Radiocarbon dating can be used to determine the age of a fossil because the amount of carbon-14 found in the fossil...
a. increases steadily over time.
b. decreases steadily over time.
c. is unaffected by time.
d. remains the same for the first 10 years, and then rapidly decreases.
Answer:
B
Explanation:
Carbon-14 will steadily decrease in a dead organism. Fossils are no different. Sense it's dead already, it will still be getting rid of the last bit of carbon-14 it has in a steadily way.
Bonds occur to make atoms more stable. Covalent bonds occur between _____
Question 41 options:
metals and noble gases because valence electrons are given to noble gases
metals and nonmetals because valence electrons are given to metals
nonmetals and nonmetals because valence electrons are shared
metals and metals because valence electrons are shared
Answer:
nonmetals and non metals because valence electrons are shared
Explanation:
please take note that ionic bond only occur between nonmetals and metals whereas covalent bonds only occur between nonmetals and nonmetals
According to the kinetic-molecular theory, the collision between two ideal gas particles is a result of
Answer:
Neither Attraction Nor Repulsion
Explanation:
To start off,
Kinetic Molecular Theory:
A theory that describes the behavior, interaction, and movement of gas molecules; based on the idea that particles of matter are always in motion; the relationship between the microscopic qualities and the macroscopic qualities of a gas.Repulsion:
Repulsion in chemistry stands for the force which exists between two bodies that have the same electric charge or the same magnetic polarity, this force tends to repel the bodies and separate them from each other.Attraction:
The attraction of the negatively charged electrons that are circling the nucleus and the positively charged protons that are inside the nucleus provokes a pill that creates a chemical bond.To finish,
Gas particles move at random, which means there are no attractive forces between them or in their surroundings. The entire kinetic energy of two particles is preserved when they collide.
Answer:
Neither attraction nor repulsion.
Explanation:
Just took the test!
6.0 L of gas in a piston at a pressure of 1.0 atm are compressed until the volume is 3.5 L. What is the new pressure inside the piston?
From the calculations and by the use of Boyles law, the new pressure of the gas is 1.7 atm
What are gas laws?The term gas law is used to demonstrate the relationship between the volume, pressure, number of moles and temperature of a gas.
Using the Boyles law;
P1 = 1 atm
P2 = ?
V1 = 6 L
V2 = 3.5 L
P1V1= P2V2
P2= P1V1/V2
P2= 1 atm * 6 L/3.5 L
= 1.7 atm
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Which element is number 14 on the periodic table?.
Answer:
Silicon
Explanation:
When viewing the periodic table of elements and locating atomic number 14, you will find that the element present is Silicon (Si), of which is within the metalloid elemental group.
How can we prevent coral reefs from dying in the first place?
Explanation:
1. Reduce your carbon footprint
Carbon emissions also increase ocean acidity, which can impact corals and the species that depend on them.
Walking, biking, riding public transportation and carpooling are all ways you can reduce your carbon footprint
2. Conserve water to reduce pollution
All water winds up in the ocean, and pollution drives much of the damage to reefs. And runoff is what carries nutrients and contaminants into the sea.
Using less water can help minimize these impacts.
3. Get engaged
Through civic and political engagement, you can help shape your community in ways that reduce negative impacts on coral reefs. Volunteering, voting and running for public office are all ways you can become more engaged and magnify your impact on a wide range of issues.
4. Support sustainable fishing
Overfishing has a dramatic impact on coral reefs. By making informed choices about the fish you purchase and eat, you can contribute greatly to ocean health.
5. Support sustainable development and tourism
By doing research, speaking out and making informed choices when you visit tropical reefs, you can make a big impact
6. Help inform the public
Educating others about the crisis facing coral reefs is a vital part of building support, engagement and the political will to fight the human-caused pressures that are devastating reef ecosystems.
What was in Flint's water that caused 12 people to die?(1 point)
lead
total triahalomethanes
Legionella pneumophila
Escherichia coli
The presence of lead in Flint's water is what caused the death of 12 people.
Option A.
What was in Flint's water?The Flint water crisis started in 2014 when the city of Flint, Michigan, switched its water source from Lake Huron to the Flint River as a cost-cutting measure.
The water from the Flint River was more corrosive and caused lead to leach from the pipes, contaminating the drinking water. This led to high levels of lead in the drinking water, which is a potent neurotoxin that can cause a variety of health problems, particularly in children.
The contamination also led to an outbreak of Legionnaires' disease, a severe form of pneumonia, which was linked to at least 12 deaths in the area.
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When placed in a cloud chamber, a radioactive substance does which of the following?
a. Leaves a trail of condensed water vapor.
b. Produces an electric current.
c. lonizes chemicals on the film present in the chamber.
d. Causes a liquid to reach its boiling point.
Which of the following is not a type of energy
A. Heat from an oven.
B. Electricity in a power cord.
C. Light from a lightbulb.
D. Smoke from a fire.
Answer:
smoke from a fire Is not an example of energy
Which two of the following correctly describe a solution?
A. All solutions are in the liquid phase.
B. The solubility of a solute in a particular solvent is affected by temperature.
C. A solution consists of a solute and solvent.
D. The solubility of a solute in a particular solvent is affected by the densities of the
solute and solvent.
Answer:
C and A
Explanation:
i think it is because a solution is a mix of a solute and solvent, dont judge me if its wrong
Define density please thanks!!
Sam and Albert reacted 3.5 moles of hydrogen gas with an excess of oxygen and had a percent yield of 85%. How many moles of water did they actually produce
The mole of water Sam and Albert produced would be 3.5 moles
Mole ratioFrom the balanced equation of the reaction:
[tex]2H_2 (g) + O_2 (g) --- > 2H_2O (l)[/tex]
The mole ratio of hydrogen to water is 1:1.
Thus, if 3.5 moles of hydrogen gas is reacted with excess oxygen, 3.5 moles of water will also be produced.
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witchh organsim primary cosumers
Answer:
Primary consumers are herbivores, feeding on plants
Explanation:
:)
Primary consumers are at the second trophic level of the food pyramid. This means that they eat producers. An example of a primary consumer would be a grasshopper eating grass. Primary consumers get eaten by secondary consumers, such as a rabbit who eats grass, and the rabbit gets eaten by a fox.
What is the formula for calculating the change in thermal energy?
Answer: :Change in thermal energy = mass x specific heat capacity x change in temperature.
Explanation: what it basically means is mass x heat x the change in temperature.
Does sodium fluoride follow the octet rule? If not, which exception is it?
Answer:
Sodium fluoride (NaF) does indeed follow the octet rule without any violations.
What kind of water is found in littoral zone of a lake?
The littoral zone of a lake is the area closest to the shore. It has very little biological activity but includes a lot of oxygen. The water in the lake's littoral zone is freshwater, free of living organisms such as plants and fish.
Imagine that the human population continues to increase, but we don't monitor or implement strategies to minimize our impact on the blue crab population.
Construct an argument supported by evidence for how increases in human populations impact the consumption of natural resources. In your answer, be
sure to include:
• the relationship between human populations and the consumption of resources
• a prediction of how the blue crab population would change with an increasing human population
evidence from the resources explored during the lesson
scientific reasoning
Answer:
The Explanation
Explanation:
:i imagine less blue crabs ngl
17. Explain How is a change in oxidation number related to the process of oxidation and reduction?
Answer:
Explanation:
A change in oxidation number represents a transfer of electrons between atoms/ions. This is what happens during oxidation and reductions, where electrons are gained and lost (respectively).
Which equation represents a combustion reaction?
1) 4fe + 3o2 = 2fe2o3
2) 2h2o = 2h2+o2
3) 2agno3 + h2s = ag2s + 2nho3
4) 2al + n2= 2aln
Answer:
2
Explanation:
do take note that combustion reactions releases oxygen.
How many moles of gas will occupy a volume of 2.5 l at 12.0 atm and 25c?
Answer:
1.23 moles
Explanation:
Ideal gas law
PV = n RT R = .082057 L-atm/mol-K
25 C = 298.15 K
12 (2.5) = n (.082057) (298.15) n = 1.23 moles
Why do fireworks produce heat when they explode?
Which of the following happens when a reaction reaches dynamic equilibrium in a closed system?
A) The concentrations of the reactants and products increase.
B) The concentrations of the reactants and products remain constant
C) The rate of the forward reaction is faster than the rate of the reverse reaction.
D) The rate of the forward reaction is slower than the rate of the reverse reaction
Answer: B
Explanation:
At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, and thus the concentrations of the reactants and products must be constant.
Two children on roller skates stand facing each other. The child on the right puts her arms out and pushes away from her partner. What is the action and reaction
Answer:
They both go backward because of force.
Explanation:
The logic behind this answer is that child right and pushes away causing her to go backward meaning her partner is being pushed backwards to.
(Hope this was helpful!)
Atoms of arsenic (As) are often added to silicon (Si) in a process called doping to change the conductivity of the silicon. How does the addition of arsenic change the conductivity of silicon?
An atom of arsenic has one fewer valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom gains an electron.
An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom loses the electron.
An atom of arsenic has one fewer valence electron and fewer electron shells than an atom of silicon, so the conductivity increases because the arsenic atom gains an electron.
An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity increases because the arsenic atom loses the electron.
Answer:
B.) An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom loses the electron.
Explanation:
Silicon is located in the 3rd row and 14th column in the periodic table. Arsenic is located in the 4th row and 15th column in the periodic table. This means that arsenic has one more valence electron than silicon. Since arsenic is located one row down from silicon, its valence electrons occupy higher energy orbitals.
Silicon maintains a crystal-like lattice structure. Each silicon atom is covalently connected to assume this shape. When silicon gains one extra electron from arsenic, it experiences n-type doping. This new electron is not tightly bound in the lattice structure. This allows it to move more freely and conduct more electricity. This can also be explained using band gaps. Silicon, which previously had an empty conduction band, now has one electron in this band. This lowers the band gap between the conduction and valence bands and increases conductivity.
Answer:
its d
Explanation:
Why do medical implants and prosthetics should be carefully designed when placed inside or on the surface of the body?
Answer:
because it needs to fit exactly into how your body is like
Explanation:
Which scientist provided a foundation for John Dalton’s work on the atomic structure?
Robert Millikan
Joseph Proust
Ernest Rutherford
J. J. Thomson
Answer:
J.J. Thomson
Explanation:
Answer:
D
Explanation:
took the test
kindly help me
i am confused
i will mark you brainlist
Explanation:
a) 2 (Cr)³+ + 3 BiO3- + 4 H+ → 3 (Bi)3+ + Cr2O72- + 2 H2O
b)
have posted a similar question in the image for the phosgene i hope it helps little
Question 1 (1 point) Which of the following summarizes cellular respiration?
Oxygen reacts with glucose to produce carbon dioxide and water, and release energy.
Light energy is changed into chemical energy.
Chemical energy is changed into light energy.
Light energy is used to join water and carbon dioxide to make oxygen and glucose
Answer:
oxygen reacts with glucose to produce carbon dixiode into water and release energy. It is 1
Explanation:
It is A
Explanation:
How many grams is 3.2 moles of water
Answer:
similarly 1 mole of water is equivalent to molecular mass of water x 3 that is 18x3=54 gram
Explanation:
A mole is known by what other name?
Answer: avogadros number/constant
Explanation: