1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Umnica [9.8K]
3 years ago
13

How many variables are there in science

Chemistry
1 answer:
Sedaia [141]3 years ago
7 0
There are three variables independent, dependent ,and controlled
You might be interested in
An arrow is moving at 35m/sand travels for 5 seconds.how far did the arrow travel?
docker41 [41]

Answer:

175 meters

Explanation:

As it's velocity is 35m/s

so,

by formula

35 *5

175 meters

8 0
3 years ago
Are there chemical reactions happening in our home
White raven [17]
Yes, remember a chemical reaction is whenever one or more substances combine together to form a different substance. So whatever you put together and form something new is called a chemical change/reaction. Examples such as rusting of Iron, expired milk(going sour), Baking cake and many more to think about
Hope it helps
4 0
3 years ago
What is Y? 222/86 Rn A/z + 4/2He
kondaur [170]

^{222}_{\phantom{2}86}\text{Rn} \to ^{218}_{\phantom{2}84}\text{Po}+ ^{4}_{2}\text{He}

Y is Po-218.

  • A = 218
  • Z = 84.
<h3>Explanation </h3>

^{222}_{\phantom{2}86}\text{Rn} \to ^{A}_{Z}\text{Y}+ ^{4}_{2}\text{He}

Here's the symbol of a particle in a nuclear reaction. ^{A}_{Z}\text{Y}.

A stands for mass number. Z stands for atomic number. Both numbers shall conserve in a nuclear reaction.

  • The mass number on the left hand side is 222.
  • The two mass numbers on the right hand side add up to A + 4.
  • 222 = A + 4.
  • A = 218

So is the case for the atomic number. Try figure out the atomic number of Y using the same approach.

  • The atomic number on the left hand side is 86.
  • The two atomic number on the right hand side add up to __ + __.
  • 86 = __ + __.
  • Z = 84.

What element is Y? The atomic number of Y is 84. Refer to a periodic table. Element 84 corresponds to Po (polonium). Y is Polonium-218. The symbol of Y should be written as ^{218}_{\phantom{2}84}\text{Po}. Hence the equation:

^{222}_{\phantom{2}86}\text{Rn} \to ^{218}_{\phantom{2}84}\text{Po}+ ^{4}_{2}\text{He}.

3 0
2 years ago
Plz help with any you can !!!!!
EleoNora [17]
Number 1 is c. because objects reflect light we see it.
8 0
3 years ago
Read 2 more answers
Why is glycolysis considered by evolutionary theory to be one of the first metabolic pathways to have evolved?
Levart [38]
This is because it is found in the cytosol, does not involve oxygen, and is present in most organisms.

<em>Hope this helped! :)</em>
3 0
3 years ago
Read 2 more answers
Other questions:
  • How do you find the volume of a liquid
    14·1 answer
  • Which activity might help to increase the validity of this experiment?
    15·1 answer
  • What material would be the best choice for the support beams of a building
    14·2 answers
  • Which of the following is true of a gas?
    11·1 answer
  • What does the term chemistry mean?
    8·1 answer
  • What properties do atoms of the same element share? Select all that apply.
    10·2 answers
  • Explain the relationship between forward and reverse
    15·1 answer
  • A gas has a volume of 240.0mL at 25.0 oC and 0.79 atm. Calculate its volume at STP (1 atm and 0 oC).
    14·1 answer
  • Find the percent composition of water in barium chloride dihydrate. Round your answer to the
    9·1 answer
  • Fill in the blank in order to complete the path for pollen as it fertilizes a plant:anther → stigma --&gt; style → _____________
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!