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
curium-243 as a alpha decay equation
Calculate the {H+}, {OH-}, oh, pOH, and % dissociation of a 1.0x10^-3 M solution of HCl
PLEAAASSEE HELLLLLLPP !!!!!
What is the average size of the exons you used to make the coding region? What is the average size of the introns in the gene?
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
If you were scientists examining the DNA sequence of two unknown organisms that you hypothesize share a common ancestor, what evidence would you expect to find?
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
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.
What is the molar mass of Beryllium
Maria said that temperature is energy. Michael said that temperature is the measurement of energy. Make a decision as to who has the correct statement and justify your decision in two or more complete sentences.
Answer - I would think temperature is a measurement of energy, but I'm probably wrong. If anyone gets the correct answer, please correct me.
Explanation - Temperature is a measure of the average kinetic energy of the particles in an object. When temperature increases, the motion of these particles also increases.
I hope this helps, my apologies if it doesn't.
how does increasing concentration/ temperature/ surface area affect the yield of products in a chemical reaction (not reversible)
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:
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
It is becoming less expensive to screen blood samples for DNA. Certain diseases have a genetic basis. What is a possible ethical concern about the availability of inexpensive DNA testing?
people may be treated differently if certain genetic information is known about them.
DNA testing may be too slow to actually be useful to doctors.
Some diseases are not thought to have genetic causes.
Cures for diseases may be developed with help from DNA research.
Answer:
A
Explanation:
that's the right answer can't think of an explanation but it just make must sense
The results of a genetic test can confirm or rule out a suspected genetic condition. People may be treated differently if certain genetic information is known about them. The correct option is A.
What is DNA testing?DNA testing also called the genetic testing is a type of medical test which identifies the changes in genes, chromosomes or proteins. It helps to determine a person's chance of developing or passing on a genetic disorder. More than 77,000 genetic tests are currently in use.
Genetic testing is voluntary. Because testing has benefits as well as limitations and risks. The decision about whether to be tested is a personal and complex one. A geneticist can help by providing information about pros and cons of the test.
The main reason for the high cost of genetic testing is the complexity of the process involved. The cost depends on several factors like the nature of the test.
Thus the correct option is A.
To know more about DNA, visit;
https://brainly.com/question/29591100
#SPJ3
Which formula represents a molecule of 2 - chlorobutane?
if 150g of aluminum react with 101g of sulfuric acid what is the maximum amount of hydrogen gas that can be produced
What unit is used when measuring the push that causes a change to move ?
- Ohm
- Volts
- Resistance
- Pressure
What process best explains the astounding variety of dogs at a dog show? A. hybridization B. asexual reproduction C. selective breeding D. genetic engineering
The process best explains the astounding variety of dogs at a dog show is selective breeding. Therefore, option C is correct.
What is the process of selective breeding?Choose parents from a mixed population who exhibit these characteristics. They have been bred together. To produce the next generation, select the best offspring with the desired characteristics. Repeat the process for many generations until all offspring exhibit the desired characteristics.
Selective breeding within a gene pool can result in more subtle types of breed evolution, which can result in significant changes in breed type over time. In fact, few breeds have not gone through this type of evolution.
This process entails selecting and breeding animals with desirable characteristics, resulting in offspring with the same traits. When selective breeding is taken to its logical conclusion, it can result in the development of genetic disorders.
Thus, option C is correct.
To learn more about the selective breeding, follow the link;
https://brainly.com/question/461245
#SPJ6
What the significance of “Er” in the diagram
A. Average molecular
B. Threshold energy for the reaction
C. Maximum kinetic energy
D. Minimum kinetic energy
Answer:
D
Explanation:
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
Buffers resist change in pH in a system when?
a) glucose (C6H12O6) is added to the system.
b) hydrogen chloride (HCl) is added to the system.
c) sodium chloride (NaCl) is added to the system.
d) sodium bromide (NaBr) is added to the system.
Need help on all PLS HELP DO TOMORROW AND DON’T KNOW WHAT TO DO
The student's inquiry is too vague - more details about the subject or task are required to provide effective assistance.
Explanation:Unfortunately, you have not provided enough information for me to be able to assist you effectively. Please provide more detail about the topic, subject, or specific question you need help with. Remember, the more you KNOW about what needs to be done today increases the chance you'll be ready for TOMORROW. Despite the pressure, take your time to understand the task - trying to rush through without fully understanding can lead to mistakes.
Learn more about General Advice here:https://brainly.com/question/31590208
#SPJ3
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.
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 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.
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.
What factor impacts the possible number of ways in which different atoms can be put together
Answer:
the ability of atoms to combine
Explanation:
How many atoms are in 9.008 mol of Carbon?
1) Which statement is TRUE? A) Energy can be created or destroyed. B) Electrical energy is created from other forms of energy. C) Energy in a battery makes new energy called electrical energy. D) Stored energy in a battery can be transformed into electrical energy.
what is the meaning of weight?