Answer:
B. Slightly acidic
Explanation:
pH can be defined as a measure of the negative logarithmic concentration of hydrogen ion (H+) in an aqueous solution.
Basically, the pH scale is used to measure the level of acidity or basicity of an aqueous solution based on a scale of 0 to 14.
An acidic solution has a pH lower than 7 (0 - 6), a basic solution has a pH higher than 7 (7 - 14) and a neutral solution has a pH of exactly 7.
In this scenario, a student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. Therefore, this sample of water can be said to be slightly acidic its pH is slightly below 7.
1. You are pushing a heavy shopping cart full of water bottles with a constant force. The shopping cart has
mass of 250 kg and it is accelerating down the aisle at 0.20 m/s? How much force are you exerting?
Answer:
F = 50 N
Explanation:
Given data:
Mass of car = 250 Kg
Acceleration of car = 0.20 m/s²
Force required = ?
Solution:
Formula:
F = m×a
F = applied force
m = mass
a = acceleration
Now we will put the values in formula.
F = 250 Kg × 0.20 m/s²
F = 50 Kg.m/s²
Kg.m/s² = N
F = 50 N
Which of the following elements has the lowest ionic radius?
Answer:Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest. So the asnwer is helium
Explanation:
What is the frequency of a photon whose energy is 5.4 ´ 10-19 J? (h = 6.626 ´ 10-34 J·s)
Answer:
8.15 x 10¹⁴Hz
Explanation:
Given parameters:
Energy of photon = 5.4 x 10⁻¹⁹J
h = 6.626 x 10⁻³⁴J.s
Unknown:
Frequency of the photon = ?
Solution:
The energy of a photon is given as;
E = hf
h is the Planck's constant
f is the frequency
f = [tex]\frac{E}{h}[/tex] = [tex]\frac{5.4 x 10^{-19} }{6.626 x 10^{-34} }[/tex] = 8.15 x 10¹⁴Hz
28. Which statement is INCORRECT regarding radiation?
a. Thicker materials offer better shielding against radiation
b. Gamma radiation is the only type that can cause health effects
c. Traveling further away from a source of radiation reduces your exposure
d. Each type of radiation can be detected by a device called a Geiger counter
Answer:
Radiation is energy. It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines. Radiation travels from its source in the form of energy waves or energized particles. There are different forms of radiation and they have different properties and effects.
Related information in Spanish (Información relacionada en español)
On this page:
Ionizing and non-ionizing radiation
Electromagnetic spectrum
Types of ionizing radiation
Periodic Table
Non-Ionizing and Ionizing Radiation
There are two kinds of radiation: non-ionizing radiation and ionizing radiation.
Non-ionizing radiation has enough energy to move atoms in a molecule around or cause them to vibrate, but not enough to remove electrons from atoms. Examples of this kind of radiation are radio waves, visible light and microwaves.
Ionizing radiation has so much energy it can knock electrons out of atoms, a process known as ionization. Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes. Ionizing radiation comes from x-ray machines, cosmic particles from outer space and radioactive elements. Radioactive elements emit ionizing radiation as their atoms undergo radioactive decay.
Radioactive decay is the emission of energy in the form of ionizing radiationHelpionizing radiationRadiation with so much energy it can knock electrons out of atoms. Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes.. The ionizing radiation that is emitted can include alpha particles, beta particles and/or gamma raysHelpgamma raysA form of ionizing radiation that is made up of weightless packets of energy called photons. Gamma rays can pass completely through the human body; as they pass through, they can cause damage to tissue and DNA.. Radioactive decay occurs in unstable atoms called radionuclides.
Explanation:
Complete the sentences
( solid, liquid or gas)
What do you notice about the temperature?
(increases or decreases)
What do you notice about the movement of the molecules and the spacing between the molecules?
( INCREASES or DECREASES)
1. When you
click on the yellow button,
The solid becomes
Liquid
The temperature
increases
The movement of the molecules ____increases__________________
and the space between molecules __increasing_____________________
2. When you click on the green button
The liquid becomes
Gas
The temperature
increases
The movement of the molecules ______increases________________
and the space between molecules ________________________
3. Click on the yellow button again
And the gas becomes
liquid
The temperature
decreases
The movement of the molecules ______________________
and the space between molecules ________________________
4. Click on the red button,
And the liquid becomes
The temperature
The movement of the molecules ______________________
and the space between molecules ________________________
Answer:
xcvbn
Explanation:
nkj
Answer:
what he said
Explanation:
What effect does pressure have on a gas in a
closed container?
Answer:
La presión de un gas en un recipiente cerrado es inversamente proporcional al volumen del recipiente, cuando la temperatura es constante.LÑÑ
Explanation:
El volumen es inversamente proporcional a la presión: Si la presión aumenta, el volumen disminuye. Si la presión disminuye, el volumen aumenta.
Fossil fuels were formed when living things (plants and animals) died and their remains were broken down. This is an example of _______.
A. Combustion
B. Decomposition
C. Photosynthesis
D. Cellular Respiration
The Law of Superposition allows us to determine:
a
which rock layers are the oldest
b
the relative age of layers of rocks and the fossils in them
c
the exact or absolute age of rock layers
d
a and b are correct
Answer:
d . a and b are correct
Explanation:
The law of superposition allows us to determine the age of rock layers and also that of the fossils within them.
The law of superposition states that "in an undeformed sequence of strata, the oldest rock layer is at the bottom and the youngest is on top".
Using this law, geochronologists can determine the relative ages of rock layers. The youngest layer will be found on top. The oldest at the bottom of the sequence. The arrangement of the layers and the fossils there in can also tell us about the ages of the fossils themselves.How can you tell which elements form chemical bonds?
Answer: The number of bonds that an element can form is determined by the number of electrons in its valence shell. Similarly, the number of electrons in the valence shell also determines ion formation.
Explanation:
How much force is required to accelerate a 2 kg mass at 3 m/s²?
Answer:
6 N
Explanation:
Force (Newtons) = mass (kg) times acceleration (m/s2)
2 kg x 3m/s2 = 6 kg/m/s2
Metals are found on the left-hand side of the periodic table. True or False
Answer:
true pls mark brainiest
Explanation:
3. What type of particles move to create electicity?
Electrical energy is caused by moving particles that have a negative or positive charge. These charged particles are called electrons. The faster the electrons are moving, the more electrical energy they carry. Electrical energy commonly moves through a wire in an electrical circuit.
[tex]\huge\boxed{Electrons.}[/tex]
_____________________________________Explanation...Electrons are particles that move to create electricity. In other words, they are responsible for electric currents. Thus, the answer should be Electrons.
_____________________________________[tex]\boxed{Hope\;i\;helped!}\\\\\\\huge\boxed{Thanks,Plip.}[/tex]
Which of the following of elements would have all four valence electrons
B, Si, As, Te
C, Si, Ge,Sn
O, S, Se, Te
Ga, Ge, As, Se
Answer:
D
they are used for manufacturing Of diodes
Answer:
is the answer D
Explanation:
hsjskajdidbxksbsvzjwvshhz7duw
Melting chocolate (a change of state) is an example of a
PLease help I need to get this test done and whoever helps first I will mark brainliest Love you!!!!!
Answer:
moon
Explanation:
Answer:
Explanation:
its the moon. the moon covers the sun causing it to be completely blakened out. and if thats not right then lifes a lie cuz i got blinded pretty bad in one of my eyes for looking at it with it
What would happen if we couldn't carry respiration out?
Answer:
There would be no energy for cellular activities
Explanation:
Cellular respiration is the process whereby living organisms breakdown ingested food in their cells in order to obtain energy in form of ATP. In other words, respiration converts the stores energy in food molecules into usable energy by the cell. The general equation of the process is as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O
The process of cellular respiration is carried out by every living organism in order to obtain energy to perform their various metabolic activities. Hence, without RESPIRATION, there would be no energy (ATP) for use by the cell, which utterly means no cellular activities will take place.
What are the lowest ratio of coefficients needed to balance the equation below? __ CaCl2 + __Al --> __AlCl3 + __Ca
2.911 grams of ethanol C2H5OH is burned and produces how many grams of water vapor?
Please help me or I'm dead.
Answer:
3.4g
Explanation:
Given parameters:
Mass of ethanol = 2.911g
Unknown:
Mass of water vapor = ?
Solution:
To solve this problem, let us write the balanced reaction equation first;
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
Now find the number of moles of ethanol;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol
Number of moles = [tex]\frac{2.911}{46}[/tex] = 0.06mole
So;
1 mole of ethanol will produce 3 moles of water vapor
0.06mole of ethanol will produce 0.06 x 3 = 0.19moles of water vapor
Mass of water vapor = number of moles x molar mass
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of water vapor = 0.19 x 18 = 3.4g
POSS
Explain when gold is considered an element and when it is considered a solution.
Answer:
Gold is an element even when it is in a solution
It has been windy in Wren’s town. Wren wants to know how fast the wind is moving. Which tools could he use?
Answer:
We can use a fan, divide the number of times that fan spins by the time it takes and the speed is obtained
Using just the valence electrons on each atom determine which 2 atoms should be in the same group?
atoms 1 and 2
atoms 3 and 4
atoms 2 and 3
O atoms 1 and 4
Answer:
Explanation:
Atom 1 and 4 because they have the same number of valence elctrons in its outermost shell
HELP PLEASE!!!
HCl is _____.
a base
a neutral
an acid
Answer:
an acid
Explanation:
Hydrochloric acid or muriatic acid is a colorless inorganic chemical system with the formula HCl. Hydrochloric acid has a distinctive pungent smell. It is classified as strongly acidic and can attack the skin over a wide composition range, since the hydrogen chloride completely dissociates in an aqueous solution. Wikipedia
Diamond cannot conduct electricity but graphite can,why
Diamond does not conduct electricity because it has no delocalized electron to conduct electricity.
What is a chemical formula?
Answer:
A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.
Explanation:
How many miles of sodium chloride are produced when 2.9 grams of sodium iodide reacts? __ mol NaCl
2 Nal(s) + Cl2(g) = 2 NaCl(s) + l2(g)
**Report your answer to the correct number of significant digits!
Answer: I am trying 0.88 if it is correct then I will edit this to say that!
Explanation:
the left-right inversion one word answer
Answer:
Lateral Inversion
Explanation:
Where is there higher air pressure, above the land or above the water?
Answer:
The air above land also warms faster than air above the sea. Cooler higher pressure air above the ocean moves toward warmer lower pressue air above land.
Answer:
Use the sources to help you, but I would say above the water.
Explanation:
"However, water heats up much more slowly than land and so the air above the land will be warmer compared to the air over the ocean. The warm air over the land will rise throughout the day, causing low pressure at the surface. Over the water, high surface pressure will form because of the colder air."
AND
"The depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes. With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude."
I hope this helps you!
Which of the following would you get from playing too much tennis?
A. Cerebral Palsy
B. Muscular Dystrophy
C. Tendonitis
D. ALS
Answer:
cerebral palsy
Explanation:
Psychology!! Will mark BRAINLIEST!!
Explain the three measures of retrieval and forgetting that Herman Ebbinghaus studied using nonsense syllables.
Answer:
There are three measures of retrieval and forgetting: recall, a measure in which an individual brings learned information back to conscious awareness; recognition, a measure in which a person identifies previously learned information; and relearning, a measure in which a person is asked to learn information a second time.
Explanation:
Answer:
Responses may vary but should include some or all of the following information:
There are three measures of retrieval and forgetting: recall, a measure in which an individual brings learned information back to conscious awareness; recognition, a measure in which a person identifies previously learned information; and relearning, a measure in which a person is asked to learn information a second time.
Explanation:
edge
How many electrons surround the
nucleus of an atom of Thallium?
Answer:
81
Explanation: