Answer:
answer is 2
Explanation:
just did the quiz
is the transfer of heat from one object to another by direct contact. Which materials conduct heat most easily?
Answer:
Conduction is the transfer of heat between substances that are in direct contact with each other. Explanation:The better the conductor, the more rapidly heat will be transferred. Metal is a good conduction of heat. Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more.
Which of the following is not an ingredient for photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Light energy
D. Vinegar
Answer:
d
Explanation:
......................
Answer:
D. vinegar
Explanation:
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Write the chemical formulas and names for the following ionic compounds. Strontium and hydroxide
Answer:
Sr(OH)2
Explanation:
Strontium hydroxide, Sr(OH)2, is a caustic alkali composed of one strontium ion and two hydroxide ions. ... Sr(OH)2 exists in anhydrous, monohydrate, or octahydrate form.
What does it mean to optimize a solution ?
How are solutions optimize
Question
What does it mean to optimize a solution?
To find out best possible solution for a given problem within the given constraint is generally termed as optimization
How are solution optimize ?
To solve an optimization problem, begin by drawing a picture and introducing variables. Find an equation relating the variables. Find a function of one variable to describe the quantity that is to be minimized or maximized. Look for critical points to locate local extrema.
what is meant by the term symbol of an element?
An element symbol is a one- or two-letter abbreviation for a chemical element name. When a symbol consists of two letters, the first letter is always capitalized, while the second letter is lowercase. Element symbols also can refer to alchemy symbols for the elements or to the symbols used to describe isotopes.
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Consider the substances quartz (SiOs), gold (Au), and nitrogen gas (N2). If possible, use the terms
molecule and compound to describe each substance. If one or more of the substances cannot be
described by the terms molecule and compound, explain why not.
Answer:
Silicon Dioxide is a compound usually referred to as Quartz, it's a crystalline sort of material that is commonly found and used for equipment and furniture (like tables for example). Their molecular geometry is of tetrahedral shape (how their bonds look like and such)
Gold is an element that is a transitional metal that is quite malleable (able to hammer it to sheets) and is ductile (can be made into wires). As you probably have guessed, gold is used a lot for jewelry due to its lustrous appearance, and the fact that it can't corrode as well as its rarity. Due to it not being able to corrode, it's pretty useful in circuitry as it requires less management unlike elements with higher electrical conductivity like copper or silver. However gold is pretty costly so it's not often relied on for technology and mostly just used for show instead.
N2 or nitrogen gas, may seem like a compound for people new to chemistry but is actually just a diatomic molecule, meaning they are composed of only 2 atoms. So elements that are diatomic are commonly found with only 2 atoms (Oxygen gas for example, or Hydrogen gas) Nitrogen is part of the "magnificent seven" (the elements which are diatomic". Nitrogen is essential for a lot of living things (aside from us), and since they are the most abundant material in our air (78% of air is Nitrogen), there's plenty of life growing.
Compound and elements are differ from each other. Silicon dioxide ( SiO₂ ) is compound , gold ( Au ) is element and nitrogen gas ( N₂ ) is compound.
What is difference between molecule and elements ?Elements are always made-up of only one type of atom. Molecule is made up of more than one type of atom. Silicon dioxide is a compound, which is crystalline in nature. Their molecular geometry is of tetrahedral shape.
Gold is an element that is a transitional metal that is quite malleable and is ductile. Gold ( Au ) is used a lot for jewelry. Nitrogen gas is compound . It is diatomic in nature, So elements that are diatomic are commonly found with only 2 atoms.
Hence, silicon dioxide is compound, gold is element, and nitrogen gas is also compound.
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the idea of arranging the elements in the periodic table
Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
Select all the statements that correctly describe a solution. Multiple select question.
A. A solution is a mixture of substances dissolved in water.
B. A solution may have more than one solute.
C. Not all solutions are liquid.
D. A solution is a homogeneous mixture of two or more substances.
E. The solute is the substance present in the largest quantity.
Answer:
B, D, C
Explanation:
the solution may have more than one solute, a solution is a homogenous mixture of 2 or more substances and not all solutions are liquid
A solution is formed by the mixture of substances dissolved in water. There may have more than one solute. Not all solutions are liquid but there exists solid solutions too. Hence, options A, B, C are correct.
What are solutions?A solution is a combination of a solvent and a solid solute. The solute can be completely dissolved in the solvent and can have a partial solubility.
Water is a good solvent which dissolve majority of compounds. But there are other solvents too forming solution with suitable solutes. Solutions can be homogenous or heterogenous. Homogenous solutions are forming one phase and the solute particles are uniformly arranged.
Heterogeneous solutions are those where the solute particles are arranged in a non-uniformity and they form a different phase from the solvent.
There can be more than one solute in a solution provided that the solute can be of miscibility with each other.
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This chemical equation is balanced.
F2 + 2NaBr
2NaF + Br2
How does the balanced chemical equation show the conservation of matter
in this chemical reaction?
A. There are fewer Na atoms in the reactants than in the products.
B. The number of Fatoms in the reactants equals the number of F
atoms in the products.
C. The compound NaF is a substance that is different from the
compound NaBr.
D. There are more Br atoms in the reactants than in the products.
Which of the compounds in the table below is listed in the wrong colum?
Answer: C
Explanation: This is because of a nice thing called guessing
1. Explain the difference between genetic, environmental, social, and pathogenic factors.
2. How do pathogens spread?
3. How can we, as humans, prevent transmission of pathogens?
4. List three ways the environment can affect personal health.
Answer:They can be spread through skin contact, bodily fluids, airborne particles, contact with feces, and touching a surface touched by an infected person.
Immunise against infectious diseases.
Wash and dry your hands regularly and well.
Stay at home if you are sick.
Cover coughs and sneezes.
Clean surfaces regularly.
Ventilate your home.
Prepare food safely.
Practise safe sex.
Explanation:
Help answer these chemistry questions
Answer:
45th answer is pure and properties 42 is periodictable
How can you find each of the 4 blood vessels when dissecting?
Answer:
that's a weird question
Explanation:
why do you need to know that?
Two samples of carbon come into contact. A heat transfer will occur between sample A and sample B. What must be true for heat to transfer from sample A to sample B
Help. 50 points. Need honest answers.
Answer:
ok
Explanation:
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How many grams are in 4.1 mole sample of CO?
Did the flower used in this investigation come from a plant that reproduces sexually or asexually? Explain your answer. (If u don’t know the answer don’t answer.) (No picture) (I didn’t know what category)
Answer:
Asexually
Explanation:
Plant's cannot reproduce sexually
Both graphite and pure metals are both soft. explain why
Answer:
In a pure metal, the force needed to make the layers slide over each other is small. This explains why many pure metals are soft. ... The smaller or bigger atoms distort the layers of atoms in the pure metal. This means that a greater force is required for the layers to slide over each other.
Explanation:
In a pure metal, the force needed to make the layers slide over each other is small. This explains why many pure metals are soft. ... The smaller or bigger atoms distort the layers of atoms in the pure metal.
Which of the following is an example of genetic engineering?
1.The sweetest honeydew melons are selected and the seeds extracted and planted for next year’s crop.
2.The strongest animals in a population survive and reproduce.
3.An exact replica of a frog is created from a body cell.
4.A gene is introduced into salmon to make them grow twice as fast.
Answer:
4. A gene is introduced into salmon to make them grow twice as fast.
Calculate the Enthalpy for the following reaction using the listed thermochemical equations:
Please help
Answer:
896.5
Explanation:
You want to manipulate each equation individually.
First Equation: Keep it how it is, because N2 is the same in the final and 1st equation
Second Equation: Multiply the enthalpy by 4 because you want the H2Os to be equal
Third Equation: Switch the sign of the enthalpy because you want toe H2O2 on the other side of the equation, and multiply by 2 to match the coefficient
Answer:
this might be of help to u
Why does all matter contain thermal
energy?
A. Because particles stop moving
B. Because all matter is hot
C. Because particles can never stop moving
D. Because all matter is cold
Answer:
The answer is C. Because particles can never stop moving
Explanation:
"All matter has thermal energy, even matter that feels cold. That's because the particles of all matter are in constant motion and have kinetic energy."
Not every earthquake has a(n) ______, but every earthquake has _____that occur in _____ the mainshock.
1.
Aftershock
Foreshock <------
2.
Aftershock <-------
Foreshock
3.
Places far away from
The Same place as <------
Am i right?
Not every earthquake has a(n) Foreshock, but every earthquake has an Aftershock that occurs in the Same place as the mainshock.
What is an earthquake?
An earthquake is defined as a natural disaster in which there are tectonic plates that are present on the earth's crust collides with each other.
An Earthquake can be minor as well as natural depending upon the frequency it causes the damage. Earthquake is the Shaking of Earth and was much destruction of the economy and manpower.
Surroundings are being disturbed like trees will fall, and buildings will collapse which will cause damage to the economy as well as to human life.
Foreshock is the before shop which happens before the earthquake and aftershock is the other socks that happen after the earthquake
Thus, the correct options are 1. Foreshock, 2. Aftershock, 3. The Same place as.
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SEP Construct Explainations: Explain how a substance's flammability can indicate a chemical change.
Answer:Wood for barbucue.
Explanation:
Who ever gets it right I will give brainly and 20 points
Answer:
LETTER C it can apply a greater output force over a greater distance compared to the input force and distance
Explanation:
i just know cause im smart like that
the name of element P
Answer:
phosphorus
Explanation:
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Find the density of an 8 gram rock if the water in a graduated cylinder rises from 25.0 mL to
29.0 mL when the rock is placed in to the graduated cylinder.
To measure the density of the stone placed in a graduated cylinder let us follow these steps bellow
Measure the volume of water poured into a graduated cylinderPlace the object in the water and remeasure the volume. The difference between the two volume measurements is the volume of the object. Divide the mass by the volume to calculate the density of the object.We know that the formula for density is given as
Given data
Mass = 8gram
Initial Volume of water in cylinder = 25mL
Final Volume of water in cylinder = 29mL
Hence the volume of the rock = 29-25 = 4mL
Therefore the density of the rock = 8/4 = 2 g/mL
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during hybridization ______.
A) nature selects which organisms will survive and reproduce.
B) the nucleus of a cell is removed.
C) two organisms with desired traits are bred.
D) a single beneficial trait is bred into a species.
Answer:
option C two organisms with desired traits are bred
calculate the molarity of a 50.0 ml of a 0.150 m hcl solution when 30.0 ml of water is added.
Answer:
0.09375 M
Explanation:
You want to use the following equation:
M1*V1=M2*V2
Then plug in the 50ml to V1 and 0.15M to M1 and 80ml to V2 (add the 50 and 30). The next thing you want to do is change the mL to liters, since Molarity is moles/liter. Once that is done, solve algebraically for answer.
** Also don't forget to capitalize the M when you mean Molarity, because it is different than m.**
Hope this helps!
New research shows that a red food colouring with an R value of 0.62 (when a particular solvent and temperature are used) could be dangerous to certain people. Samples of food colouring from two different red sweets were collected and the chromatogram bolow was produced. For each of the sweets, state and explain whether or not you would recommend that the sweets are taken off the market based on this research,
It is recommended only for the second type of candy to be taken off the market.
Based on the background information, if a candy shows a 0,62 Rf value in the chromatography it is considered potentially dangerous, and therefore it should be taken off the market.
The Rf value is calculated using the following formula:
Rf = Total distance traveled by a component/ Total distance from the pencil line to the solvent frontNow, let's find out if any of the components has an Rf equal to 0,62.
Note: To determine the distances I measured the image using a ruler and you can do the same, this will not alter the results.
Sample 1Total distance traveled by the component: 6cmTotal distance: 7 cmRf : 6 cm/ 7 cm = 0.852. Sample 2
Total distance traveled by the component: 4.34cmTotal distance: 7 cmRf : 4.34 cm/ 7 cm = 0.62This means sample 2 has the 0.62 Rf value and therefore it needs to be taken off the market.
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help me please i dont understand
Answer:
1. Dissolving powder in milk - Chemical
- It is chemical because the milk has changed on a molecular level
2. Toasting bread - Chemical
- It is chemical because adding heat to the bread cooks it, therefore
changing it on a molecular level
3. Melting cheese - Physical
- It is physical because the physical appearance was the only change
4. Slicing apples or bannanas - Physical
- It is physical because the physical appearance was the only change
5. Frying an egg - Chemical
- It is chemical because new particles were formed
6. Milk souring - Chemical
- It is chemical because it is forming a new product (lactic acid)
Explanation:
Physical Change occurs when the particles of a substance become rearranged, but do not change into different particles.
Chemical change occurs when a new substance is formed. This process is irreversable.
Answer:
give the preson above brainly bc there right
Explanation: