Answer:
metal and non metal-electrovalent
BRAINLIEST!!!!!! PLEASE HELP ASAP!!!!!! PLEASE ANSWER THESE!!!!! PLEASE DON'T SPAM!!!!!.
Answer:
Explanation: wht do i do??
The PC modem was invented in what year?
Answer:
1977
Explanation:
Getting connected: a history of modems. Then, in 1977, Dale Heatherington and Dennis Hayes created the world's first PC modem, the 80-103A.
HELPPPPPPPPPP:-( :-( :-( :-(
DETERMINE THE MASS NUMBER OF EACH OF THE ISOTOPES OF LITHIUM
Answer:
6u and 7u
Explanation:
no of neutrons in 1= 3
no of protons in 1=3
mass=3+3=6
same method applies to the 2nd one
How much of the protein consumed by humans around the world is fish?
O5 percent
O 20 percent
O 40 percent
O 50 percent
In an ecosystem, 20 percent of the protein consumed by humans around the world is fish.
What is an ecosystem?An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the ecosystem .Living organisms also influence the quantity of biomass which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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1. How much heat is required to heat 22 grams of Aluminum from 15 °C to 49° C
Answer:
670.956
Explanation:
You can use this equation to solve for heat :
Q = m * c * ΔT
Q represents the heat
m represents the mass in kilograms
c is the specific heat. For aluminum, it's 897
ΔT is the change in temperature, so, 49 - 15 which is 34
Plug in the numbers and you get this :
Q = 0.022 * 897 * 34
Q = 670.956 Joules
A single atom of an element has 21 neutrons, 20 electrons, and 20 protons, which elementis it?
Answer:
Calcium
Explanation:
The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.
At extremely cold temperatures, processes stop. Which Law of Thermodynamics addresses this?
Answer:
The Second Law
Explanation:
What are the states of matter in precipitation?
Thank you! Have a nice day!
There can be two, solid (Hail) and liquid (Water).
Answer:
liquid and solid
liquid- rain
solid- hail and snow
I don't know about gas; probably not.
Do electrons have psrticle nature or wave nature?
Explanation:
they have wave nature
its correct answer
How are S waves and surface waves similar?
Both arrive after P waves.
Both compress the ground.
Both travel through liquids.
Both produce minimal ground motion.
I will give out brainliest
Answer:
The answer to this question is A. Both arrive after P waves
Explanation:
Because since P waves always come first surface and S waves come after.
What is the ion #for lodine (l)?
Answer:An iodide ion is the ion I−. Compounds with iodine in formal oxidation state −1 are called iodides. This page is for the iodide ion and its salts, not organo iodine compounds. In everyday life, iodide is most commonly encountered as a component of iodized salt, which many governments mandate.
brainliest pls
I need help on either question you can answer. Thank you god bless
1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons
neutrons = mass number-atomic number
Atomic mass Cl-37= 17
Mass number Cl-37=37
Neutrons = 37-17=20
2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...
[tex]\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1[/tex]
3. The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
f = c / λ, so :
[tex]\tt E\approx f\approx \dfrac{1}{\lambda}[/tex]
Energy is directly proportional to frequency and inversely proportional to the wavelength
So, as the frequency of photon increases, the energy of photon increases
4. Based on answer number 3 :
A. The wavelength becomes longer, and the energy decreases
Which substance in this redox reaction is the oxidizing agent?
Releases energy in the form of ATP
Stores energy in glucose molecules.
Perfomed by producers
Perfomed by consumers.
Explanation:
Both (Photosynthesis and Cellular respiration)
Because
In Cellular respiration energy is released in the form of ATP and In plants glucose stored in the form of energy. Plants are producers. Animals are consumers.Therefore,
Both is correct✔
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The central atom in PbSO4 is..............???????
Answer:
The central atom is S.
Explanation:
Look at the structure.
Which two options
are
examples of chemical changes?
How many grams are in 2.190mol Mg2(SO4)3?
Mass MgSO₄ = 262.8 g
Further explanationGiven
2.190 mol MgSO₄
Required
mass
Solution
The molecular formula should be MgSO₄
So MW MgSO₄ :
= Ar Mg + Ar S + 4. Ar O
= 24 + 32 + 4. 16
= 120 g/mol
Mass MgSO₄ :
[tex]\tt mass=mol\times MW\\\\mass=2.19\times 120\\\\mass=262.8~g[/tex]
Determine the number of grams in each of the quantities
1.39.0 x 1024 molecules Cl2
Mass of Cl₂ : 164.01 g
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol Cl₂ :
[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.39.10^{24}}{6.02.10^{23}}\\\\n=2.31[/tex]
mass Cl₂(MW=71 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=2.31\times 71=164.01[/tex]
Answer:
hui
Explanation:
What is the formula for volume of a rectangular solid?
1.)length x width x height
2.) 1/2 length x width x height
3.)1/2 base x height
4.) length x width
Answer:
1. length x width x height
Answer:
1st.
thats the one for u to choose
Which two options are examples of chemical changes? A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
Answer: B. When two clear, colorless liquids are mixed together, a white solid forms.
D. A white piece of paper turns black and gives off a smell when burned.
Explanation:
A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
When two clear, colorless liquids are mixed together, a white solid forms. A white piece of paper turns black and gives off a smell when burned. These two options are examples of chemical changes.
What is chemical change ?Chemical change, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
A chemical transformation is one in which one or more new compounds are created. Chemical reactions are another name for a chemical transformation. Examples include burning any stuff and iron rusting.
Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
Thus, option B and D are correct.
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Pan of water sitting outside during a hot sunny day. The temperature of the water goes up. What type of heat transfer causes the temperature to go up?
Answer: Convection
Explanation:
I hope this helps :D
Answer:
Radiation
Explanation:
It said that was the answer on the test.
A pan of water is sitting outside during a hot sunny day. The temperature of the water goes up. What type of heat transfer caused the temperature to go up?
conduction
induction
Incorrect: convection
Correct: radiation
if there are 365 grams of NaCl, how many grams of sodium are there?
Answer: Molar mass is the amount grams that one mole weighs.
Explanation: You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44
You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.
Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.
Then using stoichiometry, you can find the grams of sodium.
100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)
which equals 39.339435 g of Na.
If you need to maintain significant figures the answer will be 40.
Battery
Lightbulb
Metal
paper
clips
Wood
Motal noodle
Wire
Why does the bulb light when the needle touches a paper clip?
point
1. convection cells are produced
2. vibrations set up wavelike disturbances
ОООО
3. a circuit is completed
4. a phase change occurs
Answer:
A circut is comepleted
Explanation:
The bulb light when the needle touches a paper clip because the circuit is completed.
What is circuit?An electronic circuit comprises of individual electronic components like resistors, diodes,transistors , capacitors,etc. which are connected to each other by means of wires through which electric current flows.It can also be referred to as an electronic circuit.
It usually comprises of at least one active component . The combination of wires and simple and complex components allows operations to be performed, amplification of signals, displacement of data and performing of computations.
There are three types of circuits , an analog circuit ,a digital circuit and a mixed circuit which is combination of digital and analog circuits , even semiconductors are used in circuits.
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In an experiment, what responds to the change of the independent variable?
Answer:
Independent Variable
Explanation:
chlorine is more reactive than sulphur
Answer:
this is true
Explanation:
chlorine only needs to lose one electron to become stable and sulphur needs to lose two
Suppose you pour a glass of ice water and set it on the kitchen table. After a few minutes, the outside of the glass will be covered with drops of water. Why did this happen?
For condensation to take place there should be noticeable difference between the temperature of the system and the atmosphere. Thus condensation is the reason for clinging of water particles to the side of the glass.
What is condensation?Condensation is a process in which the vapor state converts to liquid state. Condensation is the reverse process of evaporation. Condensation occur at dew point. Dew point is the temperature at which condensation starts.
When the hot air particles collides with the surface of the glass having ice water, then the hot particles that had so much energy or kinetic energy suddenly reduces its energy and converts to water due to the change in temperature and pressure .
Thus condensation is the reason for clinging of water particles to the side of the glass having ice water.
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Which statement discribes a gas?
Answer:
There's no statement...
I was named after the man that developed the periodic table.
Einsteinium
Moscovium
Mendelevium
Lawrencium
Answer: Mendelevium
Explanation:
Can someone help me please!
Answer:
It tells you on the chart I've attached. It's all color coded. :p