Chemistry Middle School

I'm gonna try this for the last time. Who wants to write a book with me?

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Answer 1

Answer:

me <3

Explanation:

Related Questions

please help!

a b c or d

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Answer:

A glass pane / A.

Explanation:

Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air. The division of materials into the categories of conductors and insulators is a somewhat artificial division.

Answer:

the answer is A

Explanation:

Choose any electromagnetic wave we have discussed and write ONE PARAGRAPH telling me about the uses/benefits of that electromagnetic wave.

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Answer:

UV Rays

Here are some points you can add

•used to sterilise equipment from microbacterial organisms

•used to create fluorescence mechanism

•used to purify air

•used to tenderize meat

•can be implemented in medical and dental practices

•water purification

•stimulates vitamin d production

How does the light from a flashlight that is shone from two different distances model the apparent magnitude of two stars with the same absolute magnitude ?

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Answer:

With the distance allowing us a conversion from one to the other. Two stars can have the same apparent magnitude, but different absolute magnitude, if we measure the same amount of light from them, but they're at a different distance from the Earth.

Explanation:

HELPPP this is a k12 so any links or false with be blocked or banned

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Answer:

Sea level rise is caused by several different processes, including melting ice. But one big contributor to sea level rise is increasing global temperatures, which heat seas and cause something called thermal expansion of water. Thermal expansion happens when water gets warmer, which causes the volume of the water to increase. About half of the measured global sea level rise on Earth is from warming waters and thermal expansion.

Explanation:

I hope this helps

Scientists can use many strategies during investigations, including heldwork, surveys,
models, and experiments. Which of these phrases best describes an experiment?
A mathematical analysis of data
B. observation of animals in their natural world
Ci collection of data from an uncontrolled environment for comparative purposes
D. procedure with controlled conditions and test and outcome variables

Answers

Answer:

D

Explanation:

Question: Scientists can use many strategies during investigations, including heldwork, surveys,

models, and experiments. Which of these phrases best describes an experiment?

A mathematical analysis of data

B. observation of animals in their natural world

Ci collection of data from an uncontrolled environment for comparative purposes

D. procedure with controlled conditions and test and outcome variables

plz helppppppppp meeeeeeeeeeeeeeee

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4. Obsidian - rapid cooling when lava flows into water.

Granite - very slow cooling such as what occurs when magma is trapped beneath Earth's surface.

Basalt - cooling when lava flows over land

5. They are slightly simplistic and rock formation is not limited to only these methods.

6. They give a general overview of how a certain type of rock may be formed and how to identify them from a basic level based on their location.

Students in a chemistry class added 5 g of Zinc (Zn) to 50 g of hydrochloric acid (HCl). A chemical reaction occurred that produced zinc chloride (ZnCl2) and 6 g of hydrogen gas (H2).

Zn+ 2HCl → ZnCl2+H2

What is the mass of the zinc chloride?

Answers

Answer: 11 g

Explanation:

Zn + 2HCl    →   ZnCl₂ + H₂

Number of moles of Zn:

Number of moles = 5 g / 65.38 g/mol

Number of moles = 0.08 mol

Number of moles of HCl :  

Number of moles = 50 g / 36.5 g/mol

Number of moles = 1.4 mol

Compare the moles of both reactant with zinc chloride:

             Zn             :           ZnCl₂

              1             :             1

             0.08       :        0.08

           HCl          :         ZnCl₂

             2            :           1

            1.4          :         1/2×1.4 =0.7 mol

The number of moles of zinc chloride produced by Zn are less so it will limit reactants.

Mass of zinc chloride:

Mass = 0.08 mol × 136.3 g/mol

Mass = 11 g

The answer is 11
First you need to find the limiting reactant
n (Zn) = m/MM = 5/65.38 = 0.076 ≈ 0.08
ratio = moles/coefficient = 0.08/1 = 0.08

n(HCl) = m/MM = 50/36.45 = 1.37
ratio = moles/coefficient = 1.37/2 = 0.685

So the limiting reaction is Zn

0.08/1 = x/1
x= 0.08 moles of ZnCl2

Then u need to find the mass
m= n(MM) = 0.08 (136.28) = 10.9 ≈11

question #5: corals are sensitive to temperature . if temperatures are raised , it will cause the coral to bleach . what does bleach mean ? And can corals recover ?

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Answer:

It means the coral will turn white and corals may recover (depending on the species) by soaking up ocean surface heat.

WILL MARK THE BRAINLEST

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Answer:

a. Hh, hh

b. hh

c. 50%

d. 50%

C I think but if I’m wrong I’m really sorry

Create a 10 question test to assess important topics on weathering, erosion and deposition. you may make multiple choice, fill in the blank and open ended questions. provide the right answers to assist you.

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Answer:

Sorry i dont know the answers :(

Explanation:

Pls dont report me

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