PLEASE HELP!!!
A piece of wood has a mass of 2.85 g; when placed in 20.0 mL of water, the water volume increased to 23.4 mL. What is the density of this piece of wood?
_______ Answer _______Units
Answer:
d = 0.84 g/cm³
Explanation:
Given data:
Mass of wood = 2.85 g
Volume of water = 20.0 mL
Volume of water + wood = 23.4 mL
Density of wood = ?
Solution:
Volume of wood = (Volume of water + wood ) - Volume of water
Volume of wood = 23.4 mL - 20.0 mL
Volume of wood = 3.4 mL
1 mL = 1 cm³
Density of wood:
d = m/v
d = 2.85 g / 3.4cm³
d = 0.84 g/cm³
The presence of which ion usually produces a colored solution? A. K+
B. F-
C. Fe2+
D. S2-
The presence of which Fe²⁺ ion usually produces a colored solution. Therefore, option C is correct.
What is an ion?An ion can be described as a chemical specie that exhibited a positive or negative charge. The term ‘ion’ can be referred to atoms or molecules with non-zero charges on them. Therefore, all atoms have more electrons than protons or more protons than electrons.
If the number of protons in atomic structure is greater than electrons are termed to hold a net positive charge and are referred to as cations. The ions that contain a greater number of electrons than protons in atomic structure hold a net negative charge are anions.
The electronic configuration of the iron is [Ar]3d⁶4s². As the iron atom losses 2 electrons in its valence shell, it becomes a cation Fe²⁺ ion. As it has four unpaired electrons produces a colored solution.
Learn more about an ion, here:
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Answer only if you
had/have braces how long did it take to notice change with your braces on
Answer:
about 2 years I think, you might have to ask your dentist
Explanation:
Answer:
it really depens of ur treatment i had braces and it took a year and now i got them again and they say its gonna take a year so it depends on ur treatment
Explanation:
On the periodic table, periods are elements with similar
O Atomic Number
O Atomic properties
O Atomic Mass
O None of the Above
Answer:
B.) Atomic Properties
can I have brainliest?
[tex]Have\\a\\nice\\day[/tex]
how many moles of oxygen in 36.55 grams of CO2
Answer:
1.66 moles of oxygen
Explanation:
Given data:
Mass of CO₂ = 36.55 g
Number of moles of O = ?
Solution:
Number of moles of CO₂ = mass/molar mass
Molar mass of CO₂ is 44 g/mol
Number of moles = 36.55 g/ 44 g/mol
Number of moles = 0.83 mol
1 mole of CO₂ contain 2 moles of oxygen.
0.83 × 2 = 1.66 moles of oxygen
The nucleus of an atom is made up of a dense ball
of_________and_____________surrounded by________.
Answer:
The nucleus of an atom is made up of a dense ball
of protons and neutrons surrounded by electrons.
Explanation:
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.
Below are models of two types of cells. Which of the following structures 2 points
are common to both cell types?
A. mitochondria and vacuoles
B. mitochondria and cell wall
C. vacuoles and chloroplasts
D. cell wall and chloroplasts
Answer:
D is the right answer cell wall and chloroplasts
Answer:D
Explanation: Because you know what each cell looks like
the importance of reproduction??
Answer:
The main significance of reproduction is to maintain continuity of species. It also helps in studying evolution as sexual reproduction results in variation among the species.!!please help asap ty only if you can ty!!!
2. How many atoms of zinc are present in 0.48 mol of zinc?
(show solution)
Answer:
2.89 × 10²³ atoms of zincExplanation:
The number of atoms of zinc can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.48 × 6.02 × 10²³
We have the final answer as
2.89 × 10²³ atoms of zincHope this helps you
Answer:
2.89× 10²³ atom
Explanation:
Given data:
Number of atoms of Zn = ?
Number of moles of Zn = 0.48 mol
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole = 6.022 × 10²³ atom
0.48 mol × 6.022 × 10²³ atom / 1mol
2.89× 10²³ atom
Why it is important to replicate scientific experiments?
to detect mistakes
to confirm findings
to introduce more variables
to produce more trials with data
Its A CUHH!!!!!!
WHY???- BC I SAID SO CUHH
3 examples of density synonyms
frequency.
quantity.
thickness.
body.
closeness.
concretion.
heaviness.
solidity.
Can scientists determine a more precise age of this snail fossil?
Answer:
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.
Explanation:
Answer:
mark the other person brainliest
Explanation:
Why are the magnetic field lines closest together at the poles?
Help me with this....
Answer:
1,3,4
Explanation:
Because you have to know what each one is
Rosa is breathing normally and eats a peanut butter sandwich for lunch. Peanut butter contains a lot of protein, and bread is mostly starch. Rosa plans to go for a run later this afternoon.
What does she need from the food she ate and the air she breathes so that she can go on her run? How do Rosa’s body systems work together to get the molecules she needs into her cells? How do her cells use these molecules to make energy for her body to run?
Answer:
She mainly needs the Peanut Butter because it has a lot of protein and her cells worked together to help her run.
Answer:
mostly PB for proteins
Explanation:
What is the relationship between the kinetic energy of molecules in a solid and a liquid? Justify your response in two or more complete sentences.
will give brainliest
Answer:
Gases have more kinetic energy than liquids
Explanation:
Gases have more kinetic energy than liquids. Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces.
hope this helps
99 POINTS!! Question: Tell what information each number or symbol in a chemical formula tells you. (Please be specific :)
1. subscript
2. coefficient
3. parentheses
4. element symbol
5. no number written
Answer: A subscript or superscript is a character that is set slightly below or above the normal line of type, respectively. It is usually smaller than the rest of the text. Subscripts appear at or below the baseline, while superscripts are above.
a coefficient is a constant term related to the properties of a product. In the equation that measures friction, for example, the number that always stays the same is the coefficient.
Parentheses are used in mathematical expressions to denote modifications to normal order of operations (precedence rules). In an expression like , the part of the expression within the parentheses, , is evaluated first, and then this result is used in the rest of the expression.
Chemical symbols are abbreviations used in chemistry for chemical elements, functional groups and chemical compounds. Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalized.
That there are no numbers present in the chemical formula means that there is one atom of each element present in the molecule. The Periodic Table reveals that Na is the symbol for sodium, and Cl is the symbol for chlorine.
Explanation:
Is this Good enough?
Answer:
1. A subscript or superscript is a character that is set slightly below or above the normal line of type, respectively. It is usually smaller than the rest of the text. Subscripts appear at or below the baseline, while superscripts are above.
2. In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters and must be clearly distinguished from the other variables.
3. In rhetoric, a parenthesis or parenthetical phrase is an explanatory or qualifying word, clause, or sentence inserted into a passage. The parenthesis could be left out and still form grammatically correct text. Parentheses are usually marked off by round or square brackets, dashes, or commas.
4. Chemical symbols are abbreviations used in chemistry for chemical elements, functional groups and chemical compounds. Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised
5. The numero sign or numero symbol, №, is a typographic abbreviation of the word number indicating ordinal numeration, especially in names and titles. For example, using the numero sign, the written long-form of the address "Number 22 Acacia Avenue" is shortened to "№ 22 Acacia Avenue", yet both forms are spoken long
Explanation:
BTW i copied and pasted from the internet, i did not have time to write it all down cause im on an edge quiz, sorry.
1. How many moles of potassium are present in 4.23 x 1025 potassium atoms?
(show solution)
please help if u know only. ty
Answer:
70.26 moles
Explanation:
1 mole of potassium will contain 6.02 x 10²³ atoms of potassium
6.02 x 10²³ atoms of potassium = 1 mole
4.23 x 10²⁵ atoms of potassium = 4.23 x 10²⁵ / 6.02 x 10²³
= 70.26 moles .
What do scientists use gamma rays for?
Answer: To determine the elements on other planets. The Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) Gamma-Ray Spectrometer (GRS) can measure gamma rays emitted by the nuclei of atoms on planet Mercury's surface that are struck by cosmic rays.
Explanation:
Who has a higher frequency X-ray or, radio waves?
Answer:
radio waves
Explanation:
what ionic are compounds used in our daily life?
Answer:
Explanation:
NaCl sodium Chloride as ordinary salt
Naf sodium fluoride is used in toothpaste which we use every day
How I do this? and I need help like now!
Answer:
1ohm
Explanation:
Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction
Answer:
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
Explanation:
The mass of the reactants and products are equal and are not dependent on the physical state of the substances.
Law of conservation of mass and and law of conservation of energy describes this reaction very well.
What is law of conservation of mass?Law of conservation of mass states that that mass is neither created nor destroyed and remains constant over time.What is law of conservation of energy?Law of conservation of energy states that that energy is neither created nor destroyed , it only changes from one form to another form.How it is related with photo synthesis?In photosynthesis reaction plants uses sunlight as energy to convert carbon dioxide and water into glucose and oxygen.In this reaction total number of carbons , hydrogens and oxygens used remains constant.Thus, Law of conservation of mass and and law of conservation of energy describes this reaction very well.
Learn more about photosynthesis here
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1/4 checkpoint
Time of Trial #1 (s)
2. 15
Time of Trial #2 (s)
Time of Trial #3 (s)
Average time (s)
2.05
2.02
2.07
Use the table to answer the questions.
What is the fastest time trial for the first quarter checkpoint?
seconds
What is the slowest time trial for the first quarter checkpoint?
seconds
What is the range of times measured for this checkpoint?
Answer:
here's the answers
Explanation:
Answer:
1. 2.02
2. 2.15
3. 0.13
Explanation:
doing it now of EDG :)
What group on the Periodic Table contains the elements of the alkaline
earth family?
Answer:
The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Explanation:
hope that helps
Calculate the energy needed to raise the temperature of 165.0 g of water from 10.0°C to 40.0°C. The specific heat capacity for water is 4.2J/g °C.
Answer:
20790 J
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 165 g.
Initial temperature (T1) 10 °C.
Final temperature (T2) = 40 °C.
Specific heat capacity (C) = 4.2 J/g °C.
Heat (Q) required =?
Next, we shall determine the change in temperature of water. This can be obtained as illustrated below:
Initial temperature (T1) 10 °C.
Final temperature (T2) = 40 °C.
Change in temperature (ΔT) =?
ΔT = T2 – T1
ΔT = 40 – 10
ΔT = 30 °C
Finally, we shall determine the heat energy required to raise the temperature of the water as follow:
Mass (M) = 165 g.
Specific heat capacity (C) = 4.2 J/g °C.
Change in temperature (ΔT) = 30 °C
Heat (Q) required =?
Q = MCΔT
Q = 165 × 4.2 × 30
Q = 20790 J
Thus, the heat energy required to raise the temperature of the water is 20790 J
What is the mass of 35.0L of oxygen?
Answer:15.9994 g/mol
Explanation:
11. When a plant is growing, coming into view that is known as:
A.Photosynthesis
B. Emergence
C.Xylem
D. Phloem
Answer:
B
............. M
Explanation:
Emergence
Hydrochloric acid and sodium hydroxide can be combined to form sodium chloride and water. Which best explains the reaction?
Answer:
The mass of sodium hydroxide will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water
The mass of hydrochloric acid will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water
Explanation:
Answer:
The mass of sodium hydroxide will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water
The mass of hydrochloric acid will result in the same mass of sodium chloride.
The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water
Explanation:
How many joules of energy are required to vaporize 512.0 g of water?
Answer:
The heat required to evaporate 512 g of water initially at 0°C is 1,371,340.8 J
Explanation:
The given parameters are;
The mass of water given in the question = 512.0 g
The specific heat capacity of water = 4.184 J/(g·°C)
The heat of vaporization of water = 2,260 J/g
The heat, Q, required to raise the temperature of 512.0 g from 0°C to 100°C is given as follows;
Q = 512 × 100 × 4.184 = 214,220.8 J
The heat required to vaporize 512.0 g of water at 100°C = Mass × Heat of Vaporization
The heat required to vaporize 512.0 g of water at 100°C = 512 × 2260 = 1,157,120 Joules = 1,157.12 kJ
The heat required to evaporate 512 g of water initially at 0°C is therefore;
214,220.8 J + 1,157,120 J = 1,371,340.8 J.