13. when "doing science" using the scientific method, which of these would be at the top of the list? this is about science, lesson 5 unit 1 the scientific method, pl help me, I have a bad grade an I want to get this right, this assignment is worth 68 eight points for Connexus.
Answer:
make an observation
Explanation:
Answer:
OBSERVING AND QUESTIONING
Explanation:
when you use the scienfic method the first thing you have to do is question you theory and coming up with a hypothesis which is what you expect to happen
3. In which reaction is the volume of the products equal to the volume of the
reactants?
A 2H2(g) + O2(g) → 2H2O(g)
B 3H2(g) + N2(g) → 2NH3(g)
C N2(g) + O2(g) → 2NO(g)
D 2502(g) + O2(g) → 2503(g)
Answer:A
Explanation:
True or false 1. A scientific model is representation of a particular phenomena
using something to make it easier to understand.
Answer:
True
Explanation:
The given statement is true.
A scientific model is defined as the mathematical and physical representation of a process or event. Scientists perform several observations or experiment and find a connection between them to prove a scientific finding.
A scientific model has the ability of explanatory power which helps to make things easier to understand using diagrams and consistency across contexts. Testing and prediction power in scientific models leads to strong predictions and able to convince people using an appropriate model.
Hence, the correct answer is "true".
During ionization, water molecules disrupt the ionic bonds of a salt to produce a mixture of ions. These ions can carry a current and so are called
Answer:
Electrolytes
Explanation:
Electrolytes are minerals in your body and balance the amount of water in your body. In this case, it balances the water from the salt by producing a mixture of ions.
Electrolytes are the ions formed when water molecules shatter the ionic bonds of a salt and can conduct an electric current.
Electrolytes are compounds that create ions and may conduct electric current when dissolved in water or melted. These ions may carry electric charges and let electrical energy flow through a solution or molten solid.
Electrolytes are compounds that breakdown into ions when dissolved in water or melted. The presence of these ions permits electricity to pass through the solution or molten material.
Thus, electrolytes are classified as either strong, which entirely breakdown into ions, or weak, which only partially dissociate. Salts, acids, and bases are examples of common electrolytes.
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1) Two clear solutions are placed in separate beakers. The first solution has a pH = 4, and the pH of the second solution is unknown. If the two solutions are mixed and the resulting solution has a pH = 7, describe the second solution.
Answer:
pH = 10
Explanation:
pH = -log [H⁺]
A solution that is pH = 4 has a [H⁺] = 1x10⁻⁴M
As the mixture of the two solutions is pH = 7 (Neutral). The second solution must contain the exact amount of OH⁻ to neutralize the H⁺ of the first solution. That is [OH⁻] 1x10⁻⁴
And as pOH = -log [OH⁻]
pOH = -log 1x10⁻⁴
pOH = 4
Also, pH = 14-pOH
pH of the second solution must be:
14 - 4
pH = 10During what part of the experiment is the hypothesis "judged" as being rejected or supported?
Answer:
null
Explanation:
the hypothesis is a typical statistical theory which suggest that no statistical relationship and significance exists in a set of a given single observed variable between two sets of the observed data and measured phenomena
What is the mass of the object?
Answer:
37.3
263.5
Explanation:
The scale measures hundreds of units, tens of units, units, and parts of units (1 decimal place.
Scale 1
Hundreds 0 * 100 = 0
Tens: 3 * 10 = 30
Units: 7 * 1 = 7
1/10 unit = 3* 0.1 = 0.3
Total 30 + 7 + 0.3 = 37.3
Scale 2
Hundreds 2 * 100 = 200
Tens: 6 * 10 = 60
Units: 3 * 1 = 3
1/10 unit = 5* 0.1 = 0.5
Total = 200 + 60 + 3 + 0.5 = 263.5
If a neutral copper atom becomes an ion that has a charge of 2+, how many electrons does the resulting ion have?
a31
b27
c29
d28
The resulting copper ion has 27 electrons.
Copper ions:The Copper atom has an atomic number 29.
This means that the neutral Copper atom has 29 electrons and 29 protons.
Now, the copper ion with 2+ charge means that the copper ion has an extra positive charge. This extra positive charge is due to the loss of electrons.
When the copper atom loses electrons, the number of electrons in the atom is less than the number of protons, therefore, the charges are not balanced.
For a copper ion with 2+ charge, the neutral copper atom must has lost 2 electrons.
So, now the copper has 29 - 2 = 27 electrons.
The resulting ion has 27 electrons and 29 protons.
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A neutral atom has an equal number of positive and negative charges. If a neutral fluorine atom has 9 protons and 10 neutrons, how many electrons will it have?
The number of electrons should be 9.
Given that,
If a neutral fluorine atom has 9 protons and 10 neutronsCalculation of a number of electrons:
= Number of protons = Number of electrons
9 = Number of electrons
Therefore,
Number of electrons = 9
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Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:
Answer:
Radioactive
Explanation:
They're more unstable than my home life
A graduated cylinder contains 20.0 mL of water. After a rock is placed in the cylinder, the level rises as shown below. What is the volume of the rock?
Answer:
The correct answer is 14 cm³.
Explanation:
Based on Archimedes Principle at rest when a body is completely or partially immersed within a fluid, it encounters a vertical thrust, which is equivalent to the weight of the fluid that the body displaces. In the mentioned case, the fluid is water. Thus, the rock being denser will result in the displacement of water, making the level of water to ascend in the cylinder.
Thus, if V₁ or the initial volume is 20 ml or 20 cm³, and after insertion of the rock, the rise in the level of water becomes V₂ as 34 ml or 34 cm³. Then the volume of the rock will be,
V = V₂ -V₁ = 34 - 20 = 14 cm³.
What is the difference between ions and isotopes?
Can someone answer this please thank you ! Need it ASAP !
What is the solution to the problem rounded to the correct number of significant figures?
12.77 + 0.8 = ?
Answer:
13.57 approximately 14
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide? (5 points)
Oa
Carbon and oxygen are chemically bonded in it.
Oь
Carbon and oxygen retain their original identity in it.
It can be separated into carbon and oxygen using physical methods.
Od
The proportion of carbon and oxygen is different in different samples of the gas.
Answer:
The proportion of carbon and oxygen is different in different samples of the gas.
Q3: What fundamental unit of the metric system always has a prefix in front of Write your answer here
Answer:
prefix kilo
Explanation:
Hope this helps.......
Why does every sample of water have the same boiling point?
Answer:
beacuse water is same every where because it is the combination of h2 +o2 h2o which doesn't change while it is different
Explanation:
ok
Which contributes to the lack of evidence of the Period of Heavy
Bombardment on Earth?
The correct answer to this would be:
Earth’s volcanoes
Together with weathering and plate tectonic movements, Earth’s volcanic eruptions and emission of lava has destroyed/covered many of the craters which were created on Earth during the Period of Heavy Bombardment.
IamSugarBee
The correct answer to this would be letter:
A. Earth’s volcanoes
Together with weathering and plate tectonic movements, Earth’s volcanic eruptions and emission of lava has destroyed/covered many of the craters which were created on Earth during the Period of Heavy Bombardment.
Which of the following is a physical property ? A. Being black in color B. A toxic acid C. burning with oxygen D. Releasing SO2 gas
Answer:
A. Being black in color
Explanation:
Physical properties are properties that can be observed without having to change the chemical composition of the substance.
So, an observation about the color of the object would be physical.
Therefore, A is correct because there are no chemical changes involved, while the other 3 answer choices involve some type of chemical change.
Answer:
Being black in color.
Explanation:
It is something you can see with one of your 5 senses.
Lead has a density of 11.3 g/mL. If you have 105 grams of lead,
what is the volume in milliliters?
Remember to select an answer with the correct number of
significant figures.
Answer:
Volume = 9.29 mLExplanation:
Density of a substance can be found by using the formula
[tex]Density( \rho) = \frac{mass}{volume} [/tex]
From the question
Density = 11.3 g/mL
mass = 105 g
Substitute the values into the above formula and solve for the volume
That's
[tex]11.3 = \frac{105}{v} [/tex]
Cross multiply
11.3v = 105
Divide both sides by 11.3
[tex]v = \frac{105}{11.3} [/tex]
v = 9.29203
We have the final answer as
Volume = 9.29 mLHope this helps you
which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior
Solve the following, observing significant figure
rules
1 355.24 g -
0.954 g
Answer:
355.24 - 0.954 = 354.29
Sig Figs = 5
Decimals = 2
Scientific Notation ;
[tex]3.5429 \times 10^2[/tex]
Explanation:
How do you separate alcohol and water ?
Answer:
liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.
Explanation:
hope this helps :3
Explain the similiarities and differences between combustion and food digestion?
Answer:
Digestion is not an example of combustion. Digestion is an endothermic process where energy is utilized to break down the complex food molecules into simple forms. In a combustion reaction carbon dioxide,water,energy and some by products are released.
Explanation:
Which of the following combustion reactions is balanced correctly?
O A. C5H12 + 402 → 5C02 + 3H20
O B. C5H12 + 402 → CO2 + 6H20
O C. C5H12 + 802 → 5002 + 6H20
O D. C5H12 + 5.502 → 5CO2 + H20
Answer:
c
Explanation:
The chemical equation which is balanced is C₅H₁₂+ 8 O₂ [tex]\rightarrow[/tex] 5 CO₂ + 6 H₂O which is a combustion reaction.
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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To find the density of an irregular object, what method should be used?
Answer:
You can find the volume of an irregular object by immersing it in water in a beaker or other container with volume markings, and by seeing how much the level goes up. You can use this relation backwards too -- if you know what material an object is made of, you can look up its density in a book. hOPE THIS HELPS! =)
05. When a gold pebble is placed in a graduated cylinder that contains 12.0 mL of water, the water level rises
to 19.4 ml. What is the mass of the gold pebble? [The density of gold is 19.3 g/cm]
Answer:
142.82 g
Explanation:
The following data were obtained from the question:
Volume of water = 12 mL
Volume of water + gold = 19.4 mL
Density of gol= 19.3 g/cm³
Mass of gold =.?
Next, we shall determine the volume of the gold. This can be obtained as follow:
Volume of water = 12 mL
Volume of water + gold = 19.4 mL
Volume of gold =.?
Volume of gold = (Volume of water + gold) – (Volume of water)
Volume of gold = 19.4 – 12
Volume of gold = 7.4 mL
Finally, we shall determine the mass of the gold as follow:
Note: 1 mL is equivalent to 1 cm³
Volume of gold = 7.4 mL
Density of gol= 19.3 g/cm³ = 19.3 g/mL
Mass of gold =?
Density = mass /volume
19.3 = mass of gold /7.4
Cross multiply
Mass of gold = 19.3 × 7.4
Mass of gold = 142.82 g
Therefore, the mass of the gold pebble is 142.82 g
What is the mass of a 12.31 cubic centimeter piece of copper having a density of 8.96 grams/ cubic centimeter?
m ≈ 110.30 grams
Explanation:d = m/V
m = d×V
m = 8.96g/cm³×12.31cm³
m = 110.2976
m ≈ 110.30 grams
Answer:
[tex]\Huge \boxed{\mathrm{110.2976 \ grams}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]\sf \displaystyle density = \frac{mass}{volume}[/tex]
[tex]\displaystyle \rho = \frac{m}{V}[/tex]
Solving for the mass.
[tex]m = \rho \cdot V[/tex]
The density of the copper piece is 8.96 g/cm³.
The volume of the copper piece is 12.31 cm³.
[tex]m = 8.96 \cdot 12.31[/tex]
[tex]m= 110.2976[/tex]
The mass of the copper piece is 110.2976 grams.
[tex]\rule[225]{225}{2}[/tex]
Mercury has a density of
13.55 g/mL .What would be the volume of a 122 g sample?
Answer:
V = 9.0037
Explanation:
V = M/D
V = 122/13.55
V = 9.0037
what is the symbol of mercury
Answer: Hg
Explanation:
The symbol of Mercury is Hg drived from Hydra gayrum
name two noble gasses
Answer:
The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
Explanation: