Could someone plz help me? :(

Answer:

Mass is a measure of the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g). To measure mass, you would use a balance.

The density of a substance can be defined as the mass of the subtance per unit volume of the substance. Mathematically, the density of a substance can be expressed as:

[tex]Density = \frac{Mass}{Volume }[/tex]

With the above information in mind, we can obtain the volume of the substance given in the question above as illustrated below:

Density = 3.89 g/mL

Mass = 2.58 g

[tex]Density = \frac{Mass}{Volume} \\\\3.89 = \frac{2.58}{Volume }[/tex]

Cross multiply

3.89 × Volume = 2.58

Divide both side by 3.89

[tex]Volume = \frac{2.58}{3.89}\\\\[/tex]

Therefore, the volume of the substance is 0.66 mL

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Answer:

true

Explanation:

you can't change it back, it's chemically changed

Answer:

it contains most of the mass

The dependent variable is the heart rate of daphnia, a small crustacean.

WHAT IS INDEPENDENT AND DEPENDENT VARIABLES?

In an experiment, two variables are important. These two variables are the independent variable and dependent variable.

Therefore, the dependent variable is the heart rate of daphnia, a small crustacean.

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Answer:

Explanation: Rinsing hands in lemon juice would make them less slick because when a acid (soap) and a alkaline (lemon juice) reacts it becomes neutral

Answer: C

Explanation: I believe it's C because I know A, B, and D are 100% correct

and if you look at solids, there pact together, pact together mean it cant move.

nail polish remover float

Answer:

it will float on water

explanation:

Geekette hypothesized that since it floated on the water, like ice does, it must be less dense. ... According to Ken Johnsen, who lists his expertise in chemistry, the components of nail polish indeed make it less dense than water

Answer:

Increasing soil protection by crop residues and plants; adding organic matter to the soil through crop rotations, manures, or crop residues; and careful management of fertilizers, pesticides, tillage equipment, and other elements of the farming system can improve soil quality.

Answer:

Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase. ... This is because the pressure of their triple point is very high and it is difficult to obtain them as liquids.

The molecular geometry is square planar.

According to the Valence Shell Electron Pair Repulsion theory (VSEPR), the shape of a molecule is determined by the number of valence electrons surrounding the outermost shell of the central atom in the molecule.

In this case, the expected geometry based on VSEPR theory is octahedral. However, the lone pairs on opposite sides of the four single bonds leads to a square planar molecular geometry.

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Answer:

decrease

Explanation:

ladybirds eat aphids so more ladybirds = more aphids eaten = less aphids

Answer:

D. A triple beam balance is used to measure the weight of an object, and a spring scale is used to measure the mass of an object.

Explanation:

:)

Answer: The right answer is C!

Explanation: This is 100% right hope its helps! :-D

Answer:

Kinetic energy is motion; it is the motion of waves, electrons, atoms, molecules, substances, and objects. Electrical energy is the movement of electrons.

Explanation:

Mark me as the brainliest

Answer:

La electricidad es una forma de energía que se manifiesta con el movimiento de los electrones de la capa externa de los átomos que hay en la superficie de un material conductor. La electricidad es un fenómeno íntimamente ligado en la materia y a la vida.

Explanation:

dame  coronar

Answer:

Explanation:

It's water vapor. There is enough heat present to get the water to boil but not enough to break it into its chemical components (oxygen and hydrogen), so the answer is D.

The composition of 925 Sterling Silver lends itself to the occasional green discoloration because of the presence of copper

Answer:

I think some important qualities for a scientist to have is to be hard working, clever, and be able to manage your time and projects well. When you’re a scientist, you are going to be in a lab or in the field a lot. You need to be clever to carefully write down things that are important and interesting. You're also going to have to be hard working as well because as a scientist, it is important to work hard and get sound results.

I think one of the qualities that shows in my schoolwork is hard work. I always do my best on my assignments. I constantly work to get ahead and finish my work on time. The harder I work, the less work I have to do. Since I keep myself busy, I make myself less busy.

Explanation:

yep

Answer:

They are named as such because the fuel is ignited in order to do work inside the engine. ... The same fuel and air mixture is then emitted as exhaust. This can be done using a piston (called a reciprocating engine), or with a turbine.

Answer:

hypothesis = A tentative explanation for a question, testable through experiments.

theory = An explanation supported by many experiments, answers "why".

law = A relationship in nature supported by many experiments.

Explanation:

Answer:

false it has a green glow to it

Answer:

1,380 °C hope this is the right answer

[tex]\boxed{\sf \Delta T_f=K_fm\times i}[/tex]

For K_3 PO_4

It shall release 3K+ and PO_4- ions

Now

[tex]\\ \rm\Rrightarrow \Delta T_f=1.56(4)(1.86)[/tex]

[tex]\\ \rm\Rrightarrow \Delta T_f=11.6°C[/tex]

It can be freezed easily at room temperature in UK or Siberia

Answer:

When boiling a substance, the particles obtain more kinetic and potential energy from the heat being delivered. The kinetic energy means that the particles starts moving more intensely, and the potential energy means that the particles start to move away further from each other, which means the substance expands in volume.

Explanation:

When a liquid is heated, the particles gain energy and begin to move faster and faster, expanding the liquid. As the liquid warms, the most energetic particles at the surface escape as vapor from the surface.

A particle is a small localized object to which several physical or chemical properties, such as volume, density, or mass, can be assigned in the physical sciences.

Atoms are small units of matter that contain a number of particles known as subatomic particles. The term particle, on the other hand, refers to any small object.

As a result, the primary distinction between atoms and particles is that atoms are small units composed of multiple particles, whereas particles are minute portions of matter.

When a fluid is subjected to heat, the particles acquire energy and start moving extremely fast, causing the liquid to expand.

The much more energetic particles at the exterior getaway as vapor phase from the surface as the liquid warms.

Thus, the arrangement and movement of the particles gets disturbed when a substance is boiled, and it gets escaped as vapor.

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#SPJ2

Answer:

Only 2

Explanation:

Answer:

Calculator

Explanation:

A calculator is used to make, well calculations

You can use a scale to get information about the weight of an object, and you can observe how weight changes in relation to size etc.

For obvious reasons, you can observe different scents

Again a microscope is an observational tool

Answer:

a molecule of an element is called atomicity

Answer:

Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world.

Answer:

A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons -or electrostatic forces.

Answer:

science needs both ideas the hypothesis and facts the quantitative results to move forward

Explanation:

the two primary features of a scientific hypothesis are falsifiability and testability which are reflected in an If…then statement summarizing the idea and in the ability to be supported or refuted through observation and experimentation

1 mole of water = 18g

6 moles of water = 18×6 = 108 g

Answer: I'm pretty sure the action is Jerod swinging the golf club and the reaction is hitting the ball

Explanation: