Answer:
Vaccines
Explanation:
You push on an object with an applied force. What is the "reaction" force to your push?
1. the object moving forward
2. the object being pulled by Earth
3. the object pushing back on you
4. the object being lifted up
Answer:
1. The object is moving forward.
Explanation:
Hydrogen and oxygen undergo a chemical reaction to form water. How much water will be created if hydrogen has a mass of 3.56 g and the oxygen has a mass of 25.32 g?
Answer:
22.88g
Explanation:
Hope this helped <3
Which of these items is a substance that is made from two or more different elements?
A. Element
B. Mixture
C. Oxygen
D. Compound
Answer:
b mixture
Explanation:
if you mix two or more things makes a mixture
HELP ME ASAP PWEASS!!!
Data Table
On the table below, record your observations before and after the interactions and explain how mass was conserved. Describe the changes in properties that prove a chemical reaction occurred. The first row is an example.
Observations Before Interaction
Observations After Interaction
How was mass conserved?
Proof of a Chemical Reaction
Example: Sugar + Heat
The sugar is in tiny white particles in a pile. Heat is not seen but is implied by the heat source. The pile of sugar in the pot has a mass of 100 grams.
There is a solid, light brown mass at the bottom of the pot. It has a mass of 100 grams.
The mass of the sugar is the same in melted form as it is in solid crystal form.
There was not a chemical reaction. Sugar did not change composition. It only melted. Melting point is a physical property, and this is a physical change.
Steel Wool + Oxygen (Fire)
Egg + Heat
Water + Heat
Zinc + Hydrogen Chloride
Sodium Hydroxide + Copper Sulfate
Answer:
Steel Wool + Oxygen (Fire) The steel wool is a grayish color and has a rough surface. Oxygen is transparent It looks like a powder, and like if it was rusted steel wool but then broken apart and turned into a powder Well Iron oxide is 7 grams and steel wool combined is 7 grams so you can say that the mass was conserved Yes, this is a chemical change because the steel wool rusted and rust is a chemical change, so iron oxide causes because if a physical change.
Egg + Heat The egg has a yellow yolk in the middle while there is some type of liquid at the border of the yolk, but it is clear, the heat is hot but transparent The egg turned into a delicious food called an omelet what was yolk staid as a liquid but got a tad harder, but the transparent border around it turned white It was conserved because the eggshell was 4 grams and the fried egg is 41 grams It is a chemical change because it results in the formation of new particles, and the chemical bonds break up and new ones are formed.
Water + Heat The water is a clear liquid, while the heat is very hot but transparent The water turned into a type of oxygen -Water Vapor- If 5 g of water becomes a gas it becomes 5 g of water vapor. The mass of the liquid water is simply transferred into the mass of the newly formed water vapor. There was no chemical reaction because the water vapor can be turned back to water also it just changed from a liquid to a gas and did not change its composition
Zinc + Hydrogen Chloride Zinc: a white/silver metallic solid. Hydrogen chloride (dilute hydroelectric acid) is a transparent, colorless liquid with a very low pH (acidic). Zinc "dissolved" in hydrogen chloride, while emitting a colorless gas. The liquid remains a colorless liquid, possibly still having a low pH from the unused acid. The colorless gas collected in a test tube gives a popping sound when ignited with a burning wooden splint, so it is not air embedded in the zinc, nor dissolved in hydroelectric acid. Well although the zinc chloride is 12 grams and not 15 the gas that was released was 3 grams and as we all know 3 + 12 is 15 so you could say that the mass was conserved The production of a new substance (most probable hydrogen) from the reaction of the two reactants. When a few drops of the liquid product are evaporated on a watch glass, a white residue is left. When a few drops of the liquid hydroelectric acid are evaporated on a watch glass, there is no residue. This proves that a new product (hydrogen gas), (white powder, zinc chloride) is produced instead of zinc being physically dissolved in hydroelectric acid.
Sodium Hydroxide + Copper Sulfate Sodium hydroxide is a turbid solution and copper sulfate is in form of bright blue crystals. When their solutions are mixed, a pale blue precipitate of basic copper hydroxide & a solution of neutral salt sodium sulfate will be formed. The sodium hydroxide and the copper sulfate combined to make a total of 67 grams and the product is split because the sodium sulfate is 47 grams and the copper hydroxide is 20 grams but altogether it is still 67 grams so you could say that the mass was conserved The proof of the reaction is the appearance of pale blue precipitates of basic copper hydroxide & a solution of neutral salt sodium sulfate.
Place the events in the order that they must occur for a fossil to be formed in sedimentary rock.
How can energy transfer affect the physical and chemical properties of matter?
A physical change is a change in the state or properties of matter without any accompanying change in the chemical identities of the substances contained in the matter. Physical changes are observed when wax melts, when sugar dissolves in coffee, and when steam condenses into liquid water. Other examples of physical changes include magnetizing and demagnetizing metals (as is done with common anti-theft security tags) and grinding solids into powders (which can sometimes yield noticeable changes in color).
The characteristics that distinguish one substance from another are called properties. A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. Some physical properties, such as density and color, may be observed without changing the physical state of the matter. Other physical properties, such as the melting temperature of iron or the freezing temperature of water, can only be observed as matter undergoes a physical change
Figure :Copper and nitric acid undergo a chemical change to form copper nitrate and brown, gaseous nitrogen dioxide. During the combustion of a match, cellulose in the match and oxygen from the air undergo a chemical change to form carbon dioxide and water vapor. Cooking red meat causes a number of chemical changes, including the oxidation of iron in myoglobin that results in the familiar red-to-brown color change.
chemical change always produces one or more types of matter that differ from the matter present before the change. The formation of rust is a chemical change because rust is a different kind of matter than the iron, oxygen, and water present before the rust formed. The explosion of nitroglycerin is a chemical change because the gases produced are very different kinds of matter from the original substance. Other examples of chemical changes include reactions that are performed in a lab (such as copper reacting with nitric acid), all forms of combustion (burning), and food being cooked, digested, or rotting. Note that the number of atoms for a given element is calculated by multiplying the coefficient of any formula containing that element by the element’s subscript in the formula. If an element appears in more than one formula on a given side of the equation, the number of atoms represented in each must be computed and then added together. For example, both product species in the example reaction, CO2 and H2O, contain the element oxygen, and so the number of oxygen atoms on the product side of the equation is
(1 CO2 molecule × 2 O atoms per CO2 molecule) + (2 H2O molecules × 1 O atom per H2O(molecule) = 4 O atoms
The equation for the reaction between methane and oxygen to yield carbon dioxide and water is confirmed to be balanced per this approach, as shown here: CH 4 + 2O2⟶CO2 + 2H2O
Element Reactants Products Balanced?
C 1×1 = 1 1×1 = 1 1 = 1, yes
H 4×1 = 4 2×2 = 4 4 = 4, yes
O 2×2 = 4 (1×2) + (2×1) = 4 4 = 4, yes
A balanced chemical equation often may be derived from a qualitative description of some chemical reaction by a fairly simple approach known as balancing by inspection. Consider as an example the decomposition of water to yield molecular hydrogen and oxygen. This process is represented qualitatively by an unbalanced chemical equation: H2O⟶H2 + O2 (unbalanced)
Comparing the number of H and O atoms on either side of this equation confirms its imbalance:
Element Reactants Products Balanced?
H 1×2 = 2 1×2 = 2 2 = 2, yes
O 1×1 = 1 1×2 = 2 1 ≠ 2, no
H2O to H2 O2 would yield balance in the number of atoms, but doing so also changes the reactant’s identity (it’s now hydrogen peroxide and not water). The O atom balance may be achieved by changing the coefficient for H2O to 2.
2H2O⟶H2 + O2 (unbalanced)
Element Reactants Products Balanced?
H 2×2 = 4 1×2 = 2 4 ≠ 2, no
O 2×1 = 2 1×2 = 2 2 = 2, yes
The H atom balance was upset by this change, but it is easily reestablished by changing the coefficient for the H2 product to 2.
2H2O⟶2H2 + O2 (balanced)
Element Reactants Products Balanced?
H 2×2 = 4 2×2 = 4 4 = 4, yes
O 2×1 = 2 1×2 = 2 2 = 2, yes
These coefficients yield equal numbers of both H and O atoms on the reactant and product sides, and the balanced equation is, therefore:
2H2O⟶2H2 + O2
Types of Chemical Reactions
Humans interact with one another in various and complex ways, and we classify these interactions according to common patterns of behavior. When two humans exchange information, we say they are communicating. When they hit each other with their fists, we say they are fighting
A photograph is shown of a yellow green opaque substance swirled through a clear, colorless liquid in a test tube.
Think about the ecosystem that you live in.
Write a response below describing it in complete sentences.
4)
Use each of these terms correctly in your description:
• community
• ecosystem
• biotic
• population
• individual
• abiotic
Answer:
this is an answer for YOU to answer. this is about YOUR ecosystem
Explanation:
just say what it's like, is it a community? is it populated? explain.
Through all the food chain, food web, chemical cycles, etc., biotic and abiotic forces interact within an ecosystem. Therefore, the functional and structural unit of nature is the ecosystem.
What is ecosystem?The functional and structural unit of nature is the ecosystem. This relationship between living and nonliving elements is handled by the ecosystem. All living things, including plants, animals, and microorganisms, rely on non-living substances to survive and keep the natural world in balance.
Individual, population and community play important role in running a ecosystem. Terrestrial Ecology: A terrestrial ecosystem is an ecosystem that is found on land. Grassland, desert, and tundra ecosystems, for instance.
Therefore, the functional and structural unit of nature is the ecosystem.
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What type of force is known for exerting an upward force on objects in a fluid?
1. buoyant force
2. friction force
3. gravitational force
4. magnetic force
The First person to answer will get the brainliest!!!!!!
Answer:
The answer is 1, Buoyant force.
Explanation:
A food scientist is determined to create a mango that looks exactly like a mango but tastes like salmon. Can this be achieved through artificial selection? Why or why not?
Answer:
depends on the artificial 'materials' used and the food scientist
Explanation:
If the food scientist is skilled enough and works hard enough this it might be possible but this does seem like a difficult task i personally doubt that this could be done until next few years. :)
I need help with this please
Answer: C, the number of atoms stay the same
Explanation:
The number of atoms remains the same before and after the reaction. This is because of the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction. In the case of methane burning, one molecule of methane (CH4) reacts with two molecules of oxygen (O2) to produce one molecule of carbon dioxide (CO2) and two molecules of water (H2O). The total number of atoms on both sides of the equation is conserved.
Oxygen in the air can react with wood when a match is burned. Ash is produced.
Which statement would be true?
A. The atoms of the ash did not exist before.
B. Ash has similar properties to oxygen.
C. The atoms of wood and oxygen disappear during the burning.
D. Ash is a different substance than wood.
Answer:
D. Ash is a different substance than wood.
Answer:
D the atoms of ash did not exist before
Explanation:
because I jnwo .... k
PLZ HELP (SCIENCE) Match the following items.
1. a reaction that releases energy
decomposition
2. a reaction that takes in energy
endothermic
3. chemical change whereby a molecule breaks down into simpler molecules or elements
exothermic
4. written underneath or below
oxidation
5. a chemical change resulting from a reaction with oxygen
subscript
Choose a property of matter and research how this property affects the way matter interacts with the world around it. Find out how the property is useful in nature or how humans make use of it.
What does this property describe?
How does the property differ between different types of matter?
Is this property used in any technology or by nature in any way?
Record your research.
NEED HELP RIGHT NOW!!!!
Answer:
Liquid foundation is a property it describes solutions, volume. weight is a property from the monocules in lighter than air. which is a natural way to simplify systematic independence. for science. Onced liquid forms a mass of ascetain size it would be used for more technology. Differences in property which are properties: oxegenation. temeratures, measurements. maybe to form independant examples.
Plz help! Write your answer in complete sentences ! Write a proper answer! 1st one to answer will get a brainliest!
Answer:
the name for CaCO3 is Calcium Carbnate, and its relations with coral reefs is that the process for making said compuond happens within coral, and is considered the building block for coral reefs.
Explanation:
hope this helps!
In a chemical reaction, which of the following is true of the products?
A. The products have the same shape as the reactants.
B. The products have the same physical properties as the reactants.
C. The products have the same state of matter as the reactants.
D. The products have the same number atoms as the reactants.
The correct statement about the chemical reaction is "the products have the same number atoms as the reactants."
What is chemical reaction?A chemical reaction occurs when one or more reactants (also known as reactants) are changed into one or more products (also known as products).
Chemical transformation occurs as a result of this process, which involves the breaking and forming of chemical bonds.
Rust is formed when iron and oxygen combines with each other.
Only the atoms present in the reactants can end up in the products of a chemical reaction. There are no new atoms formed, and no atoms destroyed.
In a chemical reaction, the reactants and products have the same atoms, but they are rearranged during the reaction. As a result, the atoms in the products end up in various combinations. As a result, the products are new chemically distinct substances from the reactants.
Hence, the correct statement is option D.
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GIVING 40 POINTS PLZ HELP!!!!!!!!
Answer:
to find heart rate put 2 fingers on your wrist or neck also what one do you need help with
Explanation:
with the development of technology why is muscle atrophy occurring more often what can you do to stop it THIS IS A SCIENCE QUESTION
Answer: Technology is causing people to sit around more while using it. Therefore people are not exercising as much. This causes the strength of muscles to go away. A way to help stop this is to get exercise for at least one hour a day.
Explanation:
In this project, you will practice calculating work and speed using the proper formula. You will also use a data table to record and analyze your data. For each question, you will complete a row in your data table to record the details, and your results. Don't forget to use proper units of measurements in all of the parts of your table!
pls help asap mark brainyist can't spell sorry
Answer:
CHECK THE IMAGE
Explanation:
PLS I REALLY NEED HELP
If the relative positions of the sun and moon affect the ocean’s tides, why would it be helpful for sailors and other people who work on the ocean to understand patterns in the Earth-sun- moon system?
Plz, help! I need help with questions a and b! Plz, write your answer in complete sentences! And the first person to answer will get a brainliest! Plz, NO SCAM links!!! Need help ASAP!!!!!
True or false? Tornadoes can form when the air in a strong thunderstorm or a supercell begins to rotate.
Answer:
true
Explanation:
tornadoes can dogs when they are in the air which then form strong thunderstorms
Answer:
it's true ..
Explanation:
they r caused by weather conditions
So im very confused!!! if you want to answer then plz read the instructions and plz give proper answer !!! Need help asap!!!!!!!!!!!!!!!!
can someone solve this question please
Answer:
I can't see the question
Explanation:
What is the name of the tide when the sun, moon, and earth are all aligned, causing the greatest pull for highest and lowest tides?
Question 10 options:
Low tide
Spring tide
High tide
Neap tide
Answer:
spring tide
Explanation:
When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides — both commonly called spring tide
Answer:
Whenever the earth, moon and sun are aligned, the gravitational pull of the moon is augmented by the gravitational pull of the sun, causing larger than average tidal ranges — meaning especially high high tides and very low low tides. These extreme tides are called “spring tides.”
Explanation:
How does the development of the heliocentric model show how scientific ideas change over time?
Answer: Italian scientist Giordano Bruno was burned at the stake for teaching, among other heretical ideas, Copernicus' heliocentric view of the Universe. In 1543, Nicolaus Copernicus detailed his radical theory of the Universe in which the Earth, along with the other planets, rotated around the Sun.
Explanation:
Italian scientist Giordano Bruno was burned at the stake for teaching, among other heretical ideas.
What is Heliocentric model?Copernicus' heliocentric view of the Universe. In 1543, Nicolaus Copernicus detailed his radical theory of the Universe in which the Earth, along with the other planets, rotated around the Sun.
Because of heliocentrism, we now understand that Earth and the other planets of the solar system all orbit the sun.
But there once was a theory that put Earth at the centre of what was thought to be the entire cosmos and that everything literally revolved around us. The sun is at the centre of the heliocentric model, which is now known as the geocentric model.
Therefore, Italian scientist Giordano Bruno was burned at the stake for teaching, among other heretical ideas.
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How are seatbelts related to inertia? Write you answer in complete sentences.
I need answer asap!!!
Answer:
Inertia- the tendency of an object to resist a change in velocity
Explanation:
Say a car was going at 65 MPH, but suddenly stopped. For all of the people in that car, their bodies would keep moving forward at 65 MPH until stopped by an equal force (say, the thing right in front of each person) The seatbelt is there to protect you from your own inertia.
If the Titan lake evaporated, how would the change in kinetic energy affect the speed of the molecules found in the lake? (highlight one)
The kinetic energy would increase. The molecules would move faster.
The kinetic energy would decrease. The molecules would move slower.
There would be no change in kinetic energy. The molecules would move at the same speed.
Answer:
a) The kinetic energy would increase. The molecules would move faster.
How does the Coriolis effect impact the Gulf Stream and the Brazil Current?
It turns the Gulf Stream southwest and the Brazil Current northeast.
It turns the Gulf Stream northwest and the Brazil Current northeast.
It turns the Gulf Stream northeast and the Brazil Current southwest.
It turns the Gulf Stream northeast and the Brazil Current northwest.
Answer:
Honestly, I think it is C.
Explanation:
Brazil is in the south, so that's why it is C.
hope this helped.
Martin slowly pours an unknown liquid into a container that originally had some water in it. He is measuring the temperature in the container as he does this.
The temperature in the container rises very fast.
What kind of change is likely to be happening in the container?
A. A physical change.
B. A chemical change.
C. Neither a chemical nor a physical change, only a temperature change.
D. No evidence of any type of change.
Answer:
B
Explanation:
temperature is a characteristic of a chemical change
The Statue of Liberty is made of copper metal. Copper metal has the physical property of being orange in color. Over years of being exposed to moist air, the surface of the statue has begun to form a green coating. Is the green coating the product of a physical or chemical change? Explain how the green layer is formed.
Answer:
The statue is made of a metal called copper. Over time, the copper has gone through a chemical change. This is called a chemical reaction.
Explanation:
i dont think this will help...
Answer:
Chemical.
Explanation:
Pretty sure its chemical, due to it oxidising which is a chemical reaction.