Chemistry Middle School

Joey is conducting an experiment in which he measures how far a rubber ball flies when launched at different angles.

Which of the following lab tools will allow Joey to record his results?
A.
a lab journal
B.
a meter stick
C.
a spring scale
D.
a stopwatch

Answers

Answer 1
The tool Joey will need is b. A meter stick
Answer 2

Answer:

A; lab journal

Explanation:

i just did it

Related Questions

WILL MARK THE BRAINLEST

Answers

Answer:

a. Hh, hh

b. hh

c. 50%

d. 50%

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

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

Answers

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

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 ?

Answers

Answer:

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

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