Select the correct answer.
Why is it important for scientists to keep testing a hypothesis even after they’ve found it to be true?

A.
Repeated tests help determine whether the hypothesis is always true in different circumstances.
B.
Experiments are rarely accurate, so it’s important to keep testing a hypothesis.
C.
Scientists can learn experimental procedures through repeated testing of a hypothesis.
D.
Repeatedly testing a hypothesis qualifies it to be accepted as a theory.

Answers

Answer 1

Answer:

B. Experiments are rarely accurate, so it’s important to keep testing a hypothesis.

Explanation:


Related Questions

Atoms are the smallest unit of an element that holds the physical identity of that element. T or F

Answers

Answer:

True

Explanation:

True
Explanation
True

Which organism dna will differ the most from the leopard

Answers

Answer:

Lancelet

Explanation:

This is because a Lancelet is a small elongated marine invertebrate that lacks all of the physiological and biological traits of a leopard

what type of forces are unequal forces that cause a change in an object's motion such as speed or direction

Answers

Answer:

Unbalanced forces are not equal, and they always cause the motion of an object to change the speed and/or direction that it is moving.

Explanation:

When two unbalanced forces are exerted in opposite directions, their combined force is equal to the difference between the two forces.

The magnitude and direction of the net force affects the resulting motion

This combined force is exerted in the direction of the larger force

For example, if two students push on opposite sides of a box sitting on the floor, the student on the left pushes with less force (small arrow) on the box than the student on the right side of the box (long arrow).

The resulting action (net force: smaller arrow to the right of the = shows that the box will change its motion in the direction of the greater force

If unbalanced forces are exerted in the same direction, the resulting force (net force) will be the sum of the forces in the direction the forces are applied.

When forces act in the same direction, their forces are added. When forces act in opposite directions, their forces are subtracted from each other.

Unbalanced forces also cause a nonmoving object to change its motion

If there is no net force acting on the object, the motion does not change. If there is a net force acting on an object, the speed of the object will change in the direction of the net force.

Calculate the number of copper atoms in a 63.55 g
sample of copper.​

Answers

Answer:

there are N_A, "Avogadro's number" of copper atoms in a 63.55*g mass of copper wire. And N_A, "Avogadro's number" = 6.022xx10^23 individual copper atoms. I look on the Periodic Table, and at Z=29, i.e. copper, the quoted atomic mass is 63.55*g.

Explanation:

One mole of every substance contains 6.022×10²³ atoms. The atomic mass of copper is 63.55 g. Thus it is one mole of copper which contains copper 6.022×10²³ atoms.

What is copper?

Copper is 29th element in periodic table. It is a transition metal classified into d-block. Transition metals are named so because they in between the metals and non-metals in periodic table.

Transition metals have varying oxidation state. Copper exists in +1, +2 and +3 oxidation states.

Any substance containing 6.022×10²³ atoms is called one mole of that substance. This number is called Avogadro number. Hence one mole of each element contains avogadro number of its atoms.

Similarly one mole of each compound contains 6.022×10²³ number of molecules. Here, the atomic mass of copper is 63.55 g. That is one mole of copper weighs 63.55 g. Hence, number of atoms in 63.55 g of copper is 6.022×10²³ atoms.

To find more about Avogadro number, refer the link below:

https://brainly.com/question/11907018

#SPJ2

Methane and sulfur react to produce carbon disulfide (CS₂), a liquid often used in the production of cellophane.

2CH₄ + S₈ --> 2CS₂ + 4H₂S

Calculate the moles of H₂S produced when 2.25 mol S₈ is used.

Answers

Answer:

9 moles

Explanation:

The balanced chemical equation provided in this question is as follows:

2CH₄ + S₈ → 2CS₂ + 4H₂S

In accordance to the above balanced equation, 1 mole of sulphur (S8) produces 4 moles of hydrogen sulfide (H2S).

Therefore, if 2.25mol of S8 is used, 2.25 × 4 = 9 mol

9 moles of H2S is produced.

What happens to the amplitude of waves when two waves overlap and are out of phase with each other?

Answers

Answer:

Also called superposition. When overlapping waves produce a wave with an amplitude that is the sum of the individual waves. When overlapping waves produce a wave with an amplitude that is less than the sum of the individual waves.

Explanation:

Which object will have more potential energy (PE), a book on the edge of a small bookshelf or a penny sitting on the edge of the Empire State building? EXPLAIN your reasoning.

Answers

Answer: I dont know

Explanation: figure it out

A percent composition analysis yields
22.6% phosphorus (P) and 77.4%
chlorine (CI). What is the empirical
formula for the compound?
А
B
P2C17
PCI:

Answers

Answer:

PCl₃

Explanation:

To determine the empirical formula of a compound, we need to follow a series of steps.

Step 1: Divide each percent composition by the atomic mass of the element

P: 22.6/30.97 = 0.729

Cl: 77.4/35.45 = 2.18

Step 2: Divide all the numbers by the smallest one, i.e. 0.729

P: 0.729/0.729 = 1

Cl: 2.18/0.729 ≈ 3

The empirical formula of the compound is PCl₃.

A diver takes a balloon with a volume of 2.5Lfrom the surface, where the pressure is 1.0 atm, to a depth of 20m, where the pressure is 3.0 atm. What happen to the volume of the balloon? What if the end of the subnerged balloon is on a long pipe that goes to the surface and is attached to another balloon?

Answers

Answer:

The explanation is given below:

Explanation:

As we know that the volume is inversely proportional to the volume. If the pressure is rising from 1 atm to 3 atm so the volume of the ballon would decrease

P_1V_1 = P_2V_2

1.0 × 2.5L = 3 × V_2

V_2 = 0.833L

Since the air is moving from high pressure to low pressure and the two ballons are interconnected via a long pipe so the movement of the air is from bottom to top

d. If you were to open the carbonated drink bottle after shaking, what would you expect to happen and why? If you were to open the water bottle after shaking, what would you expect to happen and why?

Answers

Shaking causes small bubbles, which helps the soda's carbon dioxide escape faster. The gas will gradually escape from the liquid as bubbles once the can is opened, and the soda will become "flat." The dissolved gas takes a long time to escape if the liquid is treated gently.

True or false solar power take power from wind and uses it to make electricity

Answers

The answer is false

How many grams of Pb are there in a sample of Pb that contains 1.15×1024 atoms? grams

Answers

Solution:

[tex]\text{mass of Pb = 1.15 × 10²⁴ Pb atoms} × \frac{\text{1 mol Pb}}{\text{6.022 × 10²³ Pb atoms}} × \frac{\text{207.2 g Pb}}{\text{1 mol Pb}}[/tex]

[tex]\boxed{\text{mass of Pb = 396 g}}[/tex]

how many atoms of carbon are in a diamond with a mass of 0.568 g?

Answers

Answer:

There are 2.85 x 10^22 atoms of carbon in a diamond with a mass of 0.568 g.

Hope this helps! :)

Aqueous copper (II) sulfate reacts with aqueous potassium fluoride to produce
a precipitate of copper (II) phosphate and aqueous potassium sulfate.

Answers

Answer:

CuSO₄(aq) + 2 KF(aq) = CuF₂ + K₂SO₄

Explanation:

The question is missing but I think it must be about writing and balancing the equation.

Let's consider the unbalanced equation for the reaction that occurs when aqueous copper (II) sulfate reacts with aqueous potassium fluoride to produce  a precipitate of copper (II) fluoride (I fixed a mistake here) and aqueous potassium sulfate. This is a double displacement reaction.

CuSO₄(aq) + KF(aq) = CuF₂ + K₂SO₄

Since only K and F atoms are not balanced, we will get the balanced equation by multiplying KF by 2.

CuSO₄(aq) + 2 KF(aq) = CuF₂ + K₂SO₄

An electromagnet is the most powerful type of magnet there is. It is a magnet with a current running through it that can be turned on and off. Why might it be useful to be able to turn the electromagnet on and off?(1 point) 1

to not waste electricity

to control the strength of the magnet

to reduce wearing out of the magnet over time

to latch onto and let go of objects


What does electric current measure?(1 point) 2

how quickly electrical energy moves in a circuit

how frequently electrical energy moves in a circuit

how much electrical energy moves in a circuit

how well electrical energy moves in a circuit



How is a magnetic field produced?(1 point) 3

when an object has an electric charge

when electrons move through a circuit

when a current runs through a conductor

when an electromagnetic field interacts with a magnet


Which statement best describes how an electromagnetic motor works?(1 point) 4

Electrons are moved through a magnet, creating a circuit. That circuit interacts with a current, moving the conductor in the orientation of the field.

Electrons are moved through a circuit, creating a current. That current interacts with a magnet, moving the conductor in the orientation of the field.

Electrons are moved through a current, creating a circuit. That circuit interacts with a magnet, moving the conductor in the orientation of the field.

Electrons are moved through a magnet, creating a current. That current interacts with a circuit, moving the conductor in the orientation of the field.


Electromagnetism in Use Quick Check
5 of 5Items
Item 5
Use the image to answer the question.

A diagram shows a wire carrying a current in vertical direction. The magnetic field drawn using compass needles around the wire are concentric circles in a plane perpendicular to the direction of current.

What are the particles demonstrating in this image?

(1 point) 5

electric field

electromagnetic field

electromagnetic motor

magnetic field

Answers

Answer:

1. to latch onto and let go of eggs

2. how quickly electrical energy moves in a circuit

3.  when a current runs through a conductor

4. Electrons are moved through a circuit, creating a current. That current interacts with a magnet, moving the conductor in the orientation of the field.

5.  electromagnetic field

Determine the enthalpy of neutralization in Joules/mmol for a solution resulting from 19 mL of 1 M NaOH solution and 19 mL of a HCl with the same molarity. If separately, each had a temperature of 28.6 degrees Celsius, and upon addition, the highest temperature reached by the solution was graphically determined to be 37.3 degrees Celsius. Round to the nearest whole number.

Answers

Answer:

[tex]\Delta _{neutralization}H=-73\frac{J}{mmol}[/tex]

Explanation:

Hello there!

In this case, by considering this calorimetry problem, it is possible to realize that the heat released by the reaction between HCl and NaOH is absorbed by the reaction mixture, which can be assumed to have the same density and specific heat of pure water; thus, we calculate this heat as a function of the specified temperature change:

[tex]Q_{rxn}=-Q_{solution}\\\\Q_{rxn}=-m_{solution}C_{solution}(T_2-T_1)[/tex]

Thus, we plug in the data, by also considering that the total volume of solution is 19mL+19mL=38mL:

[tex]Q_{rxn}=-(38mL*\frac{1g}{1mL} )(4.184\frac{J}{g\°C}) (37.3\°C-28.6\°C)\\\\Q_{rxn}=-1383.2J[/tex]

Next, since the reaction between NaOH and HCl is:

[tex]NaOH+HCl\rightarrow NaCl+H_2O[/tex]

Whereas there is 1:1 mole ratio of NaOH to HCl, we infer they both react with the same moles, defined by the volume and molarity:

[tex]n_{rxn}=0.019L*1mol/L\\\\n_{rxn}=0.019mol[/tex]

Finally, to compute the enthalpy of neutralization we divide the total heat due to the reaction by the reaction moles to obtain:

[tex]\Delta _{neutralization}H=\frac{Q_{rxn}}{n_{rxn}=}\\\\ \Delta _{neutralization}H=\frac{-1383.23J}{0.019mol}\\\\\Delta _{neutralization}H=-72801.6\frac{J}{mol}*\frac{1mol}{1000mmol}\\\\\Delta _{neutralization}H=-73\frac{J}{mmol}[/tex]

Best regards!

How do prevailing winds affect air temperature?

Answers

Answer:

Explanation:

Prevailing winds bring air from one type of climate to another. For example, warm winds that travel over water tend to collect moisture as they travel; the water vapor in the air will condense as it moves into colder climates, which is why temperate coastal areas often receive heavy rainfall

Mark as brainliest for further answers :)

C3H8(g) + 5O2(g) ⟶ 3CO2(g) + 4H2O(g) H = -2220 kJ If 865.9 g of H2O is produced during this combustion, how much heat is generated? Do not include the negative sign in your answer. Express the answer to the nearest whole number, or round to the nearest ones place. The molar mass of H2O is 18.02 g/mol.

Answers

Answer:

3 × 10⁴ kJ

Explanation:

Step 1: Write the balanced thermochemical equation

C₃H₈(g) + 5 O₂(g) ⟶ 3 CO₂(g) + 4 H₂O(g) ΔH = -2220 kJ

Step 2: Calculate the moles corresponding to 865.9 g of H₂O

The molar mass of H₂O is 18.02 g/mol.

865.9 g × 1 mol/18.02 g = 48.05 mol

Step 3: Calculate the heat produced when 48.05 moles of H₂O are produced

According to the thermochemical equation, 2220 kJ of heat are evolved when 4 moles of H₂O are produced.

48.05 mol × 2220 kJ/4 mol = 2.667 × 10⁴ kJ ≈ 3 × 10⁴ kJ

An allele is a form of a gene? true or false

Answers

Answer:

true

Explanation:

What is the precipitation like in the arctic tundra?

Use this website to answer the question: https://thewildclassroom.com/biomes/artictundra-2/

Question 4 options:

In summer, it typically rains less than 5 cm (<2 inches), while in winter it rains 25–44 cm (10–17 inches).


There is an average of 20 – 35 inches of rainfall a year.


The range is from 15-25cm (6-10 inches) a year where most falls as snow.


It can can also be called a cold desert due to its lack of precipitation.

Answers

Answer:

In summer, it typically rains less than 5 cm (<2 inches), while in winter it rains 25–44 cm (10–17 inches).

Explanation:

because tundra vegetation is mostly found in desert areas

What is the molecular geometry of COF2?

Answers

Answer:

trigonal planar

Explanation:

> Question 20 3.3 pts A gas occupies 500.0 mL at a temperature of 27.0°C. What is the volume at 15.0°C? (Remember to convert °C to Kelvin.) Use Charles' Law V1T2 = V2T1 © 1500 O 480 0 350 900​

Answers

Answer:

480.0 mL

Explanation:

Step 1: Given data

Initial volume (V₁): 500.0 mLInitial temperature (T₁): 27.0 °CFinal volume (V₂): ?Final temperature (T₂): 15.0 °C

Step 2: Convert the temperatures to the Kelvin scale

We will use the following expression.

K = °C + 273.15

K = 27.0°C + 273.15 = 300.2 K

K = 15.0°C + 273.15 = 288.2 K

Step 3: Calculate the final volume

Assuming ideal behavior and constant pressure, we can calculate the final volume using Charles' law.

V₁ × T₂ = V₂ × T₁

V₂ = V₁ × T₂ / T₁

V₂ = 500.0 mL × 288.2 K / 300.2 K = 480.0 mL

Why do atoms connect to eachother?

Answers

Answer:

To keep from falling apart

Explanation:

To keep from falling apart

Sally rides her bike to the store to get some Skittles. The store is 5 km
away. If it takes her 10 minutes to get to the store what is her average
speed?

0.5 km/hr
0.5 mph
0.5 km/min
5 km/min

Answers

Answer:

Sally's average speed is 0.5 km/min

Explanation:

speed=distance/time

so, 5km/10min=0.5 km/min

USA test prep wave 1 performance task

Answers

Answer:

Performance Tasks 188; Instructional Videos 75

Explanation:

How many moles of carbon dioxide are produced when 0.25 mole of butane is consumed?

Answers

Answer:

1

Explanation:

Let's write the equation first:

[tex]C_{4}H_{10} + \frac{13}{2} O_{2} -> 4 CO_2 +5 H_{2}O[/tex]

So 1 mole of butane reacts to give 4moles of Carbon diOxide.

thus , 0.25 mole of butane will react to give = 4 * 0.25= 1 mole Carbon diOxide

In the hydrogenation of ethylene using a nickel catalyst, the initial concentration of ethylene is 1.65 mol⋅L−1 and its rate constant (k) is 0.0014 mol⋅L−1⋅s−1 . Determine the rate of reaction if it follows a zero-order reaction mechanism.

Answers

Answer:

.0014 M/s ( (mol*L^-1 / s) )

Explanation:

Since the rate law of a zero order reaction is Rate = k[A]^0, the rate is .0014 * (1.65)^0 = .0014

An ideal gas in a sealed container has an initial volume of 2.80 L. At constant pressure, it is cooled to 18.00 °C, where its
final volume is 1.75 L. What was the initial temperature?

Answers

Answer:

[tex]T_1=-91.18\°C[/tex]

Explanation:

Hello there!

In this case, given the T-V variation, we understand it is possible to apply the Charles' law as shown below:

[tex]\frac{T_1}{V_1}= \frac{T_2}{V_2}[/tex]

Thus, since we are interested in the initial temperature, we can solve for T1, plug in the volumes and use T2 in kelvins:

[tex]T_1= \frac{T_2V_1}{V_2}\\\\T_1= \frac{(18.00+273.15)K(1.75L)}{(2.80L)}\\\\T_1=182K-273.15\\\\T_1=-91.18\°C[/tex]

Best regards!

What class of chemicals is responsible for ozone depletion?

Answers

Chlorofluorocarbons (CFCs) and other halogenated ozone-depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion.

How to find the net ionic of an equation

Answers

Net ionic equation can be written from complete ionic equation by canceling the spectators ion from complete ionic equation.
For example:
Balanced Chemical equation:
HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)
Ionic equation:
H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)
Net ionic equation:
H⁺(aq) + OH⁻(aq) → H₂O(l)
The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.
Spectator ions:
These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
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