Answer:
New substances are produced by a chemical change
define not matter and give examples
Answer:
Everything that has mass and takes up space is matter. Every day, you encounter phenomena that either don't have mass or don't take up space. They are non-matter. Basically, any type of energy or any abstract concept is an example of something that is not matter.
An apple.
A person.
A table.
Air.
Water.
A computer.
Paper.
Iron.
hope this helped you
Is wood a colloid or suspension ?
The gas formed when coal is heated in the absence of air_____________
Which can lead scientists to change a theory that has already been accepted? Check all that apply. changes to scientific laws new experimental methods new hypotheses technological inventions repetitions of old experiments
Answer:
New experimental methods
Technological inventions
Explanation:
A scientific theory is usually not based on speculation. Scientific theories must have a solid empirical basis.
However, experimental methods are limited to the caliber of equipments available at the time in which a theory is formulated. With advancing years, more technological sophistication leads to the invention of new instruments and ultimately, the development of new experimental methods.
These innovations are likely to alter existing scientific theories as new evidences emerge, hence the answer.
new experimental methods
new hypotheses
technological inventions
Potassium atomic number a) 27 b) 67 c) 19
Answer:
C
Explanation:
19 is the answer, because it is the atomic number of potassium. Hope it helps!
PREDICT What properties do you think a spoon must have for it to be useful as an eating
list down two applications of isotopes
Answer:
Give any two application for isotopes
Isotopes of iodine are used for radiotherapy in treatment of hyperthyroidism, cancer, etc.
Uranium, Radium, Polonium isotopes are used in atomic reactors.
Cobalt isotopes are used for irradiation of food products.
✅1) Isotopes of iodine are used for radiotherapy in treatment of hyperthyroidism, cancer, etc.
✅2) Uranium, Radium, Polonium isotopes are used in atomic reactors.
IamSugarBee
1. Explain what is in a buffer. Discuss the function of a buffer. How will pH change when small amounts of acids or bases are added to the buffer solution? 2. Cooks use baking soda to make cakes light and fluffy. You might have used baking soda yourself. Baking soda is NaHCO3. A 0.1 M solution of baking soda in water has a [H+] of about 4.0 × 10–9. (You may prefer to think of the hydronium ion concentration, [H3O+], as 4.0 × 10–9.) Write the formula for the calculation of pH, and then show each step as you calculate the pH of a 0.1 M solution of baking soda. 3. Before tackling this problem, be sure you know how to find the antilog of a number using a scientific calculator. A solution has a pH of 5.4. Write the formula you will use to calculate the [H+] and then show all your work leading to the determination of [H+].
Answer:
(1) See below, (2) About 8.4 pH, (3) About 3.981 * 10⁻⁶ mol dm⁻³
Explanation:
1. A buffer is a solution that resist pH when adding a basic or acidic compound. It's purpose is to neutralize added acids and bases.
2. Remember that the formula for pH is -log [H+]. We have a 0.1 M solution of baking soda in water with [H+] of about 4.0 × 10⁻⁹. Therefore we can calculate the pH as follows...
pH = -log (4.0 × 10⁻⁹)
pH = -(-8.39794...) = (About) 8.4 pH of 0.1 M of baking soda
3. This question has a similar set up...
pH = -log [H+]
[H+] = inverse of log^- pH
[H+] = 10^-5.4 = (About) 3.981 [tex]*[/tex] 10⁻⁶
What physical properties help us identify and classify materials?
Answer:
Physical properties is that is value a state of the describes that physical system.
Explanation:
Physical property is that perform physical system can be used to the momentary and to referred the physical quantity.
Physical property is to contain that they are not model property and often to the extensive and intensive property they are process not combined.Physical property is to produced to the intensive property is not depend on size and the system or extensive property is to the show all the relationship.Physical property is to the direction and property to the spatial observations.Physical property is the interception to the reflective property to the surface of the light and its called secondary.Physical property is to the similar way in the atomic structure, property to the underline the atomic structure to the quantum structure.Physical property is to contain the object to used to the classical mechanics, to the optical and electrical property.Physical property is the many way to produced :- area, color, density, distribution, electric change, hardness , length, opacity, and strength.in what way do scientists help the government do its work
Answer:
Inventing gadgets to make their work easier.
Protecting the country using bombs and guns.
Explanation:
Describe the test for iodide ions
Answer:
The test solution is acidified using a few drops of dilute nitric acid, and then a few drops of silver nitrate solution are added. Different coloured silver halide precipitates form, depending on the halide ions present: ... iodide ions give a yellow precipitate of silver iodide.
What is the mass of an rock that has a density of 3.52 g/cc. and when put in a graduated cylinder with 50ml of water makes the level rise to 62ml.
Answer:
m = 42.24 grams
Explanation:
Given that,
The density of the mass of a rock is 3.52 g/cm³.
Initial volume of the graduated cylinder is 50 mL and when rock is put in it the water level makes the level rise to 62 mL.
We need to find the mass of the rock.
Volume of rock = final volume - initial volume
Volume of rock = 62 mL - 50 mL
Volume of rock = 12 mL
1 ml = 1 cm³
So, 12 mL = 12 cm³
Density=mass/volume
[tex]m=d\times V\\\\m=3.52\ g/cm^3\times 12\ cm^3\\\\m=42.24\ g[/tex]
So, the mass of the rock is 42.24 grams.
The mass of the rock is 42.24 g
We'll begin by calculating the the volume of the rock.
Volume of water = 50 mL Volume of water + rock = 62 mL Volume of rock =?Volume of rock = (Volume of water + rock) – (Volume of water)
Volume of rock = 62 – 50
Volume of rock = 12 mL
Finally, we shall determine the mass of the rock.
Volume of rock = 12 mLDensity of rock = 3.52 g/cm³ = 3.52 g/mLMass of rock =?
Mass = Density × Volume
Mass of rock = 3.52 × 12
Mass of rock = 42.24 g
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In an electrochemical cell, electrons travel in which direction? * (a) from the anode to the cathode through the external circuit (b) from the anode to the cathode through the porous cup (c) from the cathode to the anode through the external circuit (d) from the cathode to the anode through the porous cup.
Answer:
(a) from the anode to the cathode through the external circuit
Explanation:
In an electrochemical cell, there are two half cells; the oxidation half cell and reduction half cell. Oxidation typically refers to loss of electrons and reduction refers to gain of electrons.
Electrons always flow from the anode to the cathode or from the oxidation half cell to the reduction half cell.
The electrical circuit in an electrochemical cell confirms the flow of electron. Usually a light bulb is attached. The correct option is;
(a) from the anode to the cathode through the external circuit
In an electrochemical cell, the direction which electrons travel is: (a) from the anode to the cathode through the external circuit.
Electrons can be defined as the subatomic particles of a chemical element that are negatively charged and have a magnitude of -1.
An electrochemical cell refers to a device that is capable of either generating electric current from the electrical energy released by a spontaneous redox reaction or using an electrical energy to cause chemical reactions.
Generally, an electrochemical cell is also referred to as a secondary cell and a good example is a rechargeable battery.
In Science, the direction of flow of current is usually from the anode (positive side) to the cathode (negative side) in an electrical circuit.
On a related, current is made up of electrons and as such the direction which electrons travel is usually from the anode to the cathode through the external electrical circuit.
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Students are conducting an experiment to determine if sugars are present in foods. They heat a test tube containing a sugar solution in a beaker of water. Which of these is an UNSAFE laboratory practice in this experiment?
a. heating the sugar solution in a closed test tube
b. rinsing hands with water after handling the materials
c. using a test tube clamp to hold the test tube
d. wearing safety goggles while heating the sugar solution
Answer:
A
Explanation:
Benedict's test is the ideal standard test to distinguished between reducing(glucose) and Non reducing(diasaccharides,sucrose).
Benedict's tests gives a positive test for the presence of reducing sugar,with the initial mixture of the sugar solution changing from the initials green and orange color and brick red precipate of copper (ii) ,which would not dissolve in solution.
However, with non reducing the Benedict's gives a negative test.Because no color change occurs.
In either case,the chemical reaction that occurs as the solution gained heat is exothermic and this may lead to boiling of the solution and spilling onto the burner,which may lead to explosion.
What’s 73m equal to in dm
Answer:730
Explanation:
how many significant figures are in this number? 22.0 grams
Answer:
Hey there!
22.0 has three significant figures.
Let me know if this helps :)
PLZ HELP ME 20 POINTS AND BRAINLEIST What do you suppose would happen if you placed an ice cube in a beater containing pure ethanol (density = 0.789 g(mL) wounldn it sink or float?
Explanation: The Ice Would Sink Toward the Bottom
Density of Ice at 0 Celsius is 0.92 grams per milliliter. Therefore the Ice has a greater density than ethanol, and the ice cube should sink toward the bottom
26,000 nanoliters = ? dekaliters
Show Calculation steps
Answer:
0.00026
Explanation:
it is in the picture
Katherine was given a tiny lamb by her uncle. The lamb was a runt and had to be fed by hand. Every 3 hours
Katherine had to give it 290 milliliters of milk. How much milk, in LITERS, will the lamb get in 24 hours?
Answer:
2.32 liters
Explanation:
you would just divide 24 by 3 which is 8 and multiply 290 by it which is 2320 and divide by 1000 which is 2.32
The quantity of milk that will the lamb give in 24 hours is 2.32 Liter.
What is a Lamb?Lamb may be defined as the youngest form of sheep. In other words, it may be characterized as the little offspring produced by a sheep.
According to the question,
The amount of milk given by lamb in three hours = 290 milliliters.
∴ The amount of milk given by lamb in one hour = 96.66 milliliters.
Now, the amount of milk given by a lamb in 24 hours = 24 × 96.66 = 2320 milliliters.
Now, as per the requirement of the question, convert milliliter into liter.
One liter = 1000 milliliters.
∴2320 milliliters = 2320/1000 = 2.32 liters.
Therefore, the quantity of milk that will the lamb give in 24 hours is 2.32 Liter.
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Hydrogen peroxide (H2O2, 34 g/mol) decomposes into water vapor and oxygen gas. How many liters of water vapor are produced from the decomposition of 17.0 g of H2O2 at STP?
Answer:
The volume of water vapor produced at STP is 11.60 L.
Explanation:
The decomposition reaction of H₂O₂ is:
2H₂O₂ → O₂ + 2H₂O (1)
We have:
m(H₂O₂): mass = 17.0 g
M(H₂O₂): molar mass = 34 g/mol
To find the volume of water vapor produced we need to find first the number of moles of H₂O₂ and H₂O:
[tex] n_{H_{2}O_{2}} = \frac{m}{M} = \frac{17.0 g}{34 g/mol} = 0.5 moles [/tex]
From the reaction (1) we have that 2 moles of H₂O₂ produce 2 moles of H₂O, so the number of moles of H₂O is:
[tex] 2n_{H_{2}O_{2}} = 2n_{H_{2}O} \rightarrow n_{H_{2}O} = 0.5 moles [/tex]
Now, we can find the volume of water vapor produced at STP, using Ideal gas law:
[tex] V = \frac{nRT}{P} = \frac{0.5 moles*0.085 L*atm/K*mol*273 K}{1 atm} = 11.60 L [/tex]
Therefore, the volume of water vapor produced at STP is 11.60 L.
I hope it helps you!
PLEASE MY TEACHER DIDNT TEACH ME THIS PLEASE
A. group 1.
Hope this helps.
Answer:
[tex]\Large \boxed{\mathrm{\bold{A.} \ Group \ 1}}[/tex]
Explanation:
In covalent bonding, atoms share electrons from their last shell to other atoms to gain stability.
Chlorine has 7 electrons in its last shell, it needs to gain 1 electron to become stable.
Group 1 elements have 1 electron in their last shell, they need to lose 1 electron to become stable.
Group 1 elements can bond with chlorine.
Change 6.03x107 to standard notation
Answer:
The answer is 60300000
Explanation:
The standard notation is the counterpart of the scientific notation, while the scientific notation tries to make the number smaller by using exponential numbers with base 10, the standard notation leaves them as whole numbers or decimal numbers.
Example: 5x10∧3 is written in standard notation as 5000; Where 3 tells us the amount of 0 that follows the whole number.
2.05x10∧2 is = 205 in standard notation; Where the 2 tells us the number of times the comma is moved to the right.
UMMM.....I NEED YOUR HELP GUYS....I HAVE GOT A QUESTION FOR YOU.......... Water waves slow down and their wavelength shortens when they reach shallower water.........explain why this happens???????help me out!!
Answer:
Becausee deep - water waves do not interact with the ocean bottom as they travel , their speed is independent of the water depth . But as waves enter shallow water , interaction with the bottom alters the waves . Wave speed decreases , wavelength shortens and wave height increases .
Hope this helps :)
What do you understand by long form of periodic table? Explain some of its applications?
Answer:
Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.
Answer:
Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.
How does carbon 14 differ from the typical carbon found on the periodic table?
Answer:
A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 (six protons plus six neutrons). Neutral carbon-14 contains six protons, eight neutrons, and six electrons; its mass number is 14 (six protons plus eight neutrons)
1) 513.4 m to cm
Chemistry
Nitrogen can be converted to both biological and chemical ways. Why is nitrification an important process? 1. Bacteria converts ammonia into nitrites and nitrates that plants can use. 2. Fungi convert nitrogen in dead plants into ammonium which converts proteins into ammonia. 3. Nitrogen is converted into a usable form through lightning fixation. 4. Plant enzymes reduce nitrogen compounds into amino acids.
Answer:
it is option A
Explanation: nitrification, is the process by which bacteria in the soil convert ammonia to nitrites and nitrates. Ammonia (NH3) was produced by nitrogen fixation, but plants prefer nitrites and nitrates as a source of nitrogen and oxygen.
hope it helps
What is one thing rock, air and water all have in common
Answer: all can be affected by the natural environment ( not sure answer hope it helped)
Explanation:
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, rock, air and water all are matter.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. Rock, air and water all are matter.
Therefore, rock, air and water all are matter.
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What particle inside the nucleus of an atom has a charge of +1?
Answer:
the proton
Explanation:
Inside an atom there are neutrons which have a neutral charge (no charge) and protons which have a positive charge. Outside an atom there are electrons those have a negative charge.
A cubic container is filled up with an unknown liquid whose density is 0.180 g/cm3. The side lengh of the container is 5.00cm. Whaf is the mass of this liquid??
Answer:
22.5
Explanation:
M=D*V
V=5*5*5=125
M=0.180*125= 22.5
The mass of the liquid is 22.5 g.
A cubic container has a side length (l) of 5.00 cm. We can find the volume of the cube occupied by the liquid using the following expression.
[tex]V = l^{3} =(5.00cm)^{3} =125 cm^{3}[/tex]
We have 125 cm³ of a liquid with a density of 0.180 g/cm³. The mass of the liquid is:
[tex]125 cm^{3} \times \frac{0.180g}{cm^{3} } = 22.5 g[/tex]
The mass of the liquid is 22.5 g.
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