What phrase describes a good scientific question?
has a wide focus
addresses a gap in knowledge
does not lead to a testable hypothesis
O has a simple yes or no answer
vious Activity

Answers

Answer 1
address a gap in knowledge

Related Questions

which best describes nuclear energy?
A the energy that matter has due to the vibrations of its particles
B the energy an object has due to its chemical bonds
C the energy generated by a flow of electrons
D the energy stored inside the center of an atom

Answers

Answer:

The correct answer is - D.  the energy stored inside the center of an atom.

Explanation:

Each atom has a small center in it called the nucleus and the energy that holds the nucleus or center of the atom together in the atom is known as nuclear energy.

It is the energy that is stored in the center of the atom and normally does not come out, however, in some radioactive atoms the sends some part of the energy as radiation.

Thus, the correct answer is - D.  the energy stored inside the center of an atom.

Convert 15,000 seconds into minutes

Answers

Answer:

250 minutes

Explanation:

60 seconds = 1 minute

15000 secods = 15000 / 60

1500 secons = 250 minutes

define SI unit system​

Answers

Answer:

The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived.

H3C6H507 + H2O + H3O+ + H2C6H507
acid
base

Answers

Explanation:

an acid will give away a proton and become a conjugate base.

A base will accept a proton and become a conjugate acid.

Câu 6: Cho 4,2 gam este đơn chức no E tác dụng hết với dung dịch KOH ta thu được 4,76

gam muối natri. Vậy công thức cấu tạo của E có thể là:

Answers

Please translate this in English or Korean and I’ll be happily help :)

Sorry I just don’t understand this language nor know It or I would translate myself

what occurs when the vapor pressure of a lquid is equal to the external atmospheric pressure

Answers

Answer:

The change from a liquid phase to a gaseous phase occurs when the vapor pressure of the liquid is equal to the atmospheric pressure exerted on the liquid.

Explanation:

Boiling is a physical change and molecules are not chemically altered during the process.

A student in a lab holds an iron nail over an open flame, and no reaction occurs. The nail is then filed, creating small pieces of
iron shavings. These pieces burn brightly when placed over an open flame.
Which statement accurately identifies one of the changes that occurs as a physical or chemical change?

Answers

Formation of small pieces of iron shavings is a physical change whereas burning of pieces of iron shavings is chemical change.

Formation of small pieces of iron shavings is an example of physical change because it can be changed again into nail while on the other hand, burning of pieces of iron shavings on the flame is an example of chemical change because it can't change again into its original shape. Physical change is a change in matter which does not change the chemical properties of the matter whereas chemical change is a change in matter which change the chemical properties of the matter.

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Aluminum hydroxide containing medicine is used for gastric why


Answers

Answer:

Aluminum Hydroxide, Magnesium Hydroxide are antacids used together to relieve heartburn, acid indigestion, and upset stomach. They may be used to treat these symptoms in patients with peptic ulcer, gastritis, esophagitis, hiatal hernia, or too much acid in the stomach (gastric hyperacidity).

Answer:

wow it's a very nice question

Can you tell me name of Chemicals in food?​

Answers

Answer:

Guar gum

sodium nitrite

artificial food colorings

monosodium glutamate

etc

PLS HELP WILL GIVE BRAINLIEST
it is a simple chemistry question
i thought F has 9 electrons, so why does this structure show 8 electrons.

Answers

Answer:

The IUPAC structure only shows bond pairs and lone pairs. In the flouromethane structure above, there is only one bond pair and three lone pairs of electrons. Therefore there is one electron remaining, but since it doesn't not make up a pair, it is ignored in the structure but theoretically it is present.

[tex].[/tex]

Answer:

therefore there is one electron remaining , but since it doesn't make up a pair . It is ignored in the structure but theoretically it is present .

what is the purest form of iron​

Answers

Wrought iron is the purest form of iron. It contains 0.12 to 0.25% carbon and is thus the purest form of iron.
Wrought iron is the purest form of iron as it contains 0.12- 0.25% of carbon

what do you mean by acceleration due to gravity of a body is 10 metre per second square​

Answers

Answer:

If a body is accelerated by 10m/s^2, it means that the body's speed (or velocity to be precise) is increasing by 10m/s every second. That is, if the initial ...

Organisms do not adapt as a result of competition for resources.

Answers

Answer:

The given statement is False.

The organisms adapt as a result of competition for resources. Different places have different organisms suited for that particular places.

The animals living at a particular place compete for the resources available and the nature selects the organism that has won the competition for resources.

The organisms are evolved as a result of competition for resources

Answer:

I just wanted to say the other person is totally right.

this statement is false.

what is the requirements to obtain citizenship?

please answer it correctly​

Answers

Answer:

Age. ...

Residency. ...

Residence and Physical Presence.

Good Moral Character.

Attachment to the Constitution.

Language.

U.S. Government and History Knowledge.

Oath of Allegiance.

These are some requirements for obtaining citizenship .

Age
Culture
Race
Background

precautive measures taken when using pooter​

Answers

I guess ensuring that you don't suck the insects or specimen collected by ensuring there is a net in the pooter

A sample of oxygen gas occupies a volume of 160 liters at 364 K. What will be the volume of the gas when the temperature drops to 273 K?

210 L

120 L

62 L

470 L

Answers

Answer:

62L

.

.

.

.

tysm.

.

.

.

.

hope it help

Plz help me with this question
Drawing of water molecular formulas
1.Draw molecular structure of water​

Answers

Answer:

Here is your answer. I hope it will help you .

Im sorry if its difficult to read


we dont talk about how I messed up my first question and jad to make another one because im slow​

Answers

Answer:

A ball is thrown straight up from a rooftop 320 feet high. The formula below describes the ball's height above the ground, h, in feet, t seconds after it was thrown. The ball misses the rooftop on its way down and eventually strikes the ground. How long will it take for the ball to hit the ground? Use this information to provide tick marks with appropriate numbers along the horizontal axis in the figure shown.

h=-16t^2+16t+320

describe an activity to separate the mixture of sand and water​

Answers

Answer:

Sedimentation and decantation

Explanation:

Sedimentation and decantation: Mixture is kept undisturbed for some time. After some time, sand being heavier and insoluble in water, settles down at the bottom of container. Now, water is poured into another container to separate it from sand.

Answer:

evaporation or destillation

Explanation:

When sand is added to water it either hangs in the water or forms a layer at the bottom of the container. Sand therefore does not dissolve in water and is insoluble. It is easy to separate sand and water by filtering the mixture. Salt can be separated from a solution through evaporation.

Energy in the amount of 420 J is added to a 35 g sample of water at a temperature of 10°C. What is the final temperature of the water?

Answers

The final temperature of the water, T2 = 38.57°C

Temperature can be defined as a measure of the degree of hotness or coldness of a physical object (body). Thus, it is measured with a thermometer and its units are degree Celsius (°C), Fahrenheit (°F) and Kelvin (°K).

A calorie refers to the amount of heat required to raise the temperature of a gram of water by one (1) degree Celsius (1°C).

Given the following data:

Quantity of energy = 420JMass = 35 gramsInitial temperature, T1 = 10°C

The specific heat capacity of water is 4.2 J/g°C.

To find the final temperature of the water (T2):

Mathematically, the quantity of energy (heat capacity) is given by the formula;

[tex]Q = mcdt[/tex]

Where;

Q represents the heat capacity or quantity of heat.M represents the mass of an object.C represents the specific heat capacity of water.dt represents the change in temperature.

Substituting the values into the formula, we have;

[tex]420 = 3.5 \; * \; 4.2 \; * \; dt[/tex]

[tex]420 = 14.7 \; * \; dt\\\\dt = \frac{420}{14.7}[/tex]

Change in temperature, dt = 28.57°C

Next, we would solve for the final temperature by using this formula;

[tex]dt = T2 - T1[/tex]

[tex]28.57 = T_{2} - 10\\\\T_{2} = 28.57 \; + \; 10\\\\T_{2} = 38.57[/tex]

Final temperature, T2 = 38.57°C

Therefore, the final temperature of the water, T2 is equal to 38.57°C

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Arrange the steps in order to describe how photons and carbon dioxide (CO2) contribute to the warming of Earth.

CO2 in the atmosphere absorbs infrared
photons.

CO2 in the atmosphere emits infrared photons back toward Earth.

Photons from the Sun strike Earth and become infrared photons.

Earth radiates infrared photons into the atmosphere

The Sun radiates sunlight (visible)
photons

Answers

The Sun radiates sunlight (visible)  photons

Photons from the Sun strike Earth and become infrared photons.

Earth radiates infrared photons into the atmosphere

CO2 in the atmosphere absorbs infrared  photons.

CO2 in the atmosphere emits infrared photons back toward Earth.

Certain gases are known to contribute towards global warming. Such gases are called greenhouse gases. The infrared rays from the sun are absorbed by these gases as they are re-emitted from the earth and re-emitted.

The sun radiates photons to the earth which is re-radiated into outerspace from the earth's surface. CO2 and other greenhouse gases absorbs these gases and re-emit them to the earth thereby causing a gradually rise in the temperature of the earth called global warming.

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If an atom has three shell and number of valence electrons are two. Is this element metal
or non-metal and why? Name the element and it’s valency.

Answers

Answer:

Metal

Element: Calcium

Valency: 2

Explanation:

To find the element, let's use the periodic table. (Look below)

We already went past 3 shells, just need the 2 electrons after it.

Just skip to the 4th row and count 2 to the right

We end up at Calcium.

Calcium is a metal and we're also on the alkaline earth metals column.

Calcium will need to lose 2 electrons to reach stability, so the valency is 2.

Which phrase correctly describes the molecular structure within a molecule?(1 point)

A the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds

B long, repeating chains of molecules

C the smallest fundamental unit of a compound that participates in reactions, represented by a bonded group of atoms

D the basic unit of a chemical element

Answers

Answer: A the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds

Explanation: I just took the assessment and in my notebook molecular structure has a definition that is literally answer A. Also I got it right lol.

What is known about a reaction with a negative enthalpy?
A. The reaction is endothermic,
B. The reaction is spontaneous,
C. The reaction is exothermic,
D. The reverse reaction is favored,

Answers

Considering the definition of enthalpy of reaction, the correct answer is option C. a reaction with a negative enthalpy indicates that the reaction is exothermic.

Definition of enthalpy of reaction

The enthalpy of a chemical reaction as the heat absorbed or released when chemicals are transformed into a chemical reaction and it occurs at constant pressure.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

Finally, it must be taken into account that:

A reaction is called exothermic if its enthalpy of reaction is negative (that is, if the system gives up heat).A reaction is called endothermic if its enthalpy of reaction is positive (that is, if the system absorbs heat).

Summary

In summary, a reaction with a negative enthalpy indicates that the reaction is exothermic.

Learn more about enthalpy of reaction:

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Silica (also known as silicon dioxide) reacts with hydrofluoric acid to produce silicon tetrafluoride and water vapor.
a) Write the balanced chemical equation for the reaction

b) 12.5 g of silicon dioxide is reacted with a 24.6 g of hydrofluoric acid. What is the theoretical yield of water vapor?

c) If the actual yield of water vapor is 2.50 g, what is the percentage yield of the reaction?

Answers

The problem is solved by balancing the reaction equation as shown below. The stoichiometry of the reaction is now applied in solving the question.

The balanced reaction equation is:

SiO2 + 6HF → H2[SiF6] + 2H2O

Using stoichiometry

The amount of silicon dioxide reacted = 12.5 g/60.08 g/mol = 0.21 mole

1 mole SiO2 yields 2 moles of H2O

0.21 mole of SiO2 yields 0.21 * 2/1 = 0.42 moles of H2O

The amount of HF reacted = 24.6 g/20.01 g/mol = 1.23 moles of HF

6 moles of HF yield 2 mole of H2O

1.23 moles of HF yields 2 * 1.23/6 = 0.41 moles of H2O

Hence HF is the limiting reactant.

Theoretical yield of H2O = 0.41 moles of H2O * 18 g/mol = 7.38 g

The percentage yield of the water is = actual yield/theoretical yield * 100

Hence;

% yield = 2.50 g/7.38 g * 100 = 33.9%

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Câu 1: Trong các dung dịch sau, dung dịch nào làm quỳ tím đổi màu xanh?
A. HCl B. H2SO4 C. NaOH D. NaCl
Câu 2: Bazơ nào dưới đây là bazơ không tan?
A. KOH B. NaOH C. Cu(OH)2 D. Ca(OH)2
Câu 3: Trong các chất sau đây, chất nào không phải là muối?
A. HCl B. KCl

Answers

C. NaOH

C. Cu (OH)

A. HCl

help pls I will mark brainlest​

Answers

Resources found in lithosphere: gold and iron etc

Resources found in atmosphere: Water vapor, gases etc.

A phase change from a solid to a gas is called:

Answers

Answer:

sublimation

Explanation:

9. a) Name salt that can be prepared by precipitation

Answers

I think its the substances that sublimes

Which statement best describes redox behavior in an electrochemical cell?
Electrons are produced at the copper rod.
Electrons flow from cathode to anode.
Reduction occurs at the zinc electrolyte.
Charges are balanced during redox.

Answers

Answer:

The last one

Explanation:

Charges are balanced in a redox reaction

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Can someone work out this problem for me because I do not get it and it is due tomorrow for homework? 83.971 + 10.9 PLSS HELPPPP MEE!!!! Troy, a cash basis taxpayer, is employed by Eagle Corporation, also a cash basis taxpayer. Troy is a full-time employee of the corporation and receives a salary of $60,000 per year. He also receives a bonus equal to iO% of all collections from clients he serviced during the year. Determine the tax consequences of the following events to the corporation and to Troy A.On December 31, 2018, Troy was visiting a customer. The customer gave Troy a $10,000 check payable to the corporation for appraisal services Troy performed during 2018. Troy did not deliver the check to the corporation until January B. Gross Incom ne facts are the same as in part (a), except that the corporation is an accrual basis taxpayer and Troy deposited the check on December 31, but the hank did not add the deposit to the corporation's account until January 2019 C. The facts are the same as in part (a), except that the customer told Troy to hold the check until January 2019 when the customer could make a bank deposit that would cover the check choose isomer of hexanoic acid? A) - penthylformiateB) _ izopropyleacetate C) _ methylpropanoate D) _ a- Methylbutanoic acid In African art realstic representation ? Read these sentences. "I heard that the company Gail used to work for was accused of tax fraud. I wouldn't trust her to be on the parent teacher organization committee." Which logical fallacy is used here? moral equivalence bandwagon appeal circular reasoning red herring Ice Co stock has a beta of 1.85, the current risk-free rate is 5.10 percent, and the expected return on the market is 15.10 percent. What is Ice Co's cost of equity simplify. 5+ 8y^2- 12y^2+ 3y calculate the molecular formula of H2O Determine the center and radius of the following circle equation: Differentiate between virus and viroids. The lengths of the sides of a triangle are 4,5 and 6 if the length of the longest side of a similar triangle is 15,what is the length of the shortest side of the triangle Which expression corresponds to this graph? 1. thc hin php nhna) (2x-1)(x-8)b) (x^2-3)(2x+4)c) (2x-1)x+x^2-2(x-3)d) x(2x-6).(-3x)+9x(x-1)e) 2x(x^2-3x)-(x+1)(x^2-2)f)3x(x-1)+x^2(x-2)+3(x-1)(x+1) PLS HELP ME ON THIS QUESTION I WILL MARK YOU AS BRAINLIEST IF YOU KNKW THE ANSWER!! which of the following represents Find the missing segment in the image below what is the equation of the line written in general form? What is an equation of the line that passes through the points (0, 8) and (-8, -4)? Luis rushes 40m toward his truck. He notices he forgot his shoes and returns back to his house. His total travel time is 60s.What is Luiss average speed over the 60s?What is Luis average velocity over the 60s? Which of the following statements is true?(A) Active voice avoids responsibility and should never be used(B) Passive voice avoid responsibility and should never be used(C) Active voice takes responsibility and should be used the most(D) Passive voice takes responsibility and should be used the mostAnswer is C