Ionic compounds tend to be ...
A. Hard
B. Soft
C. Bendable
Answers
Answer:
A
Explanation:
Answer:
A. Hard
Explanation: got it correct on Edg
Related Questions
4.16 Unit Test: Chemical Bonding - Part 2 1. You are studying alkaline earth metals bonding with Halogens. Using your knowledge of the ionic bonding, what specific and testable scientific question could be asked about the salt formation
Answers
A testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
A scientific question is a question that can be answered by experiments. In other words, a scientific question must be empirical. Its answer can only be obtained by carrying out experiments.
In the case of bonding in alkaline earth metals, the kind of bond formed is ionic. Ionic compounds are soluble in water. Hence, a testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
This can be answered by dissolving several salts of alkali earth metals in water.
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Read the two statements given below. Statement 1: All living matter at the smallest level is made of cells Statement 2: New animal cells are formed from pre-existing animals Which of the following best relates the statement to the correct type of theory?
PLS I NEED HELP
Answers
Answer:
Statement 1: All living matter at the smallest level is made of cells
Explamation:
All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.
Hope this helps
Answer:
I would say A or C
Explanation: Because Statement 1 sounds like an everyday theory and my other question is Both because they sound the same but... I'm really confused about these Questions Hope I will find my answer
And Please mark me as brainliest
Select all that apply. which valences have the greatest tendency to form ions?
a. +1, -1
b. +2, -2
c. +3, -3
d. +4, -4
Answers
Valences have the greatest tendency to form ions, are, +1,-1,+2,-2,+3,-3. All the options are correct.
Valence is the number of electrons lost or gained in a reaction to complete an element's outer energy level.
When an atom gains or loses a valence electron, it forms an ion. Atoms form ions in order to help another to obtain a full octet and to stabilize the valence.
Some atoms gain or lose electrons to form ions because they need to become more stable. They sometimes give them to have an outer shell or gain them to get a closer charge to eight.
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Answer:
+1,-1,+2,-2,+3,-3
Explanation:
6. Draw the structural formula for the compound with the condensed formula CH3-COCH2CH3. What type of compound is this?
Answers
A hydrocarbon that contains four carbon atoms with single bonds is a butane. In this case, its name has to end with -one because it contains a ketone functional group. Therefore, its name is butanone.
The structural form of the butanone is
Given that the compound is formed by Carbon, Oxygen, and Hydrogen molecular compounds because they are formed by nonmetals.
Identify indicators of a chemical reaction. Check all of the boxes that apply.
Two clear liquids are combined. A green solid forms.
color change
absorption of heat
formation of precipitate
formation of gas
Blobs of green solid are shown in clear liquid in a test tube.
Answers
Answer:color change and formation of precipitate.
Explanation: The reaction of products of the chemical reaction may have different properties
Which of the following is a product of the
photoelectric effect?
A. a neutral atom
B. ejection of a proton
C. ejection of a neutron
D. an ion
Answers
Photoelectric effect is the ejection of electrons from the metal surfaces, when light hos on it. The ejection of electrons makes the surface metal atoms to produce ions. Hence, D is correct.
What is photoelectric effect ?The phenomenon of ejection of electrons from the surface of a metal when light of a suitable frequency falls on it is called photoelectric effect. Upon striking the surface of metals , light can set up an electric current which current which corresponds to the flow of electrons. This phenomenon is discovered by Einstein
For instance, visible light can cause ejection of electrons from the surface of metal like cesium which has low ionization enthalpy. This phenomenon is related to the observation that if light is considered as particles.
The particles of light is then called as photoelectrons or photons. Photoelectric effect thus, produce the metal ions by ejecting electrons from the atom.
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Succinic acid dissociates as follows: H₂C4H4O4+H₂O HC4H4O4 + H3O+ Ka1 = 6.2 × 10-5 HC4H4O4+H₂0 C4H4O42- + H3O+ Ka2 = 2.3 x 10-6 Calculate Kb1 and Kb2 for the following reactions (3 points): C4H4042 + H2O HC4H4O4 + OH- Kb1 = ? HC4H4O4+H₂O H2C4H4O4 + OH- Kb2 = ?
Answers
Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9. The basicity constant, or Kb, is a measure of the strength of a base in a particular chemical reaction. The products of a reaction of a weak base and water with the corresponding acid determine the base constant.
For example, for a given acid and base, Kb1 and Kb2 are the basicity constants for the first and second base dissociations, respectively, of the base. The formulas and charges of the conjugate acid and base, as well as the acid dissociation constants, Ka1 and Ka2, are needed to calculate Kb1 and Kb2.
The following reactions are balanced chemical reactions that represent the dissociation of succinic acid:
Reaction 1: H2C4H4O4(aq) + H2O(l) ⇌ HC4H4O4(aq) + H3O+(aq) Ka1 = 6.2 × 10−5
Reaction 2: HC4H4O4(aq) + H2O(l) ⇌ C4H4O42-(aq) + H3O+(aq) Ka2 = 2.3 × 10−6
The values of Ka1 and Ka2 can be used to calculate Kb1 and Kb2, respectively, using the following equation:
Ka1 × Kb1 = Kw
where Kw is the ion-product constant for water, which is 1.0 × 10−14 at 25°C.
Kb1 can be calculated as follows:
Kw = Ka1 × Kb1
Kb1 = Kw / Ka1
Kw = 1.0 × 10^-14
Ka1 = 6.2 × 10^-5
Kb1 = Kw / Ka1
Kb1 = 1.0 × 10^-14 / 6.2 × 10^-5
Kb1 = 1.61 × 10^-10
Kb2 can be calculated using the same method:
Kw = Ka2 × Kb2
Kb2 = Kw / Ka2
Kw = 1.0 × 10^-14
Ka2 = 2.3 × 10^-6
Kb2 = Kw / Ka2
Kb2 = 1.0 × 10^-14 / 2.3 × 10^-6
Kb2 = 4.35 × 10^-9
Therefore, Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9.
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Match the following terms to their units. A. Atomic mass B. Molarity C. Molar mass - mol/liter amu g/mol ne relationship between the atomic mass of an element and a mole point)
Answers
The matching is like :- (A) Atomic mass - amu (atomic mass units) (B) Molarity - mol/liter (C) Molar mass - g/mol (grams per mole)
The atomic mass (in amu) is used to convert between the mass of an element and the number of moles of that element, while the molar mass (in g/mol) is used to convert between the mass of a compound and the number of moles of that compound. Molarity (in mol/L) is used to express the concentration of a solution. In chemistry, the atomic mass of an element is the mass of a single atom of that element relative to the mass of a carbon-12 atom, which is defined as exactly 12 atomic mass units (amu). The atomic mass is typically given in units of amu, and it is used to convert between the mass of an element and the number of moles of that element. Molarity is a unit of concentration that is commonly used in chemistry. It is defined as the number of moles of solute per liter of solution. The unit for molarity is mol/L, which is often abbreviated as M. Molar mass is the mass of one mole of a substance. It is expressed in units of grams per mole (g/mol). The molar mass is used to convert between the mass of a compound and the number of moles of that compound. For example, if we know the atomic mass of an element (in amu), we can use it to calculate the molar mass of that element (in g/mol). Similarly, if we know the molarity of a solution (in mol/L) and the molar mass of the solute (in g/mol), we can calculate the mass of the solute in a given volume of the solution.
In summary, the atomic mass, molarity, and molar mass are all important concepts in chemistry that are expressed in different units. Understanding these units and how to use them is essential for many calculations in chemistry.
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what is the energy that travels from sun in the form of waves
Answers
Answer:
longwaves or solar radiation
Answer:
Solar Radiation
Explanation:
There could actually be different ways to say this anwser. This was just how I leaned It In school! :)
(a) Why are the working tables and shelves in chemistry laboratory
covered with tiles and not wood or metals?
Answers
Answer:
They may have a corrosive action on the wood. They may react with the metal and may produce hazardous gases which can cause harm to us. This is not the case with tiles
Explanation:
HOW IS PHENOTYPE DIFFERENT THAN GENOTYPE?
Answers
Answer: The genotype is the set of genes in our DNA which is responsible for a particular trait. The phenotype is the physical expression, or characteristics, of that trait. For example, two organisms that have even the minutest difference in their genes are said to have different genotypes.
test help
What charge would Ca have in CaI2
A) 1+
B)2+
C)1-
D)2-
E) Calcium would not have any charge
Answers
i took this test
What is the main factor that determines how well two substances mix together?
Answers
Answer:
I believe it is density.
Explanation:
Hope this helps!
Absolute zero is defined as the theoretically lowest attainable ______, ______.
Answers
Absolute zero is defined as the theoretically lowest attainable temperature, which is -273.15 K or 0 degrees Celsius.
Absolute zero is the temperature at which the particles of a substance have minimum kinetic energy, and hence, the substance has minimum internal energy. This temperature is the lower limit of the thermodynamic temperature scale, and it is denoted as 0°C (-273.15 Kelvin).
Absolute zero is equivalent to -273.15 K or 0 degrees Celsius, which is the point at which all molecular motion ceases. It is impossible to reach absolute zero in practice, although scientists have been able to cool certain substances to within a few billionths of a degree of it.
Therefore the answer is the lowest attainable temperature, which is -273.15 K.
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1.2.5 Practice: Chemistry in the World Chemistry Sem 1 Points Possible:25
Question 2: Scientists Observe Patterns and Rules
Observations of the physical world lead to the discovery of patterns. Understanding patterns leads to the discovery of rules. Understanding rules leads to the discovery of how the physical world works.
a. Patterns in nature involve anything that happens over and over again. A pattern could repeat itself at a specific time of day, time of the month, or time of year. Describe one of these kinds of patterns. (Example: A full moon occurs every 28 days.) (1 point)
b. What rule does the pattern you picked above point to? (Example: The appearance of a full moon every 28 days means that the moon orbits the Earth every 28 days.) (1 point)
Question 3: The Scientific Method
a. The Question:
In 1988, three gray whales were trapped in Arctic ice. Television crews captured the frantic attempts of hundreds of people to save the whales. Eventually, a Soviet icebreaker and U.S. National Guard helicopters arrived to help free the whales. The cost of the rescue mission exceeded $5 million.
i. Write a scientific question related to the whale story. (1 point)
ii. Write a nonscientific question related to the whale story. (1 point)
b. The Hypothesis:
Your little sister asks you a scientific question: "Does chocolate milk come from brown cows?" In order to answer the question, you decide to form a hypothesis.
Explain whether or not the following statements are effective hypotheses.
i. Brown cows produce chocolate milk. (1 point)
ii. Brown cows never produce chocolate milk. (1 point)
iii. Brown cows produce white milk. (1 point)
c. The Experiment:
i. A student conducts an experiment to determine whether adding salt causes water to boil more quickly. The student plans to heat two pots of water and measure how long they take to boil. One pot has salt in it and the other does not. The pot of water with salt added is the experimental group. The pot of water without salt is the control group. For the boiling saltwater experiment described, list three things that would make the control group ineffective. (1 point)
•.
•.
•.
ii. How might data for this experiment be organized to help look for patterns? (1 point)
iii. Why is peer review important? (1 point)
Question 4: History of Chemistry
a. How did Aristotle's idea of matter differ from that of scientists? (1 point)
b. Why wasn't alchemy considered a "real" science? (1 point)
c. Why is modern chemistry considered scientific? (1 point)
Question 5: Chemicals in Our World
a. A sign above a supermarket display of oranges reads:
Organic Produce
No chemicals were used to harvest this fruit!
How accurate is this claim? Why or why not? (1 point)
b. Name one way chemicals can help the environment. (1 point)
c. Name one way chemicals can hurt the environment. (1 point)
Question 6: Chemicals and Safety
a. Name a chemical or product that was once considered safe but is now considered harmful. (1 point)
b. Name a chemical that is safe to use in food in small amounts. (1 point)
c. Why do chemists routinely test existing chemicals? (1 point)
Question 7: The Scientist and Society
a. How do ethical guidelines make science safer? (1 point)
b. How does government funding affect scientific progress? (1 point)
c. In what way do scientists help the government do its work? (1 point)
d. What obligations do scientists have to society? (1 point)
Answers
One way chemicals can help the environment is by using synthetic pesticides and fertilizers to increase crop yields while minimizing water usage. This helps to reduce the land area needed for farming, which in turn reduces deforestation. It also decreases the need to clear additional land for cultivation, which reduces greenhouse gas emissions and helps to prevent soil erosion. Additionally, some chemicals can be used to clean up contaminated soil and water sources, such as in the case of oil spills or industrial pollution.
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Two biologists, two chemists, and two physicists go out to dinner and sit at a round table with 6 equally spaced chairs. In how many ways can they sit so that no two scientists of the same type (for example, two biologists) are seated next to each other? (Two seatings that are merely rotations of each other are not considered distinguishably different.)
Why is my approach wrong?
I first seat the biologist to one of the seats, he has one choice. I then seat the other biologist, he has 3 choices. Next, I seat one of the chemists, who has 4 choices. The next chemist then has to choices. Finally, we have the physicists who have no choice but to be in the two remaining seats.
1*3*4*2 = 24.
Why is the answer 32? Please explain, thanks
Answers
By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.
Your approach is incorrect because it does not consider all possible arrangements that satisfy the given conditions. Let's analyze your approach step by step.
You correctly start by seating one biologist, which can be done in 1 way. However, when you proceed to seat the second biologist, you assume that there are 3 choices. This is where the error occurs.
Consider the following possibilities:
If the first biologist is seated at Chair 1, the second biologist cannot be seated at Chair 2 or Chair 6, as they would be sitting next to each other. Therefore, the second biologist can only be seated at Chair 4.
If the first biologist is seated at Chair 2, the second biologist can only be seated at Chair 5.
If the first biologist is seated at Chair 3, the second biologist can only be seated at Chair 6 or Chair 1.
If the first biologist is seated at Chair 4, the second biologist can only be seated at Chair 1.
If the first biologist is seated at Chair 5, the second biologist can only be seated at Chair 2.
If the first biologist is seated at Chair 6, the second biologist can only be seated at Chair 3.
So, there are actually 6 different arrangements for seating the two biologists.
Now, if we continue with your approach, seating the chemists and physicists, we need to consider the additional possibilities that arise due to the constraints of the biologist's seating arrangements.
Therefore, the correct approach would involve considering all possible arrangements that satisfy the given conditions. By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.
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Most chemical bonds are
Select one:
O a purely ionic.
stion
O b. purely covalent.
O c. partly ionic and partly covalent.
Od, metallic.
Answers
Answer:
partly ionic and partly covalent
After the removal of carbon, the oxygen in co2 ends up.
a. true
b. false
Answers
The given statement, After the removal of carbon, the oxygen in CO₂ ends up is False.
Carbon dioxide (CO₂) is a compound made up of two elements, carbon and oxygen, in a ratio of one carbon atom for every two oxygen atoms. When carbon dioxide is removed, the oxygen atoms do not remain isolated - instead, they bond with other oxygen atoms from the surrounding environment, forming oxygen gas (O₂).
Oxygen gas is highly reactive and forms strong bonds with other oxygen atoms to form molecules of the natural gas O₂. The result is that the oxygen that was part of the carbon dioxide is no longer present - it has become part of the newly formed oxygen gas molecules.
Oxygen gas is present in the atmosphere and it is highly reactive and mobile, meaning that it can quickly move and form bonds with other elements. When carbon dioxide is removed, the oxygen atoms that were part of the molecule become part of oxygen gas instead, creating molecules of the natural gas O₂.
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How many moles of oxygen
react with 37.5 moles of sulfur
dioxide in the production of sulfur
trioxide gas?
Answers
Answer:
1 L of O2 reacts with 2 L of SO2.
Explanation:
From the balanced equation, 1 mol of oxygen
reacts with 2 mol sulfur dioxide.
Directions:Complete the statements in your activity notebook.
I have learned that the solar system ____________________________________
____________________________________________________________________
___________________________________________________________________.
Pls answer it so i can give you (55 points) :]
Answers
The solar system is made up of the sun and everything that orbits around it, including planets, moons, asteroids, comets and meteoroids.
What is the solar system?The sun together with the group of celestial bodies that are held by its attraction and revolve around it
I have learned that the solar system has many planets that can be dangerous for people to live in and there are many things hidden out there that mankind or scientists are not known about, many planets with different kind of names, and there is a lot of stars, comets, asteroids and meteorites everywhere.
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Sean is moving heavy furniture by sliding it
across the floor. He puts a blanket
underneath the furniture. Why did this help
him?
Answers
Answer:
the blanket let's him slide it across the floor because the has less friction with the floor than the furniture.
Answer:
Blanket underneath the furniture may reduce the kinetic friction
Explanation:
When sliding an object across a surface, the force of kinetic friction will oppose the movement of the object.
By placing a blanket between the object and the surface, the kinetic friction coefficient may be reduced.
Therefore, putting a blanket underneath the furniture may reduce the kinetic friction coefficient, then making it easier to slide the forniture.
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which element is most likely to form three covalent bonds?
Answers
Answer:
phosphorus which is in group 5A is most likely to form three covalent bonds
How to balance the equation Mg2+HO2=Cu3O+H2
Answers
I’m really not sure though so it might be wrong… I’m not the best at balancing equations lol
please help quickly
Rubia was given a type of inclined plane called a ramp in her science class. Her teacher told her that the ramp should have a mechanical advantage of 3.
Rubia pulled a block up the ramp, but afterward she calculated that the mechanical advantage of the ramp was 2.8 instead of 3. Her teacher said she did not make a mistake. What did Rubia calculate?
A.
the actual operating power of the ramp
B.
the actual mechanical advantage of the ramp
C.
the ideal mechanical advantage of the ramp
D.
the ideal operating power of the ramp
Answers
Answer: B. The actual mechanical advantage of the ramp.
Explanation:
The professor saying that the ramp SHOULD have a mechanical advantage of 3 indicates that that would be the ideal mechanical advantage. Since Rubia calculated it to be 2.8, that means that it is the acutal mechanical advantage. The actual advantage will be reduced from the ieal due to things like friction.
Is changing the color of the coin from copper to silver a physical or chemical change?
Answers
Answer:
physical
Explanation:
The zinc (which was already silver) coated the penny. The NaOH dissolved the zinc. (that was what made the water murky) And small pieces of zinc adhered to the penny (coated) It was a physical change because no NEW color was created.
will the pillow be able to be comfortable while sleeping at night even though it has water inside?
Answers
Answer:
no it will not be.
Explanation:
as the Water will be squishy and the cotton will be wet it will not be comfortable.
What moon phase would be 14 days after this phase
Answers
If the current moon phase is full moon, then 14 days later the moon phase would be a new moon. This is because the lunar cycle lasts approximately 29.5 days, and half of that is 14.75 days, which rounds down to 14 days.
After a full moon, the moon goes through its waning phases and eventually becomes a new moon.
A first-quarter moon is so named because it has completed one-quarter of its lunar cycle, which lasts around 29.5 days. The right side of the moon is lighted during this phase, giving it the appearance of a "D" shape.
The moon will transition to its next phase, known as "waning gibbous," around 7 days later. The moon is now partially illuminated, but as it approaches the "full moon" phase, it becomes less illuminated.
It is significant to note that due to the intricate connections between Earth's orbit around the sun and the moon's orbit around the planet, the precise time of the various lunar phases might change somewhat from month to month.
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Why is quantum of energy important?
Answers
Answer/Explanation:
quantum of energy is important because the energy of a particle, and also how long it has had that energy, with infinite precision. Quantum, in physics, discrete natural unit, or packet, of energy, charge, angular momentum, or other physical property. the term also applicable to quanta of other forms of electromagnetic energy such as X - rays and gamma rays.
please help Why can we listen to radio or watch TV indoors?
A. It will work as long as the room has hardwood.
B. Walls absorb most of the incoming waves
C. It will work as long as the room is carpeted.
D. Walls don’t absorb the incoming waves
Answers
Answer:
D
Explanation:
A: not true. You could have cement floors and still receive radio/TV
B: not true. Very little of the waves are absorbed by the walls.
C: not true. You can receive radio/TV if there isn't a carpet in the entire house.
D: Dis the answer. Walls don't absorb the incoming waves or not much of them
When a predetermined level of ionization is reached in the ionization chamber, what does the machine do?
Answers
When a predetermined level of ionization is reached in an ionization chamber, the machine typically triggers a response or action based on the intended purpose of the device or system.
The specific action taken can vary depending on the application and design of the machine. Here are a few examples;
Radiation Monitoring; In radiation monitoring devices or systems, an ionization chamber is often used to detect and measure radiation levels. When the ionization chamber detects a predetermined level of ionization, it may activate an alarm or warning signal to alert operators or individuals of potentially hazardous radiation exposure.
Particle Detection; Ionization chambers are also used in particle detectors to measure the passage of charged particles. When a predetermined level of ionization is reached, the machine may initiate data recording or trigger further analysis of the detected particles.
Feedback Control; In certain industrial or scientific processes, ionization chambers are integrated into feedback control systems. When the ionization level reaches a set threshold, the machine may automatically adjust process parameters, such as flow rates, voltage, or radiation shielding, to maintain a desired condition or response.
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