Science Problems

Which of the following units is used for measuring volume? A.Newton B.liters C.centimeter D.grams

Answer: B. Liters

Which of the following units is used for measuring mass A.seconds B.grams C.minutes D. liters

Answer: B. grams

A block of wood is 0.4 m by 0.2 m by 0.7 m. Find its dimensions in centimeters. Then find its volume in cubic centimeters.

1.) A cube box first dimensions in cm with length= 40 Width=70 Width= 20 2.) V=56,000

Solve Make the following conversions. 1,500 mL to L b. 2 km to cm c. 5.8 dg to mg d. 22°C to K

A. 1.5 l B. 200,000cm C. 580 ml D. 295.15k

How Penicillin Was Discovered In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. He noticed that a mold called Penicillium was also growing in some of the dishes. A clear area existed around the mold because all the bacteria that had grown in this area had died. In the culture dishes without the mold, no clear areas were present. Fleming hypothesized that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and test it to see if it would kill bacteria. Fleming transferred the mold to a nutrient broth solution. This solution contained all the materials the mold needed to grow. After the mold grew, he removed it from the nutrient broth and then added the broth to a culture of bacteria. He observed that the bacteria in the culture died. Fleming's experiments were later used to develop antibiotics.

6. State the question or problem that Fleming investigated. Flemming investigated why the bacteria died when the penicillium grew on the dishes. 7. What was Fleming's hypothesis? Flemmings hypothesis was that there must be a chemical that the mold was producing that killed the bacteria. 8. How was the hypothesis tested? He isolated the substance to see if the mold would kill the bacteria. 9. Write a statement that summarizes the results of the experiment. Flemmings's hypothesis was correct, the mold was producing a chemical that was eliminating the bacteria. Because of his hypothesis or conclusion, antibiotics were developed in the future. 10. This experiment led to the development of what major medical advancement? This experiment led to the major medical advancement of antibiotics.

Which of the following units is used for measuring density? A.milliliters B.g/mL C.liters D.cubic cm

ANswer: C. Liters

30 mg is the same mass as A.0.3 grams B.0.0003 kg C.300 decigrams D.0.03 g

ANswer: D. 0.03 g

1. What is the density of CO gas if 0.196 g occupies a volume of 100 ml?

Answer: 0.00196 g/ml

2. A block of wood 3 cm on each side has a mass of 27 g. What is the density of the block? (Hint, don't forget to find the volume of the wood.)

Answer: 1 g/cm³

7.5 liters of a certain solution contain 37 grams of salt. What is the density of salt in the solution? Round your answer, if necessary, to the nearest tenth.

Answer: 4.9

7. A sample of iron has the same dimensions of 2 cm x 3 cm x 2 cm. If the mass of this rectangular-shaped object is 94 g, what is the density of iron?

Answer: 7.83 g/cm³

10.10 cm Which of the following units is used for measuring length A.meters B.Newton C.minutes D.liters

Answer: A. Meters

What is 0.05 mL? * A.5 liters B.0.00005 liters C.0.0005 liters D.50 liters

Answer: B. 0.00005 liters

Which of the following is an example of an SI unit A. foot B. Second C.Pound D.Gallon

B.second

A variable that does NOT change as another variable changes

Constant

Convert 10 km= ___________________ m

Correct Answer: 10,000

Convert 1000 kg = _________________________ cg

Correct Answer: 100,000,000

Convert 1L = __________________________ mL

Correct Answer: 1000

Convert 160 cm= _______________________ dm

Correct Answer: 16 dm

Convert 5.7 kg= ________________________ mg

Correct Answer: 5,700,000

Convert 9,674,444 g =________________ kg

Correct Answer: 9,674.444

What symbol is decilitre? A. dl B. dcl C. dkl D. ld

Correct Answer: A. dl

Which of the following is not a derived unit? A. dm³ B. m Ć. cm³ D. g/ml

Correct Answer: B. m

What's the volume equivalent to 12.0 mL? A.0.12 L B.120 L C.0.012 L D. 12000 L

Correct Answer: C. 0.012 L

30 microliters is the sames as which of the following A.30000 deciliters B. 0.000003 liters C.0.03 milliliters D. 30000000 liters

Correct Answer: C. 0.03 Mililiters

Convert 3,264 mL =____________________ L A.) 326.4 B.) 0.3264 C.) 3.264 D.) 326.4

Correct Answer: C. 3.264

Convert 30cm= ___________________m A.0.30 B. 3 C.300 D.0.3 E. 30

Correct Answer: D. 0.3

One one-thousandth is expressed by which prefix? A. Kilo B. Nano C. Centi D.Mili

Correct Answer: D. milli

On Which of the following is SI based? A. Inches B. Powers of 5 C. English Units D. Powers of 10

Correct answer: D. Powers of 10

Calculate the density of an object having a mass of 17 g and a volume of 3 cm3.

D= 5.666... g/cm3

Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Smithers counts how many stacks of papers each group has made. Group A made 1,587 stacks. Group B made 2,113 stacks. Find the 1. Control Group 2. Independent Variable 3. Dependent Variable 4. What should Smithers conclusion be?

Identify the - 1. Control Group- Group B who is not given the special juice 2. Independent Variable- Special Juice 3. Dependent Variable- The amount of papers stapled 4. What should Smithers conclusion be?- His conclusion should be that the special juice does not work 100%. This is because the control group had even more stacks than the group with the special juice which shows that the juice isn't 100% effective.

Homer notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice will get rid of the green slime. Homer decides to test this out by spraying half of the shower with coconut juice. He sprays the other half of the shower with water. After 3 days of "treatment" there is no change in the appearance of the green slime on either side of the shower.

Identify the - 6. Constant- shower head 7. Control Group-The other half of the shower 8. Independent Variable coconut juice 9. Dependent Variable the slimy green shower 10. What should Homer's conclusion be? Homer's conclusion should be that his friend was incorrect and the coconut juice is not effective at all.

What are the conversions for the ladder method.

Kilo, Hecto, Deka, Basic Deci, Centi, Mili Unit Meters Liters Grams

density

Mass per unit volume ( important ) D= m over v

An exact quantity that people agree to use to compare measurements

Standard

What are the 6 scientific methods?

State Problem, Research and gather info, form hypothesis, test hypothesis, Analyze data, Draw Conclusion

If you are finding the density or the volume what do you do

You have to divide

When you convert to a larger unit where do you move to on the ladder conversions. Ex: 16dal(dekaliter)______________________ kl

You move left also known as dividing Ex: 16dal______________________ kl Since it is kilo to kl you are converting to you are moving 2 times to the left so. .1.6. So your answer would be 0.16

When you are converting to a smaller unit where do you move on the ladder of conversions. Give an example use Ex: 16kl______________________ dal(dekaliter)

You move right also known as multiplying. Ex: 16kl______________________ dal(dekaliter) Since it is kilo to deka you are moving 2 times to the right so. 16. . . So your answer would be 1600.

derived units

combination of base units

A test set up under controlled conditions

experiment

A visual display of data

graph

The amount of matter in an object

mass

Reproducibility

produce the same result consistently

the amount of space occupied by an object

volume

If you are finding the mass what do you do

you multiply