressed in scientific notation?

$$ 1.2356 \times 10$$^{10}$$ $$

Question 1

Which of the following best describes the role of chemistry in relation to other scientific disciplines?

Accepted Answer

Chemistry is the foundation for many other scientific disciplines, such as health sciences, nutrition, microbiology, and physiology.

Question 2

A student records the following steps in the scientific method: (1) Observations, (2) Hypothesis, (3) Experiments, (4) Conclusion. Which of the following best describes the purpose of the 'Hypothesis' step?

Accepted Answer

To ask questions about what you observe and propose a possible explanation.

Question 3

Which of the following equations correctly converts a temperature from degrees Fahrenheit ($$ ^\circ F ) to $$degrees Celsius ($$ ^\circ C $$)?

Accepted Answer

$$ ^\circ C = \frac{5}{9} ( ^\circ F - 32 ) $$

Question 4

Solve for $$ n  in $$the ideal gas law equation $$ PV = nRT . $$Which of the following is the correct rearrangement?

Accepted Answer

$$ n = \frac{PV}{RT} $$

Question 5

Given the equation $$ \frac{V_1$}{V_2$} = \frac{T_1$}{T_2$} $$, solve for $$ V_2$ .$$

Accepted Answer

$$ V_2$ = V_1$ \frac{T_2$}{T_1$} $$

Question 6

A chemist needs to solve for $$ x  in $$the equation $$ 15x = 180 . $$What is the value of $$ x $$?

Accepted Answer

$$ x = 12 $$

Question 7

Which of the following best describes the meaning of a negative exponent, as in $$ mol \cdot L$$^{-1}$$ $$?

Accepted Answer

It means the reciprocal, so $$ L$$^{-1}$$  is$$ $$ \frac{1}{L} .$$

Question 8

What is the result of multiplying $$ 10^3$ 	imes 10$$^{-4}$$ $$?

Accepted Answer

$$ 10$$^{-1}$$ $$

Question 9

Express the number 1,500,000 in scientific notation.

Accepted Answer

$$ 1.5 	imes 10$$^{6}$$ $$

Question 10

Which of the following is the correct value for $$ 1 	imes 10$$^{-5}$$ \div 1 	imes 10$$^{3}$$ $$?

Accepted Answer

$$ 1 	imes 10$$^{-8}$$ $$

Question 11

A graph is constructed to show the relationship between temperature and time during a chemical reaction. Which variable should be placed on the x-axis?

Accepted Answer

Time, because it is the variable purposely varied during the experiment.

Question 12

Which of the following best describes the order of operations when evaluating the expression $$ 3 + 2 	imes 5^2$ $$?

Accepted Answer

First calculate the exponent, then multiplication, then addition.

Question 13

Express $$ 0.000156  in $$scientific notation.

Accepted Answer

$$ 1.56 	imes 10$$^{-4}$$ $$

Question 14

Which of the following statements about scientific notation is correct?

Accepted Answer

Scientific notation uses powers of ten to express very large or very small numbers.

Question 15

If $$ x/5 = 8 $$, what is the value of $$ x $$?

Accepted Answer

$$ x = 40 $$

Question 16

Which of the following is the correct solution for $$ \frac{4}{x} = 20 $$?

Accepted Answer

$$ x = 0.2 $$

Question 17

Which of the following best describes the y-axis on a graph in a scientific experiment?

Accepted Answer

It is the measured result of the experiment (dependent variable).

Question 18

Which of the following is the correct value for $$ 123.56 	imes 10^8$ $$ expressed in scientific notation?

Accepted Answer

$$ 1.2356 	imes 10$$^{10}$$ $$

Question 19

If $$ \frac{x+6}{15-x} = 20 $$, what is the value of $$ x $$?

Accepted Answer

$$ x = 14.29 $$

Chapter 1: Chemistry in Our Lives – Math Skills and Scientific Foundations

Guida di studio - Domande di pratica

Study guide - Flashcard