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What is the outcome of all chemical changes when two substances are combined?
A- A new substance forms with identical properties
B- The two substances release an odor
C- The two substances change color
D- A new substance forms with different properties
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Chemical changes:-
occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Hope this can help.
Answer:
D- A new substance forms with different properties
Explanation:
When a chemical change occurs, it causes the matter to form into a completely new substance. Because of this, the new substance will have different properties than the original substance. Options B and C are true for some chemical changes, but not all changes. Option A is incorrect because the substance has different properties than the original substance. Thus, Option D is correct.
- I took the quiz and got 100%
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Related Questions
Please help me with 8th grade science
Answers
Answer:
the last one
Explanation:
molecule is defined as two or more atoms of the same element different element that are bound together. A molecule may be homonuclear, which means, it consists of atoms of one chemical element, as with oxygen (O2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (H2O).
A new sunscreen has been developed that is supposed to be more effective at preventing sunburn. 30 participants spray one arm with the new formula and spray the other arm with the leading formula. After 4 hours in the sun, their skin is evaluated for any redness.What is the Independent Variable?a. the 30 arms with the old formulab. the 30 arms with the new formulac. Amount of rednessd. Type of sunscreene. the 15 arms with the new formula
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Answer:
The correct answer is : b. the 30 arms with the new formula
Explanation:
Independent variable is a variable that is present in the experiment and research experimenting about and do not depend on any other variable. In this experiment the researcher is experimenting about the new sunscreen and its effect on the people.
In this experiment the 30 arms with new formula is independent variable that would change or altered the dependent variable.
Thus, the correct answer is : b. the 30 arms with the new formula
What sea is located at 17.06 Lat 64.34 Lng?
Answers
Answer:
The correct answer is - Arabian sea.
Explanation:
Longitude and latitude coordinates are the geographical position of a place present on the earth. Longitude coordinates tell the exact east west point on the earth surface while Latitude coordinates tells the exact north south location of a point on the surface of the earth.
The degree decimal in the question is 17.06 latitude and 64.34 longitude which is the position of the Arabian sea on the globe.
Thus, the correct answer is : Arabian sea.
HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEE PLZZZZ
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Explanation: pseudoscience is a collection of beliefs or practices mistakenly regarded as being based on scientific method.
What is lab safety important
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anything that possesses all of characteristics of life is called an___?
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A community that has progressed so much that it is stable and balanced
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What is the role of transfer dna
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Answer:
The transfer DNA (abbreviated T-DNA) is the transferred DNA of the tumor-inducing (Ti) plasmid of some species of bacteria such as Agrobacterium tumefaciens and Agrobacterium rhizogenes(actually an Ri plasmid). The T-DNA is transferred from bacterium into the host plant's nuclear DNA genome.
Explanation:
hope you do well
The cell theory has three main components. Which three scientists’ conclusions formed these components? A)Hooke, Schwann, and Virchow B)Hooke, Leeuwenhoek, and Schleiden C)Leeuwenhoek, Schleiden, and Schwann D)Schleiden, Schwann, and Virchow
Answers
Answer:
Hooke, Leeuwenhoek, and Schleiden.
Answer:
I believe the answer is D: Schleiden, Schwann, and Virchow
The answer is NOT B: Hooke, Leeuwenhoek, and Schleiden
Explanation:
I took the quiz and got B wrong.
Miss Brinbauer gave her students the following homework assignment: "This box contains several items. Examine the items carefully to determine their similarities and differences. Use your knowledge of rocks and minerals to place each item into one of three groups: 1) rock, 2) mineral, or 3) neither.” What skills is Miss Brinbauer asking her students to use to complete their homework assignment? Check all that apply. predicting classifying modeling analyzing interpreting
Answers
Answer:
Classifying and Analyzing.
So, B and D.
Paul Snelgrove: A census of the ocean Both in Unit 1 and in Snelgrove’s talk, emphasis is placed on the importance and massiveness of the world’s oceans. Identify some of the facts from both the unit and the video that support this claim. During his talk, Snelgrove comments that we know more about the Moon or Mars than we do about the deep-sea floor and marine habitat as a whole. Why is this surprising and even ironic? Snelgrove describes a fishing disaster that occurred where he grew up in Canada in an effort to explain how we are now experiencing “shifting baselines.” Explain what he means by this term. According to Snelgrove, if you were to suck all of the water out of the ocean, what would you be left with? Describe what Snelgrove discusses in terms of how the oceans play a part in global collaboration. Discuss the concerns Snelgrove has regarding the health and safety of our oceans and ocean life. As he concludes his talk, Snelgrove says, “And as the oceans go, so shall we.” Explain what he means by this statement.
Answers
Answer:
Snelgrove showed the value of the ocean and its wellbeing to humans. We rely on the sea, and as it fights and declines, we all start to work as well.
Explanation:
In a water molecule, the electronegativity of the oxygen atom is high where the
hydrogen is low.
Draw the directionality of the pull between the hydrogen and oxygen atoms.
O
Answers
Answer:
drawing
Explanation:
Draw:
Draw 2 water molecules, H2O. connect the Hydrogen to the Oxygen.
The human stomach secretes an enzyme known as pepsin. This enzyme breaks down proteins into smaller chemical molecules called peptides. If pepsin was mixed in a laboratory with sugar molecules like glucose, what is the MOST LIKELY result?
Question 13 options:
Pepsin will break down glucose molecules into simpler substances.
Pepsin will react with glucose only if the necessary RNA molecules are present.
Pepsin will probably NOT react with the sugar glucose since it is an enzyme that breaks down proteins.
Pepsin will probably NOT react with glucose since the activity of enzymes is limited to the human body.
Answers
Answer:
3rd
Explanation:
pepsin cannot possibly catalyze a reaction for a molecule it has not been shaped to do for.
Which two factors affect the strength of gravitational force? Distance and mass Distance and speed Speed and velocity Mass and weight
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Answer:
mass and distance the force of gravity
Answer:
The mass of the the distance, the weight and force of gravity
Explanation:
Explain the differences between acids and bases. Provide examples.
Answers
Answer:
An acid increases the concentration of H+ ions. A base is a substance that releases hydroxide (OH-) ions in aqueous solution, donates electrons and accepts protons.
Acid:Lemons, oranges, vinegar
Base:Soap, toothpaste, bleach, cleaning agents, limewater,
Explanation:
What type of molecules will create a solution when mixed with water?
Answers
Answer:
If you start to stir the liquid, the mixing process happens much faster. 2. The molecules of the solvent begin to move out of the way and they make room for the molecules of the solute. Example: The water has to make room for the sugar molecules to spread out.
Explanation:
How can you explain how genetic similarities are due to common ancestry? Where do we get our DNA from?
Answers
Answer:
Actually our genetic code is unrepeatable, the union of the female x chromosomes of our mother and chromosomes and of our father, generate a diploid cell with a UNIQUE cellular genetic code.
What shows our descent from the same ancestor is mitochondrial DNA, this DNA is the same and is repeated throughout the human race.
Explanation:
Mitochondrial DNA is circular and is found in our organelle called mitochondria, responsible for cellular respiration and formation of the energy currency ATP-
Which was Charles Darwin's contribution to the study of biology?
O He was the first person to recognize that organisms change over time.
O He believed that organisms adapted through the inheritance of acquired traits.
He explained how traits are passed from parents to offspring.
O He proposed that natural selection is the primary mechanism of evolution.
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Answer:
He proposed that natural selection is the primary mechanism of evolution.
Explanation:
Which category is the dependent variable?
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Answer:
the answer is no.2.
Explanation:
i am not sure about it
what has a greater impact on humans earth's ocean of earth's freshwater
Answers
Answer: earths ocean has more impact.
explanation:
the ocean provides a larger amount of oxygen than all the plants on earth including the amazon rainforest. freshwater isn’t as important because it doesn’t produce that much oxygen and the ocean provides more minerals and food.
All of the variables that are kept the same between the experimental
group and control group in an experiment are called
A. independent variables
B. dependent variables
C. experimental variables
D. controlled variables
Answers
Answer:
controlled :variables
An experimental design includes the independent, dependent, and controlled variables. The variables that are kept constant are called controlled variables. Thus, option D is correct.
What are controlled variables?Controlled variables are part of scientific experimentation that are kept constant and remain unchanged through the research and experiment. It is important to control some variables as they might limit and influence the other variables.
They are the same in the experimental group and control group to establish the relationship between the dependent and the independent variables. They are kept at the same rate throughout the groups. For example humidity, temperature, light, etc.
Therefore, in option D. the controlled variables are kept the same in the test and control groups.
Learn more about controlled variables, here:
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6. Which of the following types of organic compounds serve the function of
carrying genetic information? *
carbohydrates
lipids
proteins
nucleic acids
Answers
Answer:
nucleic acids
Explanation:
.......
The human genome is a diploid genome. However, when germ-line cells produce gametes, these specialized cells are haploid. What is the total number of chromosomes found in each of the gametes (egg or sperm) in your body
Answers
Answer:
23 chromosomes
Explanation:
The total number of chromosomes found in each of the gametes in the body of humans is 23.
The human genome is diploid (2n) with 46 chromosomes. The sex cells divide by meiosis - a reductional division that results in the halving of the chromosome number - during the formation of gametes. Hence, the gametes are haploid (n) with half the number of chromosomes (23) of the vegetative cells of the body.
Therefore, the eggs in females and the sperms in males each contain haploid (n=23) number of chromosomes.
Science question !!!
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Answer:
A. a decrease in air pollution
Explanation:
Because solar panels do not create any pollutants therefore it is A. a decrease in air pollution
Is the atmosphere a open or closed system?
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Answer:
The atmosphere is a closed system
Explanation:
Because inside the atmosphere open system
f(x) = x3 , then f(4) =
Answers
The answer is 64
Meat tenderizer contains an enzyme that breaks down meat quickly at room temperature. If meat is coated with tenderizer and then placed in a refrigerator, how would the enzyme be affected?
Answers
Answer:
The enzyme would be deactivated
Explanation:
If a meat coated with tenderizer is placed in a refrigerator, the cold environment of the refrigerator would deactivate the enzyme.
Enzymes are generally sensitive to temperature with high temperature capable of destroying the polypeptide bonds that hold the amino acids together thus denaturing their proteinous nature. At low temperatures, the molecules of the enzyme move less and less until the enzyme becomes deactivated.
What allowed for the Europeans to have a "Garden of Eden without humans"?
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Answer:
The supply of foods and fruit allowed Europeans to have "Garden of Eden without humans"
what is the difference between abiotic and biotic
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Answer:
Abiotic: Anything that is non-living or doesn't contain carbon. Biotic is any organism that contains carbon. Abiotic would be a rock, and Biotic would be bacteria or algae.
Answer:
The biotic factor or biotic component is the living organism that shapes an ecosystem. Abiotic factors or abiotic components of an ecosystem are the non-living physical and chemical composition of nature. Biotic factors depend on abiotic factors for their survival and growth
What are the three elements that build carbohydrates?
Answers
Answer:
carbon, hydrogen, and oxygen
Explanation: