CHEMISTRY MIDDLE SCHOOL

What is true about the energy involved in a chemical reaction?

Answers

Answer 1
Answer: The energy needed for a chemical reaction is called the activation energy. This energy is to be present in order for the reaction to happen. This can be achieved by supplying or releasing heat from a system of reactants. This can achieved faster by using a catalyst.

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Used to map mid ocean ridge
Carbon burns with oxygen to produce carbon dioxide gas. Which of these shows the correct chemical reaction?A) CO2 = C + O B) C + O = CO2 C) C+ O -> CO2 D) C, O, CO2
Protons are positively charged and repel other protons. Which other particle is found in the nucleus and separates protons so that the strong force can hold the nucleus together?A) electrons B) neutrons C) protons D) quarks
Easy Question! Chemistry - Please help! I give thanks - It's the picture - Question 2
When there are equal forces from opposite directions acting on an object, the forces are said to be which of the following?PositiveNegativeBalancedGravitational

Define chemical change and give an example

Answers

Definition-A formation of new chemical substances.
Example- Sugar undergoes a chemical change when it is cooked to make caramel. :3

Hope I helped! Sorry if it's bad.
Chemical changes are the chemical properties associated with a specific matter. 

Examples include toxicity, reactivity, stability, flammability, etc. 

Which is the properly balanced equation for the process in which iron oxide (Fe2O3) and carbon monoxide (CO) react to produce iron (Fe) and carbon dioxide (CO2) gas?A.
Fe2O3 + CO → Fe + CO2

B.
Fe2O3 + 3CO → 2Fe + 3CO2

C.
2Fe2O3 + 3CO → 2Fe + 3CO2

D.
3Fe2O3 + CO → 3Fe + 2CO2

Answers

B. Fe2O3 +3CO --> 2Fe + 3CO2 

Fe has 2, Fe2 ---> 2Fe
O has 6, O3 + 3O (3+3=6) ---> 3(O2)(3x2=6) 
C has 3, (3C --> 3C) 

none of the other equations make sense:
In A, Fe on the left has 2 while Fe on the right has 1(so you can eliminate that.)
in C, Fe on the left has 4 (2x2) while Fe on the right has 2.(eliminate this too.)
in D, Fe on the left has 6 (3x2) and Fe on the right has 3 (eliminate this)

which type of heat transfer involve heat flow from hot object to colder object A. convection, but not conduction and radiation B. convection and radiation, but not conduction, convection and conduction, but not radiation D.all of three

Answers

D option is correct. Because heat can transfer in any form. 

You and your friend live in different states and plant identical hydrangea bulbs in your garden. When they bloom, you send each other pictures. You notice that even though you bought the exact same kind of plant, your hydrangea flowers are blue and your friend’s are pink! On a hunch, you each measure the pH of your soil and find that your soil is a little acidic and your friend’s is a little basic. Why do you think the flowers have different colors?

Answers

Since the hydrangeas are changing color depending on whether the soil is acidic or basic, they must have an indicator. This means that any hydrangea planted in acidic soil will have blue flowers and any hydrangea planted in basic soil will have pink. One common indicator present in many plants is anthocyanin, so maybe hydrangeas contain that chemical.

I think the soil has a lot to do with the reason why the flowers have different colors.

Soil

A soil is a mixture of organic matter that supports life. There are 4 types of soil which are sand, silt., clay and loam soil.

A hydrangea flower is affected by the acidity of the soil to influence the color it turns out to be.

The acidic property in the soil used to plant the flower turned it blue,

while The alkaline property in the soil turned the color pink.

Learn more about soil here:

brainly.com/question/13195865

Another gas was used for many years to float transportation balloons. WHICH GAS IS IT:

1) Carbon dioxide
2) Oxygen
3) Hydrogen

Why is this gas not used in balloons today?

Answers

Another gas that was used to fill balloons was hydrogen. The reason why hydrogen is not used today is because it use to cause many fires when it was used to fill balloons up.

Hope I helped you! :)

What is the scientific methodology for conducting experiments? List steps.

Answers

The basic scientific method for conduction an experiment is simple:

(1)Ask a Question
(2)Research and Come up with a Hypothesis
(3)Test Your Hypothesis by Doing an Experiment
(4)Analyze Your Results
(5) Make a Conclusion
(6) Share Your Results

Hope this helps!
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What are chemical properties of water?
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What characteristic do most aquatic plants have in common?A) stems with lots of thorns to fight off predator B) Can survive without sunlight C) Can survive with little water D) Flat leaves for floating in water