CHEMISTRY MIDDLE SCHOOL

What are cathode rays made of

Answers

Answer 1

Answer:

Answer:

electrons

Explanation:

they are composed of negatively charged particles also known as electrons

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During which of the following phases of the moon do we see the left half of the moon as lit? Full moon
First quarter moon
Gibbous moon
Third quarter moon

Any help is greatly appreciated!! :)

Answers

Answer:

The answer is: Can be first quarter moon or third quarter moon.

Explanation:

At first quarter moon and at third quarter moon we can see exactly half of the moon lit up. But, it depends on the place in the planet where you are, which side of the moon you see lit up in which stage of the moon. In the north, the left part of the moon is lit up in third quarter, while in the south is the righ part. An the same for the first quarter, where de right half of the moon is lit up for the north and for the south it is the left. So, the real answer is: For the north part of the world, it will be at third quarter, and for the south part, it will be at first quarter.

The left is seen when the moon is at the third quarter phase

Calculate the mass of barium sulphate formed when 500 cm3 of 1 mol dm sodium sulphate solution is reacted completely with barium chloride solution.[ Relative atomic mass : O = 16; S = 32; Ba = 1371

Answers

Answer:

116.69 g.

Explanation:

Let's write down the reaction taking place when barium chloride reacts with sodium sulfate. This is a double displacement reaction, meaning the anions will be exchanged to produce barium sulfate and sodium chloride:

$BaCl_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2 NaCl(aq)$

Let's find the moles of sodium sulfate. Given the volume of:

$V_(Na_2SO_4)=500 cm^(3)$

Convert this to milliliters knowing that:

$1 mL = 1 cm^3$

Therefore:

$V_(Na_2SO_4)=500 cm^3\cdot (1 mL)/(1 cm^3) =500 mL\cdot(1 L)/(1000 mL) =0.500 L$

Also, we know that:

$1 dm^3 = 1 L$

Convert the molarity into mol/L:

$1 (mol)/(dm^3)\cdot (1 dm^3)/(1 L)=1 (mol)/(L)$

Multiply molarity by volume to find moles of sodium sulfate reacted:

$n_(Na_2SO_4)=1 (mol)/(L)\cdot0.500 L=0.500 mol$

According to stoichiometry of the equation, 1 mole of sodium sulfate produces 1 mole of sulfate, so 0.500 mol of sodium sulfate produce 0.500 mol of barium sulfate. That said, we have moles of barium sulfate produced. To find mass, let's multiply this amount of moles by the molar mass of barium sulfate:

$m_(BaSO_4)=0.500 mol\cdot233.38 (g)/(mol) =116.69 g$

How would you expect energy to change during a chemical reaction? A) Energy will be increased
B) Energy will be converted into another form
C) Energy will be consumed
*THIS IS NOT PART OF A TEST, I GOT THE ANSWER WRONG AND WANT TO KNOW THE RIGHT ONE*

Answers

B. The energy will be converted into another form. In chemical reactions energy is usually changed to heat or light energy. This is an example of the First Law of Thermodynamics which states that energy can not be created or destroyed.

Sound molecules can "stack up" in front of airplanes traveling at very highspeeds. This can cause which of the following?
A. Subsonic speeds
B. Fire
C. A combustion reaction
D. Sonic booms

Answers

The answer is C a combustion’s reaction

the answer is B.......

Sodium inside a star is most likely formed by which process?fusion

beta emission

alpha emission

fission

Answers

Answer: A: fusion

Ex:

Susana heats up a sample of red crystals. While the sample is being heated, a gas is released and a blue powder is left after the heating. Is the sample of red crystals an element or a compound? Explain your answer.

Answers

Answer:

Susana's red crystal sample is a compound because it was broken down into a gas and blue powder. It is not an element because elements cannot be broken down into simpler substances by ordinary means, such as heating.

Explanation:

Final answer:

The red crystals heated by Susana are a compound because they released a gas and turned into a blue powder when heated, indicating a chemical change.

Explanation:

The sample of red crystals that Susana heated up is a compound, not an element. We can come to this conclusion because when the sample was heated, a gas was released and a different substance, a blue powder, was left behind.

This indicates a chemical change had occurred, where the original substance decomposed into different substances. Compounds are known to break down into simpler substances or elements under certain conditions.

An example similar to this would be when blue copper sulfate loses water and becomes white upon heating, or when mercury(II) oxide is heated and decomposes into mercury and oxygen.

Learn more about Compound Identification here:

brainly.com/question/30758273

#SPJ3

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