14. A researcher Is curious to find out what effect classical music has on people's level of relaxation
(as measured by heart rate). She suspects that listening to classical music will make people feel
more calm and relaxed. The researcher lets one group listen to classical music for one hour and
then do a relaxing activity, like reading or drawing for another hour. She lets the other group sit in a
qulet room for two hours (they hear no music). After two hours, she monitors the heart rate of each
participant to measure their level of relaxation.
What is the error in thls experiment design?
A. There are two independent variables: classical music and an additional relaxing activity
B. There are two independent variables: the amount of time and heart rates
C. There are two dependent variables: classical music and an additional relaxing activity
D. There are two dependent variables: the amount of time and heart rates

Answers

Answer 1

Answer:

It should be "B"

Explanation:

:) :) :) :) :) :)


Related Questions

when is light produced during e- configuration

Answers

when electrons return to lower energy levels
Babe jsjdj jdjrjjr jsjke e sjjsnebe. Jake

True or False, plz don't answer if you don't know the correct answer ​

Answers

Answer:

The answer is true

Explanation:

Hope this can help

Any two difference between short sightedness and long sightednes​

Answers

Explanation:

tala it is also called myopia lekhnu hai

Äni Arko MA it is also called hypermetropia .

pls asap figure it out pls I will mark brainliest​

Answers

Answer:

NaCl (Na is a metal and Cl is a nonmetal) MgO (Mg is a metal and O is a nonmetal) Al2O3, NaF, Na2O

Explanation:

You have to have a metal and a non metal together for it to be ionic

How many moles are present in 5.24 x 1023 molecules of CH4?

Answers

Answer:

0.807 moles

Explanation:

No of molecules = No of mole × Avogadro's number

No of mole = No of molecules / Avogadro's number

No of mole = 5.24×10^23/6.02×10^23

0.870 moles

You have a stock solution of HNO3 with a concentration of 4.5 x 10^-4 M. However, you need 275 ml of a 2.50 x 10^-5 M solution. How much of the stock solution will you need?

Answers

Answer:

15.28 mL

Explanation:

From the question given above, the following data were obtained:

Molarity of stock solution (M₁) = 4.5x10¯⁴ M

Volume of diluted solution (V₂) = 275 mL

Molarity of diluted solution (M₂) = 2.5×10¯⁵ M

Volume of stock solution (V₁) needed =.?

The volume of the stock solution needed can be obtained by using the dilution formula as illustrated below:

M₁V₁ = M₂V₂

4.5x10¯⁴ × V₁ = 2.5×10¯⁵ × 275

4.5x10¯⁴ × V₁ = 0.006875

Divide both side by 4.5x10¯⁴

V₁ = 0.006875 / 4.5x10¯⁴

V₁ = 15.28 mL

Therefore, the volume of the stock solution needed is 15.28 mL

What is the percent composition of Phosphorus in Li3PO3

Answers

Answer:

you will get 17.983 g of lithium for every 100 g of lithium phosphate.

Explanation:

69.7%  is the percent by mass of Lithium in  Li[tex]_3[/tex]PO[tex]_3[/tex]. A percent is obtained by multiplying the result by 100.

One approach to show the concentration for an element within a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total weight of the combination by the mass of each component and multiplying the result by 100%. The mass percent is calculated by dividing the mass that contains the compound and solute by the mass for the element or solute.

99.795g/mol = molar mass of  Li[tex]_3[/tex]PO[tex]_3[/tex]

6.94g/mol = molar mass of Li

mass percentage of Li=(molar mass of Li/molar mass of Li[tex]_3[/tex]PO[tex]_3[/tex])×  100

=(6.94/99.7)×  100

=69.7%

To know more about mass percentage, here:

brainly.com/question/32197511

#SPJ6

Could someone pls help me if you know it!!

Answers

Answer:

Beautiftul, begging under F

honest, beginning in thrid line under A

hopeful, fifth line under F

Explanation:

help me with cience for brainest:) its easy:)

Answers

Answer:

Stronger

And its science

Explanation:

Answer:

stronger for top.

weaker for bottom.

passed all sciences in freshman year :D

Newton's first law of motion explains how
affects an object's motion. According to
Newton's first law, an obiect at rest will stay at

Answers

Answer:

rest until and unless an external force is applied.

18. Which statement about photosynthesis is FALSE?
a
Tilmy green pigment chlorophyll captures light
energy
b Oxygen is needed as a reactant to produce
glucose
The process converts light energy from the
csun into chemical energy in the bonds of
glucose.
d
Carbon dioxide is needed as a reactant to
produce glucose.

Answers

your query :

Which statement about photosynthesis is FALSE?

Answer:

b. Oxygen is needed as a reactant to produce

glucose is the incorrect statement here

Explanation:

plants uses simple raw materials to prepare their food , which includes water ( H2O ) and Carbon dioxide ( CO2 ).

and traps sunlight by Green pigments known as chlorophyll and stores these energy in bonds of glucose molecules

so ,

after this reaction glucose and oxygen is formed as products

● hence we conclude that Oxygen is not needed as a reactant to produce glucose , oxygen is the bi product formed during photosynthesis.

what water has 97% of water

Answers

Answer:

ocean

Explanation:

because its easy

The answer would be Ocean

No one answers my Questions :(
Please help its my last one:

Name three sources of atmospheric carbon dioxide. (Write in complete sentences and be very detailed.)
This is science.
First and best answer gets 5 stars, a thanks, and a brainliest!

