Which properties change the composition of a substance?
A. Chemical Properties.
B. Physical properties
C. Chemical and physical properties
D. Neither chemical nor physical
Please help.
Cobalt, a transition metal, forms both the Co2+ and Co3+ ions. Which of the following are the correct formulas and names for the oxides formed by the two different ions? (You’ll have to choose more than one)
a) CoO3, cobalt(III) oxide
b) CoO3, cobalt(II) oxide
c) Co2O3, cobalt(III) oxide
d) CoO3, cobalt(II) oxide
e) CoO3, cobalt(III) trioxide
f) CoO, cobalt(II) oxide
g) Co2O, cobalt(II) oxide
h) Co2O, cobalt(III) oxide
Well to solve this problem, we must remember that Oxygen in ionic form is Oxide O2- (an electric charge of negative 2). Hence the correct formulas and names taking into account the charge of Oxygen are:
c) Co2O3, cobalt(III) oxide
f) CoO, cobalt(II) oxide
The correct formulas and names for the oxides of cobalt are CoO, cobalt(II) oxide and Co2O3, cobalt(III) oxide based on the different oxidation states of Cobalt ions.
Explanation:The correct formulas and names for the oxides formed by cobalt's two different ions, Co2+ and Co3+, are CoO, cobalt(II) oxide and Co2O3, cobalt(III) oxide.
These names are determined by the oxidation state of the cobalt ion in the compound. For cobalt(II), the oxidation state is +2, which when combined with the -2 charge from the single oxygen atom, gives a neutral compound of CoO. For cobalt(III), the oxidation state is +3, which with the -2 charge from each of the three oxygen atoms, again gives a neutral compound - this time of Co2O3.
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paleomagnetic evidence was used to confirm which of the following hypotheses?
a. hot spot
b. transformation boundaries
c. seafloor spreading
d. subduction
Answer;
C. seafloor spreading
Explanation;
The theory of seafloor spreading states that new ocean crust is continually being formed, and that this crust is slowly carried away from its point of origin over a period of time.
Paleomagnetism helped explain an unusual observation from the 1950s. Magnetic studies revealed that the ocean floor was comprised of parallel bands of crust having alternating magnetic polarity.These magnetic bands were symmetric about the mid-oceanic ridge.
Which of the following statements about the periodic table's organization is true? (Select all that apply.)
It is organized by reactivity.
It is organized by families.
It is organized by atomic number.
It is organized by atomic mass.
It is organized by periods and groups.
What is the most accurate description of compounds?
What is the third ionization energy of titanium?
Metals are supposed to give electron easily so their ionization energy is low as compared to metals. Third ionization energy of Titanium is 2652.5KJ/mole
What is ionization energy?Ionization energy is the amount of energy that is required to take out the electron from the outermost shell of an atom. Since energy is given to the element, process is endothermic and the given energy is positive
Ti belongs to D block of periodic table. It is metal so its ionization energy will be not so high as metals release electron very easily.
Electronic configuration of Titanium is [Ar]3d²4s²
The first ionization energy is [Ar]3d²4s¹
The second ionization energy is [Ar]3d²
The third ionization energy is [Ar]3d1
Thus value of third ionization energy comes out to be 2652.5KJ/mole
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Calculate the mass of 4.50 moles of Ca3(PO3)4
Answer: 1962.513u
Explanation:
Ca3(PO3)4
Ca = 40.078u
P = 30.97u
O = 16u
1 mole of Ca3(PO3)4 =(3*40.078) + 4[(16*3) + 30.97]
1 mole = 120.234 + 315.88 = 436.114g/mol
If 1 mole = 436.114g/mole
4.5 mole = x?
