Question 1

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

Accepted Answer

To calculate the percent by weight of iron in the alloy, we divide the weight of iron (40 grams) by the total weight of the sample (50 grams) and multiply by 100. Thus, (40/50) x 100 = 80%. Therefore, the statement is true.

Question 2

If 3333 is divided by 5.0,the answer should have two significant figures.

Accepted Answer

The answer of If 3333 is divided by 5.0,the answer...

Question 3

If 100 people in a town of 5,000 people own a certain color car,this represents 0.1% of the population.

Accepted Answer

100 out of 5,000 people is 2% of the population (100/5000 = 0.02, which is 2%).

Question 4

To convert microliters to liters,you should multiply by 1 liter/1,000,000 microliters.

Accepted Answer

This is the correct conversion factor for microliters to liters.

Question 5

To convert micrograms to grams,you should multiply by 1,000,000 g/microgram.

Accepted Answer

To convert micrograms to grams, you should divide by 1,000,000 g/microgram.

Question 6

The number twelve,representing a dozen,has two significant figures.

Accepted Answer

This is true because the number 12 has two digits/significant figures.

Question 7

A patient weights 220 lbs.A medication for this patient is supposed to be taken 3 mg per kg per day.The correct dose for this patient is 3000 mg per day.

Accepted Answer

First, convert the patient's weight from pounds to kilograms: 220 lbs / 2.2 = 100 kg. Then, calculate the dose: 3 mg/kg/day * 100 kg = 300 mg/day. The correct dose is 300 mg per day, not 3000 mg.

Question 8

If a 200 gram sample of water is partially frozen forming 40 g of ice,than 80% of the original sample is still a liquid.

Accepted Answer

The original sample weighed 200g, and 40g of that is now ice. So the remaining liquid portion of the sample is 200g - 40g = 160g. To check what percentage of the original sample is still a liquid, we can simply calculate:

(liquid portion / original sample) x 100% = (160g / 200g) x 100% = 80%

Therefore, 80% of the original sample is still a liquid, making the statement true.

Question 9

One system of rating food is to determine its energy density in kcal/g.If your 200 g snack contains 100 g fat (900 cal/g)and a total of 100 g of protein and carbohydrates (400 cal/gram).what is its energy density?

Accepted Answer

The answer of One system of rating food is to...

Question 10

A sample of urine is measured to have the density of 1.15 g/mL which is an indicator that there may be a medical problem.

Accepted Answer

A urine density of 1.15 g/mL is higher than normal and may be indicative of a medical problem such as dehydration or kidney disease.

Question 11

A Celsius degree is the same size as a Kelvin degree.

Accepted Answer

This is because both Celsius and Kelvin scales have the same size of degree (1°C = 1 K), but they have different starting points (0°C = 273.15 K).

Question 12

The average gestation period (length of a pregnancy)for humans is 40 weeks.If a child if born after just 36 weeks,what was the percentage of this gestation period compared to the normal length?

Accepted Answer

The answer of The average gestation period (length of a...

Question 13

The figure shown below is an example of what type of molecule?

Accepted Answer

The answer of The figure shown below is an example...

Question 14

It turns out that the dark side of the moon has as a mean temperature of -280 ^oF.What would that the temperature be on the Kelvin scale?

Accepted Answer

The answer of It turns out that the dark side...

Question 15

The number 6730.0 contains five significant figures.

Accepted Answer

The number 6730.0 has a decimal point which indicates that the zeros are significant, making it a 5 significant figure value.

Question 16

Which of the following properties is characteristic of a mixture?

Accepted Answer

A mixture is made up of two or more substances that are not chemically combined. Therefore, the physical properties of a mixture can vary depending on the composition of the components. This is in contrast to a pure substance, which has constant physical and chemical properties regardless of how much of it there is. Choices A and C describe properties of pure substances, while choice D describes a substance that is chemically bonded and not a mixture.

Question 17

If 6526 is added to 15.0,the answer should have two significant figures.

Accepted Answer

When performing addition, the number of significant figures should be based on the least precise term in the calculation. Since 15.0 has three significant figures, the answer should have three significant figures as well. Therefore, the correct answer is B.

Question 18

A particular medication is a heterogeneous mixture.Since heterogeneous mixtures are consistent throughout,this medication does not need to be shaken.

Accepted Answer

Heterogeneous mixtures contain particles that are not evenly distributed, so shaking is necessary to ensure consistent distribution of the particles throughout the mixture.

Question 19

To convert feet to inches,you should multiply by the factor 12 in./ft.

Accepted Answer

This is a true statement. To convert feet to inches, we need to multiply the measurement by 12 because there are 12 inches in one foot.

Question 20

You are saving for a new $1226 (including taxes)laptop computer using earnings from your part-time job.At that job,you work 20 hours/week,earning $10.25/hour take home pay.If you can save 25% of all of your income,how many weeks will it take for you to save enough money?

Accepted Answer

First, calculate the weekly earnings: 20 hours/week * $10.25/hour = $205/week. Then, calculate the savings per week: 25% of $205 = $51.25/week. Finally, calculate the number of weeks needed to save $1226: $1226 / $51.25/week = approximately 23.92 weeks, which rounds up to 24 weeks.

Quiz 1: Matter, measurements, and Calculations

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

If 3333 is divided by 5.0,the answer should have two significant figures.

If 100 people in a town of 5,000 people own a certain color car,this represents 0.1% of the population.

To convert microliters to liters,you should multiply by 1 liter/1,000,000 microliters.

To convert micrograms to grams,you should multiply by 1,000,000 g/microgram.

The number twelve,representing a dozen,has two significant figures.

A patient weights 220 lbs.A medication for this patient is supposed to be taken 3 mg per kg per day.The correct dose for this patient is 3000 mg per day.

If a 200 gram sample of water is partially frozen forming 40 g of ice,than 80% of the original sample is still a liquid.

One system of rating food is to determine its energy density in kcal/g.If your 200 g snack contains 100 g fat (900 cal/g) and a total of 100 g of protein and carbohydrates (400 cal/gram) .what is its energy density?

A sample of urine is measured to have the density of 1.15 g/mL which is an indicator that there may be a medical problem.

A Celsius degree is the same size as a Kelvin degree.

The average gestation period (length of a pregnancy) for humans is 40 weeks.If a child if born after just 36 weeks,what was the percentage of this gestation period compared to the normal length?

The figure shown below is an example of what type of molecule?

It turns out that the dark side of the moon has as a mean temperature of -280 ^oF.What would that the temperature be on the Kelvin scale?

The number 6730.0 contains five significant figures.

Which of the following properties is characteristic of a mixture?

If 6526 is added to 15.0,the answer should have two significant figures.

A particular medication is a heterogeneous mixture.Since heterogeneous mixtures are consistent throughout,this medication does not need to be shaken.

To convert feet to inches,you should multiply by the factor 12 in./ft.

You are saving for a new $1226 (including taxes) laptop computer using earnings from your part-time job.At that job,you work 20 hours/week,earning $10.25/hour take home pay.If you can save 25% of all of your income,how many weeks will it take for you to save enough money?

Quiz 1: Matter, measurements, and Calculations

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

If 3333 is divided by 5.0,the answer should have two significant figures.

If 100 people in a town of 5,000 people own a certain color car,this represents 0.1% of the population.

To convert microliters to liters,you should multiply by 1 liter/1,000,000 microliters.

To convert micrograms to grams,you should multiply by 1,000,000 g/microgram.

The number twelve,representing a dozen,has two significant figures.

A patient weights 220 lbs.A medication for this patient is supposed to be taken 3 mg per kg per day.The correct dose for this patient is 3000 mg per day.

If a 200 gram sample of water is partially frozen forming 40 g of ice,than 80% of the original sample is still a liquid.

One system of rating food is to determine its energy density in kcal/g.If your 200 g snack contains 100 g fat (900 cal/g) and a total of 100 g of protein and carbohydrates (400 cal/gram) .what is its energy density?

A sample of urine is measured to have the density of 1.15 g/mL which is an indicator that there may be a medical problem.

A Celsius degree is the same size as a Kelvin degree.

The average gestation period (length of a pregnancy) for humans is 40 weeks.If a child if born after just 36 weeks,what was the percentage of this gestation period compared to the normal length?

The figure shown below is an example of what type of molecule?

It turns out that the dark side of the moon has as a mean temperature of -280 oF.What would that the temperature be on the Kelvin scale?

The number 6730.0 contains five significant figures.

Which of the following properties is characteristic of a mixture?

If 6526 is added to 15.0,the answer should have two significant figures.

A particular medication is a heterogeneous mixture.Since heterogeneous mixtures are consistent throughout,this medication does not need to be shaken.

To convert feet to inches,you should multiply by the factor 12 in./ft.

You are saving for a new $1226 (including taxes) laptop computer using earnings from your part-time job.At that job,you work 20 hours/week,earning $10.25/hour take home pay.If you can save 25% of all of your income,how many weeks will it take for you to save enough money?

It turns out that the dark side of the moon has as a mean temperature of -280 ^oF.What would that the temperature be on the Kelvin scale?