HELP ASAP PLSSSS WILL BE MARKED BRAINLIEST
Which of the following is an example of a chemical change?
A piece of paper being cut into multiple pieces
Butter melting after being in the microwave for 30 seconds
Nails rusting over time as they are exposed to oxygen
Sugar dissolving in water
Answers
Answer:
Nails rusting over time as they are exposed to oxygen
Explanation:
New substance with new property is formed
It have also changed the chemical property of the substance
It is difficult to reverse the change etc...
Related Questions
Charlotte Hornets NBA BASKETBALL TEAM
Answers
Answer:
I've heard both good and bad things about them! I'm going to go educate myself now
Explanation:
:)
Answer:
How good are they?
Explanation:
A book on a table presses downward with a force equal to the upward force exerted by the table. This is an example of Newton's ___ law of motion.
Answers
Answer: Newton's 3rd law of motion.
Explanation: Because the book is pressing with an equal as the table it is the 3r law. Newton's 3rd law of motion states that for every action there is an equal and opposite reaction.
A book on a table presses downward with a force equal to the upward force exerted by the table. This is an example of Newton's third law of motion.
Newton's 3rd law states for every action, there is an equal and opposite reaction.
__________ properties explain how matter changes its identity to form a new substance.
phase
chemical
physical
reaction
Answers
Answer:
chemical properties explain how matter changes its identity to form a new substance.
The chemical properties explain how matter changes its identity to form a new substance. The correct option is B.
What is chemical property?A chemical property is any property of a material that emerges during or after a chemical reaction; that is, any quality that can only be established by changing a substance's chemical identity.
A chemical property is a property of a specific substance that can be observed during a chemical reaction.
Some of the most important chemical properties are flammability, toxicity, heat of combustion, pH value, radioactive decay rate, and chemical stability.
The chemical properties of matter describe how matter changes its identity to form a new substance.
The property of a substance that can be observed or measured when the substance undergoes a chemical change is referred to as its chemical property. A chemical reaction can be used to observe chemical properties.
Thus, the correct option is B.
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4.
A boat is travelling at a steady speed in a straight line across the surface of a
lake. Which statement about the boat is correct?
A The resultant force on the boat is in the direction of motion.
The resultant force on the boat is in the opposite direction to its motion.
C
The resultant force on the boat is vertically downwards.
D The resultant force on the boat is zero
Answers
Answer:
D The resultant force on the boat is zero
Explanation:
What two gases in the atmosphere do animals and plants need to breathe and grow?
Answers
Answer: Explanation:
Plants and animals each produce the gases that the other needs to live. Plants need carbon dioxide—people and other animals exhale carbon dioxide as a waste product. People and other animals need oxygen—plants produce oxygen during an important process called photosynthesis, which turns the sun's energy into nutrients.
Plate Tectonics Lab Report The outcome variable (dependent variable): the outcome/dependant variable is Test variable (independent variable): the test/independent variable is
please only answer if you have done the paper before
Answers
Answer:
sorry if this isnt 100% correct, but i feel like it should be understandably correct
Test variable (independent variable): the land of the 6 locations
Outcome variable (dependent variable): the location
Explanation:
why is it important to keep prices low
Answers
What type of machine is a rake?
A).simple machine
B).complex machine
C).mechanical machine
D).compound machine
Answers
Answer:
A) simple machine
Explanation:
cuase a rake is simple????
why do you suppose the stomach contains acid? what do you think happens when there is more acid than food in the stomach?
PLZ help I need an answer ASAP
50 points to the first person!!!!!
Answers
Answer:
Your stomach acid helps you break down and digest your food. Sometimes, a higher than normal amount of stomach acid can be produced. This can lead to symptoms like abdominal pain, nausea, bloating, and heartburn.
Explanation:
brainliest plz
Answer:Stomach acid, or gastric acid, is a watery, colorless fluid that’s produced by your stomach’s lining.It’s highly acidic and helps break down food for easier digestion. This helps your body absorb nutrients more easily as food moves through your digestive tract.In order to break down everything from meat to tough, fibrous plants, stomach acid has to be highly acidic.Your body is designed to handle normal levels of stomach acid so it doesn’t cause you any illness or health complications.
Explanation:Stomach acid encounters a lot of things on behalf of your body. It breaks down the foods you eat into easier-to-digest particles. It also acts as the first line of defense against pathogens and microbes that could make you sick.
hope this helps I tried my best
Select the statement(s) that accurately characterize sound and light waves
sound and light wave are a repeating disturbance
Both sound and light waves need a medium to travel.
Sound and light travel in waves.
Sound and light waves carry energy.
Sound and light waves carry matter.
Answers
Answer:
All but number 5
Explanation:
A wave is a repeating disturbance or movement that transfers energy through matter or space, sound cannot travel through a vacuum and neither can light. light and sound travel in waves which is what makes them a repeating disturbance
All of the above except for 5
Explanation:
What unit do you measure time in to determine the speed of an object?
Celsius
Grams
Kilometers
Seconds
Answers
Answer:
Seconds
Explanation:
Seconds are used most in physics, biology and chemistry to either determine the speed of ano object or in this case for biology and chemistry used to measure rate of reaction
True or False
If two unbalanced forces act on an object in opposite directions, the object will move in the direction that the stronger force is acting.
Answers
Answer:
true
Explanation:
If two unbalanced forces act on an object in opposite directions, the object will move in the direction that the stronger force is acting. If two forces act in the same direction on an object, the forces add together and the object experiences a greater force in that direction
An object in the opposite direction will act on the strongest force
How do we know there has not been an increase in the number of earthquakes? Officials from the U.S. Geological Survey, the government agency that keeps track of earthquakes, point to statistics. On average, there have been no more earthquakes so far in 2010 than there were in previous years.
What Happens During Earthquakes?
In reality, it's not the number of quakes that has gained our attention, but the devastating impact quakes can have. Earthquakes are very natural—it's inevitable that they'll happen because of the way the planet works. The earth's surface is made up of tectonic plates that fit together like puzzle pieces and are always moving past each other. When two of the plates' edges get caught, stress builds up at the fault line—the crack between the plates. When the plates are finally able to break free of each other, the stress is released, and an earthquake occurs. Earthquakes of varying strengths happen every day, usually at fault lines. Some of these quakes have a high magnitude, while others are relatively weak. But it's often where an earthquake takes place that determines whether it will be something that goes largely unnoticed, or a disaster that affects thousands of people.
What Is Changing?
In the past, earthquakes were not as much of a problem because Earth's population was smaller, and cities were less populated.
"Look at some of the big [earthquakes] recently," said Debarati Guha-Sapir of the World Health Organization. Guha-Sapir cited some earthquakes that took place in areas where the population had increased in recent years, making the quakes more serious. "Had the Izmit or Bhuj quakes [of 1999 and 2001] happened 30 years ago, the events would have been relatively insignificant, as the [populations] of these cities were a third of what [they were when the earthquakes happened]. Increasing population density makes a small event into a big one."
Some of the earthquakes that took place in early 2010 occurred in highly populated areas, as well. More people are moving into megacities that happen to be built on fault lines—and many cities are on fault lines. Of the 130 cities with more than one million people, more than half are in earthquake zones, making them more prone to earthquakes.
In many of these cities, officials have drawn up laws requiring that buildings be designed and constructed to endure earthquakes. But some cities, particularly those in developing countries, lack the resources to do this. There, people are rapidly putting up substandard buildings that can't withstand the force of the shaking earth. For example, the Haiti earthquake took place near the nation's crowded capital. There was a great deal of destruction because there were "too many people crammed into a city that wasn't meant to have that many people and have an earthquake," said University of Miami geologist Tim Dixon.
Another reason quakes seem worse is that we're paying more attention. Everyone noticed when the Haiti earthquake was quickly followed by the Chile earthquake. Many people watched the news and the Internet for updates on these disasters, unable to believe that they were seeing two major earthquakes in such a short period of time. But eventually, the earth will have a period when earthquakes are minor or in unpopulated areas. Then people won't notice quite so much anymore.
"People are paying attention to the violent planet we've always lived in," said Dennis Mileti, a seismic researcher. "Come back [at a time when] there have been no [noticeable] earthquakes, [and] most people will have forgotten [about them] again."
According to the article, what is one reason why it seems as if the world is experiencing more earthquakes than usual?
Answers
Answer: because there has not been one in years
Explanation: there was not on now 2023, 2022, 2021, 2020, and 2019
Answer:
The number of earthquakes has not increased because earthquakes didn't happen in the USA for a while.
Explanation:
1. Element S and i have the same of valence electron
2. element Cl and i have the same of valence electron
3.element Cu and i have the same number of energy level
4. Element He and i have similar chemical properties
5. Element Na and i have similar chemical properties
Answers
Answer:
Explanation:
asd
help me pls i need the answer
Answers
What is the kinetic energy of a 24-kg mass that is moving with a velocity of 2 m/s?
Answers
Answer:
1/2mv^2
1/2*24*2^2
answer=48
Answer:
48 J
Explanation:
Kinetic energy can be found using the following formula:
\(KE=\frac{1}{2}mv^2\)
where m is the mass in kilograms and v is the velocity in m/s.
We know the mass is 24 kilograms and the velocity is 2 m/s Therefore, substitute 24 in for m and 2 in for v.
\(KE=\frac{1}{2}*24*2^2\)
Evaluate the exponent first. 2^2 is the same as multiply 2, 2 times.
2^2=2*2=4
\(KE=\frac{1}{2}*24*4\)
Multiply 24 and 4
\(KE=\frac{1}{2} *96\)
Multiply 96 and 1/2, or divide 96 by 2.
\(KE=48\)
Add appropriate units. Kinetic energy uses Joules, or J
\(KE=48 Joules\)
The kinetic energy is 48 Joules
M
An object has a mass of 5.52 g and a volume of 12 mL. What is the density of the object
Answers
Answer:
0.46 g/mL
Explanation:
Density can be found using the following formula.
\(d=\frac{m}{v}\)
where d is density, m is mass, and v is volume.
We know that the object has a mass of 5.52 grams and a volume of 12 milliliters.
m=5.52 g
v=12 mL
Substitute these values into the formula.
\(d=\frac{5.52 g}{12 mL}\)
Divide 5.52 by 12
5.52/12=0.46
d=0.46 g/mL
The density of the object is 0.46 g/mL, and option C is correct.
Please someone help with all of these 3
Answers
Answer: Because they all share the same square root
Explanation:
h = 6.63 × 10−34 J.s = 4.136 × 10-15 eV.s
Answer:
A=12 B=36 C=1 D=36
Explanation:
How has the car affected the way people live? Give three ways
Answers
2. The automobiles (cars) gave people access to jobs, places to live, and services.
3. Being able to travel from one to place to another in just a matter of minutes.
2. companies, like Amazon can deliver packages by car.
3. You can easily listen to music or de stress while in the car.
that 3rd is bad but the other two are good. :)
List an example of matter in each of the three states.
Answers
The example of matter in the three states is brick in solid state, water in liquid state and oxygen gas in gaseous state.
1. Solid: A brick is a solid object that maintains a fixed shape and volume.
2. Liquid: A glass of water is a liquid that conforms to the shape of its container but maintains a definite volume.
3. Gas: Oxygen gas in the atmosphere is a gas that does not have a fixed shape or volume, filling the available space.
The three states of matter are solid, liquid, and gas. Solids have a fixed shape and volume, such as an ice cube. Liquids have a definite volume but take the shape of their container, like water. Gases have neither a fixed shape nor volume and fill the entire space available to them, such as the air we breathe.
In summary, the states of matter describe the physical properties of substances based on the arrangement and movement of their particles, with solids having a fixed shape, liquids taking the shape of their container, and gases being free-flowing and filling all available space.
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Solid: An object that keeps a constant shape and volume is a brick.
Thus, Liquid: A glass of water is a liquid that keeps a consistent volume while taking on the shape of its container. Gas: Oxygen gas fills the available space in the atmosphere and does not have a defined shape or volume.
Gas, liquid, and solid matter can exist in any combination. Solids, like an ice cube, have a set shape and volume.
Like water, liquids have a set capacity but adopt the shape of their container. Gases, like the air we breathe, have neither a set shape nor volume and fill all available space.
Thus, Solid: An object that keeps a constant shape and volume is a brick.
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PLZ HELP DUE TODAY ! ! ! ! A student built the following circuit from a diagram. What can the student do to make this a complete scientific investigation?
The student can complete the same experiment outside.
The student can try completing the experiment in the dark.
The student can use completely new materials and do a different experiment.
The student can change the size of the battery and see what happens.
Answers
Which effect is created when two sound waves that are close in pitch
interact?
O A. Echoes
O B. Loudness
C. Beats
O D. Intensity
Answers
Answer:
C. Beats
Explanation:
When waves are interfering with each other, the sound is louder in some places and softer in others. As a result, we hear pulses or beats in the sound.
Answer:
beats
Explanation:
got it right
It was in 1880 that the sport really began to take shape, thanks almost exclusively to one person. ________________was a student at Yale from and an avid athlete, playing on Yale's football team until 1882. Even after he left Yale as a student, he continued to coach the team and be a regular presence at every rules convention held until his death.
a
Tom Brady
b
Irving Reid
c
Walter Camp
d
Mitty Scott
Answers
(lol it needs to be longer or it won’t send)
Explain what happens as the heart grows bigger.
Answers
Initially, the heart may grow bigger as a compensatory mechanism to try to keep up with increased demands for blood and oxygen. For example, if a person engages in regular exercise, their heart may enlarge to accommodate the increased demand for blood and oxygen to the muscles.
However, if the heart continues to grow over time, it can become less efficient at pumping blood and may develop structural abnormalities that increase the risk of heart failure, arrhythmias, and other complications.
In some cases, cardiac hypertrophy may be reversible if the underlying cause is treated, such as by managing high blood pressure or heart disease. However, if left untreated, hypertrophy can lead to irreversible damage to the heart muscle and may require more aggressive interventions, such as medication, surgery, or other medical procedures to manage the condition.
PLEASE help with this!!! i'll give brainliest if right!!
Answers
2: decreases, increases, increases, stays the same
3: increases, decreases, decreases, stays the same
4: increases, decreases, decreases, stays the same
A __ is the starting point from which you describe an objects velocity
Answers
Answer: Reference point
Explanation: A reference point is a starting point
Explanation: The reference point is the starting position.
Which graph below best shows how the speed of the molecules in ice cream change as it melts? _____________
Answers
Answer:
1
Explanation:
Because as the temperature increases so does the speed of the molecules because in a solid the molecules are packed very tight and close together allowing for little movement in a liquid the molecules are packed as close
To each other allowing for more movement meaning in a liquid the molecules move faster than a solid
Answer: it’s number 2
Explanation:
PLEASE HELP!! DUE SOON!!!
Describe examples of the normal range of motion for two different joints (choose from knee, elbow, shoulder, and hip).
Answers
Answer:
See attached file :)
Hope this helps!
All the love, Ya boi Fraser :)
Answer:
Each joint has different ranges of motion for each type of movement it can ... and bones move the joint into a straightened position, like straightening the elbow
If someone lifts less weight than you, explain why that person could be considered more powerful.
Answers
Answer:
there faster
Explanation:
stronger,wiser,better,THEY ARE BETTTEEEEEEEERRRRRRRR
Answer:
they're so strong that they don't need to lift heavy weights anymore because they're experts (slay lol). so they just have a simple daily workout.
How can you make a sound louder?
adding more frequency
removing energy
removing frequency
adding more energy
Answers
Answer:
BY adding more energy
Explanation:
Because by adding energy it will cause the string/sound to vibrate more which can cause more air particles to more and longer making the sound louder.