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2 years ago

What does a catalyst do?

Chemistry

1 answer:

Dmitrij [34]2 years ago

4 0

Answer:

D. Increases the reaction rate.

Explanation:

Catalysts increases the chemical reaction rate.

Hope this helps!

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Determine el porcentaje masa volumen de una solucion compuesta de 150g de etanol y 20g de agua cuyo volumen total es de 165ml

drek231 [11]

Answer:

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3 years ago

Which components make up bronfenbrenner's ecological theory?(choose every correct answer.)

kari74 [83]

Which components make up bronfenbrenner's ecological theory?

Bronfenbrenner divided the person's environment into ﬁve diﬀerent systems:

microsystem
mesosystem
exosystem
macrosystem
chronosystem.

What is bronfenbrenner's ecological theory?

Bronfenbrenner's ecological systems theory views child development as a complex system of relationships affected by multiple levels of the surrounding environment, from immediate settings of family and school to broad cultural values, laws, and customs.
To study a child's development then, we must look not only at the child and her immediate environment, but also at the interaction of the larger environment as well.
The microsystem is the most inﬂuential level of the ecological systems theory.
This is the most immediate environmental settings containing the developing child, such as family and school.
Bronfenbrenner's ecological systems theory has implications for educational practice.

To know more about bronfenbrenner's ecological theory, refer:

brainly.com/question/15462995

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7 0

1 year ago

What are the mole fraction and the mass percent of a solution made by dissolving 0.21 g KBr in 0.355 L water? (d = 1.00 g/mL.) m

IRISSAK [1]

Answer:

Mol fraction H2O = 0.99991

Mol fraction KBr = 0.00009

mass % KBr = 0.059 %

mass % H2O = 99.941 %

Explanation:

Step 1: Data given

Mass of KBr = 0.21 grams

Molar mass KBr = 119 g/mol

Volume of water = 355 mL

Density of water = 1.00 g/mL

Molar mass water = 18.02 g/mol

Step 2: Calculate mass water

Mass water = 355 mL * 1g /mL

Mass water = 355 grams

Step 3: Calculate moles water

Moles water = mass water / molar mass water

Moles water = 355 grams / 18.02 g/mol

Moles water = 19.7 moles

Step 4: Calculate moles KBr

Moles KBr = 0.21 grams / 119 g/mol

Moles KBr = 0.00176 moles

Step 5: Calculate total moles

Total moles = 19.7 moles + 0.00176 moles

Total moles = 19.70176 moles

Step 6: Calculate mol fraction

Mol fraction H2O = 19.7 moles / 19.70176 moles

Mol fraction H2O = 0.99991

Step 7: Calculate mol fraction KBr

Mol fraction KBr = 0.00176 / 19.70176

Mol fraction KBr = 0.00009

Step 6: Calculate mass %

mass % KBR = (0.21 grams / (0.21 + 355) grams) *100%

mass % KBr = 0.059 %

mass % H2O = (355 grams / 355.21 grams) *100%

mass % H2O = 99.941 %

8 0

3 years ago

hat range, give the lower value and the higher value, respectively, for the following. (a) How many cubic meters of water are in

torisob [31]

Answer:

a) 9424797000 m3

b) 9424797000000 liters

c) 9424797000000 kg

Explanation

Cylinder has a radius of 1 km= 1000 m.

Area Cylinder = π r^2 = 3,141599* (1000m)^2 = 3141599 m2

a) Volume Cylinder= area x Height=3141599 m2* 3000 m= 9424797000 m3

b) 1000 liters= 1m3, 9424797000 * 1000 = 9424797000000 liters

c) densiy = 1000 kg/m3, or 1 kg/ liter, mass= 9424797000 lt * 1kg/lt =

9424797000 kg

5 0

3 years ago

WHAT IS NOT A LIVING PART OF AN ECOSYSTEM<br> .FUNGUS<br> .SUN<br> .TREE<br> .BUG

UkoKoshka [18]

The sun is your answer

8 0

4 years ago

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