Giving brainliest and thanks to best answer
A scientist designs some experiments to record how various substances change. She then reviewed her results. Which of the investigations listed below is an example of how the substance changed chemically?
Sodium metal reacts violently and explodes with water.
After heating aluminum in a crucible, it began melting at 1200 degrees F
Hydrochloric acid is stored inside plastic containers.
Grinding Copper sulfate allowed it to be dissolved much quicker.
Answer:
Sodium reacting with water and exploding.
Explanation:
the others are just melting, dissolving and storing a chemical. also I know its a chemical reaction because its the only answer that involves more than one chemical and has an actual change.
hope this helps :)
Describe the concentration of hydronium ions and hydroxide ions when a base is added slowly to a white vinegar solution. The pH of white vinegar is 3.1.
Answer:https://brainly.com/question/22666401
Tis question is already answered my frnd
Pls help due in 5 minutes
When does the Southern Hemisphere experience the shortest day (and longest night) of the year? Why?
Answer:
The hemisphere tilted most toward our home star sees its longest day, while the hemisphere tilted away from the sun sees its longest night. During the Northern Hemisphere's summer solstice—which always falls around June 21—the Southern Hemisphere gets its winter solstice.
Explanation:
Helppppp please and I will give you a Brainliest
Answer:
1. Interpret Laws
3. Federal? I think...
5. Appointed by the president
6. Judicial review
8. Civil
9. Judicial review
11. The constitution does not allow it
Explanation:
Answer:
1.) enforce laws
2.)State court system
5.)D
6.)C
8.)civil
9.)jurisdiction
11.)A
Explanation:
1.Which of the following is an example of a non-renewable resource?
A.Wind
B.Solar (Sun)
C.Trees
d.petroleum
2.Burning fossil fuels releases which gas into the air, making the Earth warmer?
A.Oxygen
B.Water
D.Nitrogen
D.Carbon Dioxide
Make a claim about whether or not a piece of pottery is an example of a fossil? Summarize evidence to support your claim and explain your reasoning.
Answer:
A piece of pottery is deemed NOT a fossil because fossils are the remnants of a once living thing,a piece of pottery is a historic item,a relitivitely old item.
The oldest fossils and evidence of modern humans on earth are around 200,000 years old. Before that time lived the ancestors of modern humans and Neanderthals. If all of earth’s history was compressed into 12 hours, what time would you first see modern humans?
Answer:
I would say around the 11th or 12th hour
Explanation:
seeing as the question calls for ALL of earth's history compressed into 12 hours the timeline should be similar to this: Earth was born at midnight, at around 2-3 AM land masses form, Right after that, life begins, For around 8 hours (11 PM) life is confined in water, right after that we have plants, 22 minutes later we have dinosaurs, 22 minutes later we have mammals, 5 minutes later dinosaurs are extinct, 6 minutes later we have people. So it's most likely the 12th hour. I hope this helps.
How does resource extraction affect local and national economies?
Answer:
The direct channels by which extraction can affect the economy are of particular interest. The development of mines or oil and gas fields can result in significant shocks to a regional economy, generating jobs and drawing in capital from other regions and countries.
Explanation:
What determines a single inherited trait of an indiviual ?
a. one pair of many pairs of genes
b. a disrupted cell cycle
c. one half of the replicated DNA stand
d. amino acids joined to form proteins
Answer:
The answer is A.
The pair of genes from the parent determines what trait the offspring inherits.
PLS HELP ME IT IS SUPPOSED TO BE DONE IN 10 MINS PLS In a two paragraph (it can be a 2 sentence paragraph) extended response, summarize the ways in which technological advances and enforcement of safety and environmental laws and regulations are attempting to avoid or reduce the negative effects of finding, producing, and transporting oil.
Answer:
Environment: They must be supplied and used in ways that have minimal safety and environmental stewardship have advanced safety regulations and practices, promulgated rules for reducing VOC emissions from oil and gas production and ... disposal protocols are similarly reducing negative impacts to air and water.
Explanation:
Which type of mixture looks like it's composed of different substances?
Atomic
Homogenous
Heterogeneous
Ionic
30 POINTS FOR THE BRAINLIEST
What patterns do you observe?
How are the two waves similar?
How are they different?
Answer:
they both increase then decrease
they don't have the same points
they have 2 different electric fields
Explanation:
I NEED HELP ASAPPPPPPPPPPPPPPPP
Answer:
i wold think it is C
Explanation:
Answer:
c i want brainiest
Explanation:
Which of the following occurs when there is a chemical reaction? (Mark all that apply.)
a. the reactants don't change
b. bonds between atoms break
c. atoms rearrange
d. new bonds form
e. new substances form
f. there is no product
Water freezes at 32 degrees
Group of answer choices
Fahrenheit
Celsuis
Kelvin
Answer:
Fahrenheit
Explanation:
Answer:
You should go to Cymath.com it really helped me out
What happens to salt water and fresh water when you try to mix them.
Answer:
the lighter fresh water rises up and over the salt water
Explanation:
this is because the salt water is denser
Answer:
When trying to mix fresh/salt water it leads to variable and dynamic chemical conditions, especially salinity because fresh water flowing into the estuary is less salty and less dense than water from the ocean, it often floats on top of the heavier seawater.
Explanation:
<3
Explain how you could use the solubility of a substance to make a saturated solution.
Answer:
Add solute to liquid until dissolving stops.
Evaporate a solvent from a solution until the solute begins to crystallize or precipitate.
Add seed crystals to a solution that is supersaturated.
Explanation:
What happens to salt water and fresh water when you try to mix them.
Answer:
Salt water overtakes the fresh water
Explanation:
Answer:
It all becomes salt water, unless there is enough fresh water to dissolve the salt.
Explanation: Science/Chemistry
Explain why there would be many more plants in an ecosystem than ape-x consumers. I NEED THIS PLS
Answer:
Biomass decreases with each trophic level. There is always more biomass in lower trophic levels than in higher ones. Because biomass decreases with each trophic level, there are always more autotrophs than herbivores in a healthy food web.
Explanation:
there's your answer.
Which of the following is NOT a way of making heat?
A. turning on an electric light
B. eating a sandwich
C. rubbing sticks together
D. melting an ice cube
Answer:
b. You should prolly know this tho lol
Explanation:
Explain: How does pH vary with hydronium ion and hydroxide ion concentrations in water?
Answer:
pH level varies in water for hydronium and hydroxyl ions. pH level is directly proportional to oo hydroxyl ions where as inversely proportional to the hydronium ions.
Explanation:
Answer:
pH is measured with the pH scale which is also known as universal indicator which is the colour combination of different acid base indicators it will indicate the pH level by different colour coding.
pH level varies in water for hydronium and hydroxyl ions.
pH level is directly proportional to oo hydroxyl ions where as inversely proportional to the hydronium ions.
when the concentration of hydroxyl ion increases PH value also increases but when the concentration of hydronium ion increases PH value decreases.
we can say that in this way PH value is related to hydronium and hydroxyl ions in water.
Explanation:
×!¡! Measurement !¡!×
Record the volume of the liquid in the graduated cylinder.
The volume of the liquid is ______ milliliters.
Answer:
53 trust meeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Explanation:
Define the following terms
Uniformitarianism
&
trace fossil
Answer:
Uniformitarianism- A theory that geologic process that occur today are similar to those that have occurred in the past
Trace Fossil- A fossil of a foot or trail or other travel of an animal rather than of the animal itself
Ill give brainliest and a 5 star review for the best answer Do you think your town or neighborhood has an ecosystem? If you don’t think so, explain why not. If you do think so, what are the producers, consumers, and decomposers in the ecosystem? What roles do humans play in this ecosystem?
Answer:
yes i think it is has an ecosdystem because it has life
Explanation:
What type of worm has a circulatory system?
Nematodes
Segmented worms
Roundworms
Flatworms
Your answer will be Segmented worms. Segmented worms have a closed circulatory system in which blood is enclosed in blood vessels.
What is the main function of messenger RNA?
a. it adds amino acids to a growing protein chain
b. it carries the information neccesary for protein synthesis
c. it carries the information neccesary for dna replication
d. it carries information that causes deletions and other mutations
Answer:
it carries the information neccesary for dna replication
Science question! Please read the article and give 2 new facts (not about continental drift please)! Please do this WITHOUT POSTING A LINK TO THE ANSWER (BECAUSE IF YOU DO IT WONT WORK AND YOU'LL BE MAKING ME WASTE MY POINTS TO ASK QUESTIONS!)
HURRY PLEASE
Why did the model car move away from the magnet?
the fields repelled
the fields repelled
the fields attracted
the fields attracted
the magnetic car was pushed forward from contact with the magnet
the magnetic car was pushed forward from contact with the magnet
none of the above
none of the above
Mr. Rogers wanted to study the affect of different types of music would have on students ability to complete the IA. What is his dependent variable? What Is his independent variable ?
A. classrooms
B. types of music
C. IA scores
D. students