Answer:
1 significant figure
Explanation:
3×10^6 is 3,000,000
Non-zero digits are always significantAny zeros between two significant digits are significantA final zero or trailing zeros in the decimal portion ONLY are significantExample: .500 or .632000 the zeros are significant
.006 or .000968 the zeros are NOT significant
which element is a liquid at 1000 K
Answer:
it is aluminum (Al)
Explanation:
what is the basis of modern periodic table?
Explanation:
The periodic table is an arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations and recurring chemical properties.
Different microscopic organisms cause different
diseases. When a dangerous microscopic organismis
transferred from one person to many people the
disease it cames will spread
Why is this considered a theory instead of a hypothesis
or a law?
Answer/Explanation:
A theory has lots of scientific evidence to back it up. We know this to be true based on lots of different diseases and studies of their spread.
A hypothesis is more of a starting point - an educated guess based on limited evidence. It requires further testing before becoming a theory.
A law is something that can be generalized to lots of contexts, and is universal. Such as the law of thermodynamics.
Which classification best describes oxygen gas? a element b compound c solution d heterogeneous mixture
Answer:
oxygen is an element because it is a pure substance which cannot be split into simpler substances by chemical means
Spongebob completed his experiment. He wrote a brief summary about the investigation. He also determined that his hypothesis statement was not right and explained why it wasn't right by providing evidence from the investigation. Spongebob utilized which step of the scientific method?
Answer:
In a 7-step scientific method, Spongebob utilized the 6th step when He wrote a brief summary of the investigation, and Spongebob utilized the 7th step when He also determined that his hypothesis statement was not right and explained why it wasn't right by providing evidence from the investigation.
Explanation:
Scientific Methods are organized ways employed by scientists to tackle problems by providing solutions to the problem or make hypotheses to which other scientists build on to provide solutions to the problem.
The steps of the scientific method are:
Step 1- Understand the Problem
Step 2- Make research
Step 3- Hypothesis.
Step 4- Conduct an experiment to test the hypothesis
Step 5- Observations.
Step 6-Results/Conclusion.
Step 7- Communicate your research
When Spongebob wrote a brief summary of the investigation, which means he had already conducted an experiment and had already made necessary observations and data collection, so he was at step 6. At step 6, he had analyzed the data collected.
When Spongebob determined that his hypothesis statement was not right and explained why it wasn't right by providing evidence from the investigation, then he was at the final step of the scientific method. Step 7 tells whether the hypothesis is true or false.
Answer:
hey im spongebob
Explanation:
:D
Which unit is not a measurement of volume?
cm^3
Ocm
Oml
OL
Answer:
cm is a measure of length not volume
Answer:
I think it's Cm:)
Hope this helps
What are covalent bonds
Answer:
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding
BRAINLIEST
Why are electron filling orders not the same between the first and the last two elements of group 6B?
Answer:
This primarily has to do with the balance of energy between the orbitals. The aufbau principle states that the order of energy regarding electrons in the orbitals from lowest to highest is so the electron in the atom will minimalize it's energy. Periods on the periodic table are based on the energy level while the groups have the same amount of valence electrons. The outer orbitals are refered to as shells. The elements are particularly arranged depending on their atomic and molecular orbitals. Valence electrons most determine the chemical properties of an element. The atomic number is based on the number of protons.please help me!! thank you so much!!
Answer:
13.75
Explanation:
gets halved every 8 days so halved twice
what happens to the pen?what could have caused the pen's motion?
grade 8 asap
Answer:
One is tension force that acts on the string and the other one is gravitational force that is acting on the pen and is therefore, the one that pulls the pen towards the ground. Therefore, the pen's motion is caused by the unbalanced force acting on the pen.
Which statement best describes a physical change?
Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.
Answer:
Physical changes can include changing the colour, shape, state of matter, or volume of a substance.
what is the first step of scientific method A.Hypothesis
B. question
C.control
D.procedures
Answer:
B
Explanation:
Question. You need to ask questions before you can set up to perform an experiment.
Hydrogen is in column 1 of the periodic table. What information does this give us? (2 points)
There is one other element that hydrogen will bond with.
There is one neutron in the nucleus.
The mass of the atom is one.
There is one electron in the outer energy level.
Answer:
the last one
Explanation:
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Because hydrogen forms compounds with oxidation numbers of both +1 and -1, many periodic tables include this element in both Group IA (with Li, Na, K, Rb, Cs, and Fr) and Group VIIA (with F, Cl, Br, I, and At).
There are many reasons for including hydrogen among the elements in Group IA. It forms compounds (such as HCl and HNO3) that are analogs of alkali metal compounds (such as NaCl and KNO3). Under conditions of very high pressure, it has the properties of a metal. (It has been argued, for example, that any hydrogen present at the center of the planet Jupiter is likely to be a metallic solid.) Finally, hydrogen combines with a handful of metals, such as scandium, titanium, chromium, nickel, or palladium, to form materials that behave as if they were alloys of two metals.
There are equally valid arguments for placing hydrogen in Group VIIA. It forms compounds (such as NaH and CaH2) that are analogs of halogen compounds (such as NaF and CaCl2). It also combines with other nonmetals to form covalent compounds (such as H2O, CH4, and NH3), the way a nonmetal should. Finally, the element is a gas at room temperature and atmospheric pressure, like other nonmetals (such as O2 and N2).
It is difficult to decide where hydrogen belongs in the periodic table because of the physical properties of the element. The first ionization energy of hydrogen (1312 kJ/mol), for example, is roughly halfway between the elements with the largest (2372 kJ/mol) and smallest (376 kJ/mol) ionization energies. Hydrogen also has an electronegativity (EN = 2.20) halfway between the extremes of the most electronegative (EN = 3.98) and least electronegative (EN = 0.7) elements. On the basis of electronegativity, it is tempting to classify hydrogen as a semimeta
What type of mixture is separated by effusion and condensation?
a.
Liquid
c.
Gaseous
b.
Solid
d.
Combination of liquid and solid
Answer:
c is the answer then check it out
please helppp!!!
Consider the following intermediate chemical equations.
C(s) +202(g) → CO(g)
CO(g)+302(g) → CO2(g)
How will oxygen appear in the final chemical equation?
O O2(g) as a product
O O2(g) as a reactant
O O(g) as a product
O 20(g) as a reactant
O₂(g) as a reactant
Further explanationIn chemical reactions, there is a reaction between reagents and products
Reaction:
aA + bB ⇒ cC
Substances A and B are called a reactants
Substance C is called a product
In the above reaction:
Reactants: C, O₂ and CO Products: CO and CO₂CO functions as a product in the first reaction and functions as a reactant in the second reaction
In the final chemical equation :
CO(g)+30₂(g) → CO₂(g)
O₂ is on the left so it is called the reactant
Answer: B. O₂(g) as a reactant
someone please i need help
Answer:
the answer 32/43
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other, the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
So,
The direct rule of three is the rule applied in this case as follows: If the change in water level is 0.05 inches per hour, what is the change in water level after 24 hours?
change in water level=1.2 inches
To pass a decimal number to a fraction, you must:
Put the decimal number in a fraction above a 1. That is, the decimal number is the numerator, 1 the denominator.
Find an equivalent fraction. That fraction will carry in the denominator a 1, an
Finally, the change in the water level of the pond after 24 hours is 1.2 inches or what is the same inches
Which hypothesis is testable using a scientific experiment?
A. A fried egg is better than a hard-boiled egg.
B. Brown eggs are more attractive than white eggs.
C. Eggs with large yolks are more expensive than eggs with small
yolks.
D. You can boil an egg faster at high altitudes than at sea level.
pls help me with this question
Answer:
I think its a and c
Explanation:
im smrt
What is the role of
electrons within an
atom?
A.
Electrons are in the nucleus and have a
negative charge
B. Electrons are in the nucleus and have a
positive charge
C. Electrons are outside the nucleus and
have a negative charge
D. Electrons are outside the nucleus and
have a positive charge
Option C - Electrons are outside the nucleus and and have a negative charge is the correct alternative.
We have electrons.
We have to determine their role inside the atom.
What are Electrons ?An electron is one of the subatomic particles within an atom. It is negatively charged particle whose magnitude is 1.6 x 10⁻¹⁹ C.
According to the question -
The role of electrons inside the atom is as follows -
Electrons revolve around the nucleus.They carry a negative - charge of -1.6 x 10⁻¹⁹ C.Hence, Option C is the correct alternative.
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How would you determine an atom's charge?
Answer:
The charge of an atom is the number of protons minus the number of electrons.
HELP!!!! PLEASE, it would be much appreciated.
d it is made of cells
Explanation:
because it is the one that makes most sense
A plant's growth response to water is called _____.
hydrotropism
geotropism
gravitropism
thigmotropism
Answer:
A or Hydrotropism
Explanation:
Answer:
hydrotropism Explanation:
because hydro= water and topism= the turning part of an organism hope this helps!! <3
After a particularly fierce blow, he crawled to his feet, too dazed to rush. . . . All the pain he had endured was as nothing compared with the exquisite agony of this. With a roar that was almost lionlike in its ferocity, he again hurled himself at the man. But the man, shifting the club from right to left, coolly caught him by the under jaw, at the same time wrenching downward and backward. Buck described a complete circle in the air, and half of another, then crashed to the ground on his head and chest.
What is the man’s role in this excerpt?
The man is the protagonist because he is the main character.
The man is the protagonist because he proves his superior strength.
The man is the antagonist because he reveals his cruel nature.
The man is the antagonist because he is opposing Buck.
Answer:
D. The man is the antagonist because he is opposing Buck.
Explanation:
I just took the quiz.
can there be a negative number answer in a combined gas law problem
saturn is about 1 429 000 km from the sun. how many meters is saturn from the sun?
Answer:
1.493 trillion
Explanation:
Answer:
you must convert km to meters
Explanation:
How could the combustibility of a substance influence how the substance is used?
Answer:
Combustibility is a measure of how easily a substance bursts into flame, through fire or combustion. This is an important property to consider when a substance is used for construction or is being stored. It is also important in processes that produce combustible substances as by product
Which periodic gruop has the smallest atomic radiis
Answer:
Helium
Explanation:
The explosions that take place during a fireworks show are an example of which of the following? (2 points)
Image of fireworks exploding in air
Chemical change
Chemical property
Physical change
Physical property
Answer:
Chemical Change
Explanation:
The explosion of fireworks is an example of chemical change. During a chemical change, substances are changed into different substances. In another words, the composition of the substance changes.
i need help and it’s for science cause i have a bad grade in it and have 3 days to get all my grades up so help pls?
How many nitrogen atoms are in the chemical
formula below?
5C8H10N402
Answer:
4 ATOME nitrogen in the formula
There are 20 nitrogen atoms in the chemical formula mentioned.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.They are used to describe the chemical reactions.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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