Answer:
Pure Substances.
Explanation:
Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element.
1 point
A student is classifying a group of unknown solids by whether or not they float or sink in water.
Which property is the student using to classify the solids?
mass
solubility
density
melting point
True or False? The following set of quantum numbers is acceptable (0, 0, 0, +1/2). Explain.
This following set of quantum numbers
Answer:
False
Explanation:
The values of the principal quantum number range from 1- infinity. This implies that there is no such thing as an energy level with n=0.
Hence this can not be an acceptable set of quantum numbers when n=0.
Can someone please help?
Answer:
C
Explanation:
Please see the attached picture for the worked solution.
*I am unable to send it as a text and thus it is attached as an image.
What are examples of molecular compounds that we use in everyday life?
Answer:
Carbon dioxide and hydrogen monoxide
A certain chemical compound has a molar mass of 106.05 g/mol. Calculate the mass in grams of 2.58 moles of this compound.
Answer:
273.609
Explanation:
1 mole of a substance is equal to molar mass of the substance
1 mole of substance = 106.05
2.58 moles = x
then you cross multiply to get your answer
A sample of aluminum foil contains 7.90 x 10^23 atoms. What is the mass of the foil?
Answer:
35.3 g
Explanation:
Step 1: Given data
Number of atoms of aluminum: 7.90 × 10²³ atoms
Step 2: Calculate the number of moles corresponding to 7.90 × 10²³ atoms of aluminum
We will use Avogadro's number: there are 6.02 × 10²³ atoms of aluminum in 1 mole of atoms of aluminum.
7.90 × 10²³ atoms × (1 mol/6.02 × 10²³ atoms) = 1.31 mol
Step 3: Calculate the mass corresponding to 1.31 moles of aluminum
The molar mass of Al is 26.98 g/mol.
1.31 mol × 26.98 g/mol = 35.3 g
what is the atomic number of an element containing 12 neutrons and having a mass number of 24
Which of these isotopic notations represents an anion?*
Answer:
a option
Explanation:
i think this..... ...
Answer:
A is correct
Hope its help you
Explanation:
Mark me as brainliest.Describe how a constant volume calorimeter can be used to measure the heat transferred from a burning piece of coal to cool water. Justify your response in two or more complete sentences.
Answer:
See complete explanation.
Explanation:
Hello.
In this case since the calorimeter is known as a device designed in order to provide measurements regarding the amount of heat required or transferred during chemical or physical process via the temperature change for the measured mass recorded by the calorimeter. Thus, when exothermic chemical reactions are carried out inside calorimeters the temperature is increased as they release heat whereas endothermic chemical reactions produce a temperature decrease since heat is absorbed.
In such a way, for a burning piece of coal which is releasing heat due to its combustion, we can compute the heat transferred to the water by reasoning that the heat released by the coal is gained by the water so the following relationship can be written:
[tex]Q_{coal}=-Q_{water}[/tex]
Which can be also written by:
[tex]m_{coal}C_{coal}\Delta T_{coal}=-Q_{water}[/tex]
Whereas by knowing the mass, specific heat at constant volume and the temperature change for the coal, we can compute the transferred heat to the water.
Best regards.
Answer:
Calorimeter is a device used to measure the amount of heat involved in a chemical or physical process. For example, when an exothermic reaction occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature. When an endothermic reaction occurs, the heat required is absorbed from the thermal energy of the solution, which decreases its temperature. The temperature change, along with the specific heat and mass of the solution, can then be used to calculate the amount of heat involved in either case.
Explanation:
PLEASE HELP ASP...Patsy wants to find out that it would take her to walk a 10 K (10 km) if she maintains a
pace of 6.5 km/hr. How long will it take her?
Answer:
I tried doing the math I believe it is 0.65 min. converted is an 1 hour and 5 min
I need help filling out nitrogen
Which of the following statements about compounds is true?
A- Each Compound contains only one element.
A- Each Compound contains only one element.
B- Compound can be classified as either heterogenous or homogenous.
C- A Compound has a defined ratio by mass of the elements that it contains
D- Compounds Vary in chemical composition depending on the sample size.
Explanation:
A and D is the answer
Hope the answer is right
environmental science-
Which of the following statements about logistic growth curves is true?
a.
Logistic growth curves are common for R-selected species.
b.
Logistic growth curves are J-shaped.
c.
No organisms in nature experience logistic growth rates.
d.
Logistic growth curves increase exponentially at first, then experience slowed growth rates.
Answer:
D
Explanation:
Logistic growth curves increase exponentially at first, then experience slowed growth rates. Hope your question works well!!!
The statements about logistic growth curves is logistic growth curves increase exponentially at first, then experience slowed growth rates.
Thus, option D is true.
What is logistics growth curve ?
The logistics growth curve is defined as the population per capita growth rate is decreases and get smaller and the size of population increases maximum applied by resources which are limited in the environment which is known as the K that is carrying capacity.
The logistic population growth is represented by logistic growth curve on a line graph and the shape of curve is S - shaped that represents slow increase, and rapid growth in population and after that there is reduction in growth.
The best example of logistics growth is observed in wild population that includes sheep as well as harbor seals. In both of the cases the number of population increases and carrying capacity for small period of time.
Therefore,The statements about logistic growth curves is logistic growth curves increase exponentially at first, then experience slowed growth rates.
Thus, option D is true.
Learn more about logistic curve here:
https://brainly.com/question/24916887
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science is a growing body of knowledge that often relies on previous knowledge true or false
Answer:
false
Explanation:
1.Which of the following is the nature of sound wave?
Answer:
the answer is longgitudinal
Based on the Lewis electron-dot diagrams of n2 and n2h4, compare the length of the nitrogen-to-nitrogen bond in n2 with the length of the nitrogen-to-nitrogen bond in n2h4.
Answer:
The bond length of n2h4 is longer than n2
Explanation:
The triple bond in N2 has a pulling effect and greater force bringing the nitrogens closer than the N2H4 nitrogen bond, which has a lesser force leaving them further apart.
A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)
Which of the following statements is not true about the ways in which our bodies are able to block pain? A. The release of endorphins in the body assists in alleviating pain. B. Specific neural activity can limit incoming pain signals, alleviating pain. C. Information from other sensory systems can close the pain gate, alleviating pain. D. A neural pathway found in the frontal lobe assists in alleviating pain.
Answer:
D. A neural pathway found in the frontal lobe is not true
Explanation:
Had a psych lecture and test on this, I got the question right. If it's wrong I'm sorry.
A neural pathway found in the frontal lobe assists in alleviating pain isn't true about the ways in which our bodies are able to block pain
The body system have different characteristics and methods by which they
handle conditions encountered which may be as a result of external factors
such as introduction of foreign bodies into the blood or different forms of injuries.
The white blood cells and other hormones have different properties and
cells such as macrophages ,mast cells, endorphins which helps to ensure we
are alright and in good shape
The body releases chemicals known as endorphins to assist in alleviating
pain. Specific neural activity can limit incoming pain signals or process
information from other sensory systems to help alleviate the pain however,
there is no neural pathway in the frontal lobe which reduces pain .
Read more on https://brainly.com/question/17916563
Violet light has a wavelength of 422 nm, how much energy is found in this photon of violet light?
Answer:
3.025eV
Explanation:
Energy of a photon is given by
E=hν
Where h is the Planck's constant
And ν represents the frequency of the photon .
Now for violet light wavelength λ=410nm= 410x10^-9m
By using the formula ν=c/λ
where c represents speed of light I.e 3 x 10^8 m/s
Calculating energy of violet photon we have
E=hc/λ
h=6.626 x 10^-34 J.s
On inserting the value in the formula , we get
E= 4.848 x 10^-19 Joules
To convert it into electron volts we need to divide it by 1.602 x10^-19.
The final result what we have is E=3.026eV.
Note: the result calculated is according to the above value . result may vary according to the values taken .
The force of gravity pulls down on your house with a total force of 300,000 newtons. The force of gravity pulling down on your house would be exactly twice as much if your house: a Had twice as much mass b Was twice as tall c Had twice as much volume d Covered twice as much area
Answer: B. Was twice as tall
Explanation: The strength of the gravitational force between two objects depends on two factors, mass and distance. If the distance is doubled, the force of gravity is one-fourth as strong as before.
The force of gravity pulling down on your house would be exactly twice as much if your house was twice as tall. Hence option b is correct.
What is gravity?Gravity is defined as a basic interaction that pulls everything with mass or energy in the same direction. All objects with mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. The moon is maintained in its orbit around Earth by gravity, as are the planets in their orbits around the sun.
The force of gravity, which is directly dependent on the masses of the two objects, is inversely correlated with the square of the distance between two objects. This translates to an increase in gravity force with mass but a decrease in gravity force with increasing distance between objects. The force between two objects doubles if the mass of one thing doubles.
Thus, the force of gravity pulling down on your house would be exactly twice as much if your house was twice as tall. Hence option b is correct.
To learn more about gravity, refer to the link below:
https://brainly.com/question/4014727
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Which of the following is the correct calculation for determining the density of an object with a mass of 54 g and a volume of 6 mL?
Answer:
[tex]\rho =9g/mL[/tex]
Explanation:
Hello,
In this case, since the density is computed via the division of the mass by the volume:
[tex]\rho =\frac{m}{V}[/tex]
For the given mass of 54 g and volume of 6 mL, the density turns out:
[tex]\rho =\frac{54g}{6mL}\\ \\\rho =9g/mL[/tex]
Best regards.
Write the following numbers in scientific notation.
Type your answer using one of the following formats:
1.2e-3 for 0.0012
1.20e+2 for 120.
(a) 0.000 589 0
(b) 50 000.0
(c) 0.000 007 050
Answer:
for points sorry
Explanation:
assume an object A with a mass of 66.789 g and a volume of 10.1 mL. what is its density?
Answer: 6.61
Explanation:
What are significant figures?
Answer:
Significant figures are the number of digits in a value, often a measurement, that contributes to the degree of accuracy of the value.
Explanation:
All non-zero numbers ARE significant.
Zeros between two non-zero digits ARE significant.
Leading zeros are NOT significant.
Trailing zeros to the right of the decimal are significant.
Trailing zeros in a whole number with the decimal shown significant.
Migration rates, birth rates, and death rates are all ways to measure changes in __________. A. urbanization B. population C. weather D. climate
Answer:
Population
Explanation:
Which best describes the current model of the atom? It is similar to the model of the solar system with orbiting planets. It has remained the same for several centuries. It is similar to the model of plum pudding with suspended plums. It may be revised with increasing scientific knowledge.
Answer: D
Explanation:
I took the test
Why does temperature increase between changes of physical state?
An 8 gigabyte computer memory chip can be purchased for $73.99. This memory capacity is equivalent to
A.800 megabytes
B.8000 megabytes
C.80 megabytes
D.80,000
Answer:
B 8000
Explanation:
There's 1000 megabytes in one gigabyte
8 x 1000 = 8000
(a) Which of the following atoms is smallest: vanadium, chromium or tungsten? (b) Which of these atoms has the highest ionization energy? (c) Which is the most electronegative?
Answer: (a) chromium (b) tungsten (c) tungsten
Explanation:
As we move towards the right in the periodic table, atomic sizes decreases and electronegativity increases accordingly. Similarly, atomic sizes increases down the group. Hence chromium is smaller than tungsten.
However, tungsten is more electronegative than the other metals listed, as a result of this, it also has the highest first ionization energy. Hence the answer above.
PSYCHOLOGYWhen one individual perceives the events of a car crash to be different than another person, which of the following will most likely be occurring? A. One individual is present in a different context or situation than the other person, causing them to have different perceptions. B. One individual is experiencing an alternate reality, which results in a distorted perception. C. Individual perceptions could be influenced by differences in prior knowledge or experience. D. The perception of one individual is distorted because one in five individuals has problems with perceptual accuracy.
Answer:
the answer is c
Explanation:
Answer:
C. Individual perceptions could be influenced by differences in prior knowledge or experience.
Explanation:
Write this number in scientific notation
100.1
Answer:
1.001 x 10²
Explanation:
thats it broski
