CHEMISTRY MIDDLE SCHOOL

Daniel observed and compared some stars at night and recorded his observations in a chart.Daniel later discovered that star X is farther away from Earth than the other stars he observed, and star Z is closest to Earth.

Which conclusion is best supported by Daniel’s observations and discoveries?

Star X is more luminous than both stars Y and Z.
Star X is more luminous than star Z, but not star Y.
Star Y is more luminous than star X.
Star Z is more luminous than star Y.


PLEASE HELP

Answers

Answer 1
Answer:

Answer:

The Answer is A) Star X is more luminous than both stars Y and Z.

Explanation:

it just is

Answer 2
Answer:

Answer: A. Star X is more luminous than both stars Y and Z.

Explanation: Edge 2021

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Which of the following statements is true?1. Dalton believed atoms were made mostly of empty space. 2. Plasmas have a net negative charge. 3. The number of protons in an element is always equal to the number of neutrons. 4. Solids have a fixed mass, volume, and shape.
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How many moles of HCl are present in 0.70 L of a 0.33 M HCl solution?a
0.23 mol
Ob
0.38 mol
0.28 mol
Od
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Answers

Answer:

0.23 mol

Explanation:

A ph less than 7 is an ___, with ____ numbers indicating stronger acids.

Answers

Answer:

A pH less than 7 is an acid, with number 1 indicating stronger acids

Explanation:

The pH scale has a range of 1 to 14. The following has been concluded on the pH scale:

1. Between 1 and 6 indicates an acid solution.

2. 7 indicates a neutral solution

3. Between 8 and 14 indicates an alkaline or basic solution.

Now with these information, we can answer the above questions as follow:

A pH less than 7 is an acid, with number 1 indicating stronger acids

Final answer:

A pH less than 7 is an acid. Lower pH values mean stronger acids.

Explanation:

A pH less than 7 is considered an acid. The pH scale measures the concentration of hydrogen ions in a solution, therefore a lower number on the scale indicates a higher concentration of hydrogen ions and consequently a stronger acid. For example, lemon juice, with a pH of around 2, is much more acidic than black coffee, which has a pH of about 5.

Learn more about pH and acidity here:

brainly.com/question/37003538

#SPJ3

A scientist takes a small, partially inflated balloonout of liquid nitrogen (at a very low temperature).
As the balloon rests on the table, it begins to grow
in size. Which statement(s) best explains why the
balloon grows?

The air from the outside comes inside the
balloon. More air means more volume.
The air warms and increases particle
movement. Increased particle movement
leads to increased volume.
side
o
Increased temperature means increased
volume as long as the container is flexible.

Answers

Answer: option 2 and 3

Explanation:

I just did it

Answer:

The last two

Explanation:

edge2021

What happens when you mix acid and base?

Answers

Acids are chemicals with a pH less than 7 that can donate a proton or H+ ion in a reaction. Bases have a pH greater than 7 and can accept a proton or produce an OH- ion in a reaction. If you mix equal amounts of a strong acid and a strong base, the two chemicals essentially cancel each other out and produce a salt and water. Mixing equal amounts of a strong acid with a strong base also produces a neutral pH (pH = 7) solution. This is called a neauturization and looks like 
HA + BOH → BA + H2O + heat

A chemical reaction by definition forms new chemicals (called the products) from the initial chemicals (called the reactants). It should make sense that the identity of the products formed depends on what reactants we start with. Adding an acid to a base is an example of a chemical reaction, so we should expect to see new products. Although there is a pattern to this type of reaction, ultimately the products formed depend on what acid and what base are used.

I hoped I helped

In structure, the standard (Bohr) model of the atom is most similar to A: plum pudding

B: our solar system

C: chocolate chip cookie
dough

D: the Milky Way galaxy

Answers

A. Plum Pudding

This is also a simple google search

What type of rock does preexisting rock become

Answers

Metamorphic rock is a type of rock that the preexisting rock becomes a new rock.
Metamorphism has also different types; the Contact metamorphism and the regional metamorphism. Contact metamorphism happens when magma is mixed with the solid rocks in the surroundings. For example when magma is starting to form igneous rock, it may increase that probability that it will reach the country’s rock and that’s affected the current formation of the rock. Regional metamorphism is also called as dynamic metamorphism. This happens when the pressure from underground makes the rock from above move and change into new rock formation

Clastic because clastic sedimentary rocks are made up of pieces of pre existing rocks

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