How does a scientist make two solutions with the same molarity?
O A. By dissolving the same number of moles of each substance in the
same volume of water
B. By dissolving the same number of grams of each substance in the
same volume of water
C. By dissolving the maximum amount of each substance in the
same volume of water
D. By dissolving 1 mole of each substance in enough water to make
sure dissolving is complete

Answers

Answer 1

Answer:

a

Explanation:

It's a duh


Related Questions

what is a metal ore?​

Answers

Answer:

metal ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile extracting them

Give me formula for
1)Aluminium chloride
2) Copper sulphate
3) Zinc Nitrate
3) Ammonium Carbonate​

Answers

Answer:

1. AlCl₃

2. CuSO4

3. Zn(NO₃)₂

4. (NH4)2CO3

AlCl₃

CuSO₄

Zn(NO₃)₂

(NH₄)₂CO₃


Will these magnets attract or repel?
Attract
Repel

Answers

Answer:

repel, if you stick them together as they are, because the north and south poles are next to each other

Explanation:

They will repel because north are south is close

What does every weak base have? ​

Answers

Explanation:

has a Acids Bases

HCl LiOH

HBr NaOH

HI KOH

HNO 3

A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?
It increases

It decreases

It stays the same

Answers

Answers to the whole assignment:

**Check for proof photos at the bottom.**

**Answers are in bold.**

__________________________________________________________

A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?

A. It increases

For the same balloon, how does the density inside the balloon change?

A. increases

A scientist takes a small, partially inflated balloon out of liquid nitrogen (at a very low temperature). As the balloon rests on the table, it begins to grow in size. Which statement(s) best explains why the balloon grows?

B. The air warms and increases particle movement. Increased particle movement leads to increased volume.

C. Increased temperature means increased volume as long as the container is flexible.

__________________________________________________________

Answer the following questions with or without using a calculator.  

A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?  

✔ 11.2 L

A syringe contains 0.10 mol neon gas at STP. What volume does the syringe indicate?  

✔ 2.24 L

A chemist adds 0.10 mol argon gas to the syringe. The pressure and temperature remain constant. What will be the volume on the syringe after the argon is added?  

✔ 4.48 L

__________________________________________________________

Acetylene gas (C2H2) reacts with oxygen gas (O2) to produce carbon dioxide (CO2) and water vapor (H2O). How many liters of C2H2 are required to produce 75.0 L of CO2?

37.5  L

What volume of H2O is produced?

37.5  L

What volume of O2 is required?

93.8  L

When making the calculations, did you need to find the number of moles?  

✔ no

Liquid carbon disulfide (CS2) reacts with 44.8 L O2 gas to produce the gases carbon dioxide (CO2) and sulfur dioxide (SO2).  

What is the mass of carbon dioxide produced?

29.3  g

What is the mass of sulfur dioxide produced?

85.4  g

When making the calculations, did you need to find the number of moles?  

✔ yes

__________________________________________________________

Explanation:

The child is putting pressure on the balloon, and squishing particles together when he/she sits on it, thus increasing pressure. Since particles are being squished closer together, density also increases.

Inflated objects will grow in size when the air inside is hotter. This is because particles move more rapidly. An example would be bike tires being more inflated under hot conditions.

One mole of any gas at standard temperature and pressure (STP) will occupy 22.4 L. If pressure increases, the volume decreases, and vice versa. If moles decreases, so will the volume, and vice versa.

Here are photos of Edge just incase.

The pressure inside of the balloon will Increase. Hence The correct option is (A).

What is Boyle's Law ?

According to this law, the pressure (p) of a given quantity of gas varies inversely with its volume (v) at constant temperature; i.e., in equation form,

pv = k

Where K = constant.

Initial pressure = P₁Initial volume = V₁Final pressure =P₂Final volume = V₂

If we consider that temperature of the gas which filled inside the balloon is constant.

We know that , at constant temperature

P₁V₁ = P₂V₂

Given that

V₂ = V₁ / 2

P₂ = P₁V₁/V₂

P₂ = P₁V₁/V₁/2

P₂ = 2P₁

Therefore, the pressure inside the balloon will become double.Hence The correct option is (A).

Learn more about Gas Law here ;

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The atoms of elements A (blue) and B (orange) form 2 compounds shown here. Do these compounds obey the law of multiple proportions?

Answers

Hello. You have not presented the image that presents the two elements mentioned in the question. This makes it impossible for your question to be answered. However, I will try to help you as best I can.

To say whether the compounds obey the law of multiple proportions, you should observe whether one of the elements, formed from the compounds, maintains a fixed mass, while the other element presents the mass in a varied amount of small, whole numbers, spread across the formed compounds .

This is because the law of multiple proportions states that an element must have a fixed mass when reacting with another element to create compounds. This reaction will allow this element to keep the mass fixed, while the other element will generate different compounds, where each one presents a part of the mass of the forming element, in small and whole numbers.

A certain atom has a mass of 16 and an atomic number of 7. What element is this ?

Answers

Answer:

Nitrogen

Explanation:

According to the Periodic Table, the atom with a mass is 16 but the Atomic number is 7 for Nitrogen. That means that Nitrogen is an isotope.

What is the physical state of nitrogen at -200c

Answers

Nitrogen, for example, is a gas that liquefies at about −200° C and freezes around −210° C, whereas bismuth is a solid melting at 271° C and boiling at about 1,560° C.

There are many factors that influence the population changes of an ecosystem. Which of these does not influence population size in an ecosystem? A. Birthrates of animals B. An animal's weight C.Number of animals in habitats D.Number of animals in habitats

Answers

Answer:

B. An animal's weight

Explanation:

An animal's weight is the factor that does not influence population size in an ecosystem because this factor does not cause an increase or decrease the population of animals in an ecosystem. The birth and death rate of animals and number of animals in habitats are the factors that tells us about the increase and decrease in the population of organisms in an ecosystem but weight of organism can't affect the population.

Answer:

B. An animal's weight

Explanation:

Population growth is based on four fundamental factors: birth rate, death rate, immigration, and emigration.

why is baking powder a substance

Answers

Answer:

Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid. Because carbon dioxide is released at a faster rate through the acid-base reaction than through fermentation.

Baking powder is a mixture because it contains both sodium hydrogen phosphate and potassium hydrogen tartrate (two different compounds.)

What is the pH of a solution whose H + concentration is 4.0 10 –9?

Answers

Answer:

he pH of a solution is defined as the negative log10 [H+] ... 1 x 10-11. 11. Acidic Solution. 1 x 10-4. 4. 1 x 10-10. 10. 1 x 10-5. 5. 1 x 10-9.

Explanation:

m

The table below gives some characteristics of element Y.

Characteristics of element Y Values
Mass number 11
Number of neutrons in a single atom 6
Average atomic mass (grams/mole) 10.81

What is the identity of element Y?

Answers

Answer:

Boron B

Explanation:

According to the periodic table, Boron is the element with atomic mass of approximately 11 [i.e 10.81]

To calculate Neutrons

Neutrons = Mass number - Protons

Number of protons in Boron is same as atomic number which is 5

Thus, N = 11 - 5 = 6

I have an atomic number of 56 who am i?

Answers

Answer:

You are Barium

Explanation:

Have a great summer :)

Answer:

Barium

hope this helps

have a good day :)

Explanation:

What makes up a compound

Answers

Answer:

Elements make up a compound.

Two sentences conjoined by a conjunction word

If 9.9L of helium are in a tire at 303k,how many liters will be present at 403k if the pressure is held constant.

Answers

Answer:

Final volume, V2 = 13.18 Liters

Explanation:

Given the following data;

Initial volume = 9.9 L

Initial temperature = 303 K

Final temperature = 403 K

To find the final volume, we would use Charles law;

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles' law is given by the formula;

[tex] VT = K[/tex]

[tex] \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]

Where;

V1 and V2 represents the initial and final volumes respectively.T1 and T2 represents the initial and final temperatures respectively.

[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]

Making V2 as the subject formula, we have;

[tex] V_{2}= \frac{V1}{T1} * T_{2}[/tex]

[tex] V_{2}= \frac{9.9}{303} * 403 [/tex]

[tex] V_{2}= 0.0327 * 403 [/tex]

Final volume, V2 = 13.18 Liters

1. What is the volume of 4.00g of aluminum at STP?

Answers

Answer:

22.4cm³

Explanation:

Avogadro's law shows that Avogadro's volume is 22.4

Write the nuclear equation for the beta decay
of calcium-45.

Answers

Answer:

on https://www.ck12.org/book/peoples-physics-concepts/section/20.1/

Explanation:

it shows for calcium 45 and maybe a possible equation on 3/4th's scroll down?

Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points

Answers

Answer:

258.15 enjoy

Explanation:

The chemical reaction
2 H2 +O2 → 2 H20 is a:
a. synthesis reaction
b. decomposition reaction
c. single displacement reaction
d. double displacement reaction
e. combustion reaction

Answers

Answer:

double displacement reaction

2. Measure the length of a page in centimeters to the nearest tenth of a centimeter with the metric edge of a ruler. Note that nine lines divide the space between each centimeter into 10 millimeters.
The page is ____27.5____ cm long

Answers

58

Explanation:

ccause that is how long it is

Please help .. I’m really stuck

Answers

Answer:

See explanation

Explanation:

pOH = -log[OH^-]

pOH =-log[1×10^-4 molL-1]

pOH = 4

pH +pOH =14

pH = 14 -4

pH =11

b) pOH = -log[OH^-]

pOH =-log[4.9×10^-2molL-1]

pOH = 1.31

pH +pOH =14

pH = 14 -1.31

pH =12.69

c)

pH= -log[H^+]

[H^+] = Antilog [-pH]

[H^+] = Antilog [-3]

[H^+] = 1 × 10^-3 molL-1

d) pOH = -log[OH^-]

[OH^-] = Antilog[-pOH]

[OH^-] = Antilog[-10.4]

[OH^-] = 3.98 ×10^-11

[OH^-] [H^+] = 1 × 10^-14

[H^+] = 1 × 10^-14/3.98 ×10^-11

[H^+] =2.5 ×10^-4 MolL^-1

e) A solution of pH 9 is basic because the pH scale is calibrated in such as way that 0-6.9 is acidic, 7 is neutral and 8 - 14 is basic.

f)

[H^+] = number of moles/volume

[H^+] = 0.35 moles/8L

[H^+] = 0.044 MolL^-1

pH = - log [H^+]

pH = -log [0.044 MolL^-1]

pH= 1.36

The volume of a gas at 5.00 ATM is 3.5 L what is the volume of the gas at 7.00 ATM at the same temperature

A- 2.5 L
B- 5.0 L
C- 10. L
D- 12 L

Answers

B. 5.0L, i just took the test and got a 100%

Answer:

B) 5.0L

Explanation:

Like the Ford F-150 V8 Cyote 5.0L engine

What value is closest to the mass of the atom ?

Answers

Answer:

mass number

Explanation:

Answer and Explanation: The value closest to the mass of an atom is its mass number. The mass number is the total count of the protons and neutrons in the nucleus of the...

mass number

hope that helped

Which gas is produced when a carbonate undergoes thermal decomposition

Answers

Answer:

carbon dioxide gas

Explanation: This type of reaction is called a thermal decomposition. This reaction is very common in where carbon dioxide gas makes Products rise..

HELP ASSAP!!
The molecule shown is an example of a

A)

methyl ester.

B)

wax.

C)

triglyceride.

D)

sodium carboxylate.

Answers

Answer:   b

Explanation:

The molecule is WAX.

What is WAX?

Waxes consist of long-chain fatty acid attached through ester oxygen to long-chain alcohol. These molecules exist completely water-insoluble and typically solid at biological temperatures.

The main objective of the waxes is to provide a water-proof layer to the feathers, but other processes have also been suggested. Some of these lipids can also recreate a role as pheromones in sexual signaling.

the characteristics of wax are-

1. Solid at room temperature; liquid at more increased temperatures.

2. Primarily hydrocarbon in design.

3. Water repellent; insoluble in water.

4. Smooth texture; buffable under slight pressure.

5. Low toxicity; low reactivity.

To learn more about WAX refer to: https://brainly.com/question/4054549

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the ending of a compounds name that is made up of three elements,one of which is oxygen​

Answers

Answer:

—COOH

Explanation:

—COOH, acid group, containing 3 elements, C, carbon, O, oxygen, and H, hydrogen.

How many moles are in 3.45 g of Na2O?Round your answer to three significant
figures. IN A FINAL EXAM HURRY PLEASE

Answers

Answer: There are 0.056 moles present in 3.45 g of [tex]Na_{2}O[/tex].

Explanation:

Given : Mass = 3.45 g

Moles is the mass of substance divided by its molar mass.

Hence, moles of [tex]Na_{2}O[/tex] (molar mass = 61.98 g/mol) is as follows.

[tex]Moles = \frac{mass}{molar mass}\\= \frac{3.45 g}{61.98 g/mol}\\= 0.056 mol[/tex]

Thus, we can conclude that there are 0.056 moles present in 3.45 g of [tex]Na_{2}O[/tex].

How do protons and neutrons stay together in a nucleus?
A Electrostatic forces hold them together
B. Gravitational forces hold them together
C Weak nuclear forces hold them together
D. Strong nuclear forces hold them together

Answers

Answer:

strong nuclear forces that hold them together

Which is the correct Lewis dot structure of NH2-?

Answers

Answer:

A

Explanation:

because it can share and remain with ither electrons

Most terrestrial plants are members of this Division:

Bryophyta

Angiosperms

Pinophyta

Pteridophyta

Answers

Answer:

most flowering plants are classified as angiosperms

Answer:

I think the answer is Bryophyta

Explanation:

seedless,non vascular plants that are the closest extant relative of early terrestrial plants

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