which ones is right i need help

Answer:

24+24=48

Explanation:

Which sources of error could cause you to draw an incorrect conclusion to an experiment? Select all that apply.

1: testing too many times

2: not testing enough times

3: testing more than one variable

4: human error

I NEED HELP ASAP!!!
A sample of ice undergoes a physical change by being melted in a beaker. The ice cube had a mass of 30 grams. What will be the mass of the liquid water? How did you determine this?

Experiment Scenario: Taylor is testing three brands of fertilizer to see which produces the best plant growth. The amount of water given to each plant will remain the same. He plans to use only one type of plant as well.

Questions: Taylor's measurement of the plant height will be his WHAT variable. The amount of water he waters the plants with will be one of his WHAT variables. The three brands of fertilizer he uses will be his WHAT variable.

In a ___________ reaction, an acid and a base produce a salt and a water.
a. Decomposition
b. Neutralization
c. Synthesis
d. Concentrated

Where does energy for all living things come from FIRST

at least two examples
of Chemical Formula

Write a summary of some key ideas about chemical reactions.
Please!
I have to pass science to be able to get my nails done professionally!!!
I WILL MARK BRAINLIEST!!!!

Which statement explains the difference in chloroplasts between the two types of plant cells?
A.
The leaf cells have larger chloroplasts because leaf cells need more support and a stronger structure.
B.
The root cells have smaller chloroplasts because root cells do not need to store food and water.
C.
Unlike the leaf cells, the root cells have no chloroplasts because root cells do not need to produce or use energy.
D.
Unlike the root cells, the leaf cells have many chloroplasts because leaf cells produce sugars for the plant.

In a __________________ reaction, elements are not changed, just rearranged. Small amounts of energy take place.
a. Endothermic
b. Exothermic
c. Nuclear
d. Chemical

Why does the sun appear to be the brightest star in the sky?
A. It burns more gas, making it brighter than any other star.
B. It is the largest star in the galaxy, so it is the brightest star
C .Its relative distance to Earth is closer than the other stars.

Which option correctly identifies the pure substance or substances? a. diamond b. salt

A. a
B. a and b
C. b and c
D. all of them

the atomic number of an element is the number of ______ or ______ contained in the element.

Help pls What is the name of the atom shown

Please help me out with this stuff please

The Brahman cattle have good resistance to high temperature, but its meat is poor and tough to eat. The English shorthorn cattle, on the other hand, have good meat, but poor resistance to high temperatures. Farmers formed the Santa Gertrudis cattle by breeding Brahmans with English shorthorns. This new type of cattle has good meat and resistance to high temperatures. Which of the following best describes the process used to produce the Santa Gertrudis cattle?

A.
genetic engineering

B.
inbreeding

C.
natural selection

D.
selective breeding

Which of the following would most likely form an ionic bond?

A) Br and Cl

B) O and Cl

C) H and Cl

D) Na and Cl

plz help on last question i asked

Help PLEASE!! Will mark brainly Calculate the total energy in 1.5 x 10^13 photons of gamma radiation having wavelength = 3.0 x 10^-12 m. Need to show ALL work.

The bobsled is an event in the winter Olympics. In this event, each sled and its riders speed down an icy track. Which factor(s) affect how much kinetic energy the sled and its team have when the sled crosses the finish line?
A mass only
B speed and time
C speed and mass
D speed, mass, and time

Please helppp with this question

Worksheet: Balancing Equations
I. Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3


2. C3H8 + O2 CO2 + H2O


3. P4 + O2 P2O3




4. KNO3 KNO2 + O2


5. O2 + CS2 CO2 + SO2


6. KClO3 KCl + O2


7. N2 + H2 NH3


8. NaF + Br2 NaBr + F2


9. Al + HCl H +AlCl3


10. WO3 + H2 W + H2O

Select the correct scientific notation form of this numeral using only 3 significant figures. 8,468 L

A squirrel and an oak tree are both examples of individual:
Genes
Organism
Cells
Ecosystems
Other:

Definition: The different layers of gases that extend from the surface of the Earth into space.
Example: troposphere, stratosphere, mesosphere, thermosphere
Term: Type term here
(SC.6.E.7.1.) Radiation

According to the video, what qualities do Chemists need? Check all that apply. curiosity ability to focus on details ability to lift heavy objects negotiation skills friendly attitude painstaking follow-through

10g of water will freeze at "32c" what temperature would 20g of water freeze

Why do you think the Na+ ion is smaller than a neutral Na atom? Why do you think the Cl - ion is larger than a neutral Cl atom?

What elements are represented by the chemical NaHCO2 formula?
A. nitrogen, helium, carbon, oxygen
B. nitrogen, helium, cobalt
C. sodium, hydrogen, cobalt
D. sodium, hydrogen, carbon, oxygen

PLEASE HELPP

A student fills four containers with 20 ml of water and places them in four different locations.
One is placed in a sunny window, one is placed underneath a heat lamp, one is placed on a
student desk, and another is placed in a dark cabinet. The student plans to collect evaporation
data over a period of one week. Which prediction will best match the actual results?

What greatly affects how scientists (and you) look at and interpret evidence?

You carry a 50-N weight up a flight of stairs that is 3 m high in 10 s. then you carry 40 N up two flights of stairs in 20 s. Finally, you carry 30 N up three flights in 45 s. Is the job that took the most power the same as the job that took the most energy? Explain.