Answer:
8 hcl and h2 is reactants.
Why are milk powder tins and salmon tins coated with tin (Sn) metal? Give reasons based on the reactivity series of the metals.
Urgent!!
Changing a chemical property of a substance
never alters its chemical composition.
always alters its chemical composition.
will only alter its chemical composition if the change is small.
will only alter its chemical composition if the change is large.
Answer:
A chemical change in a substances always alters the chemical composition.
Explanation:
Molecules always are combined to create a new substance, otherwise it would only be a physical change and the substance would have still had the same molecular design.
The variables for this experiment include mass, volume, and the materials in the various balls, as well as their densities. Part I, you will be comparing a table tennis ball and a golf ball. Use the drop-down menus to complete the sentences and identify the independent and dependent variables. In Part I, the independent variable, the one that is intentionally manipulated, is .
In Part I, the dependent variable, the one that you measure the response in, is .
Answer: A. Mass B. Density
Explanation:
Answer:
A, mass. B density
Explanation:
because yes, and yes. also the person above me is correct have a good day
The chemical formula for glucose, a type of sugar, is C6 H12 06. Which statement is true about glucose?
1) Glucose is a compound because it's made from more than 1 element 2) Glucose is an element because it's made up from more than one kind of atom. 3) Glucose is an element because it can be separated. 4) glucose is a compound because is made of protons, neutrons and electrons
The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
What is an Element ?An element made entirely of one species of atoms, or an element, has a specific number of protons in its nucleus.
Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
Three substances make up glucose: carbon, hydrogen, and oxygen. They are set at a fixed ratio of 1:2:1.
Covalent bonds, in which two atoms share bonding valence electrons in one or more bonds, are used to bind these atoms together.
Therefore, The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
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Which structure captures and stores the sun's energy in plant cells?
Choose the correct answer.
O chloroplast
O mitochondria
O Golgi apparatus
endoplasmic reticulum
Pls hurry
Answer:
chloroplast
Explanation:
How would you describe the mood in the section nose to the ground?
Answer:
The mood of the section “Nose to the Ground” could be described as suspenseful.
Explanation:
When dissolved beryllium chloride reacts with dissolved silver nitrate in water, aqueous beryllium nitrate and silver chloride powder are made . What’s the equation . I will give Brainliest for the right answer
Answer:
Please mark as Brainliest!!!!!!!
Explanation:
A solution can be made when a-
A.solid dissolves in a liquid
B.solid dissolves in a solid
C. liquids dissolve in liquids
D. all of the above
Answer:
c. liqids dissolve in a liquid.
Explanation:
Answer:
I think it's D
Explanation:
HURRY NEED ANSER NOW!!!
A machine makes work easier by____
A. Multiplying the force exerted
B. Maintaining the distance over which the force is exerted
C. Adding the forces exerted
D. Dividing the force exerted
Answer:
your answer would be C.
Explanation:
Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. sorry if im wrong.
2. Which statement is true about all metals?
A. They have one valence electron.
B. They have freely moving electrons.
C. They have more electrons than protons.
D. They always gain electrons.
Answer:
they have freely moving electrons
Answer:
Explanation:
a) 1/2 true: The Alkali metal group has one valence electron but Earth metals have two valence electrons.
b;) true Metals are good conductors because they have many free electrons.
c:)a negative ion has more electrons than protons
d;) metals lose electrons and non-metals gain electrons. metals transfer electrons to nonmetals.
I think B is your best answer.
What is the correct electronic configuration for I?
Answer: [Kr] 4d10 5s2 5p5
mixing chocolate syrup into milk
picking up a paper clip with a magnet
Mass or state
compared to nonmetals, metals tend to have-
A. higher ionization energy
B. an acidic form of oxide
C. lower electronegativity
D. higher electron shielding
Answer:
C. Lower Electronegativity
Periodic table is divided into metals, non metals, semiconductors and noble gases on the basis of electron gain or loss. Metals have lower electronegativity. The correct options is option C.
What is metal?Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.
Lets take properties
1.Since metals have free electrons that's why they can conduct electricity.
2. Since atoms in metals are very closely packed in a definite crystal so these are solid. Metals are not brittle that is, it can not be broken down easily
3.Metals do not react with water easily.
4.Metals are denser than water hence sink in water.
5. Metals are meant to give electrons so these have low ionization energy. and lower electronegativity.
6. Metals form basic form of oxide.
7. Metals have lower electron shielding.
Therefore the correct options is option C.
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Arrange the electrons in the sulfur atom in the orbital diagram. Use the periodic table to determine the number of electrons for sulfur. Drag each image to the correct location on the diagram. Each image can be used more than once.
Answer: 1s= 11
2s=11 2p= 11,11,11
3s=11 3p=11,1,1
Explanation:
The statement, that describes the electrons in the sulfur atom in the orbital diagram is "[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}[/tex]"
What is electrons?Electron can be referred as subatomic particle containing negative charge on it.
What is an orbital diagram?Orbital diagrams are graphical representations of electrons in an atom. Three rules can be used to create orbital diagrams. Each electron, according to the Aufbau Principle, occupies the lowest energy orbital. According to the Pauli Exclusion Principle, only two electrons can fit into a single orbital.
According to Hund's' rule, electrons enter distinct orbitals within the same sub-level before doubling up inside orbitals. A Sulphur atom is a neutral atom with the atomic number of 16, implying that it possesses a total of 16 electrons. According to the Aufbau rule, electrons will be put into the 1s orbital first, then the 2s, then the 2p, and so on. Because the s subshell can only accommodate two electrons, the first two electrons in the Sulfur electron configuration will go in the 1s orbital.The next two electrons will enter the 2s orbital, followed by the following six electrons, which will enter the 2p orbital because the p subshell can store up to six electrons. The following two electrons will enter the 3s orbital, and the final four electrons will enter the 3p orbital. As an outcome, the Sulphur electron configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}[/tex]
Hence the correct answer is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}[/tex].
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Which energy transformations best describe a wildfire?
а
b
ОООО
Kinetic Energy -> Thermal Energy ->Chemical Potential Energy-> Light Energy
Chemical Potential Energy -> Thermal Energy -> Light Energy
Chemical Potential Energy -> Thermal Energy -> Light Energy -> Sound Energy
Thermal Energy -> Chemical Potential Energy->Light Energy -> Sound Energy
C с
Answer:
3
Explanation:
1) Determine the grams of phosphate in 0.430 g potassium dihydrogen phosphate and show that the resulting solution when 0.430 g potassium dihydrogen phosphate is dissolved in 100 ml (100 g) water is 3000 ppm (3000 mg/L) in PO43–.
Answer:
3000ppm of PO₄³⁻
Explanation:
First, we need to calculate the moles of potassium dihydrogen phosphate, KH₂PO₄. These moles are equal to moles of phosphate, PO₄³⁻:
Moles KH₂PO₄ -Molar mass: 136.086g/mol-:
0.430g KH₂PO₄ * (1mol / 136.086g) = 3.16x10⁻³moles KH₂PO₄ = Moles PO₄³⁻.
Now, mass of PO₄³⁻ is:
Mass PO₄³⁻ -molar mass: 94.97g/mol:
3.16x10⁻³moles PO₄³⁻ * (94.97g / 1mol) = 0.300g of PO₄³⁻ = 300mg
In 100mL = 0.100L
300mg PO₄³⁻ / 0.100L =
3000ppm of PO₄³⁻0.430 g of KH₂PO₄ contain 0.300 g of PO₄³⁻. When dissolved in 100 mL of water, the resulting solution is 3000 ppm in PO₄³⁻.
We want to calculate the mass of PO₄³⁻ in 0.430 g of KH₂PO₄.
We know that:
The molar mass of PO₄³⁻ is 94.97 g/mol.The molar mass of KH₂PO₄ is 136.08 g/mol.The mass ratio of PO₄³⁻ to KH₂PO₄ is 94.97:136.08.0.430 g KH₂PO₄ × (94.97 g PO₄³⁻/136.08 g KH₂PO₄) = 0.300 g PO₄³⁻
When 0.300 g (300. mg) of PO₄³⁻ are dissolved in 100 mL of water, the resulting concentration, in ppm, is:
300. mg/0.100 L = 3000 ppm
0.430 g of KH₂PO₄ contain 0.300 g of PO₄³⁻. When dissolved in 100 mL of water, the resulting solution is 3000 ppm in PO₄³⁻.
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A sample of nitrogen has a volume of 880. mL and a pressure of 720. torr. What pressure will change the volume to
.672L if the temperature is held constant?
Answer:
943torr
Explanation:
according to Boyles law
P1V1=P2V2
however V2 = .672L
convert into mL
.672× 1000
672mL
880(720)=672P2
633600= 672P2
633600÷672=P2
943.0torr=P2
Fluorine 19 has an atomic number of 9 and a mass number of 19 How many neutrons does an atom of fluorine 19 contain ?
Answer:
10
Explanation:
Atomic mass subtracted by the atomic number to get your answer
An actual measurement of a sample is 3.5m. The measured value is 2.5m.
Percent error? *
URGENT
Answer:
The answer is 28.57 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
actual measurement = 3.5 m
error = 3.5 - 2.5 = 1
We have
[tex]p(\%) = \frac{1}{3.5} \times 100 \\ = 28.571428...[/tex]
We have the final answer as
28.57 %Hope this helps you
1. The temperature of a sample of nitrogen
gas is a measure of the molecules' average
(1) activation energy
(2) potential energy
(3) kinetic energy
(4) ionization energy
1
Answer:
(3) kinetic energy
Explanation:
The temperature of a sample of nitrogen gas is a measure of the molecules' average kinetic energy. This is one of the postulate of the kinetic theory of gases.
A gas is composed of a large number of identical molecules moving at different speeds. The space occupied by the gas molecules themselves are negligible compared to the volume of the space they occupy. The molecules are independent of one anotherThe molecules collide with one another and with the walls of the container. The temperature of the gas is a measure of the average kinetic energy of the molecules.The temperature of a sample is a measure of the molecules' average
kinetic energy.
Increase in the temperature of a sample increases the degree of
randomliness and elastic collision of its atoms. We can define kinetic
energy as the type of energy as a result of its motion. Gas have more
kinetic energy as a result of it having the highest temperature while solids
have the lowest.
This explains why temperature is the measure of the average kinetic
energy of an object.
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What is the difference between the interaction of matter in a compound and the interaction of matter in a mixture?
Answer:
Matter in compound having chemical bonds while in mixture matter have physical interaction.
Explanation:
We know that element is a substance that is made up of atoms. The atoms of different elements combine to form compound. These are the form of matter that have characteristic properties and having fixed chemical composition. The atoms of different elements are combine to gather through the chemical bond.
For example:
Consider the compound water. It has hydrogen and oxygen. Atoms are bonded together through chemical bond and having fixed proportion. So we can say that their interaction is chemical interaction.
While in mixture different matter combined through the physical interaction.
Atoms of different elements are not chemically bonded together.
For example:
Mixture of sand and water.
Mixture of oil and water.
5. A shopping mall wanted to determine whether the more expensive
"Tough Stuff" floor wax was better than the cheaper "Steel Seal" floor wax
at protecting its floor tiles against scratches. One liter of each brand of
floor wax was applied to test sections of the main hall of the mall. The test
sections were all the same size and were covered with the same kind of
tiles. After 3 weeks, the number of scratches in each of the test sections
was counted to observe the wax's effectiveness. Identify Control Group
Answer:
Control group:
Test section covered with the "Steel Seal" floor wax
Explanation:
In a scientific experiment, the control group is the standard group to which comparison is made, to determine the effect of the experimental agent on the test subjects. In this example, the Steal Seal floor wax is the standard wax being used, and the experimenter wants to see if the "Tough Stuff" wax is better, hence after the treatment with the Tough Stuff wax, the number of scratches observed is compared with the standard wax area and the difference determines if it is a better waxing agent or not.
Were new substances created from old substances during electrolysis? Explain.
NEED HELP PLEASE ANSWER Which of the following statements is true?
Rocks usually absorb heat evenly.
Water expands when it freezes.
Caves are formed through oxidation.
The movement of sediment is called weathering.
Answer:
water expands when it freezes
Explanation:
Answer:
B. Water expands when it freezes.
Explanation:
Part B: Short Answer - Answer the following questions
6. Why are the elements so important?
7. The transition metal Cobalt has an atomic number of 27 and an atomic mass of approximately 59
AMU. How many neutrons does it have? Show all your calculations for full marks.
I
28
tv
I need help fast 50 points
Answer:
7. 32neutrons
Explanation:
mass number is equal to number of protons plus the number of neutrons
the atomic number is also known as the number of protons
therefore 59-27=32
please help!! im taking the test now
Which lists the elements in order from least conductive to most conductive?
A. nitrogen (N), antimony (Sb), bismuth (Bi)
B. nitrogen (N), bismuth (Bi), antimony (Sb)
C. antimony (Sb), nitrogen (N), bismuth (Bi)
D. bismuth (Bi), antimony (Sb), nitrogen (N)
Answer:
b
Explanation:
Answer: nitrogen (N), antimony (Sb), bismuth (BI)
Explanation:
The elements listed belongs to Group V on the periodic table.
Ok so now I have to wright an essay about microorganisms what should I wright it about?
Answer:
Maybe Write about the meaning and causes?
Explanation:
:)
How many atoms are in 3.5 moles of carbon?
Answer:
Explanation: There are 5.418⋅1024 atoms in 3 moles of Carbon Dioxide. Explanation: 1 Mole is 6.02⋅1023 molecules. Therefore 3 Moles of Carbon ...
As in 1 mole there are 6.022 * 10^23 atoms.
So in 3.5 mole of carbon there are 21.077 * 10^23 atoms.
What do we should know about mole concept?
The mole concept is a convenient way to describe a substance's volume. The numerical magnitude and the units in which it is expressed are the two components of any measurement. When a ball's mass is measured to be 2 kilograms, for instance, the magnitude is "2" and the unit is "kilogram."Even one gram of a pure element contains a significant number of atoms when dealing with particles at the atomic (or molecular) level. The mole concept is frequently used in this context. It focuses primarily on the "mole" measurement, which represents a count of a very large number of particles.A mole is the amount of a substance that contains precisely 6.02214076 * 10^23 "elementary entities" of the given substance, as defined in the field of chemistry.Every substance has the same number of atoms or other particles in a mole. The mole and an element's mass are related in the following ways. There are 6.02214076 * 10^23 carbon-12 atoms in one mole, giving it a mass of 12 grams. By definition, one mole of oxygen has the same number of atoms as one mole of carbon-12, but it weighs 15.999 grams. As a result, oxygen has more mass than carbon. Weights of molecules or formulas can be accounted for using this logic as well.
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which city is most likely experiencing sunny weather due to e high pressure system A- raleigh , B- new york ,C - little rock, D- santa fe
Answer:
a
Explanation:
Comparing Protists and Prokaryotes
Which statement correctly compares protists to prokaryotes?
The cells of protists and prokaryotes contain nuclei.
The cells of protists have cell walls, but prokaryotes do not.
Both protists and prokaryotes are multicellular.
Most protists and all prokaryotes are unicellular.
.Answer: Physically, the cell structure of protists and prokaryotes differ. First, the external structures of prokaryotes consist of cell walls made of peptodoglycan. Protists do not have a cell wall, and instead have a semi-permeable plasma membrane in the form of a phospholipid bilayer
Explanation: 1 - Most of the and all Prokaryotes are unicellular organisms. 2- Prokaryotes lack a proper nucleus and other membrane-bounded organelles while have membrane-bounded nuclei and other organelles.
Answer:
its D
Explanation:
I took the assignment on edg