Answer:
Wrap a magnet in plastic lunch wrap and move it through the mixture of the three solids. The iron filings will stick to the magnet. The filings can be removed by unwrapping the plastic from the magnet carefully! Mix the remaining salt and sand in water and stir.
Explanation:
Please help i don’t understand
Which characteristics of stars is affected by a star's temperature?
Answer:
Characteristics of stars is affected by a star's temperature is Color.
Explanation:
As the color of stars is completely dependent upon its own surface temperature. If the stars are cooler, then it turns red in color. If the stars are hotter, then it turns blue in color.
How can the knowledge of a material’s chemical makeup or use be utilized?
A. To classify minerals
B. To identify minerals
C. To determine the color of the minerals
D. To determine how to break down minerals
To identify minerals
Each material chemical makeup are a variety of chemical compounds which has each own category. They have different functional groups which helps people identify which material they look for. For instance, hydroxyl group has chemical makeup of alcohol
To identify minerals
Explanation:
Each material chemical makeup are a variety of chemical compounds which has each own category. They have different functional groups which helps people identify which material they look for. For instance, hydroxyl group has chemical makeup of alcohol
Select the correct answer. What happens if you double the number of batteries used in a circuit? (Assume all of the batteries are the same.) ОА. . The current doubles only. O B. B. The voltage doubles only. O C. The current decreases. OD. The voltage decreases. O E. The voltage and current doubles.
Answer:
THE ANSWER IS "O E. The voltage and current doubles."
I IT HELPS YOU....
Answer:
They are both doubled, answer E
Explanation:
What is the enthalpy of reaction for the decomposition of calcium carbonate?
CaCO3(s) Right arrow. CaO(s) + CO2(g)
Answer:
Explanation:
You will need to look up the Standard Heats of Formation* for each substance and apply Hess's Law Equation.
ΔH⁰(rxn) = ∑ΔH⁰(Products) - ∑ΔH⁰(Reactants)
*Std Heats of Formation can be found in the appendix of most college chem texts.
For this problem:
Given CaCO₃(s) => CaO(s) + CO₂(g)
∑ΔH⁰: -635.1 Kj/mole -393.5Kj/mole -1206.9
ΔH⁰(rxn) = [(-393.5 Kj/mole) + (-393.5Kj/mole)] - (-1206.9Kj/mole)
= (-635.1 -393.5 + 1206.9) Kj/mole
= +178.3 Kj/mole
Answer:
656.3 kJ
This reaction is endothermic
Explanation:
edge 2020
The two most common isotopes of argon (Ar) are argon-36 and argon-40. Given that the average atomic mass is 39.95, what can be said about the relative abundance of each isotope? Which is more common and how do you know? No calculation is necessary. I am looking for a simple written response.
Answer:
Argon-40
the reason this is abundent is because this is a more common isotope
Explanation:
Is this a model of an element, a compound, or a mixture? Explain your reasoning.
Answer:
A mixture.
Explanation:
The image contains two types of molecules: one with a blue centre and one with a green centre. They are both compounds, as they contain atoms of different elements that are chemically combined/ bonded to each other. As the molecules of the different compounds are not bonded to each other, the model must show a mixture.
A mixture: a combination of molecules of different elements and/or compounds that are not chemically combined e.g. salt dissolved in water.
An element: a substance containing only one kind of atom e.g. oxygen.
A compound: a substance containing two or more kinds of atoms (atoms of different elements) are chemically bonded to each other e.g. water.
In the model of an element, it represents a mixture. The correct option is b.
What is a mixture?A mixture is a non-chemically coupled combination of molecules from different elements and/or compounds, such as salt dissolved in water.
There are two kinds of molecules in the image: one with a blue center and one with a green center. They are both compounds because they contain atoms of different elements that have been chemically combined/bonded. Because the molecules of the various compounds are not bound to one another, the model must depict a mixture.
A compound is a substance that contains two or more types of atoms (atoms of different elements) that are chemically bound to one another, such as water.
Therefore, the model shows a mixture.
To learn more about mixture, refer to the link:
https://brainly.com/question/24898889
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which metal is most likely to form more than one kind of positively charged ion
Answer:
metal atoms lose electrons to form positivity charged ions. non metal atoms gain electrons to form negatively charged ions
How many grams of potassium sulfate should be weighed to prepare 100 ppm of potassium in 250mL of solution if the purity of the salt is 98.7%?
Answer:
R=0.0564g K2SO4
The energy associated with motion is
a. kinetic energy
b. elastic potential energy.
c. gravitational potential energy.
d. nuclear energy
Answer:
Kinetic Energy
Explanation:
The form of energy associated with the motion, position, or shape of an object is called mechanical energy. An object's mechanical energy is a combination of its potential energy and its kinetic energy. The basketball has both potential energy and kinetic energy.
As the vibration of molecules increases, the _____ of the substance increases.
temperature
internal energy
kinetic energy
all of the above
Answer:
Answer option D- all of the above
Where are most of the metals found on the periodic table
Answer:
Left
Explanation:
Metals are located on the left of the periodic table, and nonmetals are located on the upper right. They are separated by a diagonal band of semimetals.
who said
"there are electrons dispersed evenly within a large area of positive material"
A. Rutherford
B. Schrodinger
C. Bohr
D. Thomas
Awnser: The awnser would be (D) Thomas
Explanation:
Use Quizlet
6. Which of the following units would be MOST appropriate for measuring
the length of a car?*
1 poin
A. Millimeters
B. Centimeters
C. Meters
D. Kilometers
7. Which of the following units would be MOST appropriate for measuring
1 point
Answer:
Meter
Explanation:
chemistry question worth 40 points!!
Which of the following is an example of a buoyant force acting on a piece of
bread?
O A. The piece of bread floats on the surface of a lake.
B. The piece of bread travels in uniform circular motion.
C. The piece of bread remains still despite an applied force.
D. The piece of bread travels with straight-line horizontal
acceleration.
An example of the buoyant force on a piece of bread is the piece of bread floats on the surface of body water such as a lake.
What is the buoyant force?This is a force experienced by objects when they are in a body of water. This force implies objects have an upward force, which in many cases causes them to float.
What are some examples of this force?Any object that is submerged in water but floats or shows to have an upward force is an example of this force. Based on this, the option that clearly shows the buoyant force is a bread floating on a lake.
Learn more about buoyant force in: https://brainly.com/question/21990136
Answer:
A
Explanation:
A chemist carefully measures the amount of heat needed to raise the temperature of a 341.0 mg
sample of a pure substance from 8.4 ℃
to 21.5 ℃. The experiment shows that 4.03 J of heat are needed.
- What can the chemist report for the specific heat capacity of the substance?
Answer:
The specific heat of substance is 0.90 j/g.°C.
Explanation:
Given data:
Mass of sample = 341.0 mg (341.0/1000 = 0.341 g)
Initial temperature = 8.4 °C
Final temperature = 21.5 °C
Heat needed = 4.03 J
Specific heat capacity of substance = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
ΔT = 21.5 °C - 8.4 °C
ΔT = 13.1 °C
4.03 J = 0.341 g × c ×13.1 °C
4.03 J = 4.4671 g.°C × c
c = 4.03 J /4.4671 g.°C
c= 0.90 j/g.°C
The specific heat of substance is 0.90 j/g.°C.
Aspirin synthesis involves the addition of an acetyl group to salicylic acid in a condensation reaction with an alcohol. The acetyl group could be added with a carboxylic acid but the preferred procedure is to use the acid anhydride. Why is preferable to use an acid anhydride for ester formation with an alcohol rather than a carboxylic acid? Select one: Carboxylic acids react with water in an undesired side reaction. Acid anhydrides are generally easier and safer to handle than carboxylic acids. Carboxylic acids change the pH of the solution too much for the reaction to proceed. Acid anhydrides are less stable than esters so the equilibrium favors the ester product.
Answer:
The correct appropriate will be Option 1 (Acid anhydrides are less stable than esters so the equilibrium favors the ester product.)
Explanation:
Acid anhydride, instead of just a carboxyl group, is typically favored for esterification. The predominant theory would be that Anhydride acid is somewhat more volatile than acid. This is favored equilibrium changes more toward the right of the whole ester structure. Extremely responsive than carboxylic acid become acid anhydride as well as acyl chloride. Thus, for esterification, individuals were most favored.The other options offered are not relevant to something like the scenario presented. So, the solution here is just the right one.
Common human behavior that seems to be programmed or directed by genes or hormones?
Answer:
There's a lot...lying...rolling eyes...aggression...mating...parenting...sadness...basically alot
Explanation:
What happens to the atomic radius when an electron is gained?
O A. The negative ionic radius is larger than the neutral atomic radius.
O B. The negative ionic radius does not follow a trend with the neutral
radius.
O C. The negative ionic radius is smaller than the neutral atomic radius.
O D. The negative ionic radius is the same size as the neutral atomic
radius.
Answer: A. The negative ionic radius is larger than the neutral atomic radius.
Explanation: Did the test just now
Which of the following is TRUE?
A. Lipids are fatty substances found in the blood.
B. Cholesterol is a type of lipid.
C. Triglycerides is a type of lipid.
D. All of the above
Answer:
The answer is D.
Explanation:
I learned about this last year. Its very simple if you let your parents or teachers explain it to you!
Answer:
All of the above
Explanation:
All the answers are correct. Lipids come in difference forms.
How many atoms of H are in 11 moles of H2O
Answer:
1.325×10²⁵
Explanation:
1 mole of H2O has 2 mole of H atom
11 mole of H20 has 22 mole of H atom
we know
1 mole=6.023×10²³ atom
hence 22mole H =22×6.023×10²³
=1.325×10²⁵
Stereoisomers share the same connectivity and differ only in the way their atoms are arranged in space. Draw the structure of a compound that is a stereoisomer of trans-1,2-dibromocyclobutane.(Note that the question asks for a different stereoisomer of the named compound and not the named compound itself.)Use the wedge/hash bond tools to indicate stereochemistry.Show stereochemistry in a meso compound.In cases where there is more than one answer, just draw one. (use same instructions below)
1b) Draw the structure of a compound that is a stereoisomer of cis-1,2-dimethylcyclopentane.1c) Draw the structure of a compound that is a stereoisomer of cis-1,2-dimethylcyclobutane.
Answer:
Explanation:
A stereoisomer refers to an isomer that shares an identical bonding structure but differs in the geometric position of functional groups and atoms.
Stereoisomers are molecules which have the same semi-expanded formula, but a different arrangement in space.
They are isomers with a similar structural formula, yet which contrast just in their spatial geometry.
From the given question, we are provided with some set of instructions to draw the structure of the following compounds.
stereoisomer of trans-1,2-dibromocyclobutane
cis-1,2-dimethylcyclopentane
cis-1,2-dimethylcyclobutane
The diagram for each compound given can be seen in the attached file below.
Which process occurs in a fission nuclear reactor?
Nuclei combine.
Nuclei split apart.
Neutrons combine.
Neutrons split apart.
Answer:
Nuclear fission/ split apart
Explanation:The process of splitting a nucleus is called nuclear fission and is used in nuclear power reactors. Fission is another word for splitting.
Hope this helps! brainlyeast would only be necessary if this helped you thanks! :) have a good day!
Answer:
The correct answer is B. Nuclei split apart
Explanation:
EDGE2022
this happens in massive star which convert hydrogen into helium?
Answer:
nucleosynthesis. A star's mass determines what other type of nucleosynthesis occurs in its core (or during explosive changes in its life cycle).
A block of metal has a mass of 85g and a volume of 6.35mL. What is the density?
Answer:
13.39
Explanation:
Density is g/mL divide the grams by the mL
What is the freezing point of calcium?
Is calcium brittle?
Does calcium conduct electricity?
PLEASE IF YOU CAN HELP ME OUT AS SOON AS POSSIBLE IT WOULD BE MUCH APPRECIATED!!! THANK YOU!! :)
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Which feature can distinguish between an elemental molecule and a compound molecule?
whether the molecule is formed from at least two atoms
O whether the molecule is formed by the sharing of electrons
O whether the molecule is a gas or a liquid
O whether the molecule is made from different types of atoms
Answer:
whether the molecule is formed from at least two atoms
Explanation:
A feature that distinguishes an elemental molecule and a compound molecule is whether the molecules are formed from at least two atoms.
An elemental molecule is a molecule that contains two or more of the same kind of elements.
A compound molecule contains two or more different kinds of molecules.
An example of elemental molecule is oxygen gas, O₂. An example of a compound molecule is water H₂O.A molecule is a unit of a compound that can represent such a compound.
Therefore, what distinguishes an elemental molecule from a compound molecule is whether a molecule forms from at least two atoms.
What type of energy is elastic energy?
A. Kinetic energy
B. Chemical energy
C. Nuclear energy
D. Potential energy
ASAP
Answer:
D. potential energy
Explanation:
A reaction where heat is added is a(n)
endothermic reaction
heterogeneous reaction
reversible reaction
in endothermic reaction heat is added
