the answer is ( . a rocket in space )
Answer:
The correct option is B
Explanation:
The mass of an object is the amount of substances/molecules present in that object. The mass of an object remains the same anywhere regardless of gravity. In space, where there is no gravity, the mass of a rocket remains the same but the weight will be different because of zero gravity which means there will be no force of gravity pulling the rocket towards itself.
Hence, weight can be calculated as
Mass of an object (in kg) × gravitional field strength (in N/kg)
From the above formula, it can be deduced that weight is dependent on mass and gravity but mass is not (when you make mass the subject of the formula).
When is it appropriate to use models?
Models should be used only when explaining submicroscopic matter.
Models should be used to complicate the phenomena so it is more realistic. Model should be used once they are completely accurate for all the scientific data. Models should be used when needed to explain or predict data being represented.
your answer should be the last one: models should be used when needed to explain or predict data being represented.
hope this helps :)
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A natural gas stove transforms R energy into P energy.
What do R and P most likely represent?
A.) R represents chemical energy, P represents thermal energy
B.) R represents thermal energy, P represents chemical energy
C.) R represents potential energy, K represents electrical energy
D.) R represents electrical energy, K represents potential energy
What do R and P most likely represent?
A.) R represents chemical energy, P represents thermal energy
B.) R represents thermal energy, P represents chemical energy
C.) R represents potential energy, K represents electrical energy
D.) R represents electrical energy, K represents potential energy
Answer is: A.) R represents chemical energy, P represents thermal energy.
A natural gas stove transforms R energy into P energy.
For example methane is natural gas.
Balanced chemical reaction of methane combustion:
CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) ΔH = -802.3 kJ.
This is exothermic reaction, energy is released in form of heat.
The law of conservation of energy states that the total energy of an isolated system remains constant; energy can neither be created nor destroyed; it can only be transformed or transferred from one form to another.
Identify what type of reaction is below. Also, determine what coefficients that would balance the chemical equation. ___ C4H10 + ___O2 → ___ CO2 + ___H2O
This is a combustion reaction because it is being combined with oxygen. Then to balance you will put the number of carbons you have or 4 in front of the CO2 and then same with H2. Then you will add up the oxygen and divide it by two to get. 1, (13/2), 4, 5
Choose the number of significant figures 60.0
In this case there are 3 significant figures.
Any zeroes after another number, (i.e. 9300.000), you consider these numbers.
If there is something like 0.0060, this would be two significant digits.
Zeroes before a number are not significant, anything after are.
Hope this helps any confusion!
Please mark me brainliest!
Answer:
3 significant figures
Explanation:
The rules for deciding which digits in a measurement are significant are as follows:
1) All nonzero digits are significant.
2) Sandwiched (or embedded) zeros, those between significant digits, are significant.
3) Leading zeros, which are zeros at the beginning of a decimal number less than 1, are not significant.
4) Trailing zeros, which are zeros at the end of a number, are significant only if the number has a decimal point.
By rule 4 since 60.0 has a decimal point all 3 figures are significant
What is the mass of 2.80 grams of H2O
The mass of 2.80 grams of h2o is 18.02 amu I believe
Answer to the last part 48 part D!!!
Answer :
In general trend,
The size of the element increases as we go down in a same group.
And the electronegativity of the element decreases as we go down in a same group.
For example : The two elements Magnesium and Calcium in a same group number 2.
The size of calcium is greater than the magnesium because as we go down in a group the atomic radius increases and the size also increases. And the electronegativity of calcium is less than the magnesium because as we go down in a group the electronegativity decreases.
which of these is a trace fossil : shrimp burrow, seashell, dinosaur egg, shark tooth
Shrimp burrow which is one of the examples of trace fossils.
Answer:
Option (1)
Explanation:
Trace fossils are defined as those traces such as the impressions and signs of ancient remains of an organism, that are found over relatively softer sediment.
These play a very important role in the field of paleontology as it provides information about the ancient organism that lived in the past in a particular location.
Some of the examples of trace fossils are track and trails, burrows, footprints, cast and mold.
Shrimp burrows are an example of trace fossils, which are made by the marine organisms named shrimps, that are usually found at the bottom of the ocean.
Thus, the correct answer is option (1).
which is the empirical formula for hydrogen peroxide
H2O2 i think this is it
H2O2 i believe is the answer sorry if im wrong
Which of the following must be true about a reaction if it is only spontaneous at high temperatures?
It is exothermic, with both negative enthalpy and entropy changes.
It is endothermic, with both positive enthalpy and entropy changes.
It is exothermic, with a negative enthalpy and positive entropy change.
It is endothermic, with a positive enthalpy and negative entropy change.
2. If the reaction between two solutions has a positive enthalpy change, which of the following best describes the reaction? (2 points)
It is exothermic and heat is added to the system.
It is endothermic and heat is added to the system.
It is exothermic and heat is lost to the surroundings.
3) Which statement below best describes the relationship of the reaction below? (2 points)
3A + B yields 2AB
The rate of formation of AB is twice the disappearance of A.
For every two AB produced, the reaction requires three A.
The rate of disappearance of A is two times the formation of AB.
4) Describe how you would use the information depicted on the potential energy diagram below to determine the amount of required activation energy and the enthalpy change of the reaction. (2 points)
(see chart)
Reactions spontaneous at high temperatures are endothermic with both positive enthalpy and entropy changes, and positive enthalpy change implies an endothermic reaction. In 3A + B yields 2AB, for every two AB produced, three A are required. On a potential energy diagram, activation energy and enthalpy change are found by comparing potential energy of different stages.
Explanation:If a reaction is only spontaneous at high temperatures, then it must be endothermic, with both positive enthalpy and entropy changes. When a reaction has a positive enthalpy change, this means it's endothermic and heat is added to the system. In response to part 3 of your question, for the reaction 3A + B yields 2AB, it's accurate to say that for every two AB produced, the reaction requires three A.
Now, regarding how to use a potential energy diagram to find out about required activation energy and enthalpy change of a reaction: The activation energy is represented by the difference in potential energy from the reactants to the top-most point (peak) of the diagram.
The enthalpy change of the reaction, on the other hand, is determined by the difference in potential energy between the reactants and the products. If the products have less potential energy than the reactants, the reaction is exothermic; if they have more, the reaction is endothermic.
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How does atom electronegativity affect bond character and molecular polarity?
In case of heteroatomic molecules there is possibility of difference in electro negativity of the two hetero atoms bonded, this results in development of charges on the two atoms
more electronegative element will have a negative charge
less electronegative element will have a positive charge
Case
a) if the difference is less than 0.4 the molecule is nonpolar.
b) if the difference is from 0.4 to 1.7 the molecule is polar covalent.
c) if the difference is more than than 1.7 the molecule ionic (polar).
What are some common properties of covalent compounds
Most covalent compounds have relatively low melting points and boiling points.
Covalent compounds usually have lower enthalpies of fusion and vaporization than ionic compounds.
Covalent compounds tend to be more flammable than ionic compounds.
Covalent compounds are characterized by their lower melting and boiling points, poor conductivity, varied solubility in water depending on molecular polarity, and being typically gases or liquids at room temperature. These properties stem from the sharing of electrons between nonmetallic elements, forming covalent bonds.
Covalent compounds exhibit unique characteristics due to the sharing of electrons between nonmetallic elements. These shared electrons create bonds that are central to the distinct properties of covalent compounds. A deeper understanding of these properties highlights the differences between covalent and ionic compounds.
Key Properties of Covalent Compounds
Lower Melting and Boiling Points: Covalent compounds generally have much lower melting and boiling points compared to ionic compounds. This is because the intermolecular forces in covalent compounds are weaker than the ionic bonds in ionic compounds.Poor Conductivity: In any state, whether solid, liquid, or gas, covalent compounds are poor conductors of electricity because they are electrically neutral.Solubility: Most covalent compounds are insoluble in water, and their solubility largely depends on molecular polarity.Physical State: Many covalent compounds are liquids or gases at room temperature, indicating their weaker forces and lower energy stability compared to ionic compounds, which are often solid.In essence, covalent bonding results in compounds with distinct physical states and functionalities, emphasizing the diversity of chemical compounds and their varied applications.
A piston in a heat engine does 500 joules of work, and 1400 joules of heat are added to the system. Determine the change in internal energy and explain how this example demonstrates the conservation of energy.
Answer : The change in internal energy is, 900 Joules.
Solution : Given,
Heat given to the system = +1400 J
Work done by the system = -500 J
Change in internal energy is equal to the sum of heat energy and work done.
Formula used :
[tex]\Delta U=q+w[/tex]
where,
[tex]\Delta U[/tex] = change in internal energy
q = heat energy
w = work done
As per question, heat is added to the system that means, q is positive and work done by the system that means, w is negative.
Now put all the given values in the above formula, we get
[tex]\Delta U=(+1400J)+(-500J)=900J[/tex]
Therefore, the change in internal energy is 900 J.
The change in internal energy depends on the heat energy and work done. As we will change in the heat energy and work done, then changes will occur in the internal energy. Hence, the energy is conserved.
which has a higher temperature?
A.a small cup of boiling hot water B. a large pot of boiling hot water C. they have the same temperature
This answer varies. It would be B. because it's a large pot of water ( made of steel, iron or whatever ) and since it's a good conductor, it would transfer heat energy to the water and keep it warm.
It may not be A. because it's a small cup and the more molecules or matter it has the more thermal energy so it likely they would both be the same temperature.
Hope that helps.
The Lewis dot model of a metal atom has two dots. Which of the following is true about the atom?
It is most likely to form covalent bonds.
It has two electrons in the innermost energy level.
It requires six other atoms to form a stable compound.
It is present in the second group of the periodic table.
Answer : the statement that is true about the atom is It is present in the second group of the periodic table.
Explanation :
The Lewis dot model shows the number of valence electrons present in the atom.
Since the given metal has 2 dots, it indicates that the metal atom must have 2 electrons in its outermost shell.
Therefore option 2 : It has two electrons in the innermost energy level, is wrong because it contains 2 electrons in the outermost energy level
Option 1 : It is most likely to form covalent bonds is also wrong because a metal atom always forms ionic bond
Option 3 : It requires six other atoms to form a stable compound, is also wrong as the metal can form a stable compound by donating its 2 electrons to a non metal.
On periodic table, representative elements are arranged in groups based on their valence electrons. Therefore by knowing the outermost electrons, we can predict the group in which the element can be categorized.
Since the given metal atom contains 2 electrons, it must be present is second group.
Therefore the statement that is true about the atom is It is present in the second group of the periodic table.
Which field would modify a cow's DNA to produce more milk?
The answer would be D.) Genetic Engineering
After a baseball has been pitched, it moves toward the catcher. While the ball is in the air, how does its vertical speed change over time?
A.It speeds up.
B.It slows down.
C.It stays constant.
I think it would either be (A) or (B)
It would slow down or stay constant - but it wouldn't speed up.
I think the answer is C. because I got this question wrong when I picked answer choice B. And it would be impossible for the ball to speed up.
match the bond its formula
1.___ NaCl . a.covalent
2.___CO2 . b.metallic
3.___ZnCu . c. ionic
1. c. ionic___ NaCl .
2. a.covalent___CO2
3. b.metallic ___ZnCu
A 0.630 gram sample of a metal, M, reacts completely with sulfuric acid according to:A volume of 291 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and the temperature is 25 °C. The vapor pressure of water at various temperatures can be found in this table. Calculate the molar mass of the metal.
Answer:
55.0 g/mol
Step-by-step explanation:
Step 1. Partial pressure of hydrogen
You are collecting the gas over water, so
[tex]p_{\text{atm}} = p_{\text{H}_{2}} + p_{\text{H}_{2}\text{O}}[/tex]
[tex]p_{\text{H}_{2}} = p_{\text{atm}} - p_{\text{H}_{2}\text{O}}[/tex]
[tex]p_{\text{atm}} = \text{756.0 Torr}[/tex]
At 25 °C,[tex]p_{\text{H}_{2}\text{O}} = \text{23.8 Torr}[/tex]
[tex]p_{\text{H}_{2}} = \text{756.0 Torr} - \text{23.8 Torr} = \text{732.2 Torr}[/tex]
===============
Step 2. Moles of H₂
We can use the Ideal Gas Law.
pV = nRT Divide both sides by RT
n = (pV)/(RT)
p = 732.2 Torr Convert to atmospheres
p = 732.2/760
p = 0.9634 atm
V = 291 mL Convert to litres
V = 0.291 L
R = 0.082 06 L·atm·K⁻¹mol⁻¹
T = 25 °C Convert to kelvins
T = (25 + 273.15 ) K = 298.15 K
n = (0.9632 × 0.291)/(0.082 06 × 298.15)
n = 0.2804/24.47
n = 0.011 46 mol
===============
Step 3. Moles of metal
The partial chemical equation is
M + H₂SO₄ ⟶ H₂ + …
The molar ratio of M:H₂ is 1 mol M:1 mol H₂.
Moles of M = 0.011 46× 1/1
Moles of M = 0.011 46 mol M
===============
Step 4. Atomic mass of M
Atomic mass = mass of M/moles of M
Atomic mass = 0.630/0.011 46
Atomic mass = 55.0 g/mol
how does the ph of hydrochloric acid change when copper oxide is graduallt added to hydrochloric acid until excess?
does it increase? decrease?
Copper does not react with HCl acid, but copper oxide does react. A metal-acid reaction is always a redox reaction. Since copper has a higher reduction potential than hydrogen, it does not react with non-oxidising acids like HCl or dil.H2SO4.
In a butane lighter, 9.7 g of butane combines with 34.7 g of oxygen to form 29.3 g carbon dioxide and how many grams of water
The balanced reaction is:
2C4H10 + 13O2 ---> 8CO2 + 10H2O
9.7g + 34.7g = 29.3g + -------g
Total mass of reactants = total mass of products
44.4g = 29.3 + g of water
44.4 - 29.3 = g of water
15.1g = g of water
grams of water produced here is 15.1g
In a butane lighter, 9.7 g of butane reacts with 34.7 g of oxygen to form 29.3 g of carbon dioxide. To determine the mass of water formed, we need to calculate the moles of carbon dioxide produced and then use the balanced chemical equation to determine the moles of water formed.
Explanation:In a butane lighter, 9.7 g of butane reacts with 34.7 g of oxygen to form 29.3 g of carbon dioxide.
To determine the mass of water formed, we need to calculate the moles of carbon dioxide produced and then use the balanced chemical equation to determine the moles of water formed.
From the balanced equation:
2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
Based on the equation, for every mole of carbon dioxide formed, we have 10/8 moles of water. Therefore, the moles of carbon dioxide produced can be calculated as:
Moles of CO2 = (mass of CO2 / molar mass of CO2)
The mass of water formed can then be calculated as:
Mass of H2O = (moles of CO2) * (molar mass of H2O)
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Does this equation support the law of conservation of mass?
this equation does support the law of conservation of mass.
What is the mole ratio of D to A in the generic chemical reaction? 2A+B >C+3D
Answer: The mole ratio of D : A is 3 : 2.
Explanation: Mole ratio for a chemical reaction is the ratio of their respective stoichiometric numbers or the ratio of their moles in a chemical reaction.
For a given chemical reaction:
[tex]2A+B\rightarrow C+3D[/tex]
By stoichiometry,
2 moles of A is reacting with 1 mole of B to produce 1 mole of C and 3 moles of D.
So, Mole ratio of D is to A will be 3 : 2
Answer: D : A is 3 : 2.
Explanation:
The law of definite proportion is being used here. The law states that a given compound always has the same proportion of its constituent elements by mass. The numbers written in the equation are used to balance it, which is an important part whilst determining the mole ratio
Keeping in mind law:
2a + b => c + 3d
Using the concept of stoichiometry coefficients of d and a
So the ratio of d:a is 3:2
which statement is true of any chemical reaction?
A) the mass of the reactants is always greater than the mass of the products
B) The mass of the products is always greater than the mass of the reactants
C) there is no relationship between the mass of the reactants and products
D) the mass of the reactants equals the mass of the products
According to the Law of Conservation of Mass,
The mass of the products in a chemical reaction must equal the mass of the reactants.
∴ D is the Answer
Answer:
D) the mass of the reactants always equals the mass of the products
Explanation:
I got this right during a test :)
A sample of nitrogen gas occupies 2.49 L at 19.5°C. The volume of the container changes at constant pressure to 4.29 L. What temperature (in°C) must the gas be to attain this volume?
Answer : The final temperature of the gas must be [tex]33.596^oC[/tex]
Solution : Given,
Initial volume of gas = 2.49 L
Final volume of gas = 4.29 L
Initial temperature of gas = [tex]19.5^oC[/tex]
According to the Charles' law, the volume of gas is directly proportional to the temperature of the gas at constant pressure.
[tex]V\propto T[/tex]
[tex]\frac{V_1}{V_2}=\frac{T_1}{T_2}[/tex]
Now put all the given values in this formula, we get the final temperature of the gas.
[tex]\frac{2.49L}{4.29L}=\frac{19.5^oC}{T_2}[/tex]
By rearranging the term, we get
[tex]T_2==33.596^oC[/tex]
Therefore, the final temperature of the gas must be [tex]33.596^oC[/tex]
what is the difference between potassium 39, 41, and 40
What is the chemical formula for aluminum fluoride? A) Al3F B) AlF C) AlF3 D) AlFl3
Answer : The chemical formula for aluminum fluoride is [tex]AlF_3[/tex]
Explanation :
Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.
Ionic compound are usually formed when a metal reacts with a non-metal.
The nomenclature of ionic compounds is given by:
1. Positive ion is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
3. In case of transition metals, the oxidation state are written in roman numerals in bracket in-front of positive ions.
The given compound is, aluminum fluoride.
Aluminum fluoride is an ionic compound because aluminum element is a metal and fluorine element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.
The charge on aluminum is (+3) and the the charge on fluorine is (-1). Both combine with the an ionic bond by the criss-cross method. Thus, the formula of the compound potassium chloride will be [tex]AlF_3[/tex]
Hence, the chemical formula for aluminum fluoride is [tex]AlF_3[/tex]
The chemical formula for aluminium fluoride is AlF₃. Therefore, option C is correct.
A chemical formula is a notation that represents the composition of a chemical compound. It uses chemical symbols and subscripts to indicate the types and number of atoms present in the compound.
In the chemical formula, the chemical symbols of the elements are used to represent the different types of atoms. Subscripts are used to indicate the number of atoms of each element in the compound. They are written as small numbers to the right of the chemical symbol.
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If the altitude of an isosceles right triangle has a length of x units, what is the length of one leg of the large right triangle in terms of x?
Hi,
An isosceles triangle is a triangle containing two sides of same length & one side of larger length.
Suppose we have a isosceles triangle ABC as depicted in the figure attached.
Here we see that side AB is equal to the side BC
The angle at point A is same as the angle at point C that is almost 45 degrees, Moreover, triangle BDC and ABD are also isosceles.
If: BD=AD=x , then , BD=DC=x
We can see in the figure that AC is equal to AD+ DC
Which means, AC= x+ x= 2x
Now we need to find out the length of AB, here we will use Pythagorean Theorem.
AC^2 = AB^2 + BC^2
Since BC= AB, so we can write it as:
AC^2 = 2AB^2
Taking sq. root on both sides
AC= 2AB
AB= AC/√2
Putting the value of AC as 2x
AB= 2x/√2
Which means AB= x√2
Therefore,the length of one leg of the large right triangle in terms of x will be x√2
Hope it helps!
Answer:
X square root 2
Explanation:
Hello hello hello! I am taking this quiz right now and will take it down if it is wrong and correct it, but I think it is right!
Can someone PLEASE HELP me?
How can you tell if a bond is Covalent?
Is fluorine a metal or a nonmetal? How many valence electrons does a fluorine atom have?
Answer: The given element is non-metal and the number of valence electrons are 7
Explanation:
There are 2 types of elements in the periodic table:
Metals are the elements which have a tendency to loose electrons and thus they form cations. Example: Sodium will loose 1 electron to form [tex]Na^+[/tex] ion.Non-metals are the elements which have a tendency to gain electrons and thus they form anions. Example: Chlorine will gain 1 electron to form [tex]Cl^-[/tex] ion.Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.
We are given:
Fluorine is the 9th element of the periodic table having electronic configuration of [tex]1s^22s^22p^5[/tex]
This element will gain 1 electron to form [tex]F^-[/tex] ion
Number of valence electron in fluorine element = 2 + 5 = 7
Hence, the given element is non-metal and the number of valence electrons are 7