7
Scientists use pH to describe how acidic a substance is on a scale of 0 to 14. By definition, a substance is alkaline if it has a pH of over 7.
mark me as brilliant pls ❤️
what are 7 reasons viruses can be classified as nonliving and 3 for them for being classified as living?
Answer:
Im not sure if they're all right but i hope this helps <3
Explanation:
nonliving:
- it doesn't need to consume energy to survive
- its not able to regulate its temperature
- they replicate by invading living cells
- living things have cells whereas viruses do not
- they aren't made of living cells
- they don't produce waste products
- they don't grow
living:
- they can adapt to their environment
- living things have different levels of organization and so do viruses
- viruses can infect other viruses. If a virus can get sick it should be considered a living thing.
9. Apply: Atoms are most stable when their outermost shell is full. If their outermost shell is not
full, atoms tend to gain, lose, or share electrons until the shell fills up. While doing this,
atoms react and form chemical bonds with other atoms.
Based on this, what can you infer about the reactivity of helium and neon?
Answer:
helium and neon are both noble gases their outermost shells are full or stable the elements will agree with the statement s above
advantages and disadvantages of chemistry
Answer:
Advantages of chemistry:-
•Basic knowledge of chemistry helps you to read and understand product labels.
•Chemistry can help you make informed decisions.
•Chemistry is at the heart of cooking. ...
•A command of chemistry can help keep you safe!
Disadvantages of chemistry:-
•It isn't a sustainable form of energy. ...
•It can be expensive.
•It can produce harmful waste.
•It can be used to create devastating weapons.
What does the following element description actually mean? (File below)
A. It means it is an aluminum atom with 27 protons and 13 electrons.
B. It means it is an aluminum atom with 27 electrons and 13 protons.
C. It means it is an aluminum atom with 13 neutrons and 14 protons.
D. It means it is an aluminum atom with 13 protons and 14 neutrons.
E. None of the above.
Answer:
Explanation:
This is an aluminum atom with 13 proton because from what henry said in the year 1914 he said that the number of protons of an element is equal to the number of electrons for an neutral atom..an you expect the number of electrons to be the atomic number.( The number that is used to locate the elements in the periodic table (1869).
And the number of neutron is 13 because form the mass number of the elements and we no that the mass number of an element is the sum of the proton and the neutron..MN=P + N.....so when 13 is substracted from 27 the answer is 14. So the answer is option D.
What type of volume is solid
Answer:
Fixed Volume
Explanation:
Solids have a fixed shape and occupy a fixed volume.Because the particles in liquids are very close together barely further apart than in solids, liquids do not easily compress, so their volume is fixed. Gases can also flow, so occupy the shape of their whole container. They do not have a fixed shape.
which one has minimum number of atom?
(a) 8g O2 gas
( b) 1g H gas
(c)7 g nitrogen gas
(d) 1.5 g helium gas
Answer: 1 g H2 gas
Explanation:
8g O2 = 0.25 moles
1g H2 = 0.50 moles [I assume you mean H2, not H. If it is H, then moles = 1.0 moles H
7g N2 = 0.25 moles
1.5 g He = 0.43 moles
===============
The moles above are based on molecules. All but He are multiplied by 2 to give the number of atoms. If H2 is correct, it has the greatest number of atoms. (Not if it is just H).
Need help please
Which of the following physical changes shows a change in a substance’s state of matter?
A. A piece of paper being torn in half
B. Clay being molded into a bowl
C. An ice cube being crushed
D. Liquid water becoming steam
Answer:
c
Explanation:
because when you crush an ice it would break into peace's and the ice would not be a solid
Why was the International System of Units chosen?
please answer this soon
Answer: The SI system is easier and more consistent. If the Klingons in the next galaxy know the definitions of metric, they can replicate the measures on their own planet. With English, they'd need to grab a yardstick the next time they did a crop circle.
Explanation: I'll use "SI" for the International System of Units. There are several key benefits;
Unlike the English system, there are base units that form a standard for various measures: length (meter), mass (kg), Time (sec), electric current (Ampere), temperature (Kelvin), amount of a substance (moles), and candela (luminous intensity). A system of prefixes allow the base unit to be easily changed to accomodate larger and smaller quantities. 1,000 grams is 1 kg. 1000 meters is a kilometer (km), etc. In English, it isn't so easy. An English unit of measure may read "1 mile, 34 yards, 2 feet, and 6 and 1/8 inches." In metric it would simply read 1698.5 meters, or 1.698.5 km. Imagine the difference in finding the area of a rectangle in English vs metric: Either 1) 2ft, 3 and 13/16" times 4ft, 8 and 1/16 inches, or 2) 1.833 meter by 2.877 meter.The metric system has standards that allow a high degree of calibration. Distance is calibrated to the speed of light and time is calibrated tio a vibrating atom, for example.What is the density of an object if it’s mass is 88.69g and it’s volume is 24.5mL?
Jupiter's moon Europa orbits the planet at a distance of about 671,030 km. What is the correct way to write this distance in scientific notation?
A. 67.103 x 10-4 km
B. 67.103 x 104 km
C. 6.7103 x 105 km
D. 6.7103 x 10-5 km
Answer:6.7103x10^5 km
Explanation:
The planet is at a distance of about 6.71030 ×10⁵ km. Therefore, option (c) is correct.
What is scientific notation?Scientific notation is a way of representing a quantity as a number having significant digits that are necessary for a specified degree and multiplied by ten to the power.
The general form of scientific notation can be written as [tex]N \times 10^{a}[/tex].
A significant digit is that digit in a number which adds to its precision. A significant includes all nonzero numbers, zeros between significant digits, and zeros represent to be significant while leading and trailing zeros are not significant digits as they exist only to represent the scale of number.
Given, using the scientific notation method we can write the scientific notation of the distance of 671,030 km.
The number 671,030 km can also be written as 6.71030 ×10⁵ km.
Therefore, the correct way to write this distance in the scientific notation of 671,030 km is 6.71030 ×10⁵ km.
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Write 0.034 in scientific notation.
Answer:
0.034 = 34×10^-3
Explanation:
This is because the special point is notated until it goes in front of the first counting number
Scientific notation is a way of expressing numbers that are very large or very small in a compact and standardized format. 0.034 in scientifc notation is written as 3.4 × 10⁻³
In scientific notation, a number is expressed as the product of a coefficient and a power of 10. The coefficient is a decimal number greater than or equal to 1 but less than 10, and the power of 10 represents the magnitude of the number. The power of 10 indicates the number of places the decimal point must be moved to obtain the original number.
For example:
The number 4,500,000 can be written in scientific notation as 4.5 x 10⁶, where the coefficient is 4.5 and the power of 10 is 6.
The number 0.000043 can be written in scientific notation as 4.3 x 10⁻⁵, where the coefficient is 4.3 and the power of 10 is -5.
Scientific notation allows for easy representation of very large or small numbers and simplifies calculations involving these numbers. It is particularly useful in scientific fields where values such as distances, masses, and concentrations can vary over a wide range.
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Why are weather satellites useful in areas that are affected by hurricanes?
Answer:
Since they are in a geostationary orbit, the GOES satellites provide continuous monitoring of the Earth's surface. They are able to constantly monitor the life cycle of significant weather such as hurricanes, tornadoes, flash floods, and hail storms.
Answer:
NOAA's GOES East and West satellites also show the storm's evolution by measuring infrared and visible radiation from the atmosphere and surface in real-time. These measurements tell us about wind at various levels in the atmosphere, sea surface temperatures and cloud properties.
Plz answer this question
Answer: i dont know why the metal was chosen, but the original metal used on the statue of liberty was bronze :)
Explanation:
The boiling point of ethanol is 78.40 c. A student conducts an experiment and finds a boiling point at 75.70 c. What was the percent error? (Please show work I have no idea how to do this cause we haven't learned it yet)
Answer:
[tex]\% \: error = | \frac{origina - expirimental}{original} | \times 100 \\ | \frac{78.40 - 75.70}{78.40} | \times 100 \\ = \frac{2.7}{78.4} \times 100 \\ =3.44 \\ thank \: you[/tex]
Well I need help in number 11, the equation is D=V0T
Answer:
d = 44 km (you have the answer?)
Explanation:
time = 35 minutes * 1 hour / 60 minutes
time = 0.58333 hours.
D = r * t
r = 75 km / hr
t = 0.58333 hours
d = 75 * 0.58333
d = 43.74 km
Which of the following diagrams shows a pure substance that is composed of only individual atoms and not molecules?
Answer:
Ar
Explanation:
the last one
The diagram that shows a pure substance which is composed of only individual atoms and not molecules will be: argon gas. Option D is correct.
A pure substance composed of only individual atoms is called an element. In the periodic table, each element is represented by a unique symbol, and its atoms cannot be further broken down into simpler substances by chemical means.
Liquid water: Water (H₂O) is a compound composed of two hydrogen atoms bonded to one oxygen atom. It consists of molecules, not individual atoms.
Hydrogen gas: Hydrogen gas (H₂) is composed of two hydrogen atoms bonded together to form a diatomic molecule. It is not composed of individual atoms.
Carbon dioxide GAS: Carbon dioxide (CO₂) is a compound consisting of one carbon atom bonded to two oxygen atoms, forming a molecule of CO₂.
Argon gas: Argon (Ar) is an element, and in its pure form as a gas, it exists as individual argon atoms (Ar). It is not bonded to any other atoms, and there are no molecules involved. Therefore, argon gas is composed of individual atoms and represents a pure substance.
Hence, D. is the correct option.
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Que significa HI en educación ambiental
Answer:
Um... Hello in environmental education. i think that what u said :)
Explanation:
negative
in your own words, why dose a car have
accelerction when it stops at a stop light?
Answer:
since it has lower mass. the force acting on it results in larger acceleration.
A chemist investigates the
I) melting point
II) flammability
III) boiling point
of acetone, a component of fingernail polish
remover. Which is/are physical?
1. II only
2. I and II only
3. II and III only
4. III only
5. I. II and III
6. I and III only
7. I only
8. None of these
Answer:
1, 2 & 3
Explanation:
. A chemist investigates the boiling point, melting point, and flammability
of a compound called acetone, a component of nail polish remover.
Which of these properties are physical properties and which are
chemical properties?
Physical ( boiling point and melting point ).
Chemical ( flammability )
Among the properties listed (melting point, flammability, and boiling point), only the flammability of acetone is a chemical property. The other properties (melting point and boiling point) are physical properties since they are associated with changes in state .
The correct option is 1 .
The melting point of a substance is the temperature at which it changes from a solid to a liquid state. This is a physical property because it does not involve a change in the chemical composition of the substance. However, acetone is a liquid at room temperature, and therefore, it does not have a well-defined melting point. It would vaporize (evaporate) instead of melting.
Flammability is a chemical property. It refers to the ability of a substance to undergo combustion when exposed to a flame or ignition source. It involves a chemical reaction, as the substance interacts with oxygen to produce heat and light.
The boiling point of a substance is the temperature at which it changes from a liquid to a gas state. This is a physical property, similar to the melting point, as it does not involve a change in the chemical composition of the substance.
Hence , 1 is the correct option
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6. Is there any way to predict when a specific piece of candy will land marked
side up or "decayed?" If you could follow the fate of an individual atom in a
sample of radioactive material, could you predict when it would decay?
Explain.
Answer:
No, each piece of candy has a 50% chance of decaying.No, just like the candy, each atom has a 50% chance of decaying each half-life.Explanation:
Which is true about dissolving a polar substance in water?
The solvent particles are all nonpolar molecules.
The solute particles are carried into the solution.
The solute particles have no attraction for the solvent molecules.
The solute particles are very different from the solvent molecules.
Answer: The best answer is "The solute particles are carried into solution."
Explanation: I saw "best" because I don't know how to interpret "carried into solution." Does this refer to some micro-critter putting them into wheelbarrows? But it is better than the other options. Water (the solvent particles) are all polar. The solute (stuff being dissolved) DOES have an attraction for the solvebt (water), since water is also polar. The solute particles are very different: possible, but irrwelevant. As long as they are polar, I don't care what they look like.
None of the statements are true about dissolving a polar substance in water.
What happens when a polar substance is dissolved in water?When a polar substance is dissolved in water, the solute particles get surrounded by the water molecules to form hydration shells because of strong electrostatic interactions between the polar solute and polar water molecules. This process is called solvation or hydration.
The dissolution of a polar substance in water breaks the intermolecular forces within the solute particles that leads to the development of new forces between the solute and solvent particles.
However, the solute particles have attraction for the solvent molecules. Water being a polar solvent dissolves only polar compounds, but not dissolve nonpolar compounds because of lack of strong interactions between nonpolar molecules and water to overcome the cohesive forces among nonpolar molecules.
Therefore, none of the statements are true about dissolving a polar substance in water.
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The volume of a brick is 52 cubic inches. Which choice best describes its volume?
Answer:
I think he was right but not explaining
Explanation:
I think it is C cause.... the volume of a material is the amount of matter that matterial can hold. it should the the amount of space the whole material takes up.
so C is the answer.
pls make this the brainliest.
not because it is, but because I asked.
The trachea connects the mouth to the stomach.
True or False?
HEEEEEELLLLLPPPPPPPPPPPPP MEEEEEEEEEEE :(
Answer:
false because trachea connects to the lungs and oesophagus connects from the mouth to the stomach
Answer:
false
Explanation:
It starts with the mouth. The esophagus is a long tube that connects the mouth to the stomach, which is within the ribcage. The stomach is a muscular bag-like structure and forms a J-shaped pouch and is located under the ribcage. The stomach connects to the small intestine.
define each of the terms below IN YOUR OWN WORDS
Environmental Value System:
Entropy:
Equilibrium:
Feedback:
Feedback, negative:
Feedback, positive:
Gaia:
Model:
Answer:
1- Environmental Value System or EVS is a worldview that molds the way both individuals and the societies they form perceive and therefore evaluate environmental concerns.
2-Entropy/ the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.
3-Equilibrium/a state of balance between opposing forces or actions that is either static
4-Feedback/a return of information about a result or the returned portion of a process.
5-Feedback,negative/ is a self-regulatory system in which it feeds back to the input a part of a system's output so as to reverse the direction of change of the output.
6-Feedback,positive/ is the amplification of a body's response to a stimulus.
7-Gaia/ all organisms and their inorganic surroundings on Earth are closely integrated to form a single and self-regulating complex system
8-Model/a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes.
is energy absorbed or released to separate the atoms in water molecules
Answer:
First of all, Energy is released when water molecules bond.
Explanation:
When a bond is formed its stability increases from their respective atoms. So energy is released but when we are breaking a bond we are changing a compound to a lower energy state to higher energy state it's stability decreases and requires a bit of extra energy higher stability of bond higher energy required to break it…
3x-12=0
what is the value of x
Answer:
[tex]3x - 12 = 0 \\ 3x = 12 \\ x = 12 \div 3 \\ x = 4 \\ thank \: you[/tex]
Answer:x=4
Explanation:
3x-12+12=0+12
3x=12
3x/3=12/3
x=4
if an airplane travels a distance of 500km in 5 hours, what id the average speed?
Answer:
[tex]speed = \frac{distance}{time} \\ = \frac{500}{5} = 100 \frac{km}{hours} \\ thank \: you[/tex]
32. List three examples of substances. Explain why each
is a substance. (3.1)
Answer: Chemical X H3 and f1
Explanation:
Which of these could be a measurement of an object’s mass?
a. 24 newtons
b. 24 grams per milliliter
c. 24 meters
d. 24 grams
Answer:
Mass is a measure of the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g). To measure mass, you would use a balance.
I need help on first wuestion
Answer:
Atom then element
Explanation:
Scientists once thought the most fundamental building block of matter was a particle called the atom. Now we know that the atom is made of many smaller pieces, known as subatomic particles. Every atom contains a central core called the nucleus, made of particles called protons and neutrons.
An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.
