Final answer:
The components that are a part of all scientific investigations include a scientific question, hypothesis, variables, control, procedure, and conclusion. These align with the scientific method and are essential in conducting a thorough and systematic inquiry.
Explanation:
The components that are part of all scientific investigations include several elements that align with the scientific method. These are essential for ensuring a systematic approach to the inquiry process. Let's review these components:
Scientific question: This is the starting point of any scientific inquiry, where the observer asks a question about the phenomena of interest.Hypothesis: A hypothesis is an educated guess or a proposed explanation made on the basis of limited evidence, which serves as a starting point for further investigation.Variables: These are elements of the experiment that can be changed or controlled, including independent variables (which are manipulated) and dependent variables (the response to the manipulation).Control: In scientific experiments, a control is a standard of comparison for checking or verifying the results of an experiment.Procedure: This is the step-by-step plan for the experiment, detailing how the hypothesis will be tested.Conclusion: This summarizes the results of the experiment and states whether the hypothesis was supported or not.By following these components, scientists conduct thorough and replicable experiments that contribute to the body of scientific knowledge. Each step is crucial in ensuring results are reliable and valid.
Final answer:
The components of all scientific investigations include a scientific question, a hypothesis, variables, control, procedure, and a conclusion. These elements structure the investigation for consistency and repeatability.
Explanation:
The components that are part of all scientific investigations typically include:
A scientific question which the investigation seeks to answer.A hypothesis, which is a testable prediction made before conducting the experiment.Variables, which include independent variables (that you change), dependent variables (that you observe), and controlled variables (that you keep the same).A control, which is the standard that you compare with the outcomes of the experiment.A procedure, which outlines the steps taken during the experiment.A conclusion, which reflects whether the hypothesis was supported or not based on the experiment's findings.These elements help in structuring a scientific investigation, allowing for repeatability and verifiability by other scientists.
What is the answer to number 14 ?
Answer:
a) 2 significant figures
b) 5 significant figures
c) 5 significant figures
d) 1 significant figures
Explanation:
• All non-zero digits are significant.
E.g. - 421 has 3 significant figures.
• Zeros between non-zero digits are significant.
E.g. - 502 has 3 significant figures.
• In a decimal less than 1, all zeros to the left of non-zero digits are not significant.
E.g. - 0.0345 has 3 significant figures.
Removing Whiteboard marker residue off of books??? (Chemicals or daily products)
Answer:
Try a magic eraser!
Explanation:
Answer:
All you have to do is put a little rubbing alcohol on a rag or paper towel, rub it over the dried marks, and the Expo marker comes right off. It works on boards, books, and most other Expo marked surfaces (like refrigerators, windows, laminate countertops, etc).
What is the density of an object if it’s mass is 15 g and it’s volume is 3cm3
Final answer:
The density of an object with a mass of 15 grams and a volume of 3 cm³ is 5 grams per cubic centimeter (5 g/cm³).
Explanation:
The density of an object is calculated by dividing its mass by its volume. In this case, the mass of the object is given as 15 grams and the volume is 3 cm³. The formula for calculating density is:
Density = Mass / Volume
Applying the values provided:
Density = 15 g / 3 cm³ = 5 g/cm³
Therefore, the density of the object is 5 grams per cubic centimeter (5 g/cm³).
whats the factor you observe or measure during an experiment
Answer:
Dependent variable
Which statement about oxidation and reduction in a voltaic cell is true? A. Both oxidation and reduction occur at the anode. B. Both oxidation and reduction occur at the cathode. C. Oxidation occurs at the anode and reduction occurs at the cathode. D. Oxidation occurs at the cathode and reduction occurs at the anode.
Answer:
C. Oxidation occurs at the anode and reduction occurs at the cathode.
Choice number third is the correct option for the given question
Explanation:
Copper and silver nitrate are the two components that form a voltaic cell. These are the two main ingredients which make the Redox reaction possible. The dog reaction that is taking place result in development of charge.
Since copper here is the anode in the reaction oxidation happens here by the solution[tex]AgNO_3[/tex] is cathode this is where reduction takes place.
(Na2O / MgO / Al2O3 / p2O5 / So2 )
physical state :
Appearance:
Solubility:
Color:
Acidic or Basic nature :
Answer:
Na²O (Sodium-oxide)
Explanation:
Physical state - Solid
Appearance - White solid
Solubility - Yes. Formes NaOH
Color - White
Nature - Basic
What is the final step of the scientific method?
communicating results
collecting data
proving the hypothesis
writing a conclusion
Communicating Results
pls help me I need this answer ______ are easier to work with than reality and can be manipulated. Computers Observations Experiments Models
it is not observations
Answer:
Models
Explanation:
Models are abstractions of the real world. Models helps to mimick what is actually the true representation of a body. It is easier to work with models because they are our own creation. This makes them flexible to carryout any form of adjustments and manipulations. We can try out a model with different variables to simulate an obtainable result.
Models are easier to work with than the complex reality with a lot of factors and conditions that may not be easily predictable and under control.
Determine how many grams of CO2 are produced by burning 8.21 g of C4H10
Answer:
25.872 g of carbon dioxide will produced.
Explanation:
Given data:
mass of butane (C4H10) = 8.21 g
mass of carbon dioxide = ?
Solution:
Chemical equation
C4H10 + O2 → CO + H2O
Balanced chemical equation
2C4H10 + 13O2 → 8CO + 10H2O
First of all we will calculate the moles of butane.
number of moles = mass/ molar mass
number of moles = 8.21 g/ 58 g/mol
number of moles = 0.147 mol
from balanced chemical equation we will compare the moles of C4H10 with CO2,
C4H10 : CO2
2 : 8
0.147 : 8/2×0.147 = 0.588 moles
now we will calculate the mass of carbon dioxide from moles,
mass of CO2 = number of moles × molar mass of CO2
mass of CO2 = 0.588 mol × 44 g/mol
mass of CO2 = 25.872 g
By applying stoichiometry principles to the combustion of butane (C4H10), it is calculated that burning 8.21 grams of butane will produce approximately 24.82 grams of CO2.
The question asks to determine how many grams of CO2 are produced by burning 8.21 g of C4H10 (butane). To solve this, we first need to understand the balanced chemical equation for the combustion of butane, which is C4H10 + 13/2 O2 -> 4 CO2 + 5 H2O. This indicates that for every molecule of butane combusted, 4 molecules of CO2 are produced.
First, calculate the molar mass of butane (C4H10): (4x12.01) + (10x1.008) = 58.14 g/mol. Thus, 8.21 g of C4H10 is 8.21/58.14 = 0.141 moles. According to the balanced equation, combusting 1 mole of butane produces 4 moles of CO2, so 0.141 moles will produce 0.141 x 4 = 0.564 moles of CO2.
Finally, calculate the mass of CO2 produced: 0.564 moles x 44.01 g/mol (molar mass of CO2) = 24.82 grams of CO2.
Wood burning in fire
Is this supposed to be a question or something??? if so i need context.
Wood burning, particularly for home heating, involves the combustion of wood to release thermal energy. Modern techniques, such as the use of efficient wood stoves, aim to reduce the environmental impact by cutting down on pollutants. The sustainability of wood as a fuel largely depends on the sourcing and management of the harvested wood.
Explanation:The process of wood burning in fireplaces or for home heating is an application of combustion, wherein wood is used as a biomass fuel. This process converts the carbon in wood into carbon dioxide and releases a significant amount of thermal energy. Modern home heating methods, such as high-efficiency wood stoves or fireplace inserts, have been developed to burn wood more efficiently than traditional open fireplaces. These advanced heating systems are designed to minimize pollutant emissions, such as carbon monoxide and particulate matter, making them a cleaner alternative to fossil fuels.
However, the sustainability of using wood as a fuel depends heavily on the source of the wood. If harvested from managed forests or urban trees that necessarily need to be removed, it can be a renewable resource. But, the indiscriminate cutting of wood, particularly in undeveloped countries for cooking and heating, can lead to deforestation and negatively impact ecosystems.
What is the term used to explain how everything is headed toward a state of randomness?
Question 6 options:
Ionic bonding
Biomolecules
Entropy
Random Acts
The term used to denote randomness is entropy, the correct option is C.
What is entropy?The entropy of an object is a measure of the amount of energy that cannot be used to perform work.
Entropy is also a measure of the number of possible configurations for atoms in a system. Entropy is a measure of uncertainty or randomness in this sense.
The entropy of a physical system is proportional to the amount of energy that is no longer available to do physical work in classical physics.
Entropy is central to the second law of thermodynamics, which states that any activity in an isolated system increases entropy.
Entropy cannot be destroyed by any means at any scale, so it cannot decrease overall.
Thus, the correct option is C.
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a controlled experment is designed to test a ?
Answer:
Hypothesis.
Explanation:
Investigation where only the independent variable is being tested by the scientist.
rewrite using a single exponent
5(4) • 5(3)
Answer:
the answer is 5⁷
Explanation:
it is 5 to the power of 7 because 5 is it base and then the 4 and 5 get added to get ur exponent
All atoms that can enter into chemical reactions do so to either share, gain or lose electrons to achieve a stable state.
True
False
Answer:true
Explanation:
ASAP Which of these is a chemical property?
Ability to form a compound
Melting at 0 degrees Celsius
Is a liquid at room temperature
Ability to conduct heat
“Ability to form a compound” is a chemical property.
Answer: Option A
Explanation:
Each element exhibits its characteristic physical and chemical properties. The physical properties of an element describes the boiling point, melting point, freezing point, density, inherent state of matter, electrical and thermal conductivity, etc. The change in physical properties occur when there is a change in the phases and not any change in the chemical composition.
But for chemical properties, these properties explain the bond strength of the elements. It helps to decide the reactivity, flammability of substances. The chemical properties of substance or element decide how easily it can react or get burned.
Any properties or reactions which lead to formation of compounds different from the reactants are considered as chemical change of the reactants. So we can say that the ability to form a compound is a chemical property as in this case, the reactants will react with each other in presence of external heat if required to form the product compound whose chemical composition and properties will be different from the reactants.
how do laboratory tools improve the observations made by a scientist?
Answer:
Explanation:
Tools, instruments, apparatus are very key to research works carried out in the laboratory. The more sophisticated they become, the more efficiency they provide in making ground breaking researches.
Over the years, technological advancement has afforded scientists with new way of achieving precision and accuracy in their procedures by developing cutting edge facitlities. These equipment can help carry out better experiment and make observations simple and easy to do.
Explanation:
laboratory tools improve the observations made by a scientist in the following ways:
Primarily by improving the accuracy and precision.laboratory tools improve the efficiency of the experiment or observation made by a scientist.laboratory tools help by decreasing time and giving more prominent reproducibility of outcomes.Laboratory tools enhance the research and it makes the things easier to distinguish. laboratory tools has make more accessible the work of scientist on their research.laboratory tools help the scientist to examine their experiments for example when they want to analyze specimen, they use microscope.
What is the weight of 7.9 ml of a solution that has a density of 1.1 g/mL?
Answer:
8.69 g
Explanation:
density = 1.1 g/mL
it means,
1 ml of the solution has a mass of 1.1 g
∴7.9 ml of the solution has a mass of =(1.1 x7.9) g
=8.69 g
The number _cause of death in people between the ages of 16 and 24 is
alcohol-related driving accidents.
Otwo
three
four
one
Answer: most is 3
Explanation:
Find the Missing Word.
______ is a major characteristic used to differentiate between a plain and a plateau
Answer: Hill is a Major characteristic used to differentinate between a plain and plateau
Explanation:
the calculator reads 7834.87 round this to 3 sig figs
Answer:
783
Explanation:
Because all of the numbers are Sig figs but the first three of them are 783
To round 7834.87 to 3 significant figures, identify the first three non-zero numbers which are 7, 8, and 3. The next digit is '4', which is less than 5, so we don't round up. Therefore, when rounded to 3 significant figures, 7834.87 becomes 7830.
Explanation:In the number 7834.87, rounding to three significant figures means we only keep the three most meaningful digits, typically the first three non-zero digits from the left side of the number. In this case, those numbers are 7, 8, and 3. When you round 7834.87 to the nearest three significant figures, look at the digit following the third significant figure. If that digit is 5 or higher, we round up the third significant figure. If it's 4 or lower, we leave the third significant figure as it is. In this case, the digit following the third significant figure is '4', which is lower than 5. So, 7834.87 rounded to three significant figures is 7830.
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1. 1.0 km or 1.0 mi
Larger quantity:
2. 0.5 kg or 0.5 lb
Larger quantity:
3. 2.5 qt or 2.5 L
Larger quantity:
4. 0.0045 cm or 0.0045 in.
Larger quantity:
English and SI
Answer:
1. 1 mi; 2. 0.5 kg; 3. 3.5 qt; 4. 0.0045 in
Explanation:
We must make the units of each measurement the same.
1. Kilometres vs. miles
[tex]d =\text{1 km} \times \dfrac{\text{1 mi}}{\text{1.609 km}} = \text{0.6 mi}[/tex]
The larger measurement is 1 mi.
2. Kilograms vs. pounds
[tex]m = \text{0.5 kg} \times \dfrac{\text{2.205 lb }}{\text{1 kg}} = \text{1.1 lb}[/tex]
The larger measurement is 0.5 kg.
3. Quarts vs. litres
[tex]V = \text{2.5 qt} \times \dfrac{\text{1 L }}{\text{1.057 qt}} = \text{2.3 L}[/tex]
The larger measurement is 2.5 qt.
4. Centimetres vs. inches
[tex]d = \text{0.0045 cm} \times \dfrac{\text{1 in }}{\text{2.54 cm}} = \text{0.0018 in}[/tex]
The larger measurement is 0.0045 in.
Answer: 1) 1.0mi 2) .5kg. 3) 2.5L 4). 0.0045in.
Explanation:
Nuclear energy could come from
Answer:
splitting of Barium atom
Explanation:
I just did the test :)
WHAT IS THE ATOMIC NO OF RUBINIUM[RB]
Rubidium's atomic number is 37.
Hope this helps!
Answer:
Atomic number 37!
Explanation:
Which set of coefficients would balance the following chemical equation?
H3PO4 + RbOH → H2O + Rb3PO4
Question 3 options:
2H3PO4 + RbOH → 3H2O + Rb3PO4
H3PO4 + RbOH → H2O + Rb3PO4
H3PO4 + RbOH → 2H2O + Rb3PO4
H3PO4 + 3RbOH → 3H2O + Rb3PO4
Answer:
H3PO4 + 3RbOH > 3H20 + Rb3PO4
Explanation:
The chemical equation H3PO4 + RbOH → H2O + Rb3PO4 is correctly balanced as H3PO4 + 3RbOH → 3H2O + Rb3PO4, based on the principle of conservation of atoms.
Explanation:The subject here is balancing chemical equations which is a core topic in high school chemistry. Balancing chemical equations involves adjusting the coefficients of the reactants and products to ensure that the number of atoms of each element is equal on both sides of the equation.
In the given equation H3PO4 + RbOH → H2O + Rb3PO4, the correct set of coefficients that balance the equation are H3PO4 + 3RbOH → 3H2O + Rb3PO4. So, for every one molecule of phosphoric acid (H3PO4), three molecules of Rubidium hydroxide (RbOH) react to form three molecules of water (H2O) and one molecule of Rubidium phosphate (Rb3PO4).
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Which of the following set of pictures includes only molecules?
Dimensional Analysis: How many days will it take to earn $160 if your pay is $4.00 per hour?
(assume 8 hour work days)
Find the total number of hours needed by dividing the total amount earned by the amount per hour:
160 / 4 = 40 hours
Divide the total number of hours by hours for 1 day:
40 / 8 = 5
It will take 5 days.
3 days
Explanation:
4 dollars a hour
8 hours a day
total 160
4*24=160
24÷8=3
[3]
What is the pH of a solution when the [OH - ] = 1 x 10 -3
Answer:
The pH is 11
Explanation:
Because pH + pOH = 14
and pOH = - log [OH⁻] = - log (1 x 10⁻³) = 3
we can now calculate pH by manipulating equation one above
pH = 14 - pOH = 14 - 3 = 11
Thus the pH of the solution is 11
intrusive igneous rocks form?
Answer:
Intrusive, or plutonic, igneous rocks form when magma cools slowly below the Earth's surface. Most intrusive rocks have large, well-formed crystals. Examples include granite, gabbro, diorite and dunite.
Answer:
Intrusive, or plutonic, igneous rocks form when magma cools slowly below the Earth's surface. Most intrusive rocks have large, well-formed crystals. Examples include granite, gabbra, diorite and danite.
sorry if i spelled things wrong
How many Br atoms are in 1.98 g of Br?
Answer:
1.5 x 10²²atoms
Explanation:
Given parameters:
Mass of Br = 1.98g
Unknown:
Number of atoms
Solution:
A mole of a substance is the amount of substance contained in the avogadro's number of particles.
To solve this problem, we must first find the number of moles present in the given mass of the Br atom:
Number of moles = [tex]\frac{mass}{molar mass}[/tex] = [tex]\frac{1.98}{80}[/tex] = 0.025mole.
Now we know that:
1 mole = 6.02 x 10²³
0.025 mole = 0.025 x 6.02 x 10²³ = 1.5 x 10²²atoms
Given 1.98 g of bromine, using its atomic weight (79.9 g/mol) and Avogadro's number (6.022 × 10^23 atoms/mol), we calculate that there are approximately [tex]1.49 * 10^2^2[/tex] bromine atoms.
Explanation:To determine the number of bromine atoms in a given mass of bromine, we will need to use the atomic weight of bromine, which is 79.9 g/mol, and Avogadro's number, which stipulates that there are [tex]6.022 * 10^2^3[/tex] atoms in a mole.
To convert the mass of bromine to moles, we will divide by the atomic weight: 1.98 g / 79.9 g/mol = 0.0248 moles.
To convert moles to atoms, we then multiply by Avogadro's number: 0.0248 moles × 6.022 × 10^23 atoms/mol = [tex]1.49 * 10^2^2[/tex]atoms.
So, there are approximately 1.49 × 10^22 atoms of bromine in 1.98 g of bromine.
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complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down menu.
A solid ___ a definite volume and___ a definite shape.
A liquid___ a definite volume and ___a definite shape.
A gas___ a definite volume and____ a definite shape.
Answer:
A solid has a definite volume and adefinite shape.
A liquid has a definite volume and no definite shape.
A gas has no definite volume and no definite shape.
Explanation:
Solids
Solids have a definite volume and definite shape
The particles present in a solid are very closely packed since the intermolecular forces between them are very strong. The molecules do not move apart.
Liquids
Liquids have a definite volume and no definite shape
The particles present in a liquid are closely packed since the intermolecularforces holds the molecules close together. The molecules slide over each other. Liquids take up the shape of the container
Gases
Gases have no definite volume and no definite shape
The particles present in a gas are very loosely packed since the intermolecular forces are very weak. There are no attractive forces between the molecules. Gases spread through the container
Answer:
A solid has a definite volume and a definite shape.
A liquid has a definite volume and no definite shape.
A gas has no definite volume and no definite shape.
Explanation: