Answer:
Independent variable: SIZE OF NAILS
Dependent variable: NUMBER OF PAPER CLIPS
Explanation:
The independent variable in an experiment is the variable that is changed or manipulated by the experimenter in order to effect a measurable response. In this investigation, the DIFFERENT SIZES OF NAILS USED is the INDEPENDENT VARIABLE.
The dependent variable is the variable that is measured in the experiment. It is the variable that responds to changes made to the independent variable. In this investigation, THE NUMBER OF PAPER CLIPS the electromagnet could pick up is the DEPENDENT VARIABLE.
The dependent variable is the number of paper clips that the electromagnet could pick up while the independent variable is sizes of nail used.
An experiment consists of;
a dependent variable and an independent variable.The independent variable is the variable that is being manipulated while the dependent variable changes with changes in the independent variable.
In this experiment, the dependent variable is the number of paper clips that the electromagnet could pick up while the independent variable is sizes of nail used.
Learn more: https://brainly.com/question/20906233
Which structure represents an organ in a plant?
A : vascular system
B: stem
C: xylem
D: chloroplasts
Answer:
the answer is stem please mark me as brainlist
Give the brainliest
Classify the following metals by increasing order of melting temperature
a) Na Li K
Classify the following metals by increasing order of melting temperature
b) Al Mg Na
Explanation:
a. K Na Li
melting point decreases a
down the group since more shells are added down the group hence the the attractive force that the protons exert on the electrons decreases down the group and hence melting point also decreases down the group.
i.e Li,Na,K decreasing order.
And hence the increasing order will be:
K Na Li.
b. Na Mg Al
Effective nuclear charge increases across the period and hence melting point increases across the period since Al Mg and Na are in the same period hence the increasing order will be Na Mg Al.
Answer:
a. K,Na,Li
b. Na,Mg,Al
Explanation:
the first one Lithium because it has small atomic size hence their is greater attraction for the electrons in the energy level ,hence the heat required to break the bond is a lot hence high melting point
the second one Aluminium has a higher mpt than Mg and Na this is because as u go along the period the nuclear charge increases hence exerts higher attraction towards the electrons in the energy levels hence the bond formed is strong hence will require more heat to break.
Which of the following best describes an ionic compound? *
a positively charged compound composed of cations and atoms
a negatively charged compound composed of anions and atoms
a neutral compound composed of protons and electrons
a neutral compound composed of cations
The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
(I hope this helped ^^)
Ionic compounds can be defined as a neutral compound composed of protons and electrons. Thus option C is correct.
An ionic compound has been formed by the transfer of electrons between atoms. The transfer of electrons will impose a charge on the atoms involved in the bond, and result in an ionic compound.
The interaction of the positively charged cations and negatively charged anions takes place. The protons are the positive charged species and electrons are the negatively charged species.
Thus, the ionic compound has been a neutral compound formed by protons and electrons. Thus option C is correct.
For more information about ionic compounds, trefer to the link:
https://brainly.com/question/9167977
what makes an atom change from one element to another
Answer:
In other words, atoms of one element can be changed into atoms of another element by transmutation. This occurs either through nuclear reactions in which an outside particle reacts with a nucleus, which can be supplied by a particle accelerator, or through radioactive decay, where no outside particle is needed.
A man is moving boxes out of a house. He uses 15 N of force to lift the box 3 m from the ground into the truck. How much work did he do?
Answer:
The answer is 45 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distanceFrom the question we have
workdone = 15 × 3
We have the final answer as
45 JHope this helps you
In general, how many valence electrons do transition metals have? (Valence are highest n, only s and p sublevel)
What ion is likely to form with transition metals? Speculate as to why you think some transition metals can form multiple ions?
Answer:
2 valence electrons.
Explanation:
Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). Most transition metals have an electron configuration that is
n
s
2
(
n
−
1
)
d
, so those
n
s
2
electrons are the valence electrons
How many grams of hydrogen (H2) form in this reaction, according to this balanced equation?
2A1. + 6HCl -> 2AlCl3 + 3h2
53.96 g 218.76 g 266.66 g ?
A. 101.86 grams
B. 6.06 grams
C. 2.02 grams
D. 539.38 grams
Answer:
B = 6.06 g
Explanation:
Chemical equation:
2Al + 6HCl → 2AlCl₃ + 3H₂
In given balance chemical equation there are 3 moles of hydrogen are formed.
Mass of hydrogen in gram:
Formula:
Number of moles = mass/molar mass
Mass = number of moles × molar mass
Molar mass of hydrogen = 1.008×2 = 2.016 g/mol
Mass = 2.016 g/mol× 3 mol
Mass = 6.05 g
It is almost equal to 6.06 g thus option B is correct.
Answer: 6.06
Explanation:
Which phrases describe sedimentary rock
sedimentary rocks are rocks that are combined from other rocks pressed into one.
What important piece of information should a sketch include in addition to the numeric dimensions?
Answer:
Bill of materials
Explanation:
which of the following elements has the greatest atomic radius?
A. potassium (K)
B. arsenic (As)
C. bromine (Br)
D. calcium (Ca)
Answer:
A. Potassium (K)
Explanation:
The trend of atomic radius goes:
As group number increases, radius decreases
As period number increases, radius increases
Answer:
francium
Explanation:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
Calculate the number of carbon atoms in a 140.0g sample of glucose (C6H12O6) . Be sure your answer has a unit symbol if necessary, and round it to significant digits.
Answer:
There are 2.81 * 10^24 atoms present
Explanation:
To get this, we need to know the number of moles present in 140gramms of carbon.
Mathematically;
number of moles = mass/molar mass
molar mass of glucose is = 180 g/mol
So the number of moles will be ;
140/180 = 0.7778 mole
1 mole of glucose contains 6 moles of carbon;
so 0.7778 moles will contain = 4.667 moles
Mathematically, the number of atoms in 1 mole is 6.02 * 10^23 atoms
The number of atoms in 4.667 moles will be :
4.667 * 6.02 * 10^23 = 2.81 * 10^24 atoms
Calculate the quantity of heat in joules required to completely vaporize 100 grams of H2O() at 100.°C and 1.0 atm.
The quantity of heat : 226,000 J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Also can be formulated :Q = m. Hf
Hf = heat of fusion
Heat required for vaporize /evaporated can be calculated from
Q = m . Hv
m = mass, g
Hv = the heat of vaporization, for water = 2,260 J/g
So :
[tex]\tt Q=100\times 2,260=226,000 J[/tex]
A container of nitrogen gas has a volume of 34 mL at 95 mm Hg. What is the new pressure if the gas volume increases to 55 mL?
Answer:
The answer is 58.73 mmHgExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
So we have
[tex]P_2 = \frac{95 \times 34}{55} = \frac{3230}{55} \\ = 58.72727272...[/tex]
We have the final answer as
58.73 mmHgHope this helps you
which element has a negative oxidation number?
N
CI
AL
Xe
Answer:
Im pretty sure its Cl but that might be wrong
Explanation:
I looked on the web for this one
which of the following are the three states of matter. A animals, plants and stars B earth, wind and fire C solid liquid and fire D liquid, gas and solid
Answer:
D
Explanation:
Solid , Liquid and Gas
Answer:
D. liquid, gas, and solid
Hope I helped!
Explanation:
define avagrados law
What element has 3 times the atomic number as beryllium?
Answer:
Magnesium (Mg)
Explanation:
Beryllium has an atomic number of 4
4 times 3 is 12
Magnesium has an atomic number of 12
plsss help me with this question
Answer:
population growth increases.
What substance makes lemon juice vinegar and soda
Answer:
Sodium bicarbonate or baking soda
Explanation:
Alkanes are hydrocarbons that contain
a.
single covalent bonds only.
c.
carbon and oxygen only.
b.
single or double covalent bonds.
d.
carbon, hydrogen, and oxygen.
Please select the best answer from the choices provided
A
B
C
D
Please hurry!!!
Answer:
single or double covalent bonds
Explanation:
What is mass of 3.5 moles of LiOH?
Answer:
84
Mass = moles x molecular mass of LiOH
= 3.5 x 24
= 84 g/mol
What is the basis for analyzing an energy transfer diagram?
What would be an adaptation for living in the tundra
Answer: you would hace to adapt to the climate
Explanation:
Answer: Migration and hibernation are examples of behavioral adaptations used by animals in the Arctic tundra. The fact that many animals do not live year-round in the tundra means they leave or migrate for a length of time to warmer climates.
Imagine a campfire on a cold day. At first, the temperature of each log is as cold as the air around it. A few hours after the fire has burned out, the temperature of the ashes will also be cold. But in between, when the fire is burning, the temperature of the logs and surrounding air is very hot. What is the source of this thermal energy? For the answer, begin by identifying the reactants and products for the overall chemical reaction of burning wood. Wood is mostly carbohydrates, the bulk of which is cellulose. Cellulose is made up of hundreds to thousands of glucose groups connectected by oxygen molecules. The chemical formula for cellulose is (C6H12O6)n, where n is the number of glucose groups. For more manageable models, carbohydrates will be modelled as glucose with a chemical formula of C6H12O6.
Answer:
See explanation
Explanation:
From the statement of the first law of thermodynamics, energy is neither created nor destroyed, but is transformed from one form to another.
Thermal energy is possessed by the hot air while the fire is burning. This thermal energy was obtained from the chemical energy stored in carbohydrates(cellulose) that is present in wood material. As the combustion proceeds, chemical energy stored in chemical bonds of the wood material converts into thermal energy (heat energy). The chemical reaction involved in the combustion of wood can be simplified as shown below; n represents the number of glucose units that combine to make up the cellulose present in the wood material.
nC6H12O6(s) + 6nO2(g) ===> 6nCO2(g) + 6nH2O(g)
n may even be as much as thousands of glucose units.
3. If the distance between two ions of the same charge is increased, what will happen to the energy of interaction between the ions? Why?
Answer:
The electrostatic attraction energy between ions of opposite charge is directly proportional to the charge on each ion (Q 1 and Q 2 in Equation 4.1. 1). Thus, more energy is released as the charge on the ions increases(assuming the internuclear distance does not increase substantially).
Hai people. Can you answer this for me?
Rain occurs when water vapor _____.
thxs!
Rain occurs when water vapor _condensates____.
sorry if I'm wrong
Answer:
turns into clouds it cools and condenses
proton is not affected by a magnet true or false
Answer:
true
Explanation:
negatively charged electrons are affected by the magnetic field.
Answer:
false
Explanation:
It isn't affected because nothing makes it change and the number stays the same
Which description refers to cumulus clouds?
are fluffy
form layers
are usually gray
cover most of the sky
Answer:
Are fluffy.
Explanation:
Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Their name derives from the Latin cumulo-, meaning heap or pile. ... Cumulus clouds may appear by themselves, in lines, or in clusters.
Which of the following is a Hemipteran?
Tarantula Hawk
Silverfish
June Bug
Cicada
Answer:
I think it's D, cicada.
According to Oxford, a Hemipteran is "an insect of the order Hemiptera, such as an aphid, cicada, or leafhopper."
Hope this helps! I also hope it's not wrong, but I do not think it is.
Also please let me know if this is correct.
Sarah backstrokes at a speed of 8 meters per second, how long will it take her to complete the race of 200 meters length?
Answer:
I think it would take her 25 Seconds
Explanation:
To calculate how long it would take for Sarah, I did 200 divided by 8. When I did that, I got 25 as my answer. I'm not exactly sure if it would be in seconds or minutes, but I feel that seconds is more reasonable. I hope this helps, and I hope it's not wrong, but I do not think it is.