Cross multiply and make x the subject,
x = 4.5*436.114/1
= 1962.513g/mol
Therefore, 4.5 moles of Ca(PO3)4 equals 1962.513g/mole
The independent variables, the ones that are intentionally manipulated, are ____
A. temperature, acidity, surface area, and percentage of mass remaining.
B. temperature, acidity, mineral composition and surface area
C. acidity, mineral composition, percentage of mass remaining and temperature
D. acidity, mineral composition, temperature, and percentage of mass remaining.
15 points! I have until 4:00 pm
Answer: B. temperature, acidity, mineral composition and surface area
Independent variables are those which can be changed and manipulated in the experiment the effect of which can be observed on the changes that occur in the dependent variable. For example the effect of quantity of manure and water on the height of the plant. Here, quantity of manure and water are the independent variables and the height is the dependent variable.
The temperature is the independent variable because the level of temperature can be increased or lowered down manually.
The acidity is the independent variable because the acidity can be manipulated by addition of chemicals that exhibit more hydrogen ions.
Mineral composition can be manipulated and it is an independent variable by treating a mineral with a suitable chemical this will bring a change in the chemical composition of the mineral.
Surface area is the independent variable because it is the total area required for the conduction of the experiment . The surface area can be increased or decreased.
How many days have passed if 4.80 mg of calcium-47 decayed to 1.2 mg of calcium-47?
The question refers to nuclear physics and can be interpreted using the concept of half-life. In the given scenario, three half-lives have passed in the decay of calcium-47 from 4.80 mg to 1.2 mg. Therefore, the time passed is three times the half-life of calcium-47.
Explanation:This question can be solved using the concept of half-life, which is widely used in nuclear physics and radioactive decay calculations. Since the half-life represents the time taken for half of a substance to decay, you can use the known half-life of Calcium-47, if provided, to figure out the time that has passed. Given we started with 4.80 mg and are left with 1.2 mg of Calcium-47 implies three half-lives have passed (as 4.80 mg to 2.4 mg is one half-life, 2.4 mg to 1.2 mg is a second half-life and finally 1.2 mg to 0.6 mg is the third half-life). Therefore, the time elapsed is equal to three times the half-life.
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calculate the number of moles in 64.1 g of Al
Sketch space-filling models of a hydrogen molecule (H2) and carbon dioxide (CO2)..
A sample containing 0.213g Cl- is dissolved in 50.0ml of water how many moles of Cl- are in the solution?
Answer:
There are 0.006 moles of Cl- in the solution.
Explanation:
To solve this problem you should think in te concept of molar mass, the molar mass of Cl- is 35.45 grs/mol (it has the same mass as Cl, because electrons doesn´t contribute with significant mass). So,
35.45 grs --------- 1 mol Cl-
0.213 grs --------- x = 0.006 moles Cl-
There are 0.006 moles of Cl- in the solution.
a hotdog is matter but the heat that cooks it Is?
The total potential and kinetic energy of an object is called
What is the limiting reactant when 6.8 moles of iron react with 8.9 moles of oxygen gas?
Unbalanced equation: Fe + O2 → Fe2O3
4Fe + 3O2 → 2Fe2O3
observe that you were given the amounts of each substance in moles
For the equation 3 H2SO4 + 2 Al —> 3 H2 + Al2(SO4)3 , suppose you wish to prepare 28.7 grams of H2. How many grams of H2SO4 and of Al would you require so that all of the H2SO4 and Al were combined?
Final answer:
To produce 28.7 grams of H₂, 1394.26 grams of H₂SO4 and 255.6 grams of Al are required, based on the stoichiometry of the balanced chemical equation.
Explanation:
To determine the amounts of H₂SO4 and Al needed to produce 28.7 grams of H₂, we start with the balanced chemical equation: 2 Al + 3 H₂SO4 → Al₂(SO4)₃ + 3 H₂.
First, we calculate the moles of H₂ produced using its molar mass (2.02 g/mol). For 28.7 grams of H₂, that's 28.7g / 2.02 g/mol = 14.21 mol of H₂. Based on the reaction stoichiometry, for every 3 moles of H₂ produced, 3 moles of H₂SO4 are needed, and 2 moles of Al are required.
Therefore, we require 14.21 mol of H₂SO4 and 9.47 mol of Al. The molar mass of H₂SO4 is 98.09 g/mol, so we need 14.21 mol × 98.09 g/mol = 1394.26 grams of H₂SO4.
The molar mass of Al is 26.98 g/mol, hence 9.47 mol × 26.98 g/mol = 255.6 grams of Al.
Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume? gas liquid plasma solid
solid
extra charecters cuz i need them
An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of _____ amu. (Enter a whole number.)
Answer : An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of 13 amu.
Explanation :
As we are give that,
Number of protons = 7
Number of electrons = 7
Number of neutrons = 6
As we know that,
Atomic number =Number of protons = Number of electrons = 7
Atomic mass = Number of neutrons + Atomic number
Atomic mass = 6 + 7 = 13 amu
Therefore, the atomic mass is, 13 amu
Bromine (Br) is a halogen.
Given the information in the statement, what can be inferred as true about bromine?
Bromine does not react easily with other atoms.
Bromine tends to form anions when in chemical reactions with metals.
Bromine has seven electrons and seven protons.
Bromine tends to form covalent bonds when in chemical reactions with metals.
The atomic symbols of nitrogen and oxygen are N and O, respectively. The chemical formula of a particular substance is NO2. Which of the following is a correct description of the substance?
A.
a compound made up of 2 nitrogen atoms and 2 oxygen atoms
B.
an element made up of 2 nitrogen atoms and 2 oxygen atoms
C.
a compound made up of 1 nitrogen atom and 2 oxygen atoms
D.
an element made up of 1 nitrogen atom and 1 oxygen atom
Answer:
The correct answer is option C.
Explanation:
Atomic symbol of nitrogen = N
Atomic symbol of oxygen = O
In the chemical formula = [tex]NO_2[/tex]
The given molecular formula of compound indicate its one molecule is made up of 1 nitrogen atom and 2 oxygen atoms.
how do the leathery pads on the bottom of camel's feet help a camel? It is for a web quest thing
What does the law say about energy?
What about energy can change and what does not change, according to the law?
Final answer:
The Law of Conservation of Energy states that energy cannot be created or destroyed but can only change form. This law is fundamental to understanding the behavior of energy in various systems.
Explanation:
The question pertains to the basic laws that govern energy behavior in physics. The main law that defines what happens to energy is known as the Law of Conservation of Energy. This pivotal law asserts that energy cannot be created or destroyed, but can only change from one form to another.
For instance, electrical energy can be converted into thermal energy, kinetic energy can be transformed into potential energy, and so forth.
In a physical process, energy may seem to 'disappear' as it changes form, such as when friction converts kinetic energy into heat energy that is dispersed into the environment. However, the total energy before and after the process remains the same, affirming that energy is conserved.
Furthermore, looking at the broader perspective, the energy within a closed system remains constant over time. The only changes that occur are the forms of energy; for example, within an ecosystem, the chemical energy in food is converted into kinetic energy by animals, and ultimately into heat energy when it is used by organisms.
Ultimately, energy might leave the planet in the form of heat radiating into space, but overall, it stays within the Earth-sun system, converting and moving from one place to another.
if i have 1 full shell of electrons and 2 in the outer shell,what element am i
To treat certain forms of cancer, physicians may choose to irradiate the body with high-energy radiation. Why does this therapy work?
Please help!
What do earth scientists study? What are some areas that they investigate? What kinds of questions do they ask? Why is it important to study earth science?
Earth scientists study the physical aspects, processes, and history of the Earth through disciplines like geology, oceanography, meteorology, environmental science, and even astronomy. They address important questions regarding natural resources, geological hazards, and environmental impacts. The study of Earth science is crucial for understanding climate change, managing natural disasters, and guiding the sustainable use of resources.
What Do Earth Scientists Study?
Earth scientists are concerned with understanding the various aspects of the Earth and its processes. They investigate fields such as geology, which is the study of Earth's material and structures, oceanography, focusing on the oceans, and meteorology, which deals with the atmosphere, climate, and weather. Additionally, environmental science looks at the effects of human activities on the environment, and astronomy extends beyond Earth to study the solar system, galaxy, and universe.
Relevant Questions in Earth Science
Earth scientists ask a variety of critical questions, such as how do geological events like earthquakes and volcanoes impact human society? What can the rock cycle tell us about Earth materials? They also explore how climate is changing and the mechanisms of seismic activity. Their work can involve developing models to understand Earth's processes and determining geologic time through the analysis of rock formations.
Importance of Studying Earth Science
Studying Earth Science is vital for several reasons: to satisfy human curiosity, understand the evolution of life, search for resources, assess geological hazard risks, and analyze past environmental and climate changes to understand current human impacts. Furthermore, insights from Earth science are indispensable for addressing some of the biggest problems we face today, such as climate change, natural disasters, and the sustainable management of natural resources.
Interdisciplinary Connections
Earth science is inherently interdisciplinary, connecting with other fields such as biology, physics, chemistry, and various societal domains. Collaboration with these disciplines helps Earth scientists to deepen their understanding and address complex challenges.
Consider the following representation where A and B are reactants.
A + B  products
Which rate law correctly applies to this reaction?
k[A]
k[AB]
k[B]
k[A][B]
Help me
Which picture shows straining
I think it's B F D
Which picture shows filter paper being used I think C
Which picture shows pieces of iron being separated I think E
Which picture show dissolving I think A which picture shows evaporation I think D CAN YOU CHECK IF IM RIGHT PLEASEWEEEEE I ONLY HAVE 8 minutes until the bus comesss sooo hurryyyrrrr
Answer:
Figure A depicts dissolution, B and F depict straining. Figure C depicts the use of filter paper. Figure D shows the evaporation process. Figure E shows separation with the help of a magnet.
Explanation:
The techniques mentioned in the images are separation techniques.
Straining is the separation process in which the particles are separated on the basis of size with the help of a filter. The filter will set the cut-off value and the particles are separated.
In Figure B with the help of a strainer, the water from the spaghetti is removed. So figure B possesses straining.
In figure F the tea leaves are separated from the tea with a strainer. Thus Figure F also depicts the straining technique.
The use of filter paper is made to differentiate the particles of very small size. In figure C, filter paper is used to separate the solute in the solution.
The separation of iron is made with the use of a magnet. Magnet has the ability to attract iron towards it.
In figure E, iron nails are being separated with the help of a magnet.
Dissolving is the process of making two solutes miscible in a solution. In figure A, sugar was made to dissolve in water making a miscible solution. Sand is allowed to dissolve in water making an immiscible solution.
Evaporation is the process of converting liquid to vapor form.
Figure D posses the evaporation process in which water is evaporated in the form of vapor, leaving the salt behind.
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Which of the following is a possible formula unit?
CaK2
BF3
Br2O
K2Cl
The answer is AlF3. Hopes this helps.
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how does a substances temperature change when the average kinetic energy of its particles increases and they decrease
Which option gives two examples of clastic sedimentary rock?
Limestone and Sandstone
Coquina and Shale
Coquina and Limestone
Shale and Sandstone
It is Shale And Sandstone
The options that give two examples of clastic sedimentary rock are Shale and Sandstone. The correct option is D.
What is a sedimentary rock?Sedimentary rocks are those rocks that are formed by the accumulation of minerals and organic particles at the surface of the earth. These rocks are made by the heat and pressure of the earth, which convert the organic material and minerals into rocks.
There are different types of sedimentary rocks. These are sandstone, limestone, and shale. They are mainly formed by the accumulation of minerals from rivers.
Clastic sedimentary rock is formed by fragments or pieces of sedimentary rocks. These are formed when the pieces are broken or fragmented by forces and are present in the basin of the earth's surface.
Thus, the correct option is D. Shale and Sandstone.
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