CHEMISTRY MIDDLE SCHOOL

Which device directly converts chemical energy into electrical energy?1) solar-powered calculator
2) wood-burning stove
3) battery-powered flashlight
4) wind-powered sailboat

Answers

Answer 1
Answer: number three is correct because the battery in the flashlight is made of chemicals and when you turn the flashlight on it turns into electrical. hope this helps.

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A white powder is added to a solution. The images show observations made before the powder is added, just after the powder has been added, and a little while later. (The liquid in the small beaker is phenol red solution.) What evidence shows that a chemical change has taken place?

Write a balanced equation for double replacement of KOH+ZnCl2

Answers

Answer :

Double replacement reaction : It is a type of reaction in which a positive cation and a negative anion of the reactants react to give a new compound as  a product.

AB+CD\rightarrow AD+CB

In this, A and C are the cations and B and D are the anions.

When one mole of potassium hydroxide react with the one mole of zinc chloride to give one mole of zinc hydroxide and 2 moles of potassium chloride.

The balanced chemical reaction is,

KOH+ZnCl_2\rightarrow Zn(OH)_2+2KCl

Why is the collision theory considered to be well-established and highly reliable?

Answers

BECAUSE IT NEVER BREAKES

Which of the following is not part of Dalton's atomic theory?

Answers

The scientist thought that the atom was the smallest particle in the universe is John Dalton. He established the atomic theory which consists of five; elements are made of extremely small particles called atoms, atoms of different element have different sizes, mass and physic – chemical properties, atoms cannot be divided further, destroyed or created, atoms can combine to form compounds and in chemical reaction, atoms can be combined, separated or rearranged.

Answer:

all atoms of one type were identical in mass and properties

Explanation:

If volume is increased, the number of collisions per second... decreases or increases?

Answers

Answer:

if volume is increased, the number of collisions per second decreases.

Explanation:

volume is inversely proportional to pressure. Increase in volume leads to decrease in pressure and decrease in volume leads to increase in pressure.

if the pressure is high, it leads to increase in the number of collisions. If the pressure is low, it leads to decrease int he number of collisions.

therefore since volume is inversely proportional, when volume is increased, the pressure decreases and thus the number of collisions decreases.

How are revolution and year related

Answers

Revolution means orbiting around another body. 
A year is a time for a planet to complete one orbit around the Sun.

Explanation:
The words revolution and year are connected as a result of a revolution. The definition of a revolution is that the movement of 1 object around a middle or an in a very given length of your time which may be measured in terms of years. and year may be a peroid or length of twelve month within which the eart revovle round the sun.
Revolution means orbiting around another body. 
A year is the time for a planet to complete one orbit around the Sun.

methane is a flammable compound made of carbon and hydrogen atoms. how could you seperate the carbon and hydrogen in methane

Answers

As we know methane is an Alkane to separate an Alkane We use fractional distillation to put each liquid into its fraction with the right temperature group
Other Questions
Jordan is doing a science fair project on the effect of music on the growth of tomatoes. He has two tomatoe plants,plant A and plant B, that he grows in a window and gives that same amount of water.plant A is exposed to classical music using headphones attached to the soil. Throughout the growth period, Jordan counts the number of tomatoes produced by each plant.What is the control group?What is the independent variable?What is the dependent variable?What should jordan's conclusion be?Jordan need to repeat this experiment, what should he do differently?
What is 9.72 moles of Cl atoms to grams? Showwork please!
What is the number that you never write as a subscript?
Please help I'm soo confused, it's okay if one or two questions are incorrect.. I just need it finished. thank you so much