Answer:
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WILL GIVE BRAINLYEST and 20 points!!!!!!!
explain that atoms of elements combine to make compounds
explain why there are many, but limited, combinations of elements to make compounds
demonstrate with atomic models how atoms can combine in many ways
Answer:
Explanation:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions.
Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid. Hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances - elements.
Each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements.
The elements can be divided into three categories that have characteristic properties: metals, nonmetals, and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
Answer:
give him brainlyest my gye
Explanation:
1. Pure Substances can be broken down by physical changes.
True
False
Answer:
False
Explanation:
the diagram below represents a portion of a cell membrane. The arrow indicates that the cell membrane is carrying out the process of...
Answer:
I'm feeling nice today so heres the answer
Explanation:
In the portion of the cell membrane shown in the diagram, the arrow indicates the process of active transport.
Explanation:
Active transport is one of the mechanisms of transmembrane transport, which involves the use of energy. The diagram (see image) shows the hydrogen (H⁺) output from the cytoplasm to the extracellular space, through an H⁺ pump —consuming ATP— which represents an active transport process.
The hydrophobic nature of the cell membrane prevents the free passage of hydrosoluble elements or ions, as H⁺, so they require the use of active transport to pass through it.
The other options presented are not correct, because
Respiration is a process that occurs in the mitochondria.
Diffusion is a passive transport process that does not require energy.
Cellular recognition depends on membrane proteins that act as specific receptors.
Answer:the answer is active transport
Explanation:
Jose times how long sugar takes to dissolve in warm water. He conducts four trials of his experiment. What should he conclude from his data?
Trial Time
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.
20 points. ASAP!
So u separated Sand and salt from a mixture through evaporation and filtration. Now what is your observations and decision?
Answer:
When two or more substances, that do not react chemically, are blended together,
the result is a mixture in which each component retains its individual identity and
properties.
The separation of the components of a mixture is a problem frequently encountered
in chemistry. The basis of the separation is the fact that each component has a
different set of physical and chemical properties. The components are pure substances
which are either elements or compounds. Under the same conditions of pressure and
temperature, the properties of every sample of a pure substance are identical. Each
sample melts at the same temperature, boils at the same temperature, has the same
solubility in a given solvent, etc.
What is the best definition for the freezing point of a substance? *
It is the temperature at which a substance become cold.
It is the temperature at which a substance changes from a gas to a liquid
It is the temperature at which a substance changes from a liquid to a solid.
Answer:
It is the temperature at which a substance changes from a liquid to a solid.
Have a good day!
The temperature at which a substance changes from a liquid to a solid is called its freezing point. Hence, option d is the correct definition of freezing point.
What is freezing point?Freezing point is a physical property of a substance which measures the temperature at which its liquid state converts to solid state where, the two phases are in equilibrium.
For example, water freezes at 0 degree Celsius to form ice. Hence, 0°C is the freezing point of water. The freezing point of substance is affected by the bond type, molecular weight, temperature and pressure as well the impurities if any.
The more the intermolecular forces between the molecules, more easy to convert it into solid. Hence, the freezing point will be lower. If there is any impurities present, the freezing point depression will occurs.
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Which question should you ask to find out the length of a planet's year?
Which diagram best represents reciprocal disclosure?
Answer:I think its B
Explanation:
Answer:
B
Explanation:
it is B becuse my teacher told me it is
How much hydrogen reacts with 32 g of oxygen to produce 34 g of hydrogen peroxide. help and thxsss so much
Answer: the answer is 2g because you subtract 32-34 and get 2 and add the get so 2g
Explanation:
2 g of hydrogen reacts with 32 g of oxygen to produce 34 g of hydrogen peroxide.
To determine the amount of hydrogen that reacts with 32 g of oxygen to produce 34 g of hydrogen peroxide ([tex]H_2O_2[/tex]), we need to apply stoichiometry.
First, we find the molar masses:
Molar mass of oxygen ([tex]O_2[/tex]) = 16 g/mol
Molar mass of hydrogen peroxide ([tex]H_2O_2[/tex]) = 34 g/mol (given)
Next, we calculate the number of moles for oxygen and hydrogen peroxide:
Moles of oxygen = mass/molar mass = 32 g / 16 g/mol = 2 moles
Moles of hydrogen peroxide = mass/molar mass = 34 g / 34 g/mol = 1 mole
Since hydrogen peroxide has two hydrogen atoms, it requires twice the moles of hydrogen. Therefore, the moles of hydrogen required are also 2 moles.
Finally, we convert the moles of hydrogen to grams:
Mass of hydrogen = moles × molar mass = 2 moles × 1 g/mol = 2 g
So, 2 g of hydrogen reacts with 32 g of oxygen to produce 34 g of hydrogen peroxide
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asap first to get correct get brainleist
Answer: c)winter
HAVE A BLESSED DAY!!!!!
Thomson's plum pudding model of the atom was replaced by Rutherford's model. What was the biggest change Rutherford's model brought to our understanding of the atom? Group of answer choices
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of options. However, Rutherford's model of an atom highlighted the following (which you can use to determine your answer from the missing options)
1) electrons move in fixed circular part (now referred to as electron shells) around a central positively charged nucleus
2) The size of the nucleus is very small relative to the size of the atom
What can you make with molecules ??
Answer:
Read this passage from Through the Looking-Glass.
She looked at the Queen, who seemed to have suddenly wrapped herself up in wool. Alice rubbed her eyes, and looked again. She couldn't make out what had happened at all. Was she in a shop? And was that really—was it really a SHEEP that was sitting on the other side of the counter? Rub as she could, she could make nothing more of it: she was in a little dark shop, leaning with her elbows on the counter, and opposite to her was an old Sheep, sitting in an arm-chair knitting, and every now and then leaving off to look at her through a great pair of spectacles.
“What is it you want to buy?” the Sheep said at last, looking up for a moment from her knitting.
“I don't QUITE know yet,” Alice said, very gently. “I should like to look all round me first, if I might.”
“You may look in front of you, and on both sides, if you like,” said the Sheep: “but you can't look ALL round you—unless you've got eyes at the back of your head.”
The tone of this passage is best described as
serious and reflective.
scientific and factual.
light and romantic.
imaginative and humorous.Explanation:
Kinetic Theory: Tutorial
Activity
In this activity, open the Gas Properties simulation and follow the instructions provided with the questions below.
Part A
Using the controls along the right side of the simulation, under "Options," check the second box to select the temperature of the new particles
Then move the slider at the bottom to its lowest setting (50 K). Next, choose temperature as your constant parameter at the top. In the "Gas in
Chamber" box, add "light species" particles until about 200 are in the box. Finally, quickly add about 20 "heavy species" particles to the box.
Carefully observe how they spread across the chamber through time. What do you think causes the heavy particles to spread throughout the
chamber? What can you say about the direction of their movement?
Answer:
The heavy particles move across the chamber because of the diffusion property of gas particles. The particles move in straight lines and change directions only when they collide with other molecules or the walls of the chamber.
Explanation:
Ajay bought bottle that was labelled as distilled water. He suspected it to be tap water. What test he could use without adding any chemical in it to find out for sure?
Answer:
Ajay should pass electric current through the water and connect a bulb to the circuit. If the bulb glows, it means that the water is tap water or else, it is distilled water.
Explanation:
This is because tap water contains little impurities like ions of some salts etc., which help in the conduction of electricity. But, distilled water is pure water and doesn't have any ions present in it. So, it doesn't conduct electricity.
Hope this helped
Ajay can test the distilled water by performing the electricity conduction test.
Distilled water has been the water that has an absence of ions and electrolytes. It has been a poor conductor of electricity.
The tap water has been constituted with minerals, electrolytes, and impurities, which results in the addition of conductivity to the water.
To test whether the water has been distilled or not, the circuit test can be performed The water has dipped wires connected with a battery and a bulb. the distilled water is a poor conductor did not allow the bulb to glow. However, with tap water bulb glow.
Thus, to test the water to be distilled or tap, the electricity conduction test has been performed.
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y’all wanna explain what a water table is?
Answer:
the level below which the ground is saturated with water.
Explanation:
Pb(NO3)2(aq) + KCl(aq) ---- → KNO3(aq) + PbC12(s)
pls help me
what bond does not burn
Answer:
Iconic bonds don't burn easily
Explanation:
Covalent bonds are non metals. Covalent bond (sharing), low temp, low temp, burn easily, poor, polar covalent is good and non-polar covalent is bad.
Ionic - metals and nonmetals, ionic bond is when electrons are gained or lost, high temp, high temp, doesn't burn easily, good, good
Answer:
Explanation:
what do you mean by bond?
How many moles are contained in 5.0 g of SO2:
Hey there!
Molar mass SO₂ = 64.066 g/mol
Therefore:
1 mole SO₂ -------------------- 64.066 g
(moles SO₂ ) ??---------------- 5.0 g
( moles SO₂) = 5.0 * 1 / 64.066
(moles SO₂) = 5.0 / 64.066
moles = 0.0780 moles of SO₂
Hope this helps!
A hockey player is wearing ice skates and pushes against the wall propelling her backward on the ice. According to Newton's third law of motion, which of the following best compares the forces acting between the wall and the hockey player?
A.
The forces are equal and applied in the same direction.
B.
The forces are different sizes and applied in the opposite direction.
C.
The forces are equal and applied against gravity.
D.
