Definition: One of a class of elements having properties intermediate to metals and nonmetals.
Answer:
Metalloids
Explanation:
Metalloids are compounds whose properties are intermediate between those of metals and non metals. That is, they do not behave as pure metals, neither do they behave as pure nonmetals. For instance, the electrical conductivity of metals decreases with temperature while nonmetals do not conduct electricity at all under any condition. However, metalloids conductivity increases with increase in temperature because they conduct electricity in a manner slightly different from the manner in which metals conduct electricity.
Which of the following is not true of a scientific theory? It can be disproven or changed as new evidence is discovered. It must be supported by many scientific investigations over time. It can become a law once it is proven by several experiments. It must be verified by scientists around the world.
Answer:
It must be verified by scientists around the world.
Explanation:
A theory is a rational and plausible explanation of a certain phenomenon that occurs in the universe and that can be explained scientifically.
The theory is formulated after certain experiments have been done, however, it is not considered an absolute truth, as it can be motivated through the years by other experiments and with the advancement of technology. In that case, a theory can be refuted and reframed as new evidence is discovered. In addition, in order for it to remain relevant, it must be supported by many scientific investigations over time, until the moment comes when the experiments comprised 100% of this theory, allowing it to start being called "Scientific Law". However, it is not necessary for all scientists in the world to test the theory in their experiments.
1. (10 pt) How are elements arranged in the Periodic Table? A. by their properties B. alphabetically C. by how much they are worth D. in the order they were discovered 2. (10 pt) Which is the correct symbol for the element silicon? A. SI B. S C. Si D. Sil 3. (10 pt) All atoms of an element are ________ . A. flammable B. visible under a microscope C. alike D. different 4. (10 pt) Elements that are usually shiny and good conductors of heat and electricity are known as ________________. A. gases B. metals C. solids D. nonmetals 5. (10 pt) The most recent model of an atom is the _______________. A. Bohr model B. Einstein model C. Nucleus model D. Electron Cloud model 6. (10 pt) Elements that are usually dull, brittle, and do not conduct electricity are known as A. gases B. metals C. solids D. nonmetals 7. (10 pt) Elements join together to form A. compounds B. ions C. protons D. atomic masses 8. (10 pt) Which picture best shows an atom? A. B. C. D. 9. (10 pt) In order for a chemical reaction to take place, a certain amount of _______________ must be present. A. heat B. friction C. chemicals D. energy 10. (10 pt) Enzymes are ____________ in the body that speed up chemical reactions. A. catalysts B. cells C. concentrations D. chloroplasts
An empty plastic bottle is sealed in a cool room and then moved to a very hot room. What can best be stated about the air pressure inside the bottle when the bottle reaches room temperature? It is lower than the pressure on the outside of the bottle. It is higher than the pressure on the outside of the bottle. It is the same as the pressure on the outside of the bottle. It exerts twice the force per unit area as the air pressure outside the bottle.
Answer:
It is higher than the pressure on the outside of the bottle.
Explanation:
After the sealed bottle is moved from a cool room to a very hot room, the temperature of the inside gas increase. Gay-Lussac's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant. Therefore, the pressure in the bottle increase.
how many neutrons does the most common isotope of hydrogen have?
The most common isotope of hydrogen, called Protium, has no neutrons, only a single proton in its nucleus. Protium accounts for approximately 99.985% of all hydrogen atoms.
The most common isotope of hydrogen is called Protium. This isotope has only one proton in its nucleus and no neutrons. In contrast, the isotopes Deuterium and Tritium have one and two neutrons respectively. Protium makes up about 99.985% of all hydrogen atoms.
How are ionic bonds formed
Answer:
Ionic bonds are formed by the transfer of valence electrons (those that can move free) between certain type of atoms, these exchange generates two iconic atoms with opposite charge.
So, basically, the transfer of this electrons is how is formed.
Which formula represents a molecule of 2 - chlorobutane?
the smallest particle of a substance that still retains the properties of that substance
Answer:
It is molecule
Explanation:
Just had it on study island :)
if 150g of aluminum react with 101g of sulfuric acid what is the maximum amount of hydrogen gas that can be produced
What is the different types of technology used for cloning animals?
Final answer:
Reproductive cloning involves creating an identical copy of a multicellular organism, overcoming the mix of DNA in sexual reproduction. Techniques like Somatic Cell Nuclear Transfer (SCNT), used to clone Dolly the sheep, along with gene cloning and PCR, are crucial in this biotechnological process.
Explanation:
Various Types of Technology Used for Cloning Animals
The process of creating an identical copy or a clone of an entire multicellular organism is known as reproductive cloning. This biotechnological method has enabled scientists to overcome the barrier of sexual reproduction, which mixes the DNA of two parents making the creation of an identical organism through natural means impossible. One of the most famous examples of reproductive cloning is Dolly the sheep, cloned in 1996 from an adult somatic cell.
Techniques Used in Animal Cloning
Somatic Cell Nuclear Transfer (SCNT) - This involves removing the nucleus from a donor egg cell and replacing it with the nucleus from a mature somatic cell of the organism to be cloned. The embryo is then implanted into a surrogate mother. This was the technique used to create Dolly.
Gene cloning - Though more commonly applied at the molecular level to clone genes, this technique can also lay the groundwork for further cloning processes by allowing the replication of specific desirable traits.
Polymerase Chain Reaction (PCR) - While not a cloning technique per se, PCR is a crucial method in genetic engineering and biotechnology for amplifying DNA segments, which is a foundational step in many cloning procedures.
Reproductive cloning and its techniques, like Somatic Cell Nuclear Transfer (SCNT), have opened new possibilities in the field of genetics, agriculture, and medicine by allowing the cloning of animals. These advancements put into practice the theory of artificially inducing asexual reproduction in mammals, as seen in the successful cloning of Dolly the sheep and several other animals since then.
One method of preparing ClO2 is by the reaction of chlorine and sodium chlorite: Cl2 (g) + 2 NaClO2 (s) → 2 ClO2 (g) + 2 NaCl (s) If you allow 15.0 g of NaClO2 to react with 2.00 L of chlorine gas (Cl2) at a pressure of 1.50 atm and at 21 oC, how many grams of ClO2 can be prepared?
To determine the grams of ClO2 that can be prepared from the given reaction, use stoichiometry. First, calculate the moles of NaClO2 and ClO2 using their molar masses and given mass. Finally, calculate the mass of ClO2 using the moles obtained.
Explanation:To determine the grams of ClO2 that can be prepared from the given reaction, we need to use stoichiometry. First, we need to calculate the moles of NaClO2 using its molar mass (74.44 g/mol) and its given mass (15.0 g). moles = mass / molar mass = 15.0 g / 74.44 g/mol = 0.201 mol.
Next, we use the balanced equation to determine the mole ratio between NaClO2 and ClO2, which is 2:2. So, the moles of ClO2 produced are also 0.201 mol.
Finally, we can calculate the mass of ClO2 using its molar mass (67.45 g/mol) and the moles obtained. mass = moles * molar mass = 0.201 mol * 67.45 g/mol = 13.53 g ClO2.
Calculate the {H+}, {OH-}, oh, pOH, and % dissociation of a 1.0x10^-3 M solution of HCl
how does increasing concentration/ temperature/ surface area affect the yield of products in a chemical reaction (not reversible)
How many calories are required to raise the temperature of 105 g of water from 30.0°C to 70.0°C?
Bill and Tom are both towing wagons. Bill's wagon weighs 10 pounds, and Tom's wagon weighs 20 pounds. Bill is pulling his wagon with twice the force that Tom is. How do the wagon speeds compare? A) Both wagons will be moving at the same speed. B) Bill's wagon is moving 4 times faster than Tom's. C) Tom's wagon is moving 4 times faster than Bill's. D) Bill's wagon is moving 2 times faster than Tom's.
Answer:
B) Bill's wagon is moving 4 times faster than Tom's.Explanation:
The motion of the wagons is determined by the net force that acts upon them, according to Newton's second law of motion:
Force = mass × acceleration ⇒ acceleration = Force / massFrom your data, you can fill this table to compare the accelerations:
Bill's wagon Tom's wagon
mass (lb) 10 20
force 2F F
acceleration 2F/10 F/20
Find the ratio between both accelarations:
Bill's wagon acceleration / Tom's wagon acceleration(2F/10) / (F/20) = (2 × 20 / 10 ) = 4Meaning that the acceleration of Bill's wagon is 4 times the acceleration of Tom's wagon.
Assuming, that both wagons start from rest, you can obtain the speeds from the kinematic equation for uniformly accelerated motion:
Speed = acceleration × time, V = a × t.Call the acceleration of Tom's wagon X, then the acceleration of Bill's wagon will be 4X.
So, depending on the time, using V = a × t, the speeds will vary:
t (s) 1 2 3 4
Speed Tom's wagon X 2X 3X 4X
Speed Bill's wagon 4X 8X 12X 16X
Concluding that Bill's wagon is moving 4 times faster than Tom's (option B).
Answer:
B
Explanation:
USATESTPREP
Which organs are part of the musculoskeletal system? Check all that apply.
bones
hair
muscles
skin
tendons
nails
Answer:Bones,muscles, tendons are part of the musculoskeletal system
Explanation:
Musculoskeletal provides support, form, stability and movement to the body.It is made up of skeletal bones, muscles, cartilages, tendons, ligaments and other connective tissues that supports and binds the organs together.
So from the given list of organs the part of the musculoskeletal system are:
Bones,Muscles, tendons
Warwick Police discovered the body of a 36-year-old white male (later identified as Darren Davis) in a field about 20 miles north of town. Mr. Davis’s body was discovered at 7:30 p.m. on Friday, October 11. He was found lying face up on a yellow king-size sheet. According to autopsy reports, one fatal gunshot to the back of the head ended Mr. Davis’s life. Scientists estimate that his death occurred at about 4:20 p.m. As investigators scanned the crime scene, they made the following notes:
Paper plates filled with partially eaten fried chicken, deviled eggs, potato salad, and chocolate cake were located near Mr. Davis’s body.
An open bottle of red wine and two partially filled glasses of wine were found next to the yellow sheet.
A recently-smoked cigarette butt was found near the sheet.
Shoeprints from the road to the field were those of a male, size 10, and a female, size 5. The only shoeprints from the field back to the road were those of a female, size 5.
Car tracks of the same wheel base and tread pattern as Mr. Davis’s automobile were found at the road. The car was not found at the scene.
Mr. Davis’s car was found abandoned in an empty parking lot in downtown Warwick.
Investigators believe that a female friend of Mr. Davis was responsible for his demise. After questioning family and friends, it was discovered that the deceased had frequent social outings with 6 women who live in or near Warwick. The women’s names are Sue, Laura, Gwen, Beth, Eliza, and Patty. Investigators gathered the following information about the 6 women:
Beth works full-time as a caterer.
Eliza and Gwen are schoolteachers.
Sue’s babysitter says Sue arrived home in her own car at about 5 p.m.
Patty and Eliza live together in a two-bedroom apartment in downtown Warwick.
Gwen lives in a nearby town called Jordan.
Eliza and Beth are very petite women—they wear size 4 blue jeans.
Gwen and Patty are smokers.
Sue’s father owns a gun shop.
Eliza attends a 5 p.m. step aerobics class in downtown Warwick every Friday afternoon and has not missed a class in two years.
Patty is deathly allergic to grapes.
Laura works at a chemical supply house.
Sue lives in a country house about 30 miles west of Warwick.
Gwen is a vegan (does not eat any animal products).
Sue is a florist.
Beth doesn’t know how to drive.
Eliza and Gwen hate the color yellow.
Laura played center for a semiprofessional basketball team 5 years ago. She has red hair and is 6 feet, 1 inch tall.
Based on the preceding information, determine who murdered Mr. Davis and give the general facts of the case.
"I think Sue was the one who killed Mr. Davis"
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PLEASE HELPPP MEEEE
An unknown substance is cooled from 25 °C to 10 °C. The table below shows the state of the substance at different temperatures.
Time (minutes) Temperature (degrees Celsius) State of matter 0 25 Liquid 2 23 Liquid 4 18 6 18 8 18 10 15 Solid 12 10 Solid
Which statement is correct about the unknown substance?
Its freezing point is 23 °C.
Its freezing point is 18 °C.
The substance sublimes at 23 °C.
The substance exists as a gas at 18 °C.
The second statment is true and right. Hope this helps!!
Answer: Option (b) is the correct answer.
Explanation:
Freezing point is defined as the point at which liquid state of a substance changes into solid state.
So, in the given table it is shown that at temperature [tex]18^{o}C[/tex] the substance is changing into solid state. Whereas at [tex]23^{o}C[/tex] the substance is in liquid state.
Hence, [tex]18^{o}C[/tex] will be the freezing point of the substance.
Thus, we can conclude that the statement its freezing point is [tex]18^{o}C[/tex], is correct about the unknown substance.
Consider the everyday hazardous substances in and around your home. All BUT ONE is a guideline for using, storing and disposing of hazardous household chemicals safely.
Answer:
D) Clean up any chemical spill immediately. Dispose of cleaning rags immediately by placing them in a sealed plastic bag.
Explanation:
Please, put the answer choices next time, just to simplify things. I really hope I did this right.
Answer:
D) Clean up any chemical spill immediately. Dispose of cleaning rags immediately by placing them in a sealed plastic bag.
Explanation:
Clean up any chemical spill immediately. Dispose of cleaning rags immediately by placing them in a sealed plastic bag. This is partially true. You SHOULD clean up chemical spills immediately. Then allow the fumes in the rags to evaporate outdoors before disposing of the rags by wrapping them in a newspaper and placing them in a sealed plastic bag. Then place the sealed bag in your trash can outdoors.
- thank you
hydrochloric acid reactys with zinc meetal. whichwould increase the reactin rate the most?
"The correct option is increasing the surface area of the zinc metal.
Increasing the surface area of the zinc metal provides more area for the hydrochloric acid molecules to collide with, thus increasing the number of effective collisions per unit time. This can be achieved by using zinc powder or by cutting the zinc metal into smaller pieces, which exposes more zinc atoms to the acid. According to the collision theory, this increase in surface area leads to an increased reaction rate because more reactant molecules can be involved in the reaction at any given time. Increasing the concentration of hydrochloric acid would also increase the reaction rate, as it would increase the number of hydrochloric acid molecules available to collide with the zinc surface.
However, this would not have as dramatic an effect as increasing the surface area of the solid zinc metal.
What unit is used when measuring the push that causes a change to move ?
- Ohm
- Volts
- Resistance
- Pressure
A student is shown a simple model of particles that make up a liquid,as shown.
How should the model be changed to show the particles of a solid?
A. Increase the velocities of the particles, and increase the space between the particles
B. Increase the velocities of the particles, and decrease the space between the particles
C. Decrease the velocities of the particles, and increase the space between the particles
D. Decrease the velocities of the particles, and decrease the space between the particles
How many neutrons does an element have if its atomic number is 40 and its mass number is 154
The element has 114 neutrons.
The atomic number of an element is the number of protons found in the nucleus of an atom of that element. It is denoted by the symbol Z and uniquely identifies a chemical element.
To find the number of neutrons, we will subtract the atomic number from the mass number.
Atomic number (Z) = 40 (This is the number of protons)
Mass number (A) = 154 (This is the total number of protons and neutrons)
Number of neutrons = Mass number - Atomic number
Number of neutrons = 154 - 40
Number of neutrons = 114
What factor impacts the possible number of ways in which different atoms can be put together
Answer:
the ability of atoms to combine
Explanation:
which of the following biomes likely has the thinnest layer of topsoil
A. tropical rainforest
B. deciduous forest
C.grassland
D. desert
binds t? Carbon monoxide poisoning occurs when a dangerous amount of carbon monoxide binds to _____ and reduces the body's ability to use _____ effectively in respiration. A. hemoglobin, oxygen B. oxyhemoglobin, oxygen C. hemoglobin, carbon dioxide D. oxyhemoglobin, carbon dioxide
Which group of items all contain a transparent part with at least one curved surface to refract light?
A. A human eye, a diving mask, and a telescope
B. A microscope, a camera, and a window pane.
C. An owl's eye, a smart phone, and a magnifying glass
D. An electron microscope, safety goggles, and eyeglasses
Will mark as Brainliest.
What type of substance would be best for use in a cooling system?
a liquid with a high specific heat
a gas with a low specific heat
Please explain your answer.
Answer:
a liquid with a high specific heat
Explanation:
Hugh described two substances which participate in photosynthesis.
Substance A: Source of energy for plant-eating animals
Substance B: Combines with sunlight and carbon dioxide
Which statement is correct?
A. Substance A is water and Substance B is oxygen.
B. Substance A is glucose and Substance B is water.
C. Substance A is water and Substance B is chlorophyll.
D. Substance A is chlorophyll and Substance B is oxygen.
The answer is B because glucose is an energy source and during photosynthesis, water combines with sunlight and carbon dioxide. You can observe by the chemical equation for photosynthesis : 6CO2 + 6H2O + light energy = C6H12O6 + 6O2
B. Substance A is glucose and Substance B is water.
How many atoms are in 9.008 mol of Carbon?