Which of the following do scientists use to form a hypothesis?

A.
A question and observations

B.
A conclusion and data

C.
A conclusion and a theory

D.
A question and opinions

Answers

Answer 1

Explanation:

The scientific method involves making observations and asking questions. Scientists form hypotheses based on these observations and then develop controlled experiments to collecting and analyze data. Using this data, they are able to draw conclusions and form questions for new scientific research.

:)ᴍᴀʀᴋ ᴀꜱ ʙʀᴀɪɴʟɪꜱᴛ


Related Questions

Which obstacle was faced by African Americans serving in the armed forces during World War II?
They were forced to serve in segregated units.
They were not subject to military conscription.
ОООО
None of them ever saw combat during the war.
They were placed under French command.

Answers

They were not subject to military conscription

Given the reaction
3 H3PO4 + 2 Ba(OH)2 ⇒ BaPO4 + 6 H20
How many grams of precipitate could you make if you reacted 286.0 mL of 3.000 M H3PO4 with 855.0 mL of 1.400 M Ba(OH)2

Answers

Answer:

240.17 g Ba3(PO4)2

Explanation:

1. Determine the limiting reactant.

2H3PO4 + 3Ba(OH)2 --> Ba3(PO4)2 + 6H2O

moles H3PO4 = M x V = 3 x 0.286 = .858 moles H3PO4

moles Ba(OH)2 = M x V = 1.4 x 0.855 = 1.197 moles Ba(OH)2

ratio Ba(OH)2 : H3PO4 = 1.197: .858 = 1.39: 1

stoichiometric ratio Ba(OH)2 : H3PO4  = 3:2

Ba(OH)2is the limiting reactant

MM Ba3(PO4)2 = 601.92 g/mol

g Ba3(PO4)2 = moles Ba(OH)2 x(1 mol Ba3(PO4)2/3 moles Ba(OH)2) x (MM Ba3(PO4)2/ 1mol Ba3(PO4)2) = 1.197 x 1/3 x 601.92 = 240.17 g Ba3(PO4)2

What is the concentration of a 22.35 L solution that contains 9.95 moles of sodium
acetate? Round your answer to the correct number of significant figures.

Answers

Answer:

0.445 M

Explanation:

Molarity = moles/Volume

M = 9.95/22.35 = 0.445 M

Fossil fuels are made up of organisms that died millions of years ago. Which best describes this source of energy

Answers

nonrenewable
hope this helps

why do you think season will impact the size of a rabbit population​

Answers

They would get out of there burrows in around spring when they are mostly out and the start reproducing

What enzyme catalyses the reaction of PRPP transfer to hypoxanthine with
formation of IMP?

Answers

Answer:

HPRT

Explanation:

HPRT catalyzes the salvage reactions of hypoxanthine and guanine with PRPP to form IMP and GMP

The formation of GMP from IMP requires oxidation at C-2 of the purine ring, followed by a glutamine-dependent amidotransferase reaction that replaces the oxygen on C-2 with an amino group to yield 2-amino,6-oxy purine nucleoside monophosphate, or as this compound is commonly known, guanosine monophosphate.

The answer please thank you

Answers

Answer:

B

Explanation:

Calculate the pH of each of the following aqueous solutions. (Enter your answers to two decimal places.) (a) 10.0 mL deionized water WebAssign will check your answer for the correct number of significant figures. 2.72 Incorrect: Your answer is incorrect. (b) 10.0 mL deionized water plus 5.0 mL of 0.10 M NaOH WebAssign will check your answer for the correct number of significant figures. (c) 10.0 mL deionized water plus 10.0 mL of 0.10 M NaOH WebAssign will check your answer for the correct number of significant figures. (d) 10.0 mL deionized water plus 15.0 mL of 0.10 M NaOH WebAssign will check your answer for the correct number of significant figures.

Answers

Answer:

a. pH = 7.0

b. pH = 12.52

c. pH = 12.70

d. pH = 12.78

Explanation:

a. Deionized water has the [H⁺] of pure water = 1x10⁻⁷ (Kw = 1x10⁻¹⁴ = [H⁺][OH⁻] - [H⁺] = [OH⁻ -)

pH = -log[H⁺] = 7

b. Moles NaOH = 5x10⁻³L * (0.10mol / L) = 5x10⁻⁴moles OH⁻ / 0.015L = 0.0333M = [OH⁻]

-Total volume = 10mL+5mL = 15mL = 0.015L

pOH = -log[OH⁻] = 1.48

pH = 14-pOH

pH = 12.52

c. Moles NaOH = 0.010L * (0.10mol / L) = 1x10⁻³moles OH⁻ / 0.020L = 0.0500M = [OH⁻]

-Total volume = 10mL+10mL = 20mL = 0.020L

pOH = -log[OH⁻] = 1.30

pH = 14-pOH

pH = 12.70

d. Moles NaOH = 0.015L * (0.10mol / L) = 1.5x10⁻³moles OH⁻ / 0.025L = 0.060M = [OH⁻]

-Total volume = 10mL+15mL = 25mL = 0.025L

pOH = -log[OH⁻] = 1.22

pH = 14-pOH

pH = 12.78

The amount of freshwater on the earth is

Answers

3percent

is fresh

pls make me brainliest

plsssssss

#captainpower

97.5% being salt water and 2.5% being fresh water. Of the fresh water, only 0.3% is in liquid form on the surface.

How many moles are in 20.0g of lithium?

Answers

Answer:

I believe it is 5.00

Explanation:


Part A
Of the atoms below, ____
is the most electronegative.
- As
- Si
- P
- N
- C

Answers

Answer:

N

Explanation:

Electronegativity increases as you move from left to right across a period, and decreases as you move down the groups.

Answer:

N .. ........................

Oxygen gas was produced in a reaction and collected over water. A 136.1 mL mL sample of gas was collected over water at 25C and 1.06 atm. The vapor pressure of water is 23.76 mmHg at 25C. Find the mass of ocygen gas collected in a reaction and collected over water. A 136.1 mL sample of gas was collected over water at 25C and 1.06 atm. The vapor pressure of water is 23.76 mmHg at 25C. Find the mass of oxygen gas collected.

Answers

Answer:

Explanation:

We shall find volume of gas at NTP or at 273 K , 760 mm of Hg .

Pressure of given gas = 1.06 x 760 mm of Hg less vapor pressure of water .

= 805.6 - 23.76 = 781.84 mm of Hg

For it we use gas law formula ,

P₁V₁ / T₁ = P₂V₂ / T₂

781.84 x 136.1 / ( 273 + 25 ) = 760 x V₂ / 273

= 128.26 mL .

= 128.26  x 10⁻³ L .

22.4 L of oxygen will have mass of 32 g

128.26 x 10⁻³ L of oxygen will have mass of 32 x 128.26 x 10⁻³ / 22.4 g

= 183.22 mg .

Need QUICK ANSWERS!!!!!!!!!!!!!!!!!!

Answers

Answer: 125.0964 g

Explanation:

Density = mass/volume

Density = 2.7 gcm-3

Volume = 2.7*14.3 = 46.332

Mass=?

Mass= density*volume

= 2.7 x 46.332 = 125.0964 g

Hope this helps! :)

I have an unknown initial volume of gas
held at a temperature of 115 K in a
container with a pressure of 6 atm. I
increase the temperature to 225 K and
decrease the pressure to 2,800 mmHg
and it causes the final volume of the gas
to be 29 L. What was the initial
volume?

Answers

Answer:

V₁ = 0.025 Liters = 25 ml

Explanation:

P₁ = 6 Atm      P₂ = 7800mm/760mm/Atm = 0.01 Atm

V₁ = ?              V₂ = 29 Liters

T₁ = 115 K        T₂ = 225 K

P₁V₁/T₁ = P₂V₂/T₂ => V₁ = P₂V₂T₁/P₁T₂

V₁ = (0.01 Atm)(29L)(115K)/(6 Atm)(225K) = 0.025 Liters = 25ml

Zinc metal reacts with copper sulfate through the following
reaction:
Zn + CuSO4 → Cu + ZnSO4
The percent yield for a reaction in which 32.5 g of Zn is reacted
in excess CuSO4 solution is 85.0 %. What is the actual yield of
copper of this reaction?
g

Answers

Answer:26.9

Explanation:

Which of this is formed when a metal reacts with steam ? *

Carbon dioxide
A Salt
An oxide
A metal hydroxide


Answers

I believe its metal hydroxide
Answer:
A metal hydroxide
I think so

Which statement describes a chemical property of sodium

A Sodium changes from a solid to liquid at a temperature of 97.8°C

B Sodium has the ability to react with chlorine and from a new substance.

C Sodium has destiny if 0.97 g/cm3.

D Sodium takes the form of a solid at room temperature

Answers

Answer:

Option b is show the chemical property of sodium....

How does each structure of a sperm cell contribute to the sperm's function?

Answers

The midpiece of the sperm is packed with mitochondria. Mitochondria are organelles in the cell that produce energy. Sperm use the energy in the midpiece to move. The tail of the sperm moves like a propeller, around and around.

Balance equation mg3n2+h2so4=mgso4+(nh4)2​

Answers

Answer:

Mg₃N₂  +  4 H₂SO₄  ⇒  3 MgSO₄  +   (NH₄)₂SO₄

Explanation:

To balance an equation, you need to make both sides of the equation have equal number of each element.  Also, I think that you didn't write the whole equation since the reaction you gave is not likely.

Mg₃N₂  +  4 H₂SO₄  ⇒  3 MgSO₄  +   (NH₄)₂SO₄

Find a part of the article that describes signals that are sent within Diego’s body. Where does the signal come from, and how does it cause Diego to feel or react?

Answers

Answer:

The sensory receptors send signals to Diego's brain cells. These signals are messages that help Diego figure out what to do next. As Diego thinks, more signals move from one brain cell to another.

The sensory receptors send signals to Diego's brain cells. These signals are messages that help Diego figure out what to do next. As Diego thinks, more signals move from one brain cell to another.

What are sensory receptor?

The capacity to react to stimuli is one of the traits of a living thing. The highly developed sensory system of humans can concurrently analyze thousands of incoming messages.

Dendrites of sensory neurons are specialized for receiving particular types of stimuli and are known as sensory receptors. There are three ways to classify sensory receptors.

Exteroceptors are located at or close to the skin's surface and are responsive to stimuli coming from the outside or the body's surface. These receptors include those for vision, hearing, smell, and taste as well as those for touch, pain, and temperature.

Therefore, The sensory receptors send signals to Diego's brain cells. These signals are messages that help Diego figure out what to do next. As Diego thinks, more signals move from one brain cell to another.

To learn more about sensory receptors, refer to the link:

https://brainly.com/question/3190796

#SPJ2

What is the number of moles in 125ml of 0.25 M NaNO3solution?

Answers

Answer:

0.0313 mole.

Explanation:

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

Volume of solution = 125 mL

Molarity of NaNO₃ = 0.25 M

Number of mole of NaNO₃ =?

Next, we shall convert 125 mL to litre (L). This can be obtained as follow:

1000 mL = 1 L

Therefore,

125 mL = 125 mL × 1 L / 1000 mL

125 mL = 0.125 L

Thus, 125 mL is equivalent to 0.125 L.

Finally, we shall determine the number of mole of NaNO₃ in the solution. This can be obtained as follow:

Volume of solution = 0.125 L.

Molarity of NaNO₃ = 0.25 M

Number of mole of NaNO₃ =?

Molarity = mole / Volume

0.25 = mole of NaNO₃ / 0.125

Cross multiply

Mole of NaNO₃ = 0.25 × 0.125

Mole of NaNO₃ = 0.0313 mole.

How many grams of a 26.9% sugar solution contain 49.0 g of sugar?

Answers

Answer:

182.156g

Explanation:

grams = 49/.269 = 182.156g needed

Use the solubility rules from the Lab 4 introduction and your knowledge of qualitative separation schemes from the lab to answer the following questions. The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag , K , NH4 , Hg22 , Pb2 , Mg2 , Sr2 , Ba2 , Cu2 , Al3 and Fe3 .
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl?
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(b) After the addition of HCl, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2SO4? (Hint: H2SO4 is a source of sulfate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+

Answers

Answer:

a13+a13

Explanation:

Analysis: Consider Joe's story. IF the test shows he does have Marfan syndrome, and if he inherited the Marfan gene from his mother, does this mean that his brother and sister also have it? You may want to draw up a Punnett Square or drawing to help you explain your answer. HINT: Is there any suggestion that he got a Marfan gene from his father?

Answers

We inherit genes from our biological parents in specific ways. One way is called autosomal dominant inheritance.

What is autosomal dominant inheritance?

Autosomal dominant inheritance means that the gene in question is located on one of the autosomes. These are numbered pairs of chromosomes, 1 through 22. (These chromosomes do not determine an offspring's gender.) Dominant means that only one gene from one parent is necessary to pass down a trait or a disorder. When a parent has a dominant trait or disorder, there is a 50 percent chance that any child he or she has will also inherit the trait or disorder:

Genetic illustration demonstrating autosomal dominant inheritance

Click Image to Enlarge

What is Marfan syndrome?

Marfan syndrome occurs in one of 5,000 live births. It is a connective tissue disorder associated with autosomal dominant inheritance. Connective tissue is abundant in the body and is important as a supporting structure. It is especially important for the musculoskeletal system. It also provides support for other body systems as well, including the eyes and the heart. The gene for Marfan syndrome is called fibrillin-1. This gene is localized to chromosome #15 on the long arm (q) at 15q21.1.  

Common findings in individuals with Marfan syndrome include those related to connective tissue disorders. These include abnormal enlargement of the aortic root of the heart, dislocated lenses of the eyes, and a tall, lanky body with increased joint mobility, scoliosis, long flat feet, and long fingers. Findings may vary among individuals diagnosed with this condition, even within a family.

If an individual carries an abnormal gene for Marfan syndrome, that individual has a 50 percent risk of passing down the disorder to each future offspring. If a person does not carry the gene abnormality, then the risk for occurrence of the disorder in future offspring is the same as for the general population.

Explanation:

I need help with this chem problem!

Answers

sorry i’m taking chem next year so i can’t answer it but don’t press the link that the other person gave u. i think it tracks ur location

hi, if your looking for extra points (50+) and brainiest here is ur chance, answer this question correctly plz

Answers

Its the warm air what helps them also of energy of the sun

it is B. storms with more energy cause more destruction

Convert 5.7 kcal to its value in calories.

Answers

Answer:

5700

Explanation:

identify the conjugate acid-base H20 (i) + CH3NH2(aq) —> OH-(ag)+ CH3NH3-(ag)​

Answers

A. taste. B. turns. C. react. D. neutr. E. react. Which is t. A. OH. -. B. H2O ... acids are e conjugate. BANK] w.kau.edu.sa. ______ acid-base p a/aasiri2 1 ... Identify th. HCO. A. H2O. B. HCO. C. H2CO. D. PO4. 3. E. none. Identify th ... (aq) + HCN(aq) → H2O(aq) + CN. -. (aq). D. HCN(aq) + CH3NH2(aq) → CH3NH3. +. (aq)+ CN.

Calculate the moles of electrons obtained from 250coulomb of electricity

Answers

Answer:

[tex]n=0.00259 mol[/tex]

Explanation:

Hello there!

In this case, since the Faraday's constant is 96500 Coulombs per mole, we can set up the following process to obtain the moles in 250 Coulombs:

[tex]n=\frac{250C}{96500C/mol}\\\\n=0.00259 mol[/tex]

Best regards!

Some elements got their names from ancient languages
such as Greek or Latin
TRUE or FALSE
If so list some examples of elements

Answers

True. Examples: Calcium Helium Mercury

Answer:

True

Explanation:

this was on one of my quizziz

Other Questions
Five types of loss that can cause grief 6th grade social studiesWhich of the following best describes a representative democracy?a. Citizens elect officials to make the lawsb. All citizens help make the lawsc. All men, women and children voted. Citizens act as judges and lawmakers Which expression is equivalent to x + x + 4y?A)4xyB)6xyC)6 + xyD)2x + 4y Which of the numbers below is greater than -2.4? Select all that apply.A) 1.3B) 3.6C) 2D) 32E) 5 in a class, the ratio of boys to girls is four to three. if there are 20 boys in the class, how many girls are there? process plss Mrs. Sanchez went to the hair salon.The cost of her haircut and style was$44.35, before tax. The sales tax ratewas 8%. If she added a 20% tip to thetotal amount before tax, how muchMdid she pay for the service at thesalon? (Sales tax is paid only on theservice, not the tip.) In a process called transpiration, plants get rid of excess water through pores in the leaves called stomata. This excess water is then released into the atmosphere as part of the water cycle. Which of the following terms best describes how the released water enters the atmosphere?Group of answer choicesprecipitationcondensationcapillary actionevaporation Find the perimeter of the polygon.a. 25 cmb. 20 cmC. 30 cmd. 28 cm City y is 10 miles north of city x city z is 24 miles east of city x how long is the straight roads connecting cities y and z? https://www.news4jax.com/positively-jax/2021/02/19/kindness-kabinet-in-atlantic-beach-leave-what-you-can-take-what-you-need/Summary of the article ^ minimum 1 paragrpah please 12 6x9y>12 what inequalities is equivalent to the inequality Scenario 2: Saving for college You are a freshman in high school and have your eye on a college degree. But college is expensive, especially since the costs include tuition, food, living expenses, travel, and books. What financial information do you need? What financial decision-making strategies can you use? (Cost comparison, cost-benefit analysis, calculating future expenses, or budgeting?) ". . . The replacement of the bourgeois by the proletarian state is impossible without a violent revolution. The abolition of the proletarian state, i.e., of all states, is only possible through 'withering away.' . . ."This quotation was most likely written during which historical period?(1) 1900-1930(2) 1945-1990(3) 1800-1870 (4) 1789-1799 I need help with 2.04, 2.06 and 2.08!! When would you use a pictograph? to compare change over time if the data is numerical to save space for a large set of data if the data is categorical In GHI, the measure of I=90, GH = 8.5 feet, and IG = 4.7 feet. Find the measure of G to the nearest tenth of a degree how is the white mans burden used in society today Diane sells candles online and ships them to her customers. Each candle weighs 1.5 pounds. When a customer orders more than one candle, Diane ships all of the customer's candles in one box. She weighs the box to determine shipping cost. This table shows the weight per shipment. Choose ALL amounts that could be added to this table. A) 4.5 B) 5 C) 6 D) 6.5 E) 7 Someone plsss help me on this!!!! A family of bears is going to a movie. The following data points represent the ticket and candy price (in dollars) for each bear.