Glyoxal consists of 41.4% c, 3.5% h, and 55.1% o by mass. what is the empirical formula of glyoxal?

Olin [163]

Answer:

c.)the reactants have the same mass as the products

Explanation:

According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

hope it helps!

8 0

3 years ago

NaCl(aq) AgNO3(aq) → AgCl(s) NaNO3(aq) : NaCl(aq) AgNO3(aq) \rightarrow AgCl(s) NaNO3(aq) : blank H2SO4(aq) 2 LiOH(aq) → 2 H2O(l

Elena L [17]

The question is incomplete, here is a complete question.

Categorize each reaction into types of chemical reactions.

(1) $NaCl(aq)+AgNO_3(aq)\rightarrow AgCl(s)+NaNO_3(aq)$

(2) $H_2SO_4(aq)+2LiOH(aq)\rightarrow 2H_2O(l)+Li_2SO_4(aq)$

(3) $HCl(aq)+(NH_4)_2S(aq)\rightarrow H_2S(g)+2NH_4Cl(aq)$

(4) $Mg(s)+Cu(NO_3)_2(aq)\rightarrow Mg(NO_3)_2(aq)+Cu(s)$

Answer :

(1) Precipitation reaction

(2) Neutralization reaction

(3) Double-displacement reaction

(4) Single replacement reaction

Explanation :

(1) The balanced chemical reaction is:

$NaCl(aq)+AgNO_3(aq)\rightarrow AgCl(s)+NaNO_3(aq)$

This reaction is a precipitation reaction in which an insoluble salt formed when two aqueous solutions are combined. The insoluble salt that settle down in the solution is known an precipitate.

(2) The balanced chemical reaction is:

$H_2SO_4(aq)+2LiOH(aq)\rightarrow 2H_2O(l)+Li_2SO_4(aq)$

This is a neutralization reaction in which an acid react with a base react to give salt and water as a product that means it reacts to give a neutral solution.

(3) The balanced chemical reaction is:

$HCl(aq)+(NH_4)_2S(aq)\rightarrow H_2S(g)+2NH_4Cl(aq)$

The given reaction is a double-displacement reaction in which the cation of two reactants molecule exchange their places to give two different products.

(4) The balanced chemical reaction is:

$Mg(s)+Cu(NO_3)_2(aq)\rightarrow Mg(NO_3)_2(aq)+Cu(s)$

This reaction is a single replacement reaction in which the the more reactive element replace the less reactive element.

8 0

3 years ago

True or False Aluminum does not perform well at elevated temperatures

Radda [10]

Answer:

False

Explanation:

7 0

4 years ago

a flight stimulator that helps astronauts prepare for a shuttle launch is an example of a (an) ______.

Dimas [21]

A flight simulator that helps astronauts prepare for a shuttle launch is an example of a Scientific Model.

3 0

4 years ago

Read 2 more answers

describe a general rule for predicting the motion of an object that is being pushed or pulled by unbalanced forces?

7nadin3 [17]

7th grade activities

Force and Motion

(with Work)

2010-2011

Outline of Topics:

1. Describing Motion: Graphing, Speed and Velocity

2. Describing Motion: Changing Velocity

3. Forces, Their Sizes and Direction

4. Force and Mass

5. Its a grave matter: gravity and inertia

6. Weight and Mass

7. All work and no play: Work and Energy

Appendices

1: 7th Grade Vocabulary Related to Force and Motion

2: Motion Detector Directions

3: Day 1 Graphs with Focus Question at the End

4: Day 1 Data Collection Sheet

5: Day 2 Student Problem Sheet

6: Day 2 Second Set of Problems

7: Day 2 Graphs for is the Velocity Changing

8: Day 3 Student Tables with Questions

9: Day 4 Frame for Science Notebook

10: Day 5 Skateboard Prediction and Actual Sheets

11: Day 6 Data Table

12: Day 7 Student Handout

13: Day 7 Force Arrows

14: Day 8 Data Analysis

15: Uncovering Student Ideas in Physical Science probes

16: National Enquirer advertisements

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

18: Directions for converting You Tube videos to another media file

First topic: Describing motion

A three-day exercise

Learning goals

Reviewed from 6th grade (day 1):

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.

New for 7th grade: I can define velocity.

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

Topic Word Bank

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

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

Day 1 Focus Question: What can be learned from different representations of motion?

Materials and Preparation:

For the class:

6 0

3 years ago