30 points!!! please help chem question

Answer:

Yes

Explanation:

Because it was false because it has been the substance abuse permalink

Answer: The correct answer is B.

Explanation: The scientists and all test subjects involved in the investigation work for the company that sells the medication and  science product or similar is only considered as reliable if it has been tested following the scientific method and if there are not interests that can affect the process.

Answer:

a heterogeneous mixture

Explanation:

an example would be sand and water because it can be filtered which is a physical mean of separation.

Answer:

Heterogeneous mixtures

Explanation:

It is composed of two or more types of matter that can be present in varying amounts and can be separated by physical means. Heterogeneous mixtures vary in composition from point to point; homogeneous mixtures have the same composition from point to point.

Answer:

32

Explanation:

You have 7 valance electrons in fluorine, and you have 4 of them. 7*4=28. Then, you have 4 valance electrons on carbon. So 28+4=32

Answer:

magnesium oxide

Explanation:

hope this helps

Answer:

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

Explanation:

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

Explanation:

The atomic number is number on the right side

Answer:

During the process of reaching thermal equilibrium heat is transferred between the object. heat is always transferred from the object at the higher temperature to the object with lower temperature. For a gas, the heat transfer is related to a change in temperature.

Answer:

feel slippery

Explanation:they physical properties are due to its slippery nature when touched

Answer:

[tex]P=5.8x10^2kPa[/tex]

Explanation:

Hello.

In this case, since chlorine gas is assumed to behave ideally, we can use the ideal gas equation in order to compute the required pressure:

[tex]PV=nRT[/tex]

In such a way, since the temperature must be in kelvins and the volume in liters for the universal gas constant:

[tex]T=5+273.15=278.15K\\\\V=8dm^3*\frac{1L}{1dm^3}=8L[/tex]

Thus, we first compute the pressure in atm:

[tex]P=\frac{nRT}{V}= \frac{2mol*0.082\frac{atm*L}{mol*K}*278.15K}{8L}\\\\P=5.7atm[/tex]

Thus, the pressure in kPa turns out:

[tex]P=5.7atm*\frac{101.325kPa}{1atm}\\\\P=5.8x10^2kPa[/tex]

Answer:

I hope this answer is correct

Explanation:

This is an oxidation-reduction (redox) reaction:

Zn0 - 2 e- → ZnII (oxidation)

2 HI + 2 e- → 2 H0 (reduction)

Zn is a reducing agent, H2SO4 is an oxidizing agent.

Reactants:

Zn

Names: Zinc source: wikidata, accessed: 2019-09-07, Zinc powder (pyrophoric) source: ICSC, accessed: 2019-09-04, Zn source: wikidata, accessed: 2019-09-07

Appearance: Grey-to-blue powder source: ICSC, accessed: 2019-09-04

H2SO4 – Sulfuric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: NIOSH NPG, accessed: 2019-09-02

Other names: Oil of vitriol source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Sulfuric acid, concentrated (> 51% and < 100%) source: ICSC, accessed: 2019-09-04, H2SO4 source: wikidata, accessed: 2019-09-07

Appearance: Clear, colorless liquid source: wikipedia, accessed: 2019-09-27; Odourless colourless oily hygroscopic liquid source: ICSC, accessed: 2019-09-04; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02

Products:

ZnSO4 – Zinc sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04

Other names: White vitriol source: wikipedia, accessed: 2019-09-27, Goslarite source: wikipedia, accessed: 2019-09-27, Zinc sulfate (1:1) source: wikidata, accessed: 2019-09-02

Appearance: White powder source: wikipedia, accessed: 2019-09-27; Colourless hygroscopic crystals source: ICSC, accessed: 2019-09-04

H2

Names: Dihydrogen source: wikidata, accessed: 2019-09-07, Hydrogen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, H2 source: wikidata, accessed: 2019-09-07

Answer:

The water in the 75 mL beaker will cool down more rapidly then the water in the 500 mL beaker.

Explanation:

The scale of an object influences the object's properties. For example, the water in a small beaker loses heat more rapidly than the water in a large beaker. This is because heat loss decreases as volume increases. As the scale of a beaker increases, its volume increases. Therefore, the larger the beaker, the slower the water inside the beaker will cool.

Answer:

yaaaaa babdbabaaaa lolll

Explanation:

Answer:

Volume of hydrogen gas formed = 3.1 L

Explanation:

Given data:

Mass of magnesium = 3.00 g

Temperature = room = 27°C (27+273 = 300 K)

Pressure = 1 atm

Volume of hydrogen gas formed = ?

Solution:

Chemical equation:

Mg + H₂SO₄    →       MgSO₄ + H₂

Number of moles of Mg:

Number of moles = mass/molar mass

Number of moles = 3.00 g/ 24 g/mol

Number of moles = 0.125 mol

Now we will compare the moles Mg with hydrogen.

                    Mg             :             H₂

                     1                :              1

                   0.125          :          0.125

Volume of hydrogen:

PV = nRT

1 atm × V = 0.125 mol  ×  0.0821 atm.L /K.mol × 300 k

V = 3.1atm.L/1 atm

V = 3.1 L

Answer:11.35 g/cm 3

Explanation:

Length

= 2.0 dm = 20 cm

Breadth

= 8.0 cm

Height

= 35 mm = 3.5 cm

Volume of block

V = ℓ ⋅ b ⋅ h = 20 cm × 8.0 cm × 3.5 cm = 560 cm

3

Density of lead is

Density

=

Mass

Volume

=

6356 g

560 cm

3

=

11.35 g/cm

3

Explanation:

Answer:

We have the final answer as

[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]

Explanation:

To find the energy of a photon of this light we use the formula

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

f = 7.08×10¹⁴ Hz

We have

E = 7.08×10¹⁴ × 6.626 × 10-³⁴

We have the final answer as

[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]

Hope this helps you

Answer: B.

Explanation:

The nucleus is a membrane-enclosed organelle found in most eukaryotic cells. The nucleus is the largest organelle in the cell and contains most of the cell's genetic information (mitochondria also contain DNA, called mitochondrial DNA, but it makes up just a small percentage of the cell's overall DNA content).

Hope this helps!

Answer:

nuke-leus

Explanation:

Answer:

B

Explanation:

I studied this and had a test

Answer:

Explanation:

The given values are:

a= 6m/s²

u= 0 m/s

v = 30 m/s

t= ?

The formula is :

[tex]a=\frac{v-u}{t}[/tex]

thus,

[tex]t=\frac{v-u}{a}\\t=\frac{30-0}{6}\\t= 5 seconds[/tex]

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

The end of a chemical reaction is the product.

What is a chemical reaction?

A chemical reaction contains a reactant that reacts to form products. The reactant can be more than two, and the product can be two or more.

Food spoiling is a chemical reaction because it has an unpleasant odor, taste, and color change. Fruits undergo a chemical shift as they ripen. For instance, both the texture and color may change.

When we balance a chemical process, the number of moles or atoms on the left must match the amount on the right. Thus, the atoms participating in such a chemical process are discovered to have mass.

Chemical elements are uncontaminated by impurities or other elements and are pure substances made up of just one type of atom. They are found in the crust of the earth. Carbon, hydrogen, and oxygen are some examples.

Therefore, the end is the product.

To learn more about chemical reactions, refer to the below link:

https://brainly.com/question/22817140

#SPJ2

Answer:

To lower the activation energy of a reaction

Explanation:

i just took the test and got it right ...... i hope this helps :)

Answer:

Its either with itself to become fluoride Fl2 or with an alkali metal (elements in group 1) to achieve a stable electronic configuration or octet structure

Explanation:

Answer: the answer is Z

Explanation:

Becuase the order from smallest to largest would be:

Y: Cell

Z: Tissue

W: Organ

X: Organ system

Answer:

a

Explanation: