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Kazeer [188]
3 years ago
14

If 100 g of a substance reacts with 70 g of another substance, what will be the mass of the products after the reaction?

Chemistry
1 answer:
RideAnS [48]3 years ago
7 0

Answer:

x=170

The question is asking you to add them together to get your unknown number

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How many grams nh3 are equivalent to 9.3 x 1023 molecules nh3?
ICE Princess25 [194]

To solve this, we need the Avogadros number to convert to moles then multiply with molar mass to convert to mass in grams.

 

moles = 9.3 x 10^23 molecules * (1 mol / 6.022 x 10^23 molecules)

moles = 1.54 moles

 

Molar mass of NH3 is 17 g/mol:

mass = 1.54 moles * 17 g/mol

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The molar mass of argon is 40 g/mol. what is the molar mass of a gas if it effuses at 0.91 times the speed of argon gas?
Gemiola [76]
To determine the molar mass of the unknown gas, we use Graham's Law of Effusion where it relates the effusion rates of two gases with their molar masses. It is expressed as r1/r2 = √M2/M1. We calculate as follows:
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r2 = 0.91r1r1/r2 = 1/0.91
1/0.91 = √M2/M1 = √M2/40M2 = 48.30 g/mol
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4 years ago
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3 years ago
describe a general rule for predicting the motion of an object that is being pushed or pulled by unbalanced forces?
7nadin3 [17]

<span>7th grade activities</span>

Force and Motion

(with Work)

 

2010-2011

 

 

<span>
</span>

Outline of Topics:

<span>1.     </span><span>Describing Motion: Graphing, Speed and Velocity  </span>

<span>2.   Describing Motion: Changing Velocity </span>

<span>3.   Forces, Their Sizes and Direction </span>

<span>4.   Force and Mass </span>

<span>5.   Its a grave matter: gravity and inertia </span>

<span>6.   Weight and Mass </span>

<span>7.   All work and no play: Work and Energy </span>

 

Appendices

<span>1:  7th Grade Vocabulary Related to Force and Motion</span>

<span>2:  Motion Detector Directions</span>

<span>3:  Day 1 Graphs with Focus Question at the End</span>

<span>4:  Day 1 Data Collection Sheet </span>

<span>5:  Day 2 Student Problem Sheet</span>

<span>6:  Day 2 Second Set of Problems</span>

<span>7:  Day 2 Graphs for is the Velocity Changing</span>

<span>8:  Day 3 Student Tables with Questions</span>

<span>9:  Day 4 Frame for Science Notebook</span>

<span>10:  Day 5 Skateboard Prediction and Actual Sheets</span>

<span>11:  Day 6 Data Table</span>

12: Day 7 Student Handout

13: Day 7 Force Arrows

<span>14:  Day 8 Data Analysis</span>

<span>15:  Uncovering Student Ideas in Physical Science probes</span>

<span>16:  National Enquirer advertisements</span>

<span>17: Excerpt from Joy Hakim’s The Story of Science: Newton at the Center, pages 172-183</span>

<span>18:  Directions for converting You Tube videos to another media file</span>

 

<span>
</span>

<span>First topic:  Describing motion</span>

A three-day exercise

Learning goals

<span>Reviewed from 6th grade (day 1): </span>

I can interpret a position versus time line graph to determine types of one-dimensional motion of an object.

I can draw a position versus time line graph given appropriate data.

I can represent changes in motion in a variety of ways, including words, motion arrows, graphs, and by acting out.

(Day 2) I can use the information in a position vs. time graph to determine the speed of an object.

<span>New for 7th grade: I can define velocity.</span>

(Day 3) I can distinguish between speed and velocity.

 

Topic Word Bank

<span> <span><span> <span> Speed </span> <span> Motion </span> </span> <span> <span> Velocity </span> <span> Direction </span> </span> <span> <span> Position </span> <span> Graph </span> </span> <span> <span> Distance </span> <span> Vertical </span> </span> <span> <span> Time </span> <span> Horizontal </span> </span> <span> <span> Rate of change </span> <span> Representation </span> </span> <span> <span> Slope </span> <span> <span>             Negative</span> </span> </span> <span> <span>   </span> <span> <span>             Positive</span> </span> </span> </span></span>

 

<span> <span><span> <span> Sequence of Experiences </span> </span> <span> <span> Day 1: Interpretation of a Position/Time Graph </span> <span> Pairs and whole group </span> <span> 10 minutes </span> </span> <span> <span> Day 1: Creation of a Position/Time Graph </span> <span> Lab groups and whole group </span> <span> 25 minutes </span> </span> <span> <span> Day 1: Making Sense of Multiple Representations </span> <span> Whole Group </span> <span> 10 minutes </span> </span> <span> <span> Day 2: Calculating Speed </span> <span> Pairs and whole group </span> <span> 23 minutes </span> </span> <span> <span> Day 2: Differentiating Speed and Velocity </span> <span> Pairs and whole group </span> <span> 18 minutes </span> </span> <span> <span> Day 2: Exit Slip </span> <span> Individually </span> <span> 5 minutes </span> </span> <span> <span> Day 3 Intro </span> <span> Whole class </span> <span> 3 minutes </span> </span> <span> <span> Day 3:Collecting Initial Data </span> <span> In pairs </span> <span> 12 minutes </span> </span> <span> <span> Day 3:Interpreting Data Parts 1 and 2 </span> <span> In pairs, then groups of 4 </span> <span> 20 minutes </span> </span> <span> <span> Day 3: Student Challenge </span> <span>   </span> <span>   </span> </span> <span> <span> Day 3: Class Discussion </span> <span> Whole class </span> <span> 7 minutes </span> </span> <span> <span> Day 4: Intro </span> <span>   </span> <span>   </span> </span> <span> <span> Day 4:Interpreting Data Parts 3, 4 and 5 </span> <span> Whole class </span> <span>   </span> </span> <span> <span> Day 4: Processing Information </span> <span> Individual and Paired </span> <span>   </span> </span> <span> <span> Day 4: Class Discussion </span> <span> Whole Class </span> <span>   </span> </span> <span> <span> Day 4: Exit Slip </span> <span> Individually </span> <span> 3 minutes </span> </span> </span></span> <span>
</span>

Day 1  <span>Focus Question:  What can be learned from different representations of motion?</span>

Materials and Preparation:

For the class:

<span><span><span><span /></span></span></span>

<span />





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scoundrel [369]

Answer:

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Explanation:

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