Answer:
B. Experiments test the scientists' ideas.
Explanation:
Experiments helps scientist test the ideas.
Experiment is simply an act of performing a controlled test about an idea.
Before an experiment is made, observations using senses must be deduced from the environment at first.
Observations leads to the formulation of hypothesis.
Hypothesis are more or less a scientific predictions.
Most hypothesis presents variables that can be tested.
The test of a hypothesis is an experiment.
Experiments help us makes controlled test about a scientific observation in a laboratory.
The second option!
I hope this helps!
A chemist adds two substances together in a beaker. When he combines the substances, a solid substance is formed. He filters the solid substance and measures its mass on an electronic balance. When the chemist measures the mass of the substance, he is A. collecting relevant data. B. devising a hypothesis. C. making a prediction. D. drawing a conclusion.
Answer:
collecting relevant data
Explanation:
got this answer from another website ;)
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Answer:
greater than 115 N upwards
Explanation:
Each of five students used the same ruler to measure the length of the same pencil. These data resulted: 15.33 cm, 15.34 cm, 15.33 cm, 15.33 cm, 15.34 cm. The actual length of the pencil was 15.85 cm. Describe whether accuracy and precision are each good or poor for these measurements.
Answer:
Precision is good but accuracy is poor
Explanation:
The precision in a measure is about how close is a measured value to each other. In the problem, all measurements are between 15.33 and 15.34cm. Thus, you can say precision is good
And accuracy is about how close are the measured values to the theoretical or real value. The real length of the pencil is 15.85cm. The measurements are not even close of the real value. For that reason, you can sat accuracy of the measurements is poor.
The precision was good while the accuracy was poor. Precision is defined
as how close measurements are with each other.
We were told the data from the measurement was between 15.33cm-
15.34cm which shows how close the measurements are hence having a
good precision.
The accuracy is defined as how close a measurement is to the theoretical
or actual value. In this case, the actual value is 15.85cm which is far from the
values gotten from measurements hence signifying the accuracy was poor.
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There are 4.288 x 10^24 particles of sand in a bucket you
have from the beach. How many moles of sand do you
have?
Answer:
7.12 moles of sand you have in the bucket
Explanation:
Moles are defined as a determined amount of particles. To relate moles with particles it is used Avogadro's number (6.022x10²³ particles / mole).
That means in 1 mole of a determined particle you will have 6.022x10²³ particles.
As in the bucket there are 4.288x10²⁴ particles:
4.288x10²⁴ particles * (1mole / 6.022x10²³ particles) =
7.12 moles of sand you have in the bucketwhich physical property of the alkali metal group decreases down the group
Answer:
Melting and boiling point
Explanation:
For all group 1 elements, the melting and boiling point of the various members of the group decreases down the group. Hence, as the elements become heavier, they tend to have lower melting and boiling points.
Thus in moving from lithium to francium, there is a steady decrease in the melting and boiling points of elements down the group.
What is The ratio of atoms in HCI is
Answer:
Each molecule of HCl is composed of a one-to-one ratio of hydrogen and chlorine.
Explanation:
At room temperature, HCl is a colorless, poisonous gas. Dissolve it in water, and, voilà, you have hydrochloric acid. For the record, acids are substances that release hydrogen ions in water. The more hydrogen ions an acid releases in water, the stronger the acid (see "What is an ion?" below). If you concluded from the above discussion that HCl releases many hydrogen ions in water, you are right!
The ratio of atoms in HCl is
1:1The ratio of atoms in hydrogen chloride shortened as HCl is 1:1. This is because there is only one atom of hydrogen that is reacted with another atom of chlorine. A ratio indicates the relative sizes of two or more quantities.
When given another compound like H₂ SO₄, we can describe the elements as being in the ratio of 2:1:4. Thus, we can see the relative quantities of the individual elements in the given compound.
In conclusion, the ratio of atoms in HCl is 1:1.
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Which of the following is closest in meaning to the word “hypothesis”?
Fact
Law Formula
Suggested explanation
Conclusion
Answer:
suggested explanation
Explanation:
a hypothesis is like a guess to a question. then you test the guess.
The closest meaning of the word “hypothesis” is the suggested explanation. The correct option is C.
What is a hypothesis?
A hypothesis is a theory that is made by seeing a thing and explaining a description of that thing. A hypothesis must be testable according to the scientific method for it to be considered a scientific hypothesis.
Scientific hypotheses are typically based on prior observations that cannot be adequately explained by the current body of knowledge. To make a hypothesis, there is a proper observation.
The proposed explanation is a good example of a hypothesis. Because before making a hypothesis, there is a submitted explanation that will be used in proving the test.
Thus, the correct option is C. Suggested explanation regarding hypothesis.
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Three models of atomic theory are illustrated in the image. Place them in chronological order.
A)
A, B, C
B)
BAC
CAB
D)
CBA
Explain why the Bohr model was insufficient and how the quantum model explained this deficiency. How is the electron viewed differently in each model
Answer and Explanation:
Bohr's model of the atom defined the electron as a particle that orbits around the nucleus in only certain orbital levels. As a result, it couldn't readily give account of the energy levels of larger elements with high atomic number.
The quantum model of the atom however, approaches the electron in an atom as not just a particle but a wave, with its distinct quantum number per energy level. It can therefore give the position and speed of an electron simultaneously at any energy level.
I hope this explanation is sufficient.
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, and the average height of the falls is about 50 m. Knowing that the gravitational potential energy of falling water per second = mass (kg) × height (m) × gravity (9.8 m/s2), what is the power of Niagara Falls? How many 15 W LED light bulbs could it power?
Answer:
The power of Niagara falls is 1,176 Mega Watts
The number of 15 Watt bulbs it can power is 8,400,000 bulbs
Explanation:
The rate at which the water falls given as the mass flow rate = 2,400,000 kg/s
The height from which the water falls = 50 m
The gravitational potential energy (potential energy PE.) of falling water = Mass (kg) × height (m) × gravity (9.8 m/s²)
The mass of water that falls per second = 2,400,000 kg
PE. = 2,400,000 kg × 50 m × 9.8 m/s² = 1,176,000,000 Joules
The power = The rate at which the energy is generated = The amount in kg of water that fall from the height per second × The height × Acceleration due to gravity
The power = 2,400,000 kg/s × 50 m × 9.8 m/s² = 1,176,000,000 Watts
The power of Niagara falls = 1,176,000,000 Watts = 1,176 Mega Watts
The number of 15 Watt bulbs it can power = 1,176,000,000/15 = 78,400,000 bulbs
The number of 15 Watt bulbs it can power = 8,400,000 bulbs.
if 1/4 cups are in 1 serving jow many servings are in 4 cups
Answer:
One serving is 1/4 cup therefore 1 cup would be 4 servings. Since we have 9 cups we would then multiply 9 x 4 and the answer would be 36 servings. You have a ratio of cups to serving, so 1/4 cup : 1 serving, or .
Explanation:
An airplane travels 2100 km at 1000km/hE. It encounters a wind and slows to 800 km/h E for the next 1300 km. What is the average velocity of the airplane for this trip?
Answer:
The average velocity of the airplane for this trip is 1684.21 km/h
Explanation:
Average velocity is the rate of change of displacement with time. That is,
Average velocity = [tex]\frac{Displacement }{Change in time}[/tex] = Δx / Δt = [tex]\frac{x2 - x1}{t2 - t1}[/tex]
Now we will calculate the time taken by the airplane for the first motion before it encounters a wind.
From,
Velocity = [tex]\frac{Distance traveled}{Time taken}[/tex]
Time = [tex]\frac{Distance traveled}{Velocity}[/tex]
Therefore, Time = [tex]\frac{2100km }{1000km/h}[/tex]
Time = 2.1h
This is the time taken before the airplane encounters a wind.
Hence, t1 = 2.1h
Now, For the time taken by the airplane when it encounters a wind
Also from,
Velocity = [tex]\frac{Distance traveled}{Time taken}[/tex]
Time = [tex]\frac{Distance traveled}{Velocity}[/tex]
Therefore, Time = [tex]\frac{1300km }{800km/h}[/tex]
Time = 1.625h
Hence, t2 = 1.625h
Now, to calculate the average velocity
Average velocity = [tex]\frac{x2 - x1}{t2 - t1}[/tex]
x1= 2100, x2= 1300, t1= 2.1h and t2= 1.625h
Hence, Average velocity = [tex]\frac{1300 - 2100}{1.625 - 2.1}[/tex]
Average velocity = 1684.21 km/h
How are the atoms
or molecules
arranged in solid?
Answer:
Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
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13. To refine aluminum from its ore, aluminum oxide is electrolyzed to form aluminum and oxygen. At which electrode does oxygen form?
O A. Both the anode and the cathode
OB. Anode
O C. Cathode
OD. Neither electrode
Answer:
I think B
Explanation:
Answer:
Anode
Explanation:
What are the number of protons, neutrons, and electrons in an atom of Tellurium- 129?
Answer:
Number of protons = 52, Number of electrons = 52, Number of neutrons = 76
Explanation:
Can someone name an element that doesn’t match its abbreviation?
Answer:
Gold, silver and sodium.
Explanation:
Gold, silver and sodium are the name of the elements which does not match to their abbreviation. It is because those names are comes from other language. For example, the symbol of sodium is Na which comes from Natrium that is a Latin word. The symbol of gold is Au which comes from Aurum that is also a Latin word. The symbol of silver is Ag which comes from a Latin word i. e. Argentum.
What do you think the scientific question is for the
boiling water experiment
Answer:
Scientific Question: ... I will boil water and add a substance like salt to see if the boiling point increases.
While doing a lab a student found the density of a piece of pure aluminum to be 2.85 g/cm3 the accepted value for the density of aluminum is 2.70 g/cm3. What was the percent error
Answer:
THE PERCENT ERROR IS 5.55 %
Explanation:
To calculate the percent error, we use the formula:
Percent error = Found value - accepted value / accepted value * 100
Found value = 2.85 g/cm3
Accepted value = 2.70 g/cm3
Solving for the percent error, we have:
Percent error = 2.85 g/cm3 - 2.70 g/cm3 / 2.70 g/cm3 * 100
Percent error = 0.15 / 2.70 * 100
Percent error = 0.05555 * 100
Percent error = 5.55 %
In conclusion, the percent error is 5.55 %
2. Express 165,000 in exponential notation.
A) 1.65000 x 105
B) 1.65 x 10$
C) 1.6500 x 105
D) 1.65 x 105
E) 165 x 10
Answer:D
Explanation:
Move the decimal back 5 times.
What is the most dense a marble(2,56), quartz (2.64), or diamond (3.52).
Complete Question
What is the most dense a marble(2.56), quartz (2.64), or diamond (3.52).
Answer:
Diamond with a density of 3.52
Explanation:
When we say an object is dense, this means how heavy a substance or object can be.
Density can be defined as the mass per unit volume of an object of an object or a substance.
In the above question, we were given 3 substances or compounds with their respective densities:
marble(2.56)
quartz (2.64)
diamond (3.52).
We are asked to find the one that is most dense. This means we are to find the one with the highest density.
From amongst the three compounds, the most dense is Diamond with a density of 3.52.
The atmospheric pressure on a mountain is 550 mmHg and 1
atm is equal to 760 mmHg. What is the pressure in atm? Give
your answer to 2 significant figures.
Answer:
0.72
Explanation:
if 760=1
550=x
=550÷760= 0.72 in two s.f
The atmospheric pressure of the mountain will be 0.723 atm
What is atmospheric pressure?
Air is everywhere around us at due to which it touches all the surfaces due to which they possess some pressure this exerted pressure is known as atmospheric pressure which can be calculated with this formula.
1 atm = 760 mmHg
1 mmHg = 0.00131 atmosphere
Substituting the value of 1 atm in the given equation,
1mmHg = 0.00131 atmosphere
550 mmHg = 0.00131
= 550 × 0.00131
= 0.723 A T M
It is the total force exerted by the atmosphere as AIR has small molecules and every molecule is possessing some weight as when they are in bulk they form layers these layers.
As we go above on the earth the atmospheric pressure will drops due to the increase in the altitude of the earth due to which there will be less amount of oxygen.
Therefore, the pressure will be 0.723 atm.
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Question 3 0
A student has a lg sample of each of the following compounds: NaCl, Br, and KCL. Which of the following lists the samples in order of increasing number of moles in the sample?
Answer:
Option D. KBr < KCl < NaCl
Explanation:
We'll begin by calculating the number of mole of each sample.
This can be obtained as follow:
For NaCl:
Mass = 1 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mole of NaCl =?
Mole = mass /Molar mass
Mole of NaCl = 1/58.5
Mole of NaCl = 0.0171 mole
For Kbr:
Mass = 1 g
Molar mass of KBr = 39 + 80 = 119 g/mol
Mole of KBr =?
Mole = mass /Molar mass
Mole of KBr = 1/119
Mole of KBr = 0.0084 mole
For KCl:
Mass = 1 g
Molar mass of KCl = 39 + 35.5 = 74.5 g/mol
Mole of KCl =?
Mole = mass /Molar mass
Mole of KCl = 1/74.5
Mole of KCl = 0.0134 mole
Summary
Sample >>>>>>>> Number of mole
NaCl >>>>>>>>>> 0.0171
KBr >>>>>>>>>>> 0.0084
KCl >>>>>>>>>>> 0.0134
Arranging the number of mole of the sampl in increasing order, we have:
KBr < KCl < NaCl
Obtain the valence shell configuration of Al and S from their positions in the periodic table.
Answer:
Al: 3
S: 6
Explanation:
Al is in Group III. This means that it has 3 valence electrons.
S is in Group VI. This means that it has 6 valence electrons.
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Explain that the giant ionic lattices are held together by the attraction between oppositely charged ions.
Answer:
hope it helps!!!!!!!!!!!!!!!!!!!!!
Explanation:
An ionic compound is made up of charged particles, called ions. It has a giant lattice structure with strong electrostatic forces of attraction.
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3. Dorji was provided with four colourless solutions. He was asked to
identify the type of solution using universal indicator. Dorji's finding is
recorded in Table 8.5. Use the information from Table 8.5 to answer the
questions that follow.
Table 8.5.
Solution
COA
Colour change of universal indicator
Red
Blue
Purple
Yellow
en
i. What type of solutions are solution A and solution C?
ii. Which solutions do you think are:
a. acidic in nature?
b. basic in nature?
iii. What will happen if equal volume of solution B and solution D are
mixed?
Answer:
First, we can test Solution 1. We know that Sodium Hydroxide is a strong base. If we test acids on blue litmus paper, they will turn red. If we test bases on red litmus paper, they will turn blue. So, you can test all the of the solutions- water, sodium hydroxide and hydrochloric acid with blue and red litmus paper. HCl, Hydrochloric acid is an acid, so it will turn blue litmus paper red. It will not turn red litmus blue. The acids will turn blue litmus paper red. The bases will turn red litmus paper blue. Only water is a neutral liquid, which will not turn blue litmus paper red or red litmus paper blue. It will not change the colour of it. Thus, if you test all the solutions with blue and red litmus paper, you will know which solution is water. Water is the only one which is neutral. It is the only solution which cannot change the colour of any litmus paper. Thus, you can identify it very easily.
What comes right before the "analyzing the data" step of the scientific
method?
O A. Predicting a theory
O B. Testing the hypothesis
O C. Conducting an experiment
O D. Collecting the data
I need someone to answer this quickly please!!
Answer: d collect the data
Explanation:
Collecting the data and making observations comes right before the "analyzing the data" step of the scientific method. Therefore, option (D) is correct.
What is a scientific theory?The scientific method can be described as an empirical method for acquiring knowledge that has developed in science since at least the 17th century.
The scientific theory includes careful observation, applying what is observed, given that assumptions can distort how one interprets the observation. . A scientific hypothesis is possible to identify a possible outcome of an experiment that conflicts with predictions deduced from the hypothesis.
The scientific theory involves hypotheses, through induction, based on such observations, the testability of hypotheses, experimental and measurement-based statistical, and elimination of the hypotheses based on the experimental findings.
The process in the scientific method includes making hypothetical explanations, and predictions from the hypotheses as logical consequences and then conducting experiments or empirical observations based on those predictions.
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help me please it's important
At 27 C
and one atmospheric pressure, a gas has volume V. what will be its volume at 177 C
and a pressure of
1.5 atmosphere?
Explanation:
According to Charles Law :
[tex] \frac{V_1}{T_1} = \frac{V_2}{T_2} [/tex]
[tex] \frac{V}{27} = \frac{1.5}{177} [/tex]
[tex]V = 0.22 \: atm[/tex]
Identify the number of significant figures in each of these measurements of an object length: a. 76.48 cm b. 76.47 cm c. 76.59 cm
All of the measurements have 4
The number of significant figures in each of these measurements of an object's length: a. 4 b. 4 c. 4.
What are significant figures?The significant figures are the digits or numbers from zero to nine which are used to signify and specify the reporting of the measurement having uncertain digits.
Starting zero is not significant, decimal is not significant, ending zero after the decimal is significant and ending zero before and without decimal is not significant.
Therefore, a. 76.48 cm = 4 b. 76.47 cm c. = 4 76.59 cm = 4 are the number of significant figures in each of these measurements of an object's length.
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Built from amino acids
carry out most of the life-sustaining functions of the human body
Answer:
proteins carry out most of the life sustaining functions of the human body