A chemical reaction is when substance are changed into other substances.
True or False
Answer:
True
Explanation:
coz it is when one or more substances are mixed to produce one substance
Answer:
true
Explanation:
when its asking for a chemical reaction its asking for if it changed or had any effects like changing color or having weird effects on things it is mixed with or touches so its true
Darwin observed __________________ types of mockingbirds and finches lived in different island environments.
Answer:
Darwin observed many different types of mockingbirds and finches lived in different island environments.
does The Bohr model of the atom correctly predicts the energy levels of the hydrogen atom, which has a single electron.
Answer:False. The Bohr model correctly predicts energy levels of hydrogen and hydrogen-like atoms.
Explanation:
Element Dy has 3 known isotopes. If.2% of the sample has a mass of 160
amu, .06% has a mass of 160.9 amu and the remaining has a mass 162
amu, what is the predicted mass of Dy?
Answer:
this girl in my class is getting a dog
Explanation:
but shes annoying so im hit her
1) Calculate the average speed in meters/minute for the trip represented
by the walk graphed here.
e
A) 0.5m/min
B) 1m/min
C)
5m/min
nber as you
D) 30m/min
has only
quantity and has
2) What is the average velocity of the person taking this walk?
Answer:
in physics we never work with minutes only seconds.
How does energy move through a wave? 3 evidence and reasons supporting you answer.
the largest source of anthropogenic greenhouse gases in the united states is
Answer:
Human activities are responsible for almost all of the increase in greenhouse gases in the atmosphere over the last 150 years. The largest source of greenhouse gas emissions from human activities in the United States is from burning fossil fuels for electricity, heat, and transportation.
A. An atom neutral (one with 0 extra charge)?
Answer:
Neutron is the correct answer.
Astronomers often scan the sky using devices called radio
telescopes. What can you conclude about these devices?
Answer:
A radio telescope is simply a telescope that is designed to receive radio waves from space.
radio telescopes helps to study naturally occurring radio light from stars, galaxies, black holes, and other astronomical objects. We can also use them to transmit and reflect radio light off of planetary bodies in our solar system.
Answer: stronomers often scan the sky using devices called radio telescopes. What can you conclude about these devices? ... They pick up the radio waves emitted by stars.
what is the electron configuration of a n3- anion?
Answer:
You can see in the above illustration of the periodic table that N is in Period 4, Group 5A, and p-block. Before reaching N, you will pass through the atomic orbitals 1s, 2s, and 2p. The electron configuration of N3- is N3-: 1s22s22p6 .
Explanation:
What is the relationship between the concentration and the rate of the reaction?
negative
neutral
positive
Answer:
When the concentration of all the reactants increases, more molecules or ions interact to form new compounds, and the rate of reaction increases. When the concentration of a reactant decreases, there are fewer of that molecule or ion present, and the rate of reaction decreases.
Answer:
Negative
Explanation:
Which ion has the correct charge?
07-
Na 2+
N 3+
Ca2+
Answer:
Ca(2+)
Explanation:
Sodium (Na) only have one valence electron and will lose it in order to gain a full octet. There will be an unbalance of electrons and protons where there are more protons there electrons. The correct ion formula for sodium is Na (1+).
Nitrogen has 5 valence electrons and will gain three more to gain a full octet. There will be an unbalance where there are more electrons then protons. Nitrogen will form the ion N (3-).
Calcium has two valence electrons and will lose them in order to gain a full octet. There will be an unbalance where there are more protons then electrons. Calcium will form the ion Ca 2+
Therefore, Ca2+ is the ion with the correct charge.
If you have a ring that contains 1.94 g of gold, how many atoms of gold are there in the ring?
please help me with the second image questions it is really important and I really need it please help me out and provide me the answers for the second image two questions, looking at the first image please.
Answer:
is this exam.. are you coping..
HURRY
What type of reaction is this? 2H2 + O2=>2H 20 + Energy
A. Exothermic reaction
B. Endothermic reaction
C. Chemical reaction
D. Nuclear reaction
Answer: Both A and C
Explanation:
It is a combustion reaction that is exothermic. It is a chemical reaction. Choices A and C are both correct, so I'm not certain what criteria are most important in answering.
What role do insects play in the fertilization process?[Bees]
AThey transport seeds from trees to the groundincorrect answer
BThey collect nectar from the interior parts of plantsincorrect answer
CThey deliver pollen from the stamens of plants to the ovaries of other plantsincorrect answer
DThey eat fruit, exposing the seeds so that they can sprout and grow
Answer:
C. They deliver pollen from the stamens of plants to the ovaries of other plants
Explanation:
hope this helps :)
Please help I will Mark Branlist
please justify and explain aswell
A. ionic (donates an electron to the other atom in the bond)
B. covalent (electrons are shared equally)
C. polar (unequal electronegativity)
hope this helps!
To form a charge of +2 an atom must________electrons.
To form -3 it must ________ electrons.
Multiple choice:
1) gain2 ;lose 3
2) gain3: lose2
3) lose2;gain3
4) lose3; gain2
Answer:
Explanation:
3
Vinegar is an ingredient commonly used by chefs. Scientists also use it as well, although they call it acetic acid. When vinegar is in its liquid or solid (frozen) states, it has a fixed volume. But when vinegar is in its gas state, it takes up the entire volume of whatever container it is in. This is why you can smell an open bottle of vinegar the minute you walk into a kitchen, even though you cannot actually see the gas particles!
Which statement best explains why the volume of vinegar gas is changeable as opposed to the fixed volume of its solid and liquid states?
A. Gas particles are always at a higher pressure than solids and liquids.
B. Gas particles are always at a higher temperature than solids and liquids.
C. Gas particles are spaced far apart and can move freely.
D. Gas particles stay close together but can move around each other.
Answer: C
Explanation: Because gas particles are free to move fast where as liquid can move a little but solid cant so it would be C
Hope it helps
EASY QUESTION (PLEASE HELP THE INTERNET ISN'T SUCH A BIG HELP RIGHT NOW)
Things microscopes have helped scientists discover about cells.
(No links plz)
Answer:
Microscopes allowed scientists to observe Prokaryotic cells which make up Bacteria and Archaea.
What is the best way to torture an ant
strong salt solution
normal salt wouldnt work becaue unlinke slugs they have a waterproof skin
PLEASE HELP ASAP 30 POINTS!!!!
Voltage ______
Question 1 options:
causes current
pushes free electrons around a circuit
is measured in Volts
all of the choices
how long to bring cream cheese to room temperature?
Answer:
about an hour but it might take a little longer it jist depends
Which two statements describe a claim that is based on science?
A. It is based on logical reasoning.
B. It is based on empirical evidence.
C. It is based on personal bias.
D. It is Based on a long tradition.
Answer:
A AND B
Explanation
Personal bias and tradition have nothing to do with true scientific CLAIMs. We reach the truth by careful observations and logical reasoning (see Sherlock Holmes).
so
A AND B
the primary difference between enhancers and promoter-proximal elements is that enhancers _____.
Answer:
Enchancers are transcription factors
I hope that helps you
How many molecules are there in 3.1 mol CO2
Answer:
Abs : 1.8662 × 10^24
Explanation:
1 mol of CO2 contains 6.02 × 10^24 molecules
So, 3.1 mol of CO2 contains 6.02 × 10^24 × 3.1 mol = 1.8662 × 10^24
how might rising atmospheric co2 concentrations lower the ph of the oceans?
Explanation:
As CO2 concentrations rise, excess CO2 is absorbed by the oceans. CO2 in the oceans can react chemically with water to form acid. ... The difference in pH units between two acidic solutions is three.
(will mark brainliest if ou give me the right answer!!!!)
You observe your friend rub a balloon on their wool sweater and then stick it to the wall. To investigate, you set up an experiment to test whether other objects will respond in the same way when you rub them against a sweater. What is the test variable in your experiment?
A. The number of times you rubbed the object on the sweater
B. The observation that the object sticks to the wall
C. The sweater you use to rub against the objects
D. The type of objects you are testing in the experiment
Answer:
D
Explanation:
BEcause you are testing which objects will stick. Your control variable will be the sweater. And the number of times you rub the object on the sweter will not make it stick. It will make it stick for a longer period.
Answer:
D. The type of objects you are testing in the experiment
A compound is 2. 00% H by mass, 32. 7% S by mass, and 65. 3% O by mass. What is its empirical formula? The third step is to calculate the mole ratios of the elements present. To do this, you will divide each molar amount by the smallest molar amount. The molar amounts of the elements present are:.
the elements on the periodic table are arranged in order of increasing
Answer:
atomic number
Explanation: