Answer:
Carbon dioxide, or CO2, is a naturally occurring linear compound composed of two oxygen atoms covalently bonded to a carbon atom. The two C=O. Carbon DioxideA central carbon atom is connected to two oxygen atoms via double bonds in a linear structure.
Explanation:
help i need help WITH this
Answer:
The Internet started in the 1960s as a way for government researchers to share information. ... This eventually led to the formation of the ARPANET (Advanced Research Projects Agency Network), the network that ultimately evolved into what we now know as the Internet.
Witch element is the number 14 on the periodic table
Answer:Silicon
Explanation:
Silicon - Element information, properties and uses | Periodic Table.
Royal Society of Chemistry › 14 › si...
Silicon - Element information, properties and uses | Periodic Table
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why is the quantity of each subatomic particle important
Answer:
they determine what element it is, and what charge it will be.
Explanation:
the amount of neutrons determines the mass of the atom
the amount of protons determines the element of the atom
the amount of electrons determines the charge of the atom
How are protons, neutrons, and electrons different?
Answer:
Although similar in mass, protons are positively charged, while neutrons have no charge. Therefore, the number of neutrons in an atom contributes significantly to its mass, but not to its charge. Electrons are much smaller in mass than protons, weighing only 9.11 × 10-28 grams, or about 1/1800 of an atomic mass unit.Explanation:
Hope this helps50:06
Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two different metals?
Barium (Ba) is less reactive than calcium (Ca) because the valence electrons in calcium atoms are farther from the nuclei and harder to remove.
Strontium (Sr) is more reactive than magnesium (Mg) because the valence electrons in strontium atoms are farther from the nuclei and harder to remove.
Rubidium (Rb) is more reactive than sodium (Na) because the valence electrons in sodium atoms are closer to the nuclei and easier to remove.
Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.
Answer:
Rubidium belong to Alkaline group 1, and
Strontium belong to Alkaline group 2.
Explanation:
We know that elements are organized on the periodic table based on their properties. The statement correctly predicting and explaining the chemical reactivity of two metals is given below -Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.
1. How a car looks like it is moving slow as it passes you in another moving car is an example of _____.
2.The reading you see on your cars speedometer is an example of _____.
3. An object _____ is the distance and direction of the object change in position. It is not the same as distance.
4. If you are not showing down or spending up you are going at ____.
1.distance
Explanation:
I hope it will help you
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When one mole of a solute is present in 500 cm3 of solution, then the concentration of the solution is:
.)0.5 M
.)1 M
.)2 M
.)3 M
Answer:
0.5M is the answer.
Explanation:
1M solution is the solution containing 1mole solute dissolved per litre of solution.
Using unitary method,
1000cc gives 1M.
1cc gives 1/1000M.
500 cc gives 500/1000M=0.5M
which of the following groups of elements are likely to have substances that have both metallic and non metallic properties?
a. actinides
b. group 18
c. lanthanides
d. group 14
Answer is A
At the bottom of the periodic table is a special group of metallic radioactive elements called actinides or actinoids. These elements, usually considered ranging from atomic number 89 to atomic number 103 on the periodic table, have interesting properties, and play a key role in nuclear chemistry.
The correct option is D. Group 14 are metalloids and they contain both metals and non metals.
What are metalloids ?The lowest class of elements, known as the metaloids, only has six members: the elements boron, silicon, germanium, arsenic, antimony, and tellurium (Te). Metalloids have both nonmetal and metal qualities, including the ability to conduct electricity (elements that cannot conduct electricity).
The majority of metalloids, for instance, may conduct electricity, though not as well as metals. Metalloids frequently have a metallic sheen but a nonmetal brittleness.
Depending on the quantity of valence electrons they contain, metalloids can behave chemically like metals or nonmetals.
Therefore, The correct option is D. Group 14 are metalloids and they contain both metals and non metals.
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वार्षि
एउटा व्यक्तिले रु. 46875 को कर्जा लिएछ । यदि प्रतिवर्ष प्रति रुपैयाँ चक्रिय व्याजदर 4 पैसा भए कति वर्षमा रु. 5853 च.
25 ETSIT ? (A person took loan of Rs 46875. If the rate of compound interest is 4 paisa per rupee
year, in how many years will the compound interest be Rs 5853.) [2065 B, 067 D] Ans: 3
तार्षिक
पत्ता
Rs
200/-
Answer:
3 years
Explanation:
P= Rs 46875
R= 4 Pisa per rupee per year = 4% per annum
C. I = Rs 5853
t= time (the unknown)
Given;
Amount= P(1 + R/100)^t
Amount = (P + CI)
(46875 + 5853) = 46875 (1 + 4/100)^t
1.124864 = (1 + 4/100)^ t
1.124864 = (1.04)^t
t= 3 years
Describe two ways to separate a mixture and when you would you use it
Answer:
Filtration separates solids of different sizes.
Evaporation removes a liquid from a solution to leave a solid material.
Explanation:
Have a nice day.
What color of the spectrum contains the least amount of energy?
A. Red
B. Brown
C. Green
D. Violet
Answer:
red
Explanation:
Fill in the blanks to balance the following chemical equation.
__P +__02 - P406
Answer:
4P + 3O2 → P4O6
Explanation:
Chemical Equation Balancer Online!
The balanced chemical equation can be represented for the given reaction as:
[tex]4\;P + 3\;O_2\longrightarrow P_4O_6[/tex]
What is a balanced chemical equation?A chemical equation for a chemical reaction can be represented in terms of chemical symbols of the reactants and products. A balanced chemical equation in which the number of atoms of reactants and products is equal on either side of the equation.
The law of conservation of mass gives the idea that the total mass of both the reactant side and the product side is equal in a balanced chemical equation.
The given chemical equation has the given reaction:
[tex]4\;P + 3\;O_2\longrightarrow P_4O_6[/tex]
The number of phosphorous and oxygen atoms are equal on both sides of the arrow therefore it is a balanced chemical equation. Therefore, the mass of the phosphorus and oxygen elements will be equal on the reactant as well as product side.
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Y'all what about this one
Answer:
A=8, B=7,C=N
D=26, E=30, F =Fe
Which action describes a chemical change?
A.) Crushing Rock
B.) Lighting a Match
C.) Freezing Water
D.) Melting Ice
Answer:
B
Explanation:
a chemical change is something that can not be reversed, so you may think crushing a rock but it isn't because crushing a rock is a phisical change not chemical and if you freeze water you can melt it and of you melt ice you can freeze it, so those can be reversed. So the answer is B because that can not be reversed
Since new substances are formed in chemical changes, Lighting a Match is a chemical change., option B.
What is a chemical change?A chemical change refers to a change which is not easily reversible and in which new substances are formed.
In chemical changes, large amounts of heat is involved and changes in the mass of the original substance may occur.
Examples of chemical changes are combustion of substances, oxidation of substances, etc.
From the given options, the change which involves great heat changes and in which new sure are formed is Lighting a match.
Therefore, Lighting a match describes a chemical change, option B.
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What is the difference between the atomic number and the atomic mass?
Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus. It is the average weight of an element. It is the total number of nucleons in the atom's nucleus.
Explanation:
Hope this helps have a great day its kinda hard to put it in one sentence so uhh just read this and make it into one sentence
Answer:
atomic number is equal to no.of protons or no.of electrons and no.of neutros+atomic num=atomic mass
Explanation:
in above give the correct explanation
1. Amy's science teacher shows her class a model of an atom. Why is a model useful for studying atoms?
A. All atoms exist in the gas phase, and atmospheric gases are invisible.
B. A model is helpful to observe the behavior of the parts of an atom.
C. The parts of an atom cannot be directly observed.
D. A model of an atom is the same for all atoms.
Answer:
The parts of an atom cannot be directly observed.
Explanation:
An atom is the smallest indivisible particle of a substance that can take part in a chemical reaction.
Atoms are not observed with naked eyes because they are found in the realm of very small particles. It is impossible to observe the parts of an atom directly.
As a result of this, models suffice in explaining the parts of an atom. Hence the answer.
The theory of continental drift was widely unaccepted until scientists started using ________ the map the ocean floor.
A. Maps
B. SONAR (Sound Navigation Ranging)
C. Submarines
D. Volcanoes
plss helppp
Answer:
B Sonar
Explanation:
The theory of continental drift was widely unaccepted until scientists started using SONAR (Sound Navigation Ranging) the map the ocean floor. Therefore, option (B) is correct.
What is the SONAR?Sonar has full-form sound navigation and ranging which is a technique that uses sound propagation usually underwater to navigate, measure distances, and communicate with or detect objects.
Sonar can be used as a measurement of the echo characteristics of "targets" in the water. Sonar is used for robot navigation, while SODAR is used for atmospheric investigations.
The frequencies used in sonar systems vary from very low (infrasonic) frequency to extremely high frequency (ultrasonic). Ultrasonic waves are used in SONAR because they travel deep into the water without losing their power and their frequency ranges from 20Hz to 20,000Hz.
SONAR showed the mid of the Atlantic ridge is dividing plates such as the north Atlantic from the European plate which provides evidence of continental drift.
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a balance reads an object A to be 45.1kg the balance reads another object B to be 33.46kg what is the total weight of both objects
Answer:
78.56 kg
Explanation:
45.1 + 33.46 = 78.56
A ball of 8.5 kg is thrown upwards 16 meters. What is the gravitational potential energy gained by the ball? Estimate g as 9.81ms2.
Answer: 1,334 j
Explanation:
The gravitational potential energy gained by the ball of mass 8.5 kg thrown 16 m upwards is 1334.16 J
From the question given above, the following data were obtained:
Mass (m) = 8.5 Kg
Acceleration due to gravity (g) = 9.81 ms¯²
Height (h) = 16 m
Potential energy (PE) =?The gravitational potential energy gained by the ball can be obtained as follow:
PE = mgh
PE = 8.5 × 9.81 × 16
PE = 1334.16 JTherefore, the gravitational potential energy gained by the ball is 1334.16 J
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Do you think organ systems function independently of themselves, or do you think
they interact with other organ systems? Explain your reasoning.
Each organ system performs specific functions for the body, and each organ system is typically studied independently. However, the organ systems also work together to help the body maintain homeostasis. For example, the cardiovascular, urinary, and lymphatic systems all help the body control water balance.
Most matter in the universe is made up of me.
A
Metal
B
Nonmetal
Answer:
A. Metals
Explanation:
1. how does health and purity of the
hydrosphere impacts you?
(2-3 sentence needed)
2. what is something you can do to help with our water quality?
(1-2 sentences needed)
Answer:
2. Most people would get a germ protector. I would just get a water filter.
Explanation:
(Please help I will give brainliest to whoever answers)Classify each of the following as either an element, compound, mechanical mixture, solution, colloid or suspension
a. Gold
b. Kool-aid
c. Carbon dioxide
d. Tomato juice
e. Milk
f. Salad
Answer:
element:a,c
compound:f
mechanical mixture
solution:b
colloid:e
suspension:d
Explanation:
2NaOH+CO2----->Na2CO3+H2O
calculate the mass of sodium carbonate produced when 10.0 g of sodium hydroxide reacts with carbon dioxide.
Answer:
13.2 g Na2CO3
Explanation:
Convert 10.0 g NaOH to mol.
10.0 g x 1 mol/39.997 g = 0.250 mol
Use mol ration given by the equation: 2 mol NaOH to 1 mol Na2CO3
0.250 mol NaOH x 1 mol Na2CO3/2 mol NaOH = 0.125 mol Na2CO3
Finally, convert the moles of Na2CO3 to grams.
0.125 mol Na2CO3 x 105.99 g/1 mol = 13.2 g
According to stoichiometry,13.25 g of sodium carbonate is produced when 10 g of sodium hydroxide reacts with carbon dioxide.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
For the given reaction according to stoichiometry 2 molecules of sodium hydroxide react to give 1 molecule of sodium carbonate.
That is 80 g sodium hydroxide gives 106 g sodium carbonate
∴10 g sodium hydroxide will produce 10×106/80=13.25 g of sodium carbonate.
Thus, 10 g sodium hydroxide produces 13.25 g of sodium carbonate.
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Which eukaryotic cell does the organelle shown belong to?
CM
Answer:
The Eukaryotic cell that the organelle shows below belongs to the Nucleus.
Explanation:
In fact, the mere presence of a nucleus is considered one of the defining features of a Eukaryota cell.
In your own words, explain what the concept of density means—without using the formula.
Answer:
The amount of mass in a certain volume
Explanation:
Answer:
Density is mass divided by volume. Density is the determination of something floating or sinking.
Hope this helps!!!
When a change of substance occurs, and when solutions are
made, the changes that take place are known as
changes.
Physical or chemical change
Answer:
They are known as physical changes
does anyone know the known specific heat values for common materials
Answer:
Just look up specific heat capacity of a certain element and it should give you the specific heat in the form of energy/mass×temperature i.e J/kg°C (joules per kilogram, and degrees celsius).
what ions are present in solution sodium carbonate
The resulting solution is composed of separate sodium ions and carbonate ions surrounded by water molecules.
how has thermal energy, heat, and temperature change?
thermal energy leads to an increase in the kinetic energy also increasing in temperature hope this helped!
Answer:
thermal energy leads to an increase in the kinetic energy also increasing in temperature This is known because temperature is in fact the measure of the average kinetic energy of the molecules.
Explanation:
hope this helps❤️