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.
Maryann and josh left a cup of ocean water in the sun. When they returned a day later only salt was left in the cup. Which best explains what happens to the ocean water in the cu
Answer:
The water was evaporated from the sun only leaving salt in the cup
Explanation:
the sun done its cycle and the salt was left
Maryann and josh left a cup of ocean water in the sun. When they returned a day later only salt was left in the cup because of the evaporation.
What is evaporation?
The evaporation is a process by which an element in liquid sate gets transfer into from its liquid state to gas below the temperature at which the liquid gets boiled liquid water enters the atmosphere as water gets vaporized.
In the following the salt was in liquid state so converts into solid and liquid turns into gaseous state and salt is remained into the cup.
Therefore, Maryann and josh left a cup of ocean water in the sun. When they returned a day later only salt was left in the cup because of the evaporation.
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Which subatomic particle causes the name of the element to change?
Answer:
Proton
Explanation:
Changing the number of protons in an atom changes the type of atom.
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
When the internal energy of a material increases,: a) its temperature will rise b) it will go through a phase change c) A and B d) A or B
Answer:
a or b
Explanation:
Answer:
D. A or B
Explanation: The temperature of a substance cannot increase during phase change, so both A and B cannot happen simultaneously. And internal energy is the sum of the microscopic potential and kinetic energies of a substance, which increase with temperature and phase transition.
Calculate the average speed for an airplane that went a distance of 600 miles in
3 hours
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.
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:
The conversion factor 100mL/1 L would be used to change what
Answer:
Liters to milliliters.
Explanation:
Conversion factors are used to convert from one unit to another. The unit you are converting from goes in the denominator, and the unit you are converting to goes in the numerator. Since liters is in the denominator, you are converting from liters to another unit. Since milliliters is in the numerator, you are converting to that unit. Therefore, you would be converting from liters to milliliters.
What is the only part of an atom that cannot change (either protons, neutrons, or electrons)?
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.
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
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.
What element is in group 2 and period 4?
Answer:
Calcium
Explanation:
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.
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 solid block of substance is 74.0cm x 55.0cm x 35.0cm and has a mass of 5.69 x 105g. (569000)
Assuming that it did not chemically react with water or dissolve in it, would it float in water?
Answer:
No, it would sink in water.
Explanation:
Firstly, note that whether an object will float or sink in water is dependent on the density of the object and the water. To calculate density of the object, volume and mass is required.
According to the question, a solid block of substance is 74.0cm x 55.0cm x 35.0cm i.e. the Length (L), width (W) and height (H) are 74cm, 55cm, and 35cm respectively.
Volume = L × W × H
Volume = 74 × 55 × 35
Volume = 142,450 cm^3
Mass of the solid object = 5.69 x 105g. i.e. 569000g
Density = mass / volume
Density = 569000/142450
Density = 3.99438
The density of the solid object is 3.99g/cm^3
Consider the fact that the Density of water is 1g/cm^3. An object will FLOAT in water if the density is lower than that of water while it will SINK if the density is higher than that of water.
Since the density of the solid object is 3.99g/cm^3, which is higher than that of water (1.0 g/cm^3), the solid object will SINK in water.
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.
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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The work of which scientist was most essential to the use of the scientific
method and quantitative measurements in chemistry?
Answer:
Antoine Laurent Lavoisier
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
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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I bake some flour until it turns into leavened bread. Is this a physical or chemical change? Why do you think this?
What is the benefit to having baby steps in science occur as small bits of evidence accumulate?
If someone could help me I would really appreciate it! Thank you
Answer:
aby steps in science occur as small bits of evidence gradually accumulate. The accumulating evidence lets scientists refine and expand on earlier ideas
Explanation:
The benefit to having baby steps in science occurs as small bits of evidence accumulate is which lets scientists refine and expand on earlier ideas. The correct option is a.
What is science?Science is the subject of learning facts and ideas about the earth and other natural things present on the earth. It constitutes the phenomena and the acts behind the happening of things. They search and contribute to the reason behind something natural.
Science works based on evidence and proof. It describes the theories and facts behind natural things. So taking baby steps in science is essential to make it clear that no facts are left behind. Science always changes because of the changing of things.
Thus, the correct option is a. let scientists refine and expand on earlier ideas.
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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
Which of the following statements is true? A)If a hypothesis is proven false, a mistake has been made in the experiment.B) The independent variable is what changes as a result of the dependent variable. C) Changes in the independent variable cause changes in the dependent variable. D) Once a hypothesis is proven true, it becomes a theory and cannot be disproved. ANSWER ASAP
Answer:
D
Explanation:
once a hypothesis is proven true, it becomes a theory and cannot be disproved.
Im so glad i got help with this one because i got a hundred bc of someone.
The substance in a ___________mixture can usually be seen and are easily separated
Answer:
Heterogeneous mixture
Explanation:
A heterogeneous mixture is a mixture of two or more chemical substances (elements or compounds), where the different components can be visually distinguished and easily separated by physical means. Examples include: mixtures of sand and water. mixtures of sand and iron filings.
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 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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In an exothermic reaction is energy transferred to or from the surroundings?
Answer:
transfer energy to the surroundings
Explanation:
Exo means exit