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
Feliz [49]
3 years ago
11

Mei wants to study whether heart rate increases more during certain exercises than during others. She designs an experiment to t

est the heart rates of classmates in the morning and in the evening for three days, immediately after doing jumping jacks, doing push-ups, or running in place. What is the dependent variable in this experiment?
Chemistry
2 answers:
baherus [9]3 years ago
8 0

The change in heart rate is the dependent variable.

postnew [5]3 years ago
7 0
The differing heart rates is the dependent variable. This is because it is dependent on the exercise that will depict the heart rate
You might be interested in
Land breezes near bodies of water occur because
Aleksandr [31]

B) land cools off much faster than water (creating a air region of high density  above land and lower density above sea)

6 0
3 years ago
State the basicity of this acid HCOOH​
Katena32 [7]

Answer:

The basicity of HCOOH (otherwise known as formic acid) is 1

Explanation:

5 0
3 years ago
A common fuel additive that is composed of C, H, and O enhanced the performance of gasoline began being phased out in 1999 becau
spayn [35]

Answer:

C₅ H₁₂ O

Explanation:

44 g of CO₂ contains 12 g of C

30.2 g of CO₂ will contain 12 x 30.2 / 44 = 8.236 g of C .

18 g of H₂O contains 2 g of hydrogen

14.8 g of H₂0 will contain 1.644 g of  H .

total compound = 12.1 out of which 8.236 g is C and 1.644 g is H , rest will be O

gram of O = 2.22

moles of C, O, H in the given compound =  8.236 / 12 , 2.22 / 16 , 1.644 / 1

= .6863 , .13875 , 1.644

ratio of their moles = 4.946 : 1 : 11.84

rounding off to digits

ratio = 5 : 1 : 12

empirical formula = C₅ H₁₂ O

6 0
3 years ago
Consider the following properties: I) The red color of rubies is due to the presence of chromium ions. II) Objects made of silve
quester [9]

Answer:

II) Objects made of silver become tarnished.

Explanation:

Physical properties are the properties which can be observed without changing identity of substance.

Chemical properties are the properties which describe how the substance changes into the different substance completely.

Boiling is an example of physical change in state of the substance. Color is also an example of physical property like boiling point and hence these are constants. The reason of the color is that the chromium ions shows certain colors as the electrons are excited due to absorption of the light. The tarnishing of the silver is an example of the chemical change which occurs due to the reaction of the silver with oxygen. This is also known as corrosion.

5 0
4 years ago
I need a Help plz! It’s my final exam!
LekaFEV [45]
Um i think gold... i think?
7 0
2 years ago
Other questions:
  • If K3PO4= 0.250M, how many grams of K3PO4 are in 750.0ml of solution? Remember that M is the same as mol/L. Answer: 39.8g
    14·1 answer
  • Can someone help me with this​
    8·1 answer
  • How can one kg of iron melt more ice than 1 kg lead at 100 °C
    5·1 answer
  • Which property of gases allows them to be stored at high concentrations in a bottle of air freshener? What changes occur at the
    5·2 answers
  • which law states that the volume of a given amount of gas is proportional to temperature when pressure and number of moles remai
    8·2 answers
  • True or False. Solutions can be heterogenous.
    11·2 answers
  • Choose any metal atom from Group 1A, 2A, or 3A. What charge will it adopt when it ionizes?​
    7·1 answer
  • At a certain temperature the vapor pressure of pure acetyl bromide is measured to be . Suppose a solution is prepared by mixing
    10·1 answer
  • How many moles of ammonium ions are in 125 mL of 1.40 M NH4NO3 solution? ________ moles (give answer with correct sig figs in un
    12·1 answer
  • There are 31.1 grams (g) in 1 troy ounce (ozt). How many ozt of gold are extracted from 1 short ton of average Nevada ore
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!