Answers

Doing this because I know I'm kickass at Chemistry.

One source would be human emissions. As humans, we use a lot of machines (like power plants) that produce large amounts of carbon dioxide into the atmosphere. The ocean also produces a lot of carbon dioxide via the evaporation cycle. Polluted waters eventually will go into the atmosphere. Volcanoes, even when not erupted, emit a lot of carbon dioxide as well. Dormant underground magma releases carbon dioxide through the Earth's pores, and even when a volcano erupts, it produces carbon dioxide as well.

Someone please answer this...

Answers

Answer:

5446.8 J

Explanation:

From the question given above, the following data were obtained:

Mass (M) = 50 g

Initial temperature (T₁) = 70 °C

Final temperature (T₂) = 192.4 °C

Specific heat capacity (C) = 0.89 J/gºC

Heat (Q) required =?

Next, we shall determine the change in the temperature. This can be obtained as follow:

Initial temperature (T₁) = 70 °C

Final temperature (T₂) = 192.4 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 192.4 – 70

ΔT = 122.4 °C

Finally, we shall determine the heat required to heat up the block of aluminum as follow:

Mass (M) = 50 g

Specific heat capacity (C) = 0.89 J/gºC

Change in temperature (ΔT) = 122.4 °C

Heat (Q) required =?

Q = MCΔT

Q = 50 × 0.89 × 122.4

Q = 5446.8 J

Thus, the heat required to heat up the block of aluminum is 5446.8 J

WHICH OF THE FOUR COMPOUNDS HAS BONDS WITH THE GREATEST DEGREE OF POLARITY (MOST POLAR)?

Answers

Answer:

I NEED TO KNOW THIS TOO

Explanation:

IVE BEEN LOOKING FOR THE ANSWER


What is the molecular formula of a compound that is 51.02 % carbon, 13.80 % hydrogen, and 35.18 %
oxygen? The molecular mass is 88.0 g/mol.

Answers

Answer:

Molecular formula = C₄H₁₂O₂

Explanation:

Given data:

Percentage of hydrogen = 13.80%

Percentage of carbon = 51.02%

Percentage of oxygen = 35.18%

Molecular formula = ?

Solution:

Number of gram atoms of H = 13.80 / 1.01 = 13.6

Number of gram atoms of O = 35.18 / 16 = 2.2

Number of gram atoms of C = 51.02 / 12 = 4.25

Atomic ratio:

            C                      :      H             :         O

           4.25/2.2           :     13.6/2.2     :       2.2/2.2

            2                      :        6          :        1

C : H : O = 2 : 6 : 1

Empirical formula is C₂H₆O.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass = C₂H₆O = 46 g/mol

n = 88 / 46

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₂H₆O)

Molecular formula = C₄H₁₂O₂

9. How long will it take 120 grams of Strontium-90 to decay to 7.5 grams?
with steps pls​

Answers

Answer:

116 years

Explanation:

To solve this, we will use the half life equation;

A(t) = A_o(½)^(t/t_½)

Where;

A(t) is the amount of strontium left after t years;

A_o is the initial quantity of strontium that will undergo decay;

t_½ is the half-life of strontium

t is the time it will take to decay

We are given;

A(t) = 7.5 g

A_o = 120 g

From online values, half life of strontium-90 is 29 years. Thus, t_½ = 29

Thus;

7.5 = 120 × ½^(t/29)

Divide both sides by 120 to get;

7.5/120 = ½^(t/29)

0.0625 = ½^(t/29)

In 0.0625 = (t/29) In ½

-2.772589 = (t/29) × (-0.693147)

(t/29) = -2.772589/(-0.693147)

t/29 = 4

t = 29 × 4

t = 116 years

what is the charge on a calcium (Ca) atom that contains 18e?

Answers

Answer:

Ca2+

Explanation:

the charge on a calcium (Ca) atom that contains 18e is 2+

What is true about a chemical reaction

Answers

Answer: energy is transferred, but it can go to the products or the reactants.

Explanation: in a chemical reaction, the atoms and molecules that interact with each other are called reactants.

A chemical equation summarizes a reaction. ... All the atoms present at the start of a reaction are present at the end. true.

"You learned about mixtures, especially solutions and the factors that affect their makeup and properties. Why is it important to know the properties of both solutes and solvents when preparing a solution that is expected to meet a certain need?
Does this involve a chemical change or a physical change? Explain."

Can u pls help me

Answers

Answer:

its due to the solvents being factored. to be prepared for the solution you would need a chemical change as the solvents get factored so this will mean that it will have a chemical reaction. in this case its slightly different so it will be called a chemical change as 2 different chemicals change and evolve.

Explanation:

what is the temperature in the fahrenheit?

Answers

A or c but I think it’s a.
The correct answer would be a

The photo shows wires made of pure copper, an element
What would the smallest piece of copper be?
A. Copper atom
B. Mixture of different kinds of metallic elements
C. Copper molecule
D. Compound containing two or more elements

Answers

Answer:

B

Explanation:

I hope its right. I'm pretty sure.

Answer:

Explanation:

Copper Atom

which personal trait do scientists mainly depend upon when they design an experiment

Answers

Answer:

creativity is the personal trait that scientists mainly depend upon when they design an experiment.

Why does forming bonds release energy? *

Answers

Bonds are stable configurations of (relative) minimal energy. So when entering a bond the combined energy level of the contributing atoms is being reduced to a local minimum. That way “free energy” is released that shows as heat or radiation (e.g.) in the environment.

I've decided that i still want to have some orange juice

Answers

Answer:

Oh thats great..

But I hate juice :(

How can mutations occur in cells? Submi Save and Exit Next Mark this and return​

Answers

by rounding them to the neerest 10


Please select the word from the list that best fits the definition.

Science lab, bring water and sodium

a) term calendar

b) weekly schedule

c) daily organizer

Answers

Answer:

C. Daily Organizer. Also called an agenda. We usually write notes in them for school related things so the answer is pretty self explanatory.

Yep C we did this before in class

Hope it helps —-xoxo

Give two limitations of law of Constant Composition​

Answers

Answer:

1.The law does not hold true if the different isotopes of the element are involved in making chemical compound.

2.The law is not applicable when elements combine in the same ratio but different compounds are formed.

what is tetra atomic molecules?

Answers

Answer:

Explanation:

They are the molecules that are formed when four atoms chemically bond together.

An tetra atomic molecule is a 1 : consisting of four atoms : having four atoms in the molecule. 2 : having four replaceable atoms or radicals.

A student is drinking a cup of hot chocolate as they sit by a campfire on a chilly evening. They know that the cup of hot chocolate transfers thermal energy to the surrounding air. The heated air over their cup of hot chocolate expands and rises and is replaced by cooler, denser air.
This method of energy transfer is —

Answers

Answer:

A student is drinking a cup of hot chocolate as they sit by a campfire on a chilly evening. They know that the cup of hot chocolate transfers thermal energy to the surrounding air. The heated air over their cup of hot chocolate expands and rises and is replaced by cooler, denser air.

This method of energy transfer is

Explanation:

Answer:

radiation

Explanation:

radiation is when an existing heat source spreads heat to its surroundings

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Which populations are least affected by density-dependent factors? Please answer correctly !!!!!!!! Will mark Brianliest !!!!!!! And show your work !!!!!!!!!!!!!!!!! What two patterns is in the table show a quadrilateral has 2 angles that measure 100 and 60 degrees the other angles have a ratio of 3:17 . what are the measures of those angles? colin buys a tv for 780. It depreciates at arate of 5% per year. how much willit be worth in 6 years Now that you have worked through a lot of material that includes these basic patterns, and you have compared grammatically correct and incorrect sentences, write down what you think is a rule that could explain what makes a sentence grammatically correct or not. For example, you might write something like: "verbs always match nouns in number, and they usually come before the noun." In other words, make your best guess for the grammar rule that makes sense out of the pattern(s) you see in the phrases you have been working with. Review if you need to, and you might briefly check your hunches against the sentences you have been working with in this or previous modules. Keep in mind that what you're after is your hunch, not a grammar rule from a text book. Now check your hunch with the explanation of this principle in the following pattern. Question 4 (1 point)Thomas Jefferson passed the Embargo Act in 1807. What was the purpose?6Hurryyyy HELP WITH MATH PLSSSSSSSSSSSSS A common question you'll need to answer is "What is the relationship between the independentvariable) and (the dependent variable)?" In other words, as you change the variable that you'retesting, what is the outcome?- So in this case, what is the relationship between time and the diameter of the trees?HELP PLZZZZZ What is the predicate (verbs only) of the following sentence? Jorgi researched and wrote that speech. how do i use the substitution method for these equationsy=3x+4y=5x+12 If it takes a force of 60 Newtons to move an elephant, then a person who supplies a force of 70 Newtons will be able to move it. options: True False A quadratic equation has a vertex located at (3,-2). What is the axis of symmetry? WILL GIVE BRAINLIEST PLS HELPAn action figure is 5 inches tall. If the toy company modeled the action figure off of a TV star that is 6 feet 3 inches tall. What ratio did they use?A. 15 inches = 1 inchB. 14 inches = 1 inchC. 14.4 inches = 1 inchD. 1.6 inches = 1 inch Alright here is another question Alexi's restaurant bill is $58, and he wants to leave a 20 percent tip. Which expression represents the total amount thatAlexi needs to pay?O $58(0.20) + $58O $58(0.20)O $58(20) + $58O $58(20) What is the context for the death of Romeo and Juliet? Entrepreneurs affect the economic decisions a country makes by:A. convincing societies to give up their most expensive wantsB. producing useful goods regardless of their demands or scarcityC. earning consistent salaries that make the economy more stableD. identifying new ways for people to fulfill their wants and needs when is light produced during e- configuration Please Help :))Find the value of x in each pair of similar figures