Question 1

The ripening of fruit,once picked,is an example of physical change.

Accepted Answer

The ripening of fruit involves chemical changes, including the conversion of starches to sugars, changes in color, and the breakdown of cell walls, which are not reversible and alter the chemical composition of the fruit.

Question 2

Write the following numbers and results in standard notation,with appropriate significant figures. a.7.85 $\times$ 10^-3 b.7.85 $\times$ 10⁴ c.5.920 $\times$ 10³ d. e.7.00 $\times$ 10^-5 f.circumference of a circle,2$\pi$r,where r = 8.7 cm g.

Accepted Answer

The answer of Write the following numbers and results in...

Question 3

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Accepted Answer

The answer of Briefly explain the relationship between hypothesis and...

Question 4

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g.$\pi$r ²,where r = 8.7 cm h.23.24 + 18.6 - 5

Accepted Answer

The answer of Write the following numbers and results in...

Question 5

Which of the following correctly expresses 52,030.2 m in scientific notation?

Accepted Answer

The answer of Which of the following correctly expresses 52,030.2...

Question 6

Bud N.Chemist must determine the density of a mineral sample.His four trials yield densities of 4.77 g/cm³,4.67 g/cm³,4.69 g/cm³,and 4.81 g/cm³.Independent studies found the correct density to be 4.75 g/cm³.Which of the following statements represents the best analysis of the data?

Accepted Answer

The answer of Bud N.Chemist must determine the density of...

Question 7

The potential energy of a car moving on a level road does not depend on its speed.

Accepted Answer

The potential energy of a car is determined by its position relative to the Earth's gravitational field, and is not affected by its speed on a level road. Only the car's kinetic energy will depend on its speed.

Question 8

As part of an experiment to determine the density of a new plastic developed in her laboratory,Sara Ann Dippity measures the volume of a solid sample.Her four trials yield volumes of 12.37 cm³,12.41 cm³,12.39 cm³,and 12.38 cm³.Measurements of other scientists in the lab give an average volume of 12.49 cm³.Which of the following statements represents the best analysis of the data?

Accepted Answer

Sara's results are consistently close together with a small range, indicating high precision. However, they do not agree with the average volume obtained from other scientists, indicating lower accuracy. This suggests that there may have been some sources of systematic error in Sara's measurements, leading to a consistent deviation from the true value.

Question 9

Which of the following correctly expresses 0.000007913 g in scientific notation?

Accepted Answer

Move the decimal point 6 places to the right to get 7.913 x 10^-6. Since the decimal point moved to the left, the exponent on 10 is negative. Therefore, the correct scientific notation is 7.913 x 10^-6 g.

Question 10

As chief chemist at Superior Analytical Products (SAP)you must design an experiment to determine the density of an unknown liquid to three (3)significant figures.The density is of the order of 1 g/cm³.You have approximately 7 mL of the liquid and only graduated cylinders and balances are available for your use.Which of the following combinations of equipment will allow you to meet but not exceed your goal?

Accepted Answer

The answer of As chief chemist at Superior Analytical Products...

Question 11

When a wooden match burns in air,chemical potential energy is converted to kinetic energy.

Accepted Answer

When a wooden match burns, the chemical potential energy stored in the wood and chemicals on the match head is converted into kinetic energy in the form of heat and light, as well as into new chemical products (combustion gases).

Question 12

Give an example of a physical property and a chemical property of each of the following:
a.oxygen gas
b.octane
c.copper

Accepted Answer

The answer of Give an example of a physical property...

Question 13

The S.I.unit of energy is the joule,J.1 J = 1 kg·m²/s².Another energy unit,the erg,was once in widespread use.1 erg = 1 g·cm²/s².Calculate the number of ergs in 1 J,showing all your work.

Accepted Answer

The answer of The S.I.unit of energy is the joule,J.1...

Question 14

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

Accepted Answer

This is true, as many chemical measurements and experiments allow us to gain insights into the behavior and properties of molecules and atoms on a microscopic level.

Question 15

When applying the scientific method,it is important to avoid any form of hypothesis.

Accepted Answer

The scientific method involves forming a hypothesis based on observations and data, and then testing it through experimentation or observation. The hypothesis is an important part of the scientific method.

Question 16

Use the relationship between temperatures in Celsius and Fahrenheit to calculate the temperature at which
a.the numerical value is the same on both scales.
b.the Fahrenheit number is exactly twice the Celsius number.

Accepted Answer

The answer of Use the relationship between temperatures in Celsius...

Question 17

Calculate (to three significant figures)the numerical part of the conversion factors needed to carry out the following unit conversions: a.density in g/cm³ to kg/m³ b.speed in mi/h to ft/s c.area in km² to mi² d.area in km² to cm² e.mass/area of aluminum foil in mg/cm² to g/m² f.number of gas molecules per unit volume from /m³ to /ft³ g.number of bacteria per unit area on a microscope slide from /mm² to /in²

Accepted Answer

The answer of Calculate (to three significant figures)the numerical part...

Question 18

In each of the sets below,choose the one quantity or number which is exact. a.(i. )the human population (ii. )the distance in light years from the sun to Alpha Centauri,a nearby star (iii. )the winning time for the 100 m dash in the Olympic Games b.(i. )the weight of a particular one cent coin in g (ii. )the boiling point of lead,in °C (iii. )the number of cm in 1 yd c.(i. )the measured value of the speed of light (2.998...$\times$ 10⁸ m/s) (ii. ) $\pi$ (3.141... ) (iii. )the volume of milk in a 1-gallon jug

Accepted Answer

The answer of In each of the sets below,choose the...

Question 19

Classify the following properties of hydrogen gas as either intensive or extensive.
a.the mass of the gas sample
b.the average speed of a molecule in the sample
c.temperature
d.density
e.number of molecules present

Accepted Answer

The answer of Classify the following properties of hydrogen gas...

Question 20

An evacuated 276 mL glass bulb weighs 129.6375 g.Filled with an unknown gas,the bulb weighs 130.0318 g.Calculate the gas density in g/L,and express it with an appropriate number of significant figures.

Accepted Answer

The answer of An evacuated 276 mL glass bulb weighs...

Quiz 1: Keys to the Study of Chemistry

The ripening of fruit,once picked,is an example of physical change.

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g. $\pi$ r ²,where r = 8.7 cm h.23.24 + 18.6 - 5

Which of the following correctly expresses 52,030.2 m in scientific notation?

Bud N.Chemist must determine the density of a mineral sample.His four trials yield densities of 4.77 g/cm³,4.67 g/cm³,4.69 g/cm³,and 4.81 g/cm³.Independent studies found the correct density to be 4.75 g/cm³.Which of the following statements represents the best analysis of the data?

The potential energy of a car moving on a level road does not depend on its speed.

Which of the following correctly expresses 0.000007913 g in scientific notation?

When a wooden match burns in air,chemical potential energy is converted to kinetic energy.

Give an example of a physical property and a chemical property of each of the following: a.oxygen gas b.octane c.copper

The S.I.unit of energy is the joule,J.1 J = 1 kg·m²/s².Another energy unit,the erg,was once in widespread use.1 erg = 1 g·cm²/s².Calculate the number of ergs in 1 J,showing all your work.

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

When applying the scientific method,it is important to avoid any form of hypothesis.

Use the relationship between temperatures in Celsius and Fahrenheit to calculate the temperature at which a.the numerical value is the same on both scales. b.the Fahrenheit number is exactly twice the Celsius number.

Classify the following properties of hydrogen gas as either intensive or extensive. a.the mass of the gas sample b.the average speed of a molecule in the sample c.temperature d.density e.number of molecules present

An evacuated 276 mL glass bulb weighs 129.6375 g.Filled with an unknown gas,the bulb weighs 130.0318 g.Calculate the gas density in g/L,and express it with an appropriate number of significant figures.

Quiz 1: Keys to the Study of Chemistry

The ripening of fruit,once picked,is an example of physical change.

Write the following numbers and results in standard notation,with appropriate significant figures. a.7.85 ×\times× 10-3 b.7.85 ×\times× 104 c.5.920 ×\times× 103 d. e.7.00 ×\times× 10-5 f.circumference of a circle,2 π\piπ r,where r = 8.7 cm g.

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g. π\piπ r 2,where r = 8.7 cm h.23.24 + 18.6 - 5

Which of the following correctly expresses 52,030.2 m in scientific notation?

Bud N.Chemist must determine the density of a mineral sample.His four trials yield densities of 4.77 g/cm3,4.67 g/cm3,4.69 g/cm3,and 4.81 g/cm3.Independent studies found the correct density to be 4.75 g/cm3.Which of the following statements represents the best analysis of the data?

The potential energy of a car moving on a level road does not depend on its speed.

Which of the following correctly expresses 0.000007913 g in scientific notation?

When a wooden match burns in air,chemical potential energy is converted to kinetic energy.

Give an example of a physical property and a chemical property of each of the following: a.oxygen gas b.octane c.copper

The S.I.unit of energy is the joule,J.1 J = 1 kg·m2/s2.Another energy unit,the erg,was once in widespread use.1 erg = 1 g·cm2/s2.Calculate the number of ergs in 1 J,showing all your work.

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

When applying the scientific method,it is important to avoid any form of hypothesis.

Use the relationship between temperatures in Celsius and Fahrenheit to calculate the temperature at which a.the numerical value is the same on both scales. b.the Fahrenheit number is exactly twice the Celsius number.

Classify the following properties of hydrogen gas as either intensive or extensive. a.the mass of the gas sample b.the average speed of a molecule in the sample c.temperature d.density e.number of molecules present

An evacuated 276 mL glass bulb weighs 129.6375 g.Filled with an unknown gas,the bulb weighs 130.0318 g.Calculate the gas density in g/L,and express it with an appropriate number of significant figures.

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g. $\pi$ r ²,where r = 8.7 cm h.23.24 + 18.6 - 5

Bud N.Chemist must determine the density of a mineral sample.His four trials yield densities of 4.77 g/cm³,4.67 g/cm³,4.69 g/cm³,and 4.81 g/cm³.Independent studies found the correct density to be 4.75 g/cm³.Which of the following statements represents the best analysis of the data?

The S.I.unit of energy is the joule,J.1 J = 1 kg·m²/s².Another energy unit,the erg,was once in widespread use.1 erg = 1 g·cm²/s².Calculate the number of ergs in 1 J,showing all your work.