Answer:
lanthanum
Explanation:
lanthanum is an inner transition metal
Mg + H2O → Mg(OH)2 + H2
If the amount of energy required to break bonds in the reactants is more than the amount of energy released in forming bonds in the products, the chemical reaction is endothermic. (2 points) True
Answer:
ummm
Explanation:
im confused can you explain a little bit more
What is the answer to:
5.67 in x 23.321in
Answer:
132.23007
Explanation:
On Saturday mornings, James babysits his nephew Tyler. Tyler is fascinated by meerkats and watches every documentary he can about the animals. Tyler always talks for hours about what meerkats eat, how they live together in families, and how they watch out for predators.
One Saturday, Tyler is very excited. “I told my mom I want a pet meerkat. She said I can’t have one because they’re wild animals. But ferrets are pets and they look a lot like meerkats, so they must be cousins!”
He shows James how similar they look in pictures of a meerkat and a ferret.
Two illustrations with one of a domesticated ferret (Mustela putorius furo) and the second a meerkat (Suricata suricatta) both looking somewhat similar and sitting in the same position.
James searches online and discovers that meerkats and ferrets are not even in the same family. Ferrets are in a family with otters, badgers, weasels, and wolverines. Meerkats are in a different family with mongooses.
If meerkats and ferrets are in different families, why do they look so similar?
A. Species from two different families can be very closely related.
B. Two unrelated species can evolve similar characteristics through convergent evolution.
C. Classification is an evolving process and the two animals are actually in the same family.
D. The two species have the same binomial nomenclature.
B. Two unrelated species can evolve similar characteristics through convergent evolution.
Answer:
B. Two unrelated species can evolve similar characteristics through convergent evolution.
Explanation:
(4.03 Q1) What is a substance which cannot be broken down into different
substances?
an element
a compound
a sugar
Answer:
An element
Elements are substances that cannot be broken down into simpler substances either by physical or chemical method.
Describe what happens to the average speed of the Xe atoms in the container in diagram 3 as the original volume V is reduced to V2 at a constant temperature. Explain.
Answer:
Decreases.
Explanation:
The average speed of the Xe atoms in the container is decreases as the volume of the container is reduced at a constant temperature because there is little space is now available for the movement of Xe atoms so their speed is decreases while on the other hand, if there is more space available for the atoms and they have kinetic energy so their average speed is increases so we can say that volume has a direct effect on the average speed of atoms..
Answer: constant
Explanation:
the temperature did not change just pressure to 2p and volume to v/2. However speed and temp remain same.
3) Calculate the net force *
3N
5N
Answer:
2N
Explanation:
since they are going both sides you subtract
What do you already know about the structure of a water molecule?
Answer:
The key to understanding water's chemical behavior is its molecular structure. A water molecule consists of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, in addition to forming bonds with the hydrogen atoms, also carries two pairs of unshared electrons
Explanation:
Hope it helps
Name 3 parts of an atom
Answer:
the three parts are protons, neutrons, and electrons
Explanation:
have a good day
Which of the following would most likely be spontaneous?
A. A reaction that is more ordered
B. A reaction that is at equilibrium
C. A reaction that requires energy
D. A reaction that produces heat
Answer:
D
Explanation:
i took the test
A reaction which is exothermic and results in an increase in the entropy of the system is said to be always spontaneous. A spontaneous reaction is one that produces heat. The correct option is D.
What is a spontaneous reaction?A process which has an urge or a natural tendency to occur under a given set of conditions is defined as the spontaneous process. Some of the spontaneous process need no initiation, they take by themselves. Dissolution of common salt in water, evaporation, etc. are examples.
Almost all spontaneous process are found to be exothermic. They release heat and warm up their surroundings. These reactions move towards the equilibrium with no need for an energy input from an external source.
Gibbs free energy is an important parameter to determine the spontaneity of a reaction. If the value of ΔG is negative, then the reaction will be spontaneous.
Thus the correct option is D.
To know more about spontaneous process, visit;
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when u get ur answer what type of reaction is it?
-double replacement
-combustion
-synthesis
-decomposition
-single replacement
Answer: combustion reaction
[tex]C_{25}H_{52}+38O_2\rightarrow 25CO_2+26H_2O[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.
The balanced chemical equation is:
[tex]C_{25}H_{52}+38O_2\rightarrow 25CO_2+26H_2O[/tex]
The given reaction is a combustion reaction as in a combustion reaction , a susstaance is oxidized in the presence of oxygen to give carbon dioxide and water.
Write the formulas for the following ionic compounds.
potassium iodide
magnesium phosphide
silver sulphide
iron(III) bromide
magnesium hydroxide
sodium sulphate
lead (IV) nitrate
ammonium carbonate
Answer:
1) KI
2) Mg3P2
3) Ag2S
4) FeBr3
5) Mg(OH)2
6) Na2SO4
7) Pb(NO3)4
8) (NH4)2CO3
How many moles of oxygen are required to use up 2 moles of propane?
Answer:
6.0 moles
Explanation:
The thing to remember about balanced chemical equations is that the stoichiometric coefficients added to each chemical species that takes part in the reaction are equivalent to moles.
I think its 10 moles, hope this helps.
If 5.50 mol of a gas occupies 230 L at constant temperature and pressure, how many moles are there if the volume is decreased to 176 L?
Answer:
4.21 moles are the moles of the gas when the volume decreases
Explanation:
Based on Avogadro's law, the moles of a gas are proportional to its volume under pressure and temperature constants. The formula is:
[tex]\frac{V_1}{n_1} =\frac{V_2}{n_2}[/tex]
Where V₁ is initial volume (230L)
n₁ is initial moles (5.50mol)
V₂ is final pressure (176L)
And n₂ are final moles:
176L * 5.50mol / 230L = n₂ =
4.21 moles are the moles of the gas when the volume decreasesCalculate the equivalent molar concentration of sodium hydroxide if the titration of 20,00 ml of 0,05075 M solution of oxalic acid consumed 19,50 ml of this solution.
Answer:
0.1041 M
Explanation:
The reaction that takes place is:
2NaOH + H₂C₂O₄ → Na₂C₂O₄ + 2H₂OFirst we calculate how many moles of oxalic acid reacted, using the given molarity and concentration:
20.00 mL * 0.05075 M = 1.015 mmol H₂C₂O₄Then we convert H₂C₂O₄ moles to NaOH moles, using the stoichiometric coefficients:
1.015 mmol H₂C₂O₄ * [tex]\frac{2mmolNaOH}{1mmolH_2C_2O_4}[/tex] = 2.03 mmol NaOHFinally we calculate the molarity of the NaOH solution:
2.03 mmol NaOH / 19.50 mL = 0.1041 MAccording to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to
another?
A) The volume and the shape stay the same.
B) The volume increases to fill the new container, but the shape stays the same.
C) The volume stays the same, but the shape changes to fit the new container.
D)The volume and the shape change to fill the new container.
Answer:
C) The volume stays the same, but the shape changes to fit the new container.
Explanation:
26k}+NH4NO3->NH4+NO-3
Answer:
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Please help me ASAP :(
Hydrogen-3 has a half-life of 12.32 years. It decays into helium-3. Suppose a
sample contains 6 atoms of hydrogen-3 and 18 atoms of helium-3. About
how old is the sample?
A. 12.32 years
B. 49.28 years
C. 36.96 years
D. 24.64 years
Answer:
24.64
Explanation:
Just took the test.
Please help!! A 22.4 L Sample of which of the following substances, at STP, would contain Avogadro’s number of particles?
A. Phosphorus B. Mercury C. Nitrogen
Is the ability to burn a physical or chemical property?
Answer: This is the process of chemical change. Examples of chemical properties are flammability (a material's ability to burn in the presence of oxygen) and reactivity (how easily a material combines chemically with other materials).
Explanation: Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter. They include reactivity, flammability, and the ability to rust. ... Flammability is the ability of matter to burn. Burning of wood is a chemical change as new substances which cannot be changed back (e.g. carbon dioxide) are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash. ... Special details which do not change in a substance without new substances being formed are called physical properties.
Answer:
chemical property
Explanation:
Pls help ASAP!!! 70 points for answer
Which of the following is an explanation of how the natural world works, based on experimentation? An analysis A law An opinion A theory
Answer:
A theory
Explanation:
I just need help with question 10.??? Please ASAP
Answer:
4 hydrogen / 1 Carbon
Just look at the diagram
What makes up soil and where do these main components come
from? ASAP
Answer:
Soil is a mixture of minerals, dead and living organisms (organic materials), air, and water.
Explanation:
Dead organisms decompose(kind of like fertilizer)
water comes from nearby watersheds, precipitation processes, etc.
Answer:
Soil is made up of three main components – minerals that come from rocks below or nearby, organic matter which is the remains of plants and animals that use the soil, and the living organisms that reside in the soil. The proportion of each of these is important in determining the type of soil that is present.
You took a summer job at a restaurant. Your boss wants you to mop the bathroom and kitchen floors before you leave tonight. She hands you an unmarked white jug that is filled with a watery clear liquid. What are three things you should do before you mop the floor?
Write the complete electron configurations for
(i) copper
(ii) xenon
Answer:
hello to get it from you and your favouri love your pic
Match the term to its best description.
A. Bond in which one atom is much more
electronegative than the
other
B. Determines what type of
bond will form
Electronegativity
C. A type of covalent bond
D. Positive ion
1. Metallic
2. Ionic
3. Electronegativity
4. Cation
Answer:
A) 2
B) 1
C) 3
D) 4
i hope its right
What must happen for heat to be transferred by convection?
Answer:
D.) The liquid or gas must circulate to move the heat
Explanation:
Describe the relationship between thermal energy and temperature of a substance.
help me pls :D
Please help!
A solution of hydrochloric acid contains
a. fewer hydronium ions than chloride ions
b. fewer hydroxide ions than hydronium ions
c. more hydronium ions than chloride ions
d. more hydroxide ions than hydronium ions
Answer:
c)
more hydronium ions than chloride ions
Suppose you found this bright purple mineral how would you describe its luster
Answer:
mineral
Explanation: