Answers
Q = m.c.AT
m = 50,0 g of iron
c = 0.450 J.g-1°C-1
AT = 10°C
Thus
Q = 50 * 0.450 * 10
Q = 225 J
Is the heat energy
Hope it helps xx
Related Questions
Balance the chemical equations: 1) ___ N2O5 → ___ N2 + ___ O2 2) _____Fe + _____O2 → _____ Fe2O3 3) _____H2 + _____Cl2 → _____HCl
Answers
2) 4, 3, 2
3) 1, 1, 2
Answer:
2N2 + 5O2 => 2N2O5
4Fe + 3O2 => 2 Fe2O3
H2 + Cl2 => 2 HCl
What element is depicted by the following electron configuration:
(The electron configuration is in the image)
A. None of these
B. Oxygen
C. Chlorine
D. Sulfur
Answers
Explanation:
Your required answer is sulpher.
Hope it helps...
You are given two aqueous solutions with different ionic solutes (Solution A and Solution B). What if you are told that Solution A has a greater concentration than Solution B by mass percent, but Solution B has a greater concentration than Solution A in terms of molality? Is this possible? If not, explain why not. If it is possible, provide example solutes for A and B and justify your answer with calculations.
Answers
Answer:
Yes, it is possible. Let us consider an example of two solutions, that is, solution A having 20 percent mass RbCl (rubidium chloride) and solution B is having 15 percent by mass NaCl or sodium chloride.
It is found that solution A is having more concentration in comparison to solution B in terms of mass percent. The formula for mass percent is,
% by mass = mass of solute/mass of solution * 100
Now the formula for molality is,
Molality = weight of solute/molecular weight of solute * 1000/ weight of solvent in grams
Now molality of solution A is,
m = 20/121 * 1000/80 (molecular weight of RbCl is 121 grams per mole)
m = 2.07
Now the molality of solution B is,
m = 15/58.5 * 1000/85
m = 3.02
Therefore, in terms of molality, the solution B is having greater concentration (3.02) in comparison to solution A (2.07).
please help :) How can scientists ensure that their data are reliable? A) by making a single observation B) by recording values without units C) by keeping the results private D) by repeating trials during an experiment
Answers
Answer:
D. by repeating trials during an experiment
Explanation:
chile its actually d
Explanation:
explain using diagrams how potassium forms the compound potassium flouride when it reacts with flourine
Answers
Answer:
The answer to your question is given below.
Explanation:
Potassium (K) has 19 electrons with electronic configuration of 2, 8, 8, 1.
Fluorine (F) has 9 electrons with electronic configuration of 2, 7.
Fluorine needs 1 electron to complete it's octet configuration.
Hence, potassium (K), will lose 1 electron to fluorine (F) to form potassium ion (K+) with electronic configuration of 2, 8, 8. The fluorine atom (F) will receive the 1 electron from potassium to form the fluoride ion (F-) with electronic configuration of 2, 8.
**** Please see attached photo for further details.
when an atom gains an electron,what charge does the ion have
Answers
Answer:
if an atom gains an electron, the ion has negetive charge
Describe the reaction of an acid with an alkali.?
Answers
Your question has been heard loud and clear.
The reaction of an acid with an alkali is neutralization reaction. It is a neutralization reaction because , they both neutralize each other (means it makes them chemically inactive after reacting) and produce a salt , and maybe water too.
An example: hydrochloric acid + sodium hydroxide → sodium chloride + water
Thank you
it will neutralise because if you add both of them together with a matching Ph such as 5 and 9 equally then it will neutralise and have a Ph of 7
could you please make me brainliest
what is a disavanege for renewable solor power
Answers
2. Weather Dependent.
3. Solar Energy Storage Is Expensive.
4. Uses a Lot of Space.
5. Associated with Pollution.
What characteristic best describes the low entropy associated with solids?
O A. The atoms are held together with strong bonds.
O B. The atoms are arranged in a rigid structure.
C. The solid has a high specific heat capacity
D. The atoms in a solid are mostly metals.
Answers
Answer:
B. The atoms are arranged in a rigid structure.
Explanation:
Because the entropy of solids depends on the structure of the atoms, a rigid structure has less randomness = less entropy. So, the answer is B.
Answer:
b
Explanation:
a p e x :)
List down the observations made by Rutherford during the gold foil experiment.
Answers
Answer:
1) The volume occupied by an atom is composed of mainly empty space
2) Atoms have a very small, relatively dense, central nucleus that is positively charged
3) The region around the nucleus of an atom are orbited by negatively charged electrons in a the same fashion planets orbit around the Sun.
Explanation:
The selection of gold for the gold foil experiment was due to its ability to be rolled into extremely thin sheets such that it was expected for alpha particle to perforate or pass through the foil.
PLEASE PLEASE HELP!!!! What is the mass of a sample material that has a volume of 72.2cm³ and a density of 7.7g/cm³?
Answers
Answer:
The answer is
555.94g
Explanation:
To find the mass of a substance given it's density and volume we use the formula
[tex]Density \: = \frac{mass}{volume} [/tex]Making mass the subject we have
mass = Density × volume
From the question
Density = 7.7 g/cm³
Volume = 72.2 cm³
Substitute the values into the above formula
That's
mass = 7.7 g/cm³ × 72.2 cm³
We have the final answer as
mass = 555.94gHope this helps you
Answer in the correct significant figures: 31.2 x 4.13*
Answers
Answer:
1.29* 10^2
Explanation:
multiply them and then round
Copper turns a green-brown when it is exposed to oxygen in air. What chemical property of oxygen causes this effect? A. its reactivity B. its volume C. its mass D. its flammability
Answers
Answer:
A. its reactivity
Explanation:
It's reactivity because copper was exposed to air and if it is reactivity it must be exposed to air
Answer:
A. reactivity
Explanation:
Which of these is true about electrons? posses a positive electrical charge of one (+1) have a negative electrical charge of one (-1) indicates the number of protons in each atom equals the sum of protons plus neutrons in each atom
Answers
Answer:
have a negative electrical charge of one (-1)
Explanatio
Electrons have an electrical charge of negative one. When you think electron, always think -1
If a sample of aluminum with a density of 2.70 g/cm^3 displaces 36.0 mL of water when placed in a beaker, what is its mass?
13.3 g
97.2 g
0.075 g
Answers
Answer:
The answer is 97.2g .
Explanation:
Given that 1 mL is equals to 1 cm². Then we have to apply Density formula :
[tex]density = \frac{mass}{volume} [/tex]
[tex]let \: density = 2.7 \: , \: volume = 36[/tex]
[tex]2.7 = \frac{mass}{36} [/tex]
[tex]mass = 2.7 \times 36[/tex]
[tex]mass = 97.2 \: grams[/tex]
When a substance's particles are packed together tightly and have a definite shape and
volume...it is said to be in what state?
solid
gas
plasma
liquid
Answers
Answer:
solid
Explanation:
what is organic chemistry
Answers
Answer:
Organic chemistry
Explanation:
Organic chemistry is part of the chemistry that studies carbon compounds, which also use organic compounds, which have characteristics.
If the molarity of sugar is 1.1, what will the freezing point be?
Answers
Answer:
The freezing point will be -2.046°C.
Explanation:
The freezing point depression equation is [tex]\Delta T_f = k_f \cdot m \cdot i[/tex]
Where;
[tex]\Delta T_f[/tex] = The temperature depression of the freezing point
[tex]k_f[/tex]= The constant of freezing point depression which is solvent dependent = 1.86°C/m
i = The number of particles the substance decomposes into in solution = 1 for sugar (a covalent compound)
m = The molality of the solution = 1.1
Therefore, we have;
[tex]\Delta T_f = 1.86 \times 1.1 \times 1 = 2.046 ^{\circ}C[/tex]
Therefore the freezing point will be 0 - 2.046°C = -2.046°C.
What is the main factor responsible for the acidic and basic character of oxides?
Explain your answer.
Answers
Explanation:
We define non-metal oxide acidity in terms of the acidic solutions formed in reactions with water. For example, sulfur trioxide reacts with water to forms sulfuric acid. In sum, acidic oxides are oxides of non-metals, and basic oxides are oxides of metals. ... CrO is basic, Cr2O3 is amphoteric and CrO3 is acidic.Reply me in commentsIn common speech, some people may use the terms hypothesis and theory interchangeably. In science, however, the terms have different meanings. What do you think is an important difference between a hypothesis and a theory?
Answers
Answer: In science, a hypothesis is a possible explanation for an observation, while a theory is an explanation that is supported by a large body of evidence.
Explanation: exact answer
What are the requirements of any hypothesis in science?
Answers
Answer:
A scientific hypothesis must meet 2 requirements:
Explanation:
A scientific hypothesis must be testable, and;
A scientific hypothesis must be falsifiable.
Lab Safety Rule #3 says to always add acids or bases to the solvent and NEVER the other way around true or false?
Answers
Answer:
true
Explanation:
The standard laboratory rule is to always add acids or bases to solvent and not the other way round.
The dissolution of concentrated acids/bases in solvents (water) generates heat energy. Thus, if the solvent is added to them, a layer of hot weak acid or base will be formed and this will boil and spray around, causing an explosion.
On the other hand, if acid/base is added to solvents, they flow into the solvents and get diluted immediately without any boiling taking place. Hence, it is safe to add acid/base to solvents and not the other way round.
C12H26 has a what boiling point than C10H22. higher or lower
Answers
Answer the question in attachment and can I ask from which country you are.
I am new on this app.
✌️✌️☺️☺️
Answers
Answer:
1: exothermic
2:hydrated iron (III) oxide
3:reactants
4:precipitate
5: hydrogen gas
Answer:1.exothermic
2.hydrated iron (III) oxide
3.reactants
4.precipitate
5. hydrogen gas
6th edition before we begin, let's first establish an understanding of basic terminology. it may be harder than you think to clearly define what is a chemical versus a chemical reaction. to help us better differentiate between closely related terms, review the words listed here. sort each of the words into the three categories: contains chemicals, chemical reaction, or neither.
Answers
Answer:
Chemicals are substances in any form of matter with a chemical composition and property. Chemical reaction involves the combination of two or more different atoms chemically combined together, which are not easily separated.
Explanation:
CHEMICALS
Vitamin [tex]B_{1}[/tex]proteingraniteorangesCHEMICAL REACTIONS
neutralisationcombustionbleachingphotosynthesisNEITHER
sunlightheatrainbowA chemical equation is balanced when Group of answer choices the number of atoms of each element is the same in reactants and products. the charge on each atom is the same in reactants and products. the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. the total number of ions is the same in reactants and products. the total number of molecules is the same in reactants and products.
Answers
Answer:
a
Explanation:
A chemical equation is said to balanced only when the number of atoms of each element is the same in both reactants and products side. Rest all options are absurd. Hence, option a is correct.
Balancing of the reaction has no relation with coefficient, molecules or charge of the elements
what is mean by stakeholder
Answers
Answer:
a stakeholder is a party that has an interest in a company and can either effect or be affected by the business. the primary stakeholder in a typical corporation are its investors , employees, customers and supplies.It requires work to _____. A. stretch a spring only B. compress a spring only C. stretch or compress a spring
Answers
Answer:
C.
Explanation:
It requires work to stretch or compress a spring.
Answer:the answer is c
Explanation: i say that because with work you can do both of those things
pls balance the following chemical equation asap; Ca(OH)2 +CO2 = CaCO3+ H2O pls make it step by step
Answers
Answer:
Explanation:
Start by writing water as HOH
Ca(OH)2 +CO2 = CaCO3+ HOH
Next pay attention to the CO2 going to CO3
We need an oxygen.
Fortunately that is provided by the (OH)2
Now we have
Ca(OH)2 + CO2 ==> CaCO3 + HOH
and believe it or not, that is balanced as it is
The left side has 1 Ca. So does the right side
The Left side has 1 C. So does the right side.
The left side has 2 H. So does the right side
The left side has 2 oxygens (in Ca(OH2)) + 2 oxygens in CO2
So the equation is balanced.
How many significant figures are in 0.08260 L? 4 5 6
Answers
Answer:
5
Explanation:
Count the digits after the first non zero number, any number after that (even zero) counts.
Hope that helped!!! k
Answer:
[tex]\boxed{4}[/tex]
Explanation:
[tex]\sf Leading \ zeros \ are \ not \ significant.[/tex]
[tex]\sf Trailing \ zeros \ are \ significant.[/tex]
[tex]\sf Non\ zeros \ are \ significant.[/tex]
[tex]0.08260 \sf \ has \ 4 \ significant \ figures.[/tex]
