Which of the following pH numbers are basic? (Choose 2)
11
5
7
9

Answers

Answer 1

Answer:

7 is the only basic number on a pH scale


Related Questions

You perform an experiment to determine the density of the penny in the lab. To do this you count out 10 pennies and measure their mass on an analytical balance. The mass of the 10 pennies was found to be 24.0416 grams. To determine the volume of the pennies you add water to a graduated cylinder and the volume is found to be 20.23 mL. After 10 pennies have been carefully added to the graduated cylinder, the volume is now found to be 23.13 mL. Calculate the density of the penny in g/mL and report your answer to the correct number of significant figures.

Answers

Answer:

8.29g/mL

Explanation:

Density (g/mL) = mass(g)/volume(mL)

According to this question, an experiment is conducted on the density of penny in the laboratory found out that the masses of the 10 pennies was found to be 24.0416g while the volume of the pennies is as follows:

Volume of water + graduated cylinder= 20.23 mL.

Volume of pennies + water = 23.13 mL.

Hence, volume of pennies is 23.13 - 20.23

= 2.9mL

Density = 24.042g ÷ 2.9mL

Density = 8.29g/mL

Covalent bonded atoms make up what

Answers

In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.

why metal in the middle of metal activity series can't be obtained by heating ors in air please help me I will give u branist.follow u back and give u like plz help me with a good answer​

Answers

[tex]\huge\mathsf{\red{\underline{\underline{Answer}}}}[/tex]

[tex]{\green{\dashrightarrow}}[/tex]Metals such as iron, zinc, lead, copper, etc., are in the middle of the reactivity series. These are moderately reactive metals and are usually present as sulphides or carbonates. A metal is obtained from its ore by the processes of reduction or by electrolysis.

What type of reaction is Al + KOH +H2O = K[Al(OH)4] + H2

Answers

Answer:

Al + 2 KOH + 6 H 2O → 3 H 2 + 2 K[Al(OH) 4] This is a complexation reaction: K[Al(OH) 4] is the formed complex. ; Silvery-white, malleable, ductile, odorless metal.

Explanation:

I hope this help

Which of the following elements would not be a good conductor of electricity?

sodium
iron
calcium
sulfur

Answers

Answer:

azufre

Explanation:

El azufre es un mal conductor del calor y aislante de la electricidad.


Global climate change is a result of human activity?

Answers

Answer:

Yes

Explanation:

Due to pollution, greenhouse gasses, etc

Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.

A student investigates the reaction between sodium hydroxide solution and dilute sulfuric acid.

He does a titration to find the concentration of the sulfuric acid.

(a) Give the colour change of the methyl orange indicator at the end-point.

Answers

Explanation:

the colour change will be from orange to pink

The color change of the methyl orange indicator at the end-point will show orange to pink.

What is indicator?

In an acidic or basic medium, an indicator is just a material that changes color. Indicators are termed indicators because they show one color in an acidic media and different colors in a basic medium. Indicators come in a variety of shapes and sizes: Natural indicators are indicators acquired from natural sources.

It is a just a acid base reaction in which methyl orange acts as a indicator.

In this reaction, when  sodium hydroxide solution and dilute sulfuric acid are reacts with each other then after using( indicator)methyl orange the color will be change form orange to pink which indicates the nature of solution will be acidic.

To know more about indicator.

https://brainly.com/question/12489874.

#SPJ2

Which of the following must be
TRUE if a solution is to be
considered acidic?

A. [H^+] < [OH)
B. [H^+] > [OH ]
C. KW= [H^+] /[OH]
D. [H^+] =[OH)

Answers

Answer:

c

Explanation:

kw=h+bls

Balance the equation !!!

Answers

Answer:

https://www.webqc.org/balance.php

Explanation:

this is the website i used to balance all my chem equations

i promise its not a scam its a legit website lol it works rly well

How do I calculate the pOH of a Solution at 25℃ with a [OH-1] = 6.5 x 10-9 M and state whether the Solution is Acidic, Basic, or Neutral?

Answers

Answer:

pOH = 8.19

Acidic solution (pH < 7.0)

Explanation:

The pOH of the solution is defined as:

pOH = - log [OH⁻]

Since we have [OH⁻] = 6.5 x 10⁻⁹ M, we calculate the pOH as follows:

pOH = - log (6.5 x 10⁻⁹) = 8.19

To know if the solution is acidic, neutral or basic, we have to calculate the pH from the value of pOH:

pH + pOH = 14

⇒ pH = 14 - pOH = 14 - 8.19 = 5.81

The solution is acidic because pH < 7.0.

Find the molecular weight of CO

Answers

Answer:

The molecular weight of CO is 28.01g/mole.

The molecular mass of CO is 12.01 + 16.00 or 28.01 g/mol.

how many moles are in 29.8grams of CaCl2?

Answers

Answer:

110.984  ?

i apologize if i'm wrong, you can report it if im wrong

have a good day/ night

Explanation:

10 ejemplos de disoluciones identificando el soluto y el solvente y el tipo de disolucion que corresponde

Answers

Answer:

iqjapsgvöaöqpwüsbwjwj

is the following chemical equation balanced? Please make a claim, provide evidence, and then explain
your reasoning
2Li + 2H2O → H2 + 2LIOH

Answers

The chemical equation is because why am I saying this based on my observation the right hand side of the equation is equal to the left hand side (the product is equal to the by-product)

Which of the following best describes density?

- the relationship between length and mass

- the relationship between volume and area

- the relationship between mass and area

- the relationship between mass and volume

Answers

Answer:

the relationship between mass and volume

If you react 156.0 g of calcium chloride with an excess NaOH, how much sodium chloride should you get?

Answers

Answer:

164.3g of NaCl

Explanation:

Based on the chemical equation:

CaCl2 + 2NaOH → 2NaCl + Ca(OH)2

where 1 mole of CaCl2 reacts with 2 moles of NaOH

To solve this question we must convert the mass of CaCl2 to moles. Using the chemical equation we can find the moles of NaCl and its mass:

Moles CaCl2 -Molar mass: 110.98g/mol-

156.0g CaCl₂ * (1mol / 110.98g) = 1.4057 moles CaCl2

Moles NaCl:

1.4057 moles CaCl2 * (2mol NaCl / 1mol CaCl2) = 2.811 moles NaCl

Mass NaCl -Molar mass: 58.44g/mol-

2.811 moles NaCl * (58.44g / mol) = 164.3g of NaCl

The element in group 14, period 3 of the periodic table is classified as a?

1. Metal

2. Noble gas

3. Metalloid

4. nonmetal

Answers

Answer:

It's a Metalloid

Explanation:

Predict the total pressure in Container C if the initial pressure in
Container A was tripled and Container B was reduced by one-third then
mixed together in Container C.
SHOW ALL WORK

Answers

Answer:

[tex]98 \times x6x \geqslant {36461 { {3 \frac{ \sqrt[ |?| ]{?} }{?} }^{2} }^{?} }^{2} [/tex]

okay

Calculate the amount of moles in 6.75 liters of nitrogen gas.

151 mol
.301 mol
8.44 mol
0.0215 mol

Answers

Answer:

There are 0.301 moles of N2 gas in 6.75 liters of N2 gas.

Explanation:

Given,

Volume of N2 gas = 6.75 L

We know,

At STP,

Number of moles = [tex]\frac{Volume}{22.4 L}[/tex]   [Here 22.4 liter is the molar volume of any gas at STP]

                              = [tex]\frac{6.75L}{22.4L}[/tex]

                              = [tex]0.301[/tex]

∴There are 0.301 moles of N2 gas in 6.75 liters of N2 gas.

An engine operates on a Carnot cycle that uses 1mole of an ideal gas as the
working substance and operates from a most compressed stage of 100 Nm and
327 K. It expands isothermally to a pressure of 90 Nm and then adiabatically to a
most expanded stage of 27 K. Calculate the AU, 9, and w for each step. Calculate
the net work done and the efficiency of the cycle [Cv,m for the gas) is 25 J/k/mol.​

Answers

Answer:

Step 1;

q = w = -0.52571 kJ, ΔS = 0.876 J/K

Step 2

q = 0, w = ΔU = -7.5 kJ, ΔH = -5.00574 kJ

Explanation:

The given parameters are;

[tex]P_i[/tex] = 100 N·m

[tex]T_i[/tex] = 327 K

[tex]P_f[/tex] = 90 N·m

Step 1

For isothermal expansion, we have;

ΔU = ΔH = 0

w = n·R·T·ln([tex]P_f[/tex]/[tex]P_i[/tex]) = 1 × 8.314 × 600.15 × ln(90/100) = -525.71

w ≈ -0.52571 kJ

At state 1, q = w = -0.52571 kJ

ΔS = -n·R·ln([tex]P_f[/tex]/[tex]P_i[/tex]) = -1 × 8.314 × ln(90/100) ≈ 0.876

ΔS ≈ 0.876 J/K

Step 2

q = 0 for adiabatic process

ΔU = 25×(27 - 327) = -7,500

w = ΔU = -7.5 kJ

ΔH = ΔU + n·R·ΔT

ΔH = -7,500 + 8.3142 × 300 = -5,005.74

ΔH = ΔU = -5.00574 kJ

convert 0.75km to meter​

Answers

Answer:

[tex]0.75 \times 1000 = [/tex]

Explanation:

Use ur calculator

Answer:

750m

Explanation:

1 km is equal to 1000m. Therefore all you have to do is multiply 0.75 by 1000 and you will get 750. Hope this helps! :)

Does heat flow out of the atmosphere (HQ)
change during the day?



Answers

Answer:

The heat flow into Earth's atmosphere varies as the Sun rises and sets, gradually increasing during the day and falling to zero at night.

Explanation:

Heat radiates from the ground into the lower atmosphere. In conduction, heat moves from areas of more heat to areas of less heat by direct contact. Warmer molecules vibrate rapidly and collide with other nearby molecules, transferring their energy.

If the last carbon atom of an unsaturated fatty acid is bonded to two hydrogen atoms and one carbon atom, what type of bond must exist between the last carbon and the other carbon atom

Answers

Answer:

Double bond

Explanation:

Carbon is a tetravalent atom. This implies that the carbon atom always forms four covalent bonds.

These four covalent  bonds may be single, double or triple bonds. Compounds that contain double and triple bonds are said to be "unsaturated".

If the last carbon atom of an unsaturated fatty acid is bonded to two hydrogen atoms and one carbon atom, it means that the bond between the last carbon and the other carbon atom must be a double bond because carbon must be tetravalent and we have already been told that the fatty acid is unsaturated.

The last carbon atom of the unsaturated fatty acid must form two covalent bonds to the other carbon atom in order to respect the tetravalency of carbon.

Answer:

Double bond

Explanation:

its in the book

EASY 100 POINTS, WILL MARK BRAINLEST, 2 QUESTIONS, SHOW YOUR WORK OR NO POINTS

Answers

Answer:

Explanation:

1. Please provide the enthalpy info - I will work on it with the info

2.

i) Reaction a should be modified to match the number of S in equation:

 2S + 2O2 -> 2SO2     deltaH = -370kJ

ii) Reaction b should be written reversely to match the reactants of SO2:

 2SO2 + O2 -> 2SO3     deltaH = 256kJ

iii) Adding the equations together:

 2S + 3O2 -> 2SO3

iv) Enthalpy of the combined reaction = -370+256 = -114kJ

 It is negative so the reaction is exothermic.

Answer:

Explanation:

1 c. enthalpy change = enthalphies of formation of all products - enthalphies of formation of all reactants =  -526.3 kcal/mol

1 d. C3H8(g) + 5 O2 (g) → 3 CO2 (g)  + 4 H2O (l)    ΔH = -526.3 kcal/mol

How did Rutherford's work help form the present-day model of the atom?​

Answers

Answer:

Rutherford overturned Thomson's model in 1911 with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.

Explanation:

Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure.

What is diffusion? How does the motion of gas molecules explain how a gas diffuses throughout a room?

Answers

Answer:

Diffusion in gases

Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions

Explanation:

hope this helps

Use an example of how we use an informal kind of scientific method in our everyday lives

Answers

Answer:

baking cookies

Explanation:

One example of using a scientific method is baking cookies. You make a hypothesis that you cookies will be done in 15 minutes. Then, after 15 minutes, you see that either your hypothesis was correct and you cookies are perfect or you need to bake them longer making you hypothesis incorrect. (please change the wording up a bit if you want. i tried to make it make the most sense)

Answer:

Explanation:

When you loose your phone. You try to remember where you last used your phone, and question yourself where you might have left it. If you say that you probably left it in the kitchen, that would be like your hypothesis. Then you go look for it where you thought you left it which would be your experiment. If maybe it is not there that would be like your conclusion so you would reject your hypothesis because it was wrong. Then you try the scientific method again but with a different hypothesis, like that maybe you left it in the living room. You do your experiment which is when you go look for it. In the conclusion if your hypothesis was right you accept your hypothesis. That can be an example of how we use the scientific method in our everyday lives.

The diagram represents a beaker containing sugar,water, and sand. The sugar is dissolved in the water, creating a solution. The sand has settled to the bottom of the beaker. Describe one method to separate the sand from the other substances in the beaker.

Answers

Answer:

boiling

Explanation:

because heat dissolve sugar and not dissolve sand

One method to separate the sand from the other substances in the beaker is filtration.

What is separation?

A separation process is a method for separating two or more separate product mixtures from a mixture or solution of chemical ingredients.

To put it another way, it's a scientific method for discriminating between two or more substances in order to achieve purity. On of the simple method of separating sand from the solution of water and sugar is filtration. As sand is insoluble in water so by the use of filter we can separate out sand.

Hence one separation method is filtration.

To know kore about separation, visit the below link:

https://brainly.com/question/15193293

#SPJ2

how to write electronic configuration.

Start from scratch
Coz I am fresher


Answers

Answer:

the electrons in the innermost shell of an atom are called core electrons while the electrons in the outermost shell are called Valence electrons the arrangement of electrons in the shells of an atom is known as electron configuration.

A Cartesian Diver demonstrates which of the following?
A. the inverse relationship of Boyle's law
B. the direct relationship of Boyle's law
C. squeezing the bottle, pushes the test tube down.
D. the density of a gas is less than the density of water.

Answers

Answer:

(a) The inverse relationship of Boyle's law.

Explanation:

A Cartesian diver is used in scientific experiments to demonstrate the certain principles in science such as;

i. The principle of floatation or the Archimedes' principle.

ii. The implication of the ideal gas law as seen in, for example, Boyle's law and pressure law,

iii. Pascal's principle.

The diver demonstrates that given a large soft drink bottle containing water and a medicine dropper at its top, squeezing the bottle pushes the dropper down to the bottom. When the squeezing stops, the dropper comes back to the top again.

Now using this to demonstrate Boyle's law (which shows the relationship between pressure and volume where increase in one results in the decrease in the other), when the bottle is squeezed (which means pressure is increased on the bottle), the water is forced into the medicine dropper thereby decreasing the volume of air in the dropper. Removing pressure on the bottle produces an opposite effect.

Other Questions
se lanza un cuerpo desde el origen con velocidad horizontal de 40 m/s, y con un ngulo de 60. calcular la mxima altura y el alcance horizontal. A sealed container contains a sample of air. The average speed of a hydrogen gas molecule in this container is 2222 meters per second. What is the average speed of a nitrogen gas molecule, in meters per second , in the container What is most likely to happen if an individual restricts consumption of dietary fat to very low levels?A. development of scurvyB. development of atherosclerosisC. loss of insulation around vital organsD. loss of hemoglobin from red blood cells I usually go to school. change to present simple. What is mass incarceration and how does mass incarceration stem from racism? Indira Gandhi was assassinated by a member of her bodyguard becauseshe had been accused of corruption.she was too hard on opponents.of religious conflict.of economic hardships. Remote Control Corporation sends a post-purchase questionnaire to all consumers who buy their products. They are interested in gathering data on product quality, customer service orientation, and customer satisfaction. This is an example of 22.At the end of each year for the next 18 years, you receive cash flows of $3700. The initial investment is $25,200 today. What rate of return are you expecting from this investment? Answer as a whole percentage13.07% A is a finite non-empty set. The domain for relation R is the power set of A.(Recall that the power set of A is the set of all subsets of A.) For X A and Y A, X is related to Y if X is a proper subsets of Y (i.e., X Y). Choose the description that accurately describes relation R. a. Symmetric and Reflexive b. Anti-symmetric and Reflexive c. Symmetric and Anti-reflexive d. Anti-symmetric and Anti-reflexive Which of the following sentences is grammatically correct?O Las espinacas son sanasO Las espinacas son sanesLas espinacas es sanaLas espinacas son sanos The question is in the pic plz help!!!!!!!!!!!!!! While Alison is developing a presentation on avoiding unhealthy behaviors, she is surprised by the misconceptions that high schoolstudents seem to have. These erroneous beliefs lead to an increase in unhealthy behavior such as drinking, drug use, and riskysexual behavior. Which statement is not a belief that leads to unhealthy behavior?2A)Peer and societal norms are secondary guides to follow.B)Real or perceived peer pressure to conform to the norm.Thoughts that acceptance only comes from being the same.DA belief that most people engage in unhealthy behaviors. write down the multiples of three from 474 to 483 Is 10 teraflops good? How much does the best PC in the world have? which statement best describes how the author develop the central idea of the passage?IREADY 7 ptsYou are making hamburgers for a barbeque with your family and bought 10 2/3 pounds of ground beef. If you want to make 1/3 pound hamburgers, how many burgers can you make from the pounds of ground beef? Don't worry. Zombies eat brain. You are safe.Which tone is used? And why? what factors led to the decline of the mycenaeans HELP!!! im running out of timestudent is selected at random what is the probability the student is a female junior Find the value of x that will make A||B5x +.20A-7B3x + 60x = [?]Enter