The part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments is; "Atoms are indivisible".
One of the major postulates of the Dalton's atomic theory is that the atoms of elements are "indivisible".
This idea resounds from the earliest ideas of Greek philosophers concerning the atom.
Through the cathode-ray tube experiments, J.J. Thomson discovered sub-atomic particles.
This nullified the idea that atoms are indivisible.
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Scientists test their ideas about things they cannot observe directly by building
Answer:
yes
Explanation:
Testing scientific ideas
Testing Ideas. Testing hypotheses and theories is at the core of the process of science. ... match actual results observation, that lends support.
Write 0.034 in scientific notation.
Answer:
0.034 = 34×10^-3
Explanation:
This is because the special point is notated until it goes in front of the first counting number
Scientific notation is a way of expressing numbers that are very large or very small in a compact and standardized format. 0.034 in scientifc notation is written as 3.4 × 10⁻³
In scientific notation, a number is expressed as the product of a coefficient and a power of 10. The coefficient is a decimal number greater than or equal to 1 but less than 10, and the power of 10 represents the magnitude of the number. The power of 10 indicates the number of places the decimal point must be moved to obtain the original number.
For example:
The number 4,500,000 can be written in scientific notation as 4.5 x 10⁶, where the coefficient is 4.5 and the power of 10 is 6.
The number 0.000043 can be written in scientific notation as 4.3 x 10⁻⁵, where the coefficient is 4.3 and the power of 10 is -5.
Scientific notation allows for easy representation of very large or small numbers and simplifies calculations involving these numbers. It is particularly useful in scientific fields where values such as distances, masses, and concentrations can vary over a wide range.
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Please help me, I really need it, God Bless you <3
#1
[tex]\\ \sf\longmapsto {}^{88}_{38}Sr^{2+}[/tex]
As 2 electrons are donated Hence the No of electrons =38-2=36#2
[tex]\\ \sf\longmapsto {}^{51}_{23}V^{3+}[/tex]
As 3 electrons donated the no of electrons=23-3=20#3
[tex]\\ \sf\longmapsto {}^{55}_{26}Fe^{3+}[/tex]
No of neutrons=55-26=29#4
[tex]\\ \sf\longmapsto {}^{112}_{48}[/tex]
As 2 electrons are donated no of electrons =48-2=46#5
[tex]\\ \sf\longmapsto {}^{210}_{82}Pb^{2+}[/tex]
No of neutrons=210-82=128
Each of the following can be used to make observations, except: *
A calculator
A digital scale
Your sense of smell
A microscope
Answer:
Calculator
Explanation:
A calculator is used to make, well calculations
You can use a scale to get information about the weight of an object, and you can observe how weight changes in relation to size etc.
For obvious reasons, you can observe different scents
Again a microscope is an observational tool
Need help please
Which of the following physical changes shows a change in a substance’s state of matter?
A. A piece of paper being torn in half
B. Clay being molded into a bowl
C. An ice cube being crushed
D. Liquid water becoming steam
Answer:
c
Explanation:
because when you crush an ice it would break into peace's and the ice would not be a solid
negative
in your own words, why dose a car have
accelerction when it stops at a stop light?
Answer:
since it has lower mass. the force acting on it results in larger acceleration.
Define the following terms:
-hypothesis:
- theroy:
-law:
Answer:
hypothesis = A tentative explanation for a question, testable through experiments.
theory = An explanation supported by many experiments, answers "why".
law = A relationship in nature supported by many experiments.
Explanation:
A 2.00 mL sample of a substance A has a density of 18.4 g/mL and a 5.00 mL sample of
substance B has a density of 35.5 g/mL. Do you have an equal mass of substances A and
B? Explain your answer.
Answer: No, the samples are not of equal masses.
Explanation: Mass is volume X density
A: (2ml)*(18.4g/ml) = 36.8 g
B: (5ml(*(35.5g/ml) = 177.5 g
What conditions might cause a
scientist to modify
or revise a
hypothesis
Answer:
Upon analysis of the results, a hypothesis can be rejected or modified, but it can never be proven to be correct 100 percent of the time. For example, relativity has been tested many times, so it is generally accepted as true, but there could be an instance, which has not been encountered, where it is not true.
Explanation:
A car travels 4 miles in 0.08 hours. The speed of the car is miles/hr.
True or false?
1. Cells carry on the processes that keep organism live?
True or false?
2. The digestive system is in the levels of organization under organ?
A ___________
is a process that occurs when
one or more substances are changed into one or more new
substances. For example, when zinc and sulfur are mixed
together with the addition of energy in the form of heat, zinc
sulfide (ZnS) is produced.
Answer:
Reaction??
Explanation:
