A rock weighing 75.0g is placed in a graduated cylinder displacing the volume from 31.4 ml to 36.5ml. What is the density of the rock in grams /cubic centimeter.
Answer:
14.71 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
volume = final volume of water - initial volume of water
volume = 36.5 - 31.4 = 5.1 mL
But
1 mL = 1 cm³
5.1 mL = 5.1 cm³
From the question we have
[tex]density = \frac{75}{5.1} \\ = 14.705882..[/tex]
We have the final answer as
14.71 g/cm³Hope this helps you
Does temperature impact the ability of water to dissolve things? How do you know?
Answer:
The temperature of the water affects the amount of dissolving but it also affects the rate of diffusion.
Explanation:
Answer:
Yes, temperature can impact the ability of water to dissolve things, the solubility increases with temperature.
Explanation:
The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
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Why are enzymes required for living things to function? Reactions take place too slowly at body temperature and must be speeded up. Reactions take place too quickly at body temperature and must be slowed down. Reactions in the body require enzymes to act as reactants. Reactions in the body produce enzymes as byproducts.
Answer:
Reactions take place too slowly at body temperature and must be speeded up.
Explanation:
Reactions take place too slowly at body temperature and must be speeded up.
An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process. Enzymes are required for living things to function because they speed up chemical reactions. Enzymes are protein catalysts.
Reactions take place too slowly at body temperature and must be speeded up.
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Which of the following are characteristics of ionic compounds? Check all that apply. have high melting and boiling points are hard can exist as solids, liquids, or gases at room temperature (25°C) are good conductors of electricity when dissolved in water
Answer:
A-Have high melting and boiling points
B- Are hard
D- Are good conductors of electricity when dissolved in water
Explanation:
The characteristics of ionic compounds are: have high melting and boiling points ,are hard , good conductors of electricity when dissolved in water.
Explanation:
Properties of ionic compounds
These are the compounds have ionic bond that is complete transfer of electrons from one atom to another.They have high melting pointsThey have higher boiling pointsIn molten state they conduct electricityThey are soluble in water and conducts electricity in their aqueous state.Hard and brittle solidsSo, from this, we can conclude that from the given characteristics the characteristics of ionic compounds are: have high melting and boiling points ,are hard , good conductors of electricity when dissolved in water.
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In steel, what smaller atom fits into the empty spaces within the iron crystal lattice?
Answer:
The smaller atoms become trapped in the spaces between the atoms in the crystal matrix, called the interstices. This is referred to as an interstitial alloy. Steel is an example of an interstitial alloy, because the very small carbon atoms fit into interstices of the iron matrix.10. Which statement about cellular respiration in plants and animals is true?
Ⓐ Both plants and animals need light to start cellular respiration.
Ⓑ Both plants and animals release energy from glucose/sugar in cellular respiration.
Ⓒ Both plants and animals take in carbon dioxide in cellular respiration.
Ⓓ Both plants and animals need water in cellular respiration.
Answer:
Ⓑ Both plants and animals release energy from glucose/sugar in cellular respiration.
Both plants and animals release energy from glucose/sugar in cellular respiration is a statement about cellular respiration in plants and animals is true. Option B is correct.
What is cellular respiration?Name given cellular respiration is a process in which cells convert oxygen into carbon dioxide for respiration which is important for survival.
In cellular respiration, the metabolism of breaking down complex oxygen into energy like ATP or sugar, or glucose can occur and releases some amount of energy too.
Therefore, Option B is correct. Both plants and animals release energy from glucose/sugar in cellular respiration is a statement about cellular respiration in plants and animals is true.
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Which of the following is an indication of a chemical reaction? ( freezing, melting ,release of heat ,all of the above)
Answer:
all of the above
Explanation:
Answer: All of the above
Explanation:
When there is just one atom of an element in a molecule, how
is this atom represented in a chemical formula?
Answer:
Molecular formula, C8H16O4; empirical formula, C2H4O
Explanation:
When there is just one atom of an element in a molecule, no subscript is used in the chemical formula.
If 10 ml of orange juice has a mass of 5 g, what would the density of Orange
Juice be? (Hint: Density=massivolume)? *
Answer:
Sep by step to determine the mass of 25 mL of orange juice
Explanation:
Measure mass of container , then add 25 mL of OJ and subtract the difference
How many moles are in 170.3 grams of Carbon?
Please help show me how you do this❤️
Answer:
There are 14.2 moles of carbon in 170.3 grams of carbon
Explanation:
The mass of one mole of carbon is known as the molar mass of carbon. the unit of molar mass is grams/mole, g/mol.
The molar mass of carbon is 12 grams. This means that for every 12 grams of carbon, one has one mole of carbon.
To determine the number of moles of carbon present in 170.3 grams of carbon, the given mass of carbon, that is 170.3 grams is divided by 12.
The formula to use is: number of moles = mass of substance/molar mass of substance
Number of moles of carbon = 170.3 g / 12 g/mol = 14.2 moles
Therefore, there are 14.2 moles of carbon in 170.3 grams of carbon
Though a needle is several times as dense as water, a small needle can be made to float on the surface of water if placed carefully.
a) What could be the reason?
b) Why does a water drop assume spherical shape?
Plastics played an important role in forest conservation. Substantiate the statement.
Which describes a cell after diffusion?
A. The concentration inside the cell is greater than outside
B. The concentration is the same inside and outside the cell
C. The concentration outside the cell is greater than inside
The concentration inside the cell is greater than outside describes a cell after diffusion. Therefore, the correct option is option A among all the given options.
What is diffusion?Diffusion is regarded a passive mode of cellular transport in biology since it does not require additional energy to occur. It is the primary mode of transport for vital chemicals (such as amino acids) between cells. It is necessary for the production of energy via respiration and photosynthesis.
Some chemicals, referred to as "simple diffusion," are not controlled by the cell's own proteins. membrane. It is found in substances with low molecular weight, such as water, gasses and fat-soluble compounds. The concentration inside the cell is greater than outside describes a cell after diffusion.
Therefore, the correct option is option A.
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Humans and animals are not able to use all the energy that is obtained The extra energy is released as:
A. light
B. sound
C. heat
D. kinetic
Answer:
The C. Heat
Explanation:
It is logical, when you workout you feel hot cause your body emanates heat
is density defined as the volume in a given mass orthe mass in a given volume?
Answer:
mass in a given volume
Explanation:
Density is the mass in a given volume or mass per unit volume of a substance.
Mass is defined by the amount of matter present in a substance.
Volume is the space occupied by a body.
Density is the mass divided by the volumeMathematically;
Density = [tex]\frac{mass}{volume}[/tex]
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The answer is C
Further explanationLewis structures have a central atom and a terminal atom
The central atom is an atom that is bound to 2 or more other atoms, while a terminal atom is bound to 1 other atom
In describing Lewis's structure the steps that can be taken are:
1. Count the number of valence electrons from atoms in a molecule
2. Give each bond with a pair of electrons
3. The remaining electrons are given to the terminal atom so that an octet is reached
4. The remaining electrons that still exist in the central atom
5. If the central atom is not yet octet, free electrons are drawn to the central atom to form double bonds
Nitrogen -N : valence electron : 5 , need 3 electron for stable⇒central atom
Chlorine-Cl : valence electron : 7, need 1 electron for stable⇒terminal atom
So that N will bind 3 Cl atoms to get stability (using electrons together with covalent bonds), so that there is 1 lone pair in N atoms and 3 lone pairs from each Cl atom (a total of 10 lone pairs of electrons)
A common misconception people have is that sugar is energy and energy is sugar but you know better. Create a clear explanation that could be used to clear up this misconception.
A clear explanation of misconception of sugar is energy and energy is sugar is below.
What are sugars?Sugars are the disaccharide carbohydrate, it means they are formed by the combination of two monosaccharides.
One of the component of the sugar is glucose and we know that glucose is the source of energy in our body. So, sugars are naturally present in many food substance which in turn breaks down in the glucose and their composite constituent and releases energy. But we can never compare sugar as the main source of energy or equivalent to energy.
Hence, Energy means sugar is the misconception.
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The four level pyramid model revolves around the. Who use the system
Answer:
Explanation: The pyramid model of four level in an organization is based on and is depends on the various levels of the hierarchy systems or management in the organization. These four level is of different types of the Information System in the organization.
Explanation:
whats the difference between spring tides and neap tides
Answer:
Spring tides have higher high tides and lower low tides whereas neap tides have lower high tides and higher low tides.
Explanation:
Answer:
Spring tides have higher high tides and lower low tides whereas neap tides have lower high tides and higher low tides. Hence, the range (difference in water level between high and low tide) is much larger in a spring tide than in a low tide.
most inferences about the characteristics of Earth's mantle and core are based on
Answer:
Properties of seismic waves
Explanation:
Most of the inferences about the characteristics of earth's mantle and core are based on the properties of seismic waves.
Also, some other electromagnetic waves have been used to map the properties of the earth's interior. Seismic waves especially body waves behaves differently in certain medium. P -waves are able to pass through any material medium. S -waves can only pass through solid. They are cut off in fluid medium.In 5.49 seconds, 1.80 g of argon-35 decay to leave only 0.225 g. What is the half-life of argon-35?
Answer:
Half life = 1.83 sec
Explanation:
Given data:
Total amount of Ar-35 = 1.80 g
Amount left after 5.49 sec = 0.225 g
Half life of Ar-35 = ?
Solution:
At time zero = 1.80 g
At first half life = 1.80 g/2 = 0.9 g
At 2nd half life = 0.9 g/2 = 0.45 g
At 3rd half life = 0.45 g/2 = 0.225 g
Half life:
Half life = Time elapsed / number of half lives
Half life = 5.49 sec / 3
Half life = 1.83 sec
The ovaries in human females and the testes in human males are glands that produce hormones as part of the endocrine system. What function is the endocrine system primarily supporting through these glands and hormones?
A.
breathing
B.
obtaining food
C.
reproduction
D.
removing waste
Answer:
reproduction
Explanation:
its on study island
Which of the following is a non-contact force?
A. Magnetic force
B. Frictional force
C.Force applied by a boatman on the oars
D.Force applied by a table on a book placed on it
again I hate science
What is Zirconium-78 protons and neutrons?
Answer:
Zirconium has 40 protons and 51 neutrons
How many grams of H2SO4 do I need to use in order to produce 3.01 moles of water? consider the equation. _Ca(OH)2 + _H2SO4 = _CaSO4 + _H20
Answer:
148 g H₂SO₄
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableBalancing RxN'sUsing Dimensional AnalysisExplanation:
Step 1: Define
RxN: Ca(OH)₂ + H₂SO₄ → CaSO₄ + H₂O
Given: 3.01 moles H₂O
Step 2: Balance RxN
Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O
Need the same amount of O's and H's on both sidesStep 3: Define conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol
Step 4: Stoichiometry
[tex]3.01 \ mol \ H_2O(\frac{1 \ mol \ H_2SO_4}{2 \ mol \ H_2O} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 147.625 g H₂SO₄
Step 5: Check
We are given 3 sig figs. Follow sig fig rules.
147.625 g H₂SO₄ ≈ 148 g H₂SO₄
Why do scientists study seismographs
Answer:
to study sub terranian earth movements
Explanation:
8H earth science
Answer:
B-to determine the location of an epicenter
Explanation:
Seismologists study earthquakes by going out and looking at the damage caused by the earthquakes and by using seismographs. A seismograph is an instrument that records the shaking of the earth's surface caused by seismic waves and determine the location of an epicenter
-Source: Geo.mtu.edu
How could two objects have the same temperature but different thermal energies? One object could have more particles and greater total kinetic energy. One object could have more particles and lesser total kinetic energy. One object could have more calories. One object could have more heat.
Answer:
One object could have more particles and greater total kinetic energy
Explanation:
The higher the temperature the more the particles. So, when we have high temperature, there is more particles interacting.
Temperature can simply be defined or gotten by taking the average of of the kinetic energy of the particles in the object that is the keywords here are TAKING THE AVERAGE KINETIC ENERGY
Thermal energy is the energy that can be gotten from adding up all the total kinetic energy of the particles in the object. So, the keywords here are; ADDING UP THE TOTAL KINETIC ENERGIES.
So, when two particles of the same temperature have the different thermal energy it means that One object could have more particles and thus having greater total kinetic energy.
Plz help on question 4
Lucia is playing with magnetic toy vehicles. She has two identical toy vehicles (purple and pink) that start on opposite sides of a center magnet that cannot move. She moves both vehicles one space closer to the center magnet.
How did the potential energy of the two vehicles change? Did the potential energy of one vehicle change more than the other? Why do you think so?
Answer:
The potential energy of the two vehicles increased because they were moved against the magnatic forces. The potential energy of the pink car increased more then the potential energy of the purple car because the pink car was closer to the center magnet.
Explanation: I had this same exact question on a quiz and this was my response and I got a 100%
The effects of the movement of the cars closer to the center of the magnet are ;
A) The potential energy of the Two vehicles will be increased
B) The potential energy of one car ( pink car) will change more than purple car due to the distance between the pink car and the center magnet.
Potential energy is the energy contained in a body at rest, The increase in potential energy occur when an object continues to be at rest ( i.e. opposes movement ).
When the cars are moved closer to the center magnet the cars will oppose the motion because their movement is against the magnetic forces that exist between the center magnet and the cars ( i.e. like pole repel while unlike poles attract ). so as Lucia moves the cars closer their potential energies will continually increase ( i.e. the closer the car the higher its potential energy ).
Therefore the pink car been closer to the center magnet will experience a higher change in its potential energy than the purple car.
Hence we can conclude that The effects of the movement of the cars closer to the center of the magnet are ; The potential energy of the Two vehicles will be increased, The potential energy of one car ( pink car) will change more than purple car due to the distance between the pink car and the center magnet.
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Which elements form ions that are usually colored in solid compounds and in solution? A. alkali metals B. alkaline earth metals C. transition elements D. halogen elements
Answer:
C. transition elements
Explanation:
Transition elements are groups of metallic elements that have partially filled d orbitals. They occupy the d-block of the periodic table (Group 3-12). Examples of elements that fall under this category are Nickel (Ni), Cobalt (Co), Copper (Cu), Zinc (Zn) etc. Transition metals have outstanding properties that distinguishes them from other elements.
One of these properties is their ability to form colored compounds due to their unfilled d electron shells. They form ions that are usually colored in solid compounds and in solution.
The elements that have been colored in the solid and solution have been transition elements.Thus, option C is correct.
The periodic table has been consisted of metals, non-metals, and metalloids. The presence of valence electrons of the elements has been responsible for the chemical properties of the elements.
The transition elements have been the metals that have been consisted of electrons in the d orbitals. The presence of electrons results in the atom to excited to higher energy and have radiations in the visible region.
Thus, the aqueous and solid transition elements have been colored. Thus, option C is correct.
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