The forces are equal and applied in the opposite direction.
its D
random characters AAAJIJRIAJKLGIJHEOGEINDKIKAN
What is the organism that is harmed in parasitism called? (3 points)
aCompetitor
b Host
c Parasite
d Prey
Answer:
B Host
Explanation:
this is due to the fact that the organism is hosting the parasite
I need help with my chemistry homework Here are the problems that I am struggling with. I need this to be answered by 11:59 tonight.
1. How many joules are required to melt 338. grams of ice?
2. How many joules are required to convert 418 grams of boiling water into steam?
3. How many joules are required to convert 150. grams of boiling water into steam?
4. How many joules are required to convert 42.0 grams of boiling water into steam?
5. How many joules are required to heat 422 grams of steam from 110.0 0C to 135.0 0C?
Answer:
1. 111.54 kJ
2. 944.68 kJ
3. 339 kJ
4. 94.92 kJ
5. 21.0578 kJ
Explanation:
1. The heat required to melt a given quantity of ice is known as the latent heat of fusion, [tex]L^{\circ}_F[/tex], of ice
[tex]L^{\circ}_F[/tex], of ice = 330 J/g
The heat required to melt a given mass of ice = Mass of ice, m × latent heat of fusion, [tex]L^{\circ}_F[/tex], of ice
The heat required to melt 338 grams of ice = 338 g × 330 J/g = 111,540 J = 111.54 kJ
2. The latent heat of vaporization, l, of water = 2260 J/g
The heat required to convert, m grams of water to steam at
The heat required to convert 418 grams of boiling water into steam = 418 g × 2260 J/g = 944680 J = 944.68 kJ
3. To convert 150 grams of boiling water to steam, we have;
Heat required = 150 g × 2260 J/g = 339,000 J = 339 kJ
4. To convert 42.0 grams of boiling water to steam, we have;
Heat required = 42.0 g × 2260 J/g = 94,920 J = 94.92 kJ
5. The specific heat capacity of steam is 1.996 J/(g·°C)
The heat, Q, required to raise a given mass, m, of steam by Δt °C is given as follows;
Q = m × c × Δt
The heat required to raise the temperature of 422 grams of steam from 110.0 °C to 135.0 °C is therefore;
Q = 422 g × 1.996 J/(g·°C) × (135.0 °C - 110.0 °C) = 21057.8 J
The heat required to raise the temperature of 422 grams of steam from 110.0 °C to 135.0 °C = 21057.8 J = 21.0578 kJ
When purchasing an electrical device, what are the 2 financial costs you need to consider?
Answer:
How much electricity is uses and any repairs
Explanation:
When purchasing an electrical device, the two financial costs you need to consider are the initial price of the device and the operating costs to make use of the device.
The financial cost is the cost of finance charged per item purchased, it may also include miscellaneous charges associated with the usage of the item.
Here, before you purchase the electrical device, think carefully if:
the initial price fits into your budget and;the consumption of the electricity bills(operating costs) the electrical device will consume.Learn more about financial costs here:
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The terms distance and displacement are used by scientists to describe very specific differences between an object's initial position and its final position. Describe a situation in which the distance traveled is great but the displacement is zero.
Explanation:
Distance is the total length of path one travels.
Displacement is the distance between the initial and final position.
For example, if your classroom is located 200m from your dormitory, you walk to class and back to your dormitory, your distance is 200m + 200m = 400m;
Your displacement is 0m. Your initial and final position is the same so no displacement.
The formula for table salt is NaCl. When asked to name the compound in class, you notice one of your classmates typed "sodium chlorine" in the chat. Explain why this answer is incorrect.
Answer:
It should be Sodium Chloride
Explanation:
Sodium chloride, regular table salt, is also known as the mineral halite. The diagram to the right shows how sodium and chlorine atoms pack tightly together to form cube-like units of the compound NaCl. Crystals of table salt imitate this structure-they're shaped like little cubes.
What is the average isotope mass?
Answer:
the atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope
Explanation:
Average atomic mass = f1M1 + f2M2 + … + fnMn where f is the fraction representing the natural abundance of the isotope and M is the mass number (weight) of the isotope. The average atomic mass of an element can be found on the periodic table, typically under the elemental symbol.
Answer:
he atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.
PLEASE HELP WILL GIVE BRAINLY IF UR CORRECT
Answer:
eon,era,period,epoch,and age
I need helpppppppppp
Based on the scientific sources you found, did you think one person’s points were more scientifically valid than the other’s
Answer:
Yes. The scientific sources disputed several of the fitness instructor’s points. For example, he mentioned that GMO foods cause food allergies, but two credible sources disputed this claim. The lab technician, however, supported her findings with verifiable scientific information.
Explanation: plato
Condensation is a phase change that
O has an increase in kinetic energy
O has no change in potential energy
O is exothermic
O is endothermic
Answer:
endothermic
Explanation:
condensate is an endothermic change
jumping on a cemented floor is more pain full than a sandy flour,why
Answer:
Is soft
Explanation:
because concrete is hard ash so t hink flour would be safer