Answer:
Acid reacts with water?
Explanation:
Where does the energy of a nuclear power plant come from?
A) the radiation released by unstable uranium isotopes
B) the heat energy released during nuclear fusion
C) the radiation released when hydrogen fuses into helium
D) the heat energy released during nuclear fission
Answer:
The heat energy released during nuclear fusion
The heat energy released during nuclear fusion. The correct option is D.
Thus, The Sun and other stars are powered by nuclear fusion reactions. A heavier nucleus is created when two light nuclei fuse together in a fusion reaction.
Because the mass of the resulting single nucleus is smaller than the combined mass of the two initial nuclei, the process produces energy. Remaining mass is converted to energy.
Why this happens is explained by Einstein's equation (E=mc2), which states in part that mass and energy can be transformed into one another. Fusion energy could be a significant source of energy generation if scientists can figure out how to use it in equipment on Earth.
Thus, The heat energy released during nuclear fusion. The correct option is D.
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What is one of the functions of the nucleus?
A.
to remove waste products from a cell
B.
to contain the genetic information of an organism
C.
to determine what materials can enter or leave a cell
D.
to provide structural support for a plant cell
Answer:
B.
to contain the genetic information of an organism
Explanation:
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus.
1. When a liquid becomes vapor, its gas particles begin to exert...
a. air pressure.
c. vapor pressure.
b. equilibrium pressure.
d. no pressure
Answer:
vapor pressure.
Explanation:
Answer:
I think it is vapor pressure or air pressure
In the modern periodic table, which of the following represents the last pair of elects for which Newlands' Law of Octaves would hold true?
1. AI and GA
2. AI and SI
3. NE and AR
4. MG and CA
Answer: Mg and Ca
Explanation:
In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.
Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.
In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.
Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.
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When we add friction into the skate park what happens to the skater? Skate park questions
Answer:
If you put friction in to skating rink then obvioulsy the skaters wont be able to glide and skate.
Explanation:
friction is power that disturbes the moving power. places like skating rink and slides try to have the least amount of friction.
state the difference between isotopes and isobars
Answer:
Isotopes:- these are those elements in which atoms are same but mass number is different. for eg:- 12^C 6.____________________________________________________________________________
Isobars:- these are those elements in which mass number is same but atoms are different. for example:- 2^Ca 18.What is the number of electronsin hydrogen?
Answer:
1
Explanation:
Which of the following characterizes a covalent bond?
A. An electronegativity of greater than 1.7 for one of the atoms
B. An electronegativity difference of greater than 1.7 between two
atoms
C. An electronegativity difference of less than 1.7 between two
atoms
D. An electronegativity of less than 1.7 for one of the atoms
Answer A. The electronegativity of one atom is less than 1.7
Answer: its C
Explanation: i just got it wrong the right answer is c
Which of the following is an element?
A.
magnesium chloride salt (MgCl)
B.
hydrochloric acid (HCl)
C.
carbon monoxide gas (CO)
D.
zinc metal (Zn)
Answer:
zinc metal (ZN) is an element
What involves a metal and nonmetal ionic or covalent bond
Answer:
An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
1. What are the characteristics of a solid? it has blank shape and a definite blank
Solids are defined by the following characteristics:
definite shape (rigid)
definite volume.
particles vibrate around fixed axes.
What is the balanced equation for the reaction of a solution of sodium sulfate is mixed with strontium chloride?
Select one:
a.Na2SO4(aq) + SrCl2(aq) = 2 NaCl(aq) + SrSO4(s)
b.Na2SO4(aq) + SrCl2(aq) = NaCl(s) + SrSO4(aq)
c.NaSO4(aq) + SrCl(aq) = NaCl(aq) + SrSO4(aq)
d.NaSO4(aq) + SrCl(aq) = NaCl(aq) + Sr2SO4(aq)
Answer:A
Explanation: reactants: Na2SO4 and SrCl2
Products: NaCl and SrSO4
1. Freon (CCl2F2) is commonly used in refrigerators and air conditioners as a coolant. How many grams of fluorine are there in the 2.00 lbs of Freon necessary for an air conditioner? (1 lb = 454 g)
Answer:
285g of fluorine
Explanation:
To solve this problem we need to find the mass of Freon in grams. Then, with its molar mass we can find moles of freon and, as 1 mole of Freon, CCl₂F₂, contains 2 moles of fluorine, we can find moles of fluorine and its mass:
Mass Freon:
2.00lbs * (454g / 1lb) = 908g of Freon
Moles freon -Molar mass: 120.91g/mol- and moles of fluorine:
908g of Freon * (1mol / 120.91g) =
7.5 moles of freon * (2moles Fluorine / mole Freon): 15 moles of fluorine
Mass fluorine -Atomic mass: 19g/mol-:
15 moles F * (19g / mol) =
285g of fluorineBased on the fossil records, what is true
concerning populations of organisms that lived on
Earth?
A. Most organisms are found in the earliest rock
layers.
B. Most organisms stayed the same over time.
C.
Most organisms that lived on Earth are
extinct.
Helpppppp
Answer:
C
Explanation:
The reason why is beacause most of the dino's and other spices that were here before humanity are exctinct. Some are still alive and have evovled into something greater such as a crocidile, and many other repitlians
Hope this helps!
Pls mark brainlest!
what are the uses of glycerin?
Explanation:
This medication is used as a moisturizer to treat or prevent dry, rough, scaly, itchy skin and minor skin irritations (e.g., diaper rash, skin burns from radiation therapy). Emollients are substances that soften and moisturize the skin and decrease itching and flaking.
A gas was at STP. If the pressure increased to 3.5 atm, what would the new
temperature be?
Answer:
T₂ = 956.0 K
Explanation:
Given data:
Initial temperature = 273.15 K
Initial pressure = 1 atm
Final pressure = 3.5 atm
Final temperature = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
1 atm / 273.15 K = 3.5 atm / T₂
T₂ = 3.5 atm ×273.15 K / 1 atm
T₂ = 956.0 atm. K / 1 atm
T₂ = 956.0 K
Do the molecules of a liquid have (more, less, or the same) freedom of movement as the molecules of a gas? *
Why does the mass of steel wool increase after getting burned? Help pls
Answer:
heat and large amount of surface area
Explanation:
the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool
The mass of steel wool increases after burning because it reacts with oxygen in the air, leading to the formation of iron oxide.
After burning, steel wool's bulk grows due to the oxidation process. Iron oxide, also referred to as rust, is created when steel wool burns when it comes into contact with oxygen from the air.
The steel's iron reacts chemically with the oxygen to create iron oxide, which is heavier than the original iron. As a result of going through the oxidation process and becoming iron oxide, steel wool gains bulk.
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Suppose you have 28.9 grams of elemental germanium, what mass would be the isotope germanium - 72?
34.5 grams
because the mass would multiply and do mass things
2. What are the ions present in the compound CsF? *
(1 Point)
O Cs- and F-
Cs- and F+
Cs+ and F-
Cs and F only
Answer:
Cs+ and F-
Explanation:
The compound CsF is made up of two elements; Caesium (Cs) and F (Flourine)
Caesium is a metal and would therefore lose electrons - a cation is formed. When Caesium loses a single electron, the ion symbol is given as; Cs+
Flourine is a non metal and would therefore gain electrons - an anion is formed. When Flourine gains a single electron, the ion symbol is given as; F-
Hence the correct option is;
Cs+ and F-
Which of the following statements is/are correct?
I.
II.
Mass of 1 atom of Carbon-12 is equal to 1 amu
Mass of 4 atoms of Carbon-12 is equal to mass of 3 atoms of Oxygen-16
(A) Only I
(B) Only II
(C) Both I and II
(D) None of them
Answer:
The correct statement is;
(B) Only II
Explanation:
I) The atomic mass unit or amu which is also known as daltons which is defined as 1/12 × the mass of a carbon-12 atom, which is therefore, 1.660538921 × ⁻²⁴ grams
Therefore, the mass of 1 atom of carbon-12 = 12 amu
II) The mass of one mole of oxygen-16 is 16 grams while the mass of one mole of carbon-12 is 12 grams
The mass of 4 atoms of carbon 12 = 4 × 12 amu = 48 amu
The mass of 1 atom of oxygen-16 = 15.99491461956 amu
Therefore, the mass of 3 atoms of oxygen-16 = 3 × 15.99491461956 = 47.9847438587 amu ≈ 48 amu
Therefore only II is correct.
help!!
The volume of air in the lungs of a typical human is 6.0 L. Traditional free divers, known for their ability to hold their breath during long dives while gathering objects from the ocean bottom, could descend underwater to a depth of 30 m where the pressure is four times that at the surface. What would be the volume of air in their lungs at 30 m?
please!!
Answer: these are for questions 1,2,4,5,7
Explanation: number 3: as the pressure in the volume decreases, the volume increases causing it to expand and eventually blow.
number 6: because the temperature and the amount of gas don’t change, these terms don’t appear in the equation. What Boyle’s law means is that the volume of a mass of gas is inversely proportional to its pressure. This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.
hope this helps :))
Which is a gas at room temperature?
A) aluminum
B) nitrogen
C) potassium
D) sodium
Answer:
B) nitrogen
the Earth's atmosphere is mostly nitrogen
what is the best example of energy is transferred object to object
electric energy to heat and light energy
15 grams of hydrogen and 7.5 grams of oxygen were placed in a beaker. An explosion happened inside the baker that produced water. The beaker was never opened. How many grams of water were produced?
Answer:
16.8768 g
Explanation:
The reaction that takes place is:
2H₂ + O₂ → 2H₂OFirst we convert the mass of hydrogen and oxygen into moles, using their respective molar masses:
H ⇒ 15 g ÷ 1 g/mol = 15 mol HO ⇒ 7.5 g ÷ 16 g/mol = 0.4688 mol OThere are significantly less oxygen moles than hydrogen moles, so oxygen is the limiting reactant.
We calculate the produced moles of water, using the moles of the limiting reactant:
0.4688 mol O * [tex]\frac{2molH_2O}{1molO_2}[/tex] = 0.9376 mol H₂OFinally we convert water moles into grams, using its molar mass:
0.9376 mol H₂O * 18 g/mol = 16.8768 gIf Veronica spins in a circle with the compass in her hand, which force keeps the compass' needle pointing north?
A.
an electrical force
B.
a magnetic force
C.
a contact force
D.
a gravitational force
If Veronica spins in a circle with the compass in her hand, then the force which keeps the compass' needle pointing north is magnetic field.
What is magnetic force?The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. In a magnetic field, a moving charge receives a force that is perpendicular to both its velocity and the magnetic field.
The magnetic field is defined as a region where the force is active along imaginary lines. This force has an effect on all magnetized objects from the south magnetic pole to the north magnetic pole, including the needle of a compass. The needle always points north magnetic pole under the influence of the Geomagnetic field.Hence the required force is a magnetic force.
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What is one difference between Group 2 and Group 15 of the Periodic Table of Elements?
Answer:
Nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc)
Explanation:
Which of the following would be an example of applied science?
Investigating how carbon dioxide levels impact ocean pH
Investigating why water expands when it freezes
Investigating the conductivity of metalloids
Investigating how to develop a more efficient solar panel
Answer:
Investigating how carbon dioxide levels impact ocean pH
Explanation:
I hope this helps! :)
how ferons is responsible for depletion of ozone layer?
How many molecules are in 200.0 g of ammonium sulfide
Answer: 1.51355 mol.
Explanation: