The work of which scientist was most essential to the use of the scientific
method and quantitative measurements in chemistry?
Answer:
Antoine Laurent Lavoisier
570
Round 0.010229 to two sig figs
0.010
0.1022
0.0
0.010000
Answer:
0.010
Explanation:
Significant Figures Rules:
1. Anything that isn't a zero is a sig fig
2. If a decimal point comes after the ones digit, everything before the decimal is counted as sig fig (i.e 2000. would be 4 sig figs).
3. If we are dealing with small decimals, the zero before and after the decimal (i.e 0.002) is a placeholder and is not counted as sig figs.
4. Any zeros between 2 significant digits is considered in sig figs (i.e 2002 would be 4 sig figs)
5. Any zeros after a significant digit in a decimal (i.e 0.020) is considered a sig fig
0.0102 would be 3 sig figs. Rounding to the thousandths place of 0.010 would be 2 sig figs.
Calculate the average speed for an airplane that went a distance of 600 miles in
3 hours
A plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as a thermal plasma. ionized plasma. low density plasma. nonthermal plasma.
Answer:
For comprehension, the question is written properly with options attached below:
plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as:
A. a thermal plasma.
B. ionized plasma.
C. low density plasma
D. nonthermal plasma.
The correct answer to the question above is "Option D (nonthermal plasma.)"
Explanation:
Plasma, for example radiant sun are state of matter made up of atoms where the ions move freely, there are composed of photons and free electrons but the positive and negative ions are equal creating a swirling gas of positive ions and negative electron and they are also good conductors of electricity as their charged particles move.
Unlike thermal plasmas that ensure their temperature is equal to their surroundings, non-thermal plasma, is not in equilibrium with its surrounding., in other words, non-thermal plasma never reaches temperature that is equal to their surroundings. They can be formed by electrifying electromagnetic waves.
A plasma with particles that never collide frequently to exchange kinetic energy is : ( D ) Nonthermal plasma
A plasma is a body of matter made up photons and freely moving ions contained its atoms the free moving ions are both positive and negative ions which are equal to each other.
A Thermal plasma collide frequently enough to reach a temperature that is equal to the temperature of the surroundings while Nonthermal plasma does not collide enough and does not reach an equilibrium temperature with its surrounding.
Hence we can conclude that A plasma with particles that never collide to exchange kinetic energy is A Nonthermal plasma.
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How many dimes could you trade for 360 pesos? $1 = 1500 pesos.
O 1.5 dimes
O 5.4 dimes
O 540 dimes
O 2.4 dimes
Answer:
The correct option is (d).
Explanation:
It is given that,
1$ = 1500 pesos
We need to convert 360 pesos into dimes
We can convert 360 pesos to dollars as follows:
[tex]360\ \text{pesos}=\$\dfrac{1}{1500}\times 360\\\\=$0.24[/tex]
360 pesos is equal to $0.24
Also, 1 dollar = 10 dimes
We can covert 0.24 dollar to dimes as follows :
0.24 dollar = 10 × 0.24 dimes
0.24 dollar = 2.4 dimes
or
360 pesos = 2.4 dimes
A human zygote has 46 chromosomes. This number of chromosomes represents what in a human cell?
Maggie loves fresh brownies, and her grandma told her if she places a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of Betty Crocker brownies. She places 6 brownies in 6 individual tupperware containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the brownie containers, and leaves the other three alone. Each day for three weeks she measures the moistness of the brownies and records her results. What is the independent variable? What is the dependant variable? What are the constants? Hypothesis? What are the control groups? What is the experimental group?
Answer:
Independent variable - Piece of bread
Dependant variable - Moistness of brownie
Constants- Same size and location of brownie
Hypothesis - IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Control groups- The set of brownie containers she adds no piece of bread to
Experimental group- The set of brownie containers she adds a piece of bread to
Explanation:
The hypothesis in an experiment is a testable explanation to a given problem, which is whether a piece of bread can make brownie moist in this question. Hence, a possible hypothesis will be: IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Independent variable is the variable that the experimenter changes or manipulates in the experiment. In this case, the independent variable is the PIECE OF BREAD added to the brownie.
The dependent variable is the variable that is being measured in an experiment. The dependent variable in this case is the MOISTNESS of the brownie
Constants are variables that the experimenter keeps unchanged for all the groups throughout the experiment. In this case, the constants are SAME SIZE AND LOCATION OF BROWNIE.
Control group is the group that does not receive the experimental treatment or independent variable while the experimental group is the group that receives the experimental treatment. The control group in this experiment is: The set of brownie containers she adds no piece of bread to, while the experimental group is the: The set of brownie containers she adds a piece of bread to
Which lists the elements in order from most conductive to least conductive?
3
potassium (K), selenium (Se), germanium (Ge)
germanium (Ge), potassium (K), selenium (Se)
selenium (Se), germanium (Ge), potassium (K)
potassium (K), germanium (Ge), selenium (Se)
Answer:
D on edge
Explanation:
just took test
The list of elements in order from most conductive to least conductive is; potassium (K), germanium (Ge), selenium (Se).
Conductivity is a property of metals. The more "metallic" an element is, the greater its conductivity.
The most metallic element in the list is Potassium hence it has the highest conductivity (1.4×107 S/m) followed by germanium which is a semiconductor (2000 S/m). Selenium has the least electrical conductivity.
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studying the process of photosynthesis in plants
Answer:photosynthesis is a prosses of making food in plants.
The raw materials that are needed
are water carbondioxide,chlorophyl.
And the products are glucose for the plant and oxygen realesed to the atmosphere.
What are 2 examples of what happens when scientist do not have a standard system of measurement of the scientific community?
Answer:
Explanation:
The standard system of measurement is what is popularly referred to as SI unit (or international system of units). For example, the SI unit for length is basically in meters (m), which is convertible to millimeter (mm), centimeter (cm) or even kilometer (km).
If there is no standard system of measurement,
1) Scientists will not be able to compare data as every scientist will use a unit that suits him/herself which might make data incomparable as some units might be difficult to convert to other units or there conversion methods might even be debatable.
2) There might be a general lack of understanding of the research work done by a scientist/scientists in the scientific community. This is because the standard system of measurement affords scientists to communicate properly with the same or convertible units and based on 1. above, if scientists use any unit that isn't agreed upon, different/unknown/debatable units might make understanding of research works incomprehensible.
Which model is most likely used to show something that happens too slowly to see? 1.A model of a weather system 2.A model of mountain formation 3.A model of the area of a circle 4.A model of an architectural building
Answer:
model of mountain formation
Explanation:
The formation of mountains takes millions of years. This formation of mountains involves so much processes that do not occur quickly.
Hence, a model that can adequately show something that happens very slowly is the model for the formation of mountains.
carbon + oxygen= carbon dioxide ( give me answe)
Answer:
C+O2=CO2
Explanation:
During combustion the reaction is formed.
how did Bohr change Rutherford's model
Explanation:
To solve that deadlock problem, in 1913 Bo kept Rizopho's model of planetary atom and combined with Plang quantum theory, he produced a hydrogen atom model with the following three determinations: - In atoms, The clectron cannot orbit any other, but only rotates with a certain number of orbits. Each "allowed" orbit is equivalent to a certain energy. - When rotating in "allowed" orbits, electrons do not lose energy, meaning they do not emit radiation, but emit radiation only when the electron jumps from an orbit with the high energy level in the orbit corresponding to the the low energy and the household energy of radiation are equal to the difference of the two energy levels. - - When rotating in those "allowed" orbits, the electron has a momentum moment that is an integer times of h / (2π).
PLEASE ANSWER QUICKLY ILL GIVE BRAILYEST!! IM ON THE TEST NOW What is the temperature of the Sun's middle most layer the chromosphere? It’s temperature is 5,500 degrees celsius to 6,000 degrees celsius. It’s temperature is 6,000 degrees celsius to 20,000 degrees celsius. It’s temperature is 20,000 degrees celsius to 2,000,000 degrees celsius. It’s temperature is 2,000,000 degrees celsius to 3,000,000 degrees celsius.
Psychology is considered a science because it uses a systematic method of asking and answering questions true or false
Psychology is considered a science because it uses a systematic method of asking and answering questions true or false
It's true
is being flammable a physical or chemical property?
Answer:
Chemical
Explanation:
I bake some flour until it turns into leavened bread. Is this a physical or chemical change? Why do you think this?
A 5 gram round ball has a density of 1.25 grams/milliliter. What is the volume of the round ball?
Explanation:
m=5g
density=1.25g/ml
density=m/v
v=m/density=5/1.25
Problem #1 : Radioisotopes are used for a variety of medical purposes including as cancer treatments. Attaching an alpha emitter to an antibody allows for a targeted therapy which can be less damaging to healthy tissue than some other cancer treatments. One such alpha emitter is Astatine 211 (211At) which undergoes LaTeX: \alpha α decay (hence the name, alpha emitter).
1.) What isotope is created by the LaTeX: \alpha α decay of 211At? 2.) How many p+, n0, and e- does it have?
Problem #2 : The grand dream of the protoscience called Alchemy was the transmutation of Lead (Pb) into Gold (Au). Thousands of years later, surely we can do better... after all, Platinum (Pt) is what everyone wants these days. We'll start with an isotope of lead, 209Pb which undergoes LaTeX: \beta β - decay. In reality, that is the end of our tale. However, this is a thought exercise and we can do what we want. Using the different types of radioactive decay described above, but still starting with LaTeX: \beta β - decay, how could we get 209Pb to Pt?
1.) What isotope is created by the LaTeX: \beta β - decay of 209Pb?
2.) Come up with a sequence of radioactive decay steps that would then lead to an isotope of Pt.
3.) What isotope of Pt did you create? How many p+, n0, and e- does it have?
Answer and Explanation: Many nuclei are radioactive, which means they emit particles to become stable. In the process, they also become a different element. There are 3 types of decay:
Alpha decay: it emits a particle of Helium, i.e., emits a particle with 2 as atomic number (Z) and 4 as atomic mass (A);Beta decay: emits an electron: a particle with 0 mass and -1 as atomic number;Gamma decay: emits a high energy form of electromagnetic radiation and it is extremely dangerous and penetrating;Problem #1:
1.) Astatine: Z = 85 and A = 211
Alpha decay: [tex]{{A=211} \atop {Z=85}} \right. At[/tex] ⇒ [tex]{{207} \atop {83}} \right. Bi + {{4} \atop {2}} \right. \alpha[/tex]
The isotope created is Bismuth
Characteristics: Z = 83; e⁻ = 83; n = A - Z = 207 - 83 = 124
The isotope is Bismuth with 83 protons, 83 electrons and 124 neutrons.
Problem #2
1.) Lead: Z = 82 and A = 82
Beta decay: [tex]{{209} \atop {82}} \right. Pb[/tex] ⇒ [tex]{{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta[/tex]
The isotope created is talium.
2.) [tex]{{209} \atop {82}} \right. Pb[/tex] ⇒ [tex]{{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta[/tex]
[tex]{{209} \atop {81}} \right. Tl[/tex] ⇒ [tex]{{205} \atop {79}} \right. Au+{{4} \atop {2}} \right. \alpha[/tex]
[tex]{{205} \atop {79}} \right. Au[/tex] ⇒ [tex]{{205} \atop {78}} \right. Pt+{{0} \atop {-1}} \right. \beta[/tex]
3.) The isotope created is [tex]{{205} \atop {78}} \right. Pt[/tex].
p⁺ = 78; e⁻ = 78; n = 127
The isotope created ahs 78 protons, 78 electrons and 127 neutrons.
A gold-colored ring has a mass of 17.5 grams and a volume of 0.82 mL. What is the density of this ring?
Answer:
21 g/mL
Explanation:
To solve this problem, first look at the density equation, which is D=M/V, which D stands for density, M stands for mass, and V stands for volume. When you substitute in the variables, you get D=17.5/.82, which is equivalent to 21.34. However, since we need to pay attention to the sig fig rules for multiplying, we need to have the same amount of sig figs as the value with the least amount of sig figs, which is the number .82. .82 has two sig figs, so you round down. Your answer will be 21 g/mL.
Which of these is a physical property?
A) ability to burn a piece of paper
B) pure sodium reacts violently with water
C) the boiling point of water is 100’C
D) helium does not tend to react with anything
The density of aluminum is 2.70 g/cm3. What is the mass of 235 cm3 of aluminum?
634.5 g
635 g
635 g/cm3
634.5 ml
Answer:
JUST B
Explanation:
Which statement accurately compares the trends in atomic number and atomic mass in the periodic table
Answer: is C
Explanation:
Both the atomic mass and the atomic number increase from left to right
Answer:
The answer is number 3
Explanation:
4. Express the answers to the following problems in scientific notation. Hint: Use the subtraction example to solve the addition problem. A. (1.8 X 1020) X (2.5 X 10^16) C. (9.2 X 10^19) ÷ (3.0 X 10^7) B.(7.9 X 10^9) - (6.0 X 10^8) D. (4.2 X 10^9) + (8.0 X 10^18)
Answer:
see below
Explanation:
A. (1.8 X 10^20) X (2.5 X 10^16)
= 4.5 x 10³⁶
B.(7.9 X 10^9) - (6.0 X 10^8)
= 7.3 x 10⁹
C. (9.2 X 10^19) ÷ (3.0 X 10^7)
= 3.067 x 10¹²
D. (4.2 X 10^9) + (8.0 X 10^18)
= 8.00000002042 x 10¹⁸
Answer:
see below
Explanation:
A. (1.8 X 10^20) X (2.5 X 10^16) = 4.5 x 10^36
B.(7.9 X 10^9) - (6.0 X 10^8) = 7.3 x 10^9
C. (9.2 X 10^19) ÷ (3.0 X 10^7) = 3.067 x 10^12
D. (4.2 X 10^9) + (8.0 X 10^18) = 8.0 x 10^18
The distance between two points on a map is 0.704 kilometers. What is the distance in meters?
Answer:
704 meters
Explanation:
1 Kilometer = 1000 meters
0.704 km * 100m/ 1 km = 704 m
Does corrosion occur when iron nail is in salt water
Answer:
Yes
Explanation:
: The corrosion of iron indicates a chemical change in the metal. ... Where salt is present, electrochemical corrosion occurs, and the protective oxide film does not form, thus the corrosion (buildup of rust) continues unchecked. Your iron nail will indeed rust more quickly and severely in salt water.
Iron has a density of 5.5 g/mL. What would be the volume of a 1500 g sample?
Answer:
volume = 272.7 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{Density} [/tex]
From the question
mass of Iron = 1500 g
Density = 5.5 g/mL
Substitute the values into the above formula and solve
That's
[tex]volume = \frac{1500}{5.5} \\ = 272.727272...[/tex]
We have the final answer as
volume = 272.7 mLHope this helps you
A container has a mass of 3.5 grams and a volume of 2.3 cm. What is the density of the container?
Answer:
1.5217391304348 gram/cubic centimeter is the density
3.5 gram/2.3 cubic centimeter
The density of the container is 1.52gms/cm.
What is density?Three of a fundamental properties of certain objects are basically mass, volume, and density.
Mass characterizes how heavy the material is, volume defines its size, and density is referred to as mass divided by volume. Despite the fact that mass and volume are everyday concepts.
One of an object's most important and easily measured physical properties is its density.
Densities are commonly used to identify pure substances as well as to characterize and estimate the composition of various types of mixtures.
Density is an important concept because it determines which substances will float and which will sink.
Substances float in general if their density is less than the density of the liquid in which they are placed.
Given that,
Mass = 3.5gm.
Volume = 2.3 cm.
Density = ?
We know that,
Density = mass/volume.
Density = 3.5/2.3
Density = 1.52gms/cm.
Thus, the density for the given data is 1.52gms/cm.
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When ionic solids dissolve in water, they produce soluble aqueous cations and anions. For example, adding MgBr2 solids to water will produce ions according to the dissolution reaction below.MgBr2(s) ? Mg2+(aq) + 2 Br?(aq)
solid cation anionIn this lab, you will be mixing two solutions containing soluble ions and observing any reactions that occur. Please write the dissolution reaction for the ionic solid Al(NO3)3.(Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer. Explain each step.)
Answer:
Al(NO3)3(s)--------> Al^3+(aq) + 3NO3^-(aq)
Explanation:
The equation shown above describes the dissolution of Al(NO3)3 in water using the lowest coefficients.
This occurs when solid Al(NO3)3 is added to water. It dissolves to give rise to ions as shown. This is a property of all ionic substances.
How many significant figures are in 